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Патент USA US2411956

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Dec.` 3, £946.
G. E. DATH
FRICTION SHOCK ABSORBING MECHANISM
Filed June 6, 1945
2,411,956k
, Patented Dec. 3, 1946`
2,411,956 Í
UNITED STATES PATENr ortica
FRICTION SHOCK ABSORBING MECHANISM
George E. Dath, Mokena, Ill., assignor to W. H.
Miner, Inc., Chicago, Ill., a corporation of Dela
Ware
1
Application June s, 1945, serial No. 597,811
>5 claims. (cl. 267-9)
This invention relates to improvements in fric
tion shock absorbing mechanisms. '
¿_
One object of the invention is to provide a
friction shock absorbing mechanism comprising
a friction casing and a spring resisted friction
clutch including a wedge block and friction shoes
central wedgefblockk and friction shoes surround
ing the block; spring means within the casing
yieldingly opposing inward movement of the
clutch; and a retaining means for the clutch in
cluding inturned lugs at the open end of the
casing with which the clutch has shouldered en
gagement, wherein the llugs are disposed at dia
telescoped within the casing for sliding frictional
engagement therewith, wherein one of the shoes
has shouldered engagement with the casing to
metrically opposite corners of the hexagonal cas
ing and are respectively engaged by the outer end
. limit outward movement of the sameA and the
of one »of said shoes and a lug on said wedge,
wedge has shouldered engagement with the ca_s
and wherein the wedge and said last named shoe
ing and said shoe to limit outward movement of
have shouldered engagement with each other forI
the wedge and hold the mechanism assembled.
anchoring the wedgeto said last named shoe,
A further object of the invention _is to provide
the lug of the wedge and the shoulder of the same
in a friction shock absorbing mechanism includ 15 being respectively engageable in back of the co
ing a 'friction casing of hexagonal, transverse
operating lug of the casing andthe shoulder 'of
cross section, open at its front end and closed by
the shoe by inserting the wedge Within the cas
a' permanent wall at >its rear end, a central wedge
ing while in tilted position. thus permitting the
block adapted to receive the actuating force; a
use of .lugs ion' the casing having minimum pra-4
plurality of friction shoes surrounding the wedge 20 jection into the opening of the same, thereby
block and having wedging engagement therewith;
making possible the use of the maximum diamand a spring resistance within the casing yield
eter spring which may be ‘accommodated in said
ingly opposing inward movement of the shoes,
hexagonal casing.v
`
A
all insertable within the casing through the open
Other objects of the invention will more clear
front end thereof, a, retaining arrangement for 25 ly appear from the description and claims here
-the wedge block, utilizing inturned lugs on the
inafter following.
_
casing at the open end thereof, whereby a pas
In the drawing forming a part of this speci
sage of ample size to admit themaximum diam
fication, Figure 1 is a longitudinal, vertical sec
eter spring which may be accommodated in the
tional view of -my improved friction shock absorb
hexagonal casing is provided between the lugs 30 ing mechanism, said view corresponding substan
of the casing, thereby making possible the use
tially to the line i-I of Figure 2. Figure 2 is ‘
of' a relatively heavy spring resistance with cor
a front elevational view 'of Figure 1. _Figure 3
respondingly increasedrshock absorbing capacity
is a view similar to Figure 1, partly broken away,
of the mechanism.'
l
with the friction casing setl on end, illustrating
A further object of the invention is to prcvide 35 the manner of assembling the wedge with the
.a friction shock absorbing mechanism including
casing and shoes, the wedge and shoes being
a friction casing open at one end, friction shoes
shown in dotted lines and the spring resistance
slidable within the open end of the casing, a
being omitted. Figure 4 is a front elevational
central wedge block in wedging engagement with
view of the friction shoe located at the upper side
the shoes, and spring resistance means yieldingly 40 of the casing, as seen in Figures 1 and 2 and look
ing from left to right in Figure 1.
opposing inward movement of the shoes, wherein
the wedge is limited in its outward movement
My improved friction shock absorbing mech- y
and anchored to the casing by providing shoul
anism. as shown, comprises broadly a casing A;
dered .engagement between the wedge and the
a wedge block B; three -friction shoes C, D, and
casing and between the wedge and one of the 45 E; and a spring resistance F.
shoes at diametrically opposite sides of the mech
The casing A is in the form of a hexagonal,
anism, and restricting outward movement of said
_tubular member closed at its rear end by a ver
last named shoe by shouldered engagement with
tical, transverse wall i0, which is extended lat
the casing.
