US2553530A

US2553530A - Mobile scoop for lift trucks

Info

Publication number: US2553530A
Application number: US781945A
Authority: US
Inventors: Graves Lloyd Thurman
Original assignee: WILLIAM BLAYLOCK STEELE
Current assignee: WILLIAM BLAYLOCK STEELE
Priority date: 1947-10-24
Filing date: 1947-10-24
Publication date: 1951-05-15
Anticipated expiration: 1968-05-15

Description

May 15, 1951 1 T. GRAVES MOBILE SCOOP FOR LIFT TRUCKS 5 Sheets-Sheet 1 Filed 00t- 24, 1947 1 INVENTOR. Ly' Lloyd TAL/)722011 (,:raues ATTORNEY May 15, 1951 L.. T.-GRAvEs 2,553,530

MOBILE'SCOOP FOR LIFT TRUCKS Filed oct. 24, 1947 5 sheetsLsheet 2 INVENTOR. @dues ATTORNEY MalyA l5, 1951 1 T. GRAVES MOBILE SCOOP FOR LIFT TRUCKS 5 Sheets-Sheet 3 Filed Oct. 24, 1947 INVENTOR. /oj/a 7721.012101: Graves TTORNEY May 15, 1951 l.. T. GRAVES 2,553,530

` MOBILE SCOP FOR LIFT TRUCKS med ocr. 24, 1947 s sheets-sheet 4 May 15, 1951 T. GRAVES 2,553,530

` MoiLE scoop FOR LIFT 'mocks Filed oct. 24, 1947 5 sheets-sheet 5 INVENTOR.

S /oyd Thurman Grapes Patented May 15, 1951 L11-airis!)V VSTATES PATENT `OFFICE.

MOBILE SCOOP FOB, LIFT TRUCKS.

Lloyd Thurman Graves, North Vancouver, British Columbia, Canada, assigner, by direct and mesne assignments, of sixty-six and two-thirds per cent to William Blaylock Steele, Vancouver, British Columbia, Canada Application October 24, 1947, Serial No. 781,945

20 Claims.

l This invention relates to improvements in scoops, and particularly that character of scoop mounted for elevational movement and also for swinging movement about a transverse horizontal axis, and which is carried upon a tractor or other suitable vehicle to give the same mobility for the eifective handling and moving of dirt, rock, and other like materials. The procedure, in using a scoop of the character to which the present invention pertains, is to first position the scoop-bucket at 'a ground level and with the digging blade located horizontally. By the driving energy of the vehicle, the open maw of the scoop-bucket is then driven into a bed of the material being handled, moving forwardly in such degree as is necessary to pick up the desired load, following which the bucket is rst tilted upwardly to preclude spilling and is then elevated to a carrying height, the bucket being locked against a reverse swing while the vehicle moves to the desired point of discharge where the load is dumped by a disengagement of the lock to allow the bucket to swing downwardly by the weight of the load.

As a particular object, the invention aims to provide a highly efiicient bucket-elevating mechanism including aV vertically movable carriage and havingrecourse to a lift-chain as the medium for transferring to the carriage the energy derived from a hydraulic ram or other source of power.

It is a further and important object to apply this chain such that, in addition tothe performance of the carriage-elevating oice, the chain transmits to the bucket the energy necessary to accomplish the motion of tilting the same from loading to carrying position.

As a further corollary object, the invention aims to devise a scoop in which the chain, by force of energy derived from the activating motor,

operates to sequentially accomplish the steps,-

rst, of tilting the bucket and then raising the same. i

Other objects and advantages of the invention, concerned more especiallyl with the provision of a particularly simplified, easily operated, and trouble-free mobile scoop will, with the foregoing, appear and be understood in the course of the following description and claims, the invention consisting in the novel construction and in the adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawings:

Figure 1 is a fragmentary side elevational view with parts in section to illustrate a mobile scoop constructed in accordance with thepreferred embodiment of the present invention, the scoop- 2` bucket being shown by full lines in its lowered loading position and being also shown by dotted lines in an elevated dumping position.

