US20090297360A1 - Breeze Enhancing Fan Blade Attachment - Google Patents

Breeze Enhancing Fan Blade Attachment Download PDF

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Publication number
US20090297360A1
US20090297360A1 US12/132,223 US13222308A US2009297360A1 US 20090297360 A1 US20090297360 A1 US 20090297360A1 US 13222308 A US13222308 A US 13222308A US 2009297360 A1 US2009297360 A1 US 2009297360A1
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United States
Prior art keywords
fan blade
ceiling fan
attachment
blade attachment
proximal end
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/132,223
Inventor
Richard De Rosa
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to US12/132,223 priority Critical patent/US20090297360A1/en
Priority to PCT/US2009/045657 priority patent/WO2009148953A1/en
Publication of US20090297360A1 publication Critical patent/US20090297360A1/en
Abandoned legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/08Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/088Ceiling fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38Blades
    • F04D29/384Blades characterised by form

Definitions

  • the present invention generally relates to fan blades, more specifically, the present invention relates to new and useful high performance fan blade attachments and/or add-on accessories for existing ceiling fan blades.
  • Overhead ceiling fans have been used for many years in order to assist with air movement within rooms.
  • Traditional blades have usually focused on flat planar rectangular type shapes. See U.S. Pat. No. Des. 355,027 to Young and U.S. Pat. No. Des. 382,636 to Yang. Both respective patents utilize technology similar to that from the turn of the century, namely flat planar type blades.
  • well known problems exist with such traditional flat planar rectangular ceiling fan blades.
  • Traditional blades may be noisy at high speeds and may be prone to vibration and wobbling during use.
  • Aircraft, boat, and automobile engine propeller blades have been altered over time to other shapes besides planar rectangles. See for example, U.S. Pat. No. 4,411,598 to Okada; U.S. Pat. No. 4,730,985 to Rothman et al.; U.S. Pat. No. 4,794,633 to Hickey; U.S. Pat. No. 5,114,313 to Vorus; and U.S. Pat. No. 5,253,979 to Fradenburgh et al.
  • RPM revolutions per minute
  • None of these automobile, aircraft, and boat propellers is designed for optimum airflow at low speeds of approximately 50 RPM to approximately 200 RPM, which is the approximate RPM typically used for overhead ceiling fans.
  • twist blades Conventional manufacturing methods for producing twist blades can be very expensive. As a result, designers and manufacturers often provide non-twisted blades with their ceiling fans in order to create a more cost effective product from the seller's perspective. Consequently, it is desirable to combine the beneficial performance aspects of the twisted blades with the economics of the uniform conventional blades to achieve a high performance blade attachment or add-on accessory for conventional planar ceiling fan blades at a relatively low cost to the user.
  • the present invention combines a unique simplicity of form with great effectiveness, safety, and ease of use.
  • the fan blade attachment's aerodynamic design and positioning on the rotating blades of a conventional fan enable a preexisting ceiling fan to move a much greater volume of air, thus eliminating the need to increase the rotational speed of the fan. This results in the saving of electrical energy that would otherwise be consumed if the same air turbulence were to be achieved without use of the present inventive fan blade attachments or add-on accessories.
  • the present inventive concept allows users to simply secure the fan blade attachments directly onto preexisting conventional fan blades. This may be done quickly and easily without the use of sophisticated tools, hardware, or the needlessly complicated and cumbersome secondary or tertiary gadgets of previous inventions.
  • a ceiling fan blade attachment for enhancing the efficiency of a ceiling fan blade with the ceiling fan blade having a leading edge and a trailing edge
  • the ceiling fan blade attachment comprising a deflection element having a positive twist adjacent a proximal end of the ceiling fan blade attachment, so that pitch of the ceiling fan blade attachment decreases from the proximal end of the ceiling fan blade attachment to the distal end of the ceiling fan blade attachment; and at least one fixation member for securing the deflection surface to the ceiling fan blade.
  • the present invention provides aftermarket ceiling fan blade attachments that are aerodynamically optimized to move approximately 40% or more air than traditional planar ceiling fan blades.
  • the present inventive fan blade attachments provide ceiling fan blades that are quieter and provide greater comfort than traditional planar ceiling fan blades. Such an efficient design may further reduce the tendency of traditional planar ceiling fan blades to wobble during use. With the movement of a larger air volume with less input, the present invention provides for reduced electrical power consumption and is more energy efficient than traditional planar ceiling fan blades.
  • the present invention allows for the use of an aftermarket fan blade attachments that generate superior airflow when attached to conventional ceiling fan blades which typically revolve at approximately fifty to two hundred revolutions per minute.
  • FIG. 1 depicts a side view of an embodiment of the ceiling fan blade attachments of the present invention.
  • FIG. 2 depicts a perspective view of an embodiment of a ceiling fan blade attachment of the present invention.
  • FIG. 3 depicts a side view of an embodiment of a ceiling fan blade attachment of the present invention to illustrate the twist of the ceiling fan blade attachments of the present invention.
  • FIGS. 4A-4B depict side views of two embodiments of ceiling fan blade attachments of the present invention.
  • FIG. 5A depicts a planar top view of an embodiment of a unitary fan blade attachment blank of the present invention prior to bending and manipulation.
  • FIG. 5B depicts a perspective view of an embodiment of a unitary fan blade attachment blank of the present invention after formation of at least one fixation member.
  • FIG. 5C depicts a front view of an embodiment of a unitary fan blade attachment blank of the present invention after formation of both at least one fixation member and a positive blade twist.
  • the present invention provides for ceiling fan blade attachments for enhancing the breeze generated by conventional existing ceiling fan blades.
  • the present invention allows a user to improve fan efficiency by modifying their existing fan blades without having to incur the high costs of complete fan replacement.
  • the present invention enables the curvature of, preferably, a trailing edge of a conventional planar fan blade to be enhanced and/or extended (see FIG. 1 ), thereby permitting the existing blade to perform more work by moving more air.
  • the present invention provides for an inexpensive and simple means for reducing the noise associated with existing fan blades while at the same time maintaining fan work efficiency.
