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Патент USA US3027672

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April 3, 1962
3,027,662
E.‘ R. CUNNINGHAM, JR
COMBINATION MOTOR GRADER AND BULLDOZER
Filed July 25, 1958
3 Sheets-Sheet 1
INVENTOR.
ERNEST R‘ CUNNINGHAM JR‘
BY
LIN D BERG & BRADWAY
ATTO RN EYS
April 3, 1962
E. R. CUNNINGHAM, JR
3,027,552
COMBINATION MOTOR GRADER AND BULLDQZER
Filed July 25, 1958
5 Sheets-Sheet 2
39
92
93
53
F168,
INVENTOR.
E RNEST R. CUNNINGHAM JR.
F166
BY
Ll NDBERG 8. BRADWAY
ATTORNEYS
April 3, 1962
E. R. CUNNINGHAM, JR
3,027,662
COMBINATION MOTOR GRADER AND BULLDOZER
Filed July 25, 1958
5 Sheets-Sheet I5
INVENTOR.
ERNEST R, CUNNINGHAM JR‘
BY
LINDBERG 8 BRADWAY
AT TO RN EYS
aren't
a;
1C6
3,027,662
Patented Apr. 3, Iss2
1
2
3,027,662
or as a dozer, the blade being capable of being oriented
to selected positions whether the operation is as a patrol
COMBINATION MOTOR GRADER AND
BULLDOZER
Ernest R. Cunningham, .lr., P.0. Box 566,
Lihertyville, Ill.
Filed July 25, 1958, Ser. No. 751,005
14 Claims. (Cl. 37—180)
grader or as a dozer.
Yet another object is to provide linkages acting be
tween the tractor frame and a frame capable of move
ment with respect to the tractor frame, such linkages
enabling a dozer blade consisting of half portions to be
oriented to any desired position.
A still further object is to provide an improved dozer
This invention relates generally to grading equipment,
and particularly to improved equipment which can readily 10 having blade portions movable to selected positions by
be modi?ed for operation as either a patrol grader or
linkages acting between the tractor frame and an aux
a bulldozer. It may also be modi?ed for use as a port
able crane.
iliary frame capable of being locked in position with
The improved machine according to the present in
A further and important object is to provide a dozer
respect to the tractor frame.
vention preferably makes use of a wheeled tractor af 15 blade which can be moved laterally of itself with respect
fording a mounting for a pivot frame supporting a boom
to the tractor frame, the blade being also capable of
having a caster wheel at the forward end thereof in
angular positioning as well as movement endwise of
contact with the grade surface. The pivot frame sup
itself for grading to one side of the tractor.
ports essentially vertical gimbal mounted hydraulic cyl
inders, each being connected near the outer end of a
dozer blade.
Such dozer blade preferably consists of
two connected portions which are raised and lowered
by the aforesaid gimbal mounted cylinders. The ends
Other objects and important features of the inven
tion will be apparent from a study of the speci?cation
following taken with the drawings which together de
scribe and illustrate a preferred embodiment of the in
vention and what is now considered the best mode of
practicing the principles thereof. Other embodiments
plane by means of hydraulic cylinders having one end 25 may be suggested to those having the bene?t of the
of the each half dozer blade are moved in a horizontal
anchored to the tractor frame. The dozer blade is pre
vented from rocking about its longitudinal axis by tele
‘scoping members extending in the same general direction
as the last named hydraulic cylinders, each telescoping
teachings herein, and such other embodiments are in
tended to be reserved especially as they fall within the
scope and spirit of the subjoined claims.
-In the drawings:
member being connected to a link extending from a
FIG. 1 is an elevation view of a combination patrol
point near the outer end of the dozer blade portion and
grader and dozer according to the present invention;
to a point at the last named cylinder. The links have
FIG. 2 is a plan veiw thereof;
a moment taking connection to the blade portion, and
FIG. 3 is a front elevation view thereof;
the connection of the telescoping members to the links
FIG. 4 is a section taken substantially along the line
is likewise capable of taking moment, so as to main 35 4——4 of FIG. 2 looking in the direction of the arrows;
tain the blade portion in the desired attitude.
