US1919210A

US1919210A - Door switch or the like

Info

Publication number: US1919210A
Application number: US630883A
Authority: US
Inventors: Harry A Douglas
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-08-29
Filing date: 1932-08-29
Publication date: 1933-07-25
Anticipated expiration: 1950-07-25

Description

July 25, 1933. H DOUGLAS 1,919,210

DOOR SWITCH OR THE LIKE Filed Aug. 29, 1932 f 710677.147?" D0 c yZag Patented July 25, 1933 PATENT OFFICE HARRY A. DOUGLAS, OF BRONSON, MICHIGAN DOOR SWITCH OR THE LIKE Application. filed August 29, 1932. Serial No. 630,883,,

This invention relates to door switches or the like in which a circuit is discontinued When the door is closed and is automatically continued when the door is opened.

The invention aims to provide an improved switch which is simple in construction and in which the moving parts are so guided that positive operation is secured.

The invention will be more fully explained by reference to the embodiment shown in the accompanying drawing, in which- Figure 1 is an axial section taken on the line 1 -1 of Figure 3, the attaching plate being broken away;

Figure 2 is a cross section taken on the line 22 of Figure 1;

Figure 3 is an end elevation taken on the line 33 of Figure 1; and a Figure 1 is an assembled view showing diagrammatically an illustrative circuit,

Referring to the figures of the drawing, the illustrative switch includes a metallic casing 1, which is preferably cylindrical and has a double flange as at 2 at one end by which the casing issecured to a suitable attaching plate 3, the double flange being crimped about a central aperture in the plate.

One end of the casing 1 is closed by an insulating mounting 4, which is secured in place as by having fingers 5 integral with the casing bent over the periphery of the mounting.

The insulating mounting 4 carries two current conducting terminals 6 which are rigidly secured to the mounting 4 as being passed through suitable apertures 4a in the mounting and having the margins of these apertures clamped between the spaced apart shoulders 7 8 formed on the terminals 6. The terminals 6 thus extend in parallel direction upon the exterior of the casing 1.

Rigidly secured to each of the terminals 6 is a metallic contact member 9 which in this instance is cylindrical and is formed inare passed slidably through circular holes 11 in an insulating disc 12 which is thus movable axially of the casing 1 guided by the contact members 9.

The free ends 10 of the contact members 9 are enlarged transversely, as here shown by having the annular flanges 13 formed thereon. To provide a current conducting bridge between the contact members 9, the face of the disc 12 carries centrally thereof a metallic bridge member 14 which desirably has cut out portions through which the contact members pass, the arcuate margins 15 of the cut out portions of the member 14 margining the margins of the holes 11 and, in one position of the disc 12, engaging the flanges 13 of the members 9, as shown in Figure 1. The member 14 may be fixedly secured to the disc 12 as by having ears 16 formed integrally with the member let and i passed through the slots 17 in the face of the disc to be bent upon the other side thereof.

To urge the disc 12 to the position shown in Figure 1 in which the switch is closed and a circuit continued therethrough, I desirably provide a compression coil spring 18 surrounding each of the members 9 between the disc 12 and the insulating mounting a into engagement with the flanges 13 of both the members 9. Thus the springs 18 func tion independently but with substantially equal pressure pressing the disc 12 substantially equally in the vicinity of the members 9.

To retract the disc 12 against the force of the springs 18, I provide an actuator in the form of a cup 19 slidably carried by the end of the casing opposite the insulating mounting 4t and having an elongated cylindrical skirt portion 20 which snugly telescopes within the casing to be guided by the inner surface thereof. The skirt portion 20 of the actuator receives therein the disc 12 and the free ends 10 of the members 9. To cause movement axially of the actuator to effect movement of the disc 12 on the mem her 9 I provide an abutment such as the internal annular head 21 in the skirt portion and thus pressing the bridging member 1i 20 which axially abuts the periphery of the disc 12. Movement of the actuator 19 inwardly of the casing 1 thus causes the bridge member 14 to be disengaged from the flange 13 and discontinues the circuit through the members 9. To facilitate retraction of the actuator 19 I may form it with an integral reduced button portion 22 which projects through the end of the casing. A shoulder 23 between the portion 22 and portion 20 of the actuator limits movement thereof out- Wardly of the casing.

When used as a door switch, the attaching plate 3 may be conveniently mounted substantially flush with the surface of a door jamb 2 1 by means of the attaching screws 25, the casing 1 being disposed in a cut-out 26 in the jamb and the button 22 being disposed so as to be abutted of the edge of the door 27, thus placing the switch. in off position. N hen the door is opened the springs 18 cause the switch to move to on position as described and a circuit is continued, for example, through the grounded battery 28, conductor 29, terminals 6, corn ductor 30 and grounded filament 31 of a lam 32.

T e conductors

29 and 30 are here shown. as Wires which may be each connected to one of the terminals (3 as by being provided with a plug termination 33 which is received in the socket 3d of the terminal (5 and yieldingly retained therein by friction with the detent 85 pressed thereagainst by the spring 36 carried in the spring barrel 37 formed integrally with the terminal 6.

Having described my invention, I claim:

1. As an article of. manufacture, a door switch or the like, comprising in combinat-ion, a metallic easing; an insulating mounting forming a closure for one end of the easing; two current conducting terminals carried by the mounting and extending in parallel relationship upon the exterior of the casing; a contact member attached to each of the terminals and extending in parallel relationship rigidly within the interior of the casing; an insulating disc in the casing, said contact members having their free ends passing slidably through the insulating disc; a transverse enlargement at the termination of each of the free ends of the contact members; a metallic bridging member carried by the face of said disc and engageable with the transverse enlargements of the contact members to provide a current conducting bridge therebetween a coil spring surrounding each of the contact members between the disc and the insulating mounting and pressing the bridging member against the trans verse enlargements; and a cup-like actuator slidably carried by the end of the casing opposite the insulating mounting and having a skirt portion telescoped within the casing, said skirt portion receiving therein the disc and the free ends of the contact members and. having an internal abutment engaging the disc axially of the casing, said cup-like actuator having a button portion projecting through an aperture in the end of the casing opposite the insulating mounting.

2. The structure of claim 1 wherein the contact members are cylimlrical. and pass snugly through circular apertures in the insulating disc which is guided thereby, and wherein the bridging member is cut out arcuately to receive the contact members therethrough and to margin the holes in the disc.

HARRY DOUGLAS.