US2973942A - Multiple hoist apparatus - Google Patents

Description

March 7, 1961 D. w. scHAPER MULTIPLE= HoIST PPARATUS Fi1ed Aug. 18, 1958 INVENToR.

DONALD W. scHA ER 2,973,94z MULTIPLE HoIST AffARATUS Ei1ed Aog. 18, 1958, Se. No. 7ss,485 13 c1ahns. (cL 254188) ThiS invention relates to hoists and oaIicularly to hoistS adapted to pfovide a Inultiple nun1ber of hoiSt capocities.

A11 obiect of nly invention iS to provide in a single apparatUS an affangen1ent fof convefting a hoiSt to a. Selected Inechanica1advantage Tafio of a plurality of available arfangen1entS for diffefent n1echanica1advantage fatios.

Another obiect is to ofovide an apparatos Whioh may be conveTted by SiTIlple adjustInents ffoIn a hoist copable of lifting felafively heavy loads at Slow speed to a hoiSt capable of lifting felatively Hghtef loads at relatively faStef Speeds.

Another obiecf is the pfovision foT coInb ining in ono hoiSting appafatuS an arTangenlent fof a hoist of one lifting oapacity and a hoist of anothef liffing copacify vvifhollt dupHoation of hoists.

Anothef object is the pTovision of a hofSting Inecha 11iSIn Which in effect pfovideS automatic rereeving by Se lectively including soIne Sheavos in the pnHey a11ango ment and oIf1itting othe1- sheaveS in the puney afTange Inent.

Znother obiect is to pfovide `a cable hoiSf having dnaI of n1111tiple functionS, that iS, providing difforont I1o chanica1advantage ratios as Tequired.

Another objoct is the pfoviSion for sifnple and readily opefable controIS fof changing a hoiSting trlechaflisn1 fron1 one Teeving arfangenent to another feeving ar Tangenlent Withollt reInoval of the cable fron1the SheaveS.

Another object iS the provision for a readily adjustable nechanisn1 for the changing of a cable hoist ffoni one lifting capacity to anotheT lifting capacity.

Another obiect is the pfovision foT quick ohangeovo fron1 a cable hoist having one speed and WeightIifting capacity to anothef cable hoist having anothof speed and weight-Hfting capacity.

Another object iS the provisioo for obtainfng iIn roved foSulfs in a new and inlpfoved Inanner.

ther obiects and a fuHer underStanding ofthe in vention Inay be had by feferring to the fonowing de Scription and c1ain1s, taken in conjunction With t11e ac companying drawing, in Which= Figure 1 ShovvS a side elevational view paTtiany in Sec tion of a hoisting IneChaniSm en1bodying IIly invention and Showing the paTtS in one affangenlent;

Figure 2 is a Side elevational vieW of a hoist eInbody ing Iny inveotion and Showing the paffS in anofhef posithe line 44 of Figure 1 and Showing detans of fho coo l 2 FiguTe 6 is an onlargod efspective view of o po nSed fof holding tho coooHng of catch If1enobof i1 diero11f alternative positions. Z 111 the dfaWing, .parts ale ShoWn paTtiany diog1 oIfi- Inaticany and SoInevvhat oot of the uSual arTa neoo fo ordef to better iHUStTate the p1inciple of fho fIfvenffofi and to show the felationshi of tho pafts.

hoiSing dmm 11 car iod by a oney of crahofo driven by an electTic motor in a n1anoor fo wind ood onwind a cab1e 12 aboutfhe hoiStiog dfoIf1 11. T1io cable 12 is in tWo sectionS vith endS offho coble 12 being siITllltaneoIISly vvound around ajially oHgoed Sec tionS of the Wind-up dTuIn 11.

The opposite endS of the two Sections of fhe hoiSHh cab1o 12 are anchofed to tvo equaHzer rfnS 13 havifg their one ends pivotaIly oarfied on the tToHey ofofano by o pivot suppoft 14 and having their opposite coIfo sponding endS loosely fitfed in a croSSbaT 15fnooch InanneT that When one equaHzeT bar 13 iS faiSed,tho othef equaHZer bar iS lovvefed by the filting of the c1oss bar15 opon a pivot soppoTt 16 equidistant of its eodS, the pivot Suppoff 16 also being SUppoftod by the ffone of crane. AS iS known, fho equaHzer baf anangenlefft fends to n1aiotain the tvvo seotioI1S of the cable 121n equal tension should thero be stretching or contractioo of one cable section felative to the othor.

