US2541045A

US2541045A - Material moving apparatus

Info

Publication number: US2541045A
Application number: US535706A
Authority: US
Inventors: Ferwerda Ray; Ferwerda Koop
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-05-15
Filing date: 1944-05-15
Publication date: 1951-02-13
Anticipated expiration: 1968-02-13
Also published as: US2772011A

Description

Feb. 13, 1951 R. FERWERDA ETAL 2,541,045

MATERIAL MOVING APPARATUs Filed May 15, 1944 5 Sheets-Sheet 1 FIG. 1

IN VENT ORD.

RAY F E RWERDA mm KoopFERwERDA, BY

Wham

ATTORNB Y-S.

Feb. 13, 1951 R. FERWERDA ET AL 2,541,045

MATERIAL MOVING APPARATUS aim '- INVENTORS.

Rm Fm WERDH mw KnoPmgwzn /r,

BY 0 ATTORNEYS.

Feb. 13, 1951 R. FERWERDA ET AL 2,541,045

MATERIAL MOVING APPARATUS Fla-4- F-Wets INVENTORS.

RAY FERWERDA mm KooP Fsxwmnn,

AT TO R NETS Feb. 13, 1951 FERWERDA ET AL 2,541,045

MATERIAL MOVING APPARATUS Filed May 15, 1944 5 Sheets-Sheet 4 m INVENTCRS. i RAg FERWERDfl nno KOOP FERWERDA,

ia wm 3 W AT T ORNEYS.

1951 R. FERWERDA ETAL 2,541,045

MATERIAL MOVING APPARATUS Filed May 15, 1944 5 Sheets-Sheet 5 1N VENTOR RAY FERWERDA mm KQOPrERWERDA,

W ELMOQIM ATTORNEYS i atenteci eh. 13, 195i liayiFerwerdaiand Keep; Ferwerda;

Lake --I.!ucerne ,0hio

App1ieatio1r*May'-15 1944, Serial No. 535,706

16 Claims; (Olefin-P132) This inventionas indicated, relatesto aimatee rial Emovinguapparatuss More particularly; itire lates to a: 1 means of i more .erzpeditiouslyvcarrying 0m; VZLI iOQJS OPGIalliOMS whereinimaterial" issele vated and moved to ar'predetermined position or" carried: to a distant placesoi 'disposal; It is of particular utility for eartlinvorking operations or for li'andli nglbulk materiah suoh as sancl; gravel-, coal, snowashes; chemicals;- minerals:and othe1='- si-rriilari materialss: Tha apparatus is in the: natures of ai universal earth working machine adapted intaz single: unit i to perform functions usually -ear1ieci out by specialized typesof appa-- ratus, such asgraders;b'ull' dozers; slopers,- motor= patrols di zchers and thedikeo This is 'a con-tinuanemia-part of our='Patent'"2;348;!796;i May "16 1944i.

The inventioniricludes apparatus *with an extension boomofexceptional radius of "action; andiwith precision controliand with positive lock in gw features i: is adapted foroperating in places where: other i apparatus could not iun'ctiom It also includes materiaigathering and lifting-op eration'siof 1widewarietv' andiat 'a" relatively h igh rates or" speed- 1 and E with simpl "effective control ands marri-pui'ationzl. Ther" invention includes at member :wherebytherseoop will act somewhat aft a It thus can-'- shape the tadjacent earth surface: and scrape-ex= erltheimannerof axbucket or shovel'.

case material to a loading'point arrdthen rapidly perform: the loading" operation; Besides the scoop a double cylinder mechanism is providedto operateftheisamegcsuch mechanism elongating-the boom to; a; degree: suited: to the work in hand and i at .zthe-same time .permitting anflirreversible ad justment of theiscoop 'orsoraper angle particular- 1y suitedsfor sucli' operation. Irv addition to utilizing a double cylinder mechanism for a-seoop orr'scraxper type implementhvarious other highly:

specialized types of rimplements'imay :be used; eluding; di tching stype units; clam-(shell diggers ,s.

specialized rakes and the like.

