US2603894A - Excavator and loader - Google Patents

Description

J. R. KENNEDY EXCAVATOR AND LOADER July 22, 1952 3 Sheets-Sheet l Filed April .17, 1947 J. R. KENNEDY J. R. KENNEDY EXCAVATOR AND LOADER July 22, 1952 3 Sheets-Sheet 2 Filed April 17, 1947 w M M K JMW w mm 0N July 22, 1952 I I J. R. KENNEDY EXCAVATOR AND LOADER 3 Sheets-Sheet 5 Filed A ril 17, 1947 J R. K/S/VA/EDY Patented July 22, 1952 UNITED STATES PATENT OFFICE 2,603,894.' EXCAVATOR AND LOADERI J amesR. Kennedy, Purcell,kla. Application April 17, 1947, Serial No. 741,971

This invention relates to machinesfor material handlingand morepar-ticularly to'a tiltable scoop excavator and'loader. The machine may be employedifor example, associated with a. tractor, as a; combination excavator and loader for earth working;

An. important objectof the invention isto provide a machine of this kind including means for automatically: setting the scoop in the proper position at all times during operation so as to utilize to. the full the -pressure fluid power employed; \vhich power may be derived fromv that containeddn the tractor, for example, upon which themachine is mounted. Another important object isto simplify the constructionofi a tiltable scoop excavator andloader, associatedw-ith: a suitable vehicle, employing but onercontrollever, for controllingthe fluid pres.- sureto two hydraulic cylinders, forming portions of the tilting means.

Still-another important object is to provide a novel means for initially tilting. a loaded, scoop or-shovel, raising the same to a selectedheight, holding it at this height untilthe vehicle to which the scoop is operatively connected is moved, the scoopthen elevated to a higher position or lowered to=ra lower. position, or permitted to remain in its initially-raised position, then tilted into a dumping position and, when the vehicle is again, in position for loading of the scoop, the latter may be-lowered-to itsloading position.

Yet another. object is to provide a novel means for, manipulation of atiltable scoop, whereby the latter may be'oscillated in order to penetrate andbreak up hardsurfaces andsub-surface material inwhichfit may work.

Other objects and advantages of the invention will-be apparent during the course of. the following.detaileddescriptionof the invention, taken in connection. with. the accompanying drawings, forming apart of this specification, and. in which drawings:

, Figure 1 isa'side elevationof a vehicle upon which the novel. machine is mounted, with the scoopor shovel thereof in a-lowered position.

' Figure Zis a side elevation of the forward portion ofjthe vehicle, with the scoop or shovel of the'new'machine in'a raised position. Figure 3is a side view of the forward portion of 'the vehicle; vshowing the side of the -new'machine opposite the sideshown in'Figures 1 and 2 and the'scoop'or shovel lowered.

Figure'is a'fragmentaryside view of a cylinder and piston and 'as'sociatedparts forming a portion shovel;

Claims. (Cl. 37 -1175) 2, v Figure 5 is an end elevation. of. pulleys, and" a' drum, with a ratchet, wheel forming a partiofjthe means to effect operation of the scoop or; shovel. Figure 6 isv a sectional. view ofaratchet wheiel forming partv oftheassembly of Figure 5,; and taken on the 1ine55 of Fig. 6. t

Figure 7 is an end elevation of a rocker arm associated with a. movable support for thescoop or shovel. V f J v Figure 8 i's'a fragmentary plan view of the mov -1 able supportfor the scoop. or shovelsubstanti'al? 1yv onthe line 8--8 of Figure 2'. H Y

Figure 9 is a vertical section of .a slidableand rotatable assembly forming part of the meansto" efiect operation of the scoop or shovel, substantially on the,line.9,9 o f"Fi ure 3; f Figure 10"is anelevation ,of' a- 'pulleysuppo'rt bracket forming a part of the means to effect operation of the scoop orshovel p f In the drawings wherein; for the purpose of illustrationisshown, a preferred embodiment of the invention and wherein similar reference characters designate corresponding'parts throughout the several views, the letter 'A-designates the novel tiltable-scoop excavator and loader; and the lett'er B avehicle upon whichit is mounted.- and. which carries apower taRe-OffCL' j The novel tiltable-scoop-excavator and l'oader A includes a pair of side frame-members, suitably spaced apart insubstantial parallelism,'each having'a frontend l6 which-carries apulleysupport bracket l1 having a horizontal supportfa'ce. Referring to Figures 1 and 2, which show one side frame member t5, and Figure 3,which illustratesthe other member [5, each member 15 rock.- ably. supports a rocker arm I 8, best shown in Figure 7, which preferably consists of two parallel spaced-apart arm portions, one being an outer portion I9 and the other an innerportion 2!]; To one of these portions (20, inthe example shown) is fixedly'secured a drum or'pulley' 22 having one flange 23 but the adjoining-arm porrtion Zllfunctions as the secondflange; The two rocker arms |8 with their associated drums22 are fixedly connected by a shaft 24 journaled in the two side members I 5';

