Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2812900 A
Publication typeGrant
Publication dateNov 12, 1957
Filing dateNov 16, 1954
Priority dateNov 16, 1954
Publication numberUS 2812900 A, US 2812900A, US-A-2812900, US2812900 A, US2812900A
InventorsMatthews Charles L
Original AssigneeWm H Welsh Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fan guard
US 2812900 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Nov. 12, 1957 c. L. MATTHEWS FAN GUARD Filed Nov. 16. 1954 W ,W M

Clwyd@ SZ.

nited States Patent O "ice FAN. GUARD Charles L. Matthews, Chicago, Ill., assigner to Wm. H.

Welsh Co., Inc., Chicago; lll., a corporation of Illinots Y Application November 16, 1954, Serial No. 469,088 1 Claim. (Cl. 2311-275) This invention relates generally to electrically driven rotary fans for circulating air and more particularly to protective guards for the blades of such fans.

It is well known that the blades of an electric motordriven rotary fan are usually made of relatively rigid metal and as such are a source of danger to objects or human beings coming into contact therewith. Attempts have been made in the past to form such blades of a resilient material such as rubber in order to prevent the hazard of metal blades. However, this has been found to impair beyond practical limits the efficiency of the fan, and most fans in popular use have metal blades with a wire guard inthe form of a grill or frame around the blades in order to provide some measure of protection during operation. However, further protection is often desirable since such a frame is frequently not of fine enough mesh for fans used where children may be present or where window curtains, clothing, or the like may be in proximity to the fan.

Accordingly, it is an object of the present invention to provide a simple and inexpensively formed auxiliary guard for the blades of a fan.

Another object of the invention is to provide a protective guard for fan blades which may be used with different fans and even fans of differing sizes.

Still another object of the invention is to provide a protective guard for fan blades which furnishes adequate protection for such blades Without unduly reducing circulation of air thereby.

Yet another object of the invention is to provide an auxiliary guard for the blades of a fan which resists accumulation of dirt but which may be easily cleaned should the need arise.

A feature of the invention is the provision of a flexible cotton net of selected mesh size and roughly formed into the shape of a sack with drawing means about the opening thereof so that the net may be secured to the wire frame surrounding the fan blades of a usual electric motor-driven rotary fan as an auxiliary guard for such blades.

`Another feature of the invention is the provision of such a flexible net impregnated with plastic to render it somewhat stiff for improving thevprotective function and rendering it impervious to dirt.

Still another feature is the provision of a piece of exible netting with variable means for attaching the netting to the wire frame which usually surrounds the fan blades of a rotary electric fan in order to permit use of the netting on fans of different sizes as an auxiliary guard therefor.

Further objects, features and the attending advantages thereof will be apparent upon consideration of the following description when taken in conjunction with the accompanying drawings in which:

Fig. 1 is an exploded View of a rotary electric fan and the auxiliary protective guard;

Fig. 2 is a perspective view of a rotary electric fan with the protective guard of the present invention installed thereupon;

Fig. 3 isa rear view of the protective guard; and

Fig. 4 is a rear view of an alternate construction of the protective guard.

In practicing the invention there is provided an auxiliary protective guard for a fan. The guard comprises a exible net formed roughly into the shape of a sack so that it may be placed around the wire grill or frame surrounding the blades of a fan, and secured in such a position by a suitable drawstring. This flexible net may also be irnpregnated with plastic material to provide increased stiffness and to reduce any tendency for soiling.

The fan 10 shown in Fig. 1 includes a pedestal base 12 and a suitable driving motor 14 to which is secured a protective wire or grill work 16. The blades 17 of the fan are rotated within the frame 16 which provides some measure of protection for objects near the fan. Further pro tection is provided by installing the auxiliary protective guard 18 of the present invention. This is done by merely placing the open end of the guard which is roughly formed into a sack, over the frame 16 of the fan and then tightening the drawstring 20 and tieing the same to secure the guard 18. The fan will then appear as shown in Fig. 2.

In forming the guard of the invention it has been found preferable to cut a disc of material which is large enough to cover the frames of fans throughout a size range with which the guard of the invention is intended to be used. One type of material which was found suitable is cotton fishnet with 5%; inch mesh and having a yield of 73 square feet per pound. This forms a guard suitable for many purposes, although a mesh of larger or smaller size may be utilized, depending upon the protection necessary and the permissible reduction and diffusion of air circulation. The drawstring 20 may be threaded through the circular disc of netting at the periphery thereof after which it may be drawn up and will appear as shown in Fig. 3.

