Year: 1895

page_text: Date of Application, 18th Apr., 1895-Accepted, 18th May, 1895
COME LEIE DIECIFICATION.
Burglar Alarm.
I, ROBERT STANLEY HODGINS, of the Village of Lucan, in the County of
Middlesex, in the Province of Ontario, Canada, Commission Merchant, do
hereby declare the nature of this invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to a device to be attached to a door-jamb or window
frame, to make an alarm when the door or window is opened from without.
And it consists of the improved construction and combination of parts of the
same, as will be hereinafter first fully set forth and described, and then pointed out
in the claims.
Reference being had to the accompanying drawings, wherein
Fig. 1. is a perspective view of a device embodying my invention, set to give an
alarm.
Fig. 2. is another view of same, showing one side removed.
Fig. 3. is another view of Fig. 2. showing the position of the hammer when
exploding the cartridge.
Fig. 4. is a cross sectional view of a portion of the door and door-jamb, in this
view, the position and operation of the alarm is illustrated.
A, designates the body of the alarm, in which is formed the openings, B, C,
and the groove, D.
E, designates a screw threaded shank secured to or formed integral with the
body, A, by which said body may be rigidly secured to the door-jamb, window
frame or other suitable support, but any other suitable means may be used to
secure said body to any suitable support.
F, designates a pivot pin, the ends of which are supported in the body, A, at
opposite sides of, and near one end of the opening, C; and in the body, A, at the
opposite end of the opening, C, a recess, G, is formed, as shown in Figs. 2, and, 3.
H, designates a hammer, pivoted on the pivot pin, F, and formed with the
projection, I, and the recess, T, at the outer end, and with the flange, J, at the
inner end.
K, designates a spring, one end of which is inserted in the recess, G, and the
other end engages with the hammer, H, on or near the flange, J.
L, designates a cartridge, the overhanging end, N, of which is supplied with
fulminate or percussion powder.
This cartridge, L, is fitted to, and when inserted in the chamber or opening, B,
the overhanging end, N, rests on the body, A.
The operation is as follows, this device is adjusted and set, to give an alarm
as follows, the body, A, is secured to the door-jamb, R, and the hammer, H, is
adjusted, all as shown in Fig. 4. and the cartridge, L, is placed in the chamber, B,
as shown in Fig. 2.
By adjusting the hammer, H, to the position shown in Fig. 4. the end of the
spring, K, is adjusted and acts on said hammer above the pivot pin, F, and the
raising of the hammer to this position, increases the compression of the spring, K,
on said hammer, to securely hold the latter in the position shown in Figs. 1, and, 4,
and from accidental displacement.
When adjusted as described, the door, S, on being opened, moves in the direction
of the dotted line, x, and engages with the outer end of the hammer, H, to move
said outer end in the direction of the dotted line, b, all as shown in Fig. 4. until

page_text: the spring, K, acts on the hammer, H, or flange, J, of the latter below the pivot
pin, F; the hammer, H, is then acted upon by the spring, K, to lower the outer
end of said hammer, H, to the position shown in Fig. 3. and bring the projection, I,
sharply down on the overhanging end, N, of the cartridge, L, sufficient to explode
the latter with a loud report, and thereby give an alarm.
The flange, J, increases the effect or leverage of the spring, K, on the hammer, H,
while it is being lowered to give the alarm, and at the same time, prevents said
spring, K, from falling out of the opening, C.
As shown in the accompanying drawings, the hammer, H, is provided with a
recess, T, and the body, A, with an opposite groove or recess, D, but only one of
these parts may be provided with the recess for the purpose of preventing these
parts from being damaged, when the hammer falls to explode the cartridge.
This device may be applied to any support adjacent to any frame or barrier
closing an opening, to give an alarm when said frame or barrier is being opened
from without.
This device may be secured to a window for instance, to give an alarm when
attempting to open it from without, by securing the body, A, to the window frame,
and adjusting the hammer, H, so that it will be engaged with, and moved in the
direction of dotted line, b, by the movement of the sash.
By experiment I have found that the construction herein shown and described,
gives the best results, at the same time, I do not wish to confine myself to the
details thereof, as they may be modified in various ways without departing from
the spirit of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. A body, A, in which the openings, B, C, and recess, G, are formed, said
opening, B, being fitted to receive and hold a cartridge, and means for securing
said body to any suitable support, in combination with a hammer, H, formed with
the projection, I, and flange, J, and pivotally supported in the opening, C, and a
spring, K, substantially as and for the purpose set forth.
2nd. A body, A, provided with a screw threaded shank, E, and in which body,
the openings, B, C, and recess, G, are formed, said opening, B, being fitted to
receive and hold a cartridge, in combination with a hammer, H, formed with the
projection, I, and flange, J, and pivotally supported in the opening, C, and a
spring, K, substantially as and for the purpose set forth.
3rd. A body, A, provided with a screw threaded shank, E, and in which body,
the openings, B, C, groove, D, and recess, G, are formed, said opening, B, being
fitted to receive and hold a cartridge, in combination with a hammer, H, formed
with the projection, I, recess, T, and flange, J, and pivotally supported in the
opening, C, and a spring, K, substantially as and for the purpose set forth.
4th. A body, A, in which the openings, B, C, groove, D, and recess, G, are
formed, said opening, B, being fitted to receive and hold a cartridge, and
means for securing said body to any suitable support in combination with a
hammer, H, formed with the projection, I, and Hange, J, and pivotally
supported in the opening, C, and a spring, K, substantially as and for the
purpose set forth.
5th. A body, A, provided with a screw threaded shank, E, and in which body,
the openings, B, C, groove, D, and recess, G, are formed, said opening, B,
being fitted. to receive and hold a cartridge, in combination with a hammer, H,
formed with the projection, I, and flange, J, and pivotally supported in the
opening, C, and a spring, K, substantially as and for the purpose set forth.
Dated this 26th day of Tan 1905
ROBERT STANLEY HODGINS.