US893898A - Illuminating device for bake-ovens. - Google Patents

Description

PATENTED JULY21, 1908.

G. N. BERGMANN. ILLUMINATING DEVICE FOR BAKE OVENS.

APPLICATION FILED DEG.14,1907.

III-

UNITED STATES PATENT OFFICE.

CHRISTIAN N. BERGMANN, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO WARD-MAOKEY COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ILLUMINA'IING DEVICE FOR BAKE-OVENS.

Specification of Letters Patent.

Patented July 21, 1908.

Application filed December 14, 1907. Serial No. 406,511.

To all whom it may concern:

Be it known that I, CHRISTIAN N. BERG- MANN, acitizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Illuminating Devices for Bake-Ovens, of which the following is a specification, reference .being had therein to the accompanying drawing.

My invention refers to improvements in bake-ovens or similar apparatus and is designed for the purpose of roviding automatically operative means for lighting the interior of the oven actuated by the opening of the door to close the circuit to a lamp so located as to illuminate the interior of the oven and to break the circuit automatically upon closing of the door as shall be more fully hereinafter described.

Referring to the drawingsFigure 1 is a view in front elevation of an oven provided with my improvement. Fig. 2 is a horizontal sectional view indicated by the line II, II of Fig. 1. Fig. 3 is a vertical sectional View on an enlarged scale indicated by the line III, III of Fig. 1. Fig. 4 is a face view in elevation of the current making and breaking switch.

2 represents the front wall of the oven, or of any chamber the interior of which it is de sired to illuminate, preferably provided with a door frame 3 of any suitable construction in which is hung by any suitable hinge oints 4, the swinging door 5.

6 represents the hinge rod or shaft of the door mounted in suitable hinge bearings within the frame 3 and so connected with the door that the shaft and door will necessarily move together. In the construction shown, the door normally occupies the position shown in Fig. 3 when closed, resting downwardly upon the floor plate of the oven or frame, opening inwardly in the direction of the arrow to a raised position, indicated in dotted lines, for insertion or removal of the contents. The hinge shaft 6 is preferably provided at one end with an operating lever 7 having a balancing counterweight 8 for facilitating the manipulation of the door, the front wall or frame 3-being provided if desired with a suitable cavity 9 as shown for containing such parts. At the other side of the door, (or at the same side of the door as is provided with the operating lever, if preferred,) preferably within a similar receiving cavity 10, is located the automatically-operative circuit making and breaking mechanism, which is constructed as follows: One or more lamps 11 are located in the interior of the oven at any suitable point for good illumination and are connected by circuit wires with attaching binding post terminals 12 and 13 mounted on an insulating base 14.

15 is a lever pivoted at 16 and in electrical communication with binding post terminal '13, provided at one end with a contacting make-and-break terminal 17 and at the other end with an overbalancing counterweight 18, adapted to normally hold terminal 17 in electrical contact with a bearing abutment or flange 19 of binding post terminal 12.

The end of the hinge shaft 6 projects into proximity with the counterweighted end of lever 15 and is provided with a projecting arm or lug 20, integral with or secured to the shaft, adapted to swing up underneath the counterweighted end of frame 15, when the oven door is lowered as in Fig. 3, thereby lowering terminal 17 away from contact with bearing 19, and to be depressed below said arm '15 when the door is open as indicated in dotted lines in Fig. 3 (when illumination is desired) permitting the counterweighted end of lever 15 to fall and terminal 17 to make circuit-closing contact with bearing 1.9 to establish a current through the lamp.

At the point on lever 15 where arm 20 engages underneath it, it is provided with an insulated contact bearing 21 and intervenmg insulation 22, thereby preventing short circuit through the lever, as Will be readily understood.

It will be obvious that the contacting if mechanism may be changed or varied by the skilled mechanic over the construction shown and described, the form utilized in the present application being one which I have used successfully in practice, but all such changesor variations in its detailed construction are to be considered as within the scope of the following claims.

Having described my invention, what I claim and desire to secure by Letters Patent, 1s

1. The combination with a bake oven pro vided with an electric lamp arranged to illuminate its interior, of two attaching elements adapted to be connected to close the circuit through the lamp, a lever pivotally mounted on one of said elements having a counterweight at one end and an abutting makeand-break terminal at the other end adapted to bear against a portion of the other element by the gravity of said counter-weight, and an opening and closing door provided with a hinge rod having an arm arranged to engage underneath the counter-weighted end of said lever to lower its make-and-break terminal from contact with said element when the oven door is closed, to break the circuit, substantially as set forth.

2. The combination with a bake oven provided with an electric lamp arranged to illuminate its interior, of two attaching elements adapted to be connected to close the circuit through the lamp, a lever pivotally mounted on one of said elements having a counterweight at one end and an abutting make-andbreak terminal at the other end adapted to bear against a portion of the other element by the gravity of said counter-weight,a11d an opening and closing door provided with a hinge rod having an arm arranged to engage underneath the counter-weighted end of said lever to lower its make-and-break terminal from contact with said element when the oven door is closed, to break the circuit, said counter-weighted lever having an insulating cover at its point of contact with the hinge rod arm, substantially as set forth.

In testimony whereof I afhx my signature in presence of two witnesses.

CHRISTIAN N. BERGMANN.

Vitnesses:

C. M. CLARKE, CHAS. S. LEPLEY.

Images