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Патент USA US2412122

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Dec. 3, 1946. '
‘,
T. D. CAMPBELL
ENDLESS
TRACK FOR VEHICLES
Filed March 15, 1945
111533} -
'
2,412,122
_
I
Patented Dec. 3, 1946
. 2,412,122;
UNITED‘. STATES PATENT oFFicE-ff
‘
2,412,122
‘ENDLESS TRACK FOR VEHICLES
’
Thomas DrCampbell," Hardin, Mont. :
a , Application'March ‘15, 1945,,Serial No. 582,930
10 Claims. (01. 305-;10)
I
,
1
V-belt.
. ‘
on the idle sprocket or other suitable means will GI
provide the proper tension for the friction drive
of the belt.
,
_
V
.
1
especially after being used for
a considerable time, endless tracks have a tend
ency to become loose and to ride over the sides of
this is adequately taken care of by the provision
of a plurality of driving lugs. The load is‘ taken
by the lugs for only about ten per cent of the
time during which the endless track will make a
and eliminate the damage and breakages caused
by worn links which lose their pit-ch and climb
.
,
Heretofore, and
the drive sprockets. In the present invention
.
‘Such altrack, non-stretchable, with solidly at
tached driving lugs will maintain constant pitch
the sprockets.
2
they can be driving pins which are forced into the
rubber or other material tread attached to the
This invention relates to a new and improved
type of vehicle track in the form of a continuous
V-belt or belts including‘ a positive drive by
sprockets and pins when needed; A coil spring
complete revolution of the track, i. e., when the
-
track travels from one point back to that point.
A primary object of- the invention is to provide
These lugs-are combined with a V-typ'e‘side wall
an endless track drive including a positive drive
by a sprocket drive mechanism, and a side wall 15 drive. Practically all of the driving is trans
mitted through the side walls of the'V-track, and
drive.
not much of the driving torque is carried by the
Another object of paramount importance is to
lugs. The principal function of these lugs is to‘
provide an endless track drive provided with
prevent slipping of the track. '
‘
means for preventing the endless track from
'overrunning the sprocket wheel, i. e'., riding over 20 The numeral I diagrammatically indicates .a
vehicle, such as avtank, having a turret2 and a
one of the sides of the wheel drive.
gun 3. Also diagrammatically illustrated are two
A further object of, the invention is to provide
axles 4 and 5 locatedrespectively at the forward
a dual drive which employs a belt as the prin
' and rear ends of the vehicle. Mounted on these
cipal element of the endless track, said belt hav
ing side driving walls and being a V-type belt.
25 axles 4 and 5 are sprocket drives including drive
wheels 6 and 1, respectively.
. .
Still another object of the invention is to pro
These wheels are preferably identical‘ an'd‘the
vide an endless track, drive for caterpillar type
description of the sprocket 6 in“Fi'g'ure 2 'willex'e
vehicles such as tanks, as well as for othertypes
of vehicles such as a six by six truck.
'
'
Other objects will appearhereinafter through
30
out the speci?cation and will ‘be apparent from a
consideration of the following description of 'cer
tain embodiments of the invention, as shown in
the accompanying drawing, in which:
I
.
plain
, As shown
the construction
in Figure ‘of
2, each.
8and 9‘’ are‘
‘ .. ring-like
'
members which are provided with peripheral por
tions l6 and H, which portions are further pro
vided ‘with driving teeth‘M and I5, respectively.
The, ring-like‘ members are rigidly mounted on‘
Figure 1 is a somewhat diagrammatic side ele- ,co til the drive wheel 6 by means of a series of spaced
vation of a vehicle of the type with which the
present invention may be used;
-
Figure 2 is a vertical section of one of the drive
sprockets, partly broken away, and the endless
track;
‘
.
-
.
Figure 3 is a perspective View of one form of
cleat having driving lugs thereon, and
>
, Figure 4 is a view of an alternate form of end
less track showing the cleats and lugs forming
separate parts thereof.
The load is taken by the lugs only when condi
. tions cause the V-belt to slip. It is the intention
that the track will be a properly‘designed V-belt
reinforced with wire or other ?exiblecables, with
‘threaded studs 2i and 22 which are adapted to
mount ends 23- and 24, respectively.- The ring
like members 8 and 9 are provided with a series
of apertures corresponding to the studs 21» and
22 in order that these members 8 and. 9 may be
rigidly, but 'detachably mounted on said drive
‘wheels. As so assembled each constitutes a
sprocket drive.
.
