An Improved Controlling and Reversing Switch for Electro Motors and similar uses.
Year: 1896

page_text: Date of Application, 11th Sept., 1896-Accepted, 31st Oct., 1896
COMPLETE SPECIFICATION.
An Improved Controlling and Reversing Switch for Electro Motors
and similar uses.
1
"
.
We, FREDERICK HENRY ROYCE, and ERNEST ALEXANDER CLAREMONT,
both of Cooke Street, Hulme, Manchester, in the County of Lancaster,
Manufacturing 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 switches for controlling the electrical current supplied
to electro motors and other uses. The objects of this invention are to obtain a quick
make and quick break switch for general use, and a main switch, either single or
reversing for starting, stopping or reversing electro motors and like uses, and means
for actuating the resistance switch ordinarily employed to start electro motors.
We attain these objects by the means hereinafter described, and as shown in the
accompanying sheet of drawings in which
Fig. 1 represents a longitudinal section and Fig. 2 a plan of an automatic
regulating switch constructed according to our invention for controlling motors that
are required to run in either direction.
Fig. 3 is a plan of a modification of our invention showing a single way simple
switch.
In these views similar letters refer to similar parts.
In Figs. 1 and 2 shown in these drawings the several parts are shown in the
relative positions they would assume when if employed in combination with
méchanism such as a hoist said mechanism is at rest.
a is a longitudinal sliding bar which is supported on bearings a¹ and a² that are
affixed to the board 6 and retained in position on the aforesaid bearings by the
rollers a³ and a which permit said bar to have longitudinal movement.
c and c¹ are brackets affixed to the underside of the board 6 for supporting the
spring guides c2 and which are pivotted thereto at the T shaped levers d
and dare pivotted on the spindles d and have the tail pieces d and d
connected to the free ends of the aforesaid spring guides 2 and 3: A roller e which
is connected to the slide bar a by links f rests on the lower ends of the inclined
surfaces of the levers d and d' the compression spring ġ acting on the links f
keeping said roller pressed on the surfaces of the levers d and d. The laminated
switch levers h. h₁h² 13 are secured to the spindles d; jj are contacts for
switches.
q is a bell crank resistance switch lever that is supported by the bracket q
The end 9 is connected to the tension spring which may be adjusted by the
screw; a roller s is attached to the free end g of the aforesaid lever q and runs
on the inclined surfaces a* extending from one side of the bar a and by which the
lever g of the many way switch is actuated: the lever q is connected to the
plunger t¹ of the dash pot t by the rod t'. On the shaft u a catch u¹ is placed for
holding up the lever q until one of the main switches has completed circuit, and
also the levers u and us which are actuated by the levers u and us when any of the
main switches are in contact.
If the hereinbefore described switch is connected so as to control a hoist the
controlling rope is attached to levers that are arranged to give motion to the
bar a.
In the position shown on the drawing the hoist would be stationary. In order to
put the hoist in motion in either an upward or downward direction the bar a would
be caused to slide by the action of the controlling rope and the roller e to run up

page_text: the inclined surface of either the lever d or d thereby compressing the spring 9.
After passing the axis upon which the aforesaid T shaped lever rotates the roller e
would have a tendency to put in motion with increasing force the shaft d' on which
the lever d or d² the switch h or h¹ and the lever ut or u is fixed but is opposed by
the spring g or whose force decreases by the alteration from an angular position
to the position in which each of the points or are in the same plane but when
the centre is passed said spring assists to force and keep the switch lever h or h' in
position between the jaws J or J' thereby causing a quick and definite contact of
the switch beyond the control of the operator. During the time the switches
remain out of contact the many way resistance switch keeps all the starting
resistance in circuit with the motor armatures.
The lever is supported by the catch u¹ which does not permit said lever or the
lever g of the many way switch. to descend until after the main switch has
completed contact when the levers u and u rotate the shaft u thereby releasing
the catch u¹. When the lever q is released the spring r causes said lever to rotate
upon its axis and the resistance to be cut out which is effected slowly by the oil in
the cylinder t passing down the side of the plunger t¹: when the bar a is returned
to its original position the incline plane a lifts the lever q, causing the resistance
"to. be cut in, ready for another start in either direction. the catch u' engaging as
soon as the main switch breaks contact. A switch constructed as hereinbefore
described is intended for the purpose of obtaining reversing motion: if required
for controlling motors running in one direction only, one only of the main switches
as h and one T shaped lever would be required and the bar a, would have on its
edge one only, of the inclined planes as a*.
9.
In a modification of our invention as represented in Fig. 3 we may employ
a lever as d with curved surface_on_ which the roller_e.travels, said roller is
connected to the spring g which is contained in the barrel g* moving round on the
axis d.
For electric lighting the main switch may be used independantly of the many
way resistance switch.
Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed we declare that
what we claim is :-
1st. In a quick make and quick break switch the means of obtaining the required
independent motion of the switch levers by the combination of a spring as g
a roller e levers as d and d2 pivotted in the centre of their length and connected
with the switch levers h. h 2 h³ for the purpose and in the manner substantially as
herein before described.
2nd. In a quick make and quick break switch, the combination of a lever d with
curved surface, a roller e and a spring 9 euclosed in a barrel moving round an axis,
causing the roller e to run on the curved surface of the lever. d and compressing
the spring g until power is obtained to overcome the spring g' for the purpose and
in the manner substantially as hereinbefore described.
3rd. In a controlling switch for electro motors,. the means for obtaining the
required motion for actuating the resistance switch by the use of a catch as u
actuated from the main switch and supporting the resistance switch lever q in
combination with the dash pot t and the several levers or their equivalents
substantially as described..
4th. A controlling and reversing switch for electro motors and other use
substantially as hereinbefore described.
Dated this 10th day of September 1896.
THOMAS PRESCOTT,
53 Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicants.