Triple-Valve Mechanism. Page: 3 of 9
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UNITED STATESPATENT OFFICE.
WALTER F. ATWOOD, OF A1VARILLO, TEXAS.
TRIPLE-VALVE MECHANISM.1,120,584.
Specificatioii of Letters Patent.
Patented Dec. 8, 1914.
Application filed March 21, 1914. Serial No. 826,295.
To all whom it may concern:
Be it known that I, WALTER F. ATWOOD,
a citizen of the United States, residing at
Amarillo, in the county of Potter and State
of Texas, have invented certain new and
useful. Improvements in Triple - Valve
Mechanisms, of which the following is a
specification.
This invention appertains to automatic
to fluid pressure brake systems and involves
certain improvements in what are com-
monly known as triple valves by which the
application of air brakes is controlled.
One of the difficulties experienced in the
.1 operation of the triple valve as commonly
used resides in the fact that oftentimes the
main or triple slide valve does not move
promptly to release position under the ac-
tion of the triple piston connected there-
23 with, owing to a slow rise in the train pipe
pressure or the wearing of the packing
rings of said triple piston resulting in a
tendency for the train pipe pressure to
equalize on opposite sides of said piston.
25 A further object of the invention bas
been to devise instrumentalities coactiug
with the triple valve mechanism in such
manner as to readily insure a proper oper-
ation of the valve means in the event of an
K) overcharge of fluid pressure, which gives
rise to certain difficulties in regard to the
proper operation of the triple valve mecha-
nism, as well known to those versed in this
art.
L5 In the carrying out of the invention I
contemplate the provision of what may be
broadly termed an auxiliary motor in the
form of a fluid pressure actuated piston so
arranged in respect to the triple piston of
4 the main or triple slide valve as to forcibly
act through intermediate parts on said
triple piston to positively move the same
mechanically to a release position in the
event said triple piston and its slide valve
45 do not assume such release position in re-
sponse to the increase or rise in the train
pipe pressure as controlled from the en-
gineer's valve.
The auxiliary motor above referred to is
50 normally inactive and is controlled in its
operation by special control mechanism
which in turn is controlled in action by the
train pipe pressure and the auxiliary reser-
voir pressure, as will be more fully pointed
55 out in the following description and readilyunderstood in connection with the accom-
panying drawings in which:-
Figure 1 is a sectional view showing a
common type of triple valve with my im-
provements applied thereto, and the parts 60
arranged in release position. Fig. 2 is a
view similar to Fig. 1 showing the several
cooperative mechanisms in the lap position.
Referring to Fig. 1 particularly, I will de-
scribe the detail construction of the im- 65
provements forming the essential feature of
this invention, as combined with the triple
valve mechanism. The triple valve illus-
trated need not be described in detail, coin-
prising as it does a conventional construc- 70
tion including the triple piston 1, its stem
2, the main or triple slide valve 3, emergency
piston 4, and emergency and check valves 5
and 6 respectively. The train pipe is con-
nected with the casing of the valve mecha- 75
nism at 7 so that train pipe pressure will be
admitted to the chamber A which is con-
nected by a passage S with the chamber B
that contains a graduating spring 9 and other
parts, from which chamber B the train pipe 8o
pressure passes into the triple piston cham-
ber C through the small passages 10 in the
end wall of said chamber. Auxiliary air
pressure from the auxiliary reservoir is ad-
mitted to the chamber D as usual, the stem 85
of the triple piston 1, and the slide valve 3,
operating in the chamber D as customary.
At the other end of the chamber B and
separated from said chamber by a partition
11 is the auxiliary chamber E which con- 9o
tains the motor or working piston 12 located
at one side of said partition 11. At its oppo-
site side the partition 11 supports a small
cylinder 13 which is preferably an extension
of the partition and in said cylinder 13 op- 95
erates a normalizing piston 14 which is of
considerably smaller area than the piston
12. A stem 15 connects the two pistons 12
and 14 and a stein 16 projects from the pis-
ton 14 in the direction of the triple piston 1. 100
The sten 16 is located in substantial aline-
ment with a graduating stem 17 which pro-
jects from the triple piston 1 and has the
annular shoulder 18 intermediate its ends.
Surrounding the cylinder 13 and having a 105
bearing at one end against the partition 11
is the coiled spring 9 previously referred to,
the opposite end of said spring engaging in
a suitable flange of a thimble 19 which is
held against the wall 20 of the chamber C. 15
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Atwood, Walter F. Triple-Valve Mechanism., patent, December 8, 1914; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859597/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.