Railway-Construction Car. Page: 4 of 6
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487,045
rod 27 connected with its cross-bar 24sand
jointed to a rocking arm i, which is mounted
on a rock-shaft 29 in bearings on the under
side of the center beams of the car. In the
present instance said rocking arm is in the
form of a loop which extends below said rock-
shaft.
A pair of drums 30, forming in effect one
double drum, is mounted at each end of the
car between the center beams thereof, and'
each drum of a pair is joined to one of the
platform-sections by a flexible connection 31,
which passes over a roller 32, mounted above
the drum in a suitable bracket 33, and set ob-
liquely. Said flexible connection passes
through a guide 34 on the inner part-of the
platform-section, and is joined to a strip 35,
secured across the outer side of said platform-
section. (See dotted lines in Fig 6.) Two
drums on one side of the-centrallongitudinal
line of the .car are connected with one of the
platform-sections and the other two with the
other section. It will be seen .the windingof
the flexible connections upon the drums will
draw the platform-sections down on the slide-
ways 10 and then inward until they meet. A
cog-wheel 36 is interposed between each pair
of drums, and a toothed segment 37 gears
into said cog-wheel and has a. depending hi-
furcated arm 38, said segment being mounted
on a shaft in bearings on the under side of
the center beams of the car.
A cylinder 39 is supported by brackets 40,
depending from the central beams of the car,
and two pistons 41 are in said cylinder. Each
of said pistons has a rod 42, which extends
through the bifurcated arm 38-of one of the
segments 37 and also through the looper of one
of the rocking arms 28, and said rod has pro-
jections43 on opposite sides. of each of said
parts-viz., the bifurcated arm and the looped
rocking arm. A pipe 45 extends from a box
46, secured on the under side of oneeof the car-
frame sills 2, and has branches 47:47, which
enter the two opposite ends of the cylinder 39.
Another pipe 48 extends from said box 46, and
has a branch 49, which enters the mraiddle; of
the cylinder. An exhaust-valve isinserted in.
each pipe, and comprises acasing50,into which
> the pipe opens, and a piston slide-valve 51,
fitting closely the bore of said casingand hav-
ing-an annular passage 52 on the exterior and
a central passage 53 extending through it in
the line of the pipe, but being of smaller area
; than the bore of said pipe. This through-pas-
sage is indicated in dotted lines in, Fig. 8. The
valve has a guide-stem 54, fitting -a bore of the
casing, and a spring 55 fits about said: stem
and holds the valve to the right. A branch
> 56 of the pipe 48 enters the casing of the:ex-.
haust-valve in the pipe 45, and is normally
closed by the piston-valve having position
over it, and a branch 57 of the pipe 45 enters
the casing of the exhaust-valve in the other
5 pipe 48, and is likewise normally closed by the
piston-valve in said casing. In each: valve-case an exhaust-port 58 is in the side opposite
the branch pipe, and is adapted to be placed
in communication therewith through the an-
nular passage 52, when the piston-valve is 70
moved to the left. A train-pipe 59, for carry-
ing the fluid from the locomotive, enters the
box 46. Each of: the pipes 59, 45, and 48 is
controlled by a separate valve in the form of
an ordinary one-way cock 60, fitting a bore in 75
the box 46; and by means of said valves either
of the pipes 45 or 48 may be put in communi-
cation withthetrain-pipe. Saidbox communi-
cates with the train-pipe on the next car by a
nipple 61. Each valve 60 has a stem 62, ex- 80o
tending upward along the bolster 5 of the car-
frame in suitable keepers and provided with
a handle 63 for turning it.
The operation is as follows: In the normal
closed condition of the car the pistons 41 are 85
at the two opposite ends of the cylinder and
the flexible connections 31 arewound upon the
drums. Compressed air isbetween thepistons,
having:been admitted through the pipe:4S by
opening thevalve 60,which controls said pipe. 9o
To release the platform-sections and dump
the load carried thereon, the said valve is
closed and the valve controlling the pipe 45 is
opened. The compressed air now enters-said
pipes 45, and reaching the exhaust-valve in the 95
same exerts pressure against the-head of the
piston-valve 51 and forces the same back to
a position where the annular passage 52 es-
tablishes a communication between. the
branch pipe 56 and: the port 58 and thereby ioo
releases the compressed air from between the
pistons 41. At the same time compressedair
passes through the branch pipe 47 into one
end of; the cylinder and through the central
passage 53 in the exhaust-valve to the branch 105
pipe 471 and therethrough into the opposite
end of the cylinder. Compressed air being
thus introduced on the outer sides of the two
pistons and that between being exhausted, the
pistons are forced together. This causes the I1O
projections on the piston- rods to turn the
segments 37 and unwind the drums 30 and
also to shift the rooking arms 28 and thereby
slide-the double latches-to a position where
the ends of the spring-arms 25 may pass 115
through the notches- 23 in the said sliding
latches. The platform-sections-will nowslide
down the inclined ways and dump the load.
To reclose the platforms, the controlling-valve
of the pipe45 is closed and that of the pipe I2o
48 opened and the reverse action takes place,
the exhaust-valve in the pipe 48 being opened
by the air-pressure to release the compressed
air on the outer sides of the pistons and com-
pressed air entering between. the pistons to 125
force them apart and thereby wind up the
flexible connections on the drums and draw
the platform-sections to the closed position.
At the same time the rocking arms 28 are
shifted and the sliding latches 19 moved back 130
to a position where the spring-arms 25 will
take over them. After one car is dumped the
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Brown, Carver C. Railway-Construction Car., patent, November 29, 1892; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth173235/m1/4/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.