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0ct.`15, 1946.
c. w. L_EGUILLON ET AL
` 2,409,502:
TRACK FOR SELF-LAYING TRACK TYPE VEHICLES
Filed Jun'e 22, 1943
l
Patented Oct. i5, 1946
2,409,502
UNITED STATES PATENT OFFICE
2,409,502 `
TRACK FOR SELF-LAYING TRACK TYPE
VEHICLES
`
Charles W. Leguillon and Alvin S. Krotz,‘Akron, '
Ohio, assignors to The B; F. Goodrich `Company, New York, N. Y., a corporation of New
York
Application June 22, 1943, serial No. 491,760
6 Claims.
(c1. 305-10)
1
2
This invention relates to track for self-laying
4track type vehicles, and more especially to track
blocks therefor.
Fig. 3 vis a sectional view thereof, taken on
line 3-3 of Fig. 2.
.
Inthe use of self-laying track typeV vehicles it
has been found that track blocks of metal could
be usedV to advantage on soft terrain but these
have not provided the desired traction on hard
pavements or the like.
of Fig. 2.
or other rubber-like material have been found to
provide greater traction on hard pavements and
`
,
`
Fig. 5 is a cross-sectional View taken on line
5_5 of Fig. 2, the driving sprockets and guiding
wheel being shown' in dot and dash lines.
Furthermore, their use
has been limited to slow vehicle speeds. Track
blocks having tread surfaces of resilient rubber
'
Fig. 4 is a sectional view taken on line 4--4
Fig. 6 is a tread `face View of a modified form
of the invention, parts being broken away.
le»
Fig. 7 is a cross-,sectional view thereof taken
on line 1--1 of Fig. 6.
Fig. 8 is a sectional View thereof, taken on
the like, and to provide more quiet operation at
higher speeds with less damage to the pavement.
vline 8-8 of Fig. 6, parts being broken away.
Fig. 9 is a sectional View thereof taken on line
Such blocks as constructed heretofore, however, 15 9-,9 of Fig. 6, `parts being broken away.
have been found to suffer rapid deterioration due
to cracking and spalling of the resilient compo
Fig. l0 is a sectional view taken on line lß-ID
of Fig. 6, parts being broken away. ‘
sition "especiallywhere it‘ has been attempted to
employ synthetic rubber or rubber-like composi
In accordance with the invention a track is
formed of track blocks hinged to each other and
tions for the resilient face of the block. Fur 20 provided with a retaining wall whîch‘surrounds a
thermore, the useV of» tracks having resilient
body of resilient cushioning material such as
treads has been confined to light vehicles due to
rubber having a high tractive coefficient. The
tendency >of the resilient material to spread and
enclosed resilient material may Contact either
separate under heavy pressure.
with the ground to provide cushioning and trac
The present invention aims to overcome these 25 tion or with thev bogie wheels which support the
and other difficulties.
A `
Vehicle `to provideicushioning, or with'both, and
The principal objects .of the'present invention
in the preferred form of the invention, the resil
are to provide a composite track block structure
ient material extends continuously through the
having good traction properties on hard pave
track block from the tread face to the bogie
ment or soft terrain, `toprovi‘de for retaining` the 30 wheel contacting face thereof so that the vehicle
resilient material and preventing excessive spread- ‘
_is supported on a column of rubber from the
ing and cracking or spalling thereof, to provide
tread face of the track. The hinge pins are pref
high mechanical strength with adequate resil
erably provided with resilient torsion bushings
ient cushioning,_ to` provide cushioning of j the
extending through the track blocks and provid
bogie wheels, toprovide a resilient support di 35 ing for fleXure ofthe track without sliding fric
rectly from the'bogie wheels tothe ground, to‘
tion and for cushioning of the track longitudi
provide for' interlockingl of Vthe resilient rubber
like material with the metal without requiring
bondingfto provide a construction in which the
nally.
`
Referring to the drawing, and first to Figs. 1'to
5 thereof, the track I0 is trainedabout a driving
resilient rubber-likematerial may be moldedwith 40 wheel il having sprocket teeth l2, a guiding
a `minimum of mold equipment-to provide for
vwheel I3', and load supporting bogie wheels I4, `| 5,
torsional cushioning of the hinge pins, toV facili
i6, l1. The track comprises a series> oftrack
tate assembly and disassembly of the'track, to
`blocks-H3 pivotally connected to each other by
provide simplicity of construction, and to pro
thingie pins I9.`
vide for convenience of manufacture.
'
-
These and other objects ywill appear from the
following description and thev accompanying
drawing.`
i
,
‘
Of the drawing,
`
Each track block has a tread face 25 for engag
,
.
.
