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Патент USA US2281224

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April 28, 1942-
Filed May 6, 1941
4 Sheets-Sheet 1
Danlzl E Boumga
April 23, 1942-
Filed May 6, 1941
4 Sheets—Sheet 2
Daniel E Baumgari'nerr
April 28, 1942.
Filed May 6, 1941
4 Sheets-Sheet 3
D G H Wu. CL B G U m a: 0 r IT n Z E
Filed May. 6’ 1941
4 Sheets-Sheet 4
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Patented Apr. 28, 1942
Daniel F. Baumgartner, Bucyrus, Ohio
Application May 6, 1941, Serial No. 392,064_
4 Claims.
(Cl. 37-156)
My invention relates to a grader. It has to do,
more particularly, with a road grader which is
the surface to be graded. Suspended from the
main frame is a sub-frame which carries a
provided with a scraper blade adapted to operate
scraper blade that is normally transversely dis
posed and in horizontal position. The front end
of the‘ sub-frame is pivotally connected to the
main frame and the rear end of the sub-frame is
suspended from the main frame by lifting links in
in a horizontal position or at any desired angle
relative to the horizontal.
In the past, several different types of road
graders have been provided which have included
a scraper blade that could be adjusted from the
horizontal position to any desired angular posi
such a manner that the sub-frame may be swung
towards and away from the main frame. This
tion up to a substantially vertical position. This 10 varies the distance of the scraper blade from the
main frame. The sub-frame is supported on the
type of road grader is adapted to be used for
main frame in such a manner that the entire sub
grading horizontal road surfaces or for grading
frame may be bodily revolved around the longi
the vertical surfaces of ditches or banks. How
tudinal center line of the main frame. This ad
ever, the prior art road graders of this general
justment is for the purpose of moving the scraper
type have been possessed of certain undesirable
blade to any desired angle from a horizontal posi
features. Usually the scraper blade is carried on
tion to a vertical position. Furthermore, the
a sub-frame which is carried by~a main frame.
sub-frame will revolve bodily around the main
The sub-frame is ordinarily connected at its front
frame. Therefore, binding and resulting exces
end to the main frame by a, universal joint which
is in, a ?xed position while the rear end of the 20 sive strains will be eliminated from the machine.
Thus, the adjusting of the scraper blade between
sub-frame is so mounted that‘it can be swung
around the main frame to position the scraper / . horizontal and vertical positions is accomplished
without the use of telescoping or collapsing con—
blade at the desired angle. With this structure,
necting links on lateral shifts and without short
the sub-frame is not rotated bodily about the
main frame, which corresponds to the line of
draft or pull, and, consequently, binding and re
sulting excessive strains will be set up in the sub
frame, the scraper member and other parts asso
ciated with the sub-frame.
One of the objects of my invention is to pro
ening or lengthening the lifting links. The
scraper blade is carried on the main frame by
means which permits swinging of the blade to
vide a road grader which carries a scraper blade
that can be adjusted from a horizontal position
to any desired angular position up to a vertical
position so that it may be employed for grading
horizontal surfaces, such as a roadbed, or angular
or vertical surfaces, such as banks or the walls'of
ated with ease.
a ditch.
Another object of my invention is to provide a
road grader of the type indicated in the preceding
any desired angle in a horizontal plane.
All of
the movable units of the machine are preferably
controlled hydraulically so that they may be oper
The preferred embodiment of my invention is
illustratedin the accompanying drawings where
in similar characters of reference designate corre
sponding parts and wherein:
Figure 1 is a perspective view of a machine
constructed according to niy invention.
Figure 2 is a- longitudinal sectional view taken
along line 2-2 of Figure 3 through the main
paragraph wherein the scraper is carried by a 40 frame of my machine.
Figure 3 is a plan view of my invention, show
sub-frame which is adjustable on the main frame
:ing the scraper blade in horizontal position.
in such a manner that it may be rotated bodily
Figure 4 is a similar view of a portion of the
about the longitudinal center line of the main
machine showing the scraper blade in vertical
frame, or line of draft or push, so that there will
be no binding and resulting excessive strain
Figure 5 is a sectional view taken along line
created in the machine during operation.