  • FIG. 1 depicts ceiling fan blade attachments 100 of the present invention secured to conventional planar ceiling fan blades 200 , wherein the ceiling fan blades 200 have both a leading edge 210 and a trailing edge 220 .
  • a deflection element 10 of the ceiling fan blade attachment 100 may be secured to the ceiling fan blade 200 via at least one fixation member 15 .
  • a fan motor unit may be disposed immediately adjacent both a proximal end 20 of the ceiling fan blade attachment 100 and a proximal end of the ceiling fan blade 200 wherein a distal end 25 of the ceiling fan blade attachment 100 and a distal end of the ceiling fan blade 200 are disposed radially outward therefrom.
  • the fan blade attachments 100 of the present invention allow for maximizing the air flow of existing ceiling fans having blade sweeps up to and beyond approximately 64 inches, with the ceiling fan blade attachments 100 shaped to maximize downward air flow at revolutions per minute (RPM) of up to approximately 200 RPM.
  • RPM revolutions per minute
  • the fan blade attachments 100 of the present invention may be constructed of the same material as the existing fan blades 200 or the fan blade attachments 100 may be made of a different and/or more economical material.
  • Materials of construction may comprise any materials known within the art including but not limited to plastics such as acrylonitrile butadiene styrene (ABS), extruded plastics such as nylon, resin reinforced plastic, fiberglass, wood, metal, extruded metal such as aluminum, expanded fluorocarbons, and/or other materials as desired.
  • ABS acrylonitrile butadiene styrene
  • Fan blade attachments 100 composed of lighter material will exert less stress on the fan motor than blade attachments 100 made from material of heavier weight and denser mass.
  • Such fan blade attachments 100 may be virtually noiseless, allow for a greater cubic feet per minute (CFM) output, and provide monetary savings via energy conservation.
  • the fan blade attachments 100 of the present invention may be of molded or extruded construction if so desired.
  • the highly functional design and effective simplicity of this invention make it possible to reduce its production costs and subsequently relay a predictably lower price to consumers than other previously proposed heavier and complex supplementary ceiling fan blade assemblies.
  • the elements of a present inventive fan blade attachment 100 may comprise one or more pieces.
  • the deflection element 10 and the at least one fixation member 15 of the present invention may comprise a unitary structure for purposes of streamlining, simplifying, and reducing costs related to the manufacturing process.
  • use of two or more distinct pieces and/or materials may be necessary for performance optimization of the present invention.
  • each such piece may, after being installed, either permanently or removably affix the fan blade attachment 100 to the fan blade 200 thereby forming a highly efficient functional surface.
  • the permanent or removable connections may comprise at least one fixation member 15 .
  • the at least one fixation member 15 is connected to the trailing edge 220 of an existing fan blade 200 , but the scope of the present invention includes at least one fixation member 15 disposed about the trailing edge 220 , the leading edge 210 , the proximal end, and/or the distal end of an existing fan blade, and any combinations thereof.
  • the at least one fixation member 15 may comprise any fixation members known within the art including but not limited to resilient clips, screw attachments, hook and loop fasteners, adhesive strips, bonding, gluing, riveting, bolting, welding or any other suitable fixing method for securing a fan blade attachment 100 to an existing fan blade 200 .
  • the at least one fixation member 15 as being at least one resilient clip capable of forming a removable yet firm friction fit connection between the fan blade attachment 100 and an existing fan blade 200 .
  • Depiction of only a resilient clip embodiment of the at least one fixation member 15 within the Figures is only meant to assist in comprehension of the present invention and is not limiting as to the scope of other embodiments of the at least one fixation member 15 and any legal equivalents thereof.
  • the ceiling fan blade attachment 100 of the present invention may be disposed along the trailing edge 220 of the existing fan blade 200 and it is preferable, but not required, for the fan blade attachment 100 to extend along the entire length of the trailing edge 220 . It is also preferable, but not required, for the fan blade attachment 100 to have a constant or uniform width in order to provide a uniform improved deflection surface 10 in addition to providing an efficient positive twist of a fan blade attachment 100 of the present invention.
  • a cross section of the deflection element 10 may comprise a variety of configurations including but not limited to a deflection element 10 of constant or uniform depth and/or a deflection element 10 of a tapered depth such as that of a conventional aircraft wing.
  • the fan blade attachment 100 may be disposed along at least half the length of the existing fan blade 200 .
  • the fan blade attachment 100 may still comprise a positive twist at its proximal end 20 and reduce its pitch as it approaches its distal end 25 at the approximate midpoint of or further down the length of the existing fan blade 200 . In this manner, total surface area and material costs for manufacturing the fan blade attachment 100 may be reduced while still providing an efficiency improving positive twist at the proximal end 230 of an existing fan blade 200 .
  • FIGS. 2 and 3 depict a perspective view and a side view, respectively, of a single fan blade attachment 100 of the embodiment of FIG. 1 , showing the single fan blade attachment 100 having a deflection element 10 between a proximal end 20 and a distal end 25 , and various reference cross-sections therebetween.
  • a positive twist or pitch angle decreases along the rotational plane of the fan blade attachment 100 from its proximal end 20 to its distal end 25 .
  • the fan blade attachment 100 is positioned in a selected position as depicted in FIG. 1 by at least one fixation member 15 .
  • the proximal end 20 of the fan blade attachment 100 When held in position, the proximal end 20 of the fan blade attachment 100 may be disposed at a first pitch angle 30 of between approximately 20 degrees to approximately 35 degrees from a horizontal plane H that is parallel to a ceiling (see FIG. 3 ).
  • the distal end 25 of the fan blade attachment 100 may have a second pitch angle 35 of between approximately 5 degrees to approximately 16 degrees from the horizontal plane H.
  • the mid cross-sectional areas therebetween have varying angles of twist between the proximal end 20 and the distal end 25 of the fan blade attachment 100 .
  • the deflection member 10 comprises an efficient positive twist configuration.
  • the positive twist, or pitch of the ceiling fan blade attachment 100 increases from the distal end 25 of the ceiling fan blade attachment 100 to the proximal end 20 .
