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Jan. 14, 1947.
G. E. DA1-H
FRICTION SHOCK ABSORBING MECHANISM
Filed July 16,' 1943
. 2,414,222
2
Patented Jan. 14, 1947
UNITED STATES PATENTA OFFICE
2,414,222
FRICTIONl SHOCK ABSORBING
MECHANISM
George E. Bath, Chicago, Ill., assigner to W. H.
Miner, Inc., Chicago, Ill., a corporation of Dela
Application `îuly 16, 1943, Serial N o. 494,925
1
4 Claims.
This invention relates to improvements in fric
tion shock absorbing mechanisms.
One object of the invention is to provide a fric~
tion shock absorbing mechanism, especially
adapted for railway draft riggings, comprising a
friction casing having an inwardly tapered fric
(Cl. 213-34)
2
The casing A is of substantially hexagonal in
terior and exterior cross section, having the fric
tion shell section at the forward end, which is
open, and the spring cage section at the rear end
thereof. The casing A is closed at the rear end
by a transverse vertical wall iii which projects at
opposite sides beyond the side walls of the cas
ing to provide a rear follower member of rectan
tion shell section; a friction clutch including a
central wedge; a plurality of wedge blocks sur
rounding the central wedge. and a plurality of
friction shoes interposed between the walls of 10 gular outline, which is integral with the casing.
The follower member and casing are reinforced
the tapered friction shell section of the casing
by webs ll-H formed integral with the follower
and the wedge blocks; and a spring resistance
member and the casing side walls, The friction
opposing inward movement of the clutch, where
shell section of the casing is provided with six
in the wedge blocks have wedging engagement
with both the central wedge and the friction ^ interior, substantially fiat friction surfaces
i2--l 2 which converge inwardly of the casing and
shoes to provide for differential action, whereby
are spaced symmetrically about the central lon
the shock absorbing capacity of the mechanism
gitudinal axis of the mechanism. The interior
is materially increased.
of the friction shell section thus presents six
Another obiect of the invention is to provide
interior friction surfaces, adjacent surfaces oi’
a friction shock absorbing mechanism compris
which are angularly disposed with reference to
ing a friction casing, a friction clutch within the
each other, thereby providing three pairs of sur»
casing, and spring resistance means within the
faces, the adjacent members of each pair to«
casing yieldingly opposing inward movement of
gether forming a friction face of V-shaped trans
the clutch, wherein the casing is open at one end
verse cross section.
only and the parts are insertable ._irough said
At the open end, the casing is provided with
open end in assembling the mechanism, and are
a continuous inturned circular retaining flange
held assembled by shouldered engagement be
l 3 which overhangs the opening and forms limit
tween certain members of the clutch and the fric~
ing stop means for the wedge blocks O_O-C.
tion casing, thereby dispensing with the usual re~
'I‘he combined spring follower and central
tainer bolt commonly employed to hold the parts
wedge B comprises a relatively heavy circular
of a friction shock absorbing mechanism assem
plate or disc Irl having a forwardly projecting
bled.
central post thereon forming the central wedge
Other objects of the invention will more clearly
i5 of the mechanism. The wedge i5 is inwardly
appear from the description and claims hereinn
tapered and is in the form of the frustrum of
after following.
\
a cone, The taper of the wedge or post l5 is
In the drawing forming a part of this specifica
relatively slight so that the same presents a wedge
tion, Figure 1 is a front elevational view of a fric
face it of relatively keen angularity with respect
tion shock absorbing mechanism embodying my
to the central longitudinal axis of the mechanism.
improvements. Figure 2 is a horizontal sectional
The wedge blocks C, which are preferably three
View, corresponding substantially to the line 2_2
of Figure 1. Figure 3 is a transverse vertical sec 40 in number, are of similar design. The three
blocks C---C~-C surround the post or wedge l5, as
tional view, corresponding substantially to the
clearly shown in Figures l and 2, and project outw
line 3_3 of Figure 2. Figure 4 is a view, similar
wardly of the casing. Each block C has an arc
to Figure 2, illustrating the manner of assembling
the mechanism, the rear end of the casing being
broken away. Figure 5 is a front elevational view
of Figure 4, looking from left to right in said last
named figure.