5—-5 of. Figure 6 showing the sub-frame and
Another object of my invention is to provide a
associated parts of my machine.
machine of the type indicated wherein all of the
Figure 6 is a side elevation of my machine.
movable units are hydraulically controlled so that
Figure 7 is a transverse sectional view taken
they may be adjusted with ease by thepperator i
substantially along line 'l—'l of Figure 3.
from a central location.
With reference to the drawings, I have illus
_ In its preferred form, my invention contem
trated a road grader ‘comprising generally a main
plates the provision of a road grader which em
frame unit I, a sub-frame unit 2 and a tractor
bodies a main frame suitably supported on wheels
or power unit 3. The particular construction-cf
and adapted either to be pulled or pushed along,
2,281,224 .
the unit 3 does not form a part of my invention
and, therefore, ‘need not be discussed in detail.
It is a self-propelled unit adapted to push the
combined units I and 2 along the surface to be
The structure of the main frame unit I is illus
trated best in Figures 2 and 7. It comprises a
‘ pair of longitudinally extending channel mem
bers 4 disposed with their channeled sides to
versal joint 23, to a yoke member 24. This yoke
member 24 depends from a collar 25 which-is
clamped to the forward end of the tube It by
means of a split clamping portion 28. The rear
end of the frame 2 is suspended from the tube
II by means of a pair of hydraulic cylinder and
piston units 21. Each of the units 21 isv pivotally
carried by a yoke 28, as at 2!, for swinging later
ally of the tube‘ I‘. The tube IO carries at dia
wards each other and secured together by weld~ 10 metrically opposed points trunnions 30 upon
which‘ the yoke members 23 are rotatably mount
ing or other suitable means. At the forward
ends of the channels 4 a tubular bearing member ‘
i is mounted thereon and may be suitably an
chored in position. At the rear ends of the chan
ed. Thus, the units. 21 may also swing longi
tudinally of the tube I4. Each of the units 21
is provided with a piston rod 3| extending from
nels a tubular bearing member ‘I is mounted 15 the lower end thereof. The lower end of each
rod 3| is pivotally connected, as at 22, to the rear
thereon and may be suitably anchored in posi
end of the frame 2. Suitable means, to be de
tion. The tubular bearing member 6 fits within
a rearwardly projecting tubular housing 3 which
scribed later, _is provided for controlling the
hydraulic fluid supply to the units 21. This
is formed on the upper portion of a frame sup
port 3. The interior of the housing 3 is provided 20 means is of such a nature that both units 21 may
be operated simultaneously to swing the frame
with an annular shoulder I0 which limits for
ward movement of the bearing 6 into the housing
8. The housing 3 is split at its upper side and
is provided with pairs of lugs 8a which receive
bolts by means of which‘ the split portion of the 25
_ housing may be drawn together to tightly clamp
about the universal joint 23 and thereby raise
or lower the rear end of the frame while still
maintaining it substantially horizontal or it may
be operated to selectively control units 21 in such
a manner as to raise one side of the rear end
of frame 2 and lower the other side thereof. In
other words,‘ frame 2 may be raised or lowered
without'tilting transversely or it may be tilted
II which is swiveled thereto by means of a pin
I 2. The yoke portion II receives an axle member 30 transversely as desired.
Theframe 2 at its rear end is provided with
is which is pivotally connected thereto, as at I4.
the usual type of “circle" 33 for supporting the
The axle I3 carries a pair of pneumatically tired
scraper blade 34. The circle33 comprises a cir
wheels l5. Suitable means (not shown) may be
cular member 35 which has an inwardly proprovided for steering the wheels l5. Further
more, the wheels l5 may be of the tilting type 35 jecting ?ange 38 on its upper edge. This ?ange
36 rests on a plurality of brackets 31 secured to
if desired.
