Патент USA US2405578код для вставки
E.. W. HOLMES 2,405,578 HOISTING APPARATUS FiledMarch 27,1944 s sheets-sheet 1 hIl"uPnHL " j Emmi MMM@ ` Aug. Hä 1946. l E. w. HOLMES ‘ .2,405,573 I' HoIs'TING APPARATUS Filed March 27, 1_944 e sneets-sneptz ~ ' Àug. 13, >1946. E. w. HOLMES ` , 2,405,578 HOI S TING APPARATUS Filed Maron 27., '1944 e sheets-sheet 5 Aug. 13,l 1946, E. W. HOLMES ' 2,405,578 HOISTING APPARATUS Filed March 27, 1944 e sheets-sheet@- i5 76 ¿i ' ¿ai 52 ug. i3, 1946. y E. w. HOLMES 2,405,573 .HOISTING APPARATUS ' l , 95 ¿s 93 î 54%' 29 I _»J e~ sheets-sheet 5 . »94 Í u Filed-March 27, 1944 _ _- ¿3 -__ _ _ ¿y î J I /úé J v 9 0 90 ' . J u _l ¿y ¿j 9 z ’u -~ _ 8 'l __.- u ' 93 ‘ ’ J 62 - ¿M_ . Aug E3, i946. vE. w. HOLMES ` u y 2,405,578 >HOIS‘TING APPARATUS Filed- March 27, 194A ' ` ' 6 Sheets-Sheet 6 l!! 149 ¿a2 já? ,4% 11%.) v f5.5 56a if@ gmac/Mofa A ¿mw Pff/262m@ _ j B342@la . ._ Wg Patented Aug. 131, 1946 2,405,578 UNITED STATES PATENT OFFICE 2,405,578 HOISTING APPARATUS Ernest W. Holmes, Chattanooga, Tenn.; S. Bartow Strang, administrator of said Ernest W. Holmes, deceased, assigner to Ernest Holmes Company, Chattanooga, Tenn., a corporation of Tennessee Application March 27, 1944, Serial No. 528,314 (Cl. 212-59) 20 Claims. 1 The present invention reiates to improvements ’ in hoisting apparatus, and more especially to wreckers of the type employed for handling dis abled- automotive and other vehicles and for other uses where hoisting, pulling, towing or similar operations are to be performed. One of the primary objects of the invention is to provide novel and improved operating and controlling mechanism for the cable winding drums whereby the construction thereof is 10 simplified and improved and the operation thereof is facilitated. . novelty being pointed out more particularly in the claims at the end of this specification. In the accompanying drawings, Figure 1 is a side elevation of the improved hoisting apparatus according to the present in- l vention, the same being shown mounted on a truck and adapted to be employed as a wrecker; Figure 2 is a top plan View ofa portion `of the apparatus shown in Figure 1; Figures 3 and 3a are collectively a rear eleva tion of the apparatus on an enlarged scale, the booms being shown as swung from the opposite Another object is to provide novel and im sides of the truck; , Figure 4 is a/detail View of one of the slings proved driving mechanism for the cable winding drums of apparatus of this character, and partie- 15 for the upper ends of the booms: Figure 5 is adetail view in vertical section of ularly wreckers, of the double boom type in which the driving- gearing for the _boom and service each boom has a drum for the boom cable and cables of one of the booms; , a drum for the hoisting or service cable, whereby Figure 6 is an elevation of the gearing as at any time under control of a single attendant 20 viewed from the right in Figure 5; Figure 7 is a detail horizontal section taken on and from a single power drive. ` the line 1_1 in Figure 6; f Another object of the present invention is to Figure 8 is an elevation of the transferVV or` provide novel and improved hoisting apparatus transmission mechanism through which the driv which, when mounted on a wrecking truck or other vehicle, is readily accessible' as to all of its 25 ing gearings for the booms and the service cables are driven; 4parts for inspection or servicing. ` Figure 9 is a plan View of the transfer mecha _ Another object is to provide a novel and im nism, with the cover thereof removed and parts proved frame in which the mechanism of the shown in section; hoisting apparatus is accommodated compactly Figure 10 is a section taken on the line lll-l0 and jwhich enables narrow hoisting drums of 30 one or more or all of the drums may be operated f in Figure 8; large diameter to be used, with the advantage that fewer layers of cable requireto be wound thereon for a cable of given length than hereto fore, and thereby avoiding or minimizing wedging Figure 11 is an enlarged detailelevation of the lower portion of one side of the frame, showing the drums for the service and boom cables; Figure 12 is a rear elevation of the structure ' of the cable between convolutions of a lower shown in Fig. 11, with the drum operating means; Figure 13 is a detail section showing the swivel ing a large number of layers of a tensioned cable mounting of the service sheave in the upper'end upon a drum, the frame being so designed that of the boom; such narrow large diameter