Theinvention iIICIHdES'rthQLmQthOfi ofvmaterial moving: iwhereby the-noperationszofi engaging the load and thereafter -.moving; the 102 d -to another;

position is carried. 0n.-by; avcombined; Limit having 2: Theinventionalsouincludes the method crimeterial moving thIOLDgh tHGLUSG "Of hwdraul-icailr eontrolled elements operating'pairs and adaptedo to he: moved relatively to each other under" a variousioperativeconditions oi theap-paratuse Therprincipaii obi ect of th'e present invention is to; 'provides'an':improved'itype: of material movingapparatus adapted tit-fulfill a Wide varietyof 'op erationsswith high efiieiency.

Anotheraobiect of the iitvention istoprovide an apparatus zadapted toilmove material to-a -loading point; andnthereafteratoz load such material on -ve'-i eiomtransportationi :to other locations-f Another obiectloftheuinvention is-to provide' an apparatus suitable-aim earth-workiriget "various operatirevanglesiin athendirectiorr or I earth mo-ve merit-and transrerselythe-reofi.

Another: obiectior the invention is to pro-wide anapparatusrhaving amextensible boom anci ama terial h ancili-ngiir'nplement 'at'ithe endthereoi with dual operative means serving to elongate the noomsanck:toioperatessuch implement "at any predetermined i angle: and 1 thereafter':' to" i retract the: boom:totanypredeterminedextent; Another object ofutheiriventiorr is to proviel w material L moving apparatus 1 operated: by h y draiiiic .system: of: control andewhereina'speciat izedteimplementz is;providediformirrg:=-pa1'tior t-l-iefi hydi-aulic'systeman'd subject te harmonious con trol withithe movementio-tthfe apparatus:-

Anoth'er ohject of:ithesinventionz is to provide a: methodior material moving wherein aidual syss temrof' control: isiemployed for engagingtthe mate rial and ithereaitermoving-title a predetermined position:;

Ahother 1 object 1 of theinvention is to provide a method of engaging oertain materialio be moved" by means asso cia'ted with then-liming operation and-" op'erabl'e at any 'range of movement of ;such'' apparatus; conjunction with" such moving? mechanism:

Otherand further objects of invention will appearirrthe course of the followingrdescription...

To the accomplishment of the foregoing and;

related lends, said 'inventiom then, consists: of the,

means hereinaiter fully. described and particular 2 1y pointed out. in the-claims the! annexed drawinga andthe following. description settingeforth inidfi tail certain meansiembodyingi-theiinvention; such;-

* disclosed-rmeanssconstituting however, bllt iS QV! eral of various forms .in theprincipleioi thee invention mayheused: A

Insaidtannexednrawi f i asdi-fferential action topermit such .dual functiom. 55:- Fig ,1 1 is a rearend riew-ei-the ,vehic1eibasasug -e Fig. 6 is a side elevation of the forward boom 7 end portion showing a hoe-type scoop and closure in open position, and with a scraper angle adjustment shown in dotted lines; Y

Fig. 7 is a side elevation of a clam shell bucket type implement in closed position, with the open position shown in dotted lines; and

Fig. 8 is a side elevation partly. in section of a deep ditching type implement. As is clearly shown in Figures 1 to 4 of the drawing, the material moving apparatus comprises a support I, preferably in the form of a vehicle of rigid construction with heavy wheels 2- and axles 3 and a substantial frame or body member 4, on the upper side of which a circular turntable unit 5 provided with roller bearings B is mounted. The upper turntable member is'secured to the under side of an enlarged platform 1, which is provided at a central point with an opening through which a fixed vertical standard 8 secured at its lower end 9 to the vehicle body member 4, is engaged. The standard 8 carries at its upper end a stationary sprocket over which a sprocket chain I2 is engaged. The sprocket chain I2 is preferably of a length adequate to carry the platform I through a rotation around the turntable of at least a complete circle.

The means for rotating the platform in the full hydraulic system illustrated provides a hydraulic cylinder unit at each end of the sprocket chain |2. These cylinder units l3, I4, are preferably anchored on the platform floor along diagonal lines at each of the rearward corners. Each cylinder should be of suflicient length to permit its piston rods 5, I6, respectively, a long range of motion. A double acting valve in the valve unit |5|, presently to be described, supplies oil under pressure selectively to one or the other of these cylinders according to the direction of motion desired. An air line connection I!) between the two cylinders, transfers air from one cylinder to its companion cylinder to correspond with the direction of movement.