Fig. 2 is a fragmentary view partly in elevation and partly in section to detail the head end of the telescoping frame and permit a full-line showing of the chain-receiving ro-ller and its frame mount` ing.

Fig. 3 is a horizontal sectional view taken to an enlarged scale on line 3-3 of Fig. 1.

Figs. 4 and 5 are fragmentary longitudinal vertical sectional views on lines 4--4 and 5 5, re` spectively, of Fig. 3.

Figs.,6 and '7 are views similar to Fig. 4 and Fig. 5, respectively, excepting that the parts are here shown in the positions which they occupy when the bucket has been tilted upwardly into load-carrying position.

Fig. 8 is a view which, likewise, is similar to Fig. 4 excepting that the upward tilt of the bucket has `been here carried'to a yet further degree, in which position the bucket is freed from the liftchain and swings downwardly as indicated by the direction arrow to dump the load.

Fig. 9 is a view showing the various operating parts in much the same positions as in Fig. 8 but with the released bucket having swung into dumping position.

Fig. l0 is a detail' fragmentary transverse ver-'- tical sectional view taken to an enlarged scale on line lll-I0 of Fig. 8.

Fig. 11` is a fragmentary view partly in side elevation and partly in section to detail the togglejointed arms which are made subject to a spring load in opposition to the lift force of the hydraulic ram and which function, after a dumping opera,- tion 'and when relieved of the restraint of Athe rams hydraulic energy, t0 return the tail extrem-Y ity of the lift-chain into the extended position in which it is shown in Fig. 4; and

Fig. 12 is a detail fragmentary horizontal sectional view taken to an enlarged scale on line l2--l2of Fig. '6.'

With reference being had to said drawings, the vehicle which forms a mobile mounting for the scoop is .indicated as being of that character providing two traction wheels '20 at the front and having a single steerable wheel (not shown) at the rear. An operators seat is shown at 2l, but other than for a steering wheel 22 and a tripcord serving a purpose hereinafter to be described, the controls which Vgovern the operation of the vehicle and the operation of the scoopbucket, and which are or may be conventional, are deleted from the drawing in order to simplify the illustration. The vehicle desirably presents a horizontal platform 23 extending forwardly from the operators station, and footing upon and made rigid with this platform is an upright cylinder 24 having hydraulic connection with a fluid pump driven from the engine of the Vehicle. A piston (not shown)A is. slidablyf received Withiri the cylinderfandfas't to this piston is a piston-rod projecting above the upper end of thevr cylinder and presenting a furcate extremity 26 accommodating the journal mounting of a sheave 21. The lift cylinderV might p erforce be of the displacement rather than the piston type,A Forward of the hydraulic cylinder and supported by the frame of the Vehicle the invention provides, pair of posts placed in spaced paralleling rela-V tion and each being of a telescoping nature cpm; prised of a stationary channel member "slidably connected therewith. As shown, the outerhaiinel 28 of each telescopically associated set of two is, the` stationary member" and the inner channel 2,3 ifsthefmoyable member, and these channels have their gutters'correspondingly directed with the slide connection being comprised of Vertiaced rollers, as 311;' carried by the back w'll, of one said channel member and received Q gutter of the other member to track upon the sidewalls of the latter. For securing'the one to the, other of said inner and movable channlrnembers to form aunit framework, the same are, connected top and bottom by cross-ties, and there fis'alsc provided adjacent -said bottom tie and "ezitendingacross the vback lflanges of lthe channelsan anglefiron 3|. This movable framewokhas hung from itsI head end and journaled in "a'l'l'anger- 32 a sheave 3.3. In rigidifying the stationary framework composed Vof the outer channel members4 28, the same are yoked by a brace34l to the head end ofthe cylinder 24, andY ei 'riding diagonally fromthe cylinder to the rmermet is astfrenmg strut 35. Y IThe invention provides two4 complementary lirftlchain's, one ofV which, designated 36, is anch'red by' oneend to. a chair 31 secured upon thestrut and, passing therefrom'over the sheave ljfeiter'ids by its other'end to the lower end of thel `sgi/ able framewerk whereat it'is secured tol the' angle-'iron' 3I`. Theother chain, denoted 33, is, anchored by one of its ends to a' Vcross-bar 40 fasti tolthevstfationary framework and from this anchor the; chain passes over thesheave 33 and" finds operative interconnection by itsfuother end tll'lebkeft. i u Erocee'ding now to describe this operative interconnection, the bucket, which I denote 4I,'is, provided Vat each side with 'af trunnion pin' 42l jbirnaled 'for"`swive1' action in cheek-arms 39 et'ending. forwardly from a U-shaped harness 4 3'. 'E Considered in side elevation, the back sidev of' the bucket has amore or less semicircular shape with the perimeter disposed concentric to theswivel axis of thebucket, andoverlying aparty of lthis concentric perimeter is ythe back wall 44v of the: harness. The, harnessr has transverse flanges 45 and 46 placed't'o'pand bottom of the back wall forv stiiening the latter, and there is Welded tov the back wall and to theiianges to occupy a` position central tothe width a'pair" of spaced.V plates: 4:1'. Received between these Yplatesj and'journale'd upon pins carried by the latter aref tandem-mounted' rollers 48, and passing under, these rollers and through a registeringl opening 50 of the harness back wall l44 isvthef.v

