EP0051005A1 - Axial-flow ventilator with protected rotor blades - Google Patents

Axial-flow ventilator with protected rotor blades Download PDF

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Publication number
EP0051005A1
EP0051005A1 EP81401532A EP81401532A EP0051005A1 EP 0051005 A1 EP0051005 A1 EP 0051005A1 EP 81401532 A EP81401532 A EP 81401532A EP 81401532 A EP81401532 A EP 81401532A EP 0051005 A1 EP0051005 A1 EP 0051005A1
Authority
EP
European Patent Office
Prior art keywords
hub
grid
ferrule
blades
fan according
Prior art date
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.)
Granted
Application number
EP81401532A
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German (de)
French (fr)
Other versions
EP0051005B1 (en
Inventor
Joel Crespin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lunite Hermetique SA
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Lunite Hermetique SA
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Lunite Hermetique SA filed Critical Lunite Hermetique SA
Publication of EP0051005A1 publication Critical patent/EP0051005A1/en
Application granted granted Critical
Publication of EP0051005B1 publication Critical patent/EP0051005B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/219—Guards
    • Y10T74/2191—Guards for rotary member

Definitions

  • the present invention relates to an axial fan provided with a facial and radial protection device.
  • the present invention relates to the realization of a space-saving axial fan, of low cost price, having satisfactory aerodynamic characteristics and comprising a facial and radial protection device which prevents the introduction of foreign bodies between the fan blades.
  • an axial fan comprising a hub carrying blades, provided with a central hole for the passage of the motor shaft, and a protection device comprising a face protection grid for the blades and a radial protection ferrule, integral with the grid, this ferrule being coaxial with the motor shaft and surrounding the radial ends of the blades, is characterized in that this protection device is integral with the hub of the fan.
  • Another object of the invention is the production by molding, in one piece, of the fan protection device, means allowing the assembly of this protection device on the hub.
  • Another object of the invention is the production, in a single piece, of the protective device, by molding, of a plastic material.
  • the invention also relates to the production by molding in a single block, of the axial and radial protection device, of the hub and of the fan blades.
  • the fan according to the invention comprises a hub 15 carrying blades 12, 13 and a protection device comprising a face protection grid 11 formed of several concentric rings 20 connected to each other by arms 21.
  • This grid 11 is provided, at its periphery, with a radial protection ferrule 10 formed by a cylindrical wall, coaxial with the rings 20.
  • the arms 21 can be obtained by extensions of this ferrule 10.
  • the facial grid 10 is provided with a central orifice, the flange 22 of which is curved so as to be substantially parallel to the ferrule 10.
  • This flange 22, intended for fixing the protection device on the hub 15 of the fan can be introduced into a hollow part 18 of the free end of the hub 15 which has a central hole 16 for the passage of a motor shaft (not shown) of the fan, holes 17 allowing the fixing the hub 15 on the shaft.
  • the immobilization of the protection device on the hub 15 can then be done using glue, rivets, screws or any other suitable means of assembly.
  • the protection device can rotate at the same speed as this hub 15.
  • the cylindrical wall of the ferrule 10 is arranged coaxially around the blades 12 and 13 of the fan, its axis coinciding with the axis of rotation of the motor shaft.
  • the inner parts of the blades 12, 13 are attached to a cylindrical wall integral with the hub 15 and coaxial with this hub 15 which has the shape of a disc.
  • the blades 12, 13 and the hub 15 were obtained, in this embodiment, in one piece, by molding a plastic material, or other moldable material, allowing to benefit from a cost price. very reduced.
  • the grid 11 and the protective shell 10 can also be obtained, in one piece, by molding a plastic or other material.
  • the outer surface of the cylindrical wall of the shell 10 must be smooth. In fact, when the fan is operating, the objects or external elements which may come into contact with this shell 10 will be pushed back or deflected and cannot in any way come into contact with the blades 12, 13.
  • the concentric rings 20 of the grid are arranged tight enough to effectively reduce the intervals 23 between the rings 20. These rings 20 are partially in contact with the upstream edges 24 of the blades 12, 13 so as to reinforce the structure of the grid 11 as shown in FIGS. 1 and 2.
  • the fan according to the invention can comprise any number of blades, six for example, as shown in FIG. 1.
  • the protection device 30 comprising a face grid 31 and a ferrule 10, is molded in one piece with the hub 15 and the blades 32, 33.
  • the grid 31 is formed of concentric rings 34 partially in contact with the upstream edge 35 of the blades 32, 33. In this way, the positioning arms of the concentric rings 34 are eliminated, because they have become unnecessary.
  • This embodiment using a one-piece molding, is particularly advantageous and makes it possible to obtain axial fans with facial and radial protection, which can be mounted without disadvantage in many industrial, semi-industrial or household appliances.