drums may be read 14 is a detail view showing the manner ily removed edgewisetherefrom, should such be 40- of Figure attaching the sling to the sheave yoke at the come necessary for servicing or other purposes. upper end of the boom; layer thereof, as frequently takes place in wind „ -Further objects of the invention are to pro vide a novel and improved construction of driv ing mechanism for the cable drums which facili Figures 15 and 16 are detail sectional views showing the mountings of the swivels for the 45 boom cable guide sheave and the boom respec tates the manufacture thereof, minimizes stresses I tively; and ' thereon under load, enables the parts thereof to Figure 17 is a detail horizontal section on the be 'readily removed for servicing or other pur line l1---|1 in Fig. 11. poses, and which is otherwise well adapted to Similar parts are designated by the same ref meet al1 of the requirements of heavy-duty ap 50 erence characters in the several figures. paratus of this type. The hoisting apparatus, according to the pres ATo these and other ends, the invention con sists in certain improvements, and combinations and arrangements of parts, all as will be here inafter more fully described, the features of ent invention, comprises a frame l, a pair of swinging boomsl 2, and cable winding drums and ydriving mechanism therefor which form a com .65 plete unit. As shown in Figure 1,v this unit is a* 2,405,578 :5 adapted to be mounted on the chassis 3 of a motor truck so that the frame of the hoisting the yoke I9, the pivot pin I8 for the service sheave passing through these bosses and being removable without disturbing the support of the apparatus extends transversely of the truck im boom by the sling. Clamps 35 are preferably mediately behind the driver’s cab 4, all of the parts of the hoisting mechanism being readily CII employed to bind together the ends of the loop adjacent to the _sheave pin I8. By this arrange accessiblefromf the rear and sides of the frame, ment, the load on the boom is divided between > and sustained by the ends of the sling at opposite The frame I comprises a pair of parallel, spaced sides of the service sheave, and the portions of vertical columns 5 at each side, each column be ing composed preferably of channel iron, a pair 10 the load sustained by the ends of the sling are equalized by the sheaves 32, especially when the of horizontal base members 6, also preferably yoke i9 swivels in the upper end of the boom, as composed of channel iron, to the outer sides of takes place while the service cable is pulling a which the lower ends of the columns 5 are riv load from a side of the boom, thus equalizing the eted, welded or otherwise iixed and a similar pair tension on all of the boom supporting cables. of horizontal members ‘I connecting the respec The ends of the sling straddle the upper end of tive columns 5 and similarly iixed thereto. Angle the boom as'the latter is raised, as shown in irons 8 extend horizontally between and connect Figure 3a, thus avoiding interference with the the tops and diagonal braces S connect the ends raising of the boom to its extreme height. An `or the upper angle irons and plates IU riveted, Outrigger leg 4!) is preferably provided for sup welded or Aotherwise ñxed to the lower portions porting the load on one or the other side of the of the columns 5. rl‘he frame is supported rigidly frame while the boom at that side of the frame on the truck chassis. ' ' is swung laterally from the truck to lift a load at The booms 2 are each pivoted on a horizontal a side thereof». Each of these legs, as shown, com pivot' I_I carried by a swivel I2 having a vertical prises a pair of telescopic sections 4I and 42 stem I3 ñtted rotatably in upper and lower plates adapted to be held adjusted to different lengths I4 bolted, welded or otherwise ñxed to the top by a pin 43 which may be inserted through holes ,and bottom respectively of the base members t in the section 4I and the appropriate pair of spanning the space between them, the booms opposite holes 44 spaced longitudinally of the being thus mounted to swing upwardly and down Wardly about the horizontal pivot I I and to swing 30 section 42. The lower section Vof the leg is pro as will hereinafter appear. laterally about the vertical stem I3 as an axis. The upper end of each boom is provided with a sheave l5l over which the hoisting or service cable I6 passes, this cable being equipped at its 'end with a hook Il or other suitable means for en gaging it with an automobile 'or