US1100681A - Electric lock and alarm apparatus. - Google Patents

Description

0. NITSCH. ELECTRIC LOOK AND ALARM APPARATUS. APPLICATION FILED JAN. 29, 1914.

1,100,681, Patented June 16,1914.

COLUMBIA PLANouRAPH CO..WASHINGTDN, D. c.

UNITED STATES PATENT OFFICE.

OTTO NITSCH, OF HARBURG-ON-THE- ELBE, GERMANY.

ELECTRIC LOCK AND ALARM APPARATUS.

To all whom it may concern Be it known that I, Or'ro Nrrsorr, a subject of the King of Prussia, and resident of 2 Wilsdorferstrasse, Harburg on the-Elbe, in the Empire of Germany, have invented a new and useful Improved Electrical Lock and Alarm Apparatus, of which the following is a specification.

The present invention relates to an im proved electric safety device for door locks in combination with a signal or alarm apparatus.

Special objects of the invention are to render more eflicient, serviceable and durable in operation safety devices of the kind referred to.

With these ends in view the invention consists in the novel combination, arrangement and adaptation of parts, all as more fully hereinafter explained, shown in the accompanying drawings and finally set out in the appended claim.

In the annexed drawing is shown diagrammatically one mode of carrying into practice my invention.

My invention being suitable for door locks of any desired type which employs a slidable bolt for locking the door, I have deemed it unnecessary to illustrate the door.-

lock, but have restricted the illustration to the slidable bolt, which is essential in the combination constituting my invention.

The slidable bolt a, besides the ordinary arresting mechanism provided in the lock case, is under the influence of an accessory locking arrangement formed by the armature b of-an electromagnet 0 This accessory locking arrangement is rendered effective by means of a nose 0 on the armature Z2 entering a notch (Z or e of the slidable bolt a, the notches d and 0 being provided in such co-relative positions that the slidable bolt on assumes its locking position when the nose 0 enters the notch d and that it assumes its inoperative position when the nose 0 enters the notch e.

The armature Z) is pivotally attached to the lock case by means of the pin f in such a position, that it separates from the notch (Z or a respectively on being energized, thus liberating the bolt 0; which can then be moved either in one or the other direction.

The electromagnet 0 is in conductive connection with the source of electricity g by means of suitably arranged and protected line wires, the electric circuit containing Specification of Letters Patent.

Application filed January 29, 1914.

Patented June 16, 1914.

Serial No. 815,577.

also the cut out it and the push-button switch 2'. A second push-button switch 7 is arranged in the proximity of the door lock at the outside of the door, in order to enable the door lock to be opened from outside. This second puslrbutton switch is is fitted for two contacts Z and m so that on its actuation the alarm bell n rings previous to the liberation of the slidable bolt a from the lever armature b. The contact Z closes an electric circuit over the line wire 0, the bell n, the line wire 2), the source of electricity 9 and the line wire (7 and thus actuates the alarm bell a. When the push-button 70 reaches the contact m an electric circuit is closed, which contains the electromagnet 0 this electric circuit being constituted by the source of electricity g, the line wire q, the push-button 7c, the electromagnet 0 the line wire 8 and the cut out h. On thus energizing the electromagnet c the armature b is attracted and in consequence thereof the slidable bolt 0; is disengaged from the nose 0, so that the door lock can be opened.

When it is required to open the locked door from inside, the push-button c in the proximity of the source of electricity 9 has to be actuated. The electromagnet c is in this case energized by the current flowing through the circuit constituted by the source of electricity g, push-button i, line wire 1", electromagnet 0 line wire 8 and cut out it.

The electromagnet 0 thus attracting the armature b, the door can be opened and locked again. The alarm bell n is also sounded when opening the locked door from inside but by only one electric circuit, which is caused by the armature Z) touching the contact 25. This electric circuit is closed over the source of electricity 9, the pushbutton 41, the line wire a", the electromagnet 0 the contact 25, the line wire 0, the alarm bell n and the line wire 29.

If an unauthorized person attempts to open the locked door from outside and, to prevent the alarm apparatus from being sounded, tries to evade the push-button 72 by conductively connecting the contacts a and m, say by means of a piece of wire, the alarm bell a still sounds by virtue of the electric circuit closed over the source of electricity g, line wire g, wire connecting a and m at the push-button 7c, armature contact t, line wire 0, alarm bell n and line wire 22. This actuation of the alarm apparatus is independent from the cut out it.

The improved locking and alarm arrangement affords a reliable insurance against the opening of locked doors by unauthorized persons.

What I do claim as my invention, and desire to secure by Letters Patent, is:

The combination with the bolt of a door lock, of an electromagnet, a pivoted arma ture lever, a nose thereon adapted to engage in a notch in the bolt both when thrown and when retracted, a spring contact touching the armature lever when same is attracted, line wires separately leading from the electromagnet, the armature lever and the spring contact to a common source of electricity, an alarm bell, a cut out and a pushbutton preferably arranged in close proximity to the source of electricity inside the door and in conductive connection with the electromagnet, the armature lever and the spring contact, a push-button outside the door near the door lock, two contacts for this push-button arranged in conductive connection with the source of electricity and the electromagnet for releasing the door lock, so that the alarm bell sounds even if the ordinary alarm circuit is intentionally disturbed previous to actuating the push-button for electrically releasing the bolt of the door lock, substantially as described and shown and for the purposes set forth.

In witness whereof I have hereunto signed my name this 17th day of January 1914, in the presence of two subscribing wltnesses.

OTTO NITSCIL lVitnesses FRIEDRICH MANHISER, ERNEST H. L. MUMMENHOFF.

Copies of this patent may be obtained foi five cents each, by addressing the Commissioner of latents, Washington, D. (3.

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