FIG. 5 is a longitudinal sectional view of the tele
Each inner end of the dozer blade portions is con
scoping member seen in FIG. 4;
nected to a hydraulic cylinder also connected to the
FIG. 6 is a view along the line 6—6 of FIG. 3 look
tractor frame, and these cylinders cooperate with the
ing in the direction of the arrows, showing details of
gimbal mounted cylinders and the other cylinders pre 40 a center post connecting the grader blade wing portions
viously mentioned to maintain the dozer blade portions
seen in FIGS. 1, 2 and 3;
in the conventional positon for blade grading, or in a
FIG. 7 is a section taken along the line 7-7 of FIG.
position at various angles to the tractor frame for angle
6 looking in the direction of the arrows, certain parts
grading. By reason of the last described hydraulic cyl
being shown in elevation, showing details of the center
inders, the blade portions can be positioned so as to 45 post and mounting for a center blade portion of the
describe a V for plowing, or as a V of opposite sense
grader blade seen in FIGS. 1 to 3, inclusive;
FIG. 8 is a section taken substantially along the line
to cause the blades to act as" an open bottomed load
8-—8 of FIG. 6 looking in the direction of the arrows,
carrying scraper. It is possible also to move the blade
showing how the center blade portion bears against the
endwise of itself with respect to the tractor frame, so
that grading can be carried on at one side or the other 50 wing portions seen in FIGS. 1 to 3;
FIG. 9 is a plan view showing how the grader blade
of the tractor.
consisting of the wing portions and the center portion
When the boom is removed, the pivot or tilting frame
can be placed in a straightaway canted position for angle
is locked to the tractor frame, and the gimbal mounted
dozing or grading;
cylinders as well as the other cylinders connected be
FIG. 10 is a plan 'view showing how the wing por
tween the blade portions and the tractor frame can op 55
tions of the blade can be positioned to provide a V-con
erate as described above, and the machine not only has
?guration wherebythe blade portions can operate as
the function previously described of a patrol grader, but
an open-bottomed load carrying scraper;
also the additional functions of a dozer.
HS. 11 is a view similar to FIG. 9, but showing
The boom can be extended or contracted as desired,
and it can also be raised or lowered as a crane boom, 60 the blade in a straightaway position of an opposite sense
with or without the caster wheel, for the placing of
underground pipe, poles, as desired.
from that seen in FIG. 9, the position shown being also
for angle dozing or grading; and
FIG. 12 is‘ a view showing how the blade portions
With the foregoing considerations in mind it is a prin
can be positioned to form a V of opposite sense from
cipal object of this invention to provide an improved
grading machine, capable of selective operation either as 65 that seen in FIG. 10, so that the dozer blade portions
a motor patrol grader or as a bulldozer.
can operate as a plow.
Referring now particularly to FIGS. 1 to 3 or" the
Another object is to provide a grading machine where
drawings, the improved grader and dozer according to
the blade is comprised of two portions which can be
the present invention is referred generally by the ref
positioned as desired both in vertical and horizontal di
70 erence numeral 20, and includes a wheeled tractor 21
rections.
having paired wheels 22 and 23. The wheels support
Still another object is to provide a machine of the
a tractor frame 24, ‘the tractor frame 24 in turn sup
class described for operation either as a patrol grader
3,027,662
3
4
porting an engine housing 26 enclosing a prime mover
(not shown) for driving the tractor 21. The wheels
22 and 23 may be powered dirigible wheels, and alter
with an upper bracket 77 turning freely on a central
mounting post 78, see FIGS. 6 and 7. The brackets
nately one pair of‘ wheels may be powered and the
other pair merely dirigible. It is also contemplated that
the tractor be of the type where steering is accomplished
by differential brakingof the wheels.
