US1242547A - Burglar-alarm. - Google Patents

Description

S. H. HARRINGTON.

BURGLAR ALARM.

APPLICATION FILED M05. 1914.

Patenmd Oct. 9, 1917.

2 SHEETS-SHEET I.

S. H. HARRINGTON.

BURGLAR ALARM.

APPLiCATION men 0505, 1914.

Patented Oct. 9,1917.

2 SHEETS-SHEET Z INVENTOR mechanism operated by the door;

smear. H. HARRINGTON, OF NEW YORK, N. Y.

BURGLARALARM.

Specification of Izetters Patent.

Patented Oct. 9, 191 7.

Application filed December 5, i914. serial'uo. 875,555.

To all whom it may concern.-

Be it known that I, SA UE II. Hana vo- 'ro-N, a citizen of the United btates, residing at the borough of Manhattan, in the city, county, and State of New York, have invented a certain new andus'efu'l Improvement in Bur lar-Alarms, of which improvement the fol owing is a specification.

This invention relates to burglar alarms, and has for its object to provide a simple and inexpensive mechanism which may be readily attached to an ordinary alarm clock, and be operated by the movement of a door, window, or other closure, to actuate the alarm setting stem of the clock, and cause the alarm to ring. It may also be connected up to turn on a li ht and to raise the receiver hook of the telep lone instrument.

y improvement is particularly adapted for use in a bed-room of a residence or apartment, where the clock may be placed upon a table, shelf, or other support in close proximity to the telephone instrument, and be readily connected to a chandelier or wall light, and a preferred construction comprises a frame for holding the casing of the ordinary alarm clock and carrying a trip device for turning the setting stem to such position as will set off the alarm, there being a releasing means controlled by the movement of the room door for starting the trip device. The releasin arm may also be mounted on the clock rame, and according to another feature of my improvement, is so connected With the W nding stem of the alarm that the alarm spring is automatically wound up by necessary movement of the releasing arm in settin thetrr device, This eliminates the possi ility o ne lecting to Wind up the alarm at the time 0 setting the mechanism in osition for operating. The movement of the releasing arm when actuated by the winding stem at the time of the ringing of the alarm may also be utilized for turning on a light and for raising the telephone receiver hook. v

In the accompanying drawings: Figure 1 shows, in front elevation,,the alarm clock and telephone instrument supported upon a. table and having connections with an electric light switch and with a Weight *ig. 2, a rear elevation, upon a larger scaleflof the clock and frame with one form of my im proved mechanism attached thereto; Fig. '3,

a side elevation of the same; Fig. 4, a front view of the door hook device for releasing the eight; Fig. 5, an end view of the same, showing part of the door in section and Fig. 6, an inverted plan of the base of the clock frame showing the gage for defining the position of the telephone instrument.

As shown in the drawings, there is rovided a clock frame, 10, of Wood, meta or other suitable material, having an opening of the desired size and shape to receive and hold the casing. 11, of an ordinary incxpensire alarm clock, having the usual alarm winding and setting stems, 12 and 13, respectively. A trip device for turning the alarm settin stem is mounted on the back of the clock rame, and as shown more particularly in Figs. '2 and 3, such device preferably comprises a trip lever, 14, in the form of a bell crank, pivoted at 17, to a bracket strip, 15, rigidly supported on the back of the frame, and a tension spring, 16, attached at its lower end to one arm of the trip lever and at its upper end to a fixed part of the bracket strip, 15. On the end of the alarm setting stem, 13, is fixed a small pulley or drum, 18, having a flexible cord or chain, 19, connecting the same With the trip lever, 14.

When set in position for operating, the other arm of trip lever, 14, en ages the releasing arm, 20, which is al so pivo-tally mounted on the bracket, 15, and the spring, 16, which is then under tension, is substantially in line with the pivot, 17, 0f the trip lever so that it has little or no effect toward turning the trip lever and the friction of the parts is sufficient to hold them in position. The releasing arm is preferably curved upward at its end and conn'ected by the flexible cord or chain, 2 2, with the small drum or pulley, 21 fixed on the end of the alarm Winding shaft or stem, 12, of the clock. The arm is also provided with an extension, 25, on the other side of its pivot, and may carry a. movable Weight, 28, which normally holds the am against the upper stop pin, 23. In this condition there is no pressure exerted by the releasing arm upon the trip lever, 14, but when the Weight, 28, is raised from the arm, the pressure of the same acting upon the arm of the trip lever is sufliicient to start the movement of the same upon its pivot, 17 and as the force of the spring, 16 tending to turn the trip lever, increases as its effective leverage in creases, the trip lever will be rapidly turned and acting through the chain, 19, and pulley, 18, will rotate the alarm setting stem or shaft, 13, sufficiently to set off the alarm of the clock. During the ringing of the alarm, the Winding shaft, 12, is rotated by its spring, thereby winding up the chain, 22, and turning the releasing arm, 20, downward to its lower position against the stop pin, 24, as indicated in dotted lines. In order to reset the trip lever it is first neces sary to raise the releasing arm to its upper position, and in doing so the alarm Winding shaft, 12, is automatically rotated by the chain and pulley connection.

