US1199638A

US1199638A - Burglar-alarm lock.

Info

Publication number: US1199638A
Application number: US8960716A
Authority: US
Inventors: August F W Viehweger
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-04-07
Filing date: 1916-04-07
Publication date: 1916-09-26
Anticipated expiration: 1933-09-26

Description

A. F. W. VIEHWEGER.

BURGLAR ALARM LOCK.

APPLICATION FILED APR. 7. 191a.

Patented Sept. 26, 1916.

2 SHEETSSHEET 1.

WHY. e99! MM A. F. W. VIEHWEGER.

BURGLAR ALARM LOCK.

APPLICATION FILED APR- 7. 1916.

1 ,1 99,638. Patented Sept. 26, 1916.

2 SHEETSSHEET 2.

AUGUST F. W. VIEHWEGER, OF HOBOKEN, NEW J ERSEY.

BURGLAB-ALARM LOCK.

Specification of Letters Patent.

Patented Sept. 26,1916.

Application filed April 7, 1916. Serial No. 89,607.

To all whom it may concern:

Be it known that I, AUGUST F. W. VIEH- WEGER, a subject of the Emperor of German residing at Hoboken, in the county of udson and State of New Jersey, have invented certain new and useful Improvements in Burglar-Alarm Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to a combined lock and burglar alarm.

The object of the present invention is to provide a simple, practical and comparatively inexpensive combined burglar alarm and lock adapted to be readily applied to doors and capable when set of enabling the door to be opened by a. proper key without sounding the alarm and adapted also should an attempt be made to open the lock with a false key or to pick the lock to sound a burglar alarm and continuously operate the same.

A further object of the invention is to provide a device of this character adapted to be readily applied to various kinds of door locks for rendering the same burglar proof and for sounding an audible alarm in event of an attempt to pick the lock.

With these and other objectsin view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings Figure 1 is a perspective view of a door lock constructed in accordance with this invention and arranged in circuit with a burglar alarm, Fig. 2 is a vertical longitudinal sectional view through the lock, Fig. 3 is a transverse sectional view on the line 3-3 of Fig. 2, Figs. 4 and 5 are detail erspective views of the latch bolt, Fig. 6 1s a detail view of the hub member of the knob for actuating the bolt from the interior, Fig. 7, is a detail perspective view of the slidable contact member, Fig. 8 is a detail view of the key.

construction is preferably provided with a removable face plate 4 having a flange 5 designed to be arranged in a suitable mortise or recess at the edge of the door. The bolt is provided at its rear portion with a longitudinal slot 5 in which extends a horizontally disposed supporting and guiding arm 6 having an attaching portion 7 which is suitably secured to the rear wall of the lock casing as clearly illustrated in Fig. 2 i

of the drawings. The bolt is provided at the inner side with upper and lower shoul ders 8 which are adapted to be engaged by a hub member 9 pivoted intermediate of .its ends to a spindle 10 of a knob 11 located at the inner face of the door, not shown, and adapted to be turned to cause the hub member to engage one or the other of the upper and lower shoulders 8 for retracting the slidable bolt 1 against the action of a coiled spring 12. The coiled spring 12 which is secured at its rear end to the upper portion of the lock casing is connected at its forward end to the up er arm of an inclined lever 13 fulcrumed intermediate of its ends on a pivot 14 and having in its lower arm a slot 15 for the reception of a suitable pivot 16 that is carried by the bolt. The pivot 16 which may consist of a screw is mounted in an opening 17 of the slidable bolt which is normally maintained in an extended position by the spring 12. The pivot 14 of the lever 13 has also mounted on it a catch 18 extending upwardly and forwardly from the pivot 14 and consisting of an arm provided with a lower engaging portion or tooth 19 and normally su ported in an elevated position with the said tooth 19 out of engagement with a recess 20 of the bolt by a leaf spring or plate spring 21. The spring 21 is secured at its rear end to the upper wall of the lock casing and the forward end is connected with the front portion of the arm of the catch as clearly illustrated in Fig. 4 of the drawings.