~
As shown in> said drawing, my improved fric
tion shock absorbing mechanism comprises
broadly a casing A providing a combined friction
shell and spring cage; a combined spring follower
Àand central wedge B; three wedge blocks
O_O-C; three friction shoes D-D-D; and a
spring resistance E.
55
shaped, laterally projecting flange ll on the outerside thereof, between its ends, which engages in
back of the flange il? of the casing to limit out~
ward movement of the block. On the inner side,
each block C is provided with
transversely
curved wedge face l5, correspondingly inclined
to and fitting the wedge face lâ of the _wedge i5.
0n the outer side, inwardly of the iiange il, each
block C is provided with a substantially dat wedge
of
facethei9 mechanism
which is inclined
at a greater
to the longitudinal
angle than the
wedge face i6 of the wedge I5. At the front
2,414,222
4
/
.
turns the parts to the normal full release posi
tion shown in Figure 2, outward movement of
the wedge blocks C--C-C being limited by shoul
dered engagement with the flange I3 of the
casing.
ends, the blocks C-C-C are provided with flat
abutment faces 20 adapted to be engaged by the
usual front follower of the draft rigging of the
railway car.
The friction shoes D, which are three in num
I have herein shown and described what I now
consider the preferred manner of carrying out
my invention, but the same is merely illustrative
ber, are interposed between the blocks C-C-C
and the interior friction surfaces I2 of the cas
ing. Each shoe has a friction surface 2l on the
outer side thereof of V-shaped transverse cross
and I contemplate all changes and modifications
that come within the scope of the claims ap
section, which cooperates with the corresponding 10
pended hereto.
V-shaped friction face of the casing formed by
I claim:
two adjacent surfaces I2-I2 of said casing. At
1. In a friction shock absorbing mechanism,
the inner side, that is, the side nearest the cen
tral axis of the mechanism, each shoe has a flat
wedge face 22 cooperating with and correspond
15
ingly inclined to the wedge face I9 of the corre
sponding wedge block C. At the rear ends, the
shoes have flat transverse end faces 23 bearing
the combination with a friction casing open at
one end and having an interior stop shoulder
at said open end; of a friction clutch comprising
`a plurality of wedge blocks, friction shoes sur
rounding said wedge blocks, and a spreading
member between said wedge blocks, said wedge
' on the forward side of the spring follower disc I4
blocks being arranged symmetrically around the
20
0f the member B.
central longitudinal axis of the mechanism, said
The spring resistance E comprises a relatively
blocks- having lateral projections engaging the
light inner coil and a heavier outer coil inter
shoulder of the easing to limit outward movement
posed between the follower disc Iii of the member
B and the rear wall Iâ] of the casing A.
The
of said blocks, said friction shoes having sliding
engagement with the interior walls of the cas
spring resistance is preferably under initial com 25 ing and wedging engagement with said wedge
pression in the assembled condition of the parts.
blocks, said spreading member comprising an
In assembling the mechanism, the spring re
inwardly tapered stem having >wedging engage
sistance E, the combined wedge and spring fol
ment with the wedge blocks to hold the same
lower B, and the shoes D-D-D are first placed
spread >apart with the lugs thereof in shouldered
within the casing A by inserting these parts 30 engagement with the stop shoulder of the casing,
through the open front end of the casing. With
said wedge blocks being insertable through the
the casing A standing on end, the combined
open front end of the casing when said spreading
wedge and spring follower B is forced inwardly
member is displaced inwardly to clear said blocks;
by a cylindrical barlike tool 24 engaging the outer
and spring means opposing inward movement
end of the post I5 of said member B. As the 35
of said clutch.