Any suitable or preferred form of mecha nism controlled by the movement of the door or other closure may be employed for causing the release of the trip lever, but, as shown in Figs. 1, l and 5, of the drawings, there is provided a slillable and rotatable bolt, 30, mounted in a bearing, 31, secured to the door frame and having curred hook, 232 and 33, at its opposite ends, either book being adapted to support a weight, 34', connected by a cord, 35, with the releasing arm or the counter balance weight, 28, therefor. The hooks, 32, and 33, are preferably duplicates and are fixed upon the opposite ends of the bolt at such an angle to each other that when the weight, 3%, is suspended on one book, the other projects inward toward the door and is adapted to be turned by engagement with the door when the latter is moved from its closed position. Thus the preliminary opening movement of the door turns this hook and roial the bolt and the other hook sufficiently to cause the weight, 34, to fall, thereby exerting a pull upon the cord, 35, and raising the counter balance Weight 28, from the releasing arm, 20. The cord, 8.), passes over a suitable number of pulleys or screw-eyes, 36, to give it the desired location and direction. By sliding the bolt, 30, longitudinally, the end may be Withdrawn from the path of the door when it is desired to use the same freely Without in terfercnce With the alarm mechanism. The cord, 35, may also be connected by a branch cord, 35*, with a switch, 38, for turning on electric lamp, 37. When the releasing arm, 20, moves downward, the last part of the movement also operates to pull the cord, 47, which may be connected to turn on a light or other signal.

This movement of the releasing arm may also be utilized for raising the receiver hook of a telephone instrument, 40, and for this purpose the outer end, 25, of said arm is provided With a pin, 26, adapted to engage beneath the hook, 43, of th receiver, 42, and raise the same to the calling position, thus giving notice to. the telephone operator.

In order to readily adjust the position of the telephone instrument relative to the clock frame, a gage, 4-5, in the form of a semicircular arm, adapted to fit around the base, 41, of the telephone instrument, may be attached to the base of the frame, 10, and is preferably hinged thereto at 46, in such a manner that when not in use, it may be folded beneath the frame which is supported on four short legs. To adjust the telephone to its proper position, the base of the instrument is pushed into engagement with the curved arm, 45, and then turned therein until the side of the hook strikes the end, 25, of the releasing arm, 20. The pin, 26, will then be in position to engage the receiver hook.

To set the alarm mechanism in position for operating, the trip arm, H, and releasing arm, 20, are turned to the positions shown in full lines, Fig. 2, thus automati eally winding up the alarm, and the setting stem, 13. is then adjusted by means of a small handle on pulley, 1 to the desired time.

The locking bolt, 30, is then drawn out in front of the door and the Weight, 34, suspended upon the hook, 33. The telephone instrument may then be adjusted as above described. lnder these conditions, if the door should be moved from its closed position a slight distance, say from one half to three fourths of an inch, it engages the curved projection or hook, 32, and rotates the bolt, 30, and hook, 33, sufficiently to release the weight,3-l,which then fallsand exerts a pull upon the cord, 35, to lift the weight, 28, from its support on the releasing arm, 20. This weight may be provided with a slot, closed at its lower end, for engaging a pin carried by the arm, 20, in such. manner as to guide the Weight in its movement and prevent the same from becoming disconnected from the arm. When the arm is thus relieved from the counter-Weight, 28, it acts upon the trip lever, 14, with sufficient pressure to start the latter turning upon its pivot, assisted by the force of spring, 16, which rapidly increases as the lever turns, and operates to rotate the shaft, 13, of the clock to set off the alarm. The arm, 20, is then drawn down by its chain and pulley connection, to its lowest position and during the last part of this movement pulls the cord, 47, to turn on a light, and raises the telephone receiver hook to calling position.

