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Патент USA US2408678

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Oct. 1, 1946.‘
- 2,408,671
Filed_ Dec. 1, 1943 -
3 Sheets-Sheet 1
Oct. 121946.
Filed Dec. 1, 1943
KSh'eets-Sheet 5
w/m.w4. “a”m
0 .v“
Patented Oct. 1, 1946
' *
Arthur Burnard McFarlane, Harrow, England,
assignor of one-half to Robert Lowe, Bexley
Heath, England
Application December 1, 1943, Serial No. 512,501
In Great'Britain November 23, 1942
3 Claims.
(Cl. 37—126)
This invention relates to bucket wheel scrap
ers including a wheeled bowl or bucket adapted
and are operatively connected to their respec
tive ends of the tail-gate, which are conven
to be hauled by a tractor, a blade or scraper at
iently in the form of roller carriages, by cables,
the lower front edge of the bucket passing earth
each cable passing over a guide pulley or sheave
positioned above the rear corner of the bucket
, and leading the cable from the longitudinal planes
in which the carriages move along the upper edges
of the bucket side walls on the one hand to the
thereinto under a movable apron during scrap
ing,_and a tail-gate ejector spilling the earth
from the bucket over the blade when required.
Bucket wheel scrapers at present in'use com
prise the rigid or-rear lift type in which the ver
transversely disposed axes of the springs on the
tical position of the blade or depth of cut is ad 10 other. The spring housings or casings may be
justed by altering the relative position of the
bracketed to the rear wall of the bucket either
bucket and rear wheels, and the articulate or
alongside each other or one above the other
front lift type in which the wheeled frame car- ~
or--especially where it is desired to take maxi
rying ‘the bucket is articulated to effect such ad
' mum advantage of the space available to provide
justment. Control by the operator on the tow
ing tractor is exercised through the medium
either of cables and/or a hydraulic system actu
springs of greater length and stroke than could
otherwise be accommodated within the overall
width of the scraper——the axes of the spring
housings may be oppositely inclined and stag
ating ?uid pressure cylinders on the scraper to
move the front apron, adjust the vertical posi
gered one behind the vother, a cable passing from
tion of the blade and bucket and actuate'the tail 20 the upper end of each spring housing to its guide
pulley aforementioned and thence to an arm up
The present invention is generally applicable
standing from its tail-gate carriage so as to ap
to all such machines, although primarily in
ply the desired compensating moment to'the car
tended for cable operated rigid or rear lift type
scrapers, and has for its principal object to pro 25 By utilising a pair of springs one connected
vide an improved construction inwhich the top
to each tailgate carriage in the manner speci?ed
of the bucket is open ‘and free from obstruction
' for effecting the tailgate return, individual ad
by the operating mechanism so that when desired
justment of their initial or pre-compression may
it may be loaded from say a drag-line excavator
be readily arranged and in' addition to the com
or other elevator, thus suiting the machine for
pensation' effected for the resistance encoun
carrying and spreading or dumping earth which
tered by the tailgate when pushing out the con
.has been loaded in this way in addition to its
tents of the bucket, by differentially adjusting the
normal dig and carry function as a scraper.
pre-compression of the respective springs so that
Further and favourable objects will appear
there is a, greater resistance opposing‘the initial
from the following description.
35 movement of the carriage on-that side of the
In accordance with the present invention a
bucket along which the tailgate operating cable
bucket wheel scraper including a wheeled bucket,
passes from the front of the scraper, the tend
a blade or scraper atthe lower front edge of the
ency of this carriage to move ahead of its com
bucket for passing dirt or earth thereinto under
panion may be countered and a smoothly run
a movable front apron, and a tail-gate ejector
ning tailgate ensured.
