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Патент USA US2133549

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0d. 18, 1938.
’
'
‘
Q LE BLEU
BULLDOZER
AND
THE
2,133,549
LIKE
Filed March 25, 1956
'
2 Sheets-Sheet 1
l
F'IG.
INVENTOR.
D_
y>
BY wall/b 22M“,
ATTORNEYS.
Oct. 18, 1938.
c. LE BLEU
2,133,549
BULLDOZER AND THE LIKE
Filed March 25, 1936
“xvi.
2 Sheets-Sheet 2
\m,
IN VEN TOR.
A TTORNEYS.
Patented Oct. 18, 1938
'
’ UNITED STATES
'
.
z,1\33,549
PATENT OFFICE
BULLDQZER
2,133,549
AND
mm
Charles Le Bleu, Los Angeles, Calif.
Application March 25, 1936, Serial No. 70,850
18 Claims. (01. lav-144)‘
This invention relates, generally, to earth han
dling devices, the term “earth” being taken in
'
face to be treated, 01' means adapted to be auto
‘the broad sense to include snow and the like, matically operatedby the pushing force ‘to swing
adaptedto be mounted on a vehicle to‘ be pushed ‘the device and adjust the working, relation of -_
the device to the surface to be treated'when the
thereby across a surface to be treated and in
cludes a- pusher frame mounted on the vehicle pushing force varies from a predetermined value.
and carrying a scraper forwardly thereof arid a
control mechanism disposed and adapted to “'op
erate automatically to adjust the workin rela
Another object of myginvention is the provi
sion in a device of the c aracter named adapted
to be mounted for vertical swinging movement on
a vehicle to be, pushed thereby across a surface
to be treated, of means adapted to be automati 10
10 tion of the scraper to the surface to be treated
when the pushing force of the vehicle vari s from
cally operated by the pushing force to swing the
a predetermined value.
device and adjust the working relation of the de-’
It is an object of my inventioh to prov de in a ' vice to thejsurface to be treated when the push
bulldozer, trailbuilder, snow plow ‘and he like
15 adapted to be pushed across a surface to be ing force varies from a predetermined value, and,
treated, a control mechanism disposed an adapt
ed to automatically operate when the
force varies from a given value.
?shing
‘
It is another object of my invention to provide
in a device of the character named adapted to be
pushed across a surface to be‘ treated, means
adapted to operate automatically when the push
ing force varies from a predetermined value to
adjust the working relation of the device to the
25 surface to be treated.
,
Still another object of my invention is the pro
vision in a device of the character named adapted
to be pushed across a surface to be treated, of
'30
in the art upon a detailed perusal of the speci
flcations in connection with the attached draw 20
ings wherein I exemplify and describe a pre
ferred embodiment of my invention, but it is to
be understood that my invention is susceptible
to numerous changes and modi?cations and that
such changes and modi?cations may be made in 25
the combination, correlation, and construction of
parts, members, and ‘features as do not constitute
means adapted to be automatically operated by
the pushing force to adjust the working relation
a departure from the spirit of the invention as
de?ned in the claims annexed hereto.
of the device to the surface .to be treated when
Figure 1 is a plan view of my invention, partly
the pushing force reaches a predetermined value,
and means to control the operative and inopera
tive positions of the device. /
v35
means operable at will to positively swing the
‘device.
Still other and further objects and advantages
of this invention will be apparent to those skilled
Still another object of my, invention is the pro
vision in a device of the character named adapted
to be mounted for vertical swinging movement
on a vehicle'to be pushed thereby across a sur
face to be treated, of means adapted to be auto
.40 matically operated by the pushing force to swing
the device and adjust the working relation of the
device to the surface to be treated when the push
ing force reaches a predetermined value.
Another object of. my invention is the provi
45 sion in a device of the character named adapted
to be pushed across a surface to be treated, 01'
means adapted to be automatically operated by
the pushing force, when said pushing force ex
Iri’the drawings:
,
"
'
I
,
‘
in section, mounted on a tractor of'conventional
design.
_
Figure 2 is a side elevation of Figure ,1.
Figure 3 is an enlarged view of a crank shaft
one of which is mounted in each of the longi
tudinally extending arms.