  • Such a positive twist maximizes air flow along the entire length of the blade 200 , including the proximal end of the fan blade 200 where inefficiencies are very common in the art.
  • the proximal end 20 of the fan blade attachment 100 is pitched at a higher angle than the distal end 25 .
  • the lower angular velocity present on axial fans near the center of the fan i.e. proximal region
  • use of the present inventive fan blade attachments 100 may provide a first pitch angle 30 of approximately 20 degrees to approximately 35 degrees from the horizontal plane H at the proximal end 20 of the blade attachment 100 .
  • the positive twist or pitch angle decreases toward the distal end 25 of the blade attachment 100 thereby providing greater air flow than existing planar ceiling fan blades 200 .
  • the distal end 25 of the present inventive device may comprise a second pitch angle 35 of approximately 5 degrees to approximately 16 degrees from the horizontal plane H.
  • the blade attachments 100 may generally include a concave raised bottom and a flat or convex shaped upper surface.
  • the blade attachments 100 may be mounted to existing ceiling fan blades to provide enhanced airflow at speeds of up to approximately 200 RPM.
  • the novel ceiling fan blade attachments 100 may be manufactured to accommodate all sizes of existing fan blades 200 including but not limited to fan blade sweeps of up to and beyond approximately 64 inches.
  • Conventional existing ceiling fan blades 200 are planar (i.e. no twist) and commonly disposed at a third pitch angle 40 (see FIG. 3 ) of between approximately 8 degrees to approximately 16 degrees. Any deflection element 10 of a fan blade attachment 100 extrapolating the plane of an existing planar fan blade 200 would inherently be disposed at the third pitch angle 40 relative to the horizontal plane H.
  • the sum of the third pitch angle 40 and an angle from which the deflection element 10 deviates from the existing fan blade 200 plane is equivalent to the first pitch angle 30 at the proximal end 20 of the fan blade attachment 100 and is equivalent to the second pitch angle 35 at the distal end 25 of the fan blade attachment 100 .
  • respective fan blade attachments 100 of the present invention may be manufactured in a variety of angles to complement all configurations of existing planar fan blades 200 and the inherent third pitch angles 40 thereof.
  • the goal of the present invention is to provide a fan blade attachment 100 for an existing planar fan blade 200 which will combine to provide both a first pitch angle 30 of between approximately 20 degrees to 35 degrees and a second pitch angle 35 of between approximately 5 degrees to 16 degrees relative to the horizontal plane H.
  • FIGS. 4A-4B depict further embodiments of the present inventive fan blade attachment 100 .
  • the width of the fan blade attachment 100 is preferably less than the width of the existing planar fan blade 200 .
  • a fan blade attachment 100 width of approximately 2 inches may be preferred, but is by no means limiting as to the scope of the width of other fan blade attachment 100 embodiments.
  • FIG. 4A depicts a preferred embodiment wherein the deflection element 10 of a fan blade attachment 100 is disposed along the trailing edge 220 of an existing planar fan blade 200 .
  • the second pitch angle 35 may be greater than or equal to the third pitch angle 40 (see FIG. 3 generally).
  • a second embodiment may comprise the deflection element 10 being disposed further up the existing planar fan blade 200 toward its leading edge 210 .
  • the distal end 25 of the fan blade attachment 100 may extrapolate the plane within which the existing fan blade 200 is disposed (third pitch angle 40 ).
  • Another embodiment of a fan blade attachment 100 may have a width approximately equal to one half of the width of the existing fan blade 200 .
  • Such a configuration may provide a greater surface area for the deflection element 10 but also increases the drag resistance against the ceiling fan motor (see FIG. 1 ).
  • FIG. 4B depicts an embodiment of a fan blade attachment 100 having a width approximately equal to the width of the existing fan blade 200 . In such a configuration, the surface area of the fan blade attachment 100 may effectively replace the functional deflecting surface of the existing fan blade 200 .
  • a positive twist of the deflection element 10 is thereby disposed from the leading edge 210 of the fan blade 200 to the trailing edge 220 of the fan blade 200 .
  • a fan blade attachment 100 comprising lightweight material is highly preferred.
  • the fan blade attachment 100 may be secured via at least one fixation member 15 disposed about the leading edge 210 , the trailing edge 220 , the proximal edge 230 , or the distal edge 240 of the existing fan blade 200 , and/or any combinations thereof.
  • FIGS. 5A-5C depict a preferred embodiment of the fan blade attachments 100 of the present invention as well as a preferred embodiment of its method of manufacture.
  • FIG. 5A depicts a planar unitary fan blade attachment blank 300 prior to any manipulation during the manufacturing process.
  • a preferred material for the fan blade attachment blank 300 is ABS plastic.
  • the depicted fan blade attachment blank 300 is shown having a rectangular deflection element 310 and three fixation members 315 , however, the illustration of such a preferred embodiment is not meant to limit or restrict the scope of the present invention.
  • the deflection element 310 may be approximately two inches in width but the present invention includes any and all deflection element 310 widths associated with fan blade attachments conforming to the appended claims.
  • FIG. 1 depicts a planar unitary fan blade attachment blank 300 prior to any manipulation during the manufacturing process.
  • a preferred material for the fan blade attachment blank 300 is ABS plastic.
  • the depicted fan blade attachment blank 300 is shown having a rectangular deflection element 310 and three fixation members 3
  • FIG. 5B depicts the fan blade attachment blank 300 after the ABS material of the three fixation members 315 has been bent and manipulated into respective unitary clip configurations providing for a resilient friction fit over an edge (preferably the trailing edge 220 ) of an existing fan blade 200 .
  • the present invention may further comprise at least one securement aperture 316 through which a screw of other fastener known within the art may pass to provide a greater connection between the fan blade attachment blank 300 and an existing fan blade 200 .
  • Such a securement aperture 316 may allow for retention of the fan blade attachment blank 300 up to and beyond the highest anticipated fan blade speeds of approximately 200 RPM.
  • One or more securement apertures 316 may be disposed in one or more of the fixation members 315 .
  • FIG. 5C depicts the final configuration of a preferred fan blade attachment blank 300 of the present invention wherein a positive twist has been incorporated into the deflection element 310 .
