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Патент USA US2403585

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July 9, 1946-
G. E. DAQTH ET AL
‘2,403,585
DRAFT GEAR
Filed July 1'7, v1945
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Gear‘ge E’. ?at/Z
151714711 $0M)”
By M
2,403,585
Patented July 9, 1.946
_ UNITED STATES PATENTY’OFFICE
DRAFT GEAR
George E. Dath and‘Roland J. Olander, Chicago,
Ill., assignors to W.- H. Miner, Inc., Chicago, 11].,
a corporation of Delaware
Application July l7, 1943, Serial No. 495,092
7 Claims.
(Cl. 213—34)
2
1
This invention relates to improvements in draft
gears for railway cars.
One object of the invention is to provide a
railway draft gear, comprising a friction shock
absorbing mechanism, especially designed for ab‘
sorbing shocks produced by a pulling or draft
action applied to the coupler or drawbar of'a
frame structure has a transverse connecting
member I2 which extends between the two sills
from one to the other, and has its opposite ends
?xed thereto. The member vl2 serves as the front
stop of the draft rigging of the car and is reins
forced by a heavy plate I 3 on the inner side there
of, which is preferably welded thereto. ‘The end
sill l0 and the member l2 are of channel-shaped
I
cross section and are connected by top and bot!
A more speci?c object of the invention is to
provide a draft rigging for railway cars com 10 tom plates l4 and M, which are secured to the
top and bottom ?anges of said channel members.
prising a drawbar and a friction shock absorb
The drawbar of the car, which is indicated by _| 5,
ing mechanism, especially designed to cushion the
is of the type having a coupling hook at the outer
pulling shocks transmitted by the drawbar,
end thereof for engagement with the coupling
wherein the friction shock absorbing mechanism
includes a friction casing, friction shoes slidable 15 means of an adjacent car. The drawbar l5 has
an enlarged head 16 at the outer end having the
within the casing, a central wedge spreading
hook formed. thereon. The shank ll of the draw
member cooperating with the shoes, and spring
railway car.
resistance means within the casing opposing in
bar, 15, which extends rearwardly from the head,
bined spring and frictional resistance to provide
shank [1, thereby providing top and bottom
is of cylindrical cross section, that is, in the form
ward movement of the shoes, and wherein the
friction shock absorbing mechanism is actuated 20 of a cylindrical bar or shaft. The usual nut I8
is threaded on the rear end of the shank I1. The
in draft by the drawbar which extends through
drawbar I5 is accommodated for lengthwise slid
the casing and has shouldered engagement with
ing movement in aligned openings [9 and 20 in
the wedge to force the latter inwardly of the
the end sill l0 and connecting member l2-l3.
casing, thereby spreading the shoes apart and
The head l6 of the drawbar is reduced in size-at
moving the same inwardly of the casing opposed
the rear end thereof where it joins the cylindrical
by the spring resistance, thus providing high com
shoulders 2 l—-2l adapted to engage the front face
of the end sill l0 and limit inward movement of
Other objects of the invention will more clearly
appear from the description and claims herein 30 the drawbar.
Our improvements, as shown in the drawing,
after-following.
,
comprise broadly a friction casing -A, a wedge
. In the drawing forming a part of this speci?ca
block B, three friction shoes C—C-—C, and a
tion, Figure 1 is a longitudinal sectional view,
spring resistance D.
.
,
through the underframe structure of a railway
As shown in Figure 1, the friction unit com
car, at'one end thereof, illustrating our improve 35
prising the casing A, block B, shoes c-o_c, and
ments in connection therewith. Figure 2 is an
spring D, is disposed between the draft or center
end, elevational view, on an enlarged scale, of the
the desired cushioning action.