Theupper end of; each. rocker arm |8,:is ;pi v ota'lly. connectedwith therean-of: an upper scoop,- control arm assembly-"25, which. comprises; a rear control arm portion 26 (to the J-shaped rear end. of which theupper end of the. rocken arm l8 isv pivotally connected), a front control arm portion 2?I and an intermediate portion 28 which is'preferably a tube with the'front, end section of the rear control arm portiomslidable therein. and. the rear. end section: of:v the;front fex'plained.

control arm portion extending into the front end of the intermediate portion 28 and fixedly secured thereto, as by welding.

Means is provided, as shown in Figure 8, to prevent the front end section of the rear control arm portion 26 of the arm assembly 25, shown in Figs. 1 and 2, from sliding wholly from the tubular intermediate portion 28 and may comprise a suitable headed stud or projection 35, with the body of the stud or projection extending through a longitudinally-extending slot 3| in the rear section of the intermediate portion 28.

The lower end of each rocker arm I8 is pivotally connected with the rear end of a lower control arm assembly 32, each assembly preferably comprising a single substantially straight.

arm portion 33 provided with an upstanding,

longitudinally -extending flange portion 34,,

mounting an eyed member 35 for attachment of a flexible member tobe described.

' A suitable scoop or shovel 3B is supported wholly by the two control arm assemblies 25 and 32, with the upper rear portion of the scoop or shovel 36 pivotally connected with the two upper control arm assemblies and the lower rear portion of, the same pivotally connected with. the two'lower control arm assemblies 32. ,Thisscoop or'shovel may include side wall portions 31 sup- 4 arm assemblies 25 (in the example shown, the assembly 25 of Figure 3) is the structure shown in detail in Figure 4. This structure includes a pair of upwardly extending bracket and spring abutments 53 and 54. The abutment 53 is fixedly secured, as by welding, to the rear end of the intermediate portion 28 and the abutment 54 is fixedly secured to the intermediate section of the rear control arm portion 26, as by welding. so that the two abutments are spaced apart and an expansion coil spring 55 bears against the abutments and encircles that part of the rear control arm portion 26 between the abutment 53 and abutment 54.

Supported by the abutment 54 is a cylinder 56 from the rear end of which slidably extends a piston rod 51 carrying a suitable piston head within the cylinder 56. A tube 58 for pressure fluid opens into the cylinders chamber adjacent porting a combined arcuate rear and bottom wall portion terminating at its forward end 'in a somewhat sharp edge 38 extending forwardly of the vertical planes of the front edges of the sidewall portions 31.

Means 40 .to effect operative the scoop or shovel 36 includes structures shown ln-Figures l and .2 .and detailed inFigures 5 and 6, as'follows: In Figure 5 there is detailed a block 4| carrying two idler pulleys 42 with the block mounted upon a shaft 43 and connected, as by the cylindrical member or drum .44 with a ratchet wheel fixed to the drum44 Since the'drum 44 supports a flexible connection to be described, one outer face of the block--:4l and one face of the ratchet wheel 45 provides flanges for this drum 44. Associated with the ratchet wheel 45 is a pawl 46, movable by operation of a control rod 41 with the free end-of'thelatter within reach of an occupant of the vehicle BwWhen the scoop or shovel 35 is raised, as in Figure "2, the pawl 46 engages a-tooth near the right-hand end of the row of teethof the ratchet wheel 45 but when the scoop orshovel36 is lowered, as in Figure '1, the pawl engages a tooth adjacent the left hand end of the rowof teeth. The shaft 43 is journaled in one of the side frame members I5.

Additional portions of means 40 includes the pulley support bracket 48, shown more specifically in Figure 10, and a-pair of pulleys 49 and portion '52 bridging the uprights 5| and se-.

cured thereto. Extending through the tubular -portion 5l is a shaft upon the ends of which are secured the pulleys 49 and 50. The pulley 49 also functions as a drum as will be subsequently -Be'fo're describing the several flexible connections' included in the means 40, just described, those portions of the structure of the means 40, shownparticularly in Figures 3, 4 and 9 'will beexplained. 1 v

Mounted upon one of the upper scoop-control movements of the end (head end) opposite that from which the piston extends. The rear end of the piston rod 51 is fixed to the bight 55fof a substantially U-shaped yoke 55' with the arms thereof'secured to the abutment 53. One of the functions of the spring 55 is to tend to force the piston head toward the head end of the cylinder 56, but this has another function as will be detailed later.