biiclyicterlgaging end of the chain 38. Complet?.- mail?? heiress Proper. and ,engaged byfpiifo pin 5l to serve as hangers for suspending the harness from a vertically movable carriage 52 are upstanding arms 53, and these arms, as with the plates 41, are made an integral part of the harness by welding the same to the back wall and to the flanges.

' The carriage, considered in front elevation, is of ageneral'ly rectangularv conguration and is on may be fabricated from four upright plates disposed in spaced paralleling relation and weldconnected'across the top and bottom by horizontal ties, The two inner plates, designated 58, are of somewhat greater width than the end plates and project rearwardly to overlie the inner facescfftlie: channel members 29 and for the purpose of'giving sliding support to the carriage these rear prolongations in each instance mount a pair of vertically spaced rollers 69 which work intheexgposed gutters of the channels. As will be seen from an inspection of Figs. 4 through 9, inclusive, the. several hanger-arms 53 and the plates '4 1 bear at their lower ends against the bottomv crosstie` of the carriage to transmit to, the, latter the thrust force of the bucket. It isv hereA pointed out that there is provided an angle-Y barl 5i made integral with the roller-carrying plates` 58, and secured to thisk angle-bar is a nor mallyinative fitting 6,2 to which the end of the chain 38 is` attached when thev vehicles loadhandling equipment isl comprised of a fork-lift rather than' theVV illustrated'scoop-bucket. The. purpose o f this fitting, in moreY partcularity, is to enable the; chain to beA attached directly to the carriagel and is used4 only when the bucket; @ed its harness., are replaced by the fork-lift ate tachment, the forklift being comprised simply. ofL two. L -Vshaped arms of which the upright ele-l ments of the Lv constitute, hangers and are at-v tached to thek pivot-pin 5|` and also bear upon thebottom cross-,tieA of the`Y carriage in substantially the same. manner as the hanger-arms 53. Rcvertingy to the bucketyand its harness,y to describertheoperating mechanism, a lug 63 is welded orotherwisfixedlysecured uponJthe frontal face of. theiiange 45 to'lie central to the width of the latter.' andfthrea'ueci threuglh this,` lug is, a set-v sicrewf54. iittedlwith,y theA usual jam-nut. Engagedy this setL-screwisfaibiloeck 65 mounted for vertical slide: movement between. stationary bars 66,

block are he d edbelts 6J Working in slots cut in thc @derving-511mg@ 51.16.10.19.65. is bifurcated, the bottnifand thesetting. issuch that the fleet.: 6 8,. thereby .descfiiblec'iv brfoughtL very nearly into touchingI ngagernentI vtt/Lith,'tl'fie,Y pe'rinfieter. of