. The rotatable platform 1, at its forward portion at one side is provided with an operators cam 2|, and the valve controls are centered at such point, as will later be described in detail.

Centrally of the platform I, an extensible boom 22 is provided, the forward portion of the main body of the boom projecting beyond the front edge of the platform, in the apparatus illustrated, approximately half its length. In order to obtain longer range of action and balanced operation the boom is pivoted on the platform at an intermediate point, in the apparatus illustrated, at a point approximately one-third the distance from its rearward end. The horizontal pivot for the boom is somewhat in advance of the turntable center and is part of a broad rigid structure supporting the boom horizontally in a plane some distance above the floor of the platform 1.

The supporting structure for the boom 22 comprises a pair of heavy plates 23, 24, securely mounted centrally of the platform 1 and spaced apart a distance somewhat greater than thq turntable width. At the forward upper edges of the plates trunnion bearings 25, are mounted, within which the stub axles 26 are engaged, the stubaxles being secured to the opposite sides of an annular roller bearing track 21 within which an annular roller bearing shell 28 is rotatably engaged. The plates 23, 24, are cut away on an angle at their rearward portion 29 to a point adjacent the floor of the platform and immediately inside the walls thus provided, boom raising andlowering cylinders SI, 32, are pivotally mounted on pivot bearings 33 mounted on the platform immediately below the trunnion bearings 25 of the boom; The piston rods 35 of the boom raising and lowering cylinders are pivotally engaged with pivot pins 35' mounted in brackets 36 at the lower rearward ends of a rearwardly extending frame 31 securely mounted on the rearward face of the annular roller bearing track 2's" heretofore described.

The rearward portion of the frame 31 is formed of a built-up cross-member 38 having'a large central bearing 39 for the main rotatable boom body 5| which terminates in-a large circular end plate 42, carrying centrally a stub shaft (not shown) engaged in the bearing 39. The end plate 42 also has securely mounted thereon a bracket 44 providing two pivot pins adjacent its upper margin above the central bearing 39.

The cross-member 38 has upturned end members providing spaced brackets 45 within which are mounted the axially rotating, tilting, cylinders 45, 41. The

pistons

48, 49, of said cylinders are connected to the respective pivot pins of the bracket 44, and oil pressure selectively directed into one of these cylinders produces axial rotation ofthe entire boom structure, as will be explained in detail hereinafter.

The extensible axially rotatable boom structure comprises the rearward section 5|, preferably formed of a skeletonized frame of three tubular members 52, 53, 54, of extended length secured in the rearward end plate 42, preferably arranged in triangular relation to provide two lower parallel track-ways 52, 53, and a central upper trackway 54. r

The rearward boom section 5| is securely engaged within the annular roller bearing shell 28 which, as stated, rotates within the annular roller bearing trackway heretofore described. Adjacent its forward end the boom section 5| is provided with a triangular bracing member 55, and it may also have one or more similar intermediate bracing members, such as, shown at 5B.

At the extreme forward ends of the tubular members 52, 53, 54, brackets-57 carrying grooved rollers 58 are provided for cooperation with the extensible or telescopic inner boom section 6|. The boom section 5| is preferably made very rigid and its central portion may be provided with reinforcing webs or gusset plates of sheet metal 59 welded to the tubular members 52, 53, 54 on their outer surfaces or to the brace bars secured thereto.

The inner boom section 6| is very similar in construction to the outer boom section 5| having three triangularly related

tubular members

62, 63, 64, with bracing members 65 at intervals of their length. At their rearward ends the piston'iod displacement. This allows the 'piston rod of the cylinder I01 to extend at the same rate as the piston rod in the cylinder I06.

While combined extension of the boom and operation of the implement may be carried on under certain conditions, the operation of the apparatus has in View the use of one valve at a time. However, where bulk material is to be moved as the apparatus traverses an area on its own power or with a tractor, for example, in pushing back high snow drifts by stages in successive levels from the top of the snowbank with the boom held stationary at the selected Working height and angle, the blade may be continuously adjusted as to thecontact angle to spill or roll the snow into the proper line of discharge while the work is in progress.

