Burglar-Alarm. Page: 3 of 4
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UNITED STATES PATENT OFFICE
JOSEPH S. ALDERiAIN, OF ENNIS, TEXAS.
BURGLAR-ALARM.Specification of Letters Patent.
Patented Oct. 30, 1917.
Application filed 1rarch 8, 1916. Serial No. 82,875.
To all whom it may concern:
'Be it known that I, JOSEPH S. ALDERMAN,
a citizen of the United States, residing at
Ennis, in the county of Ellis and State of
5 Texas, have invented certain new and use-
ful Improvements in Burglar-Alarms; and
I do hereby declare the following to be a
full, clear, and exact description of the in-
vention, such as will enable others skilled in
10 the art to which it appertains to make. and
use the same.
This invention relates to burglar alarms,
and has for its primary object to provide a
simple and eficient device of this character
15 adapted to be automatically released by the
opening movement of a window or door to
sound an alarm and thus give warning.
With this and other objects in view, the
invention consists in the novel construction,
20 combination and arrangement of parts as
will be hereinafter specifically described,
claimed and illustrated in the accompany-
ing drawings, in which:
Figure 1 represents a front elevation of
25 a door, illustrating the improved burglar
alarm applied to use thereon,
Fig. 2 represents a longitudinal sectional
view on the line 2-2 of Fig. 1,
Fig. 3 represents a horizontal sectional
30 view on the line 3-3 of Fig. 1,
Fig. 4 represents a front elevation of the
burglar alarm applied to a window,
Fig. 5 represents a vertical sectional view
on the line 5-5 of Fig. 4, and
35 Fig. 6 is a perspective view of the firing
member.
Referring to the drawing in detail, where-
in similar reference numerals designate cor-
responding parts throughout the several
40 views, the numeral 8 indicates an elongated
body member having a relatively wide lon-
gitudinal slot 9 adjacent one end thereof
connected with a transverse opening 10
formed adjacent the opposite end by a cen-
45 trally located connecting bore 11. Adjacent
the opposite ends the body or base 8 is
formed with apertures 12 disposed in par-
allel relation to the opening 10 and adapted
to receive screws, or equivalent means,
5o whereby the base is secured in position to a
door or window frame. A cartridge holder
13 is secured in the bore 11 in the end adja-
cent the slot 9.
A firing element 14 is slidably mounted
55 in the relatively wide slot 9 and is provided
with a transverse guide pin 15 slidably re-ceived within slots 16 formed in the side
walls of the slot 9 and disposed at right
angles to the latter. The firing member 14
is provided with reduced lateral extensions 60
17 projecting outwardly of the base S and
having apertures 18 therein receiving the
upper extremities of operating springs 19,
the lower ends of which are mounted in
apertured ears 20 formed adjacent the lower 65
end of the base 8. A U-shaped strap 21 is
connected with the upper portion of the slid-
able firing member' 14 and receives one 'end
of a lever 22, having a longitudinal slot 22a
pivotally receiving a pin 23 fastened to a win- 70
dow, door or other suitable supporting frame
and adapted to co-act with devices carried
by the door or window to retain the firing
member 14 in elevated or inoperative posi-
tion, while the door or window is in closed 75
position. When the alarm is not in use, the
lever 22 drops by gravity into the vertical
position illustrated in dotted lines in Fig. 1
and is thus rendered inoperative.
In applying the burglar alarm to use in 80
connection with a swinging door, the base 8
is .secured in position upon the door frame
24 by screws fitted in the apertures 12 and
secured in the door frame. The lever 22 is
pivotally secured to the door frame 24 by 85
the screw, or equivalent means, 23 at a. point
adjacent the upper extremity of the slot 9
in the base, the outer end of the lever being
extended through the slot 9 and the strap.
21 carried by the ring element 14. A plate 90
25 is rigidly secured adjacent the vertical
swinging edge of the door 26 and the outer
end 27 thereof is twisted and so arranged
that when the door is closed the twisted end
27 is disposed above the adjacent end of the 95
lever 22 and operates to retain the firing
element in elevated or inoperative position
against the tension of the operating springs
19. When the door is opened, the twisted
end 27 of the plate is moved off of the adja- 100
cent end of the lever 22, thus releasing the
latter and permitting the' firing element 14
to move downwardly in the base 8 under the
influence of the springs 19, thus forcibly en-
gaging the firing pin 28 carried by the mem- 105
ber 14 into engagement with the blank car-
tridge 29, exploding the latter and giving an
alarm.
In applying the alarm to a window, the
base 8 is attached to the window frame 30 110
and the lever 22 is controlled by angular
plates.31 fastened to the lower sash 32.1244,938.
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Alderman, Joseph S. Burglar-Alarm., patent, October 30, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth854140/m1/3/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.