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Патент USA US3084471

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April 9, 1963
Filed Nov. 25, 1960
4 Sheets-Sheet 1
BY Mfg/ML,
April 9, 1963
J. J. Br-:cKFoRD
Filed Nov. 23, 1960
4 Sheets-Sheet 2
FIG. 4
FIG. 3
BY ¿Ajá
April 9, 1963
J. J. Bl-:cKFoRD
Filed Nov. 2s, 1960
4 sheets-sheet s
April 9, 1963
Filed Nov. 23, 1960
4 Sheets-Sheet 4
îinited States Patent G Mice
Patented Apr. 9, 1963
riser 36 and at their lower ends 37 to the top of C frame
31, at a point forward of the pivot 32, by means of a
.lames J. Beckford, Salt Lake City, Utah, assignor to The
suitable bearing mount 38.
It will be noted that the motor assemblies 33 are
Eimco Corporation, Salt Lake City, Utah, a corpora
mounted to be substantially vertical in the neutral posi
tion (FIG. l). This is important because it insures di
rect application of maximum power to the frame and
tion of Delaware
Filed Nov. 23, 1960, Ser. No. 71,263
3 Claims. (Cl. 37_144)
blade attachment during operation.
This invention relates to earth moving vehicles and in
particular to tractors equipped with a dozer blade.
It is a primary object ot' the invention to provide a
tractor-mounted blade which can be raised, angled in a
horizontal plane, and tilted from »the horizontal.
It is a further object to provide a structure of the type
described in which the blade tilting encompasses a wide 15
range from the horizontal thereby enabling deep digging.
It is a further object to provide a structure in which the
blade, despite its angled or tilted position may be acted
upon by a direct downward force for digging.
Attached to the forward bracket 39 of the C frame is
a blade support frame or plate 41 which is pivotally at
tached for angling by means of cooperating bracket mem
bers 42 and pin 43, the latter forming an axis about
which the frame is rotationally moved for angling. For
purposes of simplifying the description and claims this
axis Áis sometimes referred to as a first or vertical axis.
A bearing support block 44 is mounted on the rear of
the blade support frame 41 adjacent the bottom edge and
substantially centered between opposite frame ends. This
bearing block 44 serves as the center or pivot point for
It is a further object to provide a structure capable of 20 a dozer blade 46 mounted on the support frame 41.
exerting maximum force on the blade regardless of its
Opposite ends of support frame 41 are provided with
position relative to the ground; and it is an important
arcuate terminal edges 47 which are yformed to substan
further object to locate the blade-moving power sources
tially coincide with an arc described using bearing block
in a particular manner whereby maximum forces may be
44 as a center.
The dozer blade 46, which may be of conventional
construction and equipped with a suitable cutting edge
In apparatus of the type under discussion, the appli~
cation of down thrust is extremely important; and it is a
45, is pivotally mounted on the forward side of support
speciñc object of the invention to provide a structure in
frame 41 by means of stub shaft 48 permanently fixed to
which the motors for raising and lowering the blade are
the blade, as by welding, at a point midway between the
positioned to enable direct application of force. This is
blade ends and substantially below its horizontal center
of particular significance with respect to the positive down
line adjacent the bottom edge of the blade. The stub
thrust required to plow with a tilted blade.
shaft extends rearwardly from the blade longitudinally of
In order that the invention may be more readily under
stood and carried into effect, reference is made to the
the frame 31 and is received in a spherical or self align
are offered by way of illustration only and not in limita
tion since the scope of the invention is deñned by the
end plate 51 in turn fastened to the shaft by cap screws 52.
ing type bearing 49, being secured therein against relative
accompanying drawings and the description thereof which 35 movement by a pressed on tit and secured axially by an
appended claims and their conjointly co-operative equiva
lents rather than by any description preceding them.
In the drawings:
FIG. 1 is a side elevational view of a tractor embody
ing the invention, dotted lines being employed to show
various positions of the blade.
FIG. 2 is a front elevational view of the tractor of
Bearing 49 is journalled in cooperating bearing block
53 which is received and secured in the bearing support
block 44 on the support frame 41. The cooperating
40 bearing block 53 and inner member 49 are held in place
by a retainer such as washer 54 and screws 55.