  • the pitch of the deflection element 310 may have its greatest value at the proximal end 320 of the fan blade attachment blank 300 and its lowest value at the distal end 325 of the fan blade attachment blank 300 .
  • FIG. 5C also shows the incorporation of at least one securement aperture 316 disposed through at least one fixation member 315 .
  • the fan blade attachments 100 of the present invention may further comprise any and all decorative and design surfaces known within the art.
  • a user may understandably desire an efficient fan blade attachment 100 of the present invention to match and/or coordinate with the color or design of their existing fan blades 200 .
  • the fan blade attachments 100 of the present invention may visually display an aesthetic surface image including but not limited to solid colors, patterns, designs, wood grains, wood finishes, transparent material, and the like. Such alternate aesthetic design embodiments may provide a consumer with additional decorating or design options and thus serve to increase the overall desirability of the present inventive device.
  • the present invention provides fan blade attachments 100 for existing planar fan blades 200 which dramatically improve the work efficiency of preexisting ceiling fans. Use of the present invention will lower monthly electric bills and allow for an equivalent amount of work to be done by a fan set at a lower speed.
  • a preferred embodiment of the present invention includes fan blade attachments 100 secured to the trailing edges 220 of existing planar fan blades 200 , wherein the pitch of the blade attachment 100 increases from its distal end 25 to its proximal end 20 , wherein the existing fan blade 200 is operated within speed ranges of approximately 50 RPM to approximately 200 RPM, and provides for substantial energy savings and increased air flow as compared to conventional planar ceiling fan blades 200 .

Abstract

A ceiling fan blade attachment for enhancing the efficiency of conventional planar ceiling fan blades. A deflection element of the fan blade attachment may improve, add to, and/or replace the functional surface area of a conventional fan blade. The deflection element of the fan blade attachment comprises a positive twist spanning from the proximal end of the ceiling fan blade to either at least the approximate midpoint of the ceiling fan blade or the distal end of the ceiling fan blade. Preferably, the pitch of the fan blade attachment at its proximal end may be between 20 degrees to 35 degrees relative to a horizontal plane and the pitch of the fan blade attachment at its distal end may be between 5 degrees and 16 degrees relative to the horizontal plane. At least one fixation member may provide for securing the deflection element to the ceiling fan blade.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • Not applicable.
  • STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • Not applicable.
  • INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISK
  • Not applicable.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention generally relates to fan blades, more specifically, the present invention relates to new and useful high performance fan blade attachments and/or add-on accessories for existing ceiling fan blades.
  • 2. Background Art
  • Overhead ceiling fans have been used for many years in order to assist with air movement within rooms. Traditional blades have usually focused on flat planar rectangular type shapes. See U.S. Pat. No. Des. 355,027 to Young and U.S. Pat. No. Des. 382,636 to Yang. Both respective patents utilize technology similar to that from the turn of the century, namely flat planar type blades. Furthermore, well known problems exist with such traditional flat planar rectangular ceiling fan blades. Traditional blades may be noisy at high speeds and may be prone to vibration and wobbling during use.
  • Aircraft, boat, and automobile engine propeller blades have been altered over time to other shapes besides planar rectangles. See for example, U.S. Pat. No. 4,411,598 to Okada; U.S. Pat. No. 4,730,985 to Rothman et al.; U.S. Pat. No. 4,794,633 to Hickey; U.S. Pat. No. 5,114,313 to Vorus; and U.S. Pat. No. 5,253,979 to Fradenburgh et al. However, all of these patents are used for high speed water, aircraft, and automobile engine applications where the propellers are run at high revolutions per minute (RPM), generally in excess of 500 RPM. None of these automobile, aircraft, and boat propellers is designed for optimum airflow at low speeds of approximately 50 RPM to approximately 200 RPM, which is the approximate RPM typically used for overhead ceiling fans.
  • Some alternative shapes have been proposed for ceiling fan blades. See U.S. Pat. No. 4,892,460 to Volk. However, the Volk patent while claiming to be “aerodynamically designed” requires a curved piece to be attached by a groove to the side of a conventional planar rectangular blade. The grooved connection point in the Volk device would appear to be susceptible to separation and cause a hazard to anyone or any property located beneath the ceiling fan. Such a configured device may also possess less than optimal aerodynamic characteristics as well.
  • It is known that a blade having a “twist” thereto provides more lift (and hence an increase in the displacement of air) than blades which are not so “twisted” or are uniform and consistent along their length. Extensive research regarding the known benefits of such a design configuration is disclosed in U.S. Pat. No. 6,039,541 to Parker et al.; U.S. Pat. No. 6,659,721 to Parker et al.; U.S. Pat. No. 6,884,034 to Parker et al.; and U.S. Pat. No. 7,210,910 to Parker et al., wherein all such disclosures are hereby incorporated by reference in their entireties.
  • One attempt to achieve the same effect as a twisted blade is disclosed in U.S. Pat. No. 4,618,313 to Mosiewicz. This patent discloses an axial propeller blade comprising a single tab secured along its trailing edge. This single tab is also disclosed as being inclined from the blade at an angle of from 10 degrees to 70 degrees so as to enhance the lift of the blade. However, the tab of Mosiewicz is planar and of a uniform or consistent configuration. Consequently, there is no possibility of this tab having one configuration and/or angle at the root end of the blade and another configuration and/or angle at the tip end of the blade so as to be more consistent with twisted fan blades. There is also no likelihood of this tab conforming to the multiple planes normally found in twisted fan blades which cause or result in increased performance and efficiency.
  • Conventional manufacturing methods for producing twist blades can be very expensive. As a result, designers and manufacturers often provide non-twisted blades with their ceiling fans in order to create a more cost effective product from the seller's perspective. Consequently, it is desirable to combine the beneficial performance aspects of the twisted blades with the economics of the uniform conventional blades to achieve a high performance blade attachment or add-on accessory for conventional planar ceiling fan blades at a relatively low cost to the user.
