Improvements in Electric Bells.
Year: 1892

page_text: Date of Application, 26th Feb., 1892
Complete Specification Left, 28th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Bells.
We, LESLIE WATT WINNALL, of Glenmore, Dollis Road, Church End,
Finchley, and WILLIAM HOWARD WINNALL of Nicoll Road, Harlesden, both in
County of Middlesex, Electricians, do hereby declare the nature of this invention
to be as follows:-
This invention relates to electric bells of the kind described in the Specification
of former Letters Patent dated July 4th, 1888, No. 9747.
According to our present invention the motion of the armature is communicated
to the hammer or clapper through the medium of a rack and pinion, the rack which
is preferably of segmental shape being secured to the armature whilst the pinion is
secured to the clapper in axial alignment with the axis upon which the clapper
oscillates.
Our present improvements are applicable for single or double stroke bells.
30
1
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electric Bells.
We, LESLIE WATT WINNALL, of Glenmore, Dollis Road, Church End,
Finchley, and WILLIAM HOWARD WINNALL, of Nicoll Road, Harlesden, both in
the County of Middlesex, Electricians, 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 :-
This invention relates to electric bells of the kind described in the Specification
of former Letters Patent dated July 4th 1888 No. 9747.
According to our present invention the motion of the armature is communicated
to the hammer or clapper through the medium of a rack and pinion, the rack which
is preferably of segmental shape being secured to the armature whilst the pinion is
secured to the clapper in axial alignment with the axis upon the which the clapper
oscillates.
Our present improvements are applicable for single or double stroke bells.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which :-
Figures 1 and 2 are front and side elevations respectively of. a single stroke
electric bell having our improvements applied thereto; and,
Figures 3 and 4 are similar views of striking mechanism adapted for giving
double strokes, that is to say, for striking both sides of a bell.
Similar letters of reference indicate corresponding parts in the several figures.
a is the framing carrying the mechanism, is the electro-magnet, and c is the
armature pivotted at d. e is the hammer or clapper which is connected to a boss f
carried upon a stud g.
is our segmental rack secured to the armature c, and i is a pinion secured to the
boss and engaging with the teeth of the rack h. With this construction it will be
readily understood that when the electro-magnet b is energized by the passage of a
current of electricity therethrough the armature c will be attracted and through the
medium of the segmental rack attached thereto impart motion to the pinion i and

page_text: thus to the boss of whereby the hammer carried thereby will be caused to strike
the bell.
In the bell shewn in Figures 1 and 2 aspring is employed to maintain the
armature in close proximity to the poles of the magnet. It is obvious that in
using the said bell any means may be employed for alternately making and breaking
the electric circuit.
In the double stroke mechanism, however, shewn in Figures 3 and 4 it is
necessary to provide that the movements of the hammer or clapper shall effect the
making and breaking of the circuit in the manner described in the Specification of
the Patent before referred to, and for this purpose we employ upon the stud ga
collar having two arms k, k similar to those described in the said former
Specification, the said arms being alternately acted upon by a pin in the boss /
and upon which the hammer e is directly suspended. This collar is in the circuit
of the bell, the current being conveyed thereto through a spring-arm m pivotted
at n to an insulated bracket n' and normally in electrical contact with the said
collar. In the surface of the said collar is introduced an insulating strip o in such
a position that when the armature is attracted and the boss moved causing the
hammer to swing in the direction of the arrow 1 Figure 3 the pin by striking the
artn will move the collar sufficiently to bring the said insulating strip into
contact with the arm m, whereby the circuit will be broken and the hammer will
then return by gravity to its vertical position and be carried by the momentum in
the direction of the arrow 2 so far that the pin 7 will strike the arm and rotate
the collar in the reverse direction. In order, however, that during the movement
of the hammer in the direction of the arrow 2, Figure 3, the electro-magnet shall
not be energized to retard the movement of the hammer under the influence of the
momentum, we fix upon the said collar a lifting piece p which is composed of
insulating material. This piece p during the movement in the direction of the
arrow 2 strikes against the underside of the arm m and lifts the same out of contact
with the collar until the hammer has moved partly back in the direction of the
arrow 1.
. Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In an electric bell imparting the movement of the armature to the hammer or
clapper through the medium of a rack and pinion, substantially as described.
2. In an electric bell the hammer or clapper of which is operated by an armature
through the medium of a rack and pinion, the arrangement of the lifting piece,
such as p for causing the interruption of the electric circuit during the time that
the hammer is moving under the influence of momentum, substantially as, and for
the purpose, described..
3. The improvements in electric bells hereinbefore described and illustrated in
the accompanying drawings.
:
Dated the 28th day of November 1800
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.