The cable 12 nlade op of tWio Sec tions is reeved about a puney block 21 Which is suppoftod by the tronoy of orano and around a Inovable UHey block assen1bly fnado up of upper puney blocks 23 and the lower puney block 26. AS Seen in the draWing, the tvvo t1vin sections of fhe cable 12 ale feeved around the SheaveS of tho fronoyf SU ported puHey block 21 and the assen1blyofpuney blockS 23 and poney block 2G in Slloh InanneT thf nlechanica1 advantage iS obtained by fho .vvinding .11i of the cable 12 on the hoisting drun1 11 With the oo poSito ondS of the cable Sectioo endS of the two equaHzer bafs 13. l

The troHey-suppofted puHey block 21 iS caflfed on a Shaft 22 in Such Ihanner that the puney blook 21 haS a nxod aXis Telativo to the tfo lley of craoe U onvvhio11 it iS carried. Inthe en1bodiInent of the inV nfio11jnoS tfated, there afe foor Sheaves 21o, 21 Z,, 21-o a11d 21d included in the puney b1ock 21, the sheaves 21o and 21o being oiSposed adjacent one end of fho Shaft 22 and the sheaveS 21 o and 21 zf being diSpoSed ao jacent the other end of the shaft 22 Also o ed by f11o troHey or ofaoe and i11 nxed oosition foativo to fho poHey block 21 iS. anoppef Stop. pad 17, haying o flf)1'i movable poHey blocks opon being 1 ai od o f(1ly io c1oSe pfoxiInity to the pIIlley block 21 t horo is a dovvf Wardly exfending pfoiection 18 ffom fhe Stoo pd 17 vhich is so positioned aSfo be able to fit o extondbo tvveon fhe oppeT poftions of tho fvVo 1)1lley b1 )ckS 231 opon theSe pnHe blockS 23 beiog IIloveCL Uo agafnst too stop pad 17. EXtending in `a hofizontal p1ano and pafa1 le1 t() each other are tWo lock pins 19 hich look pio n1ay bo n1oved a1ong their fespective axes by Solonofdg on 3. shaft 24. SheoveS 23,o and 23o afe dispoSedod iacont ono end of tho Soft 24 and ShoaveS 23o ond 23 aTe disposeddiacenf the othe1 end of theshaft 21.

S being suppofted by o block having a plnfalify of puneys dfsposed on axeS 6xed Telative to each othe1, Second puney blook having a pluTaHty of puneyS, Some of the latte1 pUHeyS being diS posed on aXeS adapted to be diSplaced felative to the axes of otheT of the latte1 UneyS, Said some of the latteI puneys being divided info tWo gfoupS of puneys axiaHy Spaced apart to accon1modate thefebetween Said other of e lanef pUHeys, the total numbef of said some of the latfe1 puneyS being equa1 fo the fota1 nun1bef of the pUHeyS in Said fifst puHey block, cable IfleanS Teeved about the puneys of Said firSt and Second puney blocks foI providing n1echanical advantage in moving one puney block Telative to the other, one of Said puney blockS be ing suppofted and the other of Said puHey blocks being nfovabe felative to fhe other, fiTSt selectively opefable interlooking nleans for Inainfaining the axeS of the Said 1atter puHeys of said Second puney block in fixed TelationShip to each other, Said lafter puneys of the said second puney block being Separable to perInit the axes of soIne of the lafte1 puneyS fo be n1ovable relative to the aXes of other of the attef puHeys upon the Unlocking of said fifSt Selectively operable interlocking noanS, Second Selectively opeTable inteflocldng IneanS for n1ainfaining the axesof Said Some of the latfeT UHeyS in fXed TelafionShip to the axeS of the pulleys of said fi1Sf puney block, said second interlocking n1eans inc111ding auto Inatic locking IneanS opefable Upon noving Said some of the latte1 pnHeyS proXimate to said st puHey block and including solenoid nleanS for feleaSing Said autoInatic locking Ineans, the aTTange1enf of puHey blocks and TSt and Second infeflocking IneanS pfoviding for one n1echanical advantage by Said cable ITleanS and puney blockS upon the aXeS of Said son1e of the latfer puHeyS being T1afntained in fixed TelationShip to the ofhe1 of the lattef puHoys of the second pulley block and for another nlechanical advanfage upon the aXes of said son1e of the lattel puneyS being movable relative to the axeS of the other of said latter puHeys and maintained in fixed Te 1ationship to the axeS of the puneys of Said fi1St puney block.

Z, In a hoiSt, an uppor puney block, a plI1Tality of lovvef puney blocks, a cable 1eeved about said pUney blockS to provide fnechanical advantage, 1oad-engageable n1eanS carTied by one of Said lower puney blockS, con

necting IneanS for Teadily connecfing and diSconnecfing said loWer puney blockS, Said lowel pUHey blockS upon being connectod being n1ovable togetheI relative fo said nppef puney block to provide a fiTSt Dechanical advantage ratio, Said one lover puHey block being Inovable relative to the other of Said lower uHey blocks upon disconnecfion of said 1over puney blockS, locling IIleans for locking said other of the loWer puney blocks in fixed felationshfp to the upper I)I111ey block neanS fof auto Inaticany teTIninating hoisting movement of the hoiSt upon upWaTd movement of Said one lower pUHey block beyond a point spaced from said uppef Uney block, and biaSing IIleanS fo1 yieldably feSfraining upward appfoach of Safd one lovvef pI11ey block beyond Said point vvhile said othef lovvef puney block IT1oves UpWaTdly beyond Said oint to the poSition of Said fixed relationship, Said one lovvef puHey block, upon discon11ection of said lower puHey blockS and the locking of said other of the lower puHey bloc1(S in xed TelationShip to the upper pHney block, pToviding a Second IIlechanical advanfage ratio.

