Improvements in and relating to Signal Bells.
Year: 1897

page_text: Date of Application, 9th Sept., 1897-Accepted, 30th Oct., 1897
COMPLETE SPECIFICATION.
Improvements in and relating to Signal Bells.
I, JUSTUS WINDMULLER of the Firm of Windmuller & Co., Commandit-
Gesellschaft of 82 and 84 Hansaring Cologne, in the Empire of Germany, Manu-
facturer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be prticularly described and ascertained in and by
the following statement:-
This invention relates to a new signal bell which arranged on doors etc. can
be used instead of the hitherto used draw or electric bells. It has in consequence
of the arrangement of its mechanism the advantage that the signal sounds for a
longer time than that given by a draw-bell and is similar to the signal of an electric
bell, and also in consequence of its construction, it is much less liable to refuse
to work than draw bells or electric bells.
In the annexed drawing Fig. 1 is a plan-view and Fig. 2 is a side-view of the
signal bell. Fig. 3 is a section showing the arrangement of such a bell on a door.
The improved signal bell consists principally of a block a on which there is
arranged a double bracket b which carries wheel-work, and the bell G.
The wheel-work consists of the driving-shaft c which carries on the outside of
the bracket a driving lever H, and on the inside a loose toothed-wheel R
provided with a pawl which engages with a fixed ratchet-wheel S also carried
by the shaft c. A spiral spring F is provided with one end attached to the
shaft c and the other end to the bolt i. The toothed-wheel R engages with a small
toothed-wheel m fixed on a shaft and the wheel n seated on the same shaft
transfers the movement again by means of a small toothed-wheel o to the shaft e.
On the latter there is seated a wheel p with pointed teeth, into which the ratchet
fixed on the shaft f engages in such a manner that by the passage of each single
tooth the hammer M also seated on the shaft f is successively lifted and let fall
on to the bell G.
For limiting the movement of the shaft c carries on the outside a limiting lever h,
which strikes on the pint on the outside of the bracket and in this manner allows
the lever H to be pushed back only for a determined distance as described herein-
after. In order to be able to prevent when required the bell from being rung
a stop is provided consisting of a lever N which is turnable round the bell pin
and which when turned under the hammer M prevents it from striking on the
bell.
A method of arrangement of this bell on a door is shown in Fig. 3 in which a
is the bell block, H is the above-mentioned driving lever and T is the door.
To the lever H there is attached in a slot a rod D, which reaches through the
block a and the door T and on which a button K is arranged in a displaceable
manner. When this button is pressed inwards, the lever H is naturally turned
back and the spring F is tightened and on removing the pressure from the button K
the consequent reaction of the spring F causes a revolution of the shaft c which
movement by means of the toothed-wheel mechanism causes the revolution of the

page_text: toothed-wheel p, the teeth of which acting on the ratchet u seated on the shaft f,
cause the hammer M, also seated on the shaft f to rise and fall on to the bell.
The arrangement of the bell on the door may be varied in any manner.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. An improved signal bell characterized by a shaft seated on a block a in
a double bracket b on which shaft a loose toothed wheel R with a pawl k, a fixed
ratchet-wheel S and a spring F are seated as well as a driving lever H, which when
pressed back actuates the spring F fixed with one end on the shaft c and with the
other end in a bolt i, as far as a projection h, t, allows, whilst on removing the
pressure from the lever H the spring F effects a revolution of the shaft c, which
by means of a toothed wheel gearing m, d, n, o, e, brings a wheel P into rotation,
the teeth of which cause, by means of a ratchet u, seated on a shaft f, a hammer M
to rise and to fall on the bell G.
2. In a signal bell as in Claim 1, a stopping device, consisting of a lever N
turnable round the bell-pin and reaching under the hammer M, for the purpose
of preventing temporarily the hammer from striking on the bell.
Dated this 9th day of Santambor 1807
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to the Applicant.