. When the blade or scoop operating plunger I3I is pushed in, oil flows from the valve port I21 to the cylinder ports I34 and I33. But oil will not flow through the cylinder I06 because the piston is locked due to the valve port I28 being blocked. As oil enters the cylinder port I34, oil leaves the cylinder port I and the piston operates the lever or operating arm 85 on the blade or scoop 1..

adjusting it to the required angle. Oil enters the valve at the port I29 since the port I26 is blocked off. When the plunger I3I is pulled out oil flows out of the valve port I29 into the cylinder port I35 retracting the piston. Oil leaves the cylinder port I34 and enters the valve port I21 returning to the manifold tank I24.

The hydraulic system for raising and lowering the boom comprises a simple double acting valve associated with two double acting hoists con- :1,

nected in parallel.

Oil is supplied from one pump of the dual pump unit II I to the valve I31. When the valve plunger I 38 is in its neutral position oil by-passes through the'valve into the manifold tank I24.

.When the valve plunger I38 is pulled out in boom raising position, oil flows out of the valve port I4I and into the cylinder ports I42, I43 raising the boom. Oil leaves the cylinder ports I44 and I45 and returns to the valve port I46. valve plunger I38 is pushed in to lower the boom, oil leaves the valve port I46 and enters the cylinder ports I44 and I45. Return oil passes through the cylinder ports I43 and I42 into the valve port MI and thence into the manifold tank I24.

The axially rotating, the tilting operation and the turntable rotation or sluing operation are each carried out by means of two double acting valves each of which is connected to single acting cylinders which oppose each other. The valve I5I is supplied from one of the pumps I I I of the dual pump assembly. When the valve plunger I52 is pushed in, oil flows from the valve port I53 into the port I54 of the cylinder I3. Since the cylinder I3 is fastened to the rotatable platform I and the sprocket wheel II is stationary the movement of the chain will turn the cylinders and platform pivoted on the turntable 5 in a clockwise direction. This movement will extend the companion plunger or piston rods I6 in cylinder I4 and the oil will flow from the cylinder port I56 into the valve port I55 and thence to the manifold tank I24. The pipe line I8 between the two cylinders-transfers air from one cylinder to the other. When the valve plunger I52 is pulled out, oil flows from the valve port I55 into the cylinder port I56 and causes a counter-clockwise rotation of the rotatable platform I. Oil flows Iromthe cylinder port I54 into the valve port I53 When the f and into tile manifom tank I24. When the valve plunger I51 is pulled cut, oil flows from the valve port I58 into the cylinder port I59 forcing the piston 49 from the cylinder 41 causing the'companion piston 48 to be forced into the cylinder 46 and its oil to flow from the cylinder port I60 into the valve port I6I and thence to the manifold tank I24. 7

' When the valve plunger I51 is pushed in its operation is reversed. Oil flows from the valve port |6I into the cylinder port I60 which will cause oil to flow from the cylinder port I59 into the valve port I58 and thence to the manifold tank I24.

All oil from the manifold tank I24 flows into the reservoir supply tank I I6 which in turn feeds the two dual pumps III, II2, as heretofore described.

It is to be understood that the main oil supply tank II6and the manifold tank I24 may be arranged on the apparatus at any convenient 'position, such as beneath the internal combustion engine shown in Figure 1. The several control valves with the valve plungers are positioned within a valve housing I00, mounted within the cab, and connected beneath the floor by suitable pipe lines with the oil supply tanks and cylinders as clearly shown in the diagrammatic view or schematic outline comprised in Figure5.

The various valves used to effect the operations just described co-operate with each other as follows:

Valve I22 controls by means of the plunger I the flow through the pipe I23 shown in Fig-.- ure 5 to divert the oil into valve II8 controlling the boom extension and blade, angle, position, or to by-pass such oil to the manifold I24.

The valve II8 just referred to controls by means of the plungers I25 and I3I, the extension of the boom with the pistons I08 and I09 (shown in Figure 5) moving in unison and by differential action of said valve as heretofore described in connection with Figure .5 controlling the operative angle, or operation, as the case may be, of the implement mounted on the free end of the boom.