  • Presently, there is no known fan blade attachment or add-on accessory which adapts a twisted fan blade shape to a conventional planar ceiling fan blade. It is an object of this invention to provide a fan blade attachment or add-on accessory for a preexisting ceiling fan which is much more economical than purchasing either a new set of twisted fan blades or an entirely new fan assembly. Yet another object of this invention is to provide a fan blade attachment or add-on accessory for conventional fan blades whose operating performance is comparable with or exceeds that of conventional twisted fan blade designs. These and other objects and advantages of this invention will become obvious upon further investigation.
  • Unlike other previous ceiling fan accessory blade attachments, the present invention combines a unique simplicity of form with great effectiveness, safety, and ease of use. The fan blade attachment's aerodynamic design and positioning on the rotating blades of a conventional fan enable a preexisting ceiling fan to move a much greater volume of air, thus eliminating the need to increase the rotational speed of the fan. This results in the saving of electrical energy that would otherwise be consumed if the same air turbulence were to be achieved without use of the present inventive fan blade attachments or add-on accessories.
  • Influenced by the high efficiency of modem aircraft wing flaps and augmented to apply to rotary motion, the present inventive concept allows users to simply secure the fan blade attachments directly onto preexisting conventional fan blades. This may be done quickly and easily without the use of sophisticated tools, hardware, or the needlessly complicated and cumbersome secondary or tertiary gadgets of previous inventions.
  • Thus, the need exists for better performing ceiling fan blade attachments or add-on accessories over those available in the prior art.
  • BRIEF SUMMARY OF THE INVENTION
  • In accordance with one embodiment, a ceiling fan blade attachment for enhancing the efficiency of a ceiling fan blade with the ceiling fan blade having a leading edge and a trailing edge, the ceiling fan blade attachment comprising a deflection element having a positive twist adjacent a proximal end of the ceiling fan blade attachment, so that pitch of the ceiling fan blade attachment decreases from the proximal end of the ceiling fan blade attachment to the distal end of the ceiling fan blade attachment; and at least one fixation member for securing the deflection surface to the ceiling fan blade.
  • The present invention provides aftermarket ceiling fan blade attachments that are aerodynamically optimized to move approximately 40% or more air than traditional planar ceiling fan blades. The present inventive fan blade attachments provide ceiling fan blades that are quieter and provide greater comfort than traditional planar ceiling fan blades. Such an efficient design may further reduce the tendency of traditional planar ceiling fan blades to wobble during use. With the movement of a larger air volume with less input, the present invention provides for reduced electrical power consumption and is more energy efficient than traditional planar ceiling fan blades. Thus, the present invention allows for the use of an aftermarket fan blade attachments that generate superior airflow when attached to conventional ceiling fan blades which typically revolve at approximately fifty to two hundred revolutions per minute.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 depicts a side view of an embodiment of the ceiling fan blade attachments of the present invention.
  • FIG. 2 depicts a perspective view of an embodiment of a ceiling fan blade attachment of the present invention.
  • FIG. 3 depicts a side view of an embodiment of a ceiling fan blade attachment of the present invention to illustrate the twist of the ceiling fan blade attachments of the present invention.
  • FIGS. 4A-4B depict side views of two embodiments of ceiling fan blade attachments of the present invention.
  • FIG. 5A depicts a planar top view of an embodiment of a unitary fan blade attachment blank of the present invention prior to bending and manipulation.
  • FIG. 5B depicts a perspective view of an embodiment of a unitary fan blade attachment blank of the present invention after formation of at least one fixation member.
  • FIG. 5C depicts a front view of an embodiment of a unitary fan blade attachment blank of the present invention after formation of both at least one fixation member and a positive blade twist.
  • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention provides for ceiling fan blade attachments for enhancing the breeze generated by conventional existing ceiling fan blades. As disclosed, the present invention allows a user to improve fan efficiency by modifying their existing fan blades without having to incur the high costs of complete fan replacement. The present invention enables the curvature of, preferably, a trailing edge of a conventional planar fan blade to be enhanced and/or extended (see FIG. 1), thereby permitting the existing blade to perform more work by moving more air. Moreover, the present invention provides for an inexpensive and simple means for reducing the noise associated with existing fan blades while at the same time maintaining fan work efficiency.
  • FIG. 1 depicts ceiling fan blade attachments 100 of the present invention secured to conventional planar ceiling fan blades 200, wherein the ceiling fan blades 200 have both a leading edge 210 and a trailing edge 220. A deflection element 10 of the ceiling fan blade attachment 100 may be secured to the ceiling fan blade 200 via at least one fixation member 15. A fan motor unit may be disposed immediately adjacent both a proximal end 20 of the ceiling fan blade attachment 100 and a proximal end of the ceiling fan blade 200 wherein a distal end 25 of the ceiling fan blade attachment 100 and a distal end of the ceiling fan blade 200 are disposed radially outward therefrom. The fan blade attachments 100 of the present invention allow for maximizing the air flow of existing ceiling fans having blade sweeps up to and beyond approximately 64 inches, with the ceiling fan blade attachments 100 shaped to maximize downward air flow at revolutions per minute (RPM) of up to approximately 200 RPM.
  • The fan blade attachments 100 of the present invention may be constructed of the same material as the existing fan blades 200 or the fan blade attachments 100 may be made of a different and/or more economical material. Materials of construction may comprise any materials known within the art including but not limited to plastics such as acrylonitrile butadiene styrene (ABS), extruded plastics such as nylon, resin reinforced plastic, fiberglass, wood, metal, extruded metal such as aluminum, expanded fluorocarbons, and/or other materials as desired. Fan blade attachments 100 composed of lighter material will exert less stress on the fan motor than blade attachments 100 made from material of heavier weight and denser mass. Such fan blade attachments 100 may be virtually noiseless, allow for a greater cubic feet per minute (CFM) output, and provide monetary savings via energy conservation. Depending on the materials chosen, the fan blade attachments 100 of the present invention may be of molded or extruded construction if so desired. The highly functional design and effective simplicity of this invention make it possible to reduce its production costs and subsequently relay a predictably lower price to consumers than other previously proposed heavier and complex supplementary ceiling fan blade assemblies. The presently disclosed economical fan blade attachments 100 having a positive twist providing greater work efficiency for existing ceiling fan assemblies, operate virtually noiseless and maintenance free, while eliminating extraneous parts that may wear out or require service and/or replacement.