77 are also welded to the rear face of the blade portion
53, and similar lower brackets 79 are also welded to
the inner ends of the dozer blade. A bump pad 81 is
secured by a pin 82 to the center post 78.
It will be seen that the outer ends of the blade por
The tractor shown may also be of the crawler tread
type without departing from the spirit of the invention.
tions 53 determine the angular position of the blade
portions with respect to the frame 24. The cylinders
The tractor frame 24 is also provided with an opera 10 72 are connected to the inner end of the blade portions
tor’s seat 27, there being a control point 28 disposed
adjacent the operator’s seat 27, said control point sup
53 at the laterally spaced brackets 74 on the main frame
24, and are selectively operated to determine the posi
porting one or more controls 29 for operating various
tion of the inner ends of the blade. The connection of
elements of the grader and dozer.
the cylinders 72 at the inner ends of the blade portions
As shown in FIG. 1, the grader 20 is shown for opera 15 53, and their connection to spaced points on the frame
tion as a motor patrol grader. Irrespective of whether
24 constitute a three bar linkage which is a stable one
it is operated as a motor patrol grader or as a dozer, it
geometrically.
Since the cylinders 72 provide means for changing
the length of two of the sides of the three bar linkage,
in FIGS. 1 and 2, the pivot frame 31 has rigidly secured 20 it will be seen that the inner ends of the blade portions
53 can be selectively positioned with respect to the frame.
thereto a boom element 33 which supports telescoping
For example, both cylinders 72 can be extended which
boom elements 34, 36 and 37 to provide a boom 35.
will move the inner ends away from the frame’ 24, and if
Pin connections, such as shown at 38, maintain the boom
the cylinders 59 are retracted the blade portions 53 will
elements in their proper locked-up relationship. Pins
is'provided with a tilting or pivot frame 31, pivoted at
32 to the front end of the tractor frame 24.
As seen
38 may be; removed to shorten the boom 35, or the ele—
ments 34, 36 and 37 can be separated from boom ele
ment 33. The frontmost boom element 37 supports a
caster wheel 39 turning about an axle 41 supported in
swivel arms 42, swivel arms 42 turning in a horizontal
plane upon a vertical bearing 43 at the forward end of 30
adopt a position‘ corresponding to a V-grader as seen
in FIG. 12.
Retraction of cylinders 72 and extension
of cylinders 59 will give a position of the blade portions
53 as seen in FIG. 10.
the boom portion37.
The boom portion 37 has a plate 44 welded thereto,
Likewise, if one of the cylinders 72' is extended and
the other contracted, the inner ends of the blade portions
53 will be shifted laterally of the frame 24, such posi
tioning being indicated for grading to one side of the
the plate having an' eye 46 for supporting any suitable
machine, if desired.
The two blade portions 53 would normally leave- an
kind of lifting device when the boom is raised under
conditions as will be described.
35 opening therebetween, either when in the straightaway
The boom 35 together with its ground engaging wheel
39 cooperates with hydraulic cylinders‘ 47, each of which
has a gimbal mounting 48 to the pivot frame 31. Each
position as seen in FIGS. 9 and 11 or when in the V posi
tion seen in FIG. 12, except for the provisions of a spring
loaded center section 83, see again FIG. 6. The. center
cylinder 47 has a piston rod 49 which has a ball and
section 83 is formed from a curved plate having its upper
socket connection 51, see also FIG. 4, to an upper lug 40 end provided with bent down cars 84, 86 and‘ 87. The
52 welded tothe rear face of a grader blade wing por
bent down ear portions 84 and 86 are held pivotally to
tion 53. A pair of link arms 54, 54 are held between
center post '78 by a pin 88 which passes through the upper
the upper lug 52 and a lower lug 56 also welded to the
part of the center post 78.
rear face of the blade portion 53..
