US1627962A - Circuit closer - Google Patents

Description

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Inventor fflflis /ier 1 Attorney 3 --L2H. .Jf%

May 10.1927.

Patented May 10, 1927.

UNETED STATES PATENT QFFEQE.

JOSEPH A. FIEBIGER, OF ST. PAUL, I/IINNLSOTA.

CIRCUIT CLOSER.

Application filed December This invention relates to alarm mechanisi s, and has more particular reference lo a means associated with the door and its iting mechanism in order that an in will be given whenever said mechais oncratcd after a manual control switch 1 the building has been moved to a closed position.

'lhe primary object of this invention is to provide a relatively simple, but etlicient alarm mechanism particularly adapted for installation in dwelli' s without requiring any great skill on the part of the party installing the alarm. The invention comprises but few parts, and being so co-related when installed as to negative the liability of iniproper operation of the signal.

With the above and other objects in View as the nature of the invention will be better understood, the same comprises the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing wherein like reference characters indicate corresponding parts throughout the several views:

liigure l is a plan view of my improved burglar alarm, installed.

Figure 2 is a side elevation of the latch operating n'iechanism control switch of the alarm, and

Figure 3 is a slightly enlarged fragmentary section of a contact member and its supporting bracket, which forms an essential part of the present invention.

Now having particular reference to the drawing, indicates the interior end of the usual knob actuated spring latch control shaft for a conventional type of latch mechanism associated with doors in dwellings, and upon which is to be disposed an essential member of the present invention.

My invention per se constitutes the provision of a cross bar-like contact arm 6 that is formed intermediate its ends with an ofl set semicircular portion 7, that is adapted to be disposed upon the top surface of the shaft 5, as clearly shown in Figures 1. and 2. For maintaining this contact arm in position upon the latch shaft 5, I provide clamp plate 8 substantially similar in shape and material to said arm, the same comprising an intermediate semi-circular portion for engagement around the lower surface of the latch shaft and. having arms 9 9 at its oppo ite ends for face to face engagement 16, 1925. Serial No. 75,736.

with the arm 6 at opposite sides of the central portion 7 in order that the same may be interconnected through the medium of bolt and nut connections 10.

invention further constitutes the pro vision of a pair of shaped brackets ll--1l that are adapted to be suitably secured to the door that carries the latch mechanism directly beneath the opposite ends of the contact arm 6 as clearly shown in Figures 1 and 2. The upper horizontal portion of each bracket is provided with a screw threaded opening 12 within which threaded from the bottom upwardly a headed metallic thimble 13 that is externally threaded at its upper ends for re ceiving closure cap 14 provided centrally with an opening l5. il ithin each thimble is a headed contact pin .16, the pin portion of which normally projects through the opening 15 through the medium of an enpansible spring 17 disposed in said thimble, Figure 3.

Each bracket ll carries an electrical binding post 17 in order that the same may be electrically connected with one pole of a stor e battery 18 through the medium of suitable wires as in Figure 1. In the line of circuit between the binding post of the brackets and said storage battery a preferred form of switch 20 is provided, in order that the binding post may be readily connected or disconnected electrically from said bat-- tcries.

The present alarm further constitutes the provision of a suitable hell or other electrical, sound producing means 21, one binding post of which is adapted to be electrically connected to the other pole of the battery 18, as shown, while the other post is adapted to be electrically connected to the contact arm 6 upon the latch shaft 5.

It will thus be seen that when the switch 20 is closed a movement of the shaft 5, through the medium of the knob in either direction will cause one of the contact arm enc s to engage first the pin 16 and then the cap let of the headed thimble 13 and con sequently complete the circuit to the bell 21. for giving the alarm that an unauthorized person is attempting to gain access to the dwelling. The provision of the spring pressed pin 16 will allow the knob to be turned a greater distance after the same has been engaged by one end of the bar 6 in order that a suiiicient alarm will be given before the end of the arm strikes a stationary member of the complementary bracket contact, even though the knob is quickly released after being brought to an unexpected sto 3.

It will thus be seen that I have provided a highly novel simple, and efficient alarm, that is Well adapted for all the purposes intended, and even though I have herein shown and described the most preferred embodiment of the invention with which I am at this time familiar, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the appended claim.

Having thus described the invention, What I claim as new and desire to secure by Letters Patent is A circuitcloser of the class described comprising a movable contact arm, an angular bracket supported Within the path of movement of said contact arm, one of the leg members 01'' said angular bracket having a threaded opening tormed therein, a thimble threadedthrough the opening, a head formed on one end of the thimble to provide a closure therefor, said head engaging the leg member of the angular bracket in which the threaded opening is formed, a cap threaded on the open end of the thimble, a headed contact pin arranged Within the thimble, the shank portion of said Contact pin extending through the cap and adapted for cooper tion with the movable contact arm, and an cxpansible coil spring arranged Within the thimble and cooperating with the head of 1? the contact pin for normally urging the same outwardly.

In testimony whereof I afiix my signature.

JOSEPH A. FIEBIGER.

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