US1985965A - Electric resistance heating element - Google Patents

Description

Jan. 1, 1935. E. 1.. WIEGAND ELECTRIC RESISTANCE HEATING ELEMENT Filed Jan. 8, 1932 Z Lwl'egalzd Patented Jan. 1, 1935 p s i UNITED STATES PATENT OFFICE ELECTRIC nnsrsmncn HEATING ELEMENT Edwin L. Wiegand, Pittsburgh, Pa. Application January s, 1932, Serial No. 585,493,

19 Claims. (Cl. 201-47) This invention relates to sheathed electric edges of the companion member 6 to secure the heating elements, and the principal object of the sheath in position surrounding the body 2. invention is the provision of sheathed electric In the element of Figure 5 the companion heating elements having increased rigidity and member 6 is omitted, and the lips 5 engage di- 5 resistance to warping or other deformation. The reetly with the one face 1, of t dy d t invention is applicable whether the sheath Sheath 2 overlies only one face of the body encloses entirely or only partly, and is particu- 2, and theflthel face 10 0f the dy 2 is p larly applicable to sheathed electric heating between the lips 5. elements of the type disclosed in my United In each of the Elements O ur 1 o h 4 states Patents 1,613,426, 1,614,330, 1,614,331, and the sheath 8 is p v d n each of its face mm 10 1,614,938, that is, to sheathed el ctric heating eltions 3 and 6 with pr d ru a ions 7, and ements comprising a resistor enclosed in a body in the element of Figure 5 the Sheath 12 is p of electrically-insulating heat-conducting mate- Vided With impressed fl a ons 3 Over its rial wholly or partly enclosed by a metal sheath single f i each of th men s of Fi u s 15 supporting and protecting the body and acti 1 through 4 the corrugations 7 are straight, and 15 as a heat-transfer surface for the element, and depressed inwardly, Shown, a d in he elein this a lication I have illustrated my invenmerit of Figure 5 t u a i ns 13 ar h ok d, tion embodied in heating elements of that type. and raisedo d y- In the drawing accompanying this specifica- I prefer, however, that the r u t ons be tion and forming a part of this application: straight, and 3 that the corrugations be de- 20 Figure 1 is a view in perspective, showing a pressed inwardly, in order not substantially to ring element of that type and embodying my 1m impair the contact between the surface of the vention, sheath and a cooking vessel or other article to Figure 2 is a similar view, but showing a strip be heated, or air or other flu d flow across element, the surface. 25

Figure 3 is a second view f, th el t, of In each element the corrugations are at an Figure 2, showing the element the other side up, angle o e length (lithe element (in the r Figure 4 is a iew similar to Figure 3, "but unit, 50 the circumference), to strengthen and showing a curved element, and may be t k a stiffen the face of the sheath, and to allow a fragmentary view of a portion ofthe element 1701 expansion in the direction of the length, 30 of Figure 1, showing the element the other side and in the elements of Figures 'm 4 the andcorrugations of the two faces 3 and 6 are in- Figure 5 is a view in perspective, illustrating dined relatively fipp y, to Secure even the application of the invention to an element greater rigiditywherein the sheath only partially encloses. the fillegoing it will be apparent, that 35 Each of the heating elements herein shown the elements herein wn are of greater rigcomprises a resistor La body 2 of cementitious idiliy and 1135151331109 t0 deformation, a d aeelectrically-insulating heat-conducting material wrdihgly, that my invention does accomplish embedding the resistor 1, and a sheath wholly a l a t s principal pu p H w v it is to 40 or partly enclosing the body 2, and in h i be understood that the invention is not limited 4Q stance the resistor 1 is in the form of a ribbon, t0 the particuifll heating elemehtS yp o disposed sinuously in the body 2. heating elements herein shown, or to the particuni'th l t of Figures 1 through 4 t lar forms herein shown, but may be otherwise sheath 8 is two-part, entirely surrounding the embodied, has uses and a es, body 2, and consists of a channel member s and and eeeerdnisly e dlseleeure herein is o b 45 a cooperating companion member 6, and in each regarded as llltl-stlatlve on y, and the invention of these elements the companion member 6 is is not limited theretomerely a wide flat metal strip overlying one face av thus described my inv ntion what I 10 of the body 2, and the channel member 9 is a claim r151 metal member having a wide flat portion 3 over-- 1. An electrical resistance heating element 50 lying the other face 10 of the body 2, having edge comprising a resistor of flat formation arranged portions 4 rising from the edgesof the flat perto present heating areas of considerable expanse, tion 3 and overlying the sides 11 of the body 2, a metal sheath adjacent said resistor and spaced and havingalso lips 5 inturned from the free therefrom, substantially co-extensive with said edges of the edge portions 4 and overlying the heating areas and continuously subject to the 55 influence of said resistor, and a compact mass of refractory, electrically non-conducting material filling the space between said resistor and sheath, said sheath having reinforcing corrugations embossed therein and projecting into said non-conducting material.

2. An electrical resistance heating element, comprising: a resistor; a sheath at least partly embracing said resistor; and electrically nonconductive material insulating said sheath from said resistor; said sheath having an operative surface provided with spaced corrugations depressed inwardly thereof, providing said opera tive surface with flat surfaces of substantial area between said corrugations, whereby the hat surfaces are adapted to contact the article to be heated.