When setting the clock alarm by hand, the alarm pointer on the face of the dial is turned in the direction of the arrow to the time that it is desired the alarm shall ring, in the usual Way, but it will be noticed that whenthc setting stem .is turned by the spring, 16, of tripping device, it is rotated direction reverse to the arrow, the setting stem and pointer will stop at the time indicated by the hands of the clock, and cannot move beyond thispoint. It, therefore, the alarm is set by hand forsomc hour, say seven oclock, and the mechanism should then be set in motion by an i11truder at tempting to open the door,say at two oclock in the morning, the alarm setting stem and pointer will be rotated by the spring, 16, to the two oolock mark on the dial where it will stop and the alarm will be set off. This also serves as an automatic indicator of the time that the attempt was made to open the door.

It will be observed that the bolt, 30, which projects in front of the door also serves as a lock tending to prevent the further movement of the door after the same has turned the hook to release the weight. This will have the effect to delay the burglar in forcing his entrance into the room and give further time for summoning help. This is an important feature of the invention, and it will be observed that with the form of bolt shown, the allowable initial movement of the door from its closed position is less than one half the thickness of an ordinary door, so that the door is not open, but is locked against any further movement in this direction, and there is no opportunity for the burglar to see through the crack between the door and its casing, nor to insert an instrument between the same. During this permissible initial movement of the door, however, the bolt is rotated to the limit of its movement, and the tripping mechanism, such as the weight and its connections, is released to set off the alarm and bring assistance before the intruder has gained access to the room.

Similar door hook devices located in adjoining rooms may be connected up by means of branch cords or wires, 35 to operate the same alarm mechanism, if desired.

Having now described my invention, what I claim as new and desire to secure by Let ters Patent is:

1. In a burglar alarm, the combination with an alarm clock having an alarm setting stem, of a closure, and mechanism operated by an opening movement of said closure for shifting the said stem to set off the alarm of the clock.

2. In a burglar alarm, the combination with an alarm clock having an alarm setting stem normally adjustable in one direction, of a closure, and mechanism operated by an opening movement of said closure for turning said stem in a reverse direction to thereby set off the alarm.

3. In a burglar alarm, the combination with an alarm clock having an alarm setting stem and a winding stem, of a trip device for turning said setting stem, releasing'means therefor connected with'th winding stem, aclosure. and mechanism operated by the opening movement of said closure for actuatingfthe releasing means.

'3 In a burglar alarm, the combination with. an, alarm else 5 having alarm winding and settin stems, of a trip devicefor turning siiid setting stem, a re eiis'ingarmfconnected with said winding stem whereby the alarm is wound up on setting the trip device, ,a closure, and mechanism operated by the opening movement of said closure for actuating the releasing arm.

5. In a burglar alarm, the combination with an alarm clock having an alarm setting stem, of a trip device comprising a trip lever and a spring, a pulley fixed on said stem and a connection from said trip lever to the pulley, said connection winding around said pulley, a closure, and mechanism controlled by the movement of the closure for releasing said trip device.

6. In a burglar alarm, the combination with an alarm clock having alarm winding and setting stems, of a trip device for turning said setting stem, a pulley fixed on said winding stem, a releasing arm engaging the trip device and having a flexible connection with said pulley, a closure, and mechanism controlled by the movement of the closure tor actuating said releasing arm.

7. In a burglar alarm, the combination with an alarm clock having winding and setting stems, of a trip device for turning said setting stem to set oil' the alarm, and 00 means operated by the movement of the winding stem for turning on a light.

8. In a burglar alarm, the combination with an alarm clock having winding and setting stems, of a trip device for turning 105 said setting stem to set off the alarm, a telephone receiver and supporting hook, and means operated by the movement of the winding stem for raising the receiver hook.

9. In a burglar alarm, the combination 110 with an alarm clock having winding and setting stems, of a trip device for turning said setting stem to set ofi' the alarm, a telephone instrument having a receiver and a hook for supporting the same, a gage at- 115 tached to the clock frame for defining the position of the telephone instrument, and means operated by the movement of the winding stem for raising the receiver hook.

10. In burglar alarm, the combination 120 with a door, and easing, of a rotatable bolt mounted on the casing and having a curved hook at one end to engage the door and a hook at the other end for supporting a Weight, and means operated by the fall of 125 the weight for sounding an alarm.

11. In a burglar alarm, the combination of an alarm, a door. a locking bolt for permitting a slight initial movement of the door from its closed position but less than 130 ated by said rotary movement of the bolt for setting ofi the alarm. V

'12. In a burglar alarm, the combination of an alarm, a door, a locking bolt having a partial rotary movement for permitting a slight initial movement of the door from 10 its closed position but preventing further movement thereof, and a weight adapted to be released by the rotary movement of the bolt for setting off the alarm.

SAlWUEL H. HARRINGTON. Witnesses:

W. R. WARNER, A. S. FOWLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G.

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