the. bucket and; Such? 'more especially. as "ifilf rated frfi' dgsf tiene @legs having a @ii/etal. genhgiigsfvithteg becket @mdf being normally.: urged by the action of a leaf or coil spring '.'lA into alpesiiieilsxpvsedfbelandde@,buckets perimete nfaecom lishing its.bucl et.1folling function, the chain 33,1 1s,l caused. to eng-age.these dogs, being passlediorwardly fromthefrollersfd and the reg.-

istering'opening'. 50 through the intersticev de-V scribed between the .feet 68, andpresents upon itsv the ,inner y'seci-,imr'Hand 1the; latter. in turn lpivoted' up pressure applied upon the chain from the hydraulic motor, the armis normally extended by the action of a spring-pressed plunger 18 working only when the bucket has been tilted upwardlyY intosubstantially the position in which it is shown in Fig. 8. However, there is provided upon the bucket in laterally off-set relation to the dogs a stop-lug 80 and immediately before this tripping -action takes place such stop-lug is caused to be brought up against the pawl-nger 8l vof a lever 82 which is given a trunnion mounting, as-at 83, in pillow-blocks 84 bolted upon the frontal face of the harness. A spring 85 acts upon the lever to releasably hold the same against the stop, and for releasing purposes the trip-rope hereinbefore referred to, and designated 86, attaches to the outer end of the lever and extends therefrom to the drivers station of the vehicle. to its contact with the stop-lug, the pawl-nger of. the release lever is also caused, ata point in the rolling movement of the bucket, to lodge between double keepers 81 which are circumferentially removed from the stop-lug, the positioning of these keepers, more especially, being such that the pawl-nger nds engagement therewith when the bucket occupies the loading position in which it is shown in Figs. 1, 4 and 5.

Describing the operation of the scoop, and assuming that the-bucket occupies an elevated position and has been dumped (see Fig. 9), the procedure is to lower the bucket until the digging blade touches the ground and at the same time move the vehicle slowly in a backward direction. 'I'he bucket will then roll itself as the digging .blade levels off, and when so levelled the double keepers 81 will have been brought into registration with the pawl-nger to cause the latter to snap into a l locking position between the same. The operator holds the control lever of the hydraulic motor depressed and this allows the spring load of the plunger 'I8 to move the jointed arm into its extended position whereupon the pawl-block l2 falls into position ahead of the two dogs 10. With the parts so located, the operator can, should he so desire, lift the bucket to elevate the digging blade in such degree as a given work may require inasmuch as the lock precludes the bucket from rolling and any take-up upon the chain simply' elevates the bucket, its harness, and the carriage bodily. The nature of the hydraulic motor is such that the bucket will hold itself at any given height, a positioning of the motors control lever at neutral producing a hydraulic lock.

In working into the pile of material being handled, the machine need usually be driven forward only until the digging blade makes contact with the pile, the momentum of the vehicle then filling the scoop. yWhen the scoop has penetrated to its maximum depth, the trip-rope is pulled to withdraw the pawl-nger from the double keepers and the hydraulic motor is activated by a movement of its control lever to raise position, causing the chain to draw up. VThe bucket, being relieved of the pawl-ngers locking action, responsively rolls from its said loading position into the carrying position shown in Figs. 6 and 7, and

which is to say until thestop-lug 80 brings up In addition assenso@ againstthe pawl-finger, the trip-rope which con-` trolslever 82 having been released after the roll has progressed through a few degrees of travel. After the stop-lug interrupts the rolling movement, the bucket then starts to raise, and the hydraulic control lever is kept in its raise position until the desired height is reached, whereupon the vehicle'with its elevated load is moved to the dumping station, dumping being accomplished by simply pulling the release rope to disengage the pawl-nger from the stop-lug and` momentarily placing the hydraulic control lever in raise position to cause the bucket to roll through an additional few degrees of travel into the position of Fig. 8, with consequent depression of the dogs l0 freeing the same from the pawlblock.