  • The elements of a present inventive fan blade attachment 100 may comprise one or more pieces. With certain materials, such as plastics and/or specific metals, the deflection element 10 and the at least one fixation member 15 of the present invention may comprise a unitary structure for purposes of streamlining, simplifying, and reducing costs related to the manufacturing process. Alternatively, use of two or more distinct pieces and/or materials may be necessary for performance optimization of the present invention. Regardless of the number of pieces desired, each such piece may, after being installed, either permanently or removably affix the fan blade attachment 100 to the fan blade 200 thereby forming a highly efficient functional surface.
  • The permanent or removable connections may comprise at least one fixation member 15. Preferably, the at least one fixation member 15 is connected to the trailing edge 220 of an existing fan blade 200, but the scope of the present invention includes at least one fixation member 15 disposed about the trailing edge 220, the leading edge 210, the proximal end, and/or the distal end of an existing fan blade, and any combinations thereof. The at least one fixation member 15 may comprise any fixation members known within the art including but not limited to resilient clips, screw attachments, hook and loop fasteners, adhesive strips, bonding, gluing, riveting, bolting, welding or any other suitable fixing method for securing a fan blade attachment 100 to an existing fan blade 200. FIGS. 1-5C depict the at least one fixation member 15 as being at least one resilient clip capable of forming a removable yet firm friction fit connection between the fan blade attachment 100 and an existing fan blade 200. Depiction of only a resilient clip embodiment of the at least one fixation member 15 within the Figures is only meant to assist in comprehension of the present invention and is not limiting as to the scope of other embodiments of the at least one fixation member 15 and any legal equivalents thereof.
  • As depicted in FIG. 1, the ceiling fan blade attachment 100 of the present invention may be disposed along the trailing edge 220 of the existing fan blade 200 and it is preferable, but not required, for the fan blade attachment 100 to extend along the entire length of the trailing edge 220. It is also preferable, but not required, for the fan blade attachment 100 to have a constant or uniform width in order to provide a uniform improved deflection surface 10 in addition to providing an efficient positive twist of a fan blade attachment 100 of the present invention. A cross section of the deflection element 10 may comprise a variety of configurations including but not limited to a deflection element 10 of constant or uniform depth and/or a deflection element 10 of a tapered depth such as that of a conventional aircraft wing.
  • In alternative embodiments of the present invention, the fan blade attachment 100 may be disposed along at least half the length of the existing fan blade 200. The fan blade attachment 100 may still comprise a positive twist at its proximal end 20 and reduce its pitch as it approaches its distal end 25 at the approximate midpoint of or further down the length of the existing fan blade 200. In this manner, total surface area and material costs for manufacturing the fan blade attachment 100 may be reduced while still providing an efficiency improving positive twist at the proximal end 230 of an existing fan blade 200.
  • FIGS. 2 and 3 depict a perspective view and a side view, respectively, of a single fan blade attachment 100 of the embodiment of FIG. 1, showing the single fan blade attachment 100 having a deflection element 10 between a proximal end 20 and a distal end 25, and various reference cross-sections therebetween. A positive twist or pitch angle decreases along the rotational plane of the fan blade attachment 100 from its proximal end 20 to its distal end 25. The fan blade attachment 100 is positioned in a selected position as depicted in FIG. 1 by at least one fixation member 15. When held in position, the proximal end 20 of the fan blade attachment 100 may be disposed at a first pitch angle 30 of between approximately 20 degrees to approximately 35 degrees from a horizontal plane H that is parallel to a ceiling (see FIG. 3). The distal end 25 of the fan blade attachment 100 may have a second pitch angle 35 of between approximately 5 degrees to approximately 16 degrees from the horizontal plane H. The mid cross-sectional areas therebetween have varying angles of twist between the proximal end 20 and the distal end 25 of the fan blade attachment 100.
  • The deflection member 10 comprises an efficient positive twist configuration. The positive twist, or pitch of the ceiling fan blade attachment 100, increases from the distal end 25 of the ceiling fan blade attachment 100 to the proximal end 20. Such a positive twist maximizes air flow along the entire length of the blade 200, including the proximal end of the fan blade 200 where inefficiencies are very common in the art. In the present invention, the proximal end 20 of the fan blade attachment 100 is pitched at a higher angle than the distal end 25. Typically, the lower angular velocity present on axial fans near the center of the fan (i.e. proximal region) requires greater blade twist in that area to provide airflow which is uniform with or similar to that generated by the distal end.
  • Preferably, use of the present inventive fan blade attachments 100 may provide a first pitch angle 30 of approximately 20 degrees to approximately 35 degrees from the horizontal plane H at the proximal end 20 of the blade attachment 100. The positive twist or pitch angle decreases toward the distal end 25 of the blade attachment 100 thereby providing greater air flow than existing planar ceiling fan blades 200. The distal end 25 of the present inventive device may comprise a second pitch angle 35 of approximately 5 degrees to approximately 16 degrees from the horizontal plane H. The blade attachments 100 may generally include a concave raised bottom and a flat or convex shaped upper surface. The blade attachments 100 may be mounted to existing ceiling fan blades to provide enhanced airflow at speeds of up to approximately 200 RPM. The novel ceiling fan blade attachments 100 may be manufactured to accommodate all sizes of existing fan blades 200 including but not limited to fan blade sweeps of up to and beyond approximately 64 inches.
