US1475760A - Inclosed range-heating unit - Google Patents

Description

Nov. 27, 1923. 1,475,760

c. J. FAY

INCLOSED RANGE HEATING UNIT Filed Oct. 20 1921 Patented Nov. 27, 1923. I g UNITED STATES PATENT OFFICE CARL J. FAY, OI MANSFIELD, OHIO, ASSIGNOR TO WESTINGHOUSE ELECTRIC PROD- UCTS COMPANY, A CORPORATION OF MICHIGAN.

mcnosnn RANGE-HEATING Um'r.

Application filed October 20, 1921. Serial No. 509,090.

. To all wfwm it may concern:

Be it known that I, CARL J. FAY, a citizen of the United States, and a resident of Mansfield, in the county of'Richland and State of Ohio, have invented a new and useful Improvement in Inclosed Range-Heating Units, of which the following is a specification.

My invention relates to electrically heated apparatus and particularly to electrical heating elements and it has for its object to produce an inclosed electric range-heating element.

In practicing my invention, I provide a refractory plate having a groove in one of its faces within which is located a resistor. A metallic casing is provided with a heatinsulating member at its bottom, against which is placed the bottom surface of the refractory plate, a relatively heavy cover plate being located at the upper part of the casing to operatively engage the grooved surface of the refractory plate. Terminal bars are located outside of the bottom of said casing and extend parallel thereto, their inner ends being suitably connected to the resistor member and their outer ends extending a short distance beyond the periphery of the casing. A suitable clamping means serves to hold the outer end of each 7 of the terminal bars in proper operative position relatively to said casing.

In the single sheet of drawings, Flgure 1 .is a view, partly in side elevation and partly provided, in one of its flat surfaces, with 12 may be of any suitableor desired contourin'lateral cross section to permit of main-- one or. more spiral grooves 12 in which is located a resistor member 13, which is here illustrated as comprising a helix of a suitable reslstor wire. The groove or grooves taining the resistor in its position therein.

A metallic casing 14: is in the form of a proper operative shallow. dish of relatively thin metal, its

contour being suchas to conform to the contour of the plate 11. The inner diameter of the side wall 15 is slightly greater than the outer diameter of the plate11 to rovide a small clearance 16 therebetween.

he bottom of the plate 11 is spaced from the innerbottom surface of the member 14 by a layer 17 of any suitable heat-insulating material, such as asbestos. A relatively thlck metal plate 18 is located immediately adjacent the upper surface of the plate 11, and its outer periphery engages the inner surface of the outer portion of the side wall 15. If necessary, ordesirable, stiffening ribs 19 may be formed on the bottom surface of the casing 14. A plurality of screw bolts 21 pro ect through suitable registering openings in the plate 18, the plate 11 and the casmg 14 and are provided with nuts 22 to securely hold these members in their proper operative positions relatively to each other.

A plurality of terminal bars, 23, 24 and 25, are located in a plane parallel to the heat ing element and extend from diametrally alined points thereon. I have illustrated three terminal bars, as it is intended to connect portions of the resistor element in series and in parallel-circuit relation, respectively, to generate different degrees of heat. The inner ends of the terminal bars 23 and 25 are spaced from the layer 17 by a suitable conducting block 26, relatively large openings 27 being provided in the bottom of the casing at the periphery thereof. The inner end of the terminal bar 24.- is also spaced from the layer 17 by the conducting block 26 for which a relatively large opening 28 is provided. A screw 29 and a nut 30 serve to operatively connect the inner end of each of the terminal bars to the resistor. The outer ends of the bars extend substantially parallel to each other and project through openings 31 in a member 32 of suitable insulating material which is secured against the under surface of the casing 11 by means of a single resilient clamping member 33 substantially of U-shape, the outer ends of which are secured by means of screws 34 and nuts 35. The terminal bars illustrated in the drawing are not specifically parts of my invention but are covered in a copending application, Serial No. 480,276, filed by Frank F. Forshee, June 25, 1921, and assigned to the Westinghouse Electric Products Company.

The small clearance 16 between the outer side wall casing, and the heat-insulating la-yer 1? located between the bottom of the plate and the casing also reduces the heat flow between the twomembers. The relatively thin metal of the casing reduces the amount of heat which may be stored therein and radiation therefrom may be reduced by suitably polishing or even plating the outer surface. The relatively heavy member 18 provides a heat-receiving, heat-equalizing and heat-radiating member which has a relatively large heat-storage capacity.

The construction herein disclosed provides a totally inclosed heating element effective to distribute the heat over the entire surface of the upper surface-plate of the element and to protect the resistor against any liquid or food boiling over from the cooking vessel placed thereon.

Various modifications may be made in the device embodying my invention Without departing from the spirit and scope thereof and I desire that only such limitations shall be placedthereon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim 'as my invention 1 1. In a totally inclosed heating element, in combination, a refractory resistor-supporting member, a radiant resistor supported thereby, a relatively heavyheat-receiving and heat-radiating member adjacent said radiant resistor, a dished relatively thin metallic casing substantially enclosing said refractory member, means for reducing the heat flow between said refractory member her, a resistor located in said groove. a relatively thin metallic casing of dish shape in which said refractory member is located, means for reducing the flow of heat from said refractory member and said resistor to said casing, a relatively heayy-heat-receiving and heat-radiating plate engaging the grooved surface of said refractory member and means for securing said plate, refractory member andheat-fiowreducing means in said casing.

3. In a totally inclosed heating element, in combination, a grooved refractory memher, a resistor located in said groove, a relatively thin metallic casing'of dish shape in Which said refractory member is located, means for reducing the flow of heat from said refractory member and said resistor to said casing, a relatively heavy heat-receivgrooved surface of said refractory member, erminal bars for said resistor, and means for securing said plate, refractory member,

heat-flow-reducing means and said terminal bars against said casing.

In testimony whereof, I have hereunto subscribed my'name this 17 day of Oct. 1921.

CARL J. FAY.

mg and heat-radiating plate engaging the

Images