Referring now to the characters of reference
on the drawings,‘ the device includes a pusher
frame. designated generally as F comprising a
pair of side frames I 0 spaced apart and carrying 40
at their front ends’ a box like cross member H.
Each of the side frames l0 comprises'a hollow
boxed front section l2 open at its rear end-and
secured at its forward end to cross member H,
and a rear section-l3,'which I shall refer to as a
pusher arm, shiftably mounted in boxed section
I 2. A tractorof the track laying type of con
ceeds a predetermined value, to adjust the work- - ventional design is provided including track lay
ing relation of the device to the surface to be ing units l4 disposed one at each of the opposite .
treated.
,
sides of the tractor and pivoted at l5 for inde
Another object of my invention is the provi
pendent vertical swinging movement. Secured
sion in a device of the character named adapted to each of the track laying units is a pair of
to be mounted for vertical swinging movement brackets l6 carrying a trunnion l1, and, as shown,
- on a vehicle to be pmhed thereby across a sur
the rear ends of pusher arms l3 are swingably‘
2,133,549
2
mounted on trunnions 11. Thus it is seen that
a pusher frame F is secured to the tractor for
swinging movement in a vertical plane. As
shown, the forward and lower edge of the cross
member Ills provided with a scraper l9.
Mounted on each of the hollow boxed front
sections are bearings l9 having journaled therein
a crank shaft 29.
The front ends of pusher
arms l3 are each journaled on the crank pin
v10 portion 35 of the respective crank shaft 20. Dis
posed between the inner ends of crank shafts 20
is a shaft 2| joined at its opposite ends each to
the inner end of a crank shaft 20 by means of
keyways and keys 22, and sleeve couplings 23.
15 Carried by each of the sleeve couplings 23 is an
arm 24 extending rearwardly therefrom and pro
vided each with a plurality of openings 25.
Secured to each of the track frames 14 are
tnmnions 28 and 21, mountd on trunnions 26,
20 one at each of the opposite sides of the tractor,
are cantilever brackets 23. Pivotally mounted
on trunnions 21 are vertical links 29 pivotally
connected at their upper ends at 30 to cantilever
brackets 23. Thus, a cantilever bracket 23 is
25 mounted one on each of the track laying units.
Pivotally mounted on the forward end of each
of the cantilever brackets 23 at 33 is a hydraulic
jack 3| pivotally connected at their lower ends
each to an arm 24' at 36 as shown in Figure 2.
30 These jacks 3| are of conventional design com
prising in each a cylinder 32 and a piston and rod
assembly 34.
'
It will be noted that pusher arms l3 each are
provided with a pin 31 slidably mounted in slots
33 in the hollow boxed sections l2 the purpose of
which is to limit relative movement as between
the front and rear sections l2 and I3 respective
ly of side frames l0.
"
It will readily be seen that if ?uid undervpres- _
Thus it is seen that operating port 44 is con
nected in common by suitable conduit means, to
the upper ends of the pair of cylinders 32. In a
similar manner a conduit 55 is connected to op
erating port 45 and interconnected by means of
branch conduits 59 and 51 to the lower ends of
the pair of cylinders 32. Thus it is seen that
operating port 45 is interconnected by suitable
conduit means, to the upper end of the pair of
10
cylinders 32.
It is likely best explained at this point that
since the upper ends of cylinders 32 are inter
connected, and likewise that since the lower ends
of cylinders 32 are interconnected, a ?exible con
trol means is thus provided on each of the track 16
laying units whereby said track laying units may
freely swing vertically and independently of each
other and thus cause the fluid in the pair of
cylinders 32 to shift back and forth therebetween
to permit the track laying units to swing freely 20
and suspend the front end of the device parallel
to the horizontal axis H.
To raise the device by the operation of the
hydraulic jacks 3|, valve plug 49 is rotated
counterclockwise to register through port 41
with operating port 45 to direct fluid under pres
sure into the lower ends of cylinders 32 for rais
ing the device and at the same time register
side port 48 to exhaust the ?uid from the upper
ends of cylinders 32.