,
sills of the car in abutment with the front stop
l2-l3. The shank I‘! of the drawbar 15 extends
of the car being omitted. Figure 3 is a vertical 40 through the unit and actuates the same in draft
~
sectional view, corresponding substantially to the ‘ action, as hereinafter pointed out. I
The friction casing A is in the form of a shell
line »3--3 of Figure 2. Figure 4 is a view, similar
of hexagonal transverse cross section, open at one
to Figure 2, illustrating the manner of assembling
end, and closed at the other end by a transverse
the parts of the friction shock absorbing unit.
structure shown in Figure 1, looking from right
to left in said ?gure, the underframe structure
Figure 5 is a view, similar to Figure 3, but taken 45 wall 22. As shown in Figure 1, the closed end of
the casing A bears on the front stop '|2-—l3 of
on the line 5-5 of Figure 2, illustrating the man
the underframe of the car. The open end of the
ner of assembling the parts of the friction shock
casing is thus presented at the rear or inner end
absorbing unit.
of the draft rigging. The side walls of the casing.
In said drawing, [0 indicates the usual end
sill of the carvunderframe structure, and II one 50 which are indicated by 23~—23, are thickened at
the open end of the casing, as indicated at 24,
of the center sills. As will be understood by those
and present six ?at interior friction surfaces
skilled in this art, the usual underframe structure
25—25 which converge inwardly of the casing,
comprises two spaced center sills and these are
thereby providing a tapered friction shell portion
?xed at their front ends to the end sill. Rear
26 at the open end of the casing. vAt the open
wardly or inwardly of the end sill, the under
2,403,585
3
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,9;
4
end, the hexagonal casing is provided with three
inturned stop lugs 21—21-21, the'lugs being
and shouldered against the bottom of said seat.
The nut i8 is preferably secured against accl
dental removal by a cotter pin 42 extending
through the end of the drawbar shank.
In assembling the mechanism, the parts are all
located at alternate corners of the same. Spaced
inwardly from the stop lugs 21-21--21 and in
longitudinal alignment therewith are three in
terior stop shoulders 2B—28—28, which serve to
placed within the casing A by being inserted
limit inward, movement of thefwedge block B, as
throughthe open end thereof, the springs 39 and
hereinafterpointefd'out.
‘
"
‘
'
'
’
'
The wedge B is in the form of a block centrally
recessed at the outer end, as indicated at 29, to‘ 10
provide a seat for the nut N3 of the coupler“
shank l1. At the sides thereof, the wedge‘ isv "
provided with three projectingwedge faces 30
of substantially V-shaped transvers'ehrosssection.
The wedge faces 30 are disposed symmetrically. 15
about the central longitudinal axis of the mech
anism and converge inwardly'of the. casing to;
ward said axis.
The block B is also provided _
with three radially projecting lugs 3I—3l-—3!
which are alternated with the _\_!-shaped wedge
faces ‘thereof. Thejlugs' 3I—3|—3I are located
at the inner end of the wedge block and in the
‘assembled condition of the mechanism are in
20
ddbeidg?rst placed‘iin position "therein. The
shoes C—C--C are then placed on the spring 40
and forced inwardly to a predetermined extent,
so that when the wedge B is placed thereon and
turned to the position shown in Figure 4, the lugs
3|--3_|—3l thereof will clear and pass inwardly
beyondthelugs 21—21—~21 of the casing when
the Wedge. is pushed inwardly. The wedge is then
placed in position on the inner spring and shoes,
2. spanner, or similar tool, ‘being engaged within
the opening 33 of said wedge block B and notches
34—34 of said opening to hold the block against
rotation. Whilethe shoes, are being held in said
predetermined inward position, “the wedge is
forcedinwardly and given a slight turn in contra;
clockwise direction, as viewed in Figure 4, to bring
the lugs 3! in alignment with the lugs 21 and in
stops of the casing formed by the lugs 21 "and 25 back of the latter, as shownin Figure 2, and the
‘shoulders 28, and are engaged therebetween so
pressure is then removed, permitting the mech
that inward movement of the wedge, is'limited
anism to expand and assume the position shown
by engagement of the lugs 3| with the shoulders
in Figure 3 with the lugs 3| of the wedge block
28 and outward movement by engagement with
engagedlwith the lugs 21 of the casing. Outward
the lugs 21. At the inner end, the block B is 30 movement of the Wedge is thus limited by, the
provided with a substantially flat transverse ‘end
lugs 21, the latter serving to hold the mechanism
‘face 32 which forms a spring seat. The block B
assembled. As vwill be evident, the interengaging
has a central opening 33 therethrough adapted
arrangement of the V-shaped wedge faces of the
to accommodate the shank I1 of the drawbar H5.
