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Oct. 1, 1946.‘ A. B. MOFARLANE - 2,408,671 ‘EARTH MOVING MACHINE Filed_ Dec. 1, 1943 - 3 Sheets-Sheet 1 0m. Oct. 121946. 2,408,671 A. B. MCFARLANE EARTH MOVING MACHINE Filed Dec. 1, 1943 KSh'eets-Sheet 5 WM 5.0T‘. DwnmnovQoNwo! 3m, 9. w/m.w4. “a”m m /u ‘ xn , . 6.N/H 6. a E M 0 .v“ 52,408,671 Patented Oct. 1, 1946 ' * UNITED STATES " PATENT OFFICE? 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. 7 (Cl. 37—126) 1 2 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 ,riage. 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 gate. 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 2,408,671 3 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 scraper,‘ 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 4 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 scraper. 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. V 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 described. - ‘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 blade 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 2,408,671 5 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, 6 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 obstructed. , 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 riage. 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 arm. ' 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 ARTHUR BURNARD MCFARLANE. and enables the cable to be made fast to the car riage arm 64 while the spring is so compressed.