It may be here pointed out that the bucket,

should it be so desired, can be dumped without transmitting thereto the tail-end roll necessary to bring the dogs intoengagement with the tripping feet 68, and this is accomplished by pulling on the release rope while at the same time quickly activating the hydraulic control lever to allow the bucket to fall sharply through a few inches of travel, this procedure permitting the weight load to jar the pawl-blockwhich, momentarily relieved of the draw force of the hydraulic motor, is kicked out of engagement with the dogs.

In stressing the machines versatility, it should, perhaps, be here reiterated that the carriage of the present invention forms a basic unit on which several attachments can be installed, thetwo mentioned attachments, and namely the scoopbucket and the fork-lift, being indicative. The machine is highly maneuverable, is extremely rugged in construction with unusually simple controls, and assures trouble-free operation even under the hardest usage.

The invention will, it is thought, have been clearly understood from the foregoing detailed description having particular reference to the i1- lustrated now-preferred embodiment, but it is self-evident that changes in details of construction may be resorted to without departing from the spirit of the invention and I therefore intend that the hereto annexed claims be read with only such restrictions as are expressly introduced thereto.

What I claim is:

l. In combination with a scoop-bucket having a swivel mounting and guidably supported for bodily .vertical movement of the scoop and its swivel mounting, a source of power, and a flexible link operatively interconnecting the power source with the bucket and acting to transmit to the latter energy responsible for both rolling the bucket about its swivel axis and to bodily elevate the same, the connection between the link and the bucket being a hooking connection.

2. In combination with a mobile vehicle, and a swivel-mounted scoop-bucket guidably supported by the vehicle for bodily vertical movement of the scoop and its swivel mounting, a source of power for giving traction to the vehicle and also for activating the bucket, and a flexible link operatively interconnecting said power source with the bucket and acting to transmit to the latter the energy responsible for both rolling the bucket about its swivel axis and to bodily elevate the same, the connection between the link and the bucket being a hooking connection.

3. In combination with a carriage guidably 15: supported'for vertical movement, and a swivelaenaca riagaa. source of power, manually released means for-locking the bucket in a loading position, and powered means engageablewith the scoop-bucket and operable when said lock is released and acting automatically in response to an energizing of the power source for sequentially transmitting. to the bucket and to the carriage. an. energizing forcey operative rst tov roll the bucket from said loading position into. a, load-carrying position and then to elevate the. rolled bucket.

4. In combination, with a carriage guidably supported forl vertical movement, and a swivelmounted` scoop-bucket supported by said carriage: and providing a` digging. blade adapted when.

loading to. occupy a level position and arranged by swivel movement of the bucket to be tilted l upwardly* or downwardly into either aV load-carrying. or a dumping. position, respectively, a source of power, a. draw-link. activated from the. power source and arranged to be releasably connected with the bucket for rolling the bucket into its said` load-carrying position, and means acting? automatically by a de-energizing ofi the power source, and. when the bucket` occupies its loading position for bringing the draw-link into said connection with the bucket.

5,. The structure of claim 4. in which the means" last recited comprises an extensible arm. composed of jointedsections.

6. In. combination with a carriage guidably supported for vertical movement, anda swivelmounted scoop-bucket supported. by said carriage and providing: aV digging' blade adapted when loading to. occupy a, level position. and arranged by thev bucketsswivel-movement tobe tilted up:- wardly'or downwardly intov either a load-carrying or a load-dumping position, respectively, means for releasably locking the bucket. in said loading position, a stop engaged by the bucket in its upward tilting rrrovernent, a motor, anda drawline connection from. the motor. to the bucketl operating whenY the bucket' is released upon' an energizing of the motor to first roll' the bucket into its said load-carrying position and then, as' the roliing movement isinterrupted by theV stop, bodily'el'evating the bucket and. its carriage.