Referring now to thestructure in Figure 3 above that just described, a bracket extends upwardly from, preferably, the rear end of the side frame member I5 which supports theabutments 53 and 54. The bracket 60 supports the rear ends of two horizontally disposed, substantially parallel guide rods 6| whose front ends-are secured to the pulley support bracket 48. j Carried by the guide rods BI is a fixed structure comprising a major cylinder 62 disposed adjacent the front end portions of the guide rods BI, and a sliding or reciprocating structure comprising a piston rod 53 for the cylinder62 extending'outwardly of the rear end thereof, having an arcuately-faced shoe 64 at its outer end bearing against the peripheralportion of a sheave'housing 65. is disposed about a sheave 56 and pivotally supports the latter. The housing 55 is, in turn, flxedly supported by two sleeves 61 which extend about portions of the guide rods 6!, and are adapted to slide back and forth along these rod'sj. The housing 65 is disposed, inclined from the vertical, as in Figure 9 and may be welded to the sleeves 61. A tube 63 for pressure fluid opens into the head end of the cylinder 62 and extends to a coupling 69 for it, the tube 58 and a main conduit 10 for pressure fluid extending to any suitable source (not shown) of such fluid.

The flexible connections forming parts of the means 40 are as follows: Referring first to Figures 1 and 2, there is a flexible connection 15 such as wire cable, secured at one end to the drum 44 of Figure 5, to wind thereabout and, from thisdrum, the connection 15 extends forwardly to and is secured to one end of a retraction spring 18,, the other end of which spring is secured to one of the brackets ll of the adjacent side frame member [5. A flexible connection 11 extends, from one eyed member 35 of the lower scoop-control arm assembly 32, shown in Figures 1 and 2, up-

wardly to the pulley 49, extends fully around it v pulley 42, then diagonally upwardly to the upper idler pulley 42, over and partly around whichit As shown in Figure 9, this housing'65 lateness travels, thenceadownwardly'andrrearwardly-tothe adjacent: drum. 22-:to which itis secured: Referring to the flexible connections showncmore particularlyin: Figure. 3, there is. a flexible: cone 'Irection" 18;. as wire cable, secured to; the other eyed 'member 35' and extends upwardly: to, and around the pulley 50, thenceextends rearwardly to and'partly. around'the sheave 6.6 andzt-hen ex.- tends: forwardly to the support bracket' 48-to which it is secured. A fourth'fiexibleconnection l9i'asw-ire-cable, extendsfrom therear endofa contractioncoil. spring; 80, which latterissecured at; its. other end to: the scoop or shovel 316 at preferably the rear portion: thereof: intermediate theupper. and lower: endsof the scoop :or-sh'ovel. This flexible connection. 19' extends frOm: the spring; 80;..rearwardly to. the adjacent; pulley- 22 tolwhichitris secured;

- :The: vehicle, B'ais. illustrated as a conventional tractor? upon which. the novel machine-A is mounted? in any approved way; preferably" adjacentfthei forward :end thereof with-.the side :frame member I E'secured to: the tractor-chassis so; that the shaft): connecting the drums ,22 and rocker arms 18 may passtransversely. under the tractor B. andsthe horizontal' tubular portion 52" of the pulley" support bracket 48 extend: transv ersely acrossthe frontend-of the vehicle. i

In operation, thervehicleB is, of course; moved forwardly; with the scoop on shovel 36 in. the positions: shown in Figures 1? and" 3' sotthat the ilatter will contact the material beingv worked upon. and cause it. "to move intothe scoop -or shovel-'36; Upon operation of-the conventional valve control leverinotshowniof .the pressure fluid? system, pressure fluid will. be "permitted to fi'owf'along' conduit coupling 69 anditubestfi'll andifit; Since there isobviouslyless lo'ad o'n that portion' of the pressure system representediby' the cylinder 5'6 and associatedstructure thanio'n'th'at portion represented by the cylinder 62 and its associated" structure, that portionincluding the-cyl- 'inder 56i operates first so that piston rod? 51" is forced outwardly to its limit ofmovement,.whereupon the-pressure forces pistonro'd 63 outwardly and the" rear control arm portion 26srearwardly,

