Improvements in or appertaining to Air Springs or Buffers for Railway Trains or other purposes.
Year: 1895

page_text: Date of Application, 24th May, 1895
Complete Specification Left, 24th Feb., 1896-Accepted, 28th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Air Springs or Buffers for
Railway Trains or other purposes.
I, ROBERT WAUGH of 19 and 20 Dowlais Chambers, Bute Docks, Cardiff,
Agent, do hereby declare the nature of this invention to be as follows:-
This invention relates to air spring such as described in my Patent, No. 7361/93,
and my new improvements are more especially designed for buffers for railway
carriages, though most of them are applicable for springs in nearly all other
positions. In air springs for buffers for railway carriages where a very great
strain is suddenly brought upon them, special arrangements are required in order to
insure the air not leaking past the piston. For this purpose therefore I arrange
the piston with a peculiar form of cup leather projecting beyond the inner face of
the piston. The pressure of the air consequently inside the cup forces the leather
against the cylinder and consequently the greater the strain, the greater the
pressure of the leather against the side to resist the escape of the air. The cup
leather can be fixed in the piston head in any desired manner.
These buffers can
be actuated by means of the air from the back pressure of the vacuum brake or in
pneumatic brakes from the air pressure pipes. The air pressure in either case
passes through a non-return valve, thus any slight leakage which may occur in the
buffers is made good at each use of the brake in the case of the vacuum brake and
exactly as it occurs with the pneumatic brake or other independent supply of air.
In some instances where a piston and cup leather may give too much resistance,
I may use a collapsible cylinder or box on the same principle as the accordeon or
the corrugated chamber of an aneroid; the piston rod or other device for receiving
the shocks which are to be deadened is then fixed to the diaphragm or moving end
of the accordeon like chamber. A cylinder of india rubber can even be made use
of for this purpose, it being supplied with a non-return valve for the admission of
air under compression as already described.
Dated this 23rd day of May 1895
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in or appertaining to Air Springs or Buffers for
Railway Trains or other purposes.
I, ROBERT WAUGH of 19 and 20 Dowlais Chambers, Bute Docks, Cardiff,
Agent 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 :-
This invention relates to air springs, and my new improvements are more
especially designed for buffers for railway carriages, though they are applicable
for springs in nearly all other positions. In air springs or buffers for railway
carriages where a very great strain is suddenly brought upon them, special arrange-
ments are required in order to insure the air not leaking past the piston. For this
Price Bu

page_text: purpose therefore, I arrange the piston with a peculiar form of cup leather pro-
jecting beyond the inner face of the piston thus forming a piston head in itself.
The pressure of the air consequently inside the cup or piston head forces the
leather against the cylinder and consequently the greater the strain, the greater
the pressure of the leather against the side of the cylinder to resist the escape of
the air. This cup leather can be fixed in any desired manner. These buffers can
be actuated by means of the air from the back pressure of the vacuum brake, or
in pneumatic brakes from the air pressure pipes. The air pressure in either case
passes through a non-return valve, thus any slight leakage which may occur in the
buffers is made good at each use of the brake.
The accompanying drawing depicts in sectional elevation my improved air
spring or buffer as applied to a buffer for railway carriages. In this figure, A. is
an airtight cylinder in which the piston B is adapted to work, said cylinder being
closed at one end and at the other provided with a guide for the piston rod C at
the end of which is the buffer head D. E is an air inlet from the automatic or
Westinghouse brake through which the cylinder is charged with air. F lugs cast
on cylinder and bolted to the under frame of the carriage, and G a cup leather
projecting beyond the inner face of the piston B. The pressure of the air inside
the cup G forces the leather against the cylinder A, and consequently the greater
the impact against the buffer head D, the greater the pressure of the leather
against the side of the cylinder to resist the escape of air. The cup leather G
forms a perfect airtight joint, the cup being made deep as shown, otherwise it is
liable not to expand sufficiently to make the piston airtight. It may be fastened
to the piston by means of a screw H and washer J.
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. The improvement in or appertaining to springs or buffers for railway
trains or other purposes where special arrangements are required in order to
ensure the air not leaking past the piston, namely, providing the piston with
a cup leather projecting beyond the inner face of the piston, the said cup
leather being so formed and arranged that the air pressure inside the cup will force
the leather against the cylinder, whereby the greater the strain the greater the
pressure of the leather against the side of the cylinder to resist the escape of air,
substantially as described.
2. The combination with the piston of an air spring or buffer, of a cup
leather (G) formed and arranged substantially as described and shown on the
accompanying drawing and for the purpose set forth.
Dated this 24th day of February 1896.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.