Improvement in Controlling Switches for Dynamo Electric Machines.
Year: 1896

page_text: Date of Application, 6th Feb., 1896-Accepted, 7th Mar., 1896
COMPLETE SPECIFICATION.
Improvement in Controlling Switches for Dynamo Electric
Machines.
FREDERICK HENRY ROYCE of Eastbourne Holland Road, Chorlton-cum-
Hardy Electrician and ERNEST ALEXANDER CLAREMONT of Electron,
Cavendish Road Chorlton-cum-Hardy Electrician, 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 :-
The improvement which forms the subject of this invention is a switch for use in
connection with dynamo electric motors, being a combined many way switch and
resistance controlling switch whereby the lends from the generator offering various
voltages can be connected to the motor by which means the speed of the motor can
be increased or decreased as required the switches being fitted with an interlocking
device the liquid or metallic resistance switch being primary and so arranged that.
when the full load is on the voltage of the motor circuit cannot be altered by
moving over the many pole switch without first increasing the resistance by moving
over the resistance switch on which the motion of the many way switch depends,.
thus preventing excessive rushes of current and excessive sparking of the many way
switch.
In order to more clearly describe the nature of this our said invention we attach
hereunto a sheet of drawings on which similar letters in the different views refer to
similar parts.
On reference to Fig. 1 it will be seen that the drawing represents a three way
switch secured to one side of a metal or other suitable tank or cistern a containing
a liquid or metallic resistance into which suitable contact plates are lowered or
raised by means of the pivotted disc b forming the resistance controlling switch.
which is secured to the opposite side of the tank or cistern a and which rotates.
upon the shaft c.
The interlocking shaft d is fitted with a helical spring which causes the end of
the shaft to shoot into the hole e in the disc b when the disc is rotated on its axis
and the hole is concentric with the shaft thus releasing the lever f of the three way.
switch to which are secured the brushes 9 and g' which can be rotated upon the
spindle to any pair of the contacts h each of which are connected to two-
conductors of different potential of the three wire supply system the motor
conductors being connected to the contacts; and j.
The handle of the disc b is fitted with a hand lever having two arms and m
pivotted at n the end of the arm m being fitted with a pin and releasing spring, on
compressing the arm of the hand lever, the arm m and pin together with the
interlocking shaft d move inward the other end of the shaft entering one of the
boles e depending on the required position of the three way switch lever f which
is instantly secured at the same time releasing the resistance switch disc b..
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-
A combined many way switch and resistance controlling switch fitted with an.

page_text: interlocking device making the motion of the many way switch entirely dependent
on that of the resistance controlling switch.
Dated this 5th day of February 1896.
E. A. CLAREMONT.
F. H. ROYCE.