US1675878A - Burglar alarm - Google Patents

Description

Juiy 3, 1 928. 1,675,878

- J. M. CODY BURGLAR ALARM Filed Jan. 24, 1927 gwuentoz damesA/l 604 Patented July 3, 1928.

UNITED STATES JAMES M. CODY, OF SEATTLE, WASHINGTON,

BURGLAR ALARM.

Application filed January 24, 1927. Serial No. 163,026.

The invention is an alarm that is embodied in a small complete unit that may readily be attached to a door knob or the like and which is constructed so that it will immediately give an alarm as soon as the door knob is turned slightly.

The object of the invention is to provide a simple and eflicient burglar alarm.

Another object of the invention is to provide an alarm that may readily be attached or removed.

Another object of the invention is to provide a burglar alarm embodying a small casing which is complete in itself.

A further object of the invention is to provide a simple burglar alarm that may readily be adjusted to operate as desired.

A still further object of the invention is to provide a. simple and efficient burglar alarm that may be hung upon a door knob and may also be attached to a. window by a cord or any other object so that the alarm will operate when it is moved.

And a still further object of the invention is to provide an alarm that automatieally operates by gravity, and that is of a simple and economical construction.

With these ends in view the invention embodies, a small casing having a pivotally mounted clip in the upper portion thereof, a bell in the lower portion thereof, a spring for operating the bell, means for holding the bell clapper and'means for releasing the clapper holding means as the object upon which the clip is placed is rotated.

Other features and advantages of the invention will appear from the following description, taken in connection with the drawings, wherein:

Figure 1 is a view showing the device as it would appear in use.

Figure 2 is a front view of the device.

Figure 3 is a similar view on a large scale with a part broken away.

Figure 4 is a cross section through the center of the upper part of the casing.

In the drawings the device is shown as it would be made, wherein numeral 1 indicates the casing, numeral 2 the clip and numeral 3 the bell.

The casing 1 is made as shown with an upper portion 4 and a lower portion 5 and the upper portion is provided with a round pin 6 which projects through the rear and to which the clip 2 is attached. At the rear of the casing is a disc 7 which is mounted upon the pin 6 and the fingers 8 and S) of the clip are attached to this disc. The pin 6 is free to rotate in the casing 1 and at the inner end of the pin is a square projection 10 upon which a member 11 is rigidly mounted so that as the pin 6 is rotated one end of the member 11 will move upward and the other downward. The outer ends of the lever 11 as indicated by the numeral 12 engage ro- Jections 13 on a member 14, which is slidably held on the pin 6 and which is provided with a tongue 15 that projects through an opening in a partition 16, as shown. A spring 17 is provided between the pin 6 and the lower portion of the member 14 to resiliently hold the member downward. It will be observed that as the pin 6 is rotated one of the ends 12 will bear against one of the projections 13 and thereby cause the member 14 to slide upward and as soon as the pin is relea ed the spring 17 will move the member 1 1 backward to the position shown.

In the lower portion 5 of the casing 1 is a bell operated by a clock spring which may be of any suit-able design or arrangement. In the design shown the shaft 18 upon which the clapper 19 is mounted is provided with an arm 20 which normally engages the tongue 15, as shown in the drawing, and thereby prevents the clapper operating. It will be observed that when the tongue 15 is raised, as hereinbefore described, the arm 20 will be released and the bell will be permitted to ring.

The face of the casing 1 may be provided with a pivotally mounted. lever 21 which may extend into the bell casing and engage the arm 20 to hold it to prevent its operating when it is not desired to use the device. A hook 22 may also be provided which may be hooked in a small opening in the bottom of the casing and attached by a cord 23 to a window or other object so that as the object is moved it will pull the cord, which will move the casing and thereby cause the bell to ring.

It will be understood that changes may be made in the construction without departing from the spirit of the invention, one of which changes may be in the use of a bell of another design, another may be in the use of other means for attaching the device to a door knob or other object and still another may be in the use of other means for causing the bell to ring as the object is turned.

The construction will be readily understood from the foregoing description. To

Letters Patent, is

use the devieeit may-be placed upon adoor knob, asshown'in Figure 1 and it will be-0bserved that as soon as the door knob isslight ly turned it will tWistt-he pin-Gandthereby raise the tongue 15 so that the hell Will ring immediately, or if the cord 23 is attached; to the window, or other object it will pull the casing to one side as the object is movedandtherel-y release the clapper so that the bell Willring.

' It is also understood that altl'io this device is described as aburglar alarm it may he used as a A doorbell or for any other suitable purpose: V r 7 Having thus fully describedmy invention- What I clann as new. and'dcsiretose'c'ure'by Ina-nala-rmz of he class described, acasing, abel-l in the casingopcrable by a: spring, means for winding the said spring, alever slidably-and vertically mounted in said casingand positioned to engage said bell clapper to prevent the bell ringing, a horizontal lever: passing through a slot in the said vertical lever and'adaptalole to raise the said vertical lever to-release the said hell clapper with either end as either end is raised, said horizontal lever mounted upona shaft extending through the said casing andadaptable toturnas-the'said shaft is rotated, andmeans on the outer end of the said shaft for attaching the said device to a door knob or the like to cause the shaft to rotate with the knob While the casing hangs vertical,

In testimony whereof I afiixinysignature.

- JAMESl i. CODY.

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