An Improved Alarm Apparatus, especially applicable to Prevent the Unauthorized Removal of Vehicles.
Year: 1892

page_text: Date of Application, 26th Feb., 1892-Accepted, 30th Apr., 1892
CUMI DLM ST MOT
An Improved Alarm Apparatus, especially applicable to Prevent the
Unauthorized Removal of Vehicles.
1, EMIL LACHMANN of 9 Bischofstrasse, Berlin, in the Kingdom of Prussia
and German Empire, 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 :-
The object of this invention is an alarm apparatus and consists in a clapper or
bell frame which is controlled by a knob.
This apparatus is applicable to all kinds of purposes, for instance, to prevent
the unauthorized removal of vehicles, to advise of the unauthorized opening of
doors, etc.
In order that my invention may be the better understood now proceed to
describe the same as used for vehicles, reference being had to the accompanying
Like letters refer to like
drawings and to the letters and figures marked thereon.
parts throughout the figures.
Figure is a sectional view of the apparatus with the clappers placed out of
action.
Figure 2 is a side view of the apparatus with the clappers placed ready for
action and
Figure 3 is a detail view of the clapper carrying ring.
On a very elastic flat steel spring a the thicker end of which is screwed to the
vehicle, is situated a disc on which is arranged another very elastic spring c
wound spirally in the form of a cone. One end d of the spring e extends vertically
upwards and carries a double gonged bell e el, the two halves of which are slightly
apart and of different sound, tone or key. On the piece d protruding upwards
through the bell e el is placed a spiral spring f which retains a ring in the
position shown in Figure 1, so that the clappers suspended from the ring g
preferably by pieces of gut, cannot when swinging to and fro touch the belle e
when the apparatus is placed in its inactive position as shown in Figure 1. By
pressing the knob downwards it being arranged to slide on the end d, the ring g
is brought into the position shown in Figure 2, so that the clappers when springing
strike against the double gonged belle el.
A spring lock maintains the knob in the lower position, the catch or bolt of
In order to make
the lock springing automatically into the recess of the knob i.
the apparatus inactive the lock k must be unlocked, by means of a key, when the
spring will lift the clapper ring away from the belle e as in Figure 1.
m
To prevent the wilful destruction of the apparatus, it is surrounded by a casing
of wire work or other suitable material, the upper part of which is provided with
a cover n to protect the apparatus against the weather, the lower part being fixed.
to the disc b.
The action of the apparatus is as follows:-
During the authorized use of the vehicle, the bell is not sounded, because the
spiral spring maintains the ring with the clappers in the upper position, see
Figure 1, so that the clappers can swing freely without striking against the
bell e e'.
When the driver leaves the vehicle he has only to press the knob i downwards.
until the catch or bolt of the spring lock springs into the recess of the knob i.
The apparatus is now ready for action and the driver may confidently leave the
vehicle without fear of the unauthorized removal of the same, because owing to
the great elasticity of the double spring arrangement of the apparatus, the slightest
movement of the vehicle even on a very smooth road will give a loud sounding

page_text: alarm produced by the numerous clappers and the double sounding bell. This
alarm can only be prevented by the unlocking of the lock, which is preferably an
umpickable patent fock, the key of which is carried by the driver.
When the latter intends to use the vehicle again, he disengages the apparatus by
unlocking the lock.
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. An alarm apparatus consisting of a movable frame carrying the clappers,
and adapted to be retained in the striking position by a lock; and a bell, the whole
being mounted upon an easily vibrated support.
2nd. The arrangement and construction of an alarm apparatus, substantially as
described and illustrated in the accompanying drawings.
Dated this 26th day of February 1892.
FELL & WILDING,
Agents for the Applicant.