USRE20324E

USRE20324E - Oven light

Info

Publication number: USRE20324E
Authority: US
Publication date: 1937-04-06

Description

BEST AVAILABLE COPY April 6, 1937. HE Re. 20,324

oven LIGHT 407 Original. Filed Feb. 23, 1.934

INVENTOR. W W, BY

ATTORNEYa Reissued Apr. 6, 1937 UNITED STATES PATENT OFFICE OVEN LIGHT George lierbster. Cleveland. Ohio.

Cleveland Cooperative Stove Company.

asslgnor to The Cleveland. Ohio, a corporation oi Ohio Original No.

Application ior reissue May 2, 1935, Serial No. 19,480

7 Claims.

This invention relates to a device ior illuminating the interior oi ovens oi commonly used types oi household gas cooking ranges, the principal object being to provide a light in the oven 5 so positioned that the contents oi the oven are eiilciently illuminated.

Another object is to provide an electric light for this purpose which is lighted consequent upon opening at the oven door and is extinguished consequent upon closing oi the oven door whereby the liie oi the light bulb is increased and a saving in electric power is eiiected.

An equally important object oi the present invention is to provide an electric light ior an oven 5 which is so arranged that the parts thereoi that are apt to be damaged by heat are continuously bathed in cool outside air so as to be maintained at a-saie operating temperature and not be damaged by heatirom the oven.

In order that the oven may be well lighted and shadows eliminated it is desirable that thb light bulb protrude into the interior oi the oven and a more specific object thereiore is to mount a bulb in this manner and yet at the same time maintain the bulb shank and electric power socket associated therewith at a suilicientiy low degree of .temperature to prevent deterioration and to ei- I Fig. 3 is a back end .eievatlon oi the device illustrated in Pig. 2; and

Fig.4 is a iragmentary side elevation oi the control switch and the operating mechanism thereior.

Rcicr'ring to Figs. 1 and 2. there is illustrated a gas range having an oven-O. closed at the trout by. the usual drop doorv D and at the sides and 5 rear by theusual heat insulating walls arranged, ior-example. inthe same manner as the rear wall shown in section in Figs. l and 2. This rearwall comprises an inner w'ali'or lining A and an outer wall 8. spaced apart thercirom and a paras tition wail C disposed therebetwccn and spaced iect this result by conducting the heat oi the oven away irom the bulb and socket through a from both. a core E of asbestos or other suitable heat insulating material being provided between the partition wall C and the outer wall B.

In order to illuminate the interior oithe oven efllciently and without shadows it is desirable that 5 the electric light bulb protrude beyond the inner wall A into the interior of the oven 2. distance sutflcient to expose the filament oi the bulb entirely within the limits of the oven interior. An electric light bulb i oi the usual type is shown as so positioned in Figs. 1 and 2. the filament in being exposed entirely within the oven. The bulb is preferably positioned in the rear oi the oven compartment and near the ceiling thereof so as to light the interior of receptacles in the oven 15 and may be protected by an enclosing transparent shield, if desired.

The heat of the interior 'oi ovens, however, is 0! such a high degree as to dcletcrlously ailect the bulb. especially the bulb shank ic. which is screwed into the electric socket. Not only does the heating oi the shank melt the sealing wax therein and permit escape oi the inert gases within the bulb but also melts the solder contacts on the shank. It is necessary. therefore. that these portions of the bulb be kept relatively cool. In order to accomplish this result an electric socket 2 is arranged on the outside '0! the oven compartment in a position to receive the bulb shank lo and supply power to the bulb when the bulb is in the position described. Thus the socket is exposed to the cooler air outside oi the oven. circulation 01 air thercabout being efl'ecled in a manner later to be described.

For mounting the light and socket and cooling the same. a housing I! is provided. the housing preferably being in form. oi a cup oi emcicnt heat conducting material. such as copper or cast iron. In the form shown, the housing is provided with an end wall 4 and is open at the opposite end to admit outside air. Aligned openings are provided in the walls A. B and C oi the rear wall oi the oven and arranged to snugly receive the housing endwisc with the end wall 4 oi the housing prcierablydlsposed in the plane oi the inner suriace oi the wall A so as to receive the oven heat adjacent the housing and conduct it away. An opening is also provided in the end wall 4 oi the housing to permit the bulb to extcndthcrethrough. Mounted within the housing and in spaced relation to the side and end walls thcreoi is an electric light socket 2 connected in the usual manner to a suitable source of power. A convcnii-nt mounting ior the socket comprises a strap secured to the socket and, at its ends. secured to the housing 8 so as to support the socket out of contact. with any of the walls of the housing.

The socket is preferably disposed. at sufllcient distance back from the end wall 4 so that,.when the g buib' l is mounted therein. the shank of the bulb is entirely within the interior of the housing and does not extend into the oven.

A shield I of suitable heat insulating material is provided within. the housing and forms a lining m for the walk thereof. The shield has an opening for the passage of the bulb shank therethrough.

this opening preferably being of such size that the edges of the shield defining the opening engage the bulb close to the shank and thereby pre- 15 vent direct radiation of any considerable amount of heat through the opening of the wall I to the shank, The floor wall la of the housing preferably slopes downwardly away from the oven toward the outside so that theair may readily enter.

go as indicated by the arrows l. and flow upwardly through the interior of the housing and out'again near the-top. Thus the socket and. shank of the bulb are continuously bathed in iresh. relatively cool air. circulation being maintained by con- 25 vection currents resulting from the heat dissipated from the shank. socket and housing. Since the walk It and C have an appreciable surface contact with the metal-of the housing. a large amount of heat which enters the end wall l is consoducted through the metal and dissipated through the walls C and E. Part of such heat is also dissipated through the portions of the housing exposed to the outside air. Thus practically no heat reaches the shank and socket-except by conduction "as through the glass oi. the bulb i. This is readily dissipated by the air bath provided about the sockat and bulb shank within the housing 3.