wedge and shoes and V-shaped friction surfaces
'The walls of the opening are notched at diametri“ 35 of the shoes and. casing interlock the parts
cally' oppositesides of the opening, as indicated
against, relative rotation, thus preventing acci
at 34, 'to cooperate with a spanner, or similar
dental rotary displacement of the wedge from
tool,- used in assembling the mechanism.
cooperative relation with the retaining lugs 21 of
"The friction shoes ,0, which are three in num
the casing.
her, are of substantially V-shaped cross section, 40 In the operation of the mechanism when a
each shoe presenting a V-shaped wedge face 35
pulling force is applied to the drawbar, the wedge
at the inner side thereof and a V -shaped friction
B will be pulled inwardly of the casing ‘in unison
longitudinal alignment with, the corresponding
surface 36 at the outer side. The friction shoes
with the drawbar, thereby forcing the wedge in
C—C'—C are alternated with the lugs 21-21--21
wardly of thecasing against the resistance of
the spring 39. Due to wedging engagement be
of the casing and have the V-shaped‘friction
surfaces thereof slidably engaged with the corre
sponding friction surfaces of thecasing', the V
shaped surface of each shoe engaging two adja
cent surfaces 25—25 of the casing. The V-shaped
wedge faces 35—35—35 of the shoes cooperate
with the V-shaped wedge faces 30—3G-—39 of the
tween the wedge and‘ shoes,‘the shoes are forced
apart against the friction surfaces of the casing
and carried inwardly along' said friction surfaces
resisted by the spring 40. 'I‘he‘resultant com
bined spring and frictional resistance‘ produced
by this action provides the‘ desired high shock ab_
wedge block ‘13-. The wedge faces 35—35—35 of
sorbing vcapacity. ' Compression of the 'mech
the shoes are formed on lateral inward enlarge‘
anism is positively limited'by engagement of’the
ments 31 on the shoes, the enlargement 31'of each
lugsv 3| of the block B with the stop shoulders of
‘shoe presenting a flat face 38 at the inner end 55 the casing A, thus preventing the wedge B from
thereof forming a ‘spring seat.
‘
" The springresista‘nce lltvhi'chv is preferably
under initial compression, is disposed within the
casing A and comprises a relatively light inner
coil 39 and a, heavier outer coil 4%}. The opposite
ends of the outer‘ coil lit bear respectively on
the inner side of the end wall 22 of the casing
and the spring seats 38 of the shoes C, and the
opposite ends'of' the inner "coil bear, respectively,
being drawn too far into the casing by the draw-v
bar and protecting the springs against undue
compression.
When the actuating force is're
duced, the springs 39 ‘and 40 restore all of the
parts to normal position, outward‘ movement of
the wedge being limited by engagement of the
111853! thereof with the stop lugs 21 of the casing.
, We have herein ‘shown and described what we
now consider the'preferred manner of carrying
:o'n-is'aid wall 22 and the ?at end face 32 of the 65 out our invention, but the same is merely illus
wedge block B.
‘
'
"
trative and we contemplate all changes and modi
V As clearly shown in Figures 1 and 2, the shank
?cations that come within the scope of the claims
11 of the drawbar extends through the casing A
appended hereto.
_
'
of the mechanism, the wall 22 of the casingibeing
provided with a central opening 4| ther'ethroug‘h
to accommodate the shank of the drawbar. The
=‘drawbar shank extends through the opening lll,
the inner coil 39 of the spring, and the opening 33
-'of the wedge block B, and is anchored to‘the
latter by the nut I 8 accommodated in the seat 29
1. In a railway draft rigging for a railway car
having a front stop, the combination with a fric
tion casing having one end closed and the other
‘end open, said closed end bearing on the front
stop of the car; of friction shoes having sliding
engagement with the interior walls of said casing;
2,493,585
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spring means opposing inward movement of said
shoes; a block having wedging engagement with
the shoes; spaced inner and outer stops on the
casing; projecting stop lugs on said block en
6
tion casing open at one end, the other end of
said casing being engageable with said stop, said
casing having longitudinally extending, interior
friction surfaces at said open end; of a central
wedge block, a drawbar for actuating said wedge;
gageable with said inner and outer stops for limit
a plurality of friction shoes having sliding fric
ing inward and outward movement of said wedge
tional engagement with the friction surfaces of
block; and a drawbar extending through said cas~
the casing and wedging engagement with said
ing, spring means, and block and having shoul
wedge
block; spring resistance means yieldingly
dered engagement with the latter to pull the same
opposing inward movement of said wedge and
10
inwardly of the casing in draft.