Abstract

Un ventilateur conforme à l'invention comporte au moins deux pales (12, 13) fixées sur un moyeu (15) destiné à être solidarisé à un arbre moteur, une grille (11) de protection solidaire du moyeu (15), protégeant l'avant du ventilateur et se prolongeant, sur la périphérie du ventilateur, par une virole (10) assurant la protection des extrémités radiales des pales. Application à des appareillages industriels, semi-industriels ou ménagers, groupes frigorifiques par exemple.A fan according to the invention comprises at least two blades (12, 13) fixed on a hub (15) intended to be secured to a motor shaft, a protective grid (11) secured to the hub (15), protecting the front of the fan and extending, on the periphery of the fan, by a ferrule (10) ensuring the protection of the radial ends of the blades. Application to industrial, semi-industrial or household appliances, refrigeration units for example.

Description

La présente invention concerne un ventilateur axial muni d'un dispositif de protection faciale et radiale.The present invention relates to an axial fan provided with a facial and radial protection device.

Elle a pour but d'éviter un contact accidentel dangereux d'éléments extérieurs avec les pales du ventilateur.Its purpose is to avoid dangerous accidental contact of external elements with the fan blades.

On connaît des ventilateurs à hélice pour lesquels la nécessité de rendre non dangereux les contacts accidentels d'éléments extérieurs avec les pales a conduit à adopter des pales en matière souple. En général, il est difficile de concilier de bonnes caractéristiques aérodynamiques avec une souplesse de matière suffisante pour rendre les chocs non dangereux.Propeller fans are known for which the need to make accidental contact of external elements with the blades non-hazardous has led to the adoption of blades made of flexible material. In general, it is difficult to reconcile good aerodynamic characteristics with sufficient material flexibility to make impacts non-hazardous.

Une autre solution couramment adoptée consiste à utiliser des pales rigides tournant à l'intérieur d'une cage de protection fixe grillagée ou à barreaux et dont les mailles laissent passer l'air propulsé. Une telle cage de protection est coûteuse et augmente sensiblement le volume et le poids de l'ensemble du ventilateur.Another commonly adopted solution consists in using rigid blades rotating inside a fixed protective cage with bars or bars and the meshes of which allow the propelled air to pass. Such a protective cage is expensive and significantly increases the volume and the weight of the fan assembly.

La présente invention a pour objet la réalisation d'un ventilateur axial peu encombrant, de faible prix de revient, ayant des caractéristiques aérodynamiques satisfaisantes et comportant un dispositif de protection faciale et radiale qui empêche l'introduction de corps étrangers entre les pales du ventilateur.The present invention relates to the realization of a space-saving axial fan, of low cost price, having satisfactory aerodynamic characteristics and comprising a facial and radial protection device which prevents the introduction of foreign bodies between the fan blades.