' '
erally beyond the casing to provide the usual in
A more specific object of the invention isv to 50 tegral rear follower member. At the forward or
provide a friction shock absorbing mechanism
open end thereof, the casing A‘ has the walls
including a. friction casing of hexagonal, interior
thereof inwardly thickened to provide the fric
cross section, closed at one end and open at the
, other end; a friction clutch slidingly telescoped
tion shell section proper II of the casing. The
friction shell section of the casing presents three
' Within the openv end of the casing including a 55 ulterior friction surfaces lil-IZ-IZ which voon
4
3
While thus held by the tool, .the wedge block B
jis inserted Within the casing in the tilted posi
tion shown in Figure 3, the lug 20 of the wedge
block being brought in back of the lug Il of the
verge rearwardly of the mechanismv and are of*
V-shaped, transverse cross section. The casing
A is provided with diametrical, oppositely dis
posed,- inturned stop lugs I3 and Il at the open»
end thereof, which lugs arer at diametrically op Cil casing and the shoulder 22 in back of the lug I8
of the shoe C. The holding tool is then removed,
posite corners of the casing. The lug I3, as shown
permitting the spring resistance to expand and
in Figures 1 and 2, is located at the top side of
force the shoes C, D, and E outwardly,~thus right
the casing between the diverging sections of the
ing the wedge and interlocking the lug 20 thereof
top V-shaped friction surface I2. The lug I4,
with the lug I4 of the casing and the shoulder
as seen in Figures 1 and 2, is located at the bot
22 with the lug I8 of the shoe C and bringing the
tom side of the casing between the two adjacent
parts to the full release position of the mecha
V-shaped friction surfaces at said bottom side.
nism shown in Figure 1, with the shoe C-shoui
The friction shoes C, D, and E are of similar
dered against the lug I3 of the casing.
design, except as hereinafter pointed out. Each
shoe has a V-shaped friction surface I5 on the
outer side thereof which slidingly engages with
` The operation of my improved friction shock
absorbing mechanism is as follows: Upon com
the corresponding V-shaped friction surface l2
of the casing A. On the inner side, each shoe
pression of the mechanism, the >wedge block B is
forced inwardly of the casing, thereby spreading
the shoes apart and sliding'the same inwardly
along the friction surfaces of the casing, thus
producing high frictional resistance to absorb the>
shock. Upon'the actuating force being removed,
has a V-shaped wedge face I6 which is engaged
by the wedge block B. -The three shoes have 20
transverse, rear abutment faces I1-I‘I--I1 on
which the spring resistance ofthe mechanism
the lexpansive action of the spring resistance F
forces all of the parts outwardly, outward move
vided with a laterally inwardly projecting stop 25 ment of the wedge block B being limited by en
gagement of the lug 20 thereof with the lug ’Il
lug I8. As clearly shown in the drawing, vthe
of the casing and the shoulder 22 thereof with the
shoe C is considerably shorter than the shoes D
lug I8 of the shoe C, which shoe, in turn, has
and E> and shoulders at its front end against the
bears. At the forward end thereof, that is, for
wardly of the wedge face I6, the shoe C is pro
lug I3 of the casing.
its outward movement limited by engagement
.
The wedge B is in the form of a hollow block 30 with the lug vi3 of the casing.
having three inwardly converging, V-shaped
.
I claimt
v
.
o.
1. In a lfriction shock absorbing mechanism,
the combination with a friction casing; of a plu
wedge faces I9-I9--I9 at the inner end thereof,
which _are arranged symmetrically about the cen
rality of friction shoes slidable within the cas
trai longitudinal axis of the mechanism. At one
side thereof, the block B has a radial stop lug 35 ing, one of said shoes having shouldered en
gagement' with the casing to limit outward move
ment of said shoe; a spring resistance yieldingly
20 whichv engages in back of the lug Il of the
casing A. At the side thereof, diametrically op
posite to the lug 20,» the wedge block B _is out
opposing inward movement of said shoes; and a
central `wedge block having wedging engagement
outfor recessed, as indicated at 2|, said recess
being located at _thefront end of the wedge face 40 with said shoes, said vblock having shouldered
engagement with the casing and with the shoe
I3 at the corresponding side of the block- and
provides atransverse, forwardly facing abutment
which has shouldered engagement with the cas
„ shoulder 22 engageable in back of ‘th'e vlug I8 of
ing to >limit outward movement of the wedge with
the shoe C. The block B is preferably reenforced
respect to the casing and said shoe.