The center section 83 is urged against the blade por
The link arms 54 are spaced by a bearing sleeve 57, 45 tions 53 by a spring 89 having one end thereof bottomed
and a pintle pin 58 is supported within the sleeve 57 and
against the underside of center section 83 at the top
is anchored at its ends to the upper lug 52 and the lower
thereof, its other end being bottomed against a seat 91
lug 56. The other end of the link arms 54 is connected
on the bump pad 81. The movement of the center sec
to a ?uid motor shown as an hydraulic cylinder 59,
tion to the right as seen in FIG. 6 is limited by a stop 80
see also FIG. 2, piston 61 thereof having. a ball and
on the bump pad 81.
socket connection 62 thereat.
The lower edge of the center section 83 has a cutting
Any tendency of the blade 53 to turn about its longi
edge 92 with beveled edges 93, see FIG. 8, and the thrusts
tudinal axis is prevented by a cylindrical tube 63 welded
against the center section 83 and its cutting edge 92
at 64 to the upper and lower links 54. The tube 63
causes the same to come into ?rm contact with the blade
telescopes with a tube 66 of smaller diameter having a 55 portions 53 when the blades are in the position seen in
spherical bearing connection 68 at the end thereof remote
FIGS. 9 and 11. However, when the blades 53 are
from the blade 53, the connection 68 being to an abut
oriented to the position seen in FIG. 10, the cutting edge
ment 69 supported by the tractor frame 24.
A
92 can ride up over the blade portions 53 so as to close
In lieu of the telescoping cylindrical tubes 63 and‘ 66
the bottom of the V and thereby prevent spillage between
the telescoping members may be of rectangular cross 60 blade portions 53.
section if desired.
The operation of the‘mechanism thus far described is
The position of the outer ends of the blade portions
as follows:
53 with respect to the tractor frame 24 can be adjusted
The gimbal mounted cylinders 47 together with the
by the cylinders 59 which have a spherical bearing con
cylinders 59 and 72 can be adjusted so that the. grader
nection 71 to the abutment 69. Since the connection of 65 blade consisting of the wing portions 53 and the center
the cylindrical tube 63 to the links 54iis a rigid one,
portion 83 is in the straightaway position as seen in FIGS.
operation of the hydraulic cylinders 59 will determine
1 and 3. The cylinders 59 and 72 merely adjust the posi
the position of'the outer ends of the blade portions 53.
tions of the blade portions 53 in a horizontal plane and
The inner ends of the blade portions 53 can be ad
with respect to the tractor frame 24, while the gimbal
justed in their position with respect to the tractor frame 70 mounted cylinders 47 adjust the'position of the blade
24 by means of'?uid motors in the form of hydraulic
portions 53 and center portion 83 in a vertical plane. For
cylinders 72, one end of each cylinder 72 having a
ordinary grading‘operation the portions 53, 53'and 83
ball and socket connection 73 to a bracket 74 extending
are in thelsame horizontal plane either in the position‘at
inward from the tractor-frame 24, The piston‘ rod end
right angles to the longitudinal'axis of the grader 20, or
'of'each cylinder 72 has 'a‘ball and socketconnection 76 75 in'positions as'seen in FIGS: 9sand 11~for“angle'grading.
,; 3,027, 662
The gimbal mounted cylinders 47 can position the en~
tire blade with one end raised higher than the other for
frame for adjusting the position of the inner ends of said
wing portions in a horizontal plane, said ?uid motor
sloping if desired.
means and the spacing of their connections to said main
As seen in FIGS. 1 and 2, the caster wheel 39 and its
supporting boom 35 are held in position relative to the
blade portions 53, since all of the cylinders would be in a
condition with ?uid trapped therein. But the entire as
sembly can move in a vertical plane by reason of the piv
frame de?ning a selectively adjustable three bar linkage,
otal mounting 32 for the pivot frame 31. Large varia
tions in the condition of the grade at the caster wheel
39 will re?ect but small changes in vertical position of
additional ?uid motor means connected between each
wing portion at a point remote from the inner end there
of and said main frame for adjusting the position of the
outer end of said wing portion in a horizontal plane, and
means acting between said main frame and said wing por
tions for adjusting the position of said wing portions ver
tically.
