US320871A - Burglar-alarm - Google Patents

Description

(ModeL) W. GOLDSPOHN.

'BURGLAR ALARM.

No. 320,871. Patented June23, 1885.

WITNESSES V ATTORNEYS.

IN'VENTOR N. PETERS, Phomuche m har. Wilhillshm, D. c.

. at a distance from the door, as will be herein- 'ful Improvement in Burglar-Alarms, of which UNITED STATES- VVILLIAM GOLDSPOHN,

BURGLAR- OF LODI, \VISOONSIN.

ALARM.

SE'ECIJE'ICJA'TION forming part of Letters Patent No. 320,871, dated June 23. 1885.

Application filed October 22,1884. (Model.)

T0 aZZ whom it may concern:

Beit known that 1, WILLIAM GOLDSPOHN,

of Lodi, in the county of Columbia and State of Wisconsin, have invented a new and usethe following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional front elevation of my improvement, part being broken away and showing a knob-shank and spindle in section. Fig. 2 is a side elevation of the same, partly in section. Fig. 3 is a side elevation ofthebow, yoke, and screw for securing the alarm to the shank of the door-knob. Fig. 4is a front elevation of the upper part of the back plate of the casing. Fig. 5 represents a lever and cord for connecting the alarm with a door-knob shank.

The object of this invention is to provide a simple and reliable burglar-alarm constructed in such a manner that it can be readily connected with a door knob and disconnected therefrom.

The invention relates to a burglar-alarm for doors, constructed with a sliding block having an arm to engage with a pin upon an escapement-wheel, the escapement of which carries a bell-hammer, and which is driven by a spring connected with the casing. The sliding block is provided with interior shoulders to engage with exterior shoulders upon a bow having circular grooves working on guides attached to the casing. The bow is also provided with undercut shoulders to receive a yoke provided with a hand-screw for securing the bow to the shank of a door-knob. \Vith the sliding block is connected a spring attached to the casing, to cause the said block to make a prompt descent when the bow is released. The bow is connected by a string with a lever adapted to be secured to the shank of a door-knob, so that the alarm can be placed after fully described and claimed.

A represents two plates that form the casing of the alarm, and which are connected with each other by posts B. The front plate, A, is made with an offset to bring its upper part near and parallel with the upper part of the rear plate, as shown in Fig. 2.

Oisa coiled spring, which is placed between the front plate, A, just below its offset, and a guard-plate, D, secured to the said plate A.

The outer end of the spring 0 is attached to one of the posts B, and its inner end is attached to the shaft E, around which the said spring is coiled. The shaft E is journaled to the plates A, and with it isconnected, bya spring pawl, F, and a ratchet -wheel, G, the large escapement-wheel H. With the teeth of the wheel H engages the escapement l, the shaft J of which rocks in bearings in the plates A.

To the escapement-shaft J is attached the shank of the bell-hammer K, so that the said hammer will be operated by the movement of the said escapement. L is the bell, which is attached to one of the plates A in such a position as to be struck by the hammer K as it is vibrated.

To the escapementwheel H is attached apin. M, with which engages an arm, N, attached to a shoulder formed upon the lower edge of the block 0, which slides up and down between guide-pins P, attached to the plates A, and is drawn down by its own weight and by the elasticity of the spring Q, attached to the offset of the front plate, A, and the free end of which rests upon the upper end of the arm N. The upper end of the block 0 is recessed to receive the lower end of the bow 'R, and is provided with interior shoulders, S, which engage with the exterior shoulders, T, of the said bow B, so that the block 0 will be raised by the rocking of the said bow. In the opposite sides of the lower part of the bow R are formed grooves U, which are curved in the arcs of circles, and into which fit curved ribs V, or other suitable guides formed upon or attached to the inner sides of the plates A, to

bow R are formed points or teeth Z,to engage with the shank of the door-knob and prevent the said bow from slipping upon the said shank.

In using the alarm the bow R is passed up ward around the shank of the door-knob, the yoke X is inserted below the shoulders \V and above the said shank, and the handscrew Y is turned down until the bow R is firmly clamped to the said shank. When thus attached any movement of the door-knob will turn the bow R, raise the plate 0, and withdraw the arm N from the pin M, allowing the alarm to be sounded. \Vhen the knob is released, the weight of the case A and its attached mechanism will turn the bow R back into a vertical position, and allow the block 0 to descend and lower the arm N into such a position that the pin M, when the wheel H has completed a revolution, willstrike against the said arm and stop the vibration of the bellhammer, leaving the alarm set ready to sound another alarm should the door-knob be again turned, and so on until the spring C has run down.

In case it is desired-to place the alarm near the bed or in some other position away from the door, the forked end of the lever a is secured to the shank of the doorknob by the hand-screw b, which passes through a screwhole in one arm of the said forked end, so as to rest against the said shank. Upon the inner surface of the other arm of the forked end of the lever a are formed points or teeth 0, to engage with the shank of the door-knob, and prevent the said lever from slipping upon the said shank. The other end of the lever a is perforated for the convenient attachment of the end of a string, d, the other end of which is designed to be attached to the screw Y or bow B, so that the turning of the door-knob and the consequent movement of the lever a will move the bow R and cause the alarm to sound. The string at can be passed around the round of a chair, the leg of a table, or other convenient guide, to give it the proper direction with respect to the lever to and bow R to cause a movement of the door-knob to move the said how.

If desired, a string or strings from a window or other object can be connected with the screw Y or how R to trip the alarm in case the said window or object be moved.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a burglar-alarm for doors, the combination, with the case A, the spring 0, the escapenient I, the shaft of which carries the bellhammer, and the escapement-wheel H, having pin M, of the sliding block 0, having arm N and interior shoulders, S, the bow It, having exterior shoulders, T, undercut shoulders W, and curved grooves U, the yoke and screw X Y, and the guides V, substantially as herein shown and described,whereby a movement of the said bow will release the alarm, as set forth.

2. In a burglar-alarm for doors, the combination,with the rocking bow R, having shoulders WV, of the yoke X and hand-screw Y, sub stantially as herein shown and described, whereby the said how can be readily secured to the shank of a door-knob, as set forth.

3. In a burglar-alarm for doors, the combination, with the casing A and the ratchetwhcel H, provided with pin M, of the sliding block 0, having arm N, the bow R, and the spring Q, substantially as herein shown and described, whereby the prompt descent of the said block when released will be secured, as set forth.

. 4. In a burglar-alarm for doors, the combination, with the sliding block 0, having interior shoulders, S, of the bow R, having exterior shoulders,T, substantially as herein shown and described, whereby a movement of the said how will raise the said block, as set forth.

5. In a burglar-alarm for doors, the combination, with the bow R, having circular grooves U and the casing A, of the curved guides V, substantially as herein shown and described, whereby the said how will be pivoted to the said casing, as set forth.

\VILLIAM GOLDSPOHN.

W'i tn'esses:

S. H. WATsoN, ORRIN RICE.

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