Improvements in or connected with Signalling or Alarum Apparatus.
Year: 1897

page_text: Date of Application, 11th Feb., 1897-Accepted, 26th June, 1897
COMPLETE SPECIFICATION.
Improvements in or connected with Signalling or Alarum
Apparatus.
1, CHRISTIAN MEISSLER of 10 Logenstrasse, Kaiserslautern, in the Empire of
Germany, Mechanic, 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 :-
My invention refers to the construction and arrangement of an automatically
acting apparatus or appliance or machine for ringing a bell when doors of apart-
ments or houses are attempted to be opened and to prevent the violent opening of
doors. For this purpose the apparatus is placed inside the room, in front of the
door on the floor.
In order that my invention may be fully understood I will proceed to describe
same by reference to the accompanying drawings:-
:-
Fig. 1 is a view in side elevation, of an appliance constructed according to my
invention.
Fig. 2 is a view in plan of the apparatus complete.
Fig. 3 is a view of the bell mechanism detached.
Fig. 4 is an inverted plan view of the clock mechanism, the spring barrel and the
rod G, hereafter referred to, being for the sake of clearness removed.
As shewn by the drawings, the apparatus is composed of two shoes A. A, on
which the alarm mechanism is arranged, the disengaging lever of which is also
placed between the two shoes.
These shoes are connected together by a plate or plates.
The front of the shoes A A. have teeth a a and at the rear have points b b which
prevent the recoil of the apparatus by any unauthorized person opening the door
even with the greatest violence because these points bb strongly grip (deeply) into
the floor. The points a a also have rearwardly projecting teeth a¹ a¹ to further
prevent recoil. In case of the door being violently pushed, and rising on the
parts A, the two hooks or points d d grip into the door itself so that it is absolutely
impossible to open it. Between the two shoes A A the unlocking lever F is
arranged for the alarum mechanism which lever projecting somewhat from the
plane of the shoes A A slightly yields when the bottom of the door comes into
contact with it. This unlocking lever F is held up at by a screw, and the back
end of the lever pushes on a spring rod G, extending into the box containing the
clock mechanism, so that when the unlocking lever F yields, under the impulsion
of its action, the rod G unlocks the escapement E Figs. 3 and 4 in such manner
that the clock movement being free the alarum rings.
The alarum mechanism is of ordinary construction and is arranged on the
apparatus in a box C.
Figs. 3 and 4 shew at B the plate of the clock box; at D the box of the spring,
and at E the clock escapement.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A movable alarum apparatus for the securing of doors having shoes cuniform
at one of their ends and terminating in points at the other ends provided with lower

page_text: points to prevent the recoil on the floor and surmounted with hooks intended to grip
into the door if it rises when opening, and the said shoes being held together by a
plate, substantially as described.
2. The unlocking tongue which projects slightly above the plane of the shoes
and which being lowered by the base of the door brings the alarum apparatus
(fixed on the plate) in connection with the shoes into action, substantially as
.described.
3. The alarum or signalling apparatus composed of two shoes with bevils thereon
in combination with a lever, the latter being operated by a door when opened for
the purpose of causing a bell or alarum to ring arranged between the said shoes,
substantially as described and illustrated with reference to the accompanying
..drawings.
BREWER & SON,
London and Leeds, Agents for the Applicant.