US1560883A - Electric switch - Google Patents

Description

Nov. 10, 1925 A. VOLLAND ELECTRIC SWITCH Filed Jan. 26, 1925 I'I I I F Patented Nov. 10, 1925.

UNITED STATES ALBERT. venue or rummeeqr, ess cmn. QF' ZONE-HALE T WILL M 9 mesa-e P PWQTPN LEQ P 3 1.13.3

Application fi'l ed January 26;, 1923. Serial No. 6151163.

To all whom it may concern Be it known that I, ALBERT V LLAn D, a citizen of the United States, residing at Burlington, in the county of Cofiey and State of Kansas, have invented a new and useful Electric Switch, of which the followin is a specification.

his invention relates to electric switches and more particularly to automatic alarm switches.

The object of the invention is to so construct a switch of this-character that it may be used in connection with a closure where a sliding or jam contact is available to normally hold the switch in open position, the

switch automatically closing on the opening of the closure and connected to' operate a signal when so closed.

Another object is to provide a simple and efiicient switch of this character which may be installed so as to be practically concealed to adapt an alarm to be sounded without giving notice to the person sounding it.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings Figure 1 represents a vertical section through a window frame with this improved switch shown applied and in side elevation.

Fig. 2 is a longitudinal section through the switch. I

Fig. 3 is a front elevation thereof.

Fig. 4 is a transverse section taken on the line 44 of Fig. 2, and

Fig. 5 is a diagrammatic view showing the wiring for the switch.

In the embodiment illustrated, the switch 1 constituting this invention is shown mounted in a window frame F and is operable by the sliding movement of the sash S, the switch being held in open position when the sash is lowered as shown in Fig. 1, and which will automatically close on the opening of the sash as shown in Fig. 2.

The switch 1 includes a hollow casing 2 which may be of any desired cross sectional configuration, being here shown in the form of a cylinder open at both ends. This cylinder is provided at one. end with a laterally extend-iing apertured attaching flange 3 for connection with a face. plate 10, said plate being equipped with apertures to. re-

ceive fasteningibolts 12 and shown provided designed to .be connected, a current conducting wire \V.

The plunger head 15 is carried by a rod 16. mounted to reciprocate in the casing, 2, said rod extendingtlu'ough a guide disk or washer 22 fixedlymounted in the inner end of the casing- 2. This rod extends thr ug said disk andicarriesat its outer end an insulating disk 17 which is encased within a metal shell 18 having a wire attaching lug or car 19 at its outer end and an inturned flange 20 at its inner end. WVhen the flange 20 abuts the outer end of the casing 2, the circuit is closed and the current flows through the switch from the source B and sounds the alarm A, which is preferably in the form of a bell.

The insulating disk 17 is shown connected with the end of rod 16 by a pin 21 which extends transversely of the disk and is embedded therein and through the rod 16, as is shown clearly in Figs. 2 and 4.

A coiled spring is mounted on the rod 16 within the casing 2 and bears at one end against the disk 22 and at its other end against a stop 24 which is here shown in the form of a pin extending transversely through the rod. This spring 23 exerts its tension to normally project the plunger head 15 and to move the rod 16 outwardly into position to bring the shell 18 into engagement with the casing 2 and thereby close the switch.

The plunger head 15 which extends through a slot 25 in the face plate 10 is rounded or curved on its outer face as shown clearly in Figs. 1 and 2 to adapt the plunger to be moved inwardly by a sliding closure or by a push exerted thereon so that it may be used either in connection with lunged doors or sliding windows or the like. This switch s located 1n a c1rcu1t having a knife switch 26 so that when not desired for use, the switch 1 may be thrown out of operation. 7 V

In the use of this invention, the switch 1 having been mounted in an opening in a window frame F with the face plate 10 arranged fiush with the outer face of said frame, the plunger head 15 will project into the pathof the sash S so that when said sash is lowered into closed position, the plunger will be forced inwardly, thereby moving the shell. 18 away from the casing 52 and breaking the contact. This is the normal position of the parts when the window is closed. When the window is opened suliiciently to move the sash S out of engagement with the plunger head 15, the

spring23 will project said head and move the shell 18 into contact with the casing 2 and thereby close the switch and sound the alarm; I

lVhile this device is shown in connection with a window, obviously it may be used in many other places, being applicable to cash boxes, vaults, counterdrawers, doors or any form of window where a sliding or jam contact is available,

Various changes in the form, shape, proportion and other minor details of construction may be made without departing from the principle or sacrificing any of the advantages of the claimed invention.

ends with an instruck annular rib near one I end on its inner face and at its other end with a-laterally extending apertured attaching flange for connection witha support, said casing having an apertured tongue struck out of one side wall thereof designed to receive a current conducting wire, an insulating disk mounted in said casing and held engaged therein by said rib, a rod mounted to reciprocate in the insulating disk of said casing, and having a headat one end projecting beyond one end of the casing, an insulating disk carried by the other end of said rod, a metal shell encasing said disk and having a wire attaching lug and an inturned flange at its inner end adapted to abut the outer end of the casing to close the circuit, a coiled spring mounted on the rod within the casing and adapted to normally project the head carried by the rod and to close the circuit, said head being designed to engage a cooperating, member for holding the circuit open.

In testimony that I claim the foregoing as my own, I have hereto affixed my sig-' nature.

Images