7. In combination witir a carriage guidably' wardiy' to. the roller.` andY thence under.' the latter'V and horizontally over thebucket, said draw-line;

upon an energizing; of.l the motor, actingilrst'to` rollthe bucket; and. then, as the rolling movement' is interrupted by the stop, bodily elevating thel bucket and its' carriage;

8. A mobile scoop. comprising, in combination with a self-energized vehicle:

by the movable element of said telescoping framework forI vertical movement.l ini relation thereto,- a. swivelr-mounted scoop-bucket.' sup;-

a. telescoping" framework carried upon the vehicle to' occupy' a.. vertical position, a carriage guidablyisupported ported by the carriage and providing a digging blade adapted when loading` to occupy a level.

position and arrangedv by swivel movement of the bucket to be tilted upwardly or downwardly into either a load-carrying or a dumping position, respectively, a hydraulic motor upon the vehicle comprised ofi an upright cylinder and a piston working inv the cylinder, apiston-rodfast to the piston and exposed by its upper .end beyond the head end of the cylinder, a chainhandling sheave carried by said. exposed end, a second chain-handling sheave carried upon the head end of the movable telescoping element, a looped chainv anchored atl one end to thevehicle with its bite passing over the rst-named sheave and having its other end connected to the lower end of said. movable telescoping. element, and a second looped chain anchored at one end. to the head' end of the stationary telescoping element 2o: with its bitev passing over the second-named sh'eavey the other end of the second said chainbeing adapted' to be connected withv the bucket for both rolling and elevating the latter.

9. A mobile scoop comprising, in combination with: a self-energized vehicle: a telescoping up\ right framework carried upon the vehicle, a carriagev guidably supported by the movable element of. said framework for vertical movement in relation thereto, ai swivel-mounted scoop-bucket supported bythe carriage` and providing a dig-e ging. blade adapted whenY loading to occupy a level. position and: arrangedt by swivel movement oi the bucket to be tilted upwardly or downwardly intof either. a, load-carrying.- or` a dumping posi- 1 tion, respectively, a stop engaged by the' bucket in: its upward tilting movement,A a` hydraulic motor uponthe vehicle comprised' of an upright cylinder: andi a. piston working in the: cylinder,. a piston-rod' fast toY the piston and exposed by' its upper` endi beyond the head end of the cylinder, a sheave carried. by said exposed end, a second sheave carried upon the head end of the movable t'elescopi'ng; element, a chain anchored at. one: endA to thefvehiclei and passing over the first-named; sheave with@ its: other end connected to: theY lower.' end of. said.` movable telescoping; element;Y and a; secondchainfanchored.at ones-endto.l the. head end of the stationary telescoping. element and passingV over the second-named' sheave with its: other.- end operatively interconnected withthefbucketfor rstirollingthe bucketfrom the lattersr loading: position. into said'I loadcarrying position-.and then, as' the rolling. movement is'interruptedzby the. stop, bodilyl elevating the. bucket andi thefc'arriaga 1i0. Mmobileload-handiing machine compris:-

ingimcombinatlon with' .ai self #energizing vehicle;

frameworkisupporte'dtol occupy." a vertical po'- sitiontuponthevehicle, a, carriage guidably supporte'dl by.l the framework'fori vertical movement in relation thereto;.ascoop-bucket supported by' the! carriagei andi swivel-mounted' for movement from'fa central Xloadingipositioninto twoiextremes of oppositely directed. rolling.v travel, manually" "11. In combination with a carriage, and a framework guidably supporting said carriage for vertical movement'and upon its head'end carrying Va, sheave, a swivel-mounted scoop-bucket supported by said carriage and providing an integral digging blade adapted when loaded to occupy a level position and arranged by the buckets swivel movement to be tilted upwardly or downwardly into either a load-carrying or a loaddumping position, respectively, a retractable pawl lhaving a localized mounting in relation to the carriage, a roller also having a localized mounting in relationto the carriage, said bucket being provided with a keeper arranged to engage said pawl and releasably lock the bucket when thebucket occupies its loading position and also presenting a stop-lug engaged by the pawl when the b-ucket is swung upwardly into load-carrying position, a motor, and a draw-line leading from the motor over said shcave and running downwardly therefrom to pass under the roller and thence horizontally over the bucket into operata release of said lock, being rst rolled by the vdraw-line from the loading into the load-carrying position and then, as the rolling movement is interrupted by the stop-lug, being elevated bodily with the carriage.