The catch may consist of a single piece of sheet metal bentv to form the tooth or engaging portion and a flange 22 which engages the front end of the spring 21. The

notch or recess 20 is formed in the upper edge of the slidable bolt at the front portion thereof and it is located below the tooth or engaging portion of the catch when the bolt is in its extended position. The catch is adapted to be depressed and maintained in engagement with the recess 20 by an operating device 23.

The operating device 23 consists of a head and a stem 24 provided with projecting lugs 25 adapted to extend through slots 26 in the top wall of the casing so that the operating device 23 may be depressed and partially rotated to force the catch into engagement with the latch bolt and lock the catch in such engagement. This will efi'ectually prevent the bolt from being retracted or operated from the exterior.

The slidable bolt is provided in its lower portion with a recess 27 forming a shoulder 28"and adapted to receive the engaging portions 29 of a key 30 for enabling the key to engage the shoulder 28 and retract the bolt. The key is provided with spaced bits 31 which may be arranged in a variety of ways which are also adapted to pass through recesses 32 of a slidable contact member 33 preferably consisting of an arched piece of metal which is connected at a point intermediate of its ends to a stem or shank 34 of a knob 35. The stem or shank 34 extends through a slot 36 in the lower wall of the latch casing and it is adapted to be engaged by a key and to be moved into electrical engagement or contact with a fixed contact member 37. The lock casing is provided at the outer side with a key hole 38 for the introduction of a key in the usual manner and any attempt to pick the lock with an ordinary key or pick will result in moving the contact member 33 into engagement with the contact member 37. This will operate to ring an electric bell 38 which may be mounted on the door or at any other convenient ploint and which is arranged in circuit wit the contact members when the same are in engagement with each other. The contact member 37 is mounted on the stem or screw 39 of a binding post 40 to which one of the conductor wires 41 of the electric circuit is connected. The wire 41 preferably extends to a suitable source of electric current supply 42 which may consist of one or more batteries or any other suitable means. The source of current supply is connected with the electric bell by a conductor wire 43 and the electric bell is also connected with ii binding 0st 44 by a conductor wire 45. The binding post is mounted on the lock casing and the contact member 37 is insulated from the lock casing and it will be clear that when the slidable contact member 33 is carried by a key or pick into engagement with the fixed contact member 37, the circuit will be closed and the bell continuously sounded until the circuit is again opened by moving the slidable contact member away from the relatively fixed contact member 37 Any other suitable alarm or signal may be arranged in circuit with the bell as will be readily understood and the fixed and movable contact with the electrical connection may be applied to various forms of locks with the movable contact arranged in the path of the key or in the circle described by the'bits of the key so that when a proper key is not used and attempt is made to surreptitiously open the door to which the lock is applied the circuit will be closed. It will be seen that the character of the key and the construction of the adjacent end of the movable contact member may be correspondingly varied.

No claim is made in the present application to the lock structure, as this forms the subject matter of a separate application.

What is claimed is 1. A look including a key actuated bolt, a fixed contact member carried by the lock, a

movable contact member mounted in the lock and extending into the are described by the key and having an opening or cut away portion to permit the passage of a proper key without actuating the movable contact member and adapted to be moved into engagement with the fixed contact by an improper key or device for closing an electric circuit, and an exteriorly arranged operating device connected with the movable member for moving the same away from said fixed contact member, said movable tending into the path or are of movement of the key of the lock and adapted to permit the passage of the same and to be actuated by an improper key or instrument so as to be moved into contact with the fixed contact member and an operating device having a shank or portion extendlng into the lock from the exterior thereof and connected with the slidable contact member for moving the same away from the fixed contact 13 member.

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

AUGUST F W. VIEHWEGER.

Witnesses: V

' CHARLES FAIsT, OTTO Gi'm'rnnn.