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Publication numberUS1272931 A
Publication typeGrant
Publication dateJul 16, 1918
Filing dateFeb 1, 1918
Priority dateFeb 1, 1918
Publication numberUS 1272931 A, US 1272931A, US-A-1272931, US1272931 A, US1272931A
InventorsHalls B Etheridge
Original AssigneeHalls B Etheridge
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1272931 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




1 ,272,931 Patented July 16, 1918 2 SHEETS-SHEET1.

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1 ,272,931. Patented July 16, 1918.


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Specification of Letters Patent.

Patented July 16, 1918.

Application filed February 1, 1918. Serial No. 214,895.

To all whom it may concern:

Be it known that I, HALLS B. ETHERIDGE, a citizen of the United States, residing at Gilmerton, in the county of Norfolk and State of Virginia,have invented certain new and useful Improvements in Foot-Warmers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide a simple and inexpensive, yet a highly efficient device for use in boots and shoes to warm the users feet and maintain them at a comfortable temperature by compressing air until it is heated and expelling such heated air into the shoes, the device being operated solely by the motion of walking.

With the foregoing general object in view the invention resides in the novel features of construction and unique combinations of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specification and in which:

Figure 1 is a vertical longitudinal section, partly in elevation, of a shoe equipped with the invention and illustrating the air compressing piston in lowered position;

Fig. 2 is a horizontal section on the plane of the line 22 of Fig. 1;

Fig. 3 is a duplicate of Fig. 1 with the exception that it illustrates the heel of the shoe raised and the compressor piston on its return stroke;

Fig. 4 is a transverse section on the plane of the line 14 of Fig. 1; and

Fig. 5 is a similar view on the plane indicated by the line 55 of Fig. 1.

In the drawings above briefly described, the numeral 1 designates a hollow insole extending from the heel of the shoe substantially beneath the instep although it could be of any preferred length. The insole 1 is closed at its rear .end as shown at 2, whereas its front end is provided with one or more restricted air outlet openings 3. The lower side of the insole, near its rear end, is formed with a pair of air inlets 4 with which a pair of vertical passage members 5 communicate, said members also communicating with air discharge openings 6 of a pair of vertical air compressing cylinders 7 which, together with said passage members, are inset in the heel of the shoe.

Pistons 8 are mounted in the cylinders 7 and are provided with vertical piston rods 9 whose upper ends are pivoted or otherwise suitably connected at 10 to a vertically moving operating member 11 which is preferably in the form of a flap pivoted to the insole at its front edge as shown at 12, said flap overlying the rear end 13 of the bottom of the insole, said end projecting beyond the top of said sole and carrying the cylinders 7. Springs 14 are preferably employed for raising the pistons 8 when the persons weight is relieved from the flap 11 as shown in Fig. 3 and these pistons are so constructed that upon each upward movement thereof, they admit air into the lower ends of the cylinders 7. It thus follows that when the flap 11 is lowered by theusers weight as will be clear from Fig. 1, the air will be compressed in said cylinders and discharged into the hollow insole 1 from which it will be expelled through the restricted outlet 3. By continuously compressing the air in this manner, it becomes highly heated so that the entire insole is filled with hot air and maintained at a comfortable temperature even in the coldest weather.

The device is simple and inexpensive, yet will be highly efficient for the purposes intended. Any preferred material may be used in the construction of the improved warmer, but I preferably employ copper throughout and in most cases a covering 15 of felt, wool or any other suitable soft and pliable material will be provided for the insole 1 and the flap 11 to prevent the device from possibly interfering with the comfort of the user.

From the foregoing, taken in connection with the accompanying drawings, it will be obvious that a novel device has been created for carrying out the objects above set forth, and that such device will be highly efiicient and durable. Since probably the best results are obtained from the several specific details shown and described, these details are by preference employed, but within the scope of the invention as claimed, numerous minor changes may well be made.

I claim:

1. The combination with a shoe, of a foot warmer therein comprising an air com- Presser operated, y the motion of elklng,

said compressor having restricted. air outlet means into the shoe and having relatively large air inlet means independent of saidoutlet means.

2. The combination with a shoe, o1": a hollow insole in said shoe having restricted air outletlmeans, an air compressor inset in the sh'oe heel'and having a vertically movable heel-actuated operating member, anda passage leading from said compressor to said hollow insole.

3. A foot warmer comprising a hollow insole having air outletmeans; an air compressor depending'from the rear end of said insole and having a vertically moving heelactuated operating member at the upper side of said sole, and a passage from said compressor to said hollow sole.

inder having an upstanding piston rod, :1

vertically swinging heeloperated=flap pivoted to said insole and connected" to the upper end'of saidrod, and a passage from the lower end of said cylinder into said hollow insole. 1

In testimony whereof I have hereunto set my hand" in the presence oftwo subscribing witnesses. f

HALLS B. ETHERIDGE. WVitnesses: i '7 GEO. D. LAwRANoE,


Copies of thin patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2991764 *Feb 17, 1959Jul 11, 1961Eugene SarkanFluid agitation type heater
US3475836 *Feb 29, 1968Nov 4, 1969Brahm HarryAir pumping insert for shoes
US4736530 *Feb 17, 1987Apr 12, 1988Nikola LakicShoe with heat engine and reversible heat engine
US4756095 *Jun 23, 1986Jul 12, 1988Nikola LakicFootwarmer for shoe
US6255799 *Dec 29, 1999Jul 3, 2001The Johns Hopkins UniversityRechargeable shoe
US7775204 *Jan 5, 2007Aug 17, 2010Long Ho ChenWarming shoe pad
US8087409 *Feb 4, 2009Jan 3, 2012Chun-Yen KungHeater for footwear
US8632481 *May 5, 2011Jan 21, 2014Shenzhen Futaihong Precision Industry Co., Ltd.Therapeutic shoe
US8970054 *Apr 29, 2013Mar 3, 2015Sole Power, LlcFoot-powered energy harvesting mechanisms for insoles and shoes
US20120260531 *May 5, 2011Oct 18, 2012Fih (Hong Kong) LimitedTherapeutic shoe
US20140145450 *Apr 29, 2013May 29, 2014Matthew James StantonFoot-powered energy harvesting mechanisms for insoles and shoes
U.S. Classification36/2.6, 126/204, 126/247
International ClassificationA43B7/02
Cooperative ClassificationA43B7/02
European ClassificationA43B7/02