l2. In combination with a carriage, and 'a framework guidably supporting the carriage for vertical movement, a harness pivotally hung from ing engagement with the latter, the bucket, upon x the carriage and at its lower end bearing against f the harness to occupy an interruptive position inthe path of movement of the keeper and the pawlv and acting, when the bucket occupies its loading position, to engage thekeeper for releasably locking the bucket and, when the bucket is rolled upwardly, to engage the stoplug, a bucket-operating motor and a draw-chain leading from the motor and extending downwardly to the roller to pass under the same and thence forwardly over the bucket into operating engagement with the latter, the bucket, upon a release of the lock, being rst rolled by the drawline and then, by an interruption of the rolling travel, elevated bodily with the harness and the carriage.

13. In a load-handling machine and in combination with a carriage, and a framework guidably supporting .the carriage for vertical movement, a harness pivotally hung from the carriage and its lower end bearing against the carriage for resistance to horizontal thrust, a scoop-bucket trunnion-mounted in the harness for swivel movement from a neutral loading position into two extremes of oppositely directed rolling travel and formed with a curved back wall the perimeter of which lies concentric to the swivel axis, a roller journaled upon the harness in rearwardly spaced relation from the bucket, a keeper and a stop-lug disposed in aligned spaced relation within a circumference of said buckets back wall, a retractable pawl carried by the harness to occupy an interruptive position `in the path of movement of saidkeeper and the pawl and acting, when the bucket occupies its 10,` loading position, to engage the keeper for releasably locking the'bucket and, when the bucket reaches a point short of the upper extreme of its rolling travel, to engagethe stop-lug for interrupting the rolling travel, a depressible dog also carried upon the back wall of the bucket, a bucket-operating motor, a draw-chain activated by the motor and running downwardly to and passing under the roller wherefrom the tail end extends forwardly over the bucket, a connector upon said tail end of the chain arranged to be releasably engaged with the dog, an extensible arm carrying said connector and operatingwhen extended to bring the connector'into engagement with the dog, spring means for extending'said arm, and means operative upon motor-activated movement of the bucket to the upper extreme of its rolling travel for depressing said dog to free said connector. V

14.The structure of claim. 13V in which the carriage serves as a basic mounting applicable to a severalty of selectively used load-handling attachments and wherein said carriage provides a coupler lwhich is inactive in the use of the scoop-bucket but which permits the alternative attachment of the tail end of the draw-chain directly to the carriage when the employed attachment requires a lift force only.

15. A mobile load-handling machine comprising, in combination with a self-energizing vehicle: a` telescopingupright framework carried upon .thevehicle to occupy a position at the front end thereof, a carriage guidably supported by theV movable elementof said telescoping framework forvertical movement in relation thereto, aharness pivotally hung from the carriage with its lower end bearing for horizontal thrustv against the latter and presenting forwardly directed cheek-arms, ja scoop-bucket trunnionmounted in the cheek-arms for swivel movement between the two extremes of oppositely directed rolling .travel and formed with a curved back wall the perimeter of which lies concentric to the swivel axis, a roller carried by the harness to-lie in rearwardly spaced relation from .the bucket, a pivoted lever also carried by the Vharness and providing a pawl, a spring ,acting upon saidlever to normally urge the pawl into bearing engagement against the back wall of the bucket, a `manually-operated trip-rope connected with the lever for retracting the pawl, a depressible dog carried upon the back wall of the bucket, a double-keeper and a stop-lug also carried upon the back wall of the bucket and placed the former to engage the pawl and releasably lock the bucket when the bucket occupies a position more or less central to its two extremes of rolling travel and the latter to engage the pawl Vand interrupt the vrolling movement of the bucket at `a point short of the upper extreme of its travel, a hydraulic motor, a draw-chain activated by the motor and running downwardly to and passing under the roller' with its tail end extending forwardly over the bucket, a connector upon said tail end of the chain arranged to be releasably engaged withthe dog, an extensible arm carrying said connector and operating when extended and upon a positioning of the bucket in its said central location to bring the connector into engagement with the dog, a spring acting to extend said arm, and means operative upon motor-activated movement of the bucket to the upper extreme of its rolling travel for depressing said dog to free said connector.