which "causes rocking in one. direction of the rocker arm 1 8 and'forward movement of-thelower control arm assemblyw 32: The movement of piston rod 51 compresses spring 55 and'the'movements of the arm portion 26 and" arm assembly 3 2 draw the upper 'end, portion of J the scoop-3B backwardly; thustilting the latter and'causingfit to: cutinto the material at an angle from 'the horizontal and cases the load on thevehicieB. Thistilting is such that the load carriedby the scoop :Will not be lost. When sufficiently tilted the? scoop i' 1 ressure-held in its tilted position. Obviously; alternately opening and closing" the pressure valve will cause rocking movements" of thezpartlyloaded scoop and thus'aid it in workin'g into diflicultmaterial.

= "The: subsequent movement of the piston rod 63 causesfthe'. shoe 64 to' force the sheavehousin'g 'tii toward thefirear end" consequent drawing-up of control arm' assembly 25 forwardlyi and the lower ,scoop control arm, assembly 32, irear.wardly; thus tilting the scoop; i162 as inFigure: 2.; and dumping theloa-d: At..:this timeiithe SDI'ing 8"h8/S.:'eX-r panded but: when the fiuid; pressure is; released, thisrspring may; contract'gand its; contraction permits; because of the connection therewithlof j the flexible connection 119;; the pulleys 22 :to rotate in a. direction opposite,- to the direction heretofore describediand; since thefiuid pressure is nowreleased; the flexible connections 11 and 18 will slacken; Theiconsequent rotation of the pulleys 22 causes rocking. of, the rocker arms out of the positions: as-shown by one in Figure. 2, so. that the scoop is ri'ghtenedi Release ofthe fiuidpressure permits: the scoop tolower by reason of. its weight andthe: scoop is now in position to} per.- form; another-loading or moving; operation.

The height towh'ich thescoop may rise ispcone trollediby' means of ,thecontrol rod 41, pawl 46 operated xthereby, ratchet wheel 45' associated with the: pawl, and: the operative connection,- of the ratchetwheel with the rest oftheassembly, particularly the'blo'ck-M and itsidler pulleys. When elevated to a 'desired position- (not necessarily its'highestposition), the vehicle Bmaybe 'moved' to; a '-positi0n= where. thescoop load may -betdischarged: Manipulationof theconventional pressure fluid rvalve lever" permits; asis now' obvious; further raising of the scoop to? its maximum: highest position. before dumping, :or-lowering it below itsgcarryingr position; for: dumping; Y When: the fluid pressure-in thec'ylirider SB-is released throughhthe tubecBB; the spring 55, working against the abutment 53, whichis fixedly seemed. as by welding, to; the rear end of the intermediate portion 2-8; forces the shovel 36 into-1 the normalaor loading position shown in Figure 3.. I I

Various changes may. be made to the form of the invention herein shown and' described without departing-from the-spirit off-the invention or "scope ofthe-claims-.. I

What is claimed is: -"1-'. In: a material 'handlerya scoop? meansfor selectively maintaining the scoop in a-scooping position, in a rearwardly-tilted position and in a forwardly-tilted' position, including. an: upper scoop controlarm assembly, including a" rear control arm: portion, afront control i armgportion and an-intermediate tubular portion, with the front end-section ofsaid rear control armportion 'slida'bly retained in said intermediate tubular portion and said front 'control arm portion fixedlysecured'to'said intermediate tubularportion, an expansion coil spring about an intermediate section of: said rear control arm portion rear- Wardly of said frontiendsection thereof, anabutment carried by said rear control arm portion 'rearwardly ofzs'aid"intermediat'esection, an abutrment'icarried'by thez-rear end-of said intermediate tubular portion,i:with said coilyspring bearing against" said abutments, a lower scoop-control a'rni assembly, both assemblies pivotally con,- nested-with said'scoo-p, a rocker arm; and-means pivotally connecting-the assemblies: with said .rocker'arm for reciprocation in} opposite directionszupon: oscillation'zof said rocker arm; means operatively"connected with said rocker armfor rocking said rocker arm in one direction; including a pressure fluid cylinder; and a piston. rod therefor; with said. cylinder supportedby: one of saidr'abutments and the pistonrodoperatively connected with the other abutment;v and means .to'roclt said'rocker arm in-the opposite direction. 2. In a material handlerla scoop; meansdor .7 semetiveiy maintaining the scoop in a scooping position, in a rearwardly-tilted position and in a'forwardly tilted position, including an upper scoop-control armassembly, including a' rear control arm portion, a front control arm portion and an'intermediate tubular portion, with the front end section of said rear control arm portion slidably retained in said intermediate tubular portion and said front control arm portion fixedly secured to said intermediate tubular portion, an expansion coil spring about an intermediate section of said rear control arm portion rearwardly of said front end section thereof, an abutment carried by said 'rearcontrol arm portion rearwardly of said intermediate section, an abutment carried by the rear end of said'intermediate tubular portion, with said coil spring bearing against said abutments, a lower scoop-control arm assembly; both assemblies pivotally connectedwith said scoop, a rocker arm, and means pivotally connecting the assemblies with {said rocker-arm for reciprocation in opposite directions upon oscillation of said rocker arm; means for rocking said rocker arm in'one direction, including a pressure fluid cylinder and a piston rod therefor, with said, cylinder supported by one of said abutments and the piston rod operatively connected with the other abutment; means to rock said rocker arm in the opposite direction; a drum operatively secured to said rocker arm for rotation upon 'oscillationof said rocker arm and a flexible connection mounted upon said drum and operatively-connected to said scoop; and means operatively connected with said assemblies to raise and lower said scoop.