To lower the device by the operation of the
hydraulic jacks 3|, valve plug 46 is rotated clock
wise to register through port 41 with operating
port 44 to direct fluid under pressure into the
upper ends of cylinders 32 for lowering the de
vice and at the same time register side port 49
with operating port 45 and return port 43 to
exhaust the fluid from the lower ends of, cylin
ders 32.-
'3
>
-
1
-
_
‘A
The principal object of this invention is the
sure is admitted into the lower end of cylinders
32 and the upper endsof cylinders 32 are con ‘ provision in a device of the character described
adapted to be mounted on a vehicle to be pushed
nected to exhaust, then the piston and rod as
sembly 34 may be forced upwardly and thus the
thereby across a surface to be'treated, of an aux
forward end of the device maybe raised by iliary control means disposed and adapted to be
- automatically operated by the pushing force of
45 swinging the same in a vertical plane about the ' the vehicle,‘ when said pushing force varies from
horizontal axis at IT.
' .
It is also readily seen that if .?uid under. pres .a predetermined value, to adjust the working re
sure is admitted into the upper ends of cylinders ' .lation of the deviceto the surface to be treated.
The structure by which this end is'attained has
32 and the lower ends of'cylinders 32 are con
already been described and the operation thereof
nected
to
exhaust,
then
the
piston
and
rod
as
50
'
sembly 34 may be forced downwardly and thus will now be explained. .
Viewing Figure 2, assume the device to be in
the forward end of the device may be lowered by
swinging the same in a vertical plane about the scraping contact with the surface to be treated,
then the resistance thus offered to the advancing
horizontal axis at H.
'
movement of the device tends to shift the hollow 55
In
order
to
operate
the
hydraulic
jacks
as
de
55
scribed, I provide a pump P for subjecting ?uid boxed sections l2 rearwardly relative to pusher
to pressure. A conduit 39 is connected to the arms I3 and‘ since pusher arms I3 are connected
exhaust side of the pump-P‘ and to the intake at their front ends to the crank pin portion of
crank shaft 29 journaled on hollow boxed sec
port of a control valve 40; This valve is of con
tion I 2, then rearward shifting of boxed section
ventional
designvandincludesia
housing
4|
pro
60
vided with an intake port 42, a return port 43, l2 relative to pusher arm l3 will cause counter
and a pair of operating ports 44 and’45. Rotat I clockwise rotation of crank shaft 20 to which is
ably mounted in the housing. 4| is a valve plug 43 secured the arm 24 pivotally secured at its rear
provided with a through port 41 and a ‘pair of side end to the lower end of piston and rod assembly
34. Thus the said rearward shifting of boxed 65
'
65 ports 48 and 49.
A return conduit 50 connects through port 41 section l2 relative to pusher arm l3 and the re
with a ?uid reserve tank 5|. The control valve sulting counterclockwise rotation of crank shaft
being in the neutral position shown fluid may. 29 tends'to depress the rear end of arm 24, but
?ow from pump P via conduit 39 to the through since the rear end of arm 24 is connected to the
port 41 thence via conduit 50 into the reserve
lower end of a hydraulic jack and thus is pre- ' O
tank 5|. Connected to operating port 44 is a
conduit 52 having a branch portion 53 connected
to the upper end of one of the cylinders 32, and
a second branch conduit 54 connected to the
75 upper end of‘ the other of the said cylinders 32.
vented from moving downwardly, then the front
end of the device will be raised. Thus the work
ing relation of the device to the surface to be
treated is automatically adjusted by the pushing
force of the vehicle. Obviously when the de 76
2,133,649
vice has been thus raised to the point where the
pushing force required to push the scraper for
ward is less than the given value, the device will
cease to move upwardly and the device may then
move downwardly thus automatically seeking a
working relation to the surface to be treated
that will offer a constant value of resistance to
the advancing movement of~the device.
'
In a practical ‘embodiment of my invention the
10 relative effective lengths of the crank 58 and arm
24 is determined from a proper consideration of
the weight of the device and the pushing force
of the vehicle. Therefore, I have provided a
multiplicity of openings 25 in arm 24 whereby the
15 relative effective lengths of crank 58 and arm 24
may be adjusted to conform to the pushing force
of a particular vehicle whereby the working re
lation of the device to the surface to be treated
will be automatically adjusted when the push
ing force of the vehicle varies from a predeter
mined value.