The valve I31, by means of the plunger I38,

. controls the vertical angle of the boom and holds controls the horizontal angle of the platform and locks the same in adjusted position as above described in connection with Figure 5 and the valve plunger I51 controls the axial rotation of the boom as set forth above.

As has been stated, the structure shown in Figure '1 is substantially identical with the hoetype scoop 8| heretofore described and illustrated in Figure 1. Two different types of implements to be actuated through the differential action of the dual hydraulic cylinder units are illustrated in Figures '1 and 8.

In Figure 7 a clam shell bucket-type of implement is illustrated, the open position being shown in dotted lines. The clam shell implement comprises two complementary shells, I1 I, I12, having reinforced marginal edges I13. The member I1I is provided with a pivot I 14, centrally of an extension'arm I15, mounted on the upper edge of said member. The extension arm is provided with a pivot I16 at its upper end, connected by a link,

I11, with the sleeve, 9|, secured to the piston rod' of the control cylinder, I01. The pivot I14 is ameness :supportedmn :aabracket, l'1 9,- connected with the auxiliary section of theboom. The-shell member'I't2'.carries.an extension arm, 18!, having a ipivot 482 .at its extreme upper end,engaged' with ta bracket, "Hi3, :rem'ovably mounted on the :aux- .iliaryframe. cross link,- I84, is connected with anzinterm'ediate portion of the arm, l8 i, by means lofaa pivct pin, -I85,-and at its opposite end-is engaged .on the pivot pin I 16, :heretofore de- .scribed-. -It is believedthe operation of the-device -will be obvious from the description of its construction, and the showing in dotted=lines in Fig- -ure 7, wherein'the retraction of the operating piston :-9 I serves thepurpose of swingingtthe shells widely apart.

The structure shown in Figure :8 :is intended jor use in deep-ditching oper-ations andthe like. It-dssomewhat in the nature of a post-hole diggcrin its st'ructural features, but the jawsof the implement -IEJI, Hi2 are-appropriately in shape f fortthe work in: hand. .Theg'aws are supported on a 'tubular member, I93 of extended length, the 'lowerendof which iscutaway to providea narrow terminaliportion, I9 1, provided-with a pivot pin, 1 95. :Togglelinks 1 96, leiare provided at the-upper ends of "the arms-supportingthe jaws above .the ,pivot, 195, and the toggle links are connectedto a pivot pin I98 on the endof an operating rod, 199, extending through a central aperture 20! rat the upper end of the tubular member I 93. An upstanding mg -2532, is provided on theforwar'd edge oi -the upper portionof the tubular member, l.93,--and abell-crankilever is rp'ivotally mounted onia pivot pm, "253 2, on said lug. 'One end offthe ball-crank lever .is provided with a slotwhich engagesover apivot pin, 2535, inth'e upper endoi 'the operating bar, I99. The iopposite end of thebell-crank lever carries apin, 2W6, engagedin a slot, 251, in an extension-plate, 238, secured bysuitable fasteningdevicesto the end or the operating piston, 9|. Various :means of "fastening the tubular member tolthe auxiliary section 'o'ftheboom may beused, but anadjust- "able device is desirable in order to have-the ditch- "ing operation take place onapproiiimately a vertical line, with the operating apparatus at var-- ious angles to the work at hand. A p1ate, 2il9, "is provided secured to the forward end of the anxiliarysecti'on of the boomyhavinga curved fion't edge, provided with notches permitting various aiigle's of adjustment. The tubular member is pivotally secured centrallyof theplate by means of-a heavyipin, 2! l, and a latch memb:r, 2-i2, enga ing in'the'no-tches serves to'hold theltubular member at various-angles of adjustment. I Other modes of applyinglthe principle .of our invention may be employed instead o'f'those exi plained, changebeing made as regards'the means herein disclosed, provided .the means stated by any-of theffollo'wi'ng claims-or the equivalent of such stated means be employed.