.
v
The periphery of each drive wheel 6 and ‘I is
45 notched to provide inclined side driving walls 12
and
i3.
-
r
-
The endless track member 25 may be suitably
constructed of rubber or similar material." .In
the illustrated embodiment: the endless' track
su?‘icient side wall friction ‘to transmit driving 50 member is-provided with side driven. walls ".21
and 28 which are'driven by the side walls lv2_and
power except undervery unusual conditions. .
i3, respectively, of the wheel?. .
,
Y
Y ;
The lugs and sprockets will then transmit the
Mounted upon the periphery of the endless
power to the ground through the belt and no in
' track member are a plurality of cleats 16, which
jury will be ’done to theV-belt by slippage.
These driving lugs can be part of the cleat or .55 cleats are provided with substantially horizontal
72,412,122
3
4
portions [1. Mounted on the side faces of ‘each
cleat are lugs 3i and 32 which are adapted to
be engaged by the driving teeth I5 and I4, re
spectively, as shown in Figure 2.
1. An endless track for vehicles having in com
bination, wheels at the forward and rear ends
' The upper corners of the endless track mem~
endless drive member composed of ?exible ma
ber are provided with notches 25. The lugs are
provided with webs I8 and I9 which form a driv
terial having side driving faces adapted to be
engaged by'the said driving faces of said wheel,
said endless drive member having'lugs adapted
ing ?t with the notches 26 and into which they
extend.
to be engaged by said sprocket teeth, ‘said wheel
Each cleat is mounted on the endless track.
side driving faces and said endless drive meme
member by means of headed bolts 20 having
shanks 30 extending from the endless track and
nuts on the opposite end as shown in Figure 2.
driving means for said endless drive member, said
Extending longitudinally of the endless track
member are a'series of reinforcing members 29.
structed and adapted to simultaneously engage
the side. driving faces of at least one of said
These members may be constructed of drawn
wire.
In the form shown in ‘Figure 4 the endless.
track member is provided with cleats I6’ and as
will be noted from an inspection of this ?gure
these cleats are not provided with the lugs 3i
and 32 such as shown in Figures 2 and 3. ‘Each
cleat has a substantially horizontal portion I'I'.
ber side driving faces being substantially the sole
endless member side driving faces being con
wheels, said lugs assistinglsaid side driving faces,
of said wheel and endless member when slippage
of said endless drive member occurs and said
driving faces of said drive member being com
posed of ?exible material, said side driving faces
of said endless member being continuous~with
said endless track.
'
‘
Each cleat is held to the endless track member
2. An endless track for vehicles having in corn
bination, wheels at the forward and, rear ends,
by means of headed boltsill'. It is to be under
thereof, ‘atleast one of said wheels having side ,
stood that the endless track shown in Figure 4
is provided with side driving‘walls similar to the
side driving walls 21 and 28 of the endless track
member shown in Figure 2. The side walls of
this endless track member are provided with
driving faces, sprocket teeth on said wheel, an
endless drive member composed of ?exible'ma
terial having side driving faces adapted to be,
engagedby said driving faces of said Wheel, said
spaced apertures, preferably midway between
each pair of cleats I 5’ to provide a driving ?t
for the lugs 50'. Each lug 59 is mounted in sub- ’
.
thereof, at least one of said wheels having side
driving faces, sprocket teeth on said wheel, an
endless drive member having'lugs adapted to be
engaged by said sprocket teeth, said endless
drive member having, a plurality of cleats mount
ed on the periphery thereof, said wheel side driv
ing faces and said endless drive member ‘side
stantially the same position with regard to the
endless track member, as the lugs 3| and 32 shown 35 driving faces being substantially the sole driving
in Figure 2. In other words the apertures in the
means for said endless drive. member, said end—~
endless drive ‘member shown in dotted lines in
less member side driving faces being construct
Figure 4 are located in the upper portion’ of the
ed‘ and adapted to simultaneously engage the
endless drive member, 1. e.,both the side driving
side driving faces of at least one of said wheels, »
walls thereof. Any suitable means, not shown, 40 said lugs assisting said side driving faces of'said
may be used to retain the lugs 50 in the‘ position
Wheel and endless member when slippage of said
shown in‘ Figure 4, should the driving ?t of these
endless drive member occurs and said driving
lugs. be" insuf?cient' to prevent them from work
faces of said drive member‘ being composed of
ing out of the endless track member.
?exible material, said side driving faces of said
It will be understood that the present inven; >
endless member being continuous with said end
tion may be applied to any vehicle which em
less track.