Having thus described my invention, what I
3
movement to said pusher frame‘ and adjust the
scraper relative to the surface to be treated.
5. An earth moving machine comprising a ve
hicle, a pusher frameprovided with a scraper at
its front end and mounted atits rear end on the
vehicle for swinging movement in a vertical plane
and to be pushed by the vehicle across a surface
to be treated, said pusher frame being contract
able by the pushing force of the vehicle when
the pushing force reaches a predetermined value, 10
means to predetermine the‘value, and a crank
shaft disposed with the pusher frame and con
nected to the vehicle to be rocked by the con
traction of the pusher frame to impart swing
ing movement to said pusher frame and thus
adjust the scraper relative to the surface to be '
treated.
6. An earth moving machine comprising a ve
hicle, a pusher frame provided with a scraper at
its front end and mounted at its rear end on the 20
vehicle for swinging movement in a vertical plane
claim as new and useful and desire to secure by and to be pushed by the vehicle across a surface
to be treated, said pusher frame being contract
Letters Patent,. is:
able by the pushing force of the vehicle when the
1. In a device of the character described, a pushing force reaches a predetermined value;
pusher frame provided with a scraper at its front means to fix said value; a pair of hydraulic jacks
end and adapted to be mounted on a vehicle for
movement relative thereto and to be pushed mounted on the vehicle; a crank shaft mounted on the pusher frame; means connecting the hy
thereby across a surface to be treated, said push
draulic jacks and the crank shaft, said crank
er frame being contractable by the pushing force shaft
being disposed with the pusher frame to be
of the vehicle when the pushing force reaches a
predetermined value and extensible by the weight rocked by the contraction thereof to impart
of the device when the pushing force is less than swinging movement thereto and thus automat
the predetermined value, and means adapted to icallyadjust the scraper relative to the surface
to be treated; and means to operate the hydraulic
be operated by the contraction and extension of jack
for swinging the pusher frame.
the pusher frame to automatically determine the
horizontal working relation of the scraper to the
surface to be treated.
2. In a device of the character described, a
its front end and mounted at its rear end on the
_ pusher frame provided with a scraper at its front
‘end and adapted to be mounted on a vehicle for
and to be pushed by the vehicle across a surface
movement relative thereto and to be pushed
thereby across a surface to be treated, said push
er frame being contractable by the pushing force
of the vehicle when the pushing force reaches a
predetermined value and extensible by the weight
of the device when the pushing force is less than
the predetermined value, means to predetermine
the value, and means adapted to be operated by
50 the contraction and extension of the pusher
frame to automatically determine the working
relation of the scraper to the surface to be
treated.
3. In a device of the character described, a
pusher frame provided with a scraper at its front
end and adapted to be mounted on a vehicle for
movement relative thereto and to be pushed
thereby across a surface to be treated, said push
er frame being contractable by the pushing force
of the vehicle when the pushing force reaches a
predetermined value, and a crank shaft disposed
with the pusher frame and adapted to be rocked
by the contraction thereof.
4. An earth moving machine comprising a ve
hicle, a pusher frame provided with a scraper at
its front end and mounted at its rear end on the
vehicle for swinging movement in a vertical plane
and to be pushed by the vehicle across a surface
to be, treated, said pusher frame being contract
able by the pushing force of the vehicle when the
pushing force reaches a predetermined value, and
a crank shaft disposed with the pusher frame and
connected to the vehicle to be rocked by contrac
tion of the pusher frame to impart swinging
7. An earth moving machine comprising a ve
hicle; apusher frame provided with a scraper at
vehicle for swinging movement in a vertical plane
to be treated, said pusher frame being contract
able by the pushing force of the vehicle when the
pushing force reaches a predetermined value,
means for ?xing the value; a pair of hydraulic
jacksv mounted on the vehicle; a crank shaft
mounted on the pusher frame for limited rocking 45
movement; a pair of crank arms carried by the
crank shaft; means pivotally connecting the
crank arms each to a hydraulic jack; said crank
shaft being disposed with the pusher frame to be
rocked by the contraction thereof to impart 50
swinging movement thereto and thus automat
ically adjust the scraper relative to the surface
to be treated; and means to operate the hydraulic
jacks for positively swinging the pusher frame to _ .
raise and lower the scraper.