`ing the ground; and an oppos1te Wheel-engaging
face 26. Acentral area of the track block is sur
rounded by substantially vertical walls 21, 28, 29,
;
y
45V
i
3l)v of metal which .are joined to each other at
Fig. 1 is a side elevation of a track constructed 50 their ends and extend substantially normal to
in accordance with and embodying the invention,
the tread face of the block from the tread face
and showing driving, guiding and bogie wheels
to the wheel-engaging face to deñne a boX-like
of a vehicle, parts being broken away.
‘
Fig. 2 is a‘tread surface View of a` portion of
the track of Fig.v 1.
'
structure. A web 3l extends parallel to the tread
face between the vertical walls to which it is se
55 rcuredfand divides the central enclosed area to
2,409,502
3
provide a cavity 32 open at the tread face and a
cavity 33 open at the wheel-engaging face for re
4
therein for holding the filling in place. Alter
natively, or in addition to the projections and
grooves, the filling may be adhered to the metal
as by a bond resulting from vulcanization and for
this purpose the metal parts may be electroplated
a plurality of ears 35, 36, 31 are provided at one
with brass and the rubber vulcanized thereto.
end of each block extending longitudinally from
The arrangement is such that the enclosing
the wall 29 in spaced-apart relation, and the Wall
walls of metal protect the resilient ñlling material
3E) of the block is formed with a pair of knuckles
from spreading excessively under heavy loads
40, «il for engaging between the ears in inter
calated relation. The knuckles lill, 4I are formed 10 and from cracking and splitting or spalling at the
margins under such loads while the metal enclos
with aligned apertures for receiving torsion
ing walls will wear away at least as fast as the
bushings 42, 43, and the ears 35, 36, 31 `are formed
filling in use so that the ñlling is always avail
with cross apertures of smallerbore in alignment
able at the tread surface for providing increased
with the apertures of the knuckles for receiving
traction. The preventing of cracking and spall
a hinge pin 44.
ing is of especial advantage where the filling is
The bushings a2, 43 each comprise an inner
of vulcanized synthetic rubber or rubber-like
sleeve ¿l5 of metal flattened along one side, as at
materials not having great resistance to such
46, a bushing ¿l1 of soft vulcanized rubber or sim
ceiving resilient material.
For connecting the track blocks to each other,
ilar-rubber-like material thereabout and prefer
splitting and spalling action.
under radial compression. The hinge pin 44 is
surrounding metal walls at such surface, and
this ñlling may be similarly retained by projec
For cushioning the track from the bogie
ably bonded thereto, as by vulcanization, and a 20
wheels, an additional filling of similar resilient
split outer bushing ¿9 of metal bonded to the
material, such as soft vulcanized rubber or other
rubber-like material. The outer bushing 49 is
rubber-like material may be provided in the cav
preferably of semi-cylindrical bushing sections
ity 33 at the wheel-engaging face of the block
119cv, 49h. The bushings are forced into the aper
and extending at least as high as the edges of the
tures of the knuckles with the resilient bushing
formed with a flat 5B along one side throughout
tions, grooves, or bonding.
its length to prevent its turning with relation to
If desired for operation only on soft ground
the inner sleeves «l5 of the torsion bushings
through which it slidably extends. The ends of 30 the nlling of the cavity 32 may be omitted and
the hinge pin are secured to the ears 35, 31 as by
the walls 21, 28, 29, and 30 will act as grousers
taper pins 5I, 52 passing through the ears and
while the resilient filling of the recess 33 will pro
the pin, or by other suitable fastening means.
vide quiet operation and cushioning of the bogie
The arrangement is such that when one block is
wheels. Conversely, the cavity 32 may be ñlled
rotated about the hinge pin 44 of the adjacent
with resilient material for providing cushioning
block, the resilient bushing material is tensioned
of the track and increased traction and the ñll
by the torsional movement.
ing of the recess 33 may be omitted.
`
For driving the track, each block extends at the
Forproviding cushioned support of the bogie
sides of the box-like structure to provide wing
wheels directly from the road, the iilling of re
portions 60,' 6l which provide additional weight
silient material in the cavities 32 and 33 may
supporting areas effective to support the vehicle
be integral and continuous so as to provide a solid
on soft terrain but above the normal tread sur
column of rubber or other resilient material ex
face of the block, and these wings are provided
tending between the retaining walls 21, 28, 29,
with through apertures 32, 63 for engaging the
3l] from the tread face to the wheel-contacting
sprocketteeth of the driving wheel. Webs 64, 65 45 face. For this purpose the web 3l may in some
formed on the tread face ofthe wings act as
lcases be omitted entirely. It is preferred, how
braces and also provide traction in soft ground
ever, to retain'the web 3l adjacent the retain~
'into which they embed.
ing sidewalls for strengthening them and to pro
For guiding the track, upstanding guide lugs
vide apertures 15, 16 therethrough of considera
S6, B1 are formed integrally with the metallic Ul 0 ble size through which the filling extends. With
frame and project on the wheel-contacting face
this construction, the weight of the bogie wheels
of the block to engage over the sides of the guide
wheels.
