Brake Apparatus for Gas Motor Locomotives or Cars.
Year: 1893

page_text: Date of Application, 1st Nov., 1893
Complete Specification Left, 25th July, 1894-Accepted, 1st Sept., 1894
PROVISIONAL SPECIFICATION.
Brake Apparatus for Gas Motor Locomotives or Cars.
I HENRY PERCY HOLT, of No. 10 St. Bride Street, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to brake apparatus for gas motor locomotives or cars so
arranged that the pressure of the gas, which is stored for consumption in producing
motive power, is utilised for working the brakes. For this purpose, I connect the
reservoir in which the gas is stored at a pressure of several atmospheres to a small
brake reservoir through a reducing valve so that the pressure in that reservoir is
so far above atmospheric pressure that when gas from it is by the movement of a
valve admitted into a brake cylinder to act ou a piston connected to the brakes, the
brakes are put on with sufficient force.
· The brakes are taken off by a back movement of the valve by which the gas
that operated on one side of the piston is allowed to pass from that side to a larger
space at the other side, thus putting the piston in balance as to pressure, whereupon
the brakes are taken off by a suitable spring. From the space into which the gas
had thus expanded there is a passage to the supply valve of the engine. When the
brake is not in operation, the engine is supplied through a reducing valve preferably
from the brake reservoir.
I prefer to pass the brake piston rod through a flexible diaphragm which covers
the end of the brake cylinder, and which at its middle is attached to the piston rod,
this diaphragm being bulged out when the brake piston is moved to put on the
brakes and thus increasing the space beyond the piston into which the gas expands
when the brakes are taken off.
Dated this 1st day of November 1893
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Brake Apparatus for Gas Motor Locomotives or Cars.
I, HENRY PERCY HOLT, of No. 10 St. Bride Street, in the City of London,
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 relates to brake apparatus for gas motor locomotives or cars so
arranged that the pressure of the gas, which is stored for consumption in producing
motive power, is utilised for working the brakes. For this purpose, I operate the
brakes as I shall describe referring to the accompanying drawings.
Fig. 1 is a side view of the lower part of a gas motor locomotive.. Fig. 2 is a
vertical section and Fig. 3.a sectional plan of the brake cylinder.
I connect the reservoir in which the gas for working the engine is stored at a
pressure of several atmospheres to a small reservoir through a reducing valve by
which the pressure is considerably reduced.
In that small reservoir however the pressure is still so far above atmospheric
pressure that when gas from it is by the movement of a valve admitted into a
brake cylinder to act on a piston connected to the brakes, the brakes are put on
with sufficient force.

page_text: The brakes are taken off by a back movement of the valve by which the gas
that operated on one side of the piston is allowed to pass from that side to a larger
space at the other side thus putting the piston in balance as to pressure, whereupon
the brakes are taken off. by a suitable spring. From the space into which the gas
had thus expanded there is a passage, to the supply valve of the engine. When
the brake is not in operation, the engine is supplied through a reducing valve
preferably from the small reservoir containing the gas for operating the brakes.
I prefer to pass the brake piston rod through a flexible diaphragm which covers
the end of the brake cylinder, and which at its middle is attached to the piston rod,
this diaphragm being bulged out when the brake piston is moved to put on the.
brakes and thus increasing the space beyond the piston into which the gas expands
when the brakes are taken off.
Referring to Fig. 1, A is the brake cylinder, the piston of which depressing the
lever B causes the brake blocks C to be pressed against both wheels. When
the lever Bascends, the brakes are taken off. As shewn in Figs. 2 and 3,
the cylinder A is provided with a slide valve D which in middle position puts the
upper end of the cylinder, which has two ports, in communication by an exhaust
passage I with the lower end. When the valve D is moved, in either direction, so,
as to uncover one of the ports it covers the entrance to the exhaust passage. The
lower end of the cylinder is covered by a flexible diaphragm E attached to the
piston rod which is connected to the lever B. From the space above the diaphragm
a pipo e leads to the gas supply valve.
The piston F may be packed as shewn by a rolling caoutchouc ring.
A spring G strains the lever B upwards.
At each end of the car there is a lever L connected to the rod of the slide
valve D.
When the driver or conductor standing on a platform at the end of the car,
desires to put on the brakes, he, by means of this lever L, moves the slide valve D,
it may be in either direction. Thereupon gas under moderate pressure admitted to
the valve case by the pipe H, leading from the reservoir above referred to as being
fed through a reducing valve from the main reservoir, acts upon the piston
forcing it and the lever B down in opposition to the spring G and thus causing the
brake blocks to press upon the wheels. For taking off the brakes, the slide valve
is moved to its middle position, putting the upper end of the cylinder in com-
munication with the lower end. The spring G then raises the lever B and the
piston F, taking off the brakes, and the gas passes from above the piston to the
larger space below it in which it expands to a less pressure and whence it goes by
the pipe e to supply the engine.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Brake apparatus for gas locomotives wherein gas supplied at moderate pressure
through a reducing valve from the reservoirs of compressed gas, is by means of a
valve, worked by driver or conductor, made to operate on a brake piston.so as to
put on the brakes, and the gas which so.operates is conducted, when the brakes are
taken off, at reduced pressure to supply the gas motor engine.
Dated this 24th day of Jul, 1801
ABEL & IMRAY,
Agents for the Applicant.