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Патент USA US2108304

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Feb. 15, 1938.
2,108,304 >
Filéd Sept. 5, 19:53 .
21y- /
J4 Z4 2242/ 35
Mum/117L526”; .
‘ Patented Feb. 15,1938
, 2,103,364
- 2,108,304
nsn'rn uovmo. nnvrcn
Roy E. Choate', Waldo E. Rodler, and William
v I. Leech, Cedar Rapids, Iowa, assignors to La
Plant-Cho'ate Manufacturing Co. Inc., Cedar
Rapids, Iowa, a corporation of Delaware
' ' Application'september 5, 1933, Serial No.688.178
‘ 1
(Cl. 37-144)
and has particular relation to devices in which a ,
Figure l is a side 'view in perspective of a
tractor to‘awhich a scraper blade, blade-support
ing side frames, and a blade actuating mech-'
scraper blade is mounted for pivotal movement
in front of a tractor or like prime mover. . v
In devices of the character with‘which we are anism constructed according to our. invention 5
now concerned a pair of frameworks are pivotally have been attached, and
attached, one on each side of a tractor, to the ' Figure 2 is a quartering view in perspective of
crawler track sub-frames thereof, and a scraper a portion of the track, the track supporting sub
frame, a ‘hydraulic jack, and a jack supporting
linkage constructed according to our‘ invention.
We are hereprincipally. concerned with the
vblade is attached to the front ends of these side
10 frames. An actuating mechanism for raising
and lowering the rear ends of the frames to cor
respondingly lower and raise the scraper blade
means by ‘which reactive forces
> 20
on the A
Jack are transmitted to the sub-‘frame of the
tractor, in order to "by-pass" theselfcrces around the tractor supporting springs. We are, there- 15
is mounted at therear of the tractor.
It has been found that the torque or turning
15, eil'ort necessary to raise and lower the scraper
blade may compress the springs, by which the
tractor is supported on the sub-frames, to an
In said drawing:
This invention relates to earth moving devices
fore only incidentally concerned, at‘ this time
with the scraper blade, scraper blade mounting,
undue extent, thus sometimes causing breakage side'frames, and the side frame actuating shaft
and levers. A more detailed description of these
of these springs, or of thescraper blade support
parts‘ is given in a co-pending application by
ing and actuating mechanism, or other parts of
the tractor.
Herbert H. Pearson, ?led August 18, 1932, Serial ‘
After considerable study of this ‘ problem we
Number 629,297, - Patent Number . 136L011 on
have reached the conclusion that the undue com‘ earth moving devices, and a co-pending applica
pression of the springs which support the tractor 'tion by Roy E. Cheats" and Waldo E. Rodler on .
25 on'the ‘sub-frames is caused by thereaction set earth moving devices, ‘tilled May '9, 1932, Serial 25
up by .the hydraulic jack which actuates the ‘ Number 610,194, Patent Number 2,030,352.
Referring‘ to the drawing, there'is shown at
frame raising and lowering mechanism. We have
found that, if the reaction set up in the jack‘ by it generally, a tractor having a sub-frame or
pushing the vpiston rod in and out is conveyed track frame it, on which the tractor is resil- '
30 to sub-frames of the ‘tractor, undue compression" iently mounted, and wheels ' it and track belt it 30
of the tractor supporting springs is avoided.
, _
for suppo
the sub-frame.
» ‘
The tractor is'supported with relation to the
We have, therefore, devised a .meansi‘or con»
veying the reactive forces set up in the hydraulic
vsnbéframes it by means of coil springs or the ‘
. jack directly to the sub-frame of the tractor, and like (not shown) in order that shocks or ‘follows
in-this way have ‘avoided the dimculties above- ‘ ‘on the suite-frames will not be transmitted to the
fine of ‘the sti?ening or supporting members _ Y
A general'object of your invention is to provide
means for conveying certain forces set up in a. of the sub-frame i l is- a longitudinally-extending
plow actuating mechanism to members which are ' channel member if, and. the wheelbearings, in
dicated generally at it, are attached to this chan co
not harmed by'such forces.
' ‘
A more specific object of our invention is to nel' member it. v
A pair of triangular side-frame members, in=
provide in an- earth moving device a it ==ge sys
‘ tem for conveying the reactive force of aplow _'dicated generally at. ll, are pivotally attached,
actuating mechanism to the sub-frame of the one on each side of the tractor, to the mid-point '
45 tractor.
Another object of our invention is to provide
guide means for guiding’ the side frames of‘ an
earth moving device of the type here considered.
of the channel members M, as by means of bractz- 4'5
ets Iii on the channel members.
v ,The triangular side-frame members are each
comprised of a long top member ii, a. forwardly
projecting channel member 2i, and a irearwardiy
50 means wherebyundue compression of the trac- , projectingchannel member 22,'with members i9
and I! joined at their front end by means or a
tor supporting, springs is avoided.
' , Another object of our invention is to provide
Other and further features and objects at our
invention will be more apparent to those skilled
' in the art upon a consideration of the accom
55- panying drawing and following speci?cation,
wherein is disclosed an exemplary embodiment
of the invention, with the understandi, how
ever, that‘suoh changes may be made therein as
fall within the scope of the appended claim with
50 out departing from the spirit of the invention.
plate 23, and at- the rear‘ ends'by means oil a cap 24. - The mid-point of the frame-members is N .
sti?ened by means 'of a plate 2t.
The- lower_or forward end of the member 22 55
is provided with a, pair of brackets El and 28
having means for engaging across shaft 29,
which in turn‘ is iournaled in the brackets IS.
The ‘scraper blade 3i is'fastened to the front ends
at the side framemembers l1 and this scraper >60 '
blade is suitably curved and provided with uni
versal Joints in order that it may be moved to
any desired position.
