US1100633A - Alarm-lock. - Google Patents

Description

G. G. TUGH.

ALARM LOCK.

APPLICATION FILED OUT. a, 1913.

Patented June 16,1914.

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UNITED STATES PATENT QFFICE.

CHRISTIAN CARL TUCH, OF HONOLULU, TERRITURY OF HAWAII.

ALARM-LOCK.

To all whom it may] concern Be it known that I, CHRISTIAN C. TUCH, a citizen of the United States, residing at Honolulu, in the county of Honolulu and Territory of Hawaii, have invented new and useful Improvements in Alarm-Locks, of which the following is a specification.

This invention relates to improvements in alarm locks and has particular application to a door lock wherein the sliding of the bolt to unlocking position will automatically close an electric circuit to sound an alarm.

In carrying out the present invention, it is my purpose to provide a lock of the class described wherein the contacts forming the terminals or" the electric circuit will rest upon the locking bolt and hold the latter seated within the casing, such contacts performing the dual function of contacts and holding springs.

It is also my purpose to provide a device of the class described which will embrace the desired features of simplicity, efiiciency and durability and one which may be installed and maintained at a minimum exense.

lVith the above and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claims.

In the accompanying drawing; the figure is a vertical central sectional view through a door lock constructed in accordance with my present invention.

Referring now to the accompanying drawing in detail, the numeral 1 designates a casing having a slot 2 formed in one end wall thereof. Mounted within the casing and seated upon the lower wall thereof are blocks 3, 3 constituting a seat for the locking bolt 4:, the latter being capable of sliding movement within the casing upon the seat formed by the blocks 3, 3 and adapted when in locking position to be projected out of the opening 2 so as to engage the keeper.

In the present instance, the under surface of the locking bolt 4 adjacent to one end thereof is formed with a series of transverse grooves 5 suitably spaced apart and adapted to interchangeably receive ribs 6 formed on the upper surface of the adjacent block 8. The side wall of the casing is formed with a keyhole 7 disposed in a plane below the under surface of the locking bolt,

Specification of Letters Patent.

Application filed October 3, 1913.

Patented June 1 5, 1914.

Serial No. 793,245.

while such surface of the bolt adjacent to the keyhole is formed with a groove 8. By means of this construction, it will be seen that when the key is inserted in the keyhole and rotated, the wing thereon will engage in the groove 8 and in the turning movement of the key the grooved end of the locking bolt will be lifted so as to relieve the bolt of the influence of the ribs 6, 6 whereby the bolt will be slid to locking position in the continued turning movement of the key. When the bolt is relieved of the influence 0f the key, the grooved end thereof again reseats upon the respective block and the ribs 6, 6 on such block reenter the grooves 5, 5 so as to retain the locking bolt in active position.

Suitably fastened to the opposite end walls of the casing 1 are spring contact fingers 9, 9 having the lower ends thereof curved upwardly as at 10 and bearing upon the upper surface of the locking bolt 4:, while the upper surface of the latter, at a point approximately centrally thereof, is provided with a metallic insert 11 of conducting material, the remaining portion of the upper edge of the bolt being covered with insulating material. The fingers 9, 9 are connected to the opposite terminals of an electric circuit 12 including a suitable source of electrical energ Y and an audible signal such, for instance, as a bell 13.

From the foregoing description taken in connection with the accompanying drawings, the construction, mode of operation and manner of employing my invention will be readily apparent. When the bolt 4 is in locking position, as illustrated in the drawing, the metal insert 11 in the upper surface of the bolt engages the lower end of one of the fingers and is out of engagement with the lower end of the other finger so that the electric circuit 12 is broken. On the other hand, when the bolt is retracted, the metallic insert 11 bridges the lower ends of the contact fingers 9 and so closes the circuit 12 whereby the alarm 13 is sounded to ad vise the occupants in the structure in which {he device is installed of the opening of the ock.

It will be seen that I have provided an alarm lock wherein the contact fingers form ing the terminals of the electric circuit perform the two-fold function of terminals and sprin s so as to maintain the locking bolt seated and restore the same to engagement with its seat subsequent to the actuation of the bolt by the key.

I claim:

1. In a door look, a casing, a locking bolt seated within said casing and adapted for sliding movement therein, a metallic insert in the upper edge of said bolt, and spring contact fingers secured to the opposite ends of said casing and bearing upon the upper edge of the bolt and adapted to hold the bolt seated and close an electric circuit when bridged by said insert.

2. In a door lock, a casing, blocks mounted upon the bottom wall of said casing and forming a seat, transverse ribs upon the upper surface of one of said blocks, a locking bolt seated upon said blocks and capable of sliding movement thereon and having transverse grooves formed in the under surface thereof adapted to receive said ribs, spring contact fingers carried by the opposite end walls of said casing and bearing upon the upper surface of sald bolt and forming the terminals of an electric circuit, and a metallic casing in the top edge of said bolt and adapted to bridge said fingers when the bolt is in unlocked position.

In testimony whereof I aflix my signature in presence of two witnesses.

CHRISTIAN CARL TUCH.

Witnesses CARMEN VIDA, FRANK J. PRUGER.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patent, Washington, D. C.

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