  • Conventional existing ceiling fan blades 200 are planar (i.e. no twist) and commonly disposed at a third pitch angle 40 (see FIG. 3) of between approximately 8 degrees to approximately 16 degrees. Any deflection element 10 of a fan blade attachment 100 extrapolating the plane of an existing planar fan blade 200 would inherently be disposed at the third pitch angle 40 relative to the horizontal plane H. In a preferred embodiment, the sum of the third pitch angle 40 and an angle from which the deflection element 10 deviates from the existing fan blade 200 plane is equivalent to the first pitch angle 30 at the proximal end 20 of the fan blade attachment 100 and is equivalent to the second pitch angle 35 at the distal end 25 of the fan blade attachment 100. Given the range of third pitch angles 40 found in the wide variety of existing planar fan blades 200, respective fan blade attachments 100 of the present invention may be manufactured in a variety of angles to complement all configurations of existing planar fan blades 200 and the inherent third pitch angles 40 thereof. The goal of the present invention is to provide a fan blade attachment 100 for an existing planar fan blade 200 which will combine to provide both a first pitch angle 30 of between approximately 20 degrees to 35 degrees and a second pitch angle 35 of between approximately 5 degrees to 16 degrees relative to the horizontal plane H.
  • FIGS. 4A-4B depict further embodiments of the present inventive fan blade attachment 100. The width of the fan blade attachment 100 is preferably less than the width of the existing planar fan blade 200. A fan blade attachment 100 width of approximately 2 inches may be preferred, but is by no means limiting as to the scope of the width of other fan blade attachment 100 embodiments. FIG. 4A depicts a preferred embodiment wherein the deflection element 10 of a fan blade attachment 100 is disposed along the trailing edge 220 of an existing planar fan blade 200. In such a configuration, the second pitch angle 35 may be greater than or equal to the third pitch angle 40 (see FIG. 3 generally). A second embodiment may comprise the deflection element 10 being disposed further up the existing planar fan blade 200 toward its leading edge 210. In such a configuration the distal end 25 of the fan blade attachment 100 may extrapolate the plane within which the existing fan blade 200 is disposed (third pitch angle 40). Another embodiment of a fan blade attachment 100 may have a width approximately equal to one half of the width of the existing fan blade 200. Such a configuration may provide a greater surface area for the deflection element 10 but also increases the drag resistance against the ceiling fan motor (see FIG. 1). FIG. 4B depicts an embodiment of a fan blade attachment 100 having a width approximately equal to the width of the existing fan blade 200. In such a configuration, the surface area of the fan blade attachment 100 may effectively replace the functional deflecting surface of the existing fan blade 200. A positive twist of the deflection element 10 is thereby disposed from the leading edge 210 of the fan blade 200 to the trailing edge 220 of the fan blade 200. In such a configuration requiring a greater amount of fan blade attachment 100 material and thereby producing a significant increase in air drag, a fan blade attachment 100 comprising lightweight material is highly preferred. In an embodiment such as that depicted in FIG. 4B, the fan blade attachment 100 may be secured via at least one fixation member 15 disposed about the leading edge 210, the trailing edge 220, the proximal edge 230, or the distal edge 240 of the existing fan blade 200, and/or any combinations thereof.
  • FIGS. 5A-5C depict a preferred embodiment of the fan blade attachments 100 of the present invention as well as a preferred embodiment of its method of manufacture. FIG. 5A depicts a planar unitary fan blade attachment blank 300 prior to any manipulation during the manufacturing process. A preferred material for the fan blade attachment blank 300 is ABS plastic. The depicted fan blade attachment blank 300 is shown having a rectangular deflection element 310 and three fixation members 315, however, the illustration of such a preferred embodiment is not meant to limit or restrict the scope of the present invention. Preferably, the deflection element 310 may be approximately two inches in width but the present invention includes any and all deflection element 310 widths associated with fan blade attachments conforming to the appended claims. FIG. 5B depicts the fan blade attachment blank 300 after the ABS material of the three fixation members 315 has been bent and manipulated into respective unitary clip configurations providing for a resilient friction fit over an edge (preferably the trailing edge 220) of an existing fan blade 200. The present invention may further comprise at least one securement aperture 316 through which a screw of other fastener known within the art may pass to provide a greater connection between the fan blade attachment blank 300 and an existing fan blade 200. Such a securement aperture 316 may allow for retention of the fan blade attachment blank 300 up to and beyond the highest anticipated fan blade speeds of approximately 200 RPM. One or more securement apertures 316 may be disposed in one or more of the fixation members 315. FIG. 5C depicts the final configuration of a preferred fan blade attachment blank 300 of the present invention wherein a positive twist has been incorporated into the deflection element 310. The pitch of the deflection element 310 may have its greatest value at the proximal end 320 of the fan blade attachment blank 300 and its lowest value at the distal end 325 of the fan blade attachment blank 300. FIG. 5C also shows the incorporation of at least one securement aperture 316 disposed through at least one fixation member 315.
  • The fan blade attachments 100 of the present invention may further comprise any and all decorative and design surfaces known within the art. A user may understandably desire an efficient fan blade attachment 100 of the present invention to match and/or coordinate with the color or design of their existing fan blades 200. While not critical to the functionality of the present inventive device, the fan blade attachments 100 of the present invention may visually display an aesthetic surface image including but not limited to solid colors, patterns, designs, wood grains, wood finishes, transparent material, and the like. Such alternate aesthetic design embodiments may provide a consumer with additional decorating or design options and thus serve to increase the overall desirability of the present inventive device.
  • The present invention provides fan blade attachments 100 for existing planar fan blades 200 which dramatically improve the work efficiency of preexisting ceiling fans. Use of the present invention will lower monthly electric bills and allow for an equivalent amount of work to be done by a fan set at a lower speed. Generally, a preferred embodiment of the present invention includes fan blade attachments 100 secured to the trailing edges 220 of existing planar fan blades 200, wherein the pitch of the blade attachment 100 increases from its distal end 25 to its proximal end 20, wherein the existing fan blade 200 is operated within speed ranges of approximately 50 RPM to approximately 200 RPM, and provides for substantial energy savings and increased air flow as compared to conventional planar ceiling fan blades 200.
  • While the above description contains much specificity, these should not be construed as limitations on the scope of any embodiment, but as exemplifications of the presently preferred embodiments thereof. Many other ramifications and variations are possible within the teachings of the various embodiments.
  • Thus the scope of the invention should be determined by the appended claims and their legal equivalents, and not by the examples given.