The above described shaft and bearing structure pro
vides the pivot point for tilting of the blade, and yfor
simplification is sometimes referred to herein as the sec
FIG. l, dotted lines showing various positions of the 45 ond or horizontal axis. In order to support the blade
blade and certain parts being omitted or cut away for
there is provided a pair of spaced apart arcuate guide
purposes of clarity.
members 56 which overlap the arcuate end edges 47 of
FIG. 3 is a partial top view of a bifurcated frame by
which the blade attachment is mounted on the tractor.
the support Iframe and extend over a major portion of
the blade height to provide maximum support over the
FIG. 4 is a view taken in the plane of line 4_4 of 50 entire range of tilt.
FIG. 3.
Blade tilting is accomplished by means of a double
FIG. 5 is a rear elevational view of the blade support
acting piston and cylinder motor assembly 57 an end 58
frame and blade of the invention and may be regarded
of which is journalled in a self-aligning bearing 59 in a
as being taken in the plane of line 5_5 of FIG. 6.
bracket 61 adjacent the top of the support frame 41; and
FIG. 6 is a view taken inthe plane of lines 6_6 of 55 the other end 62 of which is similarly journalled in a
FIG. 5.
second bracket 63 mounted adjacent the top of the blade.
FIG. 7 is an end View of the blade and support frame
The two brackets 61` and 63 are spaced on opposite
take inthe plane of line 7_7 of FIG. 6.
sides of the center pivot in block 44 and act to tilt the
FIG. 8 is a sectional view taken in the plane of line
blade about such pivot while the support frame remains
60 fixed relative to the C frame.
8_8 of FIG. ‘6.
FIG. 9 is a sectional view of a bearing assembly em~
Angling of the support frame 41 and attached blade 46
ployed in the invention.
about vthe vertical pivot pin 43y (FIG. 5) is accomplished
In the embodiment illustrated, the invention is shown
by motors »64 (shown as double acting piston-cylinder as
mounted on a suitable track type tractor, generally desig
nated 34), by means of a forwardly extending C frame 65 semblies), mounted on opposite -legs of the C frame.
`Positioning of these Imotors 64 with respect to both the
member 31 that has its legs pivotally mounted, as at 32,
,C frame 31 and the blade support frame 41 is important
to the tractor sides to enable raising and lowering of the
Ifor proper operation. In this connection, it will be par
frame member and attached structure.
ticularly noted that the motors are mounted below the
Raising and lowering of the frame is accomplished by
hydraulic motor means which are provided in 4the form 70 top of the "C frame and also connect to the support frame
41 Iat a low point; and that the motors are substantially
of double acting cylinder and piston assemblies 33 piv
in line between the cutting edge 45 of the blade and the
otally secured at their upper ends 34 to a vert-ical frame
mounted one Von each side of said vehicle and extending
pivot point 32 at which the C `frame is mounted to the
Mounting the motors below the C frame permits con
nection of the Vertical motors 33 directly to the top of
forwardly thereof, .a second frame member adapted to
be mounted transversely of said first frame member ad
iacent the forward end thereof, means pivotally mount
In the embodiment shown, the angling motors `64 are
`frame member; an attachment for material handling, sec
the `C frame thereby enabling maximum application of Ul ing said second frame member to` said first frame mem
ber to enable rotational movement of the former about
force thereto with minimum structural components yet
a first axis extending from top to bottom of said first
utilizes maximum strength of the members.
ond means mounting said attachment to said second
frame member for rotational movement therewith about
secured at the piston end I66 to the `C frame by a self
aligning bearing 67 mounted in a recess formed in the
Asaid first axis and for independent rotational movement
bottom of the -C frame. The opposite, or cylinder ends
68, of the motors connect to the support frame 41 through
similar bearing assemblies 69 mounted in brackets 71
adjacent opposite ends yof lthe support frame. This is an
important feature as it protects the piston rod by insulat
ing it against the dirt and debris to which the piston rod
would be subjected if it connected to the support frame
41 adjacent the blade.