' 3. In a'material handler, ascoop; meansfor selectively maintaining the scoop in a scooping position, in a rearwardly-tilted position and in a forwardly-tilted position, including an upper scoop-control arm' assembly, including a rear control arm portion, a front control arm portion and an intermediate tubular portion, with the front end section of said rear control arm portion slidably retained in said intermediate tubular portion'and said front'controlarm portion fixedly secured to said intermediate tubular portion, an expansion coil spring about an intermediate section of said rear control arm portion rearwardlyof saidfront end section thereof, an abutment carried by said rear control arm portion rearwardly ofsai'd intermediate section, an abutment carried by the rear end of said intermediate tubular portion, with said coil spring bearing against said abutments, a lower scoop-control arm assembly, both assemblies pivotally connected'with said scoop, a rocker arm, and means pivotally connecting the assemblies with said rocker arm for reciprocation in opposite 'directions upon oscillation of said rocker arm; means for rocking said rocker. arm in one direction, including a pressure fluid cylinder and a piston rod'therefor, with said cylinder supported by-one ofsaid abutments and the piston rod operatively connected with the other abutment; means to rock said rocker arm in the opposite direction; a drum operatively secured to said rocker arm for rotation upon oscillation of said rocker arm, a flexible connection mounted upon said drum and a retraction coil spring secured at one end to said scoop and secured at its other end to said flexible connection; and means operatively connected with both of said assemblies to raise and lower said scoop.

4. In a material handler, a scoop; means for selectively maintaining the scoop ina scooping '8 position, in a rearwardly-tilted position and in a forwardly-tilted position, including an upper scoop-control arm assembly, including a rear control arm portion, a front'fcontrol arm-portion and an intermediate tubular portion,'with the front end section of said rear control arm portion slidably retained in said intermediate tubular portion and said front control arm portion fixedly secured to said intermediate tubular portion, an expansion coil spring about an intermediate section of said rear control arm portion rearwardly ofsaid front end section thereof, an abutment carried by said rear control arm portion rearwardly ofsaid intermediate section, an abutment carried by the 'rear end of said intermediate tubular'portion, with said coil spring bearing against said abutments, a lower scoop-control arm assembly, both assemblies pivotally connected with said scoop, a rocker'armgand means pivotally connecting the assemblies with said rocker arm for reciprocation in opposite directions upon oscillation of'said'rockeriarms; meanszfor rocking said rocker' arm in one direction, including a pressure fluid cylinder and'a piston rod therefor with said cylindersupported by one of said abutments and the piston rod operatively connected with the other abutments; means to rock said rocker arm in the oppositedirection; a drum operatively secured to said rocker arm forv rotation upon oscillation of said rocker arm','a flexible connection mounted upon said drum and aretra'ctionxcoil ispring secured at one end to said 5. In a material handler, a scoop, a support,

