US1197689A - Signal-alarm. - Google Patents

Description

W. J. VAN OSDEL.

SIGNAL ALARM.

APPLICATION FILED MAR. 8,.19 l5.

1 1 97,689 Patented Sept. 12, 1916.

WILLIAM J. VAN OSDEL,

OF CHICAGO, ILLIN 'OIS, ASSIGNOR 0F TWO-THIRDS 'IO LOUIS SPERLING, OF CHICAGO, ILLINOIS.

SIGNAL-ALARM.

Specification of Letters Patent. Patented Sept, 12, 19-16,

Application filed March 8, 1915. Serial No. 12,776.

To all whom it may concern:

Be it known that I, VVILLIAM J. VAN Os- DEL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Signal-Alarms, of which the following is a specification.

This invention relates to improvements in signal alarms, particularly adapted, though not necessarily limited in its use for attachment to a closure casing to indicate the opening of the closure. Heretofore in devices of this character, it has been necessary to open the closure to a considerable extent in order to actuate the alarm, thereby rendering it possible for the intruder to insert his hand or an instrument to destroy or mutilate the device to such an extent that it would not operate. a

To overcome these objections and difliculties and to provide an improved device of this character which will sound an alarm as soon as the closure is moved or before it is opened to any appreciable extent, is one of the objects of this invention.

A further object is to provide an improved, simple, durable, cheap and effective bell construction for imparting a vibratory alarm.

To the attainment of these ends and the accomplishment of other new and useful objects, as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described, and claimed and shown in the accompanying drawing illustrating the invention and in which,

Figure 1 is a front elevation of a portion of a door and the casing therefor showing an attachment applied thereto constructed in accordance with the principles of this invention. Fig. 2 is a detail sectional view taken on line 22, Fig. 3. Fig. 3 is a view taken on line 3-3, Fig. 1.

Referring more particularly to the drawing, the numeral 10 designates the door casing, and 11 the door. The alarm comprises a base 12, a portion of whichis shaped to form an e e or loop 13 and mounted upon this base 1s a stud 14 about which an escapement ratchet 15 rotates, and this escapement ratchet actuates an escapement 16 having a hammer 17 connected therewith. A

ratchet 18, is also rotatably supported by the stud 14, and is operatively connected with the ratchet 15 by a spring controlled pawl 19, pivotally connected with the escapement ratchet 15. A spring 20 is connected by one extremity with the ratchet 18, and is anchored by its other extremity as at 21. The bell 22 is supported by the stud 14 and is detachably connected with the ratchet 18 by means of lugs 22, entering suitable recesses in the hub of the ratchet 18, in such a manner that when the bell is rotated with respect to the base 12, it will turn the ratchet 18, the dog 19 yielding to permit the ratchet to turn to wind the spring and the escapement ratchet 15 is held against rotation while the spring is being wound, by means of a catch 23 engaging between the teeth of the escapement 15. This catch is pivotally supported by the base 12, so that its extremity 24 will engage between the teeth of the escapement ratchet 15 to lock the latter to maintain the spring 20 against unwinding, and the extremity 25 of the catch projects over the eye or loop 13 formed on the base 12, so that when the catch 23 is tripped, the portion 25 will engage the eye or loop and will form a stop for the catch. When thus released, the escapement 15 will be rotated under the influence of the spring 20 to vibrate the hammer 17 In order to hold the spring 20 from contacting with the bell 22,

plates 26 may be provided between whichthe spring is arranged.

Connected with the catch 25 is one end of a flexible member 27 which passes through the eye or loop 13 and is adapted to be wound about the shank 28 of the door knob 29, and the free extremity of the flexible member is formed into a hook adapted to hook into one of the links of the flexible member. When the device is thus in position, all that is necessary to set the same, is to wind the spring by rotating the bell, the catch 23 holding the ratchet 15 during the winding operation. When the closure 11 is moved, it will be manifest that the catch 23 will be tripped and the end 25 will be drawn against the eye or loop 13 to stand thereacross nd the latter will not only serve as a stop for the catch, but will also relieve the pivot of the catch as well as the remaining portion of the mechanism against any strain due to the opening of the closure. The extremity of the catch may be shaped to form a handle 31, if desired, by means of which the catch may be manipulated.

With this improved device it will be manifest that the device may be employed as a door chain bolt, inasmuch as the catch 28 will engage the eye 13, and all strain of the flexible member will be exerted upon the eye 13 and not upon any portion of the bell operating mechanism.

That is claimed as new is:

1. An alarm embodying a bell for securing to a closure casing, actuating means embodying a motor device, a catch pivotally mounted intermediate its ends to move in a vertical plane for controlling the motor device, a flexible member connected directly with one end of the catch for rocking it to release the motor device, the free end of the flexible member adapted to be wrapped around a door knob and detachably engage the flexible member, a combined guide loop and stop extending across the path of movement of said catch to limit the extreme downward movement of the catch, whereby the pivot of the catch is relieved from strain when the flexible member is drawn taut;

paid flexible member extending through said 2. A device of the character described, embodying a base plate, a guideloop to one side of and integral with said plate, bell motor mechanism supported by said plate, a pivot post on said plate disposed at right angles to the axis of the guide loop, a catch mounted on said post to move in a vertical plane for controlling the motor, the outer end of said catch extending beyond and transversely of the opening of said loop and normally out of engagement therewith, a flexible member connected to said catch and extending through the said loop; whereby when the flexible member is pulled it moves the said catch into engagement with said loop which limits its further movement, and relieves the mechanism from strain when the flexible member is drawn taut.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 4th day of March A. D. 1915.

WILLIAM J. VAN OSDEL.

Witnesses:

LOUIS SPERLING, J. H. J ocHUM, Jr.

coplel of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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