16. In combination with a harness, and with 1l a scoop-bucket trunnion-mounted in the harness for reciprocal rolling movement about the center of the trunnions as an axis, the mechanism for rolling the'buoket and which comprises a retractable pawl supportedV by the harness, a dog carried upon the perimeter of the bucket, a keeper also carried upon the perimeter of the bucket and acting to engage the pawl and releasably lock the bucket when the bucket occupies one position of its rolling travel, a motor, .a draw-link powered 1 trom the motor and placed more or less tangent to the bucket and upon-its tail end carrying a connector arranged to be releasably engaged with the dog, an extensible arm carrying said connector and by its extension acting to bring the conhector into engagement with the dog upon a location of the bucket in its said keeper-locked position, and yielding means acting to extend the arm but arranged to be overpowered by the force of the motor.

17. In combination with a harness, and with a scoop-bucket trunnion-mounted in the harness for reciprocal rolling movement about the center of the trunnions as an axis, the mechanism for rolling the bucket and which comprises a retract. able pawl supported by the harness, a depressible dog carried upon the perimeter of the bucket, a keeper and a Stop-lug also carried upon the perimeter o f-the bucket and placed the former to` engage the pawl and releasably lock the bucket when the bucket occupies one position of its rolling travel and the latter to engage the pawl and interrupt the rolling movement of the bucket at another point in its -rolling travel, a motor, a

draw-link powered from the motor and having its tail end placed more or less tangent to the bucket, a connector carried upon the tail extremity of said link and arranged to be releasably engaged with the dog, an extensible arm carrying said connector and by its extension acting to bring the connector into engagement with the dog upon a location of the bucket in its said keeper-locked position, yielding means acting to extend the arm but arranged to be overpowered by the force of the motor, and means operative upon a travel of the bucket beyond the interrupted point at which thepawl engages the stop-lug for depressing said dog to free the connector.

18. VStructure according to claim 3 in which the carriage admits of having either the scoopbucket or a fork-lift supported thereby, and wherein the carriage has a tting thereon inactive to the powered means when the scoop-bucket is used and which allows the powered means to be coupled directly to the carriage when the forklift is used.

19. A mobile scoop comprising, in combination with a, mobile mounting, a carriage mounted for vertical movement thereon, a transverse horizontal pivot shaft supported by the carriage to occupy a position adjacent the top end of the latter, a harness hung from said pivot shaft, and a scoopbucket swivel-mounted in said harness with its swivel axis located below and in outwardly spaced relation from said pivot shaft, the carriage and the harness being so formed as to cause the pendant portion of the harness, when subjected to an end thrust in course of pushing the scoopbucket into material which is to be loaded, to take a bearing seat against the lower end of the carriage.

20. A mobile scoop comprising, in combination with a mobile mounting, an upright standard supported by the mounting, a carriage guided for vertical movement by the standard, a horizontal pivot-shaft supported by said carriage to occupy a position adjacent the top end of the latter, a harness hung fro-m said pivot-shaft, a scoopbucket swivel-mounted in said harness with its swivel-axis located below and in outwardly spaced relation from said pivot-shaft, and power means for rolling the scoop-bucket about its swivel axis.

LLOYD THURMAN GRAVES.

REFERENCES CITED The following references are of record in the lile of this patent:

A UNITED STATES PATENTS` Number Le Tourneau Apr. 6, 1948