_
ploys an endless track including tanks, cater
3. An endless track for vehicles having in com
pillar tractors, trucks, aircraft, and in fact. all
bination, wheels at the forward and rear ends
types of vehicles.
'
thereof, at least one of said Wheelsv having side
It will be understood that I may use, without driving faces, sprocket teeth on said wheel, an
departing from the spirit of this invention, any
endless drive member composed of ?exible ma
number of endless, track members, it being, only
terial having side driving faces ‘adapted to be
necessary to provide each of the sprocket drive
engaged by said driving faces of said wheel, said
wheels with a corresponding number of notches,‘
endless drive member having lugs adapted to be
each having inclined side walls similar .to the. engaged by said sprocket teeth, said endless drive
side Walls I2 and 13.
member having a plurality‘of cleats mounted on
The V-drive portion of the endless track mem—
the periphery thereof, said lugs being integral
ber may have attached to it the so-called tread
with said cleats, said wheel side driving faces and
portion by means of vulcanizing. The line of
said endless drive member side driving faces be
separation between these two portions has been 30 ing substantially the sole driving means for said
indicated in Figure 2 by a, dotted line.
endless'drive member, said endless member side
With the present invention all tendency of the
driving faces being constructed and‘ adapted to
endless track member to ride over either side
simultaneously engage the side driving faces of
In or II ofthe drive is obviated by the provision
at least one of said ‘wheels, said lugs assisting
of the lugs‘ which prevent the accumulation of
said side driving faces of said wheeland endless
slack at each end of the drive, i. e., while the
member When slippage of said endless drive mem
endless track member is passing over the drive
wheels 6 and ‘I.
'
, It is to be understood that the invention is not
limited to the speci?c details of construction ‘”
shown in the accompanying drawing and de
scribed above, but that it covers all modi?cations
coming within the scope of the appended claims
and their equivalents.
In the claims:
ber occurs and said driving faces of said drive
member being composed of ?exible material, said
side driving faces of said endless member being
continuous with said endless track.
4. An endless track for vehicles having in com
bination, wheels at the forward and, rear ends
thereof, at least one of said wheels having side
driving faces, sprocket teeth on said ‘wheel, an
endless drive member composed of ?exible mate
2,412,122
rial having side driving faces adapted to be en
gaged,by' said driving faces of said wheel, said
endless drive member having lugs adapted to be
engaged by said sprocket teeth, said endless drive
member having a plurality of cleats mounted on
the periphery thereof, said lugs being integral
with said cleats and extending from the sides
thereof, said wheel side driving faces and said
endless drive member side driving faces being
substantially the sole driving means forsaid end
less drive member, said endless member side driv
ing faces being constructed and adapted to simul
taneously engage the side driving faces of at least
ends thereof, said drive wheels having inclined
driving faces, a plurality of sets of sprocket teeth
on each of said wheels between which is located
said inclined side driving walls, an endless track
member composed of ?exible rubber or similar
material, said member having inclined faces
thereon adapted to be engaged by the Walls of
each of said wheels, a plurality of‘ cleats, means
mounting said cleats on said endless track mem
ber, lugslon said cleats extending from the sides
of said cleats and adaptedto be engaged by the‘
sets of sprocket teeth, said track member being
provided with a series of notches and said cleats
each having webs which ?t into said notches,
one of said wheels, said lugs assisting said side
driving faces of said wheel and endless member 15 said wheel inclined driving walls and said ende
less drive member including driving faces ‘being
when slippage of said endless drive member oc
substantially the sole driving means for said end
curs and said driving faces of said drive member
less drive member, said inclined faces being con
being composed of ?exible material, said side
structed and adapted to simultaneously engage
driving faces of said endless member being con
the side driving walls of said drive wheels, said
tinuous with said endless track.
lugs assisting said side driving walls when slip
5. An endless track for vehicles having in com
page of said endless track member occurs, and said
bination, drive Wheels at the forward and rear
inclined faces of said drive member being com
ends thereof, said drive wheels having inclined
posed of rubber or similar material, said inclined
driving faces, a plurality of sets of sprocket teeth
faces of said endless member being continuous
on each of said wheels between which is located
with said endless track.