the blade portions 53 and 83, so that the same essential
3. In a grading machine, a main frame having ground
grade will be had as that over which the wheels 22 and
engaging elements, a dozer blade, means. for adjusting the
23 operate.
position of said dozer blade with respect to said main
Under other conditions of grading it may be desirable 15 frame comprising ?rst ?uid pressure means acting be
to retract the inner ends of the wing portions 53 toward
tween each end of said blade and said. main frame for
determining the angular position of said blade with re
tractor frame 24 while the outer ends are extended away
from the tractor frame to give a V con?guration to the
spect to said main frame, and second means for adjust
ing the position of said blade both laterally and longitu
blade portions as seen in FIG. 10. Such may be indi
cated where it is desired to have grader 20 act as an 20 dinally of said frame comprising a pair of ?uid pressure
open-bottomed scraper.
motors each being connected to said blade at a point
thereon different from the point of connection of said
The apparatus thus far described can also be operated
?rst ?uid pressure means to said blade and each being
as a dozer at which time the boom 35 is removed or fully
connected to said main frame at a point spaced from the
retracted. The pivot or tilting frame 31 is then rocked
about the pivot 32 and is anchored to the tractor frame 25 place of connection of the other, said pair of ?uid pres
sure motors being selectively adjustable in length, and
de?ning with said main frame a stable three-bar linkage
for adjusting the position of said blade both laterally and
24 and also through an aperture 98 in the tilting frame 3-1.
longitudinally of said frame.
As before, the gimbal mounted cylinders 47 can raise
4. In a grading machine, a main frame having ground
and lower the blade portions 53 in a vertical plane, their 30
engaging elements, a frame mounted for tilting movement
position in a horizontal plane being adjusted by the cylin
in a vertical plane with respect to said main frame, a
ders 59 and 72. For operation as a dozer, the blade can
24 by‘ means of a'pair of pins 94 passing through an aper
ture 96 in an abutment member 97 on the tractor frame
be positioned as seen in FIGS. 9 to 12 inclusive, as well
as the positioning seen in FIGS. 1 to 3.
The apparatus thus far described can also be operated
as a crane with the blade portions 53 out of contact with
the ground. The upper link 54 has an car 99 with an
aperture ltil therein, and when the blade portions 53 are
raised by the gimbal mounted cylinders 47, the aperture
grader blade having wing portions hingedly connected at
their inner ends, means connected between each wing por
tion and said main frame for adjusting the position of
the outer end of said wing portion in a horizontal plane,
means connected between the inner end of each wing por
tion and said main frame for adjusting the position of
the inner end of said Wing portion in a horizontal plane,
101 can be aligned with an aperture 102 in a bracket 103 40 the points of connection of said last named means to
secured to the tractor frame 24, a pin passing through
the two apertures 101 and 102 to maintain the blade
portions 53 and 83 in an elevated position above the
ground.
said main frame being spaced from each other so that a
three bar linkage is de?ned with two of the links thereof
being independently adjustable to shift said grader blade
selectively in directions longitudinally and laterally there
During operation as a crane it may be desirable to 45 of, a boom held rigidly to said tilting frame including a
ground engaging element supported by said boom at a
turn the boom portion 37 through 180° and to mount a
point thereon remote from said tilting frame, and means
suitable lifting device at the plate 44 and the opening 46
acting between said tilting frame and said wing portions
therein. It will be apparent that the entire vehicle may
for adjusting the position of said wing portions vertically.
be freely manuevered as a crane with the blade out of
5. The invention as de?ned in claim 4 wherein means
contact with the ground, and the so-locked blade be 50
are connected between said wing portion and said main
comes an abutment for the operation of the gimbal
mounted cylinders 47 to pivot the tilting frame 31 about
its axis 32 to raise the boom 35 and lower it.
From the description foregoing, it is believed evident
that there has been provided a new and improved com
bination motor grader and dozer. While the apparatus
has been described in terms of a preferred embodiment
thereof, its scope is intended to be limited only by the
claims here appended.
