IMPROVEMENTS IN TRAMWAY LOCO- MOTIVES
Year: 1877

page_text: LETTERS PATENT to Francis William Fox and Edwin Walker, both of the
City of Bristol, for the Invention of "IMPROVEMENTS IN TRAMWAY LOCO-
MOTIVES."
Sealed the 4th June 1878, and dated the 7th December 1877.
PROVISIONAL SPECIFICATION left by the said Francis William Fox and
Edwin Walker at the Office of the Commissioners of Patents on the 7th
December 1877.
FRANCIS WILLIAM Fox and EDWIN WALKER, both of the City of Bristol. "IM-
PROVEMENTS IN TRAMWAY LOCOMOTIVES."
Our Invention relates to various improvements, herein-after described, in tramway
locomotive engines, having for their object promoting the efficiency of such engines
and minimizing the danger and inconvenience attending their use upon the public
WAYS.
In carrying out our Invention we employ cylinders placed outside the frames
and kept as high as possible so as to be out of the reach of the mud, and also in the
most convenient position for removing covers and effecting repairs.
We also employ a differential brake or brakes, consisting of a strap passed round
a pulley keyed on one of the axles, the said strap being attached to and worked by
a differential lever or levers mounted on a cross shaft which rests on bearers on a
cross bar supported at its ends on the axle boxes or springs.
The brake may be put on by the driver either with foot levers or with a hand
lever, as may be found most convenient.
The brake strap is provided with a lining of wood, leather, or other suitable
material, which may be adjusted, in order to compensate for wear, by the act of
tightening a nut within which works a right and a left handed screw, forming the
connection between one of the levers or one of the arms of the lever and the brake
stran

page_text: We provide at one or both ends of the engine a fixed screw jack for the facility
of derailing or rerniling the engine The jack is fitted with a roller, so that in case
of accident to either of the axles, the engine can be run on two wheels and the
roller.
The roller is fixed on the end of the screw which is guided in a case screw
threaded for its reception, the weight of the engine being carried on suitable frame
stays when the jack is applied.
The engine can also be steered by this arrangement with a handle dropped into
a recess formed in the end of the screw (and which may be covered by a cap), the
same handle being used for lowering the screw and roller. This jack may also be
actuated by steam.
We further employ in combination with the engine a hydraulic jack for lifting
and sluing the engine, and fitted with a traversing slide. This jack may be worked
by a pump and hand lever in connection with the jack, or by a pump fixed
independently of the jack and connected with a flexible pipe, the traversing slide 1
being worked by a lever or ratchet. It will thus be seen that the engine can be
derailed, rerailed, or turned round, or traversed sideways in case of necessity, whilst
the apparatus also acts as a permanent jack in lifting the engine for repairs. This
jack may also be actuated by steam
The exhaust steam is conducted into a large chamber in the smoke box, first 2
through a spiral wire nozzle and afterwards through an annular nozzle or through
either of these nozzles alone, in order to prevent noise.
A similar arrangement of wire nozzle may be applied to the safety valves.
Any one of the before-mentioned improvements may be used alone, or any two
or more or the whole of the improvements may be employed in combination, as 2
desired.