other vehicle' or object to be hoisted or hauled, the sheave being journaled on a horizontal shaft I3 in a yoke’ i9 swiveled in the upper end of the boom, a cable guide I?!a being connected to this yoke for caus ing it to swivel in the end of theïboom when a load isr being pulled from- either side thereof. vided with a foot ¿I2a to bear on the ground Ywhen the leg is extended laterally of the truck and the section 42 lowered. The upper section of the leg is pivoted on a horizontal pin 45 in a swivel ¿.16 and the latter is provided with a vertical stem or journal which is rotatable in plates 23 and 25a spanning the space between and secured to the frame members 1. The universal pivoting of the legs 20 to the frame enables each leg to be extended at any angle laterally from the truck, as shown in Figure 3, to bring it beneath the respective boom and sustain a side pull or load, spreading of the lower end of the leg being pre vented by a chain 41 which may be attached to The upper end of each boom is also equipped with means'vfor attaching a boom'cable Ythereto for raising and lowering it. The boom cable 20 is attached at one end by a pin 2l to a sheave car lthe lower end of the leg and one of the base rier 22, the latter Abeing pivoted by the horizontal use it may be folded against a side of the truck, members of the frame, and when the leg is not in as shown in Figure 3a, and locked by a spring pin 23 to a swivel 24, the'latter having a hollow plunger 4B. . vertical stem 25 which is mounted rotatably in The service cable extends from the boom plates 26 which span the spaces between’and 50 sheave IS over a sheave 50 journalled in a swivel are bolted, riveted, welded or otherwise fixed to 5I' having a 4hollow vertical stem 52 rotatably the tops of the angle irons 8 and the upper and mounted in a pair of the plates 2S of the frame, loweredges of the channel irons '1. Each sheave this cable passing through the stem 52 and wind carrierhas a sheave 21 journaled therein, around which the boom cable passes, the boom cable also 55 ing on a hoisting or service drum 55. The boom passing around a pair of sheaves 28 journaled on cable passes from one of the sheaves 28 over a. f a pin 29 in a yoke 30. ì sheave 5l and downwardly through the respec The >present invention provides novel means tive swivel stem 25, then around a guide sheave for attaching the boom cable yoke 30 to the 58 and winds on a drum 59. upper end of the boom whereby the load on the Each service cable drum 55 is of relatively large diameter and of relatively short axial boom'will be distributed and sustained equally length, thus enabling a given length of cable to at opposite sides of the service sheave I5, and such attaching means will avoid fouling with the be wound thereon with a fewer number or layupper end of the boom when the latter is raised. ers of the cable than is possible with a drum of Such attaching means comprises a yoke 3I which 65 relatively small diameter, thus avoiding tend is hooked by its intermediate portion in the yoke ency of the service cable, while under load, to 30 and carries a pair of sheaves 32 which are become wedged between convolutions of an un journaled on a pin S3 in the'yoke 3 l. The sheaves derlying layer, and the narrow dimension of the '32 are connected to the upper end of the boom drum enables it to be accommodatedl between the by a sling composed of a suitable length of ilexi 70 upright columns 5 at the respective sides of the _ble cable 34 the ends of which are connected to frame. This drum 55 is mounted to rotate on or with a shaft 5B supported in bearings 60 in the form a loop, the intermediate portions of the loop being passed around the respective sheaves 32 relatively fixed plates I0 and from which it is re movable axially, and the drum 55 carries a driv and the ends of 'the loop being passed around groved segmental bosses 35 on the outer sides of 75 ing gear SI which meshes with a pinion 62 loOSe~ 5 2,405,578 6. 