means for selectively maintaining the scoop in a scooping position, in a rearwardly-tilted position and in a'forwardly-tilted position, including an upper scoop-control arm assembly, including a rear control arm portion, a front control arm portion and an intermediate tubular, portion, with the front section of said rear control arm portion slidably retained in saidintermediate tubular portioniand said frontcontrol arm portion fixedly secured to said intermediate tubular portion, an expansion coil spring about an intermediate section of said rear control arm portion rearwardly of said front end section thereof, an abutment carried by said rear control arm portion rearwardly of said intermediate section, an abutment carried by the rear end of said intermediate tubular portion, with said coil spring bearing against said abutments,: alower scoop-control arm assembly, both assemblies pivotally' connected with said scoop, a rocker arm, and means pivotally connecting the assemblies with said rocker arm for reciprocation in opposite directions upon oscillation of said rocker arm; means for rocking said rocker arm in one direction, including a pressure fluid cylinder and a piston rod therefor, with said cylinder supported by one of said abutments and the piston rod operatively connected with the other abutment, a drum operatively secured to said rocker arm for rotation upon oscillation of said rocker arm, a flexible connection mounted, upon' said drum and .a, re

tractionjcoil spring secured at one end to Said scoop andzse'curediat its other endtosaid flexible connection, means operativelyqconnected with,

both of -;.said;assemblies to raise; and lower said scop,:including '.a shaft; with said drum fixedly mounted thereon, a second drum fixedly mounted on:said shaft,.'a 'iblock, a pair ofidler pulleys rotatably,mountedqthereon, a second shaft with Saidib1OGk,mD1-1ntd upon said secondshaft for. oscillation,.,ia; third drum mounted" upon said secondishaftd a/secondfiexible connection with one endsportion;thereofLwound upon and securediito;

said second drum and its other end secured to said .lowercscoopwontrol'arm assembly, said second ifiexible connection extending over, and betweensaidgidler pulleys, and a third flexibleconandlin.aforWardlyetflted position including an uppengscoopwo'ntrol arm assembly, including a rear control arm .portion, afront control arm portion andan intermediate tubular. portion, with therfront,endjsection of saidrear control arm portion slidably retained in said intermediate tubulanportionand said front control arm portion fixedly secured to said intermediate tubular por,ti on-,; an expansioncco'il spring about an intermediatesection, ofnsaid rear control arm portionrearwardly, of saidlfront end section thereof, an ahutmentcarried .hy .said, rear control arm portionrearwardly. of said intermediate section, an abutmentmcarried by,the rear end of said inter.- mediate, tubular portion, with said coil spring bearingiagainstsai'd, abutments, a lower scoop.'

control. arm jassembly, both assemblies pivotally connected ,with saidscoop. a rocker arm, and

me'ans;.pivotally connecting the assemblies .with

said ;rockerarm .ior, reciprocation in opposite directions;upo.n,'oscil1ation of 'said'rocker' arm; means for; rocking said rocker arm in one direc-- tion, includingaa pressure fluid cylinder and a piston-rodzathereof, with. said cylinder supported by ,OIIBLOf'. saidabutment's and the piston rod operatively, connectedwith the other abutment, a drum,operatiuelysseoured to said rocker arm fonrotation'upon oscillation of said rocker arm, aeflexible connectiongnounted upon said drum andi-aeretraction.,coil spring secured at one end to'isaidscoop and'secured at its other end to said flexible. .connection;.;means operatively connected withifboth, of. said assemblies to raise and lower said,sco op,w,including va shaft, with said ,drum fixedly mounted, thereon, a second drum lfixedly mounted onsaid, shaft, a block, a pair of idler pulleys rotatably, mounted thereon, a second shaft ,with said block; mounted upon said second shaft for oscillation, athirdidrum mounted upon saidasecond shaft, a second fiexible connection Withonejendportion thereof wound upon and secum to-said second drum and its other end securedto said lower scoop-control arm assem: bly'. ,said second flexible connection extending over .,and .,bet W ien said idler'ipulleys, a second oontraotion coil spring with, one end thereof. seeu dgto -s aid ,sl liort, forwardly 'of. said. block, and a, third flexible connection with one .end thereof woundaboutlsaid third, drum and secured theretcian its voth r.e d.lses l esi to thaat ier; end of said seco d c nt ac o ,c0i1. p e;: ans1. mea s :iZQ a tern te y take n a pay, out the i term diatet ort o i ot aid secondrflexibl cone, cence. ,1 1 y 1:

