Improvements in or connected with Circuit Closers for Electric Bells..
Year: 1896

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Circuit Closers for
Electric Bells..
'
I, JAMES NEWTON of 66, Liverpool Road, Islington, London, N. Bellhanger
and Gasfitter, 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 relates to improvements in electric bell lever pulls, circuit closers,
and pull boxes and it has for objects to simplify the construction of the circuit
closer and of the casing in which the parts are contained; to obtain increased range
of motion of the contact-carrying lever; and to otherwise improve the construction
and operation of the device.
The invention will be described with reference to the accompanying drawings
forming part of this specification wherein Figure 1 is a face view of my improved
appliance, the pull box being shewn in section, and Figure 2 is a plan view of the
same.
The lever A carries the metallic contact stud B and is pivoted at a within a
circular case C the lever passing out through a circumferential slot c in the part of
the side of the case about opposite that at which the pivotal centre a is situate.
By the oscillation of A about its pivot the contact B closes the circuit between
two spring contacts D D which are curved concentrically with the arc described
by the contact B so that the latter when moved between them will make rubbing
contact with both and they are attached to an insulated block d fixed to the bottom
of the case C to which the members of the circuit are respectively connected.
The contacts D diverge as at d' sufficiently to admit the contact B between them
without touching either, when the lever A is in its normal position, the said
contacts for the remainder of their length being separated by a shorter distance
such that the contact B when moved between them will make contact with both and
so complete the circuit. The lever A is acted on by a spring E mounted on a
stud e and bearing by one limb against the lever A and by the other against the
side of the case as an abutment whereby it is normally held in such position that
the contact B is situated between the divergent portions of the spring contacts D
without touching either. The end of the lever arm A is provided with a knob
handle or with a jointed link F or swivel for the attachment of the cord if one be
used, so as to avoid the cutting of the cord by rubbing in the eye of the lever arm
as when attached directly thereto. The rosette C¹ forming the ornamental cover
of the case C is screwed within the sides of the casing.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The herein described improved electric bell lever pull consisting essentially in
the combination, with a pair of parallel spring contacts and of an interposed circuit-
closing contact carried by a spring-retracted lever and adapted to make rubbing
contact with both spring contacts substantially as specified.
Dated this 4th day of December 1896.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.