Itis important ythe motors 64 apply force to a low point
about a second axis substantially normal to said first axis,
said second means including pivotal mounting means in
terconnecting said attachment and said second frame
vmember at locations below their respective center lines
and below said means pivotally mounting said second
frame member to said first frame member, a first pair of
arcuate guide members lformed across substantially the
entire opposite ends of said second frame member and a
.on the support frame 41 to avoid warping of the struc 20 second pair of arcuate guide members located adjacent
_opposite ends of said attachment extending substantial
,ture when operating with the blade in a tilted position.
-ly from top to bottom thereof and being engageable with
Thus, the brackets 71 are mounted on the support frame
said first pair of arcuate guide members; and separate
at a location below the center line thereof and preferably
means enabling independent raising and lowering of said
near the horizontal plane of the second or horizontal cen
ter pivot point about which the blade rotates on tilting. 25 Áfirst frame member, rotation of said second frame mem
ber about said first axis and of said attachment about
This insures application of power as closely as possible to
isaid second axis, said separate means including first mo
the point of «greatest resistance and gives positive sup
tor means interconnecting said vehicle and said first frame
port against warping ofthe support frame and blade when
plowing furrows tor ditches with the blade at an extreme
and actuatable to» raise and lower said frame, second mo
to provide a -low center of rotation below the pivotal con
nection 43 of the support frame 41 to the -C frame 31,
said attachment and actuatable to effect rotational move
ment of said attachment about said second axis, and
tilt position. Location of the horizontal pivot shaft 48 30 tor means interconnecting said second frame member and
is also important for reasons of strength and also enables
a greater tilt to maximize the depth of digging with the
blade corners.
third motor means interconnecting said first frame and
said second frame to efi’ect rotational movement of the
35 latter about said first axis.
2. A material handling machine according to preced
As is best shown in FIGS. 1 and 2 the blade is mov
able through a wide range of positions as to both angle
ing claim 1 in which said first motor means comprises a
pair of hydraulically actuated piston and cylinder assem
and tilt or any combination thereof.
Obviously, the tractor may be driven and controlled 40 blies each connected at one end to a leg of said first frame
member and at the other end to said Ivehicle at a location
in any suitable well ‘known manner.
Also the various
¿forward of and substantially above the pivotal connec
double acting motors employed for blade control may be
powered in well yknown fashion as by pressure fluid sup
tion of said first yframe member to said Ivehicle.
3. A material handling machine according to preced
ing claim 2 in which said thirdmotor means comprises a
plied through a distribution center 75 connected to, mo
tors 57 and 64 from a suitable valve and hydraulic pump
pair of hydraulically actuated cylinder and piston assem
not shown, and suitable controls, such as 76. The lift
motor 33y may be similarly controlled.
In order to provide greatest flexibility and minimize
binding, all bearings by which motors 33, 57 and 64 are
connected to the structure should be of the` self-aligning
or spherical type as illustrated in FIGS. 8 and 9.
FIG. y9 is an enlarged sectional view of the spherical
bearing 69 by which the cylinder 68 is connected to the
blies each of which is secured at one end to a leg of said
Ifirst frame member at a loca-tion below the point of con
nection of said first motor means thereto and at its other
end to said second -frame member at a location adjacent
an end and below the center line thereof.
References Cited in the file of this patent
,blade support frame 41 `(cf. FIG. l). Such bearing as
.sembly comprises a shaft 70 extending between spaced
apart brackets 71., a partial spherical memberY 49 pressed
Birdr ________________ __ Feb. 19, 1935
Austin _______ __ _____ __ Nov. 16, 1943
on the shaft Iand a retainer `or bearing block 53 locked
Troop _______________ __ June 22, 1954 '
vin the eyepiece 77 of the cylinder end by suitable re
tainers ’78.
Dickinson ____________ __ Aug. 31, 1954
Nave _______________ __ June 12, 1956
Monk ________________ __ July 10, 1956
Long ________________ __ July 5, 1960
French ______________ __ Aug. 30, 1960
1. A material handling machine comprising. a vehicle,
a bifurcated first `frame member having its legs pivotally
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