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, 1894
Complete Specification Left, 29th Mar., 1895-Accepted, 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 my invention to
be as follows:-
My invention has reference to locomotive engines or other engines subject to
intermittent work or varying loads more especially intended for use with tramway
engines in order that a prime mover of the power only which is necessary for
normal running can be used also with the increase of power necessary to start the
car or cars or do the required excessive work. My invention is applicable to
engines wherein the prime mover (whether it be operated by gas or by steam or by
other motive agent) pumps water or other fluid which acts as the motive agent for
operating a secondary engine which propels the tramway vehicle or does other
required work. According to my invention I provide several pumps (say four)
which may be either reciprocating or rotary pumps, and which are operated by the
prime mover and are each provided with means whereby they can each be thrown
out of action or caused to cease to act as pumps, when desired or so that one or
any number of them only can be operated to effect the pumping of the water or
fluid to operate the secondary engine. The secondary engine may be either a
reciprocating engine or a rotary engine and in the latter case it may be carried by
the axle to be driven such as for instance the driving axle of a tramway vehicle.
When all the pumps are at work the apparatus will be operating normally but
when extra power is required (as in starting a tramway vehicle for instance) one or
more of the pumps can be thrown out of action or its or their pumping effect be
discontinued so that an increased power at the expense of speed is exerted upon
the secondary engine for the requisite period to effect starting or to overcome the
temporary resistance and accommodate the speed of the vehicle to the traffic.
Dated the 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.
1 EUSTACE FITZMAURICE PIERS, Baronet, of 41 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 reference to locomotive engines or other engines subject to

page_text: intermittent work or varying loads more, especially intended for use with tramway
engines in order that a prime mover of the power only which is necessary for
normal running can be used also with the increase of power necessary to start the
car or cars or do the required excessive work. My invention is applicable to
engines wherein the prime mover (whether it be operated by gas or by steam or by
ther, motive agent) pumps water or other fluid which acts as the motive agent for
operating a secondary. motor which propels the tramway vehicle or does other
required work. I will describe my invention with reference to the accompanying
drawing as applied to the driving of a tram car. According to my invention
provide two or more pumps A which may be either reciprocating or rotary pumps
the pistons of which are connected by rods B. to eccentrics C or cranks on a
shaft D rotated through gearing E from a gas engine or other prime mover F.
G is a water tank from which the pumps are supplied the suction pipes H of the
said pumps dipping into the said tank. In the drawing I have assumed that there
are four pumps arranged side by side the delivery pipes | 12 13 I therefrom being
in communication with a pipe K leading to a hydraulic engine or secondary
motor L and each delivery pipe is provided with a cork or valve k by means of
which each pump can be thrown out of action or caused to cease to act as pumps
when desired or so that one or any number of them only can be operated to effect
the pumping of the water or fluid to operate the hydraulic engine or secondary
motor. The cocks or valves k can be operated by means of handles i
conveniently situated to be operated by the driver. When either of the cocks k is
operated to cut off the supply of water to the motor L, and the pump continuing
to work, the water is returned by a pipe 1 to the supply tank G. is the exhaust
pipe from the motor L by which the water after acting in the engine is conducted
back to the tank G. The secondary motor may be either a reciprocating engine
as shewn or it may be a rotary engine and in the latter case it may be carried by
the axle to be driven such as for instance the driving axle of a tramway vehicle.
When all the pumps are at work the apparatus will be operating normally but
when extra power is required (as in starting a tramway vehicle for instance) one or
more of the pumps can be thrown out of action or its or their pumping effect be
discontinued so that an increased power at the expense of speed is exerted upon the
hydraulic engine or secondary motor for the requisite period to effect starting or to
overcome the temporary resistance and accommodate the speed of the vehicle to
the traffic.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what
I claim is.
In connection with locomotive engines or other engines subject to intermittent
work or varying loads the combination with the primary motor and two or more
pumps operated by the said primary motor for pumping water or other fluid which
acts as the motive agent for operating a secondary motor, for propelling a tramcar
or for doing other work, means whereby any one or more of the said pumps may be
caused to cease to act as a pump whereby increased power of the secondary motor
may be obtained at the expense of speed substantially as herein before described.
Dated this 29th day of March 1895.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.