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Патент USA US2118316

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May 24, 1938.
Filed July 23, 1934
2,1 18,316
Patented May 24, 1938
John'E. Lynskey, Chicago, 111.
Application July 23, 1934, Serial No. 736,468 _
1 Claim.
My invention relates to improvements in rail
way brake application, in which four brake shoes,
suspended from brackets that are mounted on
the truck frame, are coupled together by the use
5 of links, l5. The objects of my improvements
are:--First, to provide greater braking area by
employing four brake shoes, second, to provide
facilities for the adjustment of shoe clearance and
to limit the extent of the retraction of the shoes;
10 third, to provide facilities for the contraction of
the four brake shoes in unison, fourth, to provide
facilities to synchronize the contraction with the
contraction of other sets of shoes on the same
truck frame.
I attain these objects by mechanism illustrated
in the accompanying drawing in which, Fig. 1
is the plan View of the entire assembly. Fig. 2
is the top view of the connection of the shoes by
the link, 15, and the connection of the stud-rod, 9.
Fig. 4 is
the side view of the top bracket. Fig. 5 is the side
20 Fig. 3 is the plan view of the link, l5.
view of the right bracket. Fig. 6 is the side View
of the left bracket. Fig. '7 is the side view of the
journal brackets. Fig. 8 is the plan view of all
25 brackets. These ?gures and mechanism are ex
plained as follows:—
When power is applied to the main truck rod,
No. 1, the cam-lever, 2, pulls the rod, 3, which
has a threaded clevis on each end that provides
adjustment of this set of shoes with other sets of
shoes on the same truck frame. The pull-rod, 3,
moves a cam-lever, 4, which pulls the stud-rod, 9,
and the tie-rod, 5. The tie-rod, 5, moves a cam
lever, 6, which pulls the stud-rod, Ill. Thetie
35 rod, 5, has a threaded clevis on each end to adjust
the alignment of the cam-levers, 4, and 6, which
are bushing mounted on shafts, ‘I and 8, that pass
through bushings in the journal brackets (see
I Fig. '7).
The stud-rods, 9 and II], are connected
40 to the clevised ends of the shoes, I3 and I4, and
the cam-levers, 4 and 6, by means of a washer
on each side of the cam-levers, 4 and 6, and the
shoe-clevises, l3 and I4, and a cotter-pin through
a drilled hole in the end of the rod (see Fig. 2).
The stud-rods, 9 and Ill, pull the clevised ends of
the shoes, I3 and M respectively, down and in;
thereby contracting the four brake shoes, in
unison, by means of three shoe-links, I5, which
are connected to the clevised ends of the brake
shoes by large clevis-pins, 16 (see Fig. 2).
The retracting rod, II, which has a ?xed clevis
on one end and is threaded at the other end, is
connected to the center hole of the shoe-link, 15,
by a small clevis-pin, l8, and has a locking-nut, _
adjusting-nut and a washer under the arm, 19,
of the suspension bracket and a washer, concen
tric spring, another washer, adjusting-nut and a
locking-nut on top of the bracket arm, [9, which
is slotted to allow the above assembly to slide
during the contraction and retraction of the
shoes. The extent of the retraction of the shoes
is adjustable by the bottom adjusting nut and the
bottom locking nut and the speed of the retraction
being adjustable by the top adjusting nut, which
adjusts the tension of the concentric spring, (see 10
Fig. 1).
The suspension brackets (Figures 4, 5, 6, and 8)
are to be cut out from a sheet metal stock, shaped
and welded; that is the brace section is a separate
piece welded to the main section of the bracket. 15
The main section includes the base plate, the face
plate and the arm, IS.
The journal brackets (Fig. '7)
structed by use of one pattern
interchangeable with each other.
so the end of the brace section is
are to be con
to make them
They are made
rolled to hold a
bushing that holds the shaft, 1. The base plate
is curved to ?t the round lower portion of the
journal case and is welded to the face plate and
brace sections to form a complete bracket.
pairs of complete brackets are welded to the round
lower portion of the journal case as shown in
Fig. 8 (see Figs. 7 and 8).
I am aware that prior to my invention concen
tric springs, cam-levers, clevised rods have been .I
made and used in many types of apparatus and
that brake shoes have been made and used in
various multiple types of railway brake applica
tion equipment and that the principle of external
323 El
contraction has been used for braking before.
Therefore; I do not claim such, broadly; but,
I do claim:-—
In combination with a railway car truck
including a supporting wheel, a plurality of brack
ets carried by said truck and having parts ar 40
ranged to extend over the periphery of the wheel,
a plurality of brake shoes positioned about the
periphery of the wheel, links positioned between
the brake shoes and movably connected there
with, yielding means connected with said links
and said parts for normally holding the brake
shoes in spaced relation with the periphery of the
wheel, said means restraining the brake shoes
from lateral shifting, and an operating linkage
movably connected with two brake shoes for mov
ing all the shoes into braking relation with the
periphery of the wheel, said linkage extending
across one side of the wheel.
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