3. In o puney sySteln, the coII1bination of an Upper pnney block cafrying a pluTality of poneyS, Said upper pnney block having puHey axes in HXed TelationShip to each ofhef, a pluTality of lovver puHey blockS caffying a plIIrality of puHeyS, Said loweT puney blocks having a p1nraHty of paranel puney axeS a load-engaging n1em bor oarficd by one of Said lowef puney blockS, a oable feeved on Said pulleyS fo pTovide n1echanical advantage in ITloving the 1oadengaging n1en1ber Telative fo the upper puney block, fSt locking IneanS fof selectively infer engaging said 1oWer puney blockS to posifion tfle poney aXes ff:lofeof in fi.xed felafionShip fo oach otheT and fof Seleotively diSengaging said lower pulley blockS fo pof 1it diSplaceInent of the axeS of the 1ovef puney blockS fI'oIT1- each other, Second 1ocking Ineans for selectively intefengaging the upper puHey block Wih a loWe1 puHey blook other than said ono lower puney block caTrying tho loadongaging meInbor, IneanS fo1 automaticany discontinuing the TaiSing moveTnent of the SySten1 upon ap proach of Said one lovver puHey block to within a liII1ited distance of tho upper puney block, and biaSing IneanS biaSing the safd one lower poHey block against upward approach to Said Uppor puney block to vvithin Said 1nited distance duTing theappfoach of said other pUHey block to a oSition vifhin Said inited diStance foT inferengagement With Said uppef puHey block, the operatfon of the Said puHey SySfem With the lowef puHey blockS inter engaged foviding one ratio of Inechanical advantage and the opefation ofSaid puHey syStem With the IoweT pUHey -blocks diSengaged and the upper puney block intefen aged With the said 1oWer puney block other than said one 1over puHey block carrying the load-engaging 1T1eIn ber providing another Tatio of IIlechanical advanfage.

4. fn a puney system, fSt, Second and third puHey blocks, cable IneanS Teeved about Said puHey blockS for Inechanical advantage, fiTSt interlocking Ineans fo1 Selecfively interlocking the second and thifd puney blocks to Inove togethe1 felative fo the fifst punoy block Upon op eration of the pnney Systen1, Second inteflocking fneans for Selectivefy interlocking the fiTst and SeCond puHey blockS fo pfovide foI Inovenent of the thifd puney block Telafivo fo the fiTst and second puney blocks upon opora tion of the puney SySteIn, IneanS for autoInaticaHy stopping fhe hoSfing InoveInent of the cable nleanS of SaidsySten1 upon approach of the thiI'd puHey block fowaTd the nrSt puney block beyond a point Spaced from the HrSt puHey block, and biasing fneanS yieIdably dolaying II1ove' nlent of the third pUney block tovvard the first puney ock beyond Said point duTing the movement of the sec ond puney block toward the first puney block beyond safd point, opefafion of the pulley SySten1 With tho Sec ond and third puney blockS interlocked and movable felative to the firsf puney block providing one Tatio of fnechanical advantage and opefation of the puHey SyS- tem vith the firsf and Second puHey blockS inferlocked nd the fhird puHey block n1ovable Telative to the inter locked HTSt and second puney blockS pToviding another ratio of Iflechanical advanfage.

In a cable hoist operable by an elecfTic Inotor hav ing a hofsting electfical circuit and a lovveTing olecfrical circuit, an upper puney block havfng puneyS on axeS fixed Telafive to each othe1, a lowel puney block having puHeys on first axes and puneyS on Second axes, cable Tneans Teeved about said puHeyS to nove the 1ovver puHey bIock Telafive to the upper puney bock, said lower puHey block having separable partS each cafrying puneyS and pefnifting displacenlent of the Hrsf axeS and Second aXes relative fo each otheT, feadily engageable first coupHog n1eas havin coInplenlentaTy porffonS carried by the ro- Spective paTfS foT coupling Said parfs togethef fo pfovide for movement of Said arts fogethe1 and Inaintenance of the felative posifions of Said fi1 St and Second axeS of tho IOWer puney block, a 1oadengaging member caTTied by one of Said partS foT engaging a load to be hoisfed, a Sfop member mounted in fixed position felativo to the opper pnney block, Teadily engageable second coupHng Ineans having compleInentary poftions carried by Said stop member and by the other of said pans for coupHng said Stop membef and othel of Said paTts together, lin1it Svvitch IneanS electTicany connected vith Said hoisfing electfical cifcJit and positioned to be actllated by said one of Said paTtS upon appToach to the upper puney block to contro1 Said hoisting electTical circuit and to eby limit upWard movement of Said one of Said parfS foard Said stop neniber, and neans foI biasing Said ono of said pafts againSt n1ovenlent toWaTd said stop n1embof

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