US577154A

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US577154A, drawing sheet 1 — Sheet 1 of 1

2 claims: 2 independent, 0 dependent

1
Having now described my invention, what 95 I claim as new, and desire to secure by Letters Patent, is— 1. The combination with a door, of alarm mechanism made up of a casing, consisting of two plates secured by uprights, a gong, a 100 hammer for said gong, a shaft upon which said hammer is mounted, a lateral arm on 577,154 said shaft, a spring engaging said arm, a rod moving in suitable ways in two of said uprights, having a score at one point therein whose curved sides are adapted to engage 5 said spring, and connections between said rod and the handle of the door, substantially as and for the purpose described.
2
The combination with a door, of alarm mechanism therefor, the same consisting of to a casing having two side plates secured by suitable uprights or bolts, a strip of metal extending outwardly from one of said plates, a bolt passing through the outer encl of said strip, having arms on its inner encl which 15 are adapted to fit in the keyhole of said door, and a thumb-screw for tightening said bolt, a gong, a hammer therefor, a shaft upon which said hammer is mounted, a lateral arm on said shaft, and a spring for engaging said lateral arm, a release-bar moving in suitable 20 ways in two of said uprights, having a score at one point therein whose curved edges are adapted to engage said spring, an adjustable rod upon the outer encl of said release-bar, and a spring-clip upon the outer end of said 25 rod whereby connection is made with the door-knob of said door, substantially as and for the purpose described. In testimony whereof I have signed this specification in the presence of two subscrib- 30 ing witnesses. JAMES II. WALTERS. Witnesses:T. P. Brown, D. N. Keast.

Independent claims2

12 paragraphs, as filed

Application filed May 15,1896. Serial ®o. 591,695. (Bo model.)

To all whom it may concern:

Be it known that I, James H. Walters, a citizen of the United States, residing at Harlansburg, in the county of Lawrence and State 5 of Pennsylvania, have invented certain new and useful Improvements in Burglar-Alarms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the io art to which it appertains to make and use the same.

My invention relates to improvements in burglar-alarms, the object of the same being to provide a simple and convenient alarm 15 which maybe carried in the coat-pocket and be readily and quickly attached to and detached from any door or window.

The invention consists of an alarm of ordinary construction mounted in a suitable cas20 ing, means for attaching said casing to any door, a release-bar for the gong, ancl means connected with the door-knob whereby the alarm is released and the gong is sounded.

It also consists in other details of construc25 tion and combinations of parts,which will be hereinafter more fully described and claimed.

In the drawings, Figure 1 represents a side elevation of my improved alarm, shown attached to a door. Fig. 2 is an end elevation 30 of the same detached from the door. Fig. 3 is a detail perspective view of the releasingmechanism and the means for attaching the same to the door-knob.

Like reference-numerals indicate like parts 35 in the different views.

My alarm device is made up of a casing having side plates 1 and 2, which are con• nected by upright bars or bolts 3 4 5. Between these plates the operative parts of my 4° device are situated. These parts consist of the main shaft 6, having a turn-handle 7 upon its upper end and a cog-wheel 8 at a point intermediate between its ends. The said shaft also has connected to it the coil-spring 9, the 45 outer end of which is attached to one of the uprights 5. The cog-wheel 8 on the main shaft 6 meshes with a pinion 10 on a shaft 11, having a ratchet-wheel 12 thereon which engages the escapement 13 on the shaft 14, jo which latter shaft carries a hammer 15 for striking the gong 16. The mechanism just described forms no part of my in vention, the same being old and well known. Adjustably secured to the under side of the plate 1 is a strip 17, extending outwardly therefrom and 55 formed with an opening 18 in its outer end. Through this opening 18 passes a screw-bolt 19, having laterally-extending arms 20 20 on its inner end and provided with a thumbscrew 21 at its upper end. This is provided 60 for the purpose of securing the alarm mechanism to the door, to which it is applied by inserting the arms 20 into the keyhole-slot in said door and tightening the screw 21.

The shaft 14 is provided with a laterally-ex- 65 tending arm 22, which is normally held upward by the engagement of a flat spring 23, secured to the under side of the plate 1 of the casing. When the said arm is so engaged, the hammer 15 is held stationary and pre- 70 vented from ringing the gong 16. The flange or upturned end of the spring 23 is adapted to be engaged by the sides of a score 24 in a reciprocating bar 25, moving in ways in the uprights 3 5 and connected at its outer end 75 to a rod 26, having a spring-loop 27 upon its outer end which is adapted to fit over and closely engage the shank of the door-knob.

The rod 26 is adapted to be lengthened or shortened in any suitable way. 80

In applying my alarm to any door it is merely necessary to insert the arms 20 into the keyhole-slot of the door and tighten the same by turning the screw 21. The rod 26 is then so adjusted that the spring-loop 27 85 upon its outer end will just fit over the shank of the door-knob, and when so adjusted the slightest movement of the door-knob will cause the rod 25 to be thrown in or drawn out, and throw the sides of the score 24 therein 90 into engagement with the lower end of the spring 23, throwing the same out of engagement with the arm 22 on the shaft 14 and permitting the gong 16 to be sounded.

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