US1087198A

US1087198A - Electric heating unit.

Info

Publication number: US1087198A
Application number: US80062713A
Authority: US
Inventors: Clarence S Steward
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-11-12
Filing date: 1913-11-12
Publication date: 1914-02-17
Anticipated expiration: 1931-02-17

Description

C. S. STEWARD.

ELEGTRIC HEATING UNIT.

APPLICATION FILED NOV. 12, 1913.

Patented Feb. 17, 1914.

qmitnewm I face adapts for use in provided upon opposite sides with trunmons UNITED STATES PATENT OFFICE.

OLAIENCE S. STIWARD, 0F CHATTANOOGA,'

ELECTRIC H EATING UNIT.

Specification of Letters 2mm. P tented Feb, 1'7, 1914.

12, 1918. Serial (L 800,827.

To all whom it may concern: a

Be it known that I, CLARENCE S. STEWARD, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Electric Heating Units; and I do hereby 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, reference being had to the accompanying drawings, and to thealettersand figures of reference marked thereon, which form a part of this specification. f

This invention relates to certain new and useful. improvements in heating units for electric heaters and it has for its object the provision of a unit of this character constructed of suitable noncombustible insulating material of any desired shape and having one of its faces provided with grooves disposes in parallel relationship, the said grooves being wider at the bottom than at the top and being designed to receive a resistance wire, either coiled or in other form, the portion of the groove receiving-the wire being of greaterdiameter than the width of 'the slot ilrthe surface. of the unitso'that the resistance wire will at all times be retained against possible accidental displacement.

The invention has for a further object the provision of a heat unit of the character described in which theresistance wire is so disto afford the greatest possible efiiciency 1n givin of heat direct radiation and im rt tions 0 the p ate interposed between t e resistance coils, which rtions are brought into direct contact with the article to' be heated.

A further objectof the invention resides inthefprovision of a heat unit of the characterdescribed which is imperforate and in which meang is provided for. detachably securing the resistance wire without the use of plates, bolts, screws or ozher mechanism which is not embraced in th constructionof. the device itself and in which the rear face of the unit presents a-uniforml smooth surto be used as a griddle, suitable baking cakes, etc., the unit being which permit the unit to be lifted from position and reversed so that its cooking surface eat to the overhangin porcan be brought into position for use incookclosed through the trunnions as the unitis removed or replaced.

A further and essential object of the inventlon consists in the provision of a unit of secure a combination by means of which it is possible to heat any vessel or article when the same is placed upon the unit by means of the radiation fromthe wireand by concom osed.

. hile I have shown in heat unit circular in form, it will at once be evident that, if desired, it may be rectangular or other preferred shape, the unit being preferably constructed of steatite or soapstone, as the character of this material is such as to best adapt it for the purpose. To these ends and to such others as the inventlon may pertain, the same consists in the novel construction of the heat unit and in the pee lliar arrangement, combination and adaptation of parts, all as will be more fully hereinafter described, shown in the accompanying drawings and then specifically defined in the appended claims.

The invention is clearly illustrated in the accompanying, drawings, which, with the numerals of reference marked thereon,- form a art of this specification and in.wli1ch:-

embodying the features of my invention. Fi 2 is a section upon line 2-2 of Fig. 1, an Fig. 3 is a detail sectional -view taken-on line 33 of Fig. 1. i

Reference now being had to the details of the I drawings by numeral, 1 desi ates a disk, constructed preferably of steat te, soapstone, or other noncombustible material adapted for the purpose. Disposed at intervals, and extending transversely acrm one face of the disk is a series of

parallel grooves

2, 2. These grooves are open at their ends and have theirlower portions milled to form an enlarged .part 3 for the in ose of receiving the resistance wire 4.

acli alternate end of each of the bars 5, separatin the slots 2, is cut away as shown at 6, 6, -t said cut away portions 6' being provided with a lug or stop 7, the upper face of which stop is disposed above the horizontal plane taken through the lower surface of the bottom of the slots.

ing, the electric circuit. being opened .or'

the character described so constructed as to tact with the material of which the nnit is the drawings a igure 1 is a top plan view of a heat unit end was attached.

It will be observed that the resistance wire t comprises a single continuously Wound wire having its ends secured to the

trunnions

8,8 by means of suitable binding screws 9. By the construction described, it will be seen that the seatin of the wire within the slots is readily e ected by first attaching an end of the wire to the trunnion upon one side thence, when the Wire is carried to the open end of the slots at the termination of the bar separating the first and second slots, it may be bentaround the bar separating said" slots and is then carried to the opposite end where the depressed portion 6 admits of the wire being carried around into the next'succeeding slot and thence alternately carried from oneeslot to another by means of the open spaces 6 which are provided at the ends of each alternate set of slots. \Vhen thus threaded and in place, the opposite end of the wire is clamped to the trunnion upon, the side of the unit opposite to that at which the first It will be seen that, when the resistance wire is-thus seated within the slots provided for its reception, it

will be effectually protected or locked in position against accidental displacement and will at all times be retained below the' sur-. face of the disk, while the overhanging edges of the bars separating the slots will form a means for quickly receiving heat from the Wires and transmit the same to the body of the bars. It will also be noted that in the construction which I have described the disk is imperforate, no means being required for placing or retaining the resistance wire in position, other than that provided in-the construction of'the unit itself and it will be further noted that by this construction the face of the unit opposite that which is provided with the slots carrying the resistance wires, being imperforate, forms a smooth and uniform surfaceadapted for use for cooking purposes. \Vhen the unit is designed for heating purposes, these trunnions are placed within their bearings, which are provided with means whereoy a current is established with the wire. vWhen itiis desired to reverse the plate so as to present its rear face, it is simply necessa to lift the unit from its bearings and, a ter reversing it, to again restore the trunnions to their ournal bearings when the current will be reestablished and the heat imparted by the wires will be transmitted to the'disk. It will be noted that in reversing the plate, the wires will be at all times securely retained within the slots in which they are seated and that no provision whatever, Otherthan described, will be re quired inorder to retain the wires in place. Having thus described my invention,

same comprising an imperforate body portion or a disk having chambers within the body portion thereof, said chambers being arranged in parallel relation and of a size and form adapted for the reception of a resistance wire, a series of open slots arranged in parallel relationship with the chambers, said unit being so constructed that it. ma be reversed in position so as to present eit ier a uniform surface or the chambered surface, substantially as shown and described.

SJA reversible heating unit for electric heaters, the 'samecomprising, in combina tion, an lmperforate dlsk having incorporated thereln a series of chambers adapted to receive a resistance wire, said chambers being separated by bars integral with the disk, the edges of the bars overhanging the wire receiving chambers, each alternate bar being cut away to form open slots, said chambers being provided with wire retaining lugs, means upon opposite sides of the unit for securing the ends of the wire, and means substantially as described for auto matically making and breaking the circuit and communicating,

in reversing the unit, substantially as shown and described.

4. A heating unit for electric heaters, the same comprising an imperforate body ortion or dlsk provided with a series 0 resistance wire chambers dis osed in parallel relationship and arranged low the surface of the disk, the said chambers being so disposed as to permit the continuous winding of a resistance wire throughout the series of chambers, slots of less width than the width of-the chambers, said slots communicating with'the face of the disk, means integral with the body portion of the disk and below the surface thereof adapted, to prevent the movement of the wire in either direction within the chambers, substantially as shownvand described.

In testimony whereof I'hereunto afiixmy signature in presence of two witnesses.

CLARENCE S. STEWARD.

Witnesses: I

A. FOWLER- 9 FRANKLIN H. Houom,