Improvements in Speed Regulating Devices, Chiefly Intended for Use with Dynamo Electric Machines.
Year: 1896

page_text: Date of Application, 17th July, 1896
Complete Specification Left, 14th Dec., 1896-Accepted, 27th Feb., 1897
PROVISIONAL SPECIFICATION.
Improvements in Speed Regulating Devices, Chiefly Intended for
Use with Dynamo Electric Machines.
I, MONTAGU WILLIAM CONSETT, of 58 Sloane Street, in the County of Middlesex,
Lieutenant Royal Navy, do hereby declare the nature of this invention to be as
follows:-
My improved speed regulating devices are more especially intended for use in
preventing the racing of dynamo-electric machines which oftentimes occurs on war-
ships when the electric circuit is suddenly interrupted during the adjustment of the
search-light carbons or from any other cause. It will be obvious, however, that my
speed regulating devices are suitable for other purposes.
According to my invention I provide on some appropriate revolving shaft of the
machine suitable frictional contrivances such as a pair of leather pads which constantly
revolve with the said shaft. These pads or other frictional contrivances are adapted
to extend outwardly from the axis of the said shaft under the influence of centrifugal
force and to bring themselves with more or less force into contact with a friction ring
which is located in a convenient position around the said shaft to be acted upon by
the leather pads. This friction ring may be made hollow for enabling cold water
to circulate through it; or it may be otherwise constructed to permit of its being
kept cool.
I also provide means whereby the position of these frictional contrivances with
relation to the said ring can be readily adjusted in accordance with the speed that the
machine is intended to run.
An advantageous manner of enabling the centrifugal force to bring the regulator
into operation, is to pivotally connect the aforesaid leather pads to discs or drums
that are mounted on horizontal axes carried by the framing of the regulator, a spring
being employed to normally keep these pads directed towards the said ring. These
discs or drums may be furnished with arms which are normally kept in an inward
position by means of springs. The outer ends of these arms may have secondary
arms pivotally connected to them and these secondary arms may have vanes at their
extremities. Springs may also be employed for resisting the outward movement of
the secondary arms when they are acted upon by centrifugal force.
In some cases the frictional contrivances I employ may consist of curved pieces
which are so arranged relatively to the friction ring that they are capable of bringing
a gradually increasing surface into contact with the said friction ring.
I do not wish to confine myself to the specific frictional devices herein stated as
others of various construction inay be employed for the purpose.
.My speed regulator may also be used in conjunction with an ordinary centrifugal
governor acting on the throttle valve.
T
1711
1
CTI
1000
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: Improvements in Speed Regulating Devices, Chiefly Intended for
Use with Dynamo Electric Machines.
I, MONTAGU WILLIAM CONSETT, of 58 Sloane Street, in the County of Middlesex,
Lieutenant Royal Navy, 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 improved speed regulating devices are more especially intended for use in
preventing the racing of dynamo-electric machines which oftentimes occurs on war-
ships when the electric circuit is suddenly interrupted by reason of the adjustment of
the search-light carbons or from any other cause. It will be obvious, however, that
my speed regulating devices are suitable for other machines.
According to my invention I provide on or in connection with some appropriate
revolving shaft of the machine to be controlled, suitable frictional contrivances such as
a pair of leather pads which constantly revolve with the said shaft. These pads or
other frictional contrivances are arranged to extend outwardly from the axis of the
said shaft under the influence of centrifugal force and to thereby bring themselves
with more or less force into contact with a friction ring which is located in a
convenient position to be acted upon by the leather pads. This friction ring may be
made hollow for allowing cold water to circulate through it; or it may be otherwise
constructed to permit of its being kept cool.
In order that my invention may be clearly understood I will describe the
accompanying drawings which illustrate a speed regulating device constructed in
accordance with my invention.
-
Figure 1 is a front elevation partly in section of a speed regulator constructed
according to my invention.
Figure 2 is a plan, and
Figure 3 an end elevation partly in section, of the same.
Figure 4 is a front elevation partly in section of the device, showing the arms
extended and the pad applied to the friction ring by the action of centrifugal
force, and
Figure 5 is an inverted plan of a modification of the friction device.
a
A is a shaft or spindle rotated through any suitable means by the dynamo or
other machine whose speed is to be controlled; this shaft carries a frame B pro-
vided with bearings a in which the spindles of two pairs of drums Care
adapted to turn. The drum C of each pair has attached to it an arm which
has pivotted to it a second arm c carrying a vane d at its free extremity. These
arms normally tend to approach the central shaft A, the arms b b being pressed in
this direction by springs e e the lower ends of which are attached to a sleeve D
adjustable longitudinally on the shaft A for the purpose of varying the tension of
the said springs which have their upper ends attached to arms e pivotted at e²
between the drums Cand C. The arms ce are also attached to and pressed inwardly
by springs (Figure 3) carried at the free extremities of the arms bb.
Between each pair of the drums C and C is pivotted at a lever E whose upper
end carries a pad or shoe h preferably of leather and the lower ends or tails of the
said levers E are both connected by a spiral spring s tending to draw, them together;
their approach beyond a predetermined point is prevented by the bosses of the
drums C, C, which thus act as stops to keep the pads h h out of contact with the
friction ring F until the centrifugal force is sufficiently great to overcome the resistance
of the springs. The ring F is fixed to the part of the frame of the mechanism which
carries the upper bearing for the shaft or spindle A.