Suivant l'invention, un ventilateur axial comportant un moyeu porteur de pales, muni d'un trou central pour le passage de l'arbre moteur, et un dispositif de protection comprenant une grille de protection faciale des pales et une virole de protection radiale, solidaire de la grille, cette virole étant coaxiale à l'arbre moteur et entourant les extrémités radiales des pales, est caractérisé en ce que ce dispositif de protection est solidaire du moyeu du ventilateur.According to the invention, an axial fan comprising a hub carrying blades, provided with a central hole for the passage of the motor shaft, and a protection device comprising a face protection grid for the blades and a radial protection ferrule, integral with the grid, this ferrule being coaxial with the motor shaft and surrounding the radial ends of the blades, is characterized in that this protection device is integral with the hub of the fan.

Un autre objet de l'invention est la réalisation par moulage, en une seule pièce, du dispositif de protection du ventilateur, des moyens permettant l'assemblage de ce dispositif de protection sur le moyeu.Another object of the invention is the production by molding, in one piece, of the fan protection device, means allowing the assembly of this protection device on the hub.

Un autre objet de l'invention est la réalisation, en une seule pièce, du dispositif de protection, par moulage, d'une matière plastique.Another object of the invention is the production, in a single piece, of the protective device, by molding, of a plastic material.

L'invention a également pour objet la réalisation par moulage en un seul bloc, du dispositif de protection axiale et radiale, du moyeu et des pales du ventilateur.The invention also relates to the production by molding in a single block, of the axial and radial protection device, of the hub and of the fan blades.

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description ci-après et des dessins qui l'accompagnent et sur lésqùels :

  • - la figure 1 représente une vue en élévation d'un mode de réalisation du dispositif de protection pour ventilateur axial conforme à l'invention.
  • - la figure 2 représente une vue en coupe diamétrale AA du dispositif précédent.
  • - la figure 3 représente une vue en élévation d'un mode de réalisation d'un ensemble monobloc comprenant un ventilateur axial et son dispositif de protection conformes à l'invention.
  • - la figure 4 représente une vue en coupe diamétrale BB de l'ensemble montré par la figure 3.
  • - la figure 5 représente une vue en coupe radiale
  • .SS de l'ensemble montré par les figures 3 et 4.
The invention will be better understood and other characteristics will appear with the aid of the description below and of the accompanying drawings and on which:
  • - Figure 1 shows an elevational view of an embodiment of the protection device for axial fan according to the invention.
  • - Figure 2 shows a diametral sectional view AA of the previous device.
  • - Figure 3 shows an elevational view of an embodiment of a one-piece assembly comprising an axial fan and its protection device according to the invention.
  • FIG. 4 represents a view in diametrical section BB of the assembly shown in FIG. 3.
  • - Figure 5 shows a radial sectional view
  • .SS of the assembly shown in Figures 3 and 4.

Dans l'ensemble de réalisation montré en figures 1 et 2, le ventilateur suivant l'invention comprend un moyeu 15 porteur de pales 12, 13 et un dispositif de protection comportant une grille 11 de protection faciale formée de plusieurs anneaux 20 concentriques reliés entre eux par des bras 21. Cette grille 11 est munie, à sa périphérie, d'une virole 10 de protection radiale formée d'une paroi cylindrique, coaxiale aux anneaux 20. Les bras 21 peuvent être obtenus par des prolongements de cette virole 10.In the assembly shown in FIGS. 1 and 2, the fan according to the invention comprises a hub 15 carrying blades 12, 13 and a protection device comprising a face protection grid 11 formed of several concentric rings 20 connected to each other by arms 21. This grid 11 is provided, at its periphery, with a radial protection ferrule 10 formed by a cylindrical wall, coaxial with the rings 20. The arms 21 can be obtained by extensions of this ferrule 10.

