US2224551A - Tamper switch - Google Patents

Description

P. ROEDER TAMPER SWITCH Dec. 10, 1940.

Filed May 18, 1957 INVENTO 7 RQE D a PAUL A.TAL@0T. ATTORNEYS.

BY wmiz Patented Dec. 10, 1940 UNITED srnrss TAMPER SWITCH Paul Roeder, Brooklyn, N. Y., assignor to National Wiring & Protective 00., Inc., a corporation of New York Application May 18, 1937, Serial No. 143,281

2 Claims.

My invention relates to an electrical switch in which the tamper or operator is operated by the movement of a door or other closure and for the purpose of giving an alarm or signal, and has among its objects to provide:

A switch having a minimum of exposed electric conductors.

A damp proof switch.

A switch with a variable travel of the operator.

A switch having a large by travel after contacting.

A tamper proof switch.

I accomplish these and other objects by the construction herein described and shown in the accompanying drawing forming a part hereof in which:

Fig. l is an elevation of my switch broken away to show the working and interior parts.

Fig. 2 is a side elevation of my device.

Fig. 3 is a bottom view of my device.

Fig. 4 is a fragmentary view showing one of the applications of my device.

Similar reference characters refer to similar parts throughout the several views of the accompanying drawing and in the specifications to follow.

Spring switches for alarms have been used in various ways and for signaling the moment a door, window or the cover to a box or chest is opened.

When one object is moved from its normal place some of these devices cause the alarm by making the contact to complete an electric circuit and others by breaking the contact and disconnecting the electric circuit to the source of current cause the alarm or signal such as a bell, light, siren, etc. Solenoids, springs, weights, etc. are combined to operate these devices and need not be described as they have been widely used daily and form no part of this invention which is limited to the switch at the immediate point where it is desired to indicate the movement of the part from its normal position.

My device comprises thetamper l which contacts the object which, when moved, may break pression said contactor, the plunger spindle I,

and the tamper secured to it outwardly. The spindle 1 is slidable and substantially water tight in the aperture 8 in said housing 4 which protects the contactor 6, spring 2 and the yielding terminals 9 and Hi from the elements and dirt when my device is installed out of doors.

The terminals are of sufiicient length to permit considerable travel of the contactor which passes between them before being out of contact 5 as it is when the circuit is broken to cause the signal.

The extreme travel of the moving parts of my device maybe seen in broken lines by referring to Figures 1, 2 and 4 of the drawing. p w

Under some conditions of installation the terminal screws H and I2 may be reversed as shown in broken lines and the wires may thus be connected on the underside of the base 3.

The heads l3 and It of said screws may be 15 insulated thus all electric conductors may be covered.

Between the base 3 and the cover l5 are positioned the fiat connectors It and I1, between said screws II and i2 and the terminals 9 and I0. An insulated sleeve '8 guides the end of said spindle i and holds said spring.

The connectors i6. and I7 preferably lie in the groove it which is sealed water tight at the ends I9 and 2B and the threaded terminal bosses 2| and 22 secured to said connectors and the spring terminals are provided with the shoulders or flanges 23 and 2 holding said bosses firmly in place in said cover l5.

The housing 4 resting on said cover I5 is secured to the base 3 and cover l5 by the screws 25 and 28 which are concealed and insulated by the housing 4, base 3 and cover I5 all of which are of insulating material.

Positioned on identical centers and thus interchangeable with said housing I have provided the bracket 21, the apertures 28 and 29 of which are positioned to receive said screws 25 and 26. The apertures 3% and 3! are likewise positioned and centered to receive the screws 25 and 26 so that the bracket 2i may be secured to either face 32 or 33 of said bracket.

My device may also be secured to some objects by means of the apertures 3 of the base 3 and cover 35.

In Figure 4 I have shown one of the numerous applications of my device in which the bracket 2"! is'secured to the door jamb- 35 so that the tamper l rests against the door 36 normally and as the door is opened as shown by'the broken lines the tamper l is permitted to move out of its housing breaking the contact and causing an alarm; a wiring diagram such as shown in Figure 6 illustrates such a circuit. The weight of the core 3i of the solenoid 38 operates the switch 39 making a separate circuit sound alarm 40.

Figure 5 shows the alarm 40 operated by a single circuit and by the contactor 6 making the completion of the circuit.

For the purpose of clarity, I have herein shown and described my device in its simplified form in detail. Obvious modifications may occur to any one skilled in the art of electric circuits and switches. I therefore do not wish to be limited to the details herein described as I may wish to depart therefrom within the scope of the appended claims which set forth my invention.

I claim:

1. In a switch having a spring actuated tamper, a spindle and contactor thereon, a housing apertured to receive and guide one end of said spindle, the opposite end of said spindle extending beyond said contactor and a spring around said extended end guiding the movement of said tamper and retracting said contactor and tamper, a guide sleeve of insulated material around said spring and extended end of said spindle cooperating with said apertured housing in guiding said spindle and said spring, and terminals of springy electrical conducting material having upturned ends receiving said contactor when depressed by said tamper between said upturned ends said terminals extending out of said housing and having means at the outer ends thereof for conthe necting electricwires, a base and cover detachably secured to said housing permitting the removal of said housing independent of the removal of said electric wires whereby access to said contactor and spring may be had for inspection.

2. In a switch having a spring actuated tamper, a spindle and contactor thereon, a housing apertured to receive and guide one end of said spindle, the opposite end of said spindle extending beyond said contactor and a spring around said extended end guiding and retracting said contactor and tamper, a guide sleeve of insulated material around said spring and extended end of said spindle cooperating with said apertured housing and said spring in guiding said spindle, and conductors of springy electrical conducting material having upturned ends receiving said contactor when depressed by said tamper between said upturned end, terminals secured to said conductors said terminals extending out of said housing and having means at the outer ends thereof for connecting electric wires, a base and cover detachably secured to said housing permitting the removal of said housing independent of the removal of said electric wires whereby access to said contactor and spring may be had for inspection and a bracket detachably secured to said base having means on the exterior thereof for removingsaid housing.

PAUL ROEDER.

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