US138965A - Improvement in electrical burglar-alarms - Google Patents

Description

WAL/TER.

Electrical Burglar Alarms.

Patented May 13. 1873.

AMI PHOTO UTIUEPAFH c m r. 3/555 wslq p/wrsss UNITED STATES PATENT G FFIGE;

HORACE E. WALTER, or BIOHFIELD SPRINGS, NEW YORK. 1

IMPROVEMENT lN ELECTRICAL BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 138,965, dated May 13, 1873; application filed December 10, 1872.

To all whom it may concern:

Be it known that I, HORACE E. WALTER, of Richfield Springs, in the county of Otsego and State of New York, have invented an Improvement in Burglar-Alarms, of which the following is a specification:

This invention is for giving an alarm in case of an attempt to enter a building by raising a window or opening a door, and the instrument may also be used in connection with safes, bank-vaults, 85c.

The instrument is to be located in some convenient place where it may be heard by the occupant of the premises, the watchman or police, and the connections are made by wires with the doors or windows to be guarded. At these points the electric circuit, through the wires and instrument, is to be closed, and when a burglarious effort is made and the door or window moved, the circuit is broken. These devices, being well known, do not require further description.

My improvement consists in an electromagnet and weighted armature, in combination with a latch and stop mechanism for a clockmovement, whereby the clockfmovement will be liberated to strike a bell and give an alarm when the circuit is broken, and any subsequent closing of the window or door will not stop the alarm. I combine with this mechanism a stop that can be operated by hand, and a second stop operated by a time-piece, that prevents an alarm being given after a given hour has arrived, thus preventing an alarm being given when the house or store is opened in the morning.

In the drawing, Figure 1 is an elevation of the apparatus with portions of the case removed, to show the operative parts, and Fig. 2 is a plan below the line :r 00.

The case a contains a clock-movement with the time and striking trains of any usual character, but they are disconnected so that the hours are not struck upon the bell c. The lever-stop d arrests the movement of the striking-train by coming into contact with the fly e, or one of the wheels in the train, and at the lower end of the lover (I is a sliding latch-plate e supported by the ledge or shelf f. The electromagnet g is in the circuit extending from the battery to the windows or doors to be guarded,

and the binding-screws h h receive these wires, and they pass at one side through the switch k, by which the circuit can be broken, thence they go to the electro-magnet; but for convenience of connection the springs l 1 upon the back m of the case bear upon the circuit-studs 2 2, so that the clock-movement can be taken out by removing the back, and thereby access will be given to all parts of the instrument; and when the back is replaced the electrical connections are completed by the springs I that press upon the studs 2. The armature n swings upon the axis 3, and is provided with a weight, 0, that draws the armature back when the circuit is broken through the magnet g. An arm, 1', extending up from the armature with an indicating end, 5, behind an opening in the dial, serves to show by inspection whether the circuit is open or closed. Upon the arm 1 is a hook, c, that catches into thelatch-plate c hence when the circuit is closed through g the armature is retained toward the electro-magnet, and the strikingmechdrawing upon the latch-plate and lever to liberate the clock-movement and allow it to strike the bell, and it will continue to strike until stopped by other means, or nntil'the spring runs down, because the recharging of the magnet g and the movement of the armature do not replace the stop 61, but the latch 0) slides upon the latch-plate c. When the instrument is to be disconnected to prevent the alarm operating, or to stop said alarm, the slide 6 is drawn back, its arm 7 replaces the stop d, and by the link 8 and lifter 9 the latch c is raised out of contact with the latch-plate 0. Upon the hour-hand wheel of the clock a pin, 10, is placed, and this operates-upon the sliderod 11 and lifter to raise the latch v out of the latch-plate 6; hence the latch n will be lifted every twelve hours and held up a short time, say an hour or more 5 thereby the alarm mechanism will not be operative during that time, and the apparatus can be thrown out of action by sliding the stop I) and connected parts. I

This burglar-alarm is very cheap and simple; it is not liableto get out of repair; if the battery fails or the connections are injured,

the alarm ringsfthere is but little attention.

needed; the instrument can be placed in a conspicuous place and inclosed so that it ca nnot be tampered with, and hence is very reliable, especially in country places, where police or Watchmen are not employed.

This instrument may be provided with the mechanism only between the magnet and the clock-work, thereby dispensing with the slide 6 and its parts, or the rod 11 to the clock-work, or both.

I claim as my invention- 1. The weighted armature n and electromagnet g, in combination with the hook o, latch-plate e, and stop d, to the alarm-clock movement, substantially as set forth.

2. The slide 6, arm 7, link 8, and lifter 9, in combination with the latch 11 0, stop ,d, electromagnet, and alarm-clock mechanism, substan-l HORACE E. WALTER.

Witnesses:

Gno. T. PINCKNEY, Guns. H. SMITH.

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