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Патент USA US2128881

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Aug- 30, 1933-
Filed May 4, 1956
2 Sheets-Sheet 1
[77/1 ' 6717/5/95 0N,
E. c. lvERsoN
Aug» 30, 1938.
2 Sheets-Sheet 2
Filed May 4, 1956
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Patented Aug. 30, 1938
Emil C. Iverson, Indianapolis, Ind., assignor to
J. D. Adams Manufacturing Company, Indian
apolis, Ind., a corporation of Indiana
Application May 4, 1936, Serial No.‘ 77,682
1 Claim. (0!. 37—156)
My invention relates to road-graders, and spe
ci?cally to road graders of the so-called “high
lift” type in which the blade mounting mecha
the channels forming'the main frame are spread
nism is so arranged that the blade can be dis
apart so as to increase the lateral dimension of
the connection between the main frame and the
rear axle. To stiffen the main frame, those por
5 posed at one side of the grader in an approximate
tions of the channels which are spread apart at
1y verticalposition.
It is the object of my invention to construct
a grader of this type in which the range of ad
justment of the blade will be increased and in
10 which the placing of the blade in the "high-lift”
position will be facilitated.
In carrying out my invention, I provide a rela
tively long frame supported at its front and rear
ends on suitable wheels, and beneath this frame
I mount an adjustable draw-bar carrying the
grader blade.- Preferably, the front-end of the
draw-bar is connected to the front end ‘of the
frame through a universal connection, while the
rear end of the draw-bar is connected to an in
It welded to the lower channel-?anges.
At a point about the middle or slightly in rear
of the middle of the main frame, there is secured
in place thereon a pair of laterally extending 10
brackets l8 which are conveniently welded in
place. The box-section portion of the main frame
extends from the front thereof rearwardly to and
conveniently beyond the brackets l8.
Mounted beneath the main frame I4 is a draw
bar consisting of a central longitudinal member
20 secured to the rear‘end of which, as by welding,
is a transversely extending cross-member 2| lo
cated approximately in or slightly in advance of
termediate point of the frame by three crank and
link connections which serve to‘adjust the rear
end of the draw-bar laterally of the machine and
to rock it about a generally longitudinal axis.
The forward portion of the main frame-i. e., that
portion lying ahead of the crank and link con
the vertical plane containing the brackets l8. 20
The longitudinal draw-bar member 20, like the
front portion of the frame It, is preferably of
The front end of the member 20 is connected
through a universal connection 22 with the front 25
nectlons-is formed as a single central member
end of the main frame If to permit the rear end
of the draw-bar to be swung laterally of the ma
of box section; and the draw-bar, for substan
tially its entire length, is similarly formed. The
use of single box-section members for the longi
30 tudinal member of the draw-bar and for the front
portion of the main frame decreases materially
the respective widths of the main frame and
draw-bar at all points where their interference
might adversely affect the adjustment of the
35 blade in and to its “high-lift" position.
The accompanying drawings illustrate my in
vention: Figs. 1 and 2 are a plan and a side ele
vation respectively of a road grader embodying
my invention; Fig. 3 is a vertical transverse sec
40 tion on the line 3-3 of Fig. 2; and Fig. 4 is a
fragmental perspective view showing the blade
in its “high-lift” position.
As is clear from Figs. 1 and 2, the mad-grader
chine and the entire draw-bar to be rocked about
a vertical axis. For the purpose of controlling
the adjustment of the rear end of the draw-bar, 30
there are mounted near the outer ends of the
brackets l8 cranked lift-arms 24 the cranks of
which are universally connected to lift-links 25
and 26 whose lower ends are connected respec
tively to widely spaced points on the cross-mem 35
ber 2| of the draw-bar. Preferably, the outer
end of each of the cranks 24 is provided with a
rigid ball adapted to be received in a spherical
socket 21 in or near the upper end of the asso
ciated lift-link. For purposes which will become 40
apparent hereinafter, one of the lift-links, here
shown as the lift-link 25, is shown as provided
with two sockets for the reception of the ball
embodies front and rear axles H and I2 each
end of the associated lift arm, one socket 21 being
provided with laterally spaced wheels l3. A main
frame It extends between the axles II and I2,
located on the side of the link at a distance from 45
the connection of the main frame to the front
axle preferably being through the medium of a
at the extreme upper end of the lift link. Ball
and-socket connections may also be used between
the lower ends of the lift-links and the cross
member 2| of the draw-bar.