rfor spilling earth from the bucket over the blade
When applied to a rear lift type scraper, a rigid
when required, is characterised by the provision
yoke extends forwardly from the side walls of the
of'means for automatically returning the tail
bucket and is carried by the steerable wheeled
gate to its position at the rear of the bucket after
forecarriage and mounts a transverse A frame
ejection so connected to the tail-gate as to tend
for the sheaves over which passes the cable ac
to compensate or neutralise the moment produced
tuating the front movable apron, and it may be
by the resistance encountered, particularly by
also the tail-gate, such A frame being if desired
the lower part of the tail-gate, during ejection
of conventional form except that it is disposed
of the contents of the bucket, and so disposed as
well forward so as not to obstruct the open top
to leave the top of the bucket completely open 50 of the bucket between the top edge of the apron
and free from obstruction.
- ' i <
and the tail-gate.
Where a pair of coil compression springs is
The-invention will be further described with
employed to actuate the return mechanism, they
reference to the accompanying sheetsof explana
are conveniently housed in tubular casings ex
tory drawings which illustrate an embodiment by
tending laterally across the rear of the bucket 55 way of example, and in which
Figs. 1 to 3 show the preferred arrangement
where the tail-gate return mechanism is actuated
by springs extending laterally across the rear of
the bucket,
Fig. 1 being a side elevation of the preferred
Fig. 2 is a rear view, and
Fig. 3 a plan thereof.
Referring now to the drawings, I generally des
ignates the bucket having side walls? and Sbridged
relative disposition of the sheaves It] on the A
frame 9 and hinges 32 about which the apron I2
rocks, enabling the cable II to lift the apron to
a fully raised position in which the front of the
bucket is completely open when the contents of
the bucket are to be ejected by the tail-gate as
when the earth is to be spilled over the blade 30
while the machine is being used as a spreader, or
the apron may be set to any intermediate position
when the bucket is being loaded over the blade
at while the machine is being used as a digger or
at the rear by a structure 4, a rigid yoke 5 extend
ing forwardly from the side walls 2 and 3 of
40 represents the tail-gate proper which is
the bucket I and being carried by a steerable
formed of sheet metal and adapted closely to fit
wheeled forecarriage 8 at the foot of the pillar
6. ‘I indicates the road wheels of the steerable 15 between the side walls 2 and 3 of the bucket and
having its lower edge curved forwardly and
forecarriage 8 and I3 its tow-bar, which parts
adapted to scrape the bottom thereof during ejec
may be standard or conventional for attachment
tion, while normally, that is when the machine
to the towing tractor (not shown), although
is in use as a scraper, such tail-gate is positioned
preferably such forecarriage 8 mounting the
wheels ‘I comprises a rigid assembly-universally 20 within the bucket at the rear thereof against the
rear structure 4.
carried at the foot of the pillar E.
The sheet metal portion “Iii of the tail-gate
The rigid yoke 5 mounts in front of the bucket
depends from a transom 4| mounted on wheeled
a transverse A frame 9 for the sheaves IQ over
carriages 52 and 43 riding guideways provided for
which passes the cable I! actuating the front
movable apron I2, and this A frame may be 25 the purpose on the upper edges of the respective
side walls 2 and 3 of the bucket.
of conventional form except that it is disposed
well forward of the yoke 5 so as not to obstruct
the open top of the bucket I between the top edge
of the apron I2 and the tail-gate hereafter
‘I5 represents the rear wheels, of which there
are four, arranged in two laterally spaced pairs
at the rear of the bucket as more clearly shown
in Fig. 2, although two only single wheels may be
Such guideways are shown more clearly in
Fig. 1 and comprise upper tread sections 44 upon
which ride rollers 45 and 46 of the tail-gate car
riages. Lower treads are also provided with the
underside of which rollers 41 on the tail-gate
carriages £32 and 43 engage, so that any tendency
of the carriages to be derailed under the resistance
encountered by the tail-gate 40 during its forward
utilised, and I5 is the rear carraige, a fabricated 35 movement, is eliminated.