Dans l'exemple représenté en figure 2, la grille 10 faciale est munie d'un orifice central dont le rebord 22 est recourbé de façon à être sensiblement parallèle à la virole 10. Ce rebord 22, destiné à la fixation du dispositif de protection sur le moyeu 15 du ventilateur peut venir s'introduire dans une partie creuse 18 de l'extrémité libre du moyeu 15 qui comporte un trou 16 central pour le passage d'un arbre de moteur (non représenté) du ventilateur, des trous 17 permettant la fixation du moyeu 15 sur l'arbre. L'immobilisation du dispositif de protection sur le moyeu 15 peut alors s'effectuer au moyen de colle, de rivets, de vis ou tout autre moyen d'assemblage convenable. Après assemblage sur le moyeu 15, le dispositif de protection peut tourner à la même vitesse que ce moyeu 15. La paroi cylindrique de la virole 10 est disposée coaxialement autour des pales 12 et 13 du ventilateur, son axe coïncidant avec l'axe de rotation de l'arbre moteur.In the example shown in FIG. 2, the facial grid 10 is provided with a central orifice, the flange 22 of which is curved so as to be substantially parallel to the ferrule 10. This flange 22, intended for fixing the protection device on the hub 15 of the fan can be introduced into a hollow part 18 of the free end of the hub 15 which has a central hole 16 for the passage of a motor shaft (not shown) of the fan, holes 17 allowing the fixing the hub 15 on the shaft. The immobilization of the protection device on the hub 15 can then be done using glue, rivets, screws or any other suitable means of assembly. After assembly on the hub 15, the protection device can rotate at the same speed as this hub 15. The cylindrical wall of the ferrule 10 is arranged coaxially around the blades 12 and 13 of the fan, its axis coinciding with the axis of rotation of the motor shaft.

Dans l'exemple représenté en figure 2, les parties intérieures des pales 12, 13 sont attachées à une paroi cylindrique solidaire du moyeu 15 et coaxiale à ce moyeu 15 qui a la forme d'un disque.In the example shown in Figure 2, the inner parts of the blades 12, 13 are attached to a cylindrical wall integral with the hub 15 and coaxial with this hub 15 which has the shape of a disc.

En fait, les pales 12, 13 et le moyeu 15 ont été obtenus, dans cet exemple de réalisation, d'une seule pièce, par moulage d'une matière plastique, ou autre matériau moulable, permettant de bénéficier d'un prix de revient très réduit.In fact, the blades 12, 13 and the hub 15 were obtained, in this embodiment, in one piece, by molding a plastic material, or other moldable material, allowing to benefit from a cost price. very reduced.

Pour la même raison, la grille 11 et la virole 10 de protection peuvent être également obtenues, d'une seule pièce, par moulage d'une matière plastique ou autre.For the same reason, the grid 11 and the protective shell 10 can also be obtained, in one piece, by molding a plastic or other material.

La surface extérieure de la paroi cylindrique de la virole 10 doit être lisse. En effet, lorsque le ventilateur fonctionne, les objets ou éléments extérieurs-pouvant venir en contact avec cette virole 10 seront repoussés ou déviés et ne pourront er aucune façon entrer en contact avec les pales 12, 13.The outer surface of the cylindrical wall of the shell 10 must be smooth. In fact, when the fan is operating, the objects or external elements which may come into contact with this shell 10 will be pushed back or deflected and cannot in any way come into contact with the blades 12, 13.

Par ailleurs, les anneaux 20 concentriques de la grille sont disposés de façon assez serrée pour réduire efficacement les intervalles 23 entre les anneaux 20. Ces anneaux 20 sont partiellement en contact avec les bords amont 24 des pales 12, 13 de façon à renforcer la structure de la grille 11 comme montré en figures 1 et 2.Furthermore, the concentric rings 20 of the grid are arranged tight enough to effectively reduce the intervals 23 between the rings 20. These rings 20 are partially in contact with the upstream edges 24 of the blades 12, 13 so as to reinforce the structure of the grid 11 as shown in FIGS. 1 and 2.

Il-est entendu que le ventilateur suivant l'invention peut comporter un nombre quelconque de pales, six par exemple, comme montré en figure 1.It is understood that the fan according to the invention can comprise any number of blades, six for example, as shown in FIG. 1.

