AN AUTOMATIC VACUUM BRAKE MACHINE."
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Thomas William Bailey at the Office
of the Commissioners of Patents on the 7th July 1880.
THOMAS WILLIAM BAILEY, of Bagshot, in the County of Surrey. "AN AUTOMATIC
VACUUM BRAKE MACHINE."
A brake machine automatic, instantaneous, and under the control of both guard
and engine driver, and to consist of the following parts-Letter A being a
cylindrical or square shaped supplementary vaccuum chamber, in connection with
the air pump D and the cylinder B by means of two metalic, or india rubber pipes.
In the centre of chamber is shewn a cylindrical metalic plunger working in guides.
At one end of plunger represents an india rubber bellows shaped cap fastened
to end of plunger and to outside of chamber, so to allow the plunger to work
freely, and also to prevent the admittance of air into the chamber.
At the other end of plunger is fastened a spiral spring, the spring being also
attached to the inside end of chamber. This spring is sot or regulated so that
at a determined depression of the atmosphere, say at 20 inches by a vacuum
guage, it will allow the free inward motion of the plunger, and lift the lever (C) by
ineans of the chain fastened at the end of the lever (C), and passing over the wheel
No. (1) to the end of plunger connection; acting reversely on the depreciation
of the quality of the vacuum, allowing the plunger to work outward, and so
allowing the lever (C) to drop. Also on chamber (A) is shewn a piston
shaped valve working in a small cylinder, so that on the raising of the small
lever attached to end of valve spindle the piston travels forward and opens com-
munication with the atmosphere and the cylinder (B); and on the dropping of the
lever, communication is opened with the cylinder (B) and the chamber (A). The.
small piston valve spindle to have a covering same as small plunger, namely, a india
rubber bellow-shaped cap. The small valve lever to be worked as will be described
on in like manner as lever (2).
Letter B). The working cylinder, a sectional view shewn in No. (12).
Letter (C). An intermediate friction wheel lever having a guide at No. (7), also
having a working joint at No. (10), and worked as described in letter (A).
Letter (D). A small air pump or exhauster fixed to cylinder (B), shewing valves
and valve chamber. Also a hollow plunger with a leather (covered with india
rubber) bellows shaped cap or other Bexible material, one end of the same to be

page_text: fastened to end of plunger, the other end fastened to flange on pump so to obviate
the use of stuffing boxes and packing.
Letter (E). The axle of railway carriage shewing a friction wheel fastened to it.
Letter (F). An intermediate friction wheel connected to lever (C), having a
slightly loose motion. On the using of the lever (C) the spring No. (9) acts on (F),
drawing it away from wheel on (E).
Letter (G). A frictional wheel giving motion to the plunger on (D), geared and
ungeared by the lowering and raising of lever (C).
Figure (1). A small wheel as described in description of (A).
Figure (2) shewing a double arıned lever, or rather two levers on one shaft,
under wheel at (17). A chain passes to wheels (11) and (13), over these wheel, and
so on in like manner under each carriage until it reaches the engine tender and
guard's van. In the case of guard's van not being at end of train, a letter J hook fixed
to each end of every carriage. The chain could be fixed to the hook at end of last
_carriage, and so keep all in working order. Wheels (11) and (13) to be placed at
the end of each carriage. A little above the centre of wheel-(1-7), on-the-chain being
loosed at engine or guard's end, the chain would belly or centro of chain would drop
sufficient to allow the proper fall of lever (2); on the tension of chain lever (2)
would rise and so rise lever (C).
The
It is necessary to have one lever, as lever (2), on each side of carriage, or one
only underneath each carriage, so as to admit of connecting carriages at either end,
dropping a carriage at station or goods depot, or taking other carriage on.
small lever of piston valve on letter (A) to be worked in like manner as described
with lever (2). The working of lever (2) could be dispensed with, working entirely
by chamber and gear of (A); either arrangements admits of the same adaptability
to the requirement. A small winch for the working of chain on engine tender
-and-guard's van.
Figure (12). A sectional view of vacuum cylinder, shewing-hollow-piston rod
passing through same. At (16) represents a flexible india rubber cap fastened to
flanges of cylinder and top of dome end of piston. This arrangement will permit
of the piston working up and down perfectly air tight. The piston is shown
with extra depth, so to act as a guide or give more stability. As shown in letter
(A) when (B) and (A) are in communication by the dropping of valve lever, the air
in (B) rushes into (A), producing partial vacuum in B, so rising rod and brake gear.
One lever only is proposed to be fixed to piston rod direct to fulcrum and shoe of
brake. On the release of the air in (B) to (A) the pump (D) would be set in
motion, and so cause a greater pressure on brake gear.
Figure (8). A connecting rod connected to end of plunger and worked on
wheel (G) by crank or excentric motion.
Figure (5). A small valve (slide) closing an orifice on cylinder B when lever (C)
is in gear, opening orifice when lever out of gear.
Figure (14). A small two way cock to be used in conjunction with lever No. (2).
This machine working brake with a vacuum less likely to get out of order than
working by pressure or compressed air or liquid. It is durable, easy of repair. The
size would not exceed three feet by two feet. Chamber (A) can be fastened to
cylinder (B) side by side; it is shewn in Drawing in advance.