said inclined side driving walls, an endless track
8. An endless track for vehicles having in com
member composed of ?exible rubber or similar
bination, drive wheels at the forward and rear
material, said member having inclined faces
ends thereof, said drive wheels having inclined
thereon adapted to be engaged by the walls of
each of said wheels, a plurality of cleats, means 30 driving faces, a plurality of sets of sprocket teeth
on each of said Wheels between which is located
mounting said cleats on said endless track mem
said inclined side driving walls, an endless track
ber, lugs on said cleats extending from the sides
member composed of ?exible rubber or similar
of said cleats and adapted to be engaged by the
material, said member having inclined faces
sets of sprocket teeth, said Wheel inclined driv
thereon adapted to be engaged by the walls of
ing walls and said endless drive member includ
each of said wheels, a plurality of cleats, means
ing driving faces being substantially the sole driv
mounting said cleats on said endless track mem
ing means for said endless drive member, said
ber, lugs on said cleats extending from the sides
inclined faces being constructed and adapted to
of said cleats and adapted to be engaged by the
simultaneously engage the side driving walls of
said drive wheels, said lugs assisting saidside 40 sets of sprocket teeth, said endless track member
having oppositely spaced pairs of notches, and
driving Walls when slippage of said endless track
each cleat having a pair of oppositely spaced webs
member occurs, and said inclined faces of said
adapted to fit within each pair of spaced notches,
drive member being composed of rubber or sim
said Wheel inclined driving walls and said end
ilar material, said inclined faces of said endless
less drive member including driving faces being
member being continuous with said endless track. ~
substantially the sole driving means for said end
6. An endless track for vehicles having in com
less drive member, said inclined faces being con
bination, drive wheels at the forward and rear
structed and adapted to simultaneously engage
ends thereof, said drive wheels having inclined
the side driving walls of said drive‘ wheels, said
driving faces, a plurality of sets of sprocket teeth
on each of said wheels between which is located .
lugs assisting said side driving walls when slip
said inclined side driving walls, an endless track
member composed of ?exible rubber or similar
page of said endless track member occurs, and
said inclined faces of said drive member being
composed of rubber or similar material, said in
clined faces of said endless member being con
tinuous with said endless track.
9. An endless track for vehicles having in com
bination, drive Wheels therefor, each of said drive
material, said member having inclined faces
thereon adapted to be engaged by the walls of
each of said wheels, a plurality of cleats, means
mounting said cleats on said endless track mem
ber, lugs on said cleats extending from the sides
wheels having side driving faces, sprocket teeth
of said cleats and adapted to be engaged by the
on said wheels on opposite sides of said faces,
sets of sprocket teeth, said means for mounting
said cleats comprising a series of ?anges and 60 an endless track member having continuous and
uninterrupted rubber or rubber like side driving
fastening means extending through said ?anges
faces adapted to be engaged by said driving faces
and said endless track member, said wheel inclined
of said walls, said endless driving member having
driving Walls and said endless drive member in
member occurs, and said inclined faces of said
drive member being composed of rubber or sim
lugs ‘in position to be engaged by said sprocket
teeth, the said driving faces of said drive wheels
being widely spaced from each other and being
at their Widest spacing substantially the same
width as the side driving faces of said endless
driving member, the said side driving faces of said
member being constructed and adapted to simul
taneously engage the side driving surfaces of each
ilar material, said inclined faces of said endless
member being continuous with said endless track.
7. An endless track for vehicles having in com
bination, drive Wheels at the forward and rear
when slippageof said endless driving member
occurs, the said side driving faces of said endless
member being continuous with said endless track.
cluding driving faces being substantially the sole
driving means for said endless drive member, said
inclined faces being constructed and adapted to
simultaneously engage the side driving walls of
said drive wheels, said lugs assisting said ‘side
driving walls when slippage of said endless track
drive wheel, said lugs assisting said driving faces
2,412,122
7
8‘
' 10. An endless track for vehicles having in com
other and being at their widest spacing substan
bination, drive wheels therefor, each of said drive
wheels having side driving faces, sprocket teeth
tially the same Width as the‘side driving faces of
on said wheels on opposite sides of said faces,
v
an endless track member having continuous and
uninterrupted rubber or rubber like side driving
faces adapted to be engaged by said driving faces
of said Walls, said endless driving member hav
ing lugs in position to be engaged by said sprocket
teeth, a series of spaced cleats mounted on said 10
endless drive member, the said driving» faces of
said drive Wheels being Widely spaced from each
faces of said member being constructed and
said endless driving member, the said side driving
adapted to simultaneously engage the side driv
ing surfaces of each drive Wheel, said lugs assist
ing said ‘driving faces when slippage of said end
less driving member occurs, the said side driving
faces of said endless member being continuous
With said endless track.
THOMAS D. CAMPBELL. ’
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