US1181914A - Burglar-alarm. - Google Patents

Description

VAN J. MILLER.

BURGLAR ALARM! APPLICATION FILED JULY 3. 1915.

L 11 91% Patented May 2, 1916.

5 awe/Mow THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

innit VAN J'. MILLER, OF ST. LOUIS, MISSOURI.

BURGLAIt-ALARM.

Specification of Letters Patent.

Application filed July 3, 1915. Serial No. 37,986.

To all whom it may concern:

Be it known that l, VAN J. MILLER, a citizen of the United States, residing at St. Louis, in the county of St. Louis and State of Missouri, have invented new and useful Improvements in Burglar-Alarms, of which the following is a specification.

This invention relates to certain novel and useful improvements in burglar alarm apparatus and has particular application to a mechanically operated burglar alarm.

In carrying out the present invention, it is my purpose to provide a burglar alarm which may be readily connected up with doors and windows, which will be held in inactive position as long as the doors and windows remain closed, and which will be rendered active immediately upon the opening of one of the doors or windows so as to notify the occupants of the premises of the attempted unlawful entry.

It is also my purpose to improve and simplify the general construction of mecl1anically operated burglar alarm apparatus and to provide apparatus which may be installed and maintained at minimum expense and which will operate efiiciently and effectively for its intended purpose.

With 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 claim.

In the accompanying drawing, Figure 1 is a plan View of burglar alarm apparatus constructed in accordance with the present invention. Fig. 2 is a cross sectional view through the same.

Referring now to the drawing in detail, 1 designates a baseboard. Pivotally secured to the baseboard 1 is a bell 2, a tapper 3 for the bell and a spring motor 4: connected with the tapper and designed to opcrate the same to sound the bell. Secured to the baseboard 1 and spaced apart in parallelism are guide tubes 5 and slidably mounted within the guide tubes 5 are the side bars of a substantially rectangular frame 6 formed of wire or other suitable material. Formed on one of the end bars of the frame 6 and projecting outwardly therefrom is a finger 7 adapted to enter the path of movement of the tapper 3 to hold the latter against operation under the action of the motor 4.

Disposed upon the baseboard 1 between Patented May 23, 191E.

the side bars of the frame 6 and lying parallel with one another and with the side bars of the frame are coiled retractile springs 8 having the ends thereof disposed adjacent to the end bar of the frame carrying the finger 7 fastened to the baseboard by means of screws 9 or the like and the remaining ends underlying the other end bar of the frame 6 and projecting outwardly beyond such end bar and curved upon themselves to form hooks 10 equipped with rings 11, respectively. The rings 11 are connected by means of wires 12 or analogous connections with the doors and windows of the building to be protected.

In practice, when the wires 12 are con nected with the doors and windows, the springs 8 are distended and remain distended as long as the doors and windows are closed and in this condition of the springs the frame 6 may be slid within the guide tubes 5 to engage the finger 7 with the tapper 3, thereby holding the latter against operation. When, however, one of the doors or windows is opened the particular spring connected with such door or window reacts and the hooked end of the spring engages the adjacent end bar of the frame 6 and slides the latter within the guide tube 5, thereby disengaging the finger 7 from the tapper 3 so that the tapper may be operated by the spring motor a to sound the bell and so warn the occupants of the premises of the attempted entrance to the building. Secured to the baseboard 1 are screws 13 disposed adjacent to the hooked ends of the springs and these screws are adapted to receive the rings 11 when it is desired to render the alarm apparatus inactive and as long as the rings are in engagement with the screws 13 the springs are held distended and the linger 7 permitted to hold the tapper against operation.

I claim:

In burglar alarm apparatus, a baseboard, a bell secured to said baseboard, a spring operated tapper adapted to sound said bell, guide tubes secured to said baseboard and spaced apart in parallelism, a substantially rectangular frame having the side bars thereof slidably mounted within said tubes,

a finger carried by one end bar of said frame and adapted to engage said tapper to hold the latter normally against operation, springs mounted upon said baseboard and confined within the space defined by said a frame and having the inner ends thereof secured to said frame and the outer ends formed to provide hooks encircling the other end bar of said frame, rings connected to the hook ends of said springs and wires connected to said rings and secured to the doors, and windows respectively of the protected structure and adapted to hold the springs normally under tension and to release said springs when the doors and Win doWs are opened whereby the springs will Copiesof this patent may be obtained for be permitted to react to engage the hook ends thereof with the adjacent end bar of said frame to slide the latter in said guide tubes to release said tapper.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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