To provide greater traction on hard pavement,
the tread face cavity 32 is filled at least flush with
the tread faces of the surrounding metal walls
with a resilient material having a high coeliicient
of friction with such pavement and preferably
with a body of soft vulcanized rubber or other
rubber-like material although a filling of ñbrous
_material in the form of woven cloth or cord
fabric with the cords exposed at the tread face
and arranged in vertically disposed laminations
will deform the resilient material and cause it to
bulge beyond the normal tread plane at the tread
face of the track whereby it will project beyond
the retaining walls and the bogie wheels will be
supported by resilient material directly from the
ground despite the presence of the metal walls at
the tread face.
Forproviding space for ñow of the resilient
material under pressure, the filling at the tread
surface may be formed with fiow cavities, such as
the chevron-shaped grooves 11.
`
In the modified form of the invention shown
in Figs. 6 to 10, the track is formed of track
adhered to each other by rubber or other plastic
material or unadhered and clamped in place, or 65 blocks each having a generally rectangular body
mixtures of rubber or other rubber-like material
defined by retaining Walls Iûû, IUI, |02, |03 nor
containing fibrous material, such as unwoven cot
mal to a face of the track and joined‘at their
ton ñbers may be employed. It is preferred,
corners to provide a box-like structure extend
however, to ñll the cavity with a vulcanized rub
ing from the tread face I 04 to the wheel-contact
ber or other rubber-like composition vulcanized 70 ing face |05 and providing a -space for a fill
in place and flush with the tread surface edges
ing |06 of resilient material such as vulcanized
of the retaining walls or projecting thereabove.
rubber or other rubber-like material, as in the
For retaining the resilient filling in place, the
1walls 21, 28, 29, 30 may have projections 10
form of the invention of Figs. 1 to 5.I A parti
tion lll1, parallel to the tread face,- extends be
formed thereon or reentrant grooves 1| formed 75 tween the retaining walls and may be formed
2,409,502
E
.
with aperturesèliiß, |09 therethroughto provide
continuity of the ñlling .as explained above.
Wings-illu, I vII are provided-at the sidesof the
block and apertures H2, >| I3. are formed there
through for engaging the sprocket teeth of a
driving wheel for driving the track.
For guiding the track, a pyramidal projection
VH5 .i is formed integral with the metal frame Vof
theV block' at its center for engaging between
guide wheels. The projection may conveniently
Vbe'formed on the partition Iül and extends
'through' the ‘resilient Vfilling above the wheel
engaging face of the track.
`
.
-
For hinging the track blocksto each other, one
end of each block is formed with a pair of knuckles
Sie, II'I‘formed from .the wall |63 andlhaving
aligned apertures of large bore for receiving tor
sion bushing structures, each comprising a re
silient torsion bushing |.IB or IIS of rubber or
other rubber-like material bonded to a shaft |20
extending through and beyond both bushings, and
Semi-cylindrical outer shell members |2I, |22
bonded about the resilient bushings. The bush
ings | i8, I I9 are spaced apart as are the knuckles
.
6
from the spirit; of the invention as it is defined
by the following claims.
-
‘
..
We claim:
1 1.’ A track block> for a self-'laying` track type
«vehicle in which a series of blocks are hingedly
connected; said block comprising a metal frame
.having retaining walls extending. substantially
toa face of the block, a partition spaced from said
face dividing the space betweensaid retaining
walls, said partition being apertured to provide
a communicating opening therebetween, and a
`filling of resilient material in said space and ex
tending between the tread >face and the wheel
contacting face of the block;
>
2. A track block for a self-laying track ‘type
vehicle, said block comprising a metal frame hav
ing a retaining wall extending rigidly about the
entire periphery of `the block and substantially
nto vtheiuppe: andilower faces ofthe block, parti
tion means integral with said frame between its
upper and lower faces for securing a filling there
to, said partition means having openings there
through for accommodating said filling, and a
filling of resilient rubber-like material retained
by said wall, said filling being substantially en
tirely within said wall and extending through
Ht, I|`I to provide space for a shaft retaining
clip |25 of U-shape.
