Improvements in or connected with Locomotive Engines, or other Engines subject to Intermittent Work or Varying Loads, more especially intended for use with Tramway Engines.
Year: 1894

page_text: Date of Application, 29th May, 1804
Complete Specification Left, 29th Mar., 1895-Acceptel, 24th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in or connected with Locomotive Engines, or other
Engines subject to Intermittent Work or Varying Loads, more
especially intended for use with Tramway Engines.
I, EUSTACE FITZMAURICE PIERS of 41 Finsbury Pavement in the City of
London Mechanical Engineer do hereby declare the nature of this invention to be
as follows:-
--
My invention has for its object to provide means whereby the speed of tramcars
or other vehicles driven by gas steam electricity or other like power may be
controlled and regulated as required.
According to my invention as applied to a tramcar for instance I employ a
combination of a gas engine or other primary motor, a hydraulic engine or
secondary motor a pump or pumps actuated by the primary motor for supplying
water under pressure to the secondary motor and an eccentric or equivalent device
for regulating the stroke of the pump or pumps whereby the supply of water under
pressure to the secondary motor is such that as the power exerted on the water
increases the speed decreases and vice-versa. A further part of the combination
consists of a valve or valves in a pipe or pipes communicating between the pump
or pumps and the secondary motor the opening of which valve or valves relieves
the pressure from acting on the piston of the secondary engine.
In order to vary
the stroke of the pump or pumps the throw of the eccentric can be varied as
required by means of a screw or other device. Instead of an eccentric an adjustable
block to which the pump rod or pump rods is or are attached can be adjusted in
position by means of a screw or other suitable device nearer to or further from
the centre of rotation so as to alter the stroke of the said pump or pumps and
consequently vary the quantity of water supplied to the secondary motor whereby
the power exerted by the water may be increased and the speed of the secondary
motor decreased accordingly or vice-versa.
Dated this 29th day of May 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Locomotive Engines, or other
Engines subject to Intermittent Work or Varying Loads, more
especially intended for use with Tramway Engines.
I, EUSTACE FITZMAURICE PIERS Baronet of 47 Finsbury Pavement in the
City of London, Mechanical 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 :-
My invention has for its object to provide means whereby the speed of tramcars
or other vehicles driven by gas steam electricity or other like power may be
controlled and regulated as required.
According to my invention as applied to a tramcar for instance I employ in

page_text: combination a gas engine or other primary motor, a hydraulic engine or secondary
motor a pump or pumps actuated by the primary motor for supplying water under
pressure to the secondary motor and an eccentric or equivalent device for regulating
the stroke of the pump or pumps whereby the supply of water under pressure to
the secondary motor is such that as the power exerted on the water increases, the
speed decreases and vicc-versa. A further part of the combination consists of a
valve or valves in a pipe or pipes communicating between the pump or pumps and
the secondary motor the opening of which valve or valves relieves the pressure
acting on the piston of the secondary engine. In order to vary the stroke of the
pump or pumps the throw of the eccentric can be varied as required by means of a
screw or other device. Instead of an eccentric an adjustable block to which the
pump rod or pump rods is or are attached can be adjusted in position by means of
a screw or other suitable device nearer to or further from the centre of rotation so
as to alter the stroke of the said pump or pumps and consequently vary the quantity
of water supplied to the secondary motor whereby the power exerted by the
water may be increased and the speed of the secondary motor decreased accordingly
or vice-versa.
Fig. 1 of the accompanying drawings represents in side sectional elevation and
Fig. 2. in plan so much of a tram car as is necessary to illustrate my invention
and
Figs. 3 & 4. are elevations at right angles to each other (drawn to a larger scale)
of the speed regulating mechanism of the car detached and
Figs. 5 & 6 are views similar to Figs. 3 & 4. showing another form of speed
regulating mechanism.
A represents a gas or petroleum engine or prime motor and B a crank shaft
operated thereby. From the shaft B rotation is imparted by gearing C to a
shaft D carrying a disc or crosshead E to which is adjustably connected the rod F
of a pump G by which water is forced into the cylinder or cylinders of the
hydraulic engine or secondary motor H, from which secondary motor motion is
given to the car through the connecting rod or rods I and cranks K on the axle
of one of the pairs of running wheels of the car. The pump rod F is connected
by a rod L to a block M Figs. 3 & 4 fitted to slide in an opening N in the disc or
crosshead E the said block being adjustable in the said opening by a screw O
turning in bearings in the ends of the opening N and working in a nut or screw
thread formed in the block so that by rotating the screw in one direction or the
other the block will be caused to move nearer to or further from the axis of the
disc or crosshead and so vary the extent of travel of the pump piston and
consequently the quantity of water forced into the cylinder of the hydraulic
engine.
P
The shaft D rotates in a pedestal or non-rotating sleeve P on the exterior of
which is a helical projection or helical projections or screw thread
which engages
a corresponding groove p² in, or projections on the boss of a cap or cover R
which partially encloses the disc or crosshead E. One end of the screw O projects
through one end of the crosshead or the periphery of the disc E and carries a
wheel or enlargement S with which one or other of two annular flanges or rims & s
on the interior of the periphery of the cap or cover R may be brought into
frictional contact so as to give rotation to the screw O and thereby traverse the
block M, to which the rod of the pump is connected, towards or from the axis o
the disc or crosshead according to the direction in which the screw is turned and
consequently alter the stroke of the pump piston. The cap or cover R may be
moved longitudinally on the pedestal or sleeve P, while the car is running, by
means of a lever conveniently situated for operation by the driver the said leve
being connected by a rod or rods R³ to the cover R so that by moving this leve
on its fulcrum in one direction or the other a partial rotation will be given to the
said cover and by reason of the engagement thereof with the helical projection o
projections or screw thread on the sleeve or pedestal P cause the cap or cover
to move longitudinally on the said sleeve or pedestal and so bring one or other of