7 n a. mat r a handl a scoopna support, means :for selectivel ma n ainin th sco p--. n.1a-. scoop n rp sit 'onr in 3 6. '-W@IdlY1' i1t6dI P0511303 nd i a.: crw r e lt d positi n nc iidinezan pp r sc op-c nt o armv a e b y nclud n ta,v ea cont l rm portion; a front ,go trolisarm.=

po t n n a ntermediatetu y ar o ti with h pfro tjend s ct n o .said rear ontr l portion ,s idah wreta ned in ai interm diat ubu ar p rt n and v ai ir lit c ntrol .arm.1n ;i ion fixed secur d 51 sai inier ediateatubulap porti n an expa sion coil sp i about anintere m d ate sect on o s id rea ont l miport on rearwardly of said front end s t n: -ther.eof, ian-;

butment \zc rried y said rea c ntrol arm IPQ r. io re -ward y' of {said i te med a e :s,ecti0n,

bearing against said butments, a lower Scoops contr arm assemblil both assemblies @ivotallr nnecte w aid. scoop; a rocker. arm, and

m an pisro ally; onn ct n th ass mb s w th ai v maker, a m; fo cip o ation in opposite rect o v1 12 1 o c l at on .oflasaid tqokerf arm; mean i ack n sa drocker arm .-i

oe r iv l conn cted witht e other atutmems.-v

drum co eraiiveln se ured t said JZQQKQI -;arm-;

sa i d, exible conn t on; means operatively con-.1

nectedw bh. 19th of said ,ass emblies to; raise and.- owe said coop in u i a shaitia seconddrnm Withea s con um fix dly mounted th reon a ;P1 :flXed y mo nted, on said? shaft, ,a;b1'0,ck a a n. c. e znulleys r tatably'.m untedith r o i; secon s a t w th said b oc mou ted upon said. second shaft for oscillation; athirddrum-mou-nted: u o sai se ondshait, .a. seccnd.flexible;conneciia i rithon -e dportionthereof,woundunomand; ecured;ta said "secondrdrum; intermediate length :ofv said vsecond flexible connection, and {its oi er'gend secured; to. said. lower SQQ. p-r I arm; assemb m; aid se nd ii exihleiieqnne tion havi g. its d recti of travel reversed-sat; said seeond drum and extending therefrom .overiiand. betwe n s id idl r pulleys, a fourthjdrummoun d; upon said supportgwith an intermediatie portion, ty-sai sec nd fl xible connection W0u d:.- 2hr upon, and. a thirdjexible connection with :one and. owq n eup csaidethird drum and secured e to an its igther ,end operativelyzconnected with said support. Y p q 8. In' a materialyhandler, a, scoop, a support, means for selectively maintaining the-scoopiinea scooping position, in a rearwardly-c-tilted position and in a forwardlyetilted position including; an upper scooprcontrol arm assembly; including arear controlv arm portion; atfront'controlwarm portion and an intermediate tubular portion; with. the front end section of-gsaid rear control arm portion s1idably retained in said: intermediate tubular portion-andsaid front control-arm por-; tion fixedly secured to; said intermediatev tubular portion, an expansion coil spring about an inter. mediate section of said rear controlarm portion butmen carr ed by: the rear end-of idc-mtem mediat t l lflar' por o wit said coil sprin onedirecrionkin nd a a press re fluid cylinderzanda iston rq sthe efo wi h said cyl nder supported.- y :one o sa d abu mentsand the pis on mdi abutment carried by said rear control arm portion rearwardly of saidintermediate section, an abutment carried by the rear end of said intermediate tubular portion, with said coil spring bearing against said abutments, a lower scoopcontrol arm assembly, both assemblies pivotally connected with said scoop, a rocker arm, and meansipivotally connecting the assemblies with said rocker arm for reciprocation in opposite directions upon oscillation of said rocker arm; means for rocking said rocker arm in one direction, including a pressure fluid cylinder and a piston rod therefor, with said cylinder supported by one of said abutments and the piston rod operatively connected wtih the other abutment, a drum operatively secured to said rocker arm for rotation upon oscillation of said rocker arm, a-flexible connection mounted upon said drum and a retraction coil spring secured at one end to said scoop and secured at its other end to said flexible connection; means operativelyconnected with both of said assemblies to raise and lower said scoop, including a shaft, with said drum fixedly mounted thereon, a second drum fixedly mounted on said shaft, a block, a pair of idler pulleys rotatably mounted thereon, a shaft with said block mounted upon said second named shaft for oscillation, a third drum mounted upon said second-named shaft, a second flexible connection with one end portion thereof wound upon and secured to said second drum, intermediate the length of said second flexible connection, and its other end secured to said lower scoop-control arm assembly, said second flexible "connection having its direction of travel reversed at said second drum and extending therefrom over and between said idler pulleys, a fourth drum mounted upon said support,with an intermediate portion of said second flexible connection wound thereupon, a second contraction coil spring with one end thereof secured to said support forwardly of said block, and a third flexible connection with one end thereof wound about said third drum and secured thereto and its other, end secured to the other end of said second contraction coil spring. 1