the bearing portion 6 therein. The frame sup
port 3 is provided with a depending yoke portion
The bearing sleeve 6 projects rearwardly from
the housing 8. This projecting portion of the
bearing sleeve receives the forward end of a large
longitudinally extending tube or pipe l8 which is 40
the frame 2 at a plurality of points circumferen
tially of member 35. . The scraper bar 34- is sus
pended from .member 35 by means of rearwardly
and downwardly extending pull bars 38. The
lower end of bars 33 is pivotally connected to
the blade 34, as at 33, adjacent the lower edge
is rotatably carried by a forwardly extending
of the blade. At its upper edge the blade is pro
reduced portion of the bearing sleeve 1. The
vided with pivoted straps 40 which are provided
forward end of the tube I6 will bear against the
rear end of the housing 3 while the rear end of 45 with a plurality of openings H. A pin may be
passed, through any one of these openings into
the tube IE will bear against an annular shoulder
an aligning opening in the bar 33. Thus, the
I‘! on the bearing sleeve 1. The bearing sleeve
blade “may be adJustably pivoted on the bars
1 is supported in a forwardly projecting tubular
38 to any desired position and be held in such
housing IS. The member 1 is held in position
within the housing I8 by means of a collar I! 50 adjusted position.
The member 35 is adapted to be rotated about
which surrounds member l8 and which extends
its axis to swing the blade 34 in a horizontal
over the shoulder I‘! of member 1. However,
plane by means of a cable 42 which passes around
member ‘I may be secured in member l8 by a
the periphery thereof and is held in position
press ?t. The collar I9 is held in position by
means of a plurality of circumferentially spaced 55 thereon by suitable guides. This cable 42 is
passed around a sheave 43 which is keyed to a
bolts 20 which extend through openings in the
shaft 44 extending into a gear housing 45. The
collar and are threaded into the forward edge
pin 44 carries a pinion 46 within housing 45
of member It. The member I! is carried by the
which engages a rack bar 41 slidably mounted
upper portion of an A-type frame 2| which ex
tends forwardly and upwardly from the unit 3. 60 in a guide 48 secured to the housing. This rack
bar 41 forms a portion of a piston rod extending
It will be apparent that when the unit 3 moves
from a hydraulic cylinder and piston unit 49
along, the frame 2| will push the units I and 2
which is pivotally carried as at 50, by the frame
forwardly. The housing 8 serves as a thrust
2. Av suitable control for controlling the supply
bearing at the forward end of the tube l6 while
the bearing sleeve 1 serves as a thrust bearing 65 of ?uid to the unit 43 is provided which will be
explained later. By properly controlling the unit
at the rear end of the tube IS. The tube I8 may
43 the blade 34 may be swung in a horizontal
be rotated about the channel members 4 and
about its own axis. A bolt member 22 passes
plane or about the axis of the circle 33.
through the forward end of the housing 8 and
For rotating the tube I 6 about its axis to re
is threaded into the block 5, carried by members 70 volve the frame 2 about said axis, I provide the
4 at the front ends thereof, to aid in positioning
following structure. It will be noted that a
the housing I on bearing sleeve 6 and to aid in
sheave 5| is formed on the rear end of the tube
keeping it in position thereon.
IS. A cable 52 is passed around this sheave 5|.
The sub-frame 2 is of substantially Y-shape.
The two strands of this cable pass rearwardly ‘
Its forward end is pivotally connected, by a uni
over a pair of sheaves 53 which are keyed on a
rotatable thereon. The rear end of this tube I6
and to a source of hydraulic liquid in the usual
shaft 54 that is transversely disposed and rotat
ably carried by brackets 55 secured to the frame
2|. Shaft 54 is vertically adjustable in order to
adjust the position of the sheaves 53 to provide
‘An important feature of my invention resides
in the fact that the frame 2 is revolved bodily
around the axis of the tube I 6. The force ex
take-up in the cable. The rear portion of the
erted through the frame 2 to pull the blade 34
cable passes around a sheave 56 which is keyed
along with the main frame I will be exerted on
on a shaft 51 that is rotatably carried by the
the axis of the frame 2. The pushing force
frame 2|. Below the sheave 56 the shaft 51 has
exerted by the unit 3 to move the grader itself
a gear 58 keyed thereon. This gear is engaged
by a rack bar 59 which forms a part of a piston 10 along will be exerted along the axis of the unit I.