A third crank 30 mounted on a longitudinal axis
near the center-line of the frame has its free end
connected through a link 3| with some point on
the draw-bar, preferably a point near one end of
the draw-bar cross-member 2|. The link 3| is 55
ball-and-socket joint l5 to give the main frame,
in efiect,»a three-point support.
As shown in Fig. 3, the forward portion of the
main frame is formed of a single member of box
section. This member is conveniently built up
of two structural steel channels with their ?anges
55 abutting and welded together. The rear ends of
the rear are interconnected by a reinforcing plate
the end and the other socket (21') being formed
connected to the crank 30 and the draw-bar
through suitable universal connections, prefer
ably ball-and-socket joints as shown.
Mounted on the draw-bar is a ring 35 which is
adjustable about an axis normal to the plane of
the draw-bar and which, through the medium of
depending brackets l8,‘ carries the grader blade 31.
The means for controlling adjustment of the
two cranks 24 and the crank 30 may take any
10 desired form. In the particular grader shown in
the drawings, these cranks are arranged for ad
justment by power derived from a small internal
combustion engine 40 mounted near the‘ rear end
of the frame somewhat in advance of an oper
15 ator’s platform 42. Each of the cranks extends
rearwardly into association with gearing, the
gearing associated with the cranks 24 being dis
posed in casings 43, and the gearing associated
with the crank 30 being located in the housing 44.
20 Power for operating the gearing contained in any
of. the housings 43 and 44 is supplied from the
engine 40 under the control of suitable clutches
located in a control box 45 and selectively oper
able by control handles 46 mounted in the control
25 box 45 in position to be adjusted by an operator
‘ on the platform 42.
The angular position of the
ring 35 on the draw-bar may be controlled by
suitable gearing mounted on the draw-bar and
arranged to be supplied with power through a
30 suitable ?exible shaft 41 extending rearwardly
' to the control box 45.
When the grader blade‘ 31 is operating on a
surface approximately coplanar with that con
taining the rear wheels of the machine, the two
35 cranks 24 serve to control respectively the ver
tical position of each end of the blade, while the
lateral disposition of the blade is controlled by
the crank II. The three cranks, the’ links as
sociated with them, and the points of attachment
of the three links to the draw-bar are so arranged,
however, that the blade 31 can be swung from ,
its customary position beneath the frame to a,
vertical poution at one side of the frame, as
indicated in Fig. 4 and in dotted lines in Pig. 3.
In this position of the blade, the extreme narrow
width of the front portion of the main frame l4
and of the longitudinal member II of the draw 10
bar are of great advantage; for if these portions
of the structure had greater widths, they might '
interfere with each other and prevent the placing
of the blade in its vertical position. Further, the
reduction in the width of the draw-bar and main
frame increases materially the range and facility 15
of adjustment of the blade in and around its
vertical position.
_ I claim as my invention:
In a road grader, a main frame, a draw-bar 20
disposed beneath said main frame and having its
front end connected thereto through a universal .
connection, av scraper blade mounted on said
draw-‘bar, and means for adjusting the rear end
of said draw-bar laterally and vertically, said
means comprising a pair of cranks, bearings for
supporting said cranks for rotation about longi
tudinal axes spaced outwardly from and on op
posite sides of said main frame, and links con
necting said cranks respectively - with spaced
points on said draw-bar near the rear end thereoi'I
the radius of each crank being less than the dis
tance between its axis and the main frame, where
by each crank may be swung for a full revolution
about its axis;
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