outwardly beyond the shoulder 22 by a length
2. In a’ friction shock absorbing mechanism, .
wise extending web or rib 23, which is tapered
ythe combination with a friction casing; of a plu
forwardly. The inner end of the web 23 over
rality of vfriction shoes slidable within the cas
hangs the recess 2| of the block. At the forwardV
ing; a spring resistance within the casing op
end, the ,wedge block B presents a fiat, transverse
posing inwardA movement of said shoes; and a.
face 24 which is adapted to bear on the usual
central wedge block having wedging engagement
front follower of the railway draft rigging,
with said shoes, said wedge block having ,shoul
The spring resistance F, which is disposed with
dered engagement with the casing and one of '
in the casing A, comprises a relatively light inner
coil 25 and a heavier outer coil 28. The spring
said shoes at diametrically opposite sides of the
mechanism to limit outward movement of the
coils 25 and 28 have their rear ends bearing on 55 wedge block, said last named shoe, in turn,` hav
the transverse end wall I0 of the casing A. The
ing shouldered engagement with the casing to
front ends of vthe spring coils 25 and 2B bear f
limit outward movement of said shoe.
respectively on the inner end of tge/uédge block
3. In a friction shock absorbing mechanism,
B and the inner ends of-thersho'es C, D, and E.
In the assembled condition of the mechanism, fthe
the combination with a‘friction casing of hex
.spring resistance F is preferably under initial
end and presenting three inwardly extending
compression.
In assembling theimechanism, the friction cas-r
friction surfaces of V-shaped, transverse cross
section at said open end; of three friction shoes
agonal, transverse cross section, open at one
Ving is set on end, that is, in upright position, as
having V-shaped friction surfaces respectivelyI
- shown in Figure 3, and the spring resistance F
engaging the V-shaped friction surfaces of the
and the three shoes C, D, and E placed vwithin
the casing with the shoes resting upon the springv
resistance in spread apart condition, the shoe C
being disposed in back of the lug I3 of the casing
A.
The shoes are then forced inwardly to ap
proximately the dotted line position shown in
» casing, one of said shoes having shouldered en
70 block having shouldered engagement with the
Figure 3 by means of any suitable tool engaged o
with the front ends of the shoes, and held in that
position during further assembling 0f the mech
gagement with the casing to limit outward move
ment of said shoe; a spring opposing inward
movement of said shoes; and a central wedge
shoewhich has shouldered engagement with the
casing to limit outward movement of the block
with respect to said shoe, and shouldered en
.75 gagement with the casing to limit outward move
' _enligne 'o
the combination with a. friction casing of hex
~ ment of the wedge block with respect ‘tothe
casing, said shouldered engagement of the wedge
and said shoe with the casing being at diamet
rically opposite sides of the mechanism.
.4. In a friction shock absorbingmechanism,
the combination with a. friction casing ofV hex
agonal, transverse cross section open at one e'nd
agonal, transverse cross section, open at one end
and having three inwardlyl extending friction
surfaces' at said open end of V-shaped, trans-f
' verse cross section; of an inturned stop lug at
and having inwardly extending frictionfsurfaces
atsaid open end of V-shaped, transverse sec
I ~' tion; of three friction shoes siidingly 'telescoped 10
within the casing, said -shoes having -V-shaped
vfriction* surfaces' engaging with the V-shaped
friction surfaces of the casing;l a spring .within
the casing yieldingly opposing inward movement
'of said shoes; diametricaily opposed, inturned 15
flugs at the open end of said casing, one of said
shoes having its outward movement limited by `
shouldered engagement with one of said stop
.- lugs of the casing; a central wedge block hav
vone corner of the casing between two adjacent
- friction surfaces thereof; a second inturned stop
lug on said casing at the diametrically opposite
corner thereof; three friction shoes having ’V
shaped friction surfaces ‘respectively engaging
the corresponding friction surfaces> of the cas
ing, one of said shoes having shouldered engage
ment with said second named lug to limit out
ward movement of said shoe; a spring yielding
1y opposing inward movement of said shoes; a.
central wedge blocky having wedging engage
ment with said shoes, said block having shoul- '
dered engagement with the shoe which has'
shouldered engagement with said second named
ing shouldered engagement with the last named 20 lug to limit outward movement of the block with respect to said shoe; and a retaining projection
shoe to limit outward movement of the wedge
on said wedge block engageabie in back `of said
I. with respect to said shoe, said block having
iirst named lug to limit outward movement of
wedging engagement with each friction shoe;
the wedge block with respect to the casing.
and a stop lug on said wedge engageable in back
`§ of the other stop lug of the casing.
25
GEORGE E. DA'm.
5. In a friction shock absorbing mechanism,
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