page_text: the flanges or annular rims s or into frictional contact with the wheel or
enlargement S according to the direction in which the lever is moved. The lever
is preferably provided with a spring bolt to engage with a slot to retain the
cover R in its normal or mid-position with the flanges ss out of engagement with
the wheel or enlargement S.
b
Instead of the sliding block M to which the pump rod is connected as herein-
before described I may provide an adjustable eccentric as shewn in Figures 5 and 6
in which figures D represents the shaft driven by gearing from the crank shaft B
operated by the primary motor as hereinbefore described. On a rectangular part
of the shaft C is fitted to slide an adjustable disc or eccentric E the extent of
eccentricity thereof being varied by sliding the said disc in one direction or the
other in a transverse direction on the rectangular part 6 of the shaft D.
Fitted to turn in a recess 62 in the block is a nut S engaging with a non-rotating
screw O carried by the disc or eccentric E' so that by turning the said nut in one
direction or the other the disc or eccentric E' is traversed on the part 6 of the
shaft D whereby the eccentricity of the said disc is varied and consequently the
stroke of the pump piston (which is connected to the eccentric strap) increased or
reduced according to the direction in which the nut S is turned.
On the pedestals which support the shaft D are helical projections or screw
threads p which engage projections or grooves in discs or segments of discs s s³
which are connected by suitable rods to a lever or levers conveniently situated to
be operated by the driver so that by moving the said lever or levers in one direction
or the other the discs or segments & s² may be partially rotated on the pedestals
and, by reason of the engagement of the helical projections or screw threads p with
the projections or grooves of the discs, cause one or other of the said discs to come
into frictional contact with the nut S and impart rotation thereto and thereby shift
the position of the eccentric disc E and so vary the stroke of the pump more or
less as required.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In connection with locomotive engines or other motive fluid engines subject to
intermittent work or varying loads the combination with the primary motor, of a
hydraulic engine or secondary motor, a pump or pumps actuated by the primary
motor for supplying water to the hydraulic engine or secondary motor, and means
for varying the stroke of the pump or pumps whereby the supply of water under
pressure to the secondary motor is such that as the power exerted on the water
increases the speed of the secondary motor decreases and vice versa substantially as
herein before described.
2. For driving tramcars or other similar vehicles, the combination with a gas
engine or other primary motor, of a hydraulic engine or secundary. motor, a pump
or pumps actuated by the primary motor for supplying water under pressure to
the secondary motor, and an adjustable eccentric or equivalent device for varying
the stroke of the pump or pumps substantially as and for the purpose hereinbefore
described.
3. The combination of parts constituting the means for varying the stroke of the
pump substantially as hereinbefore described and illustrated by Figures 2 and 3 of
the accompanying drawings.
4. The combination of parts constituting the means for varying the stroke of the
pump or pumps substantially as herein before described and illustrated by Figures 4
and 5 of the accompanying drawings.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.