8. An earth moving machine comprising a ve
hicle, a pusher frame provided with a scraper at
its front end and mounted at its rear end on
the vehicle for swinging movement in a vertical
plane and to be pushed by the vehicle across 60
a surface to be treated, said pusher frame being
adapted for limited contraction by the pushing
force of the .vehicle when the pushing force
reaches a predetermined value; means to fix said
value; a crank shaft mounted on the pusher 05
frame for limited rocking movement; a pair of
crank arms carried by the crank shaft; a pair of
hydraulic jacks mounted on the vehicle; means
pivotally connecting'the crank arms each to a
hydraulic jack, said hydraulic jacks being oper
able to over-reach the limited rocking movement
of the crank shaft, said crank shaft being dis~
posed with the pusher frame to be rocked by the
contraction thereof to impart swinging move
75
3,188,549
4
ment thereto and thus automatically adjust the
scraper relative to the surface to be treated; and
means pivotally'mounting the front ends of the
pusher arms each on the crank pin portion of a
crank shaft, and means pivotally mounting the
means to operate the hydraulic jacks to over
reach the limited rocking movement of the crank rear ends of the pusher arms on the vehicle.
13, In a device of the character described, a
shaft and positively swing the pusher frame for
_ tractor, a pusher frame comprising collapsible
raising and lowering the scraper.
9. An earth moving machine comprising a trac
tor including a body and a pair of track laying
units disposed one at each of the opposite sides
10 of the body and journaled behind their front
ends to the body for independent vertical swinging
movement; a pusher frame provided with a
scraper at its front end and mounted at its rear
end on the track laying units for swinging move
ll ment in a vertical ,plane and to be treated, said
side frame elements and a transverse scraper
rigidly secured to the foremost of said collapsible
members, means pivotally connecting the rear
most of said collapsible members to the tractor,
means for positively raising and lowering the
side frame elements and scraper and for setting
the scraper in a determined position, and means
interposed between said raising and lowering
means and the foremost _members of the side
pusher frame being adapted for limited contrac- ' frames whereby _a force of predetermined value
tion by the pushing force of the tractor when the
pushing force reaches a given value; means to
fix the value; a crank shaft disposed with the
pusher frame forwardly of the track laying units
for limited rocking movement; a pair of crank
arms carried by the crank shaft one in front of
each of the track laying units; a pair of hy
draulic jacks mounted one on each of the track
laying units; means connecting said pair of crank
arms each to a hydraulic Jack, said hydraulic
Jacks being connected in common to a source of
?uid under pressure and operable to over-reach
the limited rocking movement of the crank shaft
and positively swingthe pusher frame to raiseand
acting to collapse the side frame members with
relation to each other will tend to raise the
scraper and frame with relation to the lifting
and lowering means, thereby adjusting the work 20
ing relation of the scraper to the surface to be
treated.
,
14. In a device of the character described, a
tractor having opposite track laying units there
on, side frame elements, each ‘comprising a pair of
side frame members assembled for relative limited
longitudinal movement, means pivotally connect
ing the rearmost of said members to the track
laying units of the tractor, a scraper disposed
transversely of the tractor and rigidly mounted
lower the scraper, said crank shaft being dis
upon the foremost of said frame members, a pair
posed with the pusher frame to be rocked by the
contraction thereof to impart swinging move
ment thereto and thus automatically adjust the
laying units, means articulately mounting said
brackets to their respective track-laying units,
scraper relative to the surface to be treated.
‘ 10. In a device of the class described, a scraping
unit, a pair of substantially spaced apart box
beams secured at their front ends to the scraping
unit, a pair of crank shafts journaled one in each
of the box beams, an arm carried by each of the
crank shafts and adapted at their outer ends for
connection to a vehicle, and a pair of pusher arms
shiftably disposed one in each of the box beams
journaled at their front ends each to the crank
pin portion of a crank shaft and adapted at their
rear ends to be mounted on the vehicle whereby
the scraping unit may be pushed across a surface
to be treated and the crank shafts may be auto
of cantilever brackets, one for each of the track
means acting between said levers and side frame
structures for raising and lowering the side frames
and the scraper, and means disposed between the
forward members of the side frame elements and
the said raising and lowering means whereby rela
tive longitudinal movement between the’,mem
bers of the side frames as produced by a resist
ing force against the scraper will act, auto
matically to adjust the scraper ‘with relation to
the raising and lowering means and the surface
to be treated.