The opposite end of the track block is formed
said partition with upper and lower faces of the
with bifurcated jaws I 25, |21 at its opposite sides
filling substantially ñush with and exposed at the
and a central jaw |28 of similar construction.
upper and lower margins of the wall over a sub
A pair of retaining blocks |29, |30 _are adapted 30 stantial area of both said faces of the block and
to fit between the jaws |26, |21 respectively, where
providing load transmission through the filling
they are retained by screw bolts |3|, |32 pass
directly from face to face thereof while being
ing through the blocks and the jaws. The blocks
restrained from spreading by said retaining wall.
|29, i3 have aligned apertures for receiving the
3. A track block for a self-laying track type ve- . .
ends of the shaft or hinge pin lëil which is Fixed 35 hicle, said block having opposite wheel-contact
ing and tread faces and comprising a metal frame
the hinge pin and the blocks. At the center of
having a retaining wall extending rigidly about
the track the U-shaped clip 1125 is looped about
the entire periphery of the block and substantially
the hinge pin between thetorsion bushings, and
to both said faces o-f the block, partition means
its ends are inserted between the jaws |28 where 40 integral with said frame between said faces for
they are retained by a screw bolt I 36 passing
securing a filling thereto, said partition means
thereto as by taper pins |33, |34 passing through`
therethrough. The arrangement is such that ad
jacent blocks may be separated by removing Ythe
three screw bolts |3I, |32, |36.
The resilient torsion bushings are inserted in
the knuckles under radial compression together
with the hinge pin, the radial compression being
suf?cient to prevent turning of the outer shell
members in the knuckles during use.
The U
shaped clip employed at the central position be
tween the knuckles may be inserted about the
hinge pin after the bushings and the shaft have
been pressed into position by pressure applied ax
ially thereof.
'
The resilient filling material may be molded in
place in either of the track blocks shown by the
use of plain mold plates engaging the tread face
and the wheel-engaging face respectively o'f the
block to confine the material during vulcaniza
having openings therethrough for accommodat
ing said filling, a filling of resilient rubber-like
material retained by said wall, said filling being
` substantially entirely within said wall and ex
tending through said partition withl upper andV
lower faces of the filling substantially flush with
and-exposed at the upper and lower margins of
the wall over a substantial area of both said faces
of the block and providing load transmission
through the filling directly from face to face
while being restrained from spreading by said
retaining wall, and guide means integral with
said `frame and said partition for aligning the
\ block with a track-engaging wheel.
4». A track block for a self-laying track type
vehicle, said block having opposite wheel con
tacting and tread faces and comprising a retain
ing wall extending rigidly about the wheel con
tion. A convenient molding procedure is‘by in 60 tacting portion thereof and substantially to both
jection of the plastic material through an open
faces of the block, a filling of resilient rubber-like
ing in one of the mold plates while the plates
material retained by said wall, said filling being
are bolted to the faces of the block. Heat may
then be applied to the block as by placing the
block and theenclosing mold plates in an open
stearnv vulcanizer. If it is desired to provide the
filling extending above the tread face or the
wheel-engaging face of the block, cavities may
exposed overa substantial area of both wheel
contacting and tread faces of the block providing
load transmission through the filling directly from
face to face thereof while being restrained from
spreading throughout substantially its entire
`depth by said retaining wall, and guide means
within said retaining wall and integral therewith
be provided in the mold plates for accommodat
70 for aligning said filling with a wheel of the vehi
ing the excess material.
cle, said guide means providing support for said
The metallic frames of the track blocks shown
ñlling.
.
’
are readily cast, forged, or assembled and welded,
5.
A
track
block
for
a
self-laying
track type ve
and require a minimum amount of machining.
hicle, said block having opposite wheel contacting
Variations may be made without departing 75 and tread faces and comprisingl a retaining Wall
2,409,502
7
8
extending rigidly about the wheel contacting por
ing portion thereof and substantially to both faces
tion thereof and substantially to- both faces of
the block, a ñlling of resilient rubber-like mate
rial retained by said Wall, said filling being ex
posed over a substantial area of both wheel-con
of the block, a filling of resilient rubber-like mate
rial retained by said Wall, said filling being ex
tacting and tread faces of the block providing
load transmission through the filling directly from
face to face thereof While being restrained from
spreading throughout substantially its entire
face to face thereof While being restrained from
depth by said retaining wall, partition means
spreading throughout substantially its entire
depth by said retaining wall, partition means l() within said retaining wall, said partition means
having openings therethrough for accommodat
within said retaining Wall, said partition means
ing said filling, guide means integral with said
having openings therethrough for accommodat
partition means for aligning said filling with a
ing said filling, and guide means integral with
wheel of the vehicle, and wing tread portions in
said partition means for aligning said filling with
15 tegral with said retaining wall and extending
a wheel of the vehicle.
laterally of the Wheel-contacting face for increas
6. A track block for a self-laying track type
ing the area of contact with the ground.
vehicle, said block having opposite Wheel contact
CHARLES W. LEGUILLON.
ing and tread faces and comprising a retaining
ALVIN S. KROTZ.
Wall extending rigidly about the wheel contact
posed over a substantial area of both wheel-con
tacting and tread faces of the block providing
load transmission through the filling directly from
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