Thus, binding of the various parts of the machine
rod extending from the hydraulic cylinder and
and resulting excessive stresses will be elimi
piston unit 60. This unit 60 is rigidly carried
nated. Since all parts of the machine are pref
by the frame 2|. A suitable control, referred to
erably hydraulically operated, the machine may
hereinafter, is provided for controlling opera
tion of the unit 60. When the unit 60 is operated, 15 be controlled with ease by the operator from a
central location.
the tube l 6 will be swung about its axis and, con
Various other advantages will be apparent
sequently, the frame 2 will be revolved bodily
from the preceding description, the drawings and
about the axis of the tube l6. With this struc
the following claims.
ture the blade 34 may be swung from the hori
Having thus described my invention, what I
zontal position shown in Figure l and some of 20
claim is:
the other ?gures to the vertical position shown
1. A road grader comprising a main frame,
in Figure 4 or to any desired intermediate posi
said main frame including a support, a tubular
tion. In fact, the blade 34 may be swung to a
vertical position at the opposite side of the ma
chine from that shown in Figure 4.
member carried by said support for rotating
25 about its own axis, a sub-frame suspended from
When the blade 34 is swung into a vertical
position, or approaching a vertical position, at
either side of the machine, it is desirable to have ‘
said tubular member, said sub-frame having its
forward end connected to said‘ tubular member
by a universal joint and having its rear end con
nected to said sub-frame by vertically adjustable
some means for supporting the weight of the
frame 2 and the parts carried thereby other than 30 means, a scraper blade carried by said sub-frame,
and means for rotating said tubular member so
the piston rod 3|. For this purpose I provide a
that the sub-frame will be revolved about the
rod 61 which has one end universally connected,
axis thereof.
as at 62, to the frame .2 and its other end uni
2. A road grader according to ‘claim 1 wherein
versally connected, as at 63,, to a bracket 64 ex
tending downwardly from the tube Hi. This rod 35 the vertically adjustable means includes hy
6| will take the weight off the piston rod 3|
draulically operated cylinder and piston units.
and will prevent binding of the piston rods or
pistons of the units 21.
When it is desired to use my grader for grad
ing substantially horizontal surfaces, the units 1
21 are controlled to adjust the blade 34 to the
proper level. They may be controlled in such a
manner that the blade 34 is horizontal or is
tilted transversely of the machine to produce a
3. A road grader according to claim 1 wherein
the scraper blade is supported on the sub-frame
by means of a circle, and hydraulic means for
crown on the road surface.
The circle 33 may
be operated by controlling unit 49 to swing the
blade 34 to any desired position about the axis of
the circle. When it is desired to use the grader
for grading surfaces at an angle relative to the
horizontal, the unit 60 is operated to cause the
frame 2 to revolve about the axis of the tube I5.
All of the hydraulic cylinder and piston units
may be controlled from a central point. The
control valves are preferably carried adjacent
the operator’s platform on the frame 2| (Figure _
6). Two way valves 21a and 21b are connected
to units 21, and similar valves 49a and 60a are
provided for controlling the units 49 and 60. '
The valves are connected to the various units
controlling said circle.
4. A road grader comprising a main frame,
said main frame including a longitudinally ex
tending beam support, a longitudinally extend—
ing tubular member carried by said support for
rotation about its own axis, a sub-frame sus
pended from said tubular member, said sub
frame‘ having its forward end connected to said
tubular member by a universal joint and having
its rear end connected to said sub-frame by ver
tically adjustable means permitting transverse
tilting of the sub-frame, a scraper blade sup
ported on said sub-frame, said scraper blade be
ing supported by means of a circle permitting
swinging of the bladejn a horizontal plane, and
means ‘for rotating said tubular member so that
the sub-frame will be revolved about the axis
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