In order to light the bulb automatically when the oven door is opened and to extinguish the bulb 40 automatically consequent upon closing of the oven door. a suitable snap switch I is provided.

this switch being connected in series with the socket and with a source oi power in the usual manner. Mounted within the oven is an operating lever or rod Q. one end of which. indicated at il. protrudes from the-forward wall oi the stove in position to be engaged and moved axially rearwardly by the oven door when the door is closed. The rod extends through the .oven and out 50 through the rear wall. on the outside which is mounted the switch I. A suitable bracket vii is provided on the rear wall B to support the switch and to sii'dably mount the opposite end of the rod.

Mounted on the rod-9, intermediate the wall 8 5 and the outermost arm of the bracket. is a yoke it, this yoke being iixed in position axially oi the rod so as to move therewith and being provided with an opening through which extends -the switch operating lever In. A spring is is interposedbetween the yoke l2 and the outermost arm of the bracket ii, the spring being compressed when the rod is moved to the right or rearwardly consequent uponclbsing of the oven door and being operable when the oven door is opened to reqg turn the rod forwardly or towardthe left. The

switch lever is so arranged that upon movcmcntof the rod rearwardly the switch is opened and.

upon .return of the rod I to the left. is closed.

Consequently the light is turned on when the oven 7 door is opened and is extinguished immediately upon closing of the door. The switch. being maintained on the outside of the oven. is not affected by the oven heat.

Experience has proven that .a light mounted in 7 the manner herein described will not be heated to a suilieient degree of temperature to be deleteri- -ously affected even under continuous operation of the oven for an interval of several days. but will be heated slightly and thereafter be maintained at a constant sale temperature.

Having thus described my invention, I claim:

1. In a domestic cooking range having an oven. an-electrlc light bulb protruding within the interior limits of the oven through a wall thereof for illuminating the interior from a point within and being directly exposed to the heat in the oven, an electric socket carried by the range for supporting said bulb and for conducting electrical power thereto. said socket while supporting the bulb in its operating position being disposed outside of the oven and directly exposed to the cooler outside atmosphere whereby the socket and parts of the bulb received thereby are undamaged by heat from the oven.

2. In a cooking range having an oven, a wall of said oven having an opening therein, a housing having a wall of heat conducting material and an opening through its said well, said housing being mounted outside of the oven with its said wall exposed tothe heat of the oven. the interior of the housing being open to the atmosphere. an electric light socket mounted in said housing in spaced relation to the side walls thereof. an electric light bulb mounted in said socket and protruding through said openings into the oven, said socket being positioned relative to said housini! so that only the glass portion of the bulb protrudes into the oven, whereby the shank of the bulb and the socket are kept at a relatively low temperature, and a shield of heat insulating material disposed between the socket and walls of the housing.

3. In a cooking stove oven having spaced inher and outer rear walls, aligned openings in said walls, a housing open at one end and snugly fitting into said outer wall opening and bridging the space between the -walls. said housing having an end wall disposed substantially in the plane of the .inner rear wall of the oven and hoving an opening aligned with the opening in the inner rear wall..the open end of the housing being open to the atmosphere. an electric light socket carried by said housing in spaced relation to the walls thereof. a light bulb mounted in said socket and protruding within said end wall opening of the housing and engaging the wall edges of the housing defining the housing opening and substantially blocking thehousing opening. whereby air trom the-outside atmosphere may pass around and into direct intimate contact with said socket and passage of heated products through mid openings to the socket is prevented.

i. -ln a cooking range having an even. a wall of said oven having an opening therein. housing means having a heat insulating end wall and an opening through its said wall. said housing being mounted outside oi the oven compartment. with its said wall exposed to the heat of the oven. the interior of the housing being open to the atmosphere. an electric light socket mounted in said housing in spaced relation to the side walls thereof. an electric light bulb mounted in said socket and protruding through said openings into the oven. said socket being positioned relative to said housing so that only the glass portion of the bulb protrudes into the oven whereby the shank of the bulb and the socket are kept at a relatively low temperature, the opening through said heat insulating end wall of the housing being such that the edges. defining the opening sub mass 3 stantiaily embrace the bulb giau adjacent-the,

shank for reducing radiation and convection 01' heat irom the oven to the said shank.

5. In a domestic cooking range oven. one wail of the oven having a portion with an openinl therethrough. an electric light bulb carried by the range and positioned to illuminate the interior oi the oven, a portion of said bulb being directly exposed in said opening to the heat in the oven, means connected to the shank portion oi the bulb tor supplying electric current to the bulb and means ior supporting the bulb in said position, said means and shank portion being disposed outside of the oven and exposed to the out- 5 side air ior cooling thereby when connected and I supporting. the bulb in said position. whereby the parts 0! the bulb and means are undamaged by heatlrom the oven.

8. In a domestic cooking range having an oven.

20 a wall oi the oven having an opening there'- through. an electric light bulb carried by the range and positioned to illuminate the interior oi the oven, said bulb engaging thewail edges defining the opening and substantially blocking the opening when the bulb is in said position for illuminating the interior of the oven, and means carried by the range exteriorly o! the oven and connectedto the shank portion 0! said bulb for supplying electric current to the bulb and for supporting the bulb in said operating position.

'7. In a domestic cooking range having an oven, one wall of the oven having an opening therein, a shield carried by the range and having an opening aligned with the oven wall opening, an electric light bulb carried by the range and posi- GEORGE HERBSTER.