Improvements in Burglar Alarms.
Year: 1891

page_text: Date of Application, 20th May, 1891-Accepted, 11th July, 1891
COMPLETE SPECIFICATION.
Improvements in Burglar Alarms.
I, JAQUES LEO SCHEY, of Reuschestrasse, 57, Breslau, Germany, Mechanical
Engineer, 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:--
Notwithstanding strict preventive measures on the part of the authorities and
the public there is always much housebreaking committed in dwelling houses; and
although it would appear to be impossible to devise an appliance for remedying
this evil, the invention hereinafter described completely fulfils all requirements,
and is illustrated in the accompanying drawings, wherein
Figure 1 is a view shewing a door provided with an appliance for the prevention
of burglary according to my invention.
Figure 2 shews my invention adapted to prevent the robbery of overcoats and
othor garments and articles.
Figures 3 and 4 are enlarged views of the appliance shewn in Figure 1.
Figures 5, 6 and 7 are enlarged views of the appliance shewn in Figure 2.
The appliance illustrated in Figures 1. 3 and 4 consists mainly of a tube in two
sections a and b respectively, attached to a base plate d. The tube a is provided
with a piston e and piston rod c, and is closed at one end by the cover The
piston rod c is provided at its outer end with a ball head in which a pin h is set.
Between the cover fand the piston e there is coiled upon the piston rod a spiral
spring 9.
In the tube there is a plug i, fixed by means of a screw bolt, which
serves as the striking block for catching the blow of the spring actuated piston e,
and also serves as the pan for receiving a detonator.
The above described apparatus is affixed to the door to be protected in the
ordinary manner of the usual door chain attachment, by wood-screws, and the
chain is attached at one end to the door frame by means of the usual staple.
If the appliance is now to be loaded and adjusted ready for service, the piston e
is drawn back against its spring and the pin in the head of the piston rod raised
until the round end thereof. rests against the end of the metal plate d, and one or
more detonators are placed in the pan of the tube according to the loudness of
the alarm required. The chain is now hooked, with its free end, into the hole!
provided in the flattened end of the. pin h.
Should a burglar have succeeded in forcing the usual door lock or other
provision, and attempt an entrance, the chain k pulls at the pin h which is turned
until its end t loses its hold on the metal plate d, whereupon the piston e is shot
into the tube by the spring and the detonator exploded upon the black i. The
mtruder, alarmed at this explosion, fancying that he has been fired at from within
doors, takes forthwith to his heels.
g
This invention is also of value to the shop-keeper, as he can apply it to the
door of his shop, show case or other place where his merchandise is exposed, thus
obviating the necessity of a watch being kept, as the report would at once attract
the attention of the public.
The appliance shewn in Figures 2, 5, 6 and 7, though somewhat different in
shape consists in the main of the same parts as the one above described; its object
however is to lessen the frequency of robberies of overcoats, and it is attached
near the collar of the garment.
In a tube u which rests upon a small metal base plate, there is arranged a
moveable piston m provided with a piston rod on whose end is fixed a ball-head o
for the purpose of being taken hold of when setting the appliance, a spiral spring
being provided and arranged as in the first described appliance. One end of the

page_text: tube u is provided with a cover p which screws therein and which serves as a pan
to receive a detonator and to receive the blow of the spring actuated piston m.
The tube u also possesses two side apertures arranged opposite one another, so that
by placing the pins through such apertures the previously set spring piston is
retained in its "cocked" position. For the purpose of sewing the appliance to the
coat or other article small lugs are provided. The apparatus is set by drawing
back the piston m and placing the pins through the apertures in the tube u.
having unscrewed the cover p the detonator is placed inside the tube and the
cover screwed on again; the apparatus is then ready for use. Attached to the
pinthere is a small chain or cord, which is wound once or twice round the clothes
peg when hanging up the coat.
After
If unauthorized persons attempt to take down the coat the chain or cord wound
round the peg pulls the pin s from the tube , thus releasing the piston m and
exploding a detonator. The attention of the guests is at once attracted by such a
detonation, the ringing of bells and sounding of whistles being common occurrences
in public places.
The present invention is in every respect free from danger. Each appliance is
self contained and is therefore undisturbed by outside influences.
The detonators used may be the common fulminating wafers or caps, the confined
space of the room in which they are used rendering the detonation sufficiently
loud.
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:
First. A contrivance for the prevention of housebreaking, consisting mainly of
a tube such as a to be attached to the door to be protected, in which by means of
a spring such as ga piston such as e is actuated so as to deliver a blow upon a
striking surface such as on which a detonator has been placed, and of a chain
such as fixed to the door frame and which causes the release of the spring piston e;
substantially as and for the purposes herein set forth.
Second. A contrivance for the prevention of theft by attaching same to the
object to be protected, such as described, wherein the cover of the appliance can
be screwed on and off for the purpose of placing a detonator inside, and wherein
a chain or cord attached to a pin s serves to release the detonating spring actuated
piston m substantially as and for the purposes herein set forth.
Dated this 19th day of May 1891.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicant's Patent Agents.