A cross-shaft 32 extends across the rear of the
tractor, and a bifurcated lever arm 38 is attached
to the'outer end of the shaft 32 so that when
pressure is applied to the piston rod 34 the lever
arm 33a is moved to rotate'the shaft 32 and thus
rotate the lever arm 33b. Rotation of the lever
10 arm 33b in one direction or the other causes a
corresponding movement of the rear ends of
the side frames i‘! in a corresponding direction
by reason of the connecting links 38.
The piston rod 34 is moved in and out by
15 means of a hydraulic jack, the cylinder of which
is indicated at 31. Fluid for actuating the piston
of the hydraulic jack is introduced into the Jack
by means of the hose connections 38 and”. It
is apparent that if ?uid is introduced into the
20 jack through-the hose connection 39 the piston
rod 34 will be pushed outwardly to rotate the
lever 33 in a counter-clockwise direction to draw
down the rear end of the side frames i1 and thus
raise the scraper blade; When ?uid is intro
25 duced into the Jack through the hose II a re
verse movement of the parts of the device occurs
ope'ratively engaged to- the sub-frame channel
member l4 by means of a ladder-like yoke 44.
This yoke 44 is provided with a bracket member
40 at its upper end in order that the yoke may
be engaged to the lever arm 48 as by means of
the pivot pin ll.
otally attached to the channel members II and
I4 by means of a rub iron bracketindicated at 10V
If. This rub iron bracket is recessed as indi
cated at 83 in order that it may be secured to
the channel members II, as by means of bolts
44, ‘and the outer face of the rub iron bracket
is flat in order that it may cooperate with a 15
rub plate II which is fastened to the members
ll and'fl of the side frame members and thus‘
act as an additional guiding means for the side
frame members to take any transverse or lateral
forces set up in-the scraper blade. The rub iron
bracket" 52 is provided with tip-struck lugs 41
at the upper portion thereof, in order that the
yoke 48 may be pivotally attached thereto, as
by means of pivot pins 58.
The inner lower end of the yoke 48 is attached 25
to the inner portion of the sub-frame II by
and the blade 3! is lowered, or may even be‘ means of a second bracket 52d which is of the
same construction as the_bracket 52 previously
forced downwardly by the hydraulic jack.
It is apparent that when hydraulic pressure is described, but which is fastened to the sub-frame
applied to the _ Jack 31 the piston rod 34 is in reversed position.
It is apparent that the reactive forces set up
forced outwardly or inwardly, and a correspond
ing force or reaction is set up in the cylinder in the jack and particularly at the lack cylinder
are transmitted directly‘ to the sub-frame of the
of the hydraulic jack. This reactive force usual
ly acts in a substantially horizontal plane and tractor and thence to the ground, thus avoiding
drives the mounting of the Jack forwardly or compression of the tractor supporting springs 36
rearwardly, thus at times causing the tractor and avoiding breakage of the tractor parts. Fur
to pivot about at substantially its mid-point to thermore it is apparent that simple means have
compress the tractor supporting springs. It is. been provided for guiding the side frame mem
of course, very desirable'to avoid this last named bers of the scraper blade manipulating mecha
condition and this is one of the main objects of
It is obvious that the reactive forces in the
ourv invention.
In order to avoid undue compression of the
tractor supporting springs, and undue stresses ground by other means or that they may be
in other parts of the tractor, we havedevised a transmitted to some part of the tractor where
means for transferring the reactive force set up the force can do no harm. These and other 45
in the jack by the actuation of the scraper blade modifications may be made by those skilled in
manipulating means, directly from the jack to the art without departing from the spirit and
scope of our invention as set forth in the apthe sub-frame and running gear.
pended claim.
One means for obtaining this result is illus
A cross-member l2 aids in
stiffening the yoke member.
The lower end of the yoke member 44 is piv
50 trated in the drawing.
In this device trunnion
bearings 42 areprovided at thev rear end and on
top of the platform, fender or running board 4|,
and a lever arm or link, comprised of a channel
member 43, extends forwardly from, and is' piv
65 otally attached to, the trunnion bearings 42. Up
struck trunnion brackets 44 are secured to the
lever arm at an intermediate point thereof at a
position along the length of the arm which is
so chosen that least movement of the tractor oc
60 curs when the scraper blade is being manipu
‘ lated. The hydraulic jack cylinder 31 is pivot
ally supported by these trunnion brackets 44 in
order to permit the cylinder to pivot as the arm
We claim as our invention:
In an earth moving device including a tractor
andrunning gears for the tractor, aside frame
pivotally mounted on the running gears and ex
tending substantially ‘the length of the tractor
and projecting in front thereof, a plow blade
mounted on the front end of the side frame, a
cross shaft pivotally mounted at the rear of the
tractor and having a lever arm ?xed thereon, a
link for connecting the lever arm on the cross
shaft with the rear end of the side frame, a hy
draulic jack and a support for the Jack compris
ing a platform pivotally mounted on the rear
portion of the tractor'and extending forwardly
therefrom and a link for connecting the free end
of the platform to the running gear of the trac
65 on the link 43 may be at any point along these .
tor, the iack'being pivotally mounted upon the
respecting members. A rub iron plate 46 is se
cured to the outermost of the trunnion brackets platform and operatively connected with the
44 and acts in cooperation with a plate 41 on lever arm on the cross shaft.
frame members l9 and 22 as a guide to prevent
Roy E. cnoa'm.
70 “weaving” or side-motion of- the side - frame
wamo a. aonmm.
wnmm : I. macs.
The free end of the lever arm or link 4! is
Ila rotates. The pivot points of the cylinder 31
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