Year: 1886

page_text: Date of Application, 22nd Apr., 1886.
Complete Left, 19th Jan., 1887.
Complete Accepted, 22nd Feb., 1887..
We, WILLIAM HENRY PREECE of Gothic Lodge Wimbledon in the County of
Surrey, Electrician and JOSEPH WILLIAM WILLMOT of 43 Medora Road Brixton in
the County of Surrey, Telegraphic Engineer do hereby declare the nature of this
invention to be as follows:-
This invention relates to a construction of electric switch or apparatus for opening
and closing an electric circuit in such a manner that the action is rapid and certain, as
we will explain referring to the accompanying drawings.
Fig. is a plan (with the cover and knob or handle removed) and Fig. 2 is a
vertical section of a switch according to our invention. a is a button or knob of
ebonite or other suitable material fixed to an axle which passes through the base a c
of insulating material and is held by a screw and washer t. A metal arm p projects
from the axle and turns with it between two stop-pins p². A spring s having its
one end fixed to the axle and its other end to the pin draws the arm p firmly
against the stop p². Two curved blade springs d and, which are preferably of
German silver, are secured to the base by screws and screws to which the
leading wires are connected. The ends of the springs de overlap each other and are.
bent so as to embrace the end of the arm p when it is turned to the position shewn.
These bent ends tend to approach each other but not to touch, so that, when the arm p
is engaged between them, it is held with sufficient force to resist the tension of the
springs tending to draw the arm back against the stop p², but it can be forcibly
moved from the grip of the springs de by turning the knob a.
While the arm p
remains engaged between d and e it makes contact closing the circuit with which they
are connected. When it is desired to open the circuit the knob a is turned sufficiently
to release.p from the grip of the springs de, and thereupon the spring & causes the
arm p to make a sudden movement to p², the disengagement from de being so rapid
that there is no sparking at the breaking of contact. A cap k k screwed to the base ce
protects the apparatus from dusi.
ADE
28, Southampton Buildings, London, W.C.,
Agents for the Applicants.

page_text: We, WILLIAM HENRY PREECE, of Gothic Lodge, Wimbledon in the County of
Surrey, Electrician, and JOSEPH WILLIAM WILLMOT, of 43 Medora Road, Brixton in
the County of Surrey, Telegraphic Engineer, 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 a construction of electric switch or apparatus for opening
and closing an electric circuit in such a manner that the action is rapid and certain,
as we will explain referring to the accompanying drawings.
Fig. 1 is a plan (with the cover and knob or handle removed) and Fig. 2 is a
vertical section of a switch according to our invention. a is a button or knob of
ebonite or other suitable material fixed to an axle which passes through the base cc of
insulating material and is held by a screw and washer t. A metal arm projects
from the axle band turns with it between two stop-pins pp². A springs having its
one end fixed to the axle and its other end to the pin p draws the arm firmly
against the stop². Two curved blade springs d and e are secured to the base e
by
screws g, h, i, to which the leading wires are connected. The ends of the springs
de are bent so as each partly to embrace an arm of when it is turned to the position
shewn. When the arms of are engaged with the bent ends of d and e, they are held
with sufficient force to resist the tension of the springs tending to draw the arm back
against the stop p, but the arms can be forcibly moved from the grip of the springs de
by turning the knob a. While the arm remains engaged with the springs d
and it makes contact closing the circuit with which they are connected. When it is
desired to open the circuit, the knob a is turned sufficiently to release from the grip
of the springs de, and thereupon the springs causes the arm to make a sudden
to movement, the disengagement from de being so rapid that there is little or no
sparking at the breaking of contact. The arms of p may he squared at their ends to
engage with the bends of the springs de, as indicated at Fig. 3. A cap k k screwed
to the base e protects the apparatus from dusi.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
The construction and use of an electric switch arranged and operating substantially
as herein described with reference to the accompanying drawings.
ABEL & IMRAY,
Agents for the Applicants.