We therefore particularly point out ."and distinctly claim as our invention:

l, (An apparatus of the character described having incombinationoa verticalesupport, aplatform rotatable on said support, .standards ion as dplatform, .atlescop'ic boom pivotally-sup tunes on said standards, hydraulically: operated nieansror moving-saidboom on its pivot h-ydrauhe means 'for eperaung .the telescopic elements of said boom, a scoop member on said .boom end and a closure member for said s'ooopmovably m ared inwardly thereof on ithesguideportion r sa ;.bojom, and'ineansautomaticallybringing esu're menses it closing action "through the 'inward movement of said scoop towardvsaid closure member.

2.'An apparatus of the character described having :in combination a'support, a rotatable 5 platform on saidsupport, a pair of standards'on said platform, aver-tically adjustable framepiw otally: mounted on said -standards, an axiallyz'ro tatable main 'boom rsection supported on said :frame, means acting -between saidframeand said bermovabletlongitudinally 'of the maintmember lto extend nandlretract the free end of :the boom and operable totperform a working-stroke*by-retractingthe ireeend of-the boom, a scooping-4mtplement attached to the working member at the free-end andoperated by the working member performing .a working-stroke, a closure member for the :scooping implement attached. to 1 the: main member:at its freeaend andtbeing positionable to automatically close the implement when -.the working member of the-boomis retracted," and a ,power-systemoperable to sine the-boom and to actuate the working member. Apparatus comprising, a vehicular basepa. boom on the base mounted for :sluing and comprising afree end, the boom comprising a main membenattached to-the base and extending outwar'clly therefrom, a working member movable .longitudinallyof I the main member to extend-arid rtraetthe'free endoo'f the boom a scoopingimplement attached to the workingmember at the free end, a closure member for the sCoopingim tplement movably-attached'to the main member "at 'its out ard end and being positionable to automatically close the implement when the working member JOfLth'e boom is retracted means operable bythe retracting movement of the working '"mer'nber'to actuate the c'losure member into vJpositionlto closethe implement, and a powersy'stem'operablefto slue the boom and to actuate the "working member.

.5. Apparatus comprising, a vehicularbase, a 'lfoom Lon'thebaSe mounted lior sluing and vcom- "prising afi'ee :endfthe boom comprising a.m'aih member attached "to :the base and extending outng wardl'y therefrom, "a working member movable longitud'inallyo'f*the main member to extendand retractfthefreeend. of'the boom, a scooping implement "attached to the working member "at the .fr'ee end, a closure memberfor "the scooping c5 implementmova'bly attached to the mainmem'- her at its ifree "end and being positionable to "automatically elosjefthe implement when "the "workingfmember "of the "boom is retracted, "means "operable 'by fthe retracting movement "of ftl'ie "working 'm'embei ito actuate the closure member to push m'a terial 'into the scooping implement "and to "closetheimplement, "and 'a power system operable ":to 'fs'lu'e the boom and "to actuate the waning s'member.

a "La 11 mounted on said base for sluing', mechanism for 'sluing said boom, said boom having a base section and an extensible section telescopically mounted on said base section, mechanism to extend and retract said extensible section, an implement attached to the free end of said exten sible section and having a working edge, said base section having a transverse pivotal mounting, mechanism for tilting said base section about said pivotal mounting, one of said boom sections having a fixed orientation relative to said implement working edge, said one boom section being mounted for oscillation about an axis extending longitudinally of said boom, and mechanism for oscillating said one boom section.

7. Apparatus comprising a base, a boom lmounted on said base for sluing, mechanism for :sluing said boom, said boom having a base section and an extensible section telescopically *mounted on said base section, mechanism to extend and retract said extensible section, an im- :-"plement attached to the free end of said extensible section and havin a working edge, said implement having a fixed orientation relative to the longitudinal axis of said extension section, said base section having a transverse pivotal mounting, mechanism for tilting said base section about said pivotal mounting, means mounting said base section for oscillation about an axis extending longitudinally on'said boom, said extensible section being mounted non-oscillatably about said axis relative to said base section, and

mechanism for oscillating said base section about -said axis.

