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Publication numberUS1100846 A
Publication typeGrant
Publication dateJun 23, 1914
Filing dateJul 24, 1913
Priority dateJul 24, 1913
Publication numberUS 1100846 A, US 1100846A, US-A-1100846, US1100846 A, US1100846A
InventorsWilmer L Rombaugh
Original AssigneeWilmer L Rombaugh
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Burglar-alarm device.
US 1100846 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



Patented June 23,1914.




Specification of Letters Patent.

Application filed July 24, 1913.

Patented June 23, 1914.

Serial No. 781,033.

To all whom it may concern Be it known that I, W'ILMnR L. ROM- nauorr, a citizen of the United States of America, residing at Rivera, county of Los Angeles, State of California, have invented a certain new and useful Burglar-Alarm Device; 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.

This invention relates to burglar alarm devices, and it may be said to consist in the provision of the novel and advantageous features and in the novel and improved construction, arrangement, and combination of parts as will be apparent from the description and claim which follow hereinafter.

One object of the invention is to provide a novel and improved burglar alarm device, which can be easily and quickly applied to a door or window, and is adapted when the door or window is moved to cause explosion of a suitable paper cap or the like to cause a loud report such as made by a discharged fire-arm.

Further objects of the invention are to provide a novel and improved burglar alarm device which is simple and compact in construction, strong and durable, easily portable, readily applied in use, effective in action, neat and attractive in appearance, in which the parts may be quickly assembled or dismounted, and in which most of the working parts are hidden from view to avoid divulging the nature of the device and prevent tampering therewith.

Other objects and the advantages of the invention will be apparent to those skilled in the art from a consideration of the following description of the preferred form of construction embodying the invention, taken in connection with the accompanying drawings in which- Figure 1 shows the device applied to a door; Fig. 2 shows the device applied to a window; Fig. 3 is an enlarged broken and sectional view taken on the line 33 of Fig. 2; Fig. 4 is a plan view of the device, Fig. 5 is an end elevation of the device; Fig. 6 is a sectional view taken on the line 66 of Fig. 4, and showing the cord attached to the trigger; and Fig. 7 is a sectional view of the parts shown in Fig. 6 in changed position.

The barrel 8 has a cap 9 screwed on one end thereof and a cap 10 screwed on the other end thereof. Within the barrel 8 is movably arranged a plunger 11 which is provided with a groove 12 and has a stem 13 which latter passes freely through an opening in the cap 10 and has screwed on the end thereof, a rounded nut or head 14. Between the plunger 11 and the cap 10 is arranged a compression spring 15 which normally forces the plunger 11 toward and against the inner face 16 of the cap 9. The cap 9 is provided with an opening 17 whereby a suitable explosive paper cap 18 or the like may be inserted through notches 19 in the barrel 8 to be disposed against the face 16.

A base 20 is suitably aflixed to the barrel 8 and comprises vertical walls 21 between which on a pivot 22 is mounted a trigger 23 which is pressed by a spring 24 arranged between the vertical walls to have one end thereof, which extends into an opening 23' in the barrel 8, move into the groove 12 and hold the plunger 11 in retracted position when the head 14 is pulled to retract the plunger 11 against the pressure of the spring 15. The other end of the trigger 23 has suitably attached thereto a cord 25 which passes over a round bar or roller 25 mounted on the base 20 between the vertical walls 21 and may be provided with a loop 26 for connection with a snap hook 27 on another length of the cord 25.

In use the device may be secured to the door frame 28 or to the window sash 29 by means of suitable thumb tacks or the like 30.

The device being set with the plunger 11. in retracted position and a paper cap or the like being placed against the face 16, it will be understood that the cord 25 may be suitably attached to the door 31 or to a window so that when the door or window is opened the cord 25 will release the trigger 23 and the spring 15 will force the plunger 11 toward the face 16 and explode the paper cap and cause a loud warning report.

In applying the device to a window, it may be secured to'the sash of the lower window and the cord 25 may pass over the top of that sash and be suitably secured to the sash of the upper window, see Fig. 3, so that the device will be actuated should the lower window be moved upwardly or the upper window be moved downwardly.

I claim:

A burglar alarm device comprising a bar- 0 lnovably arranged in the barrel and provided with a stern passing through the other of the caps, said plunger provided Witha groove therein, a spring arranged in the barrel and adapted to force the plunger against said face to explode the paper cap, a base aflixed to the barrel, and comprising vertical Walls, a pivot extending between the fit into said groove to hold the plunger in retracted position against the pressure of said spring, a roller arranged between the vertical walls, and a cord attached to the other end of the trigger and passing over the roller and adapted to release said trigger from engagement with the plunger when a pull is exerted on the cord, substantially as set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses at Los Angeles,

, county of Los Angeles, State of California, this 18th day of July A. D. 1913.

vertical Walls, a spring arranged between the vertical Walls, a trigger mounted on the pivot and having one end thereof adapted to WILMER L. ROMBAUGH.



fibiiiei of 1115 patent may be olitalind for five cents each, by addressing th Commifimir' of rates.

Wahifigton, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4142478 *Nov 16, 1977Mar 6, 1979Sentry Products, Inc.Ultrasonic signal generating device
U.S. Classification116/88
Cooperative ClassificationG08B15/00