US1251864A - Burglar-alarm. - Google Patents

Burglar-alarm. Download PDF


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US1251864A US15738017A US15738017A US1251864A US 1251864 A US1251864 A US 1251864A US 15738017 A US15738017 A US 15738017A US 15738017 A US15738017 A US 15738017A US 1251864 A US1251864 A US 1251864A
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James M Cody
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    • E05B45/00Alarm locks
    • E05B45/02Alarm locks with mechanically-operated bells


J. M. CODY. BURGLAR ALARM. APPLICATION FILED MAR. 26. I917- Patcnted Jan. 1, 1918.
Application and March 26,
' To all whom it may concern.-
Alarms, of which the following'is a specification.
My invention relates to an alarm device whlch is intended for attachment to the handle or knob of a door and which'is connism is released.
structed in'jsuch manner thatwhenthe knob of the door is tur'ned,'as it would beby a person who was trying the door with the intention of entering, the alarm is set off. i
' The object "of my invention is to provide a device of portable character. which may be: applied to door knobs in'general in such way as to produce an alarm when entrance is at tempted. j i i Iy invention comprises the novel parts and combinations thereof which will be specifically set forth in the claims. In'thev I I I by the actuation of the] door knob, through j the instrumentality of someone on the outaccompanying drawings'l have shown this clevicefin the type of construction 'which'is now most preferred by me. I Figure'l shows a side view as applied to a door.
Fig. 2 is a'similar viewshowinga slightly I different mann'erof supporting the alarm re straining device.
Fig. 3 is a front view of the same device. I
Figs. 4 and 5 are plan views of the restraining devices shown in modifications of structures.
Fig. 6 is a cross section showing more fully the construction of the device whereby the restraining mechanism is mounted upon the key.
My inventionis based upon the mounting of an alarm device upon the knob of the door and applying thereto a restraining member which is supported from the door independent of the knob, in such manner that when the knob is turned the alarm mechaat... device In the drawings 1 represents the door and 2 the alarm mechanism which is mounted upon the door knob. This alarm mechanism may be of any type found suitable. The type most generally used and which I now prefer to employ, 1s a spring actuated mechanism employing an escapement to vibrate a hammer and a bell'placed so that the hammer will contact therewith. As the op 1a Rsinelat-ahaRM.
I Specification of LettersPatent. s Patented 1917. "Serial No. 157,380.
crating parts of such mechanism is aw ll known type of structure, Ihavenot shown the same in any detail. lnfachthedetails I of construction of such a mechanism is immaterial. I bell portlon of such alm'echanism.
.A. oonronarion .011
In the drawings 20 represents the In ction with theescapement ofthe alarm mechanism, or some other body which vibrates in unison therewith,'I employ a bar I I edto beconnecteddire ctly with the escapement and to vibrate in connection therewith.
' This bar pro ects beyond'the casing'ofthcl' alarm mechanism. As herein shown anda s' or wire 21 which, as herein shown, is intend I preferto make it, this would extend downwardly therefrom.
For convenience in better securing there 1 straining :mechanism in connection there ith {-1 i-bdfimay be provided with"k'inks may be employed, this being intended to en I i or projections, 'as 22, of j which one or more gage the restraining member 41 to prevent the same dropping, excepting as it is released side.
The casing 2 is" provided with means whereby itmay be detachably secured upon a door knob; The means Ipreferred and herein shown, consists of three fingers 8, one adapted to' engage the top'v of the door knob and the other two to engagethesidfis thereof.v These may be of springchara'cter, or shaped to fit closely enough to the door knob that it may vibrate freely, the alarm bell will be rung. I provide a mechanism'which is adapted to be secured to, or supported,
from, the door independently of the door knob and having a member which may be engaged with the bar 21' to prevent its vibration. So long as so engaged the alarm will not ring.
One manner of doingthisiisto secure the restraining member upon a key which is placed in the key hole. The device, as
shown, in Figs. 1, 5 and 6, is mounted in this manner. This device comprises a base member 4, which is provided with means for securing it upon the key. The means shown for securing this in place consists of a finger 43, which engages the opposite side of the head of the key from that of the body 4, and
, a supplemental mechanism which engages .the shank of the key 5. The finger 43 may be of flexible metal, such that it may be bent up into the opening in the handle of the key, to better secure it in place.
As shown in Fig. 5, the member 4 is provided with flanges 52, depending at its sides and adapted to clasp the shank of the key. These maybe of spring materialpor of soft metal which may be pressed together so as to clamp on to the shank of the key.
Securedto the base member 4, by a pivot 42, is the latch 41 which is provided with a notch 46, in its outer end, which engages with the projecting portion of the vibrating bar, or wire 21. So long as the door knob remains stationary, the latch 41 will hold the vibrating wire 21 and thus prevent the bell from ringing. If, however, the door knob be turned, the wire 21 will lift the latch 41, or displace it in such mannerthat it willthen drop down into position, such as is shown by dotted lines .in Figs. 1 and 2. There will then be nothing to prevent the alarm from ringing its bell.
In Fig. 1 Ihaveshown a spring clasp or catch mounted upon the body of the member 4 and adapted to be spread to put it on the shank of a key and then clasped by the action of the spring.44, so as to engage the ends 4O thereofwith the shank of the'key.
In Figs. 2 and 4. I have shown the mem ber 4 as provided with a split end, 45, preferably having sufiicient resiliency or spring day of March, 1917.
2. An alarm device having arms adapted to embrace a door knob and a projecting arm controlling the actuation of the alarm, v
of a device provided with means for securing it independently of the knob and to engage said alarm controlling arm.
3. A device as described in claim 1 i which the restraining mechanism has two.
hinged parts one engaging the alarm device and adapted to drop on release of the alarm.
4. A device as described in claim 1 in which the restraining device has two parts hinged together, one part carrying the means for supporting engagement with a key and the other for restraining engagement with the alarm. I
5. A burglar alarm comprisinga spring actuated alarm bell mechanism, clamping fingers carried thereby and adapted forsupporting engagement with a door knob, said alarm mechanism having a projectingbar actuated by the bell actuating mechanism, and a restraining mechanismfforfsaid bar provided with means for supporting it inde endently of the door knob.
bigned at Seattle, Washington, this 20t JAMES M. CODY.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,
Washington, D. G. i r
US15738017A 1917-03-26 1917-03-26 Burglar-alarm. Expired - Lifetime US1251864A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9959718B2 (en) 2014-04-16 2018-05-01 William S. Hendrie Door alarm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9959718B2 (en) 2014-04-16 2018-05-01 William S. Hendrie Door alarm

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