^
’ member B is forced inwardly, the shoes D-D-D,
2. In a friction shock absorbing mechanism,
which are resting on the follower disc Id will move
the combination with an inwardly tapered fric
inwardly therewith. When the parts have been
tion casing .open at one end and closed at the
displaced inwardly of the casing, approximately
other end, said casing having an inturned stop
to the position shown in Figure 4, the three wedge 40 flange at said open end; of three friction shoes
blocks C--C-C are entered through the open
having sliding frictional engagement with the
end of the casing and arranged around the bar
interior of said casing; three wedge blocks hav
24, as shown, with the flanges I'I-I'I-I'I dis
ing wedging engagement with said shoes, respec
posed inwardly of the flange I3 of the casing.
tively, each of said wedge blocks having a later
The wedge blocks C-C-C are then spread
ally projecting ñange engageable in back of the
apart to bring the flanges I'l thereof under the
flange of the casing to limit outward movement
flange I3 of the casing, and the tool 24 is with
of said block; an inwardly tapered spreading
drawn, permitting the parts to assume the posi
member engaged between said wedge .blocks to
tion shown in Figure 2, with the post I5 of the
hold said wedge blocks spread- apart with the
member B engaged between the wedge blocks 50 flanges thereof in position to engage said flanges
C-C--C.
of the casing; means on said spreading member
The operation of my improved shock absorbing
engageable with the inner ends of the shoes for
mechanism is as follows: Upon inward movement
limiting outward movement of the spreading
of the wedge blocks C-C-C with respect to the
member with respect to said shoes; and spring
casing A being produced due to compression of
means yieldingly resisting inward movement of
the mechanism, the spring resisted friction shoes
the spreading member and shoes.
D-D-D are wedged apart and carried inwardly
3. In a friction shock absorbing mechanism,
of the mechanism against the resistance of the
the combination with an inwardly tapered fric
spring E. Due to the taper of the casing, the
tion casing open at one end and having an
shoes will be displaced inwardly toward the cen
inturned stop flange at said open end; of three
tral axis of the mechanism during said inward
friction shoes having sliding frictional engage
movement along the friction surfaces of the
ment
with the interior of said casing; three wedge
casing, thereby causing a differential action be
blocks having wedging engagement with said
tween the wedge blocks C-C-C and the shoes
shoes, lrespectively, each of said wedge blocks
D-D-D, whereby the shoes are advanced in
having a laterally projecting flange engageable
wardly more rapidly than the blocks C-C-C
in back of the flange of the casing to limit out
and the central wedge B is pulled inwardly with
.f ward movement of said block; a spring follower
respect to the blocks C-C--C, spreading the lat
bearing on the inner ends of said shoes, said
ter apart, thus increasing the inward differential
spring follower having a central wedgeV pro
movementJ of the shoes. As will be evident, the
jection rigid therewith engaged between said
compound differential action provided materially
increases the shock absorbing capacity of the
mechanism.
Upon the actuating force being reduced, the
expansive action of the spring resistance E re
wedge blocks, said projection and blocks having
cooperating wedge faces, said wedge projectionl .
holding said blocks spread apart in position to
75 engage said flanges of the casing; and spring
2,414,222
means yieldingly resisting inward movement of
said spring follower.
`
4. In a friction shock absorbing mechanism,
the combination with a friction casing open at its
front en`d and closed at its rear end, said casing
having inwardly converging interior friction sur
faces at said open end; of a central rearwardly
tion surfaces of the casing and having fiat trans
verse rear end faces bearing on said spring fol
lower; three friction blocks interposed between
the shoes and post, said shoes and blocks having
interengaging fiat wedge faces, said blocks having
transversely curved wedge faces engaging the
surface of said post; and a spring resistance with~
tapered wedge post of frusto-conical shape hav
in the casing yieldingly opposing inward Inove
ing an integral flat spring follower plate at the
rear end thereof rigid therewith; three friction 10- >ment of the spring follower.
shoes having frictional engagement with the flric
GEORGE E. DATI-I.
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