s 9. In a material handler, a scoop, a support, means for selectively maintaining the scoop in a scooping position, in a rearwardly-tilted position and in a forwardly-{tilted position including an upper scoop-control arm assembly, including a rear control arm portion, a front control arm portion and an intermediate tubular portion, with the front end section of said rear control arm portion slidably retained in said intermediate tubular portion and said front control arm portion fixedly secured to said intermediate tubular portion, an expansion coil spring about an intermediate section of said rear control arm portion rearwardly of said front end section thereof, an abutment carried by said rear control armportion rearwardly of said intermediate section, an abutment carried 'by the rear end of said intermediate tubular portion, with said coil spring bearing against said abutments, a lower scoopcontr'ol'arm assembly, both assemblies pivotally connected with said scoop, a rocker arm, and means pivotally connecting the assemblies with said rocker arm for reciprocation in'opposite directions upon oscillation of said rocker arm; means for rocking said rocker arm in one direction, including a pressure fluidcylinder and a piston rod therefor, with said cylinder supported byone of said abutments and the piston rod operatively connected with theother abutment,

a drum operatively secured to said rocker arm 1 for rotation upon oscillation of said rocker arm, a flexible connection mounted upon said drum and a retraction coil spring secured at one end to said scoop and secured at its other end to said flexible connection; means operatively conshaft for oscillation, a third drum mounted upon said second-named shaft, a second flexible connection with'one end portion thereof wound upon and secured to said second drum, intermediate the length of said second flexible connection,

and its other end secured to said lower scoop-:

control arm assembly, said second flexible connection having its direction of travel reversed at said second drum and extending therefrom over and between said idler pulleys, a fourth drum mounted upon said support, with an intermediate portion of said second flexible connection wound thereupon, said block and third drum being disposed intermediate said second and fourth drums, a-second contraction coil'spring with one end thereof secured to said support forwardly of said block, and a third flexible connection with one end thereof wound about said third drum and secured thereto and its other end secured to the other end of said second contraction coil spring. I

3 10. In a material handler, a scoop, a support, means for selectively maintaining the scoop in a scooping position, in' a rearwardly-tilted position and in a forwardly-tilted position including anupper scoop-control arm assembly, includinga' rear control arm portion, a front control arm portion and an intermediate tubular portion, with the front end section of said rear controlarm portion slidably retained in said intermediate tubular portion and said front control arm por tion fixedly secured to said intermediate tubular portion, an expansion coil spring about an inter-' mediate section of said rear control arm portion rearwardly of said front end section thereof, an abutment carried by said rear control arm portion rearwardly of said intermediate section, an abutment carried'by the rear end of said intermediate tubular portion, with said coil spring bearing against saidabutments, a lower scoopcontrol arm assembly, both assemblies pivotally connected with said scoop, a rocker arm, and means pivotally connecting the assemblies with said rocker arm for reciprocation in opposite directions upon oscillation of said rocker arm; means for rocking said rocker arm in one direction, including a pressure fluid cylinder and a piston rod. therefor, with said cylinder supported by one of said abutments and the piston rod operatively connected with the other abutment, a drum operatively secured. to said rocker arm for rotation upon oscillation of said rocker arm, a flexible connection mounted upon said drum and a retraction coil spring secured at one end to said scoop and secured at its other end to said flexible connection; means operatively connected with both of said assemblies to raise and lower said scoop, including a shaft, with said drum fixedly mounted thereon, a second drum fixedly mounted on said shaft, a block, a pair ofidler 13 for oscillation, a third drum mounted upon said second-named shaft, a second flexible connection with one end portion thereof wound upon and secured to said second drum, intermediate the length of said second flexible connection, and its other end secured to said lower scoop-control arm assembly, said second flexible connection having its direction of travel reversed at said second drum and extending therefrom over and between said idler pulleys, a fourth drum mounted upon said support, with an intermediate portion of said second flexible connection wound thereupon, said block-and third drum being disposed intermediate said second and fourth drums, and saidsecond flexible connection being secured to said fourth drum, whereby,- as said fourth drum rotates in one direction, additional turns of said second flexible connection will form thereupon and as said fourth drum rotates in the 14- other direction, turns of said second flexible connection will unwind from said fourth drum, a

second contraction coil spring with one end.

thereof secured to said support forwardly of said block, and a third flexible connection with one end thereof wound about said third drum and secured thereto and its other end secured to the other end of said second contraction coil spring.

JAMES R. KENNEDY.

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

UNITED STATES PATENTS Drott et al. Dec. '7, 1948

Images