US506040A

US506040A - Burglar-alarm

Info

Publication number: US506040A
Authority: US
Publication date: 1893-10-03
Anticipated expiration: 1910-10-03

Description

9 Model.)

A. HARTMAN.

BURGLAR ALARM. No. 506,040. Patented Oct. 3, 1 893.

UNITED STATES PATENT OFFICE.

ANDREW HART'MAN, OE HAIVTI-IORNE, NEVADA, ASSIGNOR OF ONE-HALF TO CHARLES H. REYNOLDS, OF SAN FRANCISCO, CALIFORNIA.

BU RG LAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 506,040, dated October 3, 1893.

Application filed January 28, 1893- Serial No- (NO 111011 1'0 all whom it may concerm 3e it known that I, ANDREW HARTMAN, a citizen of the United States, residing at I-lawthorne, Esmeralda county, State of Nevada, have invented an Improvement in Burglar- Alarms; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of burglar alarms in which a spring actuated gong is set in'operation by a tripping mechanism ly ng in the path of movement of a door or window, or other entrance.

It consists in the novel setting and tripplng mechanism and the sounding apparatus in connection therewith, as I shall hereinafter fully describe and specifically claim.

The object of my invention is to provide a simple and effective burglar alarm, adapted to be readily applied to doors, windows and the like entrances, and so constructed that it can be easily thrown out of but maintained ever ready for action or use, and can be set for action as often as required.

Referring to the accompanying drawings for amore complete explanation of my invent1on,Figure 1 is a perspective view showmg the application of my burglar alarm to a door. Fig. 2 is a front elevation, the gong bemg indicated by dotted lines. Fig. 3 is a top view, the gong being in section.

A is a frame.

B is a winding arbor, the outer extremity of which is adapted to receive a key.

C is a spring adapted to be wound up by and to actuate the arbor.

D is a gear on the arbor, meshing with a pinion E on a counter-shaft F, which shaft carries an escape-wheel G. WVith this wheel engages a verge H on an oscillating shaft I, which carries the striker J adapted to act upon the gong or bell K secured to the face of frame A and serving as a covering therefor, whereby, of the whole alarm device, all the parts are concealed, but the gong and the striker, and may, therefore, be made as ornamental as may be desired. Upon shaft I is a stop arm t. Pivoted at l is a catch L adapted to be thrown into and out of engagement with stop arm a. The outer end of this catch has pivoted or hinged to it at m the trip lever M,.

ver and projecting well over on to the catch.

The frame A, with its attached parts, when the alarm is to be used on a door, is secured to the door casing N in such a position that the trip lever M will, when extended, lie over and in the path of movement of the door 0. To set the alarm, the spring C is wound up, and the trip lever is extended outwardly over and flat against the door. In this position, on account of the character of the hinge connection m between said lever and the catch L, which connection will not bend backwardly, the inner end of the pivoted catch is thrown to engagement with the stop arm t' of the shaft I, whereby said shaft is held still, and its verge H, engages and 'holds' the escape wheel G, thus retaining the parts in a state of rest. Now, although the hinge connection m can bend inwardly, it is stiff enough, by reason of the strength of the spring strip 'm' and its overlap upon the catch, to cause the lever, upon being moved inwardly by the contact of the door in swinging open, to carry the outer end of the catch in with it, whereby the inner end of said catch is swung backwardly away from its engagement with the stop arm t', and thereupon, the ratchet-wheel being relieved will, under the influence of the main spring C, vibrate the verge H, and thus the shaft I will rapidly oscillate and cause a succession of blows of the striker upon the gong.

In the day-time, or Whenever it is not desirable to set the alarm, the catch is thrown to its engagement with the stop arm 1 in order to hold the shaft 1, but the trip lever is bent inwardly about hinge m, so that it will not lie in the path of movement of the door, a result which can be effected because of the position of said hinge which is beyond or within the line of the door edge. To set the device again, all that need be done is to turn the trip lever back against the door. Thus the alarm, once wound up can be thus maintained ever ready, and can be set for and thrown out of use as often as required.

It is obvious that the device can be applied to windows or other entrances having moving parts, by properly locating it, so that its trip lever will project into the path of movement of said parts.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A burglar alarm consisting of a sounding mechanism, a catch adapted to control lts operation, a trip lever adapted to be 0perated by a moving part of the entrance to which the alarm is applied, a hinge connection between said lever and catch, beyond the path of the moving part, whereby the lever can be turned out of the way of said part, without affecting the catch, and a spring controlling said connection, whereby the catch is operated when the lever is moved bysaid moving part, substantially as herein described.

2. A burglar alarm consisting of a gong or bell, a vibrating striker, an oscillating shaft carrying said striker and having a stop arm, a swinging catch adapted to engage and release said stop arm, a trip lever adapted to be extended into the path of a moving part of the entrance to which the alarm is applied, a hinge connection between said lever and catch beyond the path of the moving part, whereby the lever can be turned out of the way of said part without aifecting the catch, and a spring controlling said connection, whereby the catch is operated to release the oscillating shaft when the lever is moved by the moving'part, substantially as herein described.

3. A burglar alarm consisting of a gong or bell, a vibrating striker, an oscillating shaft carrying the striker and having a stop arm, a verge on said shaft, an escape wheel controlling and controlled by said verge, a spring and gear wheels to operate the ratchet-wheel, a swinging catch adapted to engage and release the stop arm of the oscillating shaft, a trip lever adapted to be extended into the path of a moving part of the entrance to which the alarm is applied, a hinge connection between said lever and catch beyond the path of the moving part, whereby the lever can be turned out of the way of said part without atfecting the catch, and a spring controlling said connection, whereby the catch is operated to release the oscillating shaft when the lever is moved by the moving part, substantially as herein described.

In witness whereof I have hereunto set my hand.

ARDREW HARTMAN. Witnesses:

ALVAN FLANDERS, J OHN RAFFERTY.