US237076A - Chaeles f - Google Patents

Description

PATENT OFFICE'.

CHARLES E. GEAEY, E NEW YORK, N. Y.

BURG LAR-ALARM AND DO'O R` FASTENING.

SPECIFICATION"` forming part of Letters Patent No. 237,076, dated January 25, 1881-. Application filed November l1, 1880. (No model.)

To all whom it may concern Be it known that I, CHAELEs F. OEAEY, of the city, county, and `State of New York, have invented a new and useful Improvement in Door Fasteners and Alarms, oi' which the following is a ful1-,`clear and exact description. Y

The object of my invention is to furnish de- 4vices by which doors can be readily and securely fastened when shut, and by which an alarm shall be given in case the fastenings are tamperedwith. I provide fastenings that are fitted for connection with the knob-spindle, so as to prevent its being turned v suliiciently to release the latch, and the fastenings are connected with an alarm-bell which is brought into operation by a slight movement of the knob.

In the accompanying drawings, Figure 1 is an elevation, showing my fastener and alarm as applied to a door. Fig. 2 is a vertical section through the bell, showing also its connection to the fastenings. Fig. 3 is a section of the bell on line'w w of Fig. 1. Fig. 4 represents the bracket'for receiving the hook ofthe fastening. Fig. 5 is a face view of the bell.

Similar letters 'of reference indicate correj sponding parts.

`A represents a door, of which a is the knob, andB represents the doorjamb.

C is a lever secured to the spindle of knob a, and having a chain, b, passing from each end to a hook, c, that is connected to a bracket, d, secured at a suitable place on the jamb B. The lever G may be secured to the knob-spindle in any suitable manner. A strap from the lever may be placedaround thespindle and secured by a screw, or the spindle be iitted with an aperture-block to receive the lever; but I prefer the construction shown. To the spindlela block, e, is secured by the screw which holds the knob. The lever C is provided at its mid-length with a,1ug,j, having a pin, f', that enters an aperture of block e. This construction is simple and permits the ready connection and disconnection of the lever, and as the lever has simply to be raised for its disconnection there will be no risk of mistake by confusion. The pin f is curved, so that in releasing it from the block the chain at the llower end will be drawn upon suficiently to operate the alarm, this being for giving an alarm in case an attempt is made to remove the lever by an intruder. Theupper end of the lever is formed with a hook, as shown, by which it can be suspended when not in use.

D is the alarm, consisting of clockwork provided with a spring, the Winding-arbor g of which passes through a stud, h, formed on the iront plate of the works, to which stud the bell is secured, so that the'works are covered by the bell. The hammer k is fitted to vibrate in an arc at the edge of the bell, the bell being either cut out to receive the hammer, as shown,

or formed at its inner side with a lug, against Which the hammer will strike.

l is the trigger, provided with a spiral spring acting to force the trigger end against the hammer-arm to prevent its vibration.

m is a lever pivoted to a stud of the works, so that its longer arm will engage with a notch in trigger when the latter is fully drawn out, thereby holding the trigger and allowing the bell to ring until the lever is disconnected by hand. By this construction a slight movement of the trigger l will cause a tap or two of the bell, and a longer pull will cause continuous ringing.

From the outer end of trigger l a wire, fn, passes to the hook c of the knob-fastenings, and an elbow-lever is used if required by the position of the bell.

The bracket d is of peculiar construction, whereby it will retain the hook and allow sut'- icient movement of the hook to operate the bell. As shown in Fig. 4, the bracket is formed with two lugs, d', in which are long slots for the hook to pass through, and the wire nfrom the alarm is connected tothe hook between the lugs d. The wire and chains being drawn taut, the hook can move in the slots of the lugs sufficiently to operate the alarm, and is then held fast by the lugs to prevent the knob from turning farther.

From the above description it will be seen that the knob of the door is fastened so that it cannot be turned sufficiently to release the latch; also, that in case the knob is turned slightly in either direction the alarm will be sprung.

These devices are simple and inexpensive and may be applied to any door-knob.

ICO

2. In a burglar-alarm connecting with a door-knob, the lever C, provided with a median r 5 lug, f, having a curved pin,f, in combination with an apertured block, e, as shown and described.

3. In a. burglaralarm, the lever m, arranged to engage with its longer arm in a. notch of zo trigger l, as and for the purpose specified.

CEAS. F. CRARY.

Witnesses:

GEO. D. WALKER, C. SEDGWICK.

Images