8.' Apparatus comprising a base, a boom mounted on said base for sluing,'mechanism for sluing said boom, said boom having a base section and an extensible section telescopically mounted on said base section, mechanism to extend and retract said extensible section, an implement attached to the free end of said extensijble section and having a working edge, said implement having a mounting on said extensible section including a linear pivot extending crosswise of said boom, means for holding said implement in various positions about said pivot, said base section having a transverse pivotal mounting, mechanism for tilting said base section about said pivotal mounting, means mounting said base section for oscillation about an axis u dinally of said base section, said base section 2; having an annular bearing in said track so arranged that said base section of said boom is held against longitudinal movement relative to said annular track, power means operatively connected between said base and said base section of said boom for tilting said boom about said horizontal pivotal mounting, power means operatively connected between said base section and said annular track for oscillating said boom in said bearing about an axis longitudinal of said boom, mechanism operatively connected between said basesection and said extensible sectionfor extending and retracting said extensible, section of said boom, and animplement at:-

tached to the free endof said extensible section in fixed orientation about the longitudinal axis of said extensible section.

10. Apparatus comprising a vehicular base, a rotatable platform on said base, an annular track having a horizontal pivotal mounting on said platform, a telescoping boom having a base section and an extensible section slidable longitudinally of said base section, said base section having an annular bearing in said track so arranged that said base section of said boom is held against longitudinal movement relative to said annular track, said base section on the side of said bearing opposite said extensible section lying wholly within the dimensions of said-base, power means operatively connected between said base and said base section of said boom for tilting said boom about said horizontal pivotal mounting, power means operatively connected between said base section and said annular track for oscillating said boom in said bearing about an axis longitudinal of said boom, mechanism oper-atively connected between said base section and said extensible section for extending and retracting said extensible section of said boom, and an implement attached to the free end of said extensible section in fixed orientation about the longitudinal axis of said extensible section. V

11. In material handling apparatus of the character described, a telescopic boom comprising a base section and an extensible section movable longitudinally relative to said base section, a scooping implement attached to said extensible section and having an open side toward said base section, a closure member for said implement open side positioned on said base section to register with and close said open side when said extensible section and implement are retracted toward said base section, and means for extending and retracting said extensible member.

12. The combination of claim 11 including a pivotal mounting for said closure member permitting oscillation of said closure member toward and away from said open side, and mechanism for so oscillatingsaid closure member.

13. The combination of claim 11 including a pivotal mounting for said closure member permitting oscillation of'said closure member toward and away from said open side, and means operable by retracting movement of said extensible section for oscillating said closure member toward said implement open side.

14. In material handling apparatus of the character described, a telescopic boom comprising a base section and an extensible sect on movable longitudinally relative to said base section, a scooping implement attached to said extensible section in fixed orientation relative thereto, said base section comprisin a plurality of spaced parallel beam members, a fixed annular track, a bearing secured to the base section of said boom and engaging in said track for mounting said base section of said boom for oscillation about its own longitudinal axis, mechanism operatively connected between said track and said base section for so oscillating said boom, and mechanism operatively connected between said base section and said extensible section for extending and retracting said extensible section.

15. In material handling apparatus of the character described, a telescopic boom comprising a base section and an extensible section movable longitudinally relative to said base section, a scooping implement attached tosaid extensi- "ble section in fixed orientation relative thereto.

said base section comprising a plurality of spaced parallel beam members, a bearing mounting said base section for oscillation about its own longitudinal axis, a horizontal pivotal mounting for said bearing mechanism for oscillating said base section in said bearing, mechanism for tilting said bearing and base section about said horizontal pivotal mounting, and mechanism for extending and retracting said extensible section.

16. An apparatus of the character described having in combination a support, a platform pivotally mounted on said support, hydraulic means for rotating'said platform acting between said platform and said support and operative through an angle of not less than 180 degrees of circular movement around its pivot, a telescoping boom comprising a base section and an extensible section, means mounting said base section on said platform for boom oscillation about an axis longitudinal of the boom, a horizontal pivot for said base section mounted on said platform, hydraulic means for tilting said base section about said horizontal pivot, hydraulic means for rotating said boom base section axially, hydraulic means for extending said extensible boom section, a material moving implement pivotally mounted on said extensible section, and means for moving said implement about its pivotal mounting.

RAY FERWERDA. KOOP FERWERDA.

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

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