box structure webbed for its reinforcement, which
has arms II and I8 extending forwardly outside
Such forward movement of the tail-gate to eject
the contents of the bucket is effected by con
tinued movement of the cable II, preliminary
the bucket I and supporting same by means of
movement of which actuates the front apron I2
aligned trunnions I8, the rear lift of the rear
carriage It for adjusting the vertical setting or 40 and which, after traversing a sheave 50 on such
apron, returns to the sheave It at the head of the
height of the bucket 2 being effected by a cable
A frame 9 and passes thence under a guide pulley
29 passing over sheaves Or guides 2!, 22 and 23
III in the middle of the A frame, over guide pulleys
along one arm of the yoke 5 to a multiple sheave
5| and 52 carried by the yoke 5 and around pulleys
box 24 arranged externally 0n the rear structure ll '
of the bucket, and with which sheave box 24 co 45 53 and 54 on the transom of the tail-gate 40 and
operates a complementary sheave box 25 on the
rear carriage to give the required mechanical
advantage enabling ?ne and accurate adjustment
‘of the vertical position of the bucket to be effected
by the operator on the tractor via the cable 20. .
Large section pneumatic tires are utilised for
the road wheels and preferably as shown in Figs.
3 and 4 the front wheels I track with the outer
wheels of the pairs of rear wheels I5. In cases
where single rear wheels are utilised, the front
wheels ‘I would be arranged to track with such
single wheels.
thence forwardly along the offside of the bucket
to a sheave pulley 55 aligned with the guide
pulley 52 but on the opposite side wall of the
bucket, and then back to an anchorage 48 on the
transom III which also carries a spool 49 for spare
cable. Forward movement of the cable II thus
?rst raises the apron I2 and after lifting it to the
full extent to open the front of the bucket, im
parts forward movement to the transom AI and
tail-gate 40 to eject the contents thereof. ‘
The sheave boxes mounting the pulleys 5!, 52,
The bucket I is a folded and fabricated sheet
metal structure and its floor may be arranged
53, 54, 55, also each carry second pulleys over
which the cable II passes to give the requisite
mechanical advantage for accurate control of
with a wood ?lling and reinforced with a num
the tail-gate.
ber of webs rendering it strong enough to be
The transverse disposition of the transom 4|
and tail-gate 40 is maintained and smooth fore
and aft travel of the carriages 42 and 43 assured
loaded by an excavator when the machine is in
use as a dumper or spreader, and the cutting
which may be stepped or curved, is car
ried at the front edge of the floor beyond which
the side walls 2 and 3, which can be used to
carry scarifying teeth and side cutting blades
by rollers 38, 39 borne on vertical aXes near the
front and rear of each carriage and riding the
external vertical faces of treads on the side walls
2 and 3, while the forward limit of movement is
determined by stops 3'I projecting upwardly from
and which preferably extend forwardly on each
the side walls 2 and 3 and with which stops the
side of the front apron I2, being braced by a cross
70 front ends of the carriages abut.v
tube 3|.
It will be noted that, with the exception‘ of the
The front apron I2 normally obtrudes the
apron hinge pins 32, there are no working parts
open front of the bucket and as will be more
inside the scraper bowl or bucket, and that owing
clearly seen» from Fig. 3 is mounted for pivotal
to the forward curvature of the tailgate 40, the
movement between the side walls 2 and 3 on
hinge pins 32 near the upper edges thereof, the 75 bottom of the bucket is completely cleared dur
ing the forward movement of the tail-gate bythe
time the stops 3'! are reached.