3. An electrical resistance heating element, comprising: a resistor; a sheath at least partly embracing said resistor; and electrically nonconductive material insulating said sheath from said resistor; said sheath having a plurality of operative surfaces provided with spaced corrugations depressed inwardly thereof, providing said operative surfaces with flat surfaces of substantial area between said corrugations, where by the flat surfaces of any one of said operative surfaces are adapted to contact the article to be heated.

4.1 m electrical resistance heating element, comprising: a resistor; a sheath at least partly embracing said resistor; and electrically nonconductive material insulating said sheath from said resistor; said sheath having operative surface provided with spaced corrugations depressed therein, projecting into said non-conductive material, providing said operative surface with fiat surfaces of substantial area between said corrugations, whereby the flat surfaces are adapted to contact the article to be heated.

5. An electrical resistance heating element, comprising: a resistor; a sheath at least partly embracing said resistor; and electrically nonconductive material insulating said sheath from said resistor; said sheath having a pair of oppositely disposed operative surfaces provided with biased spaced corrugations depressed inwardly thereof, and the corrugations of the opposite operative surfaces inclined in opposed diagonal directions. said cor'ugations being arran ed to provide op tivc surfaces with fiat surfaces of substantial area therebetween, whereby the flat surfaces of one of said operative surfaces adapted to contact the article to be heated.

6.1m electrical r ce heating element, comprising: a resistor; a sheath at least ,artially emhra ng resistor; said being provided vii. i. a. plurality of con .gations, disposed at a substantial angle to the length thereof effective both to strengthen said sheath transversely and to take up longitudinal expansion.

7. An electrical resistance heating element, comprising: a resistor; and a sheath at least partially embracing said resistor; said sheath being provided with a plurality of corrugations, disposedat a substantial angle to the length thereof substantially less than a right angle and effective both to strengthen said sheath both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

8. A relatively flat electrical resistance heating element, comprising: a resistor; and a sheath embracing said resistor on at least one of the two fiat sides of the element; said sheath being provided in its flat face with a plurality of corrugations, disposed at a substantial angle to the length thereof effective both to strengthen said face transversely and to take up longitudinal expansion.

9. A relatively flat electrical resistance heating element, comprising: a resistor; and a sheath embracing said resistor on at least one of the two flat sides of the element; said sheath being provided in its fiat face with a plurality of corrugations, disposed at a substantial angle to the length thereof substantially less than a right angle and effective both to strengthen said face both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

10. A relatively flat electrical resistance heating element, comprising: a resistor, and a sheath embracing said resistor on both of the flat sides of the element; said sheath being provided in each of its flat faces with a. plurality of corrugations, disposed at a substantial angle to the length thereof substantially less than a right angle and inclined oppositely to the corrugations in the other face and effective both to strengthen said faces both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

11. An electrical resistance heating element, comprising: a resistor; and a sheath at least partially embracing said resistor; said sheath being provided with inwardly depressed spaced corrugations, leaving therebetween contact surfaces of considerable area, adapted to be engaged by an article to be heated.

12. A relatively flat electrical resistance heating element, comprising: a resistor; and a sheath embracing said resistor on at least one of the two fiat sides of the element; said sheath being provided with inwardly depressed spaced corrugations, leaving therebetween flat contact surfaces of considerable area, adapted to be engaged by an article to be heated.

13. An electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat conducting material embedding said resistor; and a metal sheath at least partially enclosing said body; said sheath being provided with a plurality of corrugations, dis posed at a substantial angle to the length there of effective both to strengthen said sheath transversely and to take up longitudinal expansion.

14. An. electrical resistance heath clement, comprisin a resistor; a body el ct' callyinsulatin heat-conducting material dding tor; and a sheath at least partially i said body; said sheath bein provided with a plurality of corrugations, disposed at a substantial angle to the length thereof substantially less than a right angle and effective both to strengthen said sheath both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

15. A relatively fiat electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat-conducting material embedding said resistor; and a sheath enclosing said body on at least one of the two flat sides of the element; said sheath being provided in its flat face with a plurality of corrugations, disposed at a substantial angle to the length thereof eflective both to strengthen said face transversely and. to take up longitudinal expansion.

16. A relatively flat electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat-conducting material embedding said resistor; and a sheath enclosing said body on at least one of the two fiat sides of the element; said sheath being provided in its flat face with a plurality of corrugations, disposed at a substantial angle to the length thereof substantially less than a right angle and effective both to strengthen said face .both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

17. A relatively fiat electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat-conducting material embedding said resistor; and a sheath enclosing said resistor on both of the flat sides of the element; said sheath being provided in each of its fiat faces with a plurality of corrugations, disposed at a substantial angle to the length thereof substantially less than a right angle and inclined oppositely to the corrugations in the other face and effective both to strengthen said faces both transversely and longitudinally and also to take up both transverse and longitudinal expansion.

18. An electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat-conducting material embedding said resistor; and a sheath at least partially enclosing said body; said sheath being provided with inwardly depressed spaced corrugations extending into said body, said corrugations leaving therebetween contact surfaces of considerable area, adapted to be engaged by an article to be heated.

19. A relatively flat electrical resistance heating element, comprising: a resistor; a body of electrically-insulating heat-conducting material embedding said resistor; and a sheath enclosing said body on at least one of the two flat sides of the element; said sheath being provided with inwardly depressed spaced corrugations extending into said body, said corrugations leaving therebetween fiat contact surfaces of considerable area, adapted to be engaged by an article to be heated.

EDWIN L. WIEGAND.

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