Dans un autre exemple de réalisation montré en figures 3, 4 et 5, le dispositif de protection 30 suivant l'invention, comprenant une grille 31 faciale et une virole 10, est moulé en une seule pièce avec le moyeu 15 et les pales 32,33.La grille 31 est formée d'anneaux 34 concentriques partiellement en contact avec le bord amont 35 des pales 32, 33. De cette façon, les bras de positionnement des anneaux 34 concentriques sont supprimés, car devenus inutiles.In another exemplary embodiment shown in FIGS. 3, 4 and 5, the protection device 30 according to the invention, comprising a face grid 31 and a ferrule 10, is molded in one piece with the hub 15 and the blades 32, 33. The grid 31 is formed of concentric rings 34 partially in contact with the upstream edge 35 of the blades 32, 33. In this way, the positioning arms of the concentric rings 34 are eliminated, because they have become unnecessary.

Ce mode de réalisation, utilisant un moulage monobloc, est particulièrement avantageux et permet d'obtenir des ventilateurs axiaux à protection faciale et radiale, qui peuvent être montés sans inconvénient dans beaucoup d'appareils industriels, semi-industriels ou électro-ménagers.This embodiment, using a one-piece molding, is particularly advantageous and makes it possible to obtain axial fans with facial and radial protection, which can be mounted without disadvantage in many industrial, semi-industrial or household appliances.

A titre indicatif, de tels ventilateurs peuvent équiper des groupes frigorifiques dont ils augmentent sensiblement le rendement.As an indication, such fans can equip refrigeration units whose performance they significantly increase.

Claims (9)

1. Ventilateur axial comportant un moyeu (15) porteur d'au moins deux pales (12, 13) et muni d'un trou (16) central pour le passage de l'arbre moteur, un dispositif de protection comprenant une grille (11) de protection faciale et une virole (10) de protection radiale solidaire de la grille, cette virole étant formée d'une paroi cylindrique coaxiale à l'arbre moteur et entourant les extrémités radiales des pales (12 et 13), caractérisé en ce que ce dispositif de protection est solidaire du moyeu (15).1. Axial fan comprising a hub (15) carrying at least two blades (12, 13) and provided with a hole (16) central for the passage of the motor shaft, a protection device comprising a grid (11 ) of facial protection and a ferrule (10) of radial protection integral with the grid, this ferrule being formed by a cylindrical wall coaxial with the motor shaft and surrounding the radial ends of the blades (12 and 13), characterized in that this protection device is integral with the hub (15). 2. Ventilateur suivant la revendication 1, caractérisé en ce que la grille (11) et la virole (10) sont moulées en une seule pièce.2. Fan according to claim 1, characterized in that the grid (11) and the ferrule (10) are molded in one piece. 3. Ventilateur suivant la revendication 2, caractérisé en ce que la grille (11) est munie d'un orifice central présentant un rebord (22) recourbé vers l'intérieur, parallèlement à la paroi cylindrique de la virole (10), ce rebord (22) étant destiné à la fixation du dispositif de protection sur le moyeu (15).3. Fan according to claim 2, characterized in that the grid (11) is provided with a central orifice having a flange (22) curved inwards, parallel to the cylindrical wall of the ferrule (10), this flange (22) being intended for fixing the protection device to the hub (15). 4. Ventilateur suivant la revendication 3, caractérisé en ce que la grille (11) est formée d'anneaux (20) concentriques coaxiaux à l'arbre moteur et en ce que des bras (21), prolongements partiels de la virole (10), relient les anneaux (20) entre eux et au rebord (22).4. Fan according to claim 3, characterized in that the grid (11) is formed of concentric rings (20) coaxial with the motor shaft and in that arms (21), partial extensions of the ferrule (10) , connect the rings (20) to each other and to the flange (22). 5. Ventilateur suivant la revendication 3, caractérisé en ce que l'extrémité libre du moyeu (15) comprend une partie creuse dans laquelle peut venir s'introduire le rebord (22) recourbé et en ce que des moyens permettent de fixer ce rebord (22) sur la paroi de la partie creuse du moyeu (15).5. Fan according to claim 3, characterized in that the free end of the hub (15) comprises a hollow part in which can come introduce the curved flange (22) and in that means make it possible to fix this flange (22) on the wall of the hollow part of the hub (15). 6. Ventilateur suivant la revendication 1, caractérisé en ce que la grille (31), la virole (10), les pales (32, 33) et le moyeu (15) sont moulés en une seule pièce.6. Fan according to claim 1, characterized in that the grid (31), the ferrule (10), the blades (32, 33) and the hub (15) are molded in one piece. 7. Ventilateur suivant la revendication 6, caractérisé en ce que la grille (31) est formée d'anneaux (34) concentriques,soudés sur le bord amont (35) des pales (32, 33).7. Fan according to claim 6, characterized in that the grid (31) is formed of concentric rings (34), welded to the upstream edge (35) of the blades (32, 33). 8. Ventilateur suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que le matériau de moulage est une matière plastique synthétique.8. Fan according to any one of claims 1 to 7, characterized in that the molding material is a synthetic plastic material. 9. Ventilateur suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que la paroi cylindrique de la virole (10) est lisse.9. Fan according to any one of claims 1 to 8, characterized in that the cylindrical wall of the ferrule (10) is smooth.
EP81401532A 1980-10-17 1981-10-02 Axial-flow ventilator with protected rotor blades Expired EP0051005B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8022273 1980-10-17
FR8022273A FR2492477A1 (en) 1980-10-17 1980-10-17 PROTECTIVE DEVICE FOR AXIAL FAN AND AXIAL FAN HAVING SUCH A DEVICE