The return or rearward movement of the tail
gate after ejection is effected in the embodiments
illustrated by coil compression springs and in the
preferred arrangement illustrated in Figs. 1 to 3,
As an alternative to the setting screws for pre
loading the springs, the springhousings or cas
ings may be furnished with telescopic ends screw
threaded or otherwise mounted on the casings so
as to be capable of adjustment to apply initial
compression to the springs.
these springs are housed in tubular casings 56
I Although the speci?c embodiment described
and 51 disposed laterally across the rear of the
employs compression springs for the automatic
machine above the rear wheel carriage It so
return of the tail-gate, it will be understood that
that the top of the bucket is left free and un 10 the invention is not limited in this respect since
other appropriate recoil mechanism could be uti
Two springs are preferably employed, each con
lised for the purpose such as ?uid pressure cylin
nected to its respective tail-gate carriage 42 and
ders similarly disposed to leave the top of the
43 in order that the resistance to forward move
bucket open and free from obstruction.
ment of each carriage shall be uniform and re
move twisting moment from the tail-gate, each
spring 58 being a facsimile of the other housed
within its casing 56 or 51 and actuated by a cable
60 at the olfside and BI at the near side of the
machine, the cable 66 passing over a guide pulley
62 at the rear offside of the machine from the
transverse axis of its spring 58 to the longitudi
nal axis of movement of its carriage 42, and the
cable 6| changing direction over a similarly dis
posed pulley 63 at the near side.
Finally, it will be appreciated that if desired '
the wheeled bucket may be arranged as a semi
trailer articulated to a self-propelled forecar
As the tail-gate is moved forwardly to eject
the contents of the bucket l, (by the cable II,
the cables 60 and 6| compress the springs 58 and
store energy therein for the return movement of
the tailgate when the cable I l is released, and
further, by reference to Fig. 1 it will be seen that
the cables 60 and Mara connected to arms 64
What I claim is:
1. A bucket wheel scraper including a wheeled
bucket, a scraper blade at the lower front edge
of the bucket for passing dirt thereinto under a
movable front apron, a longitudinally movable
tailgate ejector for spilling earth from the bucket
over the blade when required; a carriage adja
cent each lateral edge of saidv tailgate for the
support thereof, a rigid arm upstanding from each
carriage and a compressed resilient element ex
tending across the rear of said bucket and being
30 ?exibly connected to each rigid arm for automat
ically returning said tailgate to its position at
the rear of said bucket after ejection; said ?ex
ible connections being so related to said rigid
arms as to partially compensate for the moment
upstanding from their respective carriages with
the result that a counter-clockwise movement is
exerted on the carriages which compensates or 35 produced by the resistance encountered, par
neutralises the clockwise moment produced by
the resistance encountered by the tailgate 45
ticularly by the lower part of the tailgate during
during its forward movement in ejecting the con
ejection of the contents of the bucket.
2. A bucket wheel scraper according to claim 1
tents of the bucket.
wherein the compressed resilient element is a coil
As is shown more clearly in Fig. 3 the cable ' 40 compression spring housed in a casing extending
6| passes from the arm 64 over the guide pulley
63 mounted at the open end of the casing 51 and
then transversely inside the spring 58 to a fol
lower 65 between which and an abutment 66 with
in the casing 56 the spring is compressed as the
follower is drawn laterally by the cable during the
forward movement of the tail-gate. The pre
loading or initial compression of the springs 58
laterally across the scraper in rear of the bucket
and the ?exible connection is a cable extending
through the coil spring and having one end
thereof ?xed to the end of the coil spring and the
other end thereof ?xed to the respective rigid
3. A bucket wheel scraper according to claim 1
wherein the resilient elements comprise a pair
of compression springs disposed transversely of
which is necessary to ensure that the tail-gate
40 when released returns to the rear of the bucket 50 the scraper at the rear of the'bucket over the rear
and, it may be, laterally to stabilise it in its
Wheels and’ housed in casings and wherein the
movement, is effected by a screw adjuster 61 of
spring axes are inclined oppositely and. staggered
which one is provided at the closed end of each
one behind the other for the purpose speci?ed.
casing 56 and 51 and which through a slide block
68 applies initial compression to its spring 58 55
and enables the cable to be made fast to the car
riage arm 64 while the spring is so compressed.
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