41)
i 15. An earth working tool comprising a tractor
having track-laying units at the opposite sides
thereof, a frame structure for each track-laying
matically rocked to raise the scraping unit when . unit, said frame structure comprising a cantilever
articulately connected to the track-laying unit,
the pushing force applied by the vehicle reaches lifting
and lowering means carried at the free end
a predetermined value.v
_
~
11. An earth moving machine comprising a self
propelled vehicle, a scraping unit disposed for~
wardly of the vehicle, a pair of substantially
spaced apart hollow box beams secured at their
front ends to the scraping unit, a pair of crank
shafts Journaled one in each of the box beams,
an arm carried by each of the crank shafts, means
connecting the arms to‘ the vehicle, a pair of
pusher arms shiftably disposed one in each of the
box beams, means pivotally mounting the front
ends of the pusher arms each on the crank pin
portion of a crank shaft, and [means pivotally
mounting the rear ends of the pusher arms on the
vehicle.
12. An earth moving machine comprising a self
propelled vehicle, a scraping unit disposed for
wardly of the vehicle, a pair of substantially
spaced apart box beams secured at their front
ends to the scraping unit, a pair of crank shafts
iournaled one in each of the box beams, an arm
carried by each of the crank shafts, power oper
ated control means adjustably connecting the
arms to the vehicle, a pair of pusher arms shift
ably disposed one in each of the box beams,
of each of said cantilevers, a track frame ele
ment comprising a pair of members having hori
zontal movement with relation to each other, one
of said members being pivoted to the track-laying
unit, a scraper extending transversely of the trac
tor and rigidly supported at the forward ends of
the other of said members, means connecting the
forward ends of said members with the lifting and
lowering means, said means including structures
whereby resistance to movement of the scraper 00
blade will produce relative longitudinal move—
ment of the frame members and will simul
taneously lift the [scraper blade with relation to
the surface being treated.
16. In a device of the character described, a
pusher frame provided with a scraper at its front
end and adapted at its rear end to be mounted
on a vehicle for swinging movement about a
horizontal axis, and to be pushed thereby across
the surface to be treated, said pusher frame being 70
contractable by the pushing force of the vehicle
when the pushing force reaches a predetermined
value and extensible by the weight of the device
when the pushing force is less than the prede
termined value, and means adapted to be oper 'Il
2,188,549
ated by the contraction and expansion of the
pusher frame to automatically swing the same
about the said horizontal axis to determine the,
horizontal working relation of the scraper to the
surface to be treated.
17. In a device of the character described, a
vehicle, a pusher frame provided with a scraper
at its front end, means mounting the pusher
frame on the vehicle for swinging movement
10 about a horizontal axis, said pusher frame being
contractable by the pushing force of the vehicle
when the pushing force reaches a predetermined
value, raising and lowering means for positively
swinging the pusher frame about said horizontal
15 axis for raising and lowering the scraper, and
means interposed between said raising and lower
ing means and the pusher frame whereby a force
of predetermined value acting to contract said
pusher frame will tend to swing the same about
50 said horizontal axis and thereby adjust the work
5
ing relation of the scraper to the surface to be
treated.
18. In a device of the character described, a
tractor, a pusher frame comprising collapsible
side elements and a transverse scraper mounted
on the foremost of said collapsible members,
means pivotally connecting the rearmost of said
collapsible members to the tractor, means for
positively raising and lowering the side frame ele
ments and scraper for setting the scraper in a 10
predetermined position, and means interposed be
tween said raising and lowering means and the
foremost members of the side frames whereby a
force of predetermined value acting to collapse
the side frame members with relation to each 15
other will tend to raise the scraper and frame with
relation to the lifting and lowering means there
by adjusting the working relation of the scraper
to the surface to be treated.
CHARLES‘ LE BLEU. 20
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