page_text: In order to ensure the synchronous action of the arms & and the friction pads &
when the former are impelled outwardly by centrifugal force, the drums C₁ to
which the said pads and arms are attached have two thin metal bands j and j¹
(Figure 3) fixed to their peripheries. The band passes over its drum C, from a
fastening thereon, and under the opposite drum C to another fastening on the
latter drum. The band j' passes from a fastening at the top of the other drum C
under this drum and over the opposite drum C to a fastening thereon. Thus
when one of the arms bb is moved outward the pair of drums to which it is fixed is
partly rotated, whereby one of the bands; or j is pulled, so causing the other pair of
drums to rotate at the same time and in the opposite direction.
As hereinbefore mentioned the tension of the spiral springs e e is increased or
diminished by the sleeve D. This sleeve is adjustable by means of a milled nut m
along the spindle A which is screw threaded at its lower part for this purpose.
A pin n projecting from the spindle or shaft A through a slot o in the sleeve D
prevents the turning of the latter during the adjustment. By increasing the tension
of the springs ee the resistance to the force impelling the arms bb outward when the
spindle A is rotated, is also increased and the speed becomes relatively higher at
which the application of the pads or shoes & to the friction ring F takes place. By
reducing the tension of the springs e e the opposite effect is obtained, thus, by
adjusting the sleeve D on the spindle A, the speed of the machine may be
regulated.
The springs, which press the vanes d inward are each fixed at one end to the
shank of a milled head p by means of which the pressure the said springs exert
on the arms c c can be varied at will. These heads p p by means of their shanks
which can turn in bearings p' p₁ coil or uncoil the springs when turned and are
secured in the required position by means of set screws which when screwed down
tightly bear at their inner ends against the said shanks.
The mode of operation of this apparatus is as follows:-At the normal speed of
the dynamo or other machine, the vanes d, d in moving outward or inward, according
to the centrifugal force, about the centres to which the arms e e are pivotted regulate
the speed with great nicety owing to the resistance offered to their rotation by the
air, the effect of the resistance increasing as the vanes extend outward. When the
motor is relieved of its load and consequently has its speed greatly increased
the centrifugal force acting on the vanes d, d, arms e e and b b is sufficiently great
to cause them to move outward to the position shown in Figure 4. The drums CC
in this movement are caused by the armis bb, to turn about their centres in opposition
to the tension of the springs e e and so to force the pads hh against the friction
ring F. The pressure of each of the pads against the ring is equalized by the
springs which is attached to the tails of the levers E E in such a manner as to
oppose their oscillation. When moving outward the upper parts of the pads h h are
first applied to the friction ring F, and if the speed still increases notwithstanding
the friction thus set up, the pressure of the pads on the ring is augmented until the
whole rubbing surface of the pads is in contact with the ring as shown, and the
friction is sufficiently great to prevent the attainment of a dangerous speed.
In Figure 5 which illustrates a modification of the friction device, ' is the pad or
shoe pivotted so as to oscillate horizontally about the upper end of the lever E; the
toe t of this shoe or pad is pressed toward the friction ring F by a spring
the lever E at one end and bearing against a pin v at its other end. The toe t is
normally retained out of contact with the friction ring by means of a stop w fixed to
the lever E. The bearing surface of the shoe h is a curve whose ordinates
gradually decrease in length from the heel to the toe t, and when the lever E
is moved outward the toe first rubs on the friction ring; a further outward move-
ment of the lever E causes a larger part of the rubbing surface nearer the heel x
to bear on the friction ring, the friction of the shoe on the ring being caused by
the spring u. At the extreme outward movement of the arms b b and c c the
maximum of surface near the heel z is forced tightly against the friction ring by the
direct pressure of the upper part of the lever E.

page_text: My speed regulator. may be used in conjunction with the ordinary governor for
controlling the supply of motive force.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A speed regulator comprising a centrifugal device and a fixed ring concentric
therewith, so combined that as the centrifugal force increases it causes friction pads
or blocks on the said device to bear against the ring, substantially as and for the
purpose specified.
2. A speed regulator for dynamos and other machines having rotary vanes for
effecting the control when the speed is approximately at the normal, and a friction
device adapted to be brought into action by the vanes when the speed increases
unduly, substantially as described.
3. In a speed regulator of the kind described, the arrangement of the friction.
pads or blocks in such a manner that the extent of their surfaces bearing against
the stationary ring varies with the speed of the machine to be regulated sub-
stantially as described with reference to Figures 1 to 4, or Figure 5, of the
accompanying drawings.
4. My improved speed regulator having its parts constructed and combined to
operate substantially as hereinbefore described with reference to the accompanying
drawings and for the purpose specified.
Dated this 14th day of December 1896
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.