Claims (20)

1. A ceiling fan blade attachment for enhancing the efficiency of a ceiling fan blade with said ceiling fan blade having a leading edge and a trailing edge, said ceiling fan blade attachment comprising:
a deflection element having a positive twist adjacent a proximal end of said ceiling fan blade attachment, so that pitch of said ceiling fan blade attachment decreases from said proximal end of said ceiling fan blade attachment to a distal end of said ceiling fan blade attachment; and
at least one fixation member for securing said deflection element to said ceiling fan blade.
2. The ceiling fan blade attachment of claim 1, wherein said at least one fixation member secures said deflection element to said trailing edge of said ceiling fan blade.
3. The ceiling fan blade attachment of claim 1, wherein said at least one fixation member secures said deflection element to said leading edge of said ceiling fan blade.
4. The ceiling fan blade attachment of claim 1, wherein said at least one fixation member secures said deflection element to said ceiling fan blade at one or more locations selected from the group consisting of said leading edge, said trailing edge, a proximal end, and a distal end of said ceiling fan blade.
5. The ceiling fan blade attachment of claim 1, wherein said at least one fixation member is selected from the group consisting of at least one clip, at least one screw attachment, at least one hook and loop fastener, at least one adhesive strip, at least one bond, at least one glue attachment, at least one rivet, at least one bolt, and at least one weldjoint.
6. The ceiling fan blade attachment of claim 1, wherein said ceiling fan blade attachment is disposed along said ceiling fan blade from a proximal end of said ceiling fan blade to at least the approximate midpoint of said ceiling fan blade.
7. The ceiling fan blade attachment of claim 1, wherein said ceiling fan blade attachment is disposed along said ceiling fan blade from a proximal end of said ceiling fan blade to a distal end of said ceiling fan blade.
8. The ceiling fan blade attachment of claim 1, wherein the width of said ceiling fan blade attachment is equivalent to the width of said ceiling fan blade.
9. The ceiling fan blade attachment of claim 1, wherein the width of said ceiling fan blade attachment is less than the width of said ceiling fan blade.
10. The ceiling fan blade attachment of claim 1, wherein the sweep of said ceiling fan blade measures between 20 inches and 64 inches.
11. The ceiling fan blade attachment of claim 1, wherein said pitch of said ceiling fan blade attachment at said proximal end is between 20 degrees to 35 degrees relative to a horizontal plane and said pitch of said ceiling fan blade attachment at said distal end is between 5 degrees and 16 degrees relative to said horizontal plane.
12. A ceiling fan blade attachment for enhancing the efficiency of a ceiling fan blade with said ceiling fan blade having a leading edge and a trailing edge, said ceiling fan blade attachment comprising:
a deflection element having a positive twist adjacent a proximal end of said ceiling fan blade attachment, so that pitch of said ceiling fan blade attachment decreases from said proximal end of said ceiling fan blade attachment to a distal end of said ceiling fan blade attachment; and
at least one fixation member for securing said deflection element to said ceiling fan blade;
wherein said ceiling fan blade attachment is disposed along said ceiling fan blade from a proximal end of said ceiling fan blade to at least the approximate midpoint of said ceiling fan blade.
13. The ceiling fan blade attachment of claim 12, wherein said at least one fixation member is selected from the group consisting of at least one clip, at least one screw attachment, at least one hook and loop fastener, at least one adhesive strip, at least one bond, at least one glue attachment, at least one rivet, at least one bolt, and at least one weld joint.
14. The ceiling fan blade attachment of claim 12, wherein said at least one fixation member secures said deflection element to said ceiling fan blade at one or more locations selected from the group consisting of said leading edge, said trailing edge, a proximal end, and a distal end of said ceiling fan blade.
15. The ceiling fan blade attachment of claim 12, wherein said ceiling fan blade attachment is disposed along said ceiling fan blade from a proximal end of said ceiling fan blade to a distal end of said ceiling fan blade.
16. The ceiling fan blade attachment of claim 12, wherein the width of said ceiling fan blade attachment is less than the width of said ceiling fan blade.
17. The ceiling fan blade attachment of claim 12, wherein the width of said ceiling fan blade attachment is equivalent to the width of said ceiling fan blade.
18. The ceiling fan blade attachment of claim 12, wherein the sweep of said ceiling fan blade measures between 20 inches and 64 inches.
19. The ceiling fan blade attachment of claim 12, wherein said pitch of said ceiling fan blade attachment at said proximal end is between 20 degrees to 35 degrees relative to a horizontal plane and said pitch of said ceiling fan blade attachment at said distal end is between 5 degrees and 16 degrees relative to said horizontal plane.
20. A ceiling fan blade attachment for enhancing the efficiency of a ceiling fan blade with said ceiling fan blade having a leading edge and a trailing edge, said ceiling fan blade attachment comprising:
a deflection element having a positive twist adjacent a proximal end of said ceiling fan blade attachment, so that pitch of said ceiling fan blade attachment decreases from said proximal end of said ceiling fan blade attachment to a distal end of said ceiling fan blade attachment; and
at least one fixation member for securing said deflection element to said ceiling fan blade, wherein said at least one fixation member is selected from the group consisting of at least one clip, at least one screw attachment, at least one hook and loop fastener, at least one adhesive strip, at least one bond, at least one glue attachment, at least one rivet, at least one bolt, and at least one weldjoint;
wherein said at least one fixation member secures said deflection element to said ceiling fan blade at one or more locations selected from the group consisting of said leading edge, said trailing edge, a proximal end, and a distal end of said ceiling fan blade;
wherein said positive twist of said ceiling fan blade attachment is disposed along said ceiling fan blade from said proximal end of said ceiling fan blade to said distal end of said ceiling fan blade;
wherein the width of said ceiling fan blade attachment is less than the width of said ceiling fan blade;
wherein the sweep of said ceiling fan blade measures between 20 inches and 64 inches; and
wherein said pitch of said ceiling fan blade attachment at said proximal end is between 20 degrees to 35 degrees relative to a horizontal plane and said pitch of said ceiling fan blade attachment at said distal end is between 5 degrees and 16 degrees relative to said horizontal plane.
US12/132,223 2008-06-03 2008-06-03 Breeze Enhancing Fan Blade Attachment Abandoned US20090297360A1 (en)

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