Air-Brake Page: 2 of 3
[1], 2 p. : ill. ; 23 cm.View a full description of this patent.
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IUYNITED STATESPATENT OIFICKO
W hIIi A E. AD, OF MASHAL, TXAS.AIR-B AKe sa
Specification of Letters Patent.Application died June 21, 1911. Serial No. 834,480.
To all whom it may concern:
Be it known that I, WThLI A E. Mn, a
citizen of the United States, residing at
Marshall, in the county of Harrison and
5 State of Texas, have invented certain new
and useful Improvements in Air-Brakes, of
which the following is a specification, refer-
ence being had to the accompanying draw-
ings.
10 This invention relates to fluid pressure
brakes in general and more particularly to
improvements in and about the cylinder that
actuates the brake system when the fluid
under pressure is permitted to flow therein.
15 The object of this invention is to provide
a device which will cause the brakes to act
positively on the wheels and yet have a cer-
tain amount of resilient action which will
eliminate greatly the jerking action of the
20 present systems, because it is well known
that in the ordinary types of brakes used
in every day life on trains and the like that
the brakes act 'so suddenly on the wheels
that they are given a somewhat chattering
25 action which is detrimental to the brake
shoe and also to the wheel.
Another object of this invention is to have
the brake arranged so that it will apply the
brake shoes simultaneously to the various
30 wheels, and with an equal amount of pres-
sure.
Other objects of this invention will be-
come apparent as it is more fully set forth.
In the accompanying drawings which
35 illustrate by way of example an embodiment
of this invention; Figure 1 represents a view
in elevation of the cylinder and brake parts
embodying this invention. Fig. 2 is a sec-
tional view of Fig. 1; Fig. 3 is a detail of
40 the piston and piston rod.
Similar reference characters refer to simi-
lar pirts throughout the drawings.
In the drawings which illustrate this in-
vention 1 represents a main casing of a
45 brake cylinder which is provided in its cen-
tral portion with a number of holes 2 that
are connected with the supply pipe 3 that
supplies air from the pump or the like to
actuate the pistons 4 of the brake cylinder,
50 which are disposed on either side of the.
- central portion of the casing, as is clearly
shown in the drawings.
The piston heads 4 are provided with hol-
low piston rods 5 that are arranged to re-
55 ciprocate in stuffing boxes 6 disposed at
either end of the cylinder. Disposed withinthe piston rods 5 are rods 7 having
springs 8 disposed at their inner end por-
tions and suitably secured to the piston as
is clearly shown in the drawings, so that the Go
actuation of the rods 7 will cause the pistons
to move also.
Fastened to the end of the rods 7 are the
levers 9 that are arranged to actuate the
brake system and apply the brake shoes on 65
the wheels, and have arranged a connecting
bar 10 which suitably pivots them and per-
mits their action in the ordinary manner.
In operation, assuming that the pistons
are in their central position, air is ad- 70
mitted in the ordinary manner into the sup-
ply pipe 3, and thence to the holes 2 into
the cylinder. The pressure exerted on the
piston heads causes them to move out-
wardly, but the rods 7 will not be immedi- 75
ately actuated thereby because their springs
8 will be compressed slightly and take up a
portion of the motion until the springs are
sufficiently compressed to cause the rods 7 to
move. This slight compression of the 80
springs gives a resilient action to the brake,
so that when the brake shoes are applied to
the wheels in the ordinary manner their ac-
tion will not be too sudden thereon.
The use of an extra cylinder 5 as shown 85
and described permits a larger wearing sur-
face to be presented to the stung box parts,
while not reducing the friction, will tend to
reduce the heat per unit area that is devel-
oped on the sleeves, which of course in- 50
creases the life of these parts. By having
the rods 7 that actuate the piston, within
the sleeves 5, arrangement is provided
whereby any inaccuracies in the adjustment,
or attachment of the levers 9 will be taken 95
care of, because a certain amount of move-
ment is permitted to the rods 7 in the sleeve
5, which leeway does not effect the proper
action of the brake system.
Obviously while there is shown but one 100
modification of the construction of this in-
vention in the drawings, it is not.desired to
limit this application to that one construc-
tion in any way, otherwise than necessitated
by the prior art, as many modifications in 105
the construction of this invention can be
made without departing from the principles
thereof.
In order to provide means whereby the
pistons will be forced back to their normal 110
positions, when the pressure of air is removed
from the interior of the cylinder, the springs-1, 7,1 .
PatentedFeb. 13,1912.
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Reference the current page of this Patent.
Mead, William E. Air-Brake, patent, February 6, 1912; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth514937/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.