shoes; and inner stop means on said casing with
2. In a railway draft rigging for a railway car
which the wedge block is directly engageable to
having a front stop, the combination with a fric
limit inward movement of the latter.
tion casing open at one end and closed at the
5. In a railway draft rigging, the combination
other end, said last named end bearing on‘ said
with a front stop; of a drawbar; a friction casing
front stop of the car; of friction shoes having
engageable with said front stop, said casing hav
sliding engagement with the interior walls of said
casing; a Wedge block having wedging engage
ment with the shoes; spaced inner and outer stops
on the inside of the casing engageable with said
wedge block limiting inward and outward move
ment of said wedge block; a spring resistance
within said casing comprising two coils respec
tively opposing inward movement of said wedge
block and shoes; and a drawbar extending
through said casing and wedge block and having
shouldered engagement with the latter to pull the
same inwardly of the casing in draft.
3. In a railway draft rigging for a railway car
having a front stop, the combination with a fric
inwardly converging, interior friction sur
faces; a friction clutch actuated by said drawbar
having sliding frictional engagement with the
friction surfaces of the casing, said clutch in
cluding friction shoes and a central wedge block;
interior stop shoulders on said casing with which
said block has direct shouldered engagement to
limit inward movement thereof; and spring means
within the casing yieldingly opposing inward ‘4";
movement of said clutch.
> 6. In a railway draft rigging, the combination
with a front stop; of a drawbar; a friction casing
engageahle with said front stop, said casing hav
inwardly converging, interior friction sur
tion casin g open at one end and closed at ‘the ad
1 l
faces; a friction clutch actuated by said draw
other, said casing having longitudinally disposed,
and having sliding frictional engagement with
inwardly converging, interior friction surfaces at
the friction surfaces of the casing, said clutch
said open end, said casing having the closed end
including friction shoes and a central wedge
there-of abutting said front stop; of a drawbar
block; interior stop shoulders on the casing;
having an elongated shank extending through
outstanding lugs on said wedge block engageable
said front stop and easing; friction shoes within
with said stop shoulders for limiting inward
the casing having friction surfaces of V-shaped,
movement of the wedge block; and spring means
transverse cross section engaged with the V
yieldingly opposing inward movement of said
shaped friction surfaces of the casing; a central
wedge block mounted on said drawbar shank and 40 clutch.
'7. In a railway draft rigging, the combination
having wedging engagement with the shoes, said
with a front stop; of a drawbar; a friction casing
shoes and block having interengaging wedge faces
having inwardly converging, interior friction sur
of V-shaped, transverse cross section; inner and
faces; a friction clutch actuated by said drawbar
outer stops on the interior of the casing; laterally
projecting lugs on said wedge block engageable 45 and having sliding frictional engagement with
the friction surfaces of the casing, said clutch
with said inner and outer stops for limiting in
including friction shoes and a central wedge
ward and outward movement of said block; means
block; radial stop lugs on said wedge block; in
on said drawbar shank having shouldered en
terior stop shoulders on the casing with which
gagement with the wedge block for forcing the
said lugs are engageable for limiting inward
same inwardly of the casing when a draft force
movement of the wedge block; and spring means
is applied to said drawbar; and spring means
yieldingly opposing inward movement of said
within the casing surrounding said drawbar shank
and yieldingly opposing inward movement of said
shoes and wedge block.
4. In a railway draft rigging for a railway car
having a front stop, the combination with a fric
clutch.
GEORGE E. DA'I‘I-I.
ROLAND J. OLANDER.
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