I claim as my invention:
frame for preventing turning of said wing portion about
its longitudinal axis.
6. The invention as de?ned in claim 4 wherein said
55 wing portions are connected to a center portion.
7. The invention as de?ned in claim 6 wherein said
center portion is biased toward said wing portions.
8. In a grading machine, a main frame having ground
engaging elements, a frame mounted for tilting movement
60 in a vertical plane with respect to said main frame, a
grader blade comprising wing portions and a center por~
tion, means connecting the inner ends of said wing por
tions to said center portion, means for adjusting the inner
tions pivotally connected at the inner ends thereof, means
and outer ends of said wing portions in a horizontal plane
for adjusting the inner and outer ends of said wing por
tions in a horizontal plane comprising an adjustable three 65 comprising an adjustable three bar linkage connected be
tween the inner ends of said wing portions and said main
bar linkage connected between the inner ends of said
frame,
means connected between said wing portions and
wing portions and said main frame, means connected
said main frame for adjusting the outer end of said wing
between each wing portion and said main frame for ad
portion, a boom held rigidly to said tilting frame includ
justing the outer end of said wing portion, and means act~
ing between said main frame and said wing portions for 70 ing a ground engaging element supported by said boom
1. In a grading machine, a main frame having ground
engaging elements, a grader blade comprising wing por
at a point remote from said frame, and means acting
between said tilting frame and said wing portions for
2. In a grading machine, a main frame having ground
adjusting the position of said grader blade vertically.
engaging elements, a dozer blade including hingedly con
9. The invention as de?ned in claim 3 wherein means
nected wing portions, ?uid motor means connected be
tween the inner end of each wing portion and said main 75 are connected between each wing portion and said main
adjusting the position of said wing portions vertically.
7
8
frame for preventing turning of the wing portion about
its longitudinal axis.
position of said dozer‘blade with respect to said main
10. In a grading machine, a main frame having ground
said blade and said main frame, and second means for
engaging elements, a dozer blade including wing portions
hingedly connected adjacent their inner ends, means con
adjusting the position of said blade both laterally and
longitudinally of said frame comprising a pair of ?uid
nected between a wing portion and said main frame for
pressure motors, each being connected to said blade at a.
frame comprising ?rst ?uid pressure means acting between
adjusting the position of the outer of said wing portion
substantially common point thereon, and at a point spaced
in a horizontal plane, means connected between the
from the point of connection of said ?rst fluid pressure
means to said blade, said pair of ?uid pressure motors
inner end of each wing portion and said main frame for
selectively adjusting the position of the inner end of said 10 being each connected to said main frame at a point on
wing portion in a horizontal plane, said last named
said main frame spaced from the point of connection of
means and the spacing of the connection of each to said
main frame de?ning an independently adjustable three
bar linkage, and means acting between said main frame
the other of said ?uid pressure motors, said last named
pair of ?uid pressure motors de?ning with the portion
of the frame therebetween an adjustable stable three-bar
and said wing portions for adjusting the position of said 15 linkage.
wing portions vertically.
11. The invention as de?ned in claim 10 wherein
means are provided for preventing turning of said wing
portion about its longitudinal axis.
12. The invention as de?ned in claim 10 wherein said 20
wing portions are connected to a center portion.
13. The invention as de?ned in claim 12 wherein said
center portion is biased toward said wing portions.
14. In a’ grading machine, a main frame having ground
engaging elements, a dozer blade, means for adjusting the 25
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,997,001
2,078,294
2,502,681
2,698,096
2,698,491
2,730,823
2,891,334
Lamb ________________ __ Apr. 9, 1935
Stiehl et al. __________ __ Apr. 27, 1937
Swanson _____________ __ Apr. 4, 1950
Hughes _____________ __ Dec. 28,
Felt _________________ .._ Jan. 4,
Cassidy _____________ __ Jan. 17,
Kinzer ______________ __ June 23,
1954
1955
1956
1959
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