It is preferable to impregnate the disc of netting with a suitable plastic material in order to increase the stilness thereof and to provide a smooth surface so that dirt will not accumulate thereon and so that the guard may be easily cleaned should such be necessary. A plastic suitable for this material consists of a 20 percent solution of polymer C3V20M dissolved in a solute of methanal. (Polymer C3V20M is a product of the Monsanto Chemical Company, Springfield, Mass.) The netting may then be dipped in such a solution and dried at F. to drive out the solute. Squeeze type rollers may also be used to remove any excess of the plastic solution accumulated in the dipping process. It is obvious that other types of material may be successfully used to impregnate the netting, and the named method is given merely by way of example.

As shown in Fig. 4, it is also possible to attach the drawstring 22 to the fan guard 16 by means of a suitable tape 26 sewn around the netting. It would also be possible to secure the protective guard to the grill work of a fan by means of suitable clips and tension springs extending across the rear of such grill work.

As is apparent the invention provides a highly satisfactory auxiliary guard for a fan in that it may be simply and inexpensively formed. Furthermore, such an auxiliary guard may be simply attached to a fan and a given protective guard may be utilized on fans of varying sizes since the drawstring arrangement as shown provides great flexibility in the attachment of the guard. Of course, it is possible to form the guard of material having various mesh sizes so that the desired degree of protection is easily obtained. The auxiliary guard is also rendered entirely practical since it may be stffened and rendered impervious to dirt by impregnation with a suitable plastic which plastic may be of any desired color thus providing aesthetic appeal.

The invention provides, therefore, a highly satisfactoryr auxiliary protective guard for a rotary, motor-driven, electric fan.

I claim:

References Cited in the le of this patent UNITED STATES PATENTS Taylor Mar. 20, 1917 Jones June 28, 1927 Cook Mar. 25, 1930 Maxedon et al Apr. 16, 1935 Hoff et a1 Apr. 7, 1936 Talrnadge I an. 30, 1940 Selah Sept. 18, 1956 OTHER REFERENCES Electrical Merchandising (page 3), February 1950.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1219790 *Mar 1, 1916Mar 20, 1917Robert G TaylorAdjustable table-top cover.
US1633988 *Sep 2, 1926Jun 28, 1927Jones GeorgeProtector for glass and metal door knobs and automobile handles
US1751793 *Sep 21, 1928Mar 25, 1930Cook Emma KFan protector
US1997738 *Nov 20, 1934Apr 16, 1935Donald PennSteering wheel cover
US2036478 *Sep 8, 1933Apr 7, 1936Ada HoffGuard for motor driven fans
US2188488 *May 11, 1939Jan 30, 1940Silex CoFilter and the method of making the same
US2763428 *Oct 1, 1954Sep 18, 1956Selah Robert DFan safety guard attachment
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2923463 *Jul 13, 1956Feb 2, 1960Shunkwiler Eva NFan guard
US3262638 *Jan 20, 1964Jul 26, 1966American Allsafe CoOpen mesh fabric fan guard
US3564308 *Jul 30, 1968Feb 16, 1971Robbins & MyersBurn preventing foraminate material arrangement on electric motors
US3704738 *Aug 18, 1971Dec 5, 1972Tingley Rubber CorpCapstan type winch cover
US4047550 *Feb 23, 1976Sep 13, 1977Standun, Inc.Packaging wrapper
US4441392 *Nov 4, 1981Apr 10, 1984Georgia-Pacific CorporationCut web material dispenser with web centering and tension control
US4889543 *Dec 8, 1988Dec 26, 1989Burt Jerry DAir filtering system
US4898516 *Feb 16, 1989Feb 6, 1990Hendricks Debra SProtective fan shield
US5050654 *Jul 16, 1990Sep 24, 1991Howell James KUmbrella table cover
US5725356 *Dec 23, 1996Mar 10, 1998Carter; C. MichaelPortable fan device
US5809800 *Sep 9, 1996Sep 22, 1998Deal; Patrick J.Removable debris filter for an air conditioning condensing unit
US5868189 *May 9, 1997Feb 9, 1999Jarvis; Robin A.Protective cover for a portable electric fan
US6045329 *Jun 8, 1998Apr 4, 2000Sobala; RandyFan filter
US6213718Apr 27, 1998Apr 10, 2001Emerson Electric Co.Air circulation fan with removable shroud
US6780216 *Jul 18, 2002Aug 24, 2004Erik KiilunenAir filter for computers
US7393272 *Dec 29, 2004Jul 1, 20083M Innovative Properties CompanyAir filter assembly
US8100652 *Jul 14, 2008Jan 24, 2012Bauer Steven MCeiling fan complete cover
U.S. Classification416/247.00R, 416/146.00R, 150/154
International ClassificationF16P1/00, F04D29/70, F04D29/00, F16P1/02
Cooperative ClassificationF04D29/703, F16P1/02
European ClassificationF04D29/70C2, F16P1/02