Publications (2)

Publication Number Publication Date
EP0051005A1 true EP0051005A1 (en) 1982-05-05
EP0051005B1 EP0051005B1 (en) 1985-06-19

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EP81401532A Expired EP0051005B1 (en) 1980-10-17 1981-10-02 Axial-flow ventilator with protected rotor blades

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US (1) US4456431A (en)
EP (1) EP0051005B1 (en)
JP (1) JPS5797099A (en)
DE (1) DE3171043D1 (en)
ES (1) ES269207Y (en)
FR (1) FR2492477A1 (en)
PT (1) PT73829B (en)

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EP0474019A1 (en) * 1990-09-03 1992-03-11 Nippondenso Co., Ltd. A cooling fan apparatus for an automobile

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US6099258A (en) * 1998-10-09 2000-08-08 Lasko Holdings, Inc. High velocity fan
DE20208250U1 (en) * 2002-05-27 2003-10-02 Guentner Gmbh Hans Protection against accidental contact for fans, in particular for air coolers
WO2015074662A1 (en) * 2013-11-20 2015-05-28 Nilfisk-Advance A/S A cleaning device
US10876545B2 (en) * 2018-04-09 2020-12-29 Vornado Air, Llc System and apparatus for providing a directed air flow

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US2361676A (en) * 1939-05-15 1944-10-31 Lin E Baker Device for impelling and propelling fluid or gas or the like
US2791373A (en) * 1956-03-16 1957-05-07 John D Wilcox Safety guard for electric fans
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Also Published As

Publication number Publication date
JPS5797099A (en) 1982-06-16
PT73829A (en) 1981-11-01
DE3171043D1 (en) 1985-07-25
FR2492477A1 (en) 1982-04-23
ES269207U (en) 1983-06-16
ES269207Y (en) 1984-01-16
FR2492477B1 (en) 1985-01-04
US4456431A (en) 1984-06-26
EP0051005B1 (en) 1985-06-19
PT73829B (en) 1983-01-25

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