1y mounted on a driving-shaft 63 and is coupled thereto _by splines |63 and a clutch >collar |63a slidable thereon, the shaft 63 being journaled in 91 loosened,4 for inspection or repair of these units or adjacent parts in the frame. As the ca ble winding drum is mounted rotatably on the shaft 56 and the latter is removable axially from its bearingsdn the plates I6, this drum may be readily removed edgewise from the adjacent side bearings 64 supported by the plates _|0, and being removably retained in said bearings by a plate l 638L secured to. the end of the shaft 63 by a cap screw 63h. A band brake 65 is preferably provid of the frame after removal of its shaft. The ed for controlling the slack in the service cable, torque reaction between the casing 84 and the this >brake extending partly around the gear 6| worm wheel -|'| or '|8 while being driven by its and being drawn into frictional engagement with 10 respective worm is sustained by thrust screws it by a tension spring 66, one end of which is at 96 and 9`| which are adjustable in brackets 498 tached to the frame and the other end of which and 99 ñxed to the rear side of the main frame, is connected to an arm 6`| fixed to and projecting these screws being adjusted to bear against the radially from a shaft 68, the vlatter being mount resective ends _of the casing 8.4, although, while ed rotatably in the columns 5 of the frame and 15 -both worm wheels are being driven simultane having a yoke 69 fixed thereon and connected ously, the torque reaction upon the casing 84 in to one end of the brake band 65, the other end one direction will neutralize the torque reaction " of this band being connectedfat'fïû to a suitable thereon in the other direction, due to the oppo part' of the frame. A loop-> '|| extends radially site directions of rotation of the worm wheels 11 from the shaft 68 and is urged toward the por tion of the service» cable between the drum and the sheave 50. While theservice cable is under tension, as while a load is'thereon or this cable is being pulled to unwind it from the drum, it will engage or swing the loop -|| to rotate the shaft 68 against the action of the spring 66 and 20 drum,.but as soon as the service cable becomes 18. l - Y » of duplicate halves 84a and 84h united by ñanges 86 which may be bolted together, as shown, this design of the casing enabling a single pattern to be used for both and otherwise facilitating the manufacture thereof. The bearings83 for the worm shafts are removable axially, thus enabling the worm shafts and theworms thereon,l which are of smaller diameter than the bearings, to be 30 removed axially from the casing for servicing or slack, the loop `|| deflects the cable under the ac tionof the spring 66 and the latter rotates the shaft 68 in a direction to frictionally engage the - brake band 65 with the periphery of the gear 6|, thus avoiding over-running of the drum and consequent disarrangement of the cable thereon, The drum 59 for winding the boom cable is re movably mounted, by splines 59a, on a shaft '|5 which is journaled in bearings 'I6 supported by replacement.` The bearings- 83 are retained in the casing by end plates 8l which are bolted or otherwise removably secured thereon, these end plates sustaining the end thrust of the Worms.' In order to prevent unintentional lowering of the boom or unwinding of the service cable, due to tendency of the worm gearing to back off un der a load, because of the low resistance of »the anti-friction bearings for the worms, each of the 40 worm shafts 86 and 82 which operate the service the relatively ñxed frame plates I9, and remov and boom cable drums 55 and 59 respectively is ably retained therein by a plate ‘|6a secured to preferably provided with a friction brake which the end of the shaft 15 by a cap screw 15a. will prevent unwinding of the service or boom ' vThe pinion shaft 63> for driving the service ca cable from its respective drum, but will not in ble _drum and the shaft '|5 on which the boom 45 terfere with the normal lifting and lowering op cable drum is splined extend rearwardly from the erations of these cables. Each friction brake frame and have worm wheelsv Tl and "I8 respec comprises, in the present instance, a friction tively keyed or otherwise removably v'fixed there cone 90 which is keyed on the' respective worm on for driving them in relatively opposite direc shaft and abuts against >a shoulder 9| thereon, tions to wind lthe cables on the respective drums and an outer cone 92 which is movable axially 55 and 59. According tothe present invention, 50 on the worm shaft and is urged against the cone the worm wheel '|'| meshes with a worm 19 keyed 96 by a compressed coil spring 93 which encir or otherwise ñxed on a shaft 80, and the worm cles the worm shaft. The periphery of the outer vwheel 18 meshes with a worm 8| keyed or other cone‘92 is provided with a pair of axially ex wise fixed on a shaft 82 adjacent and parallel to 55 tending ribs 94 between which a pin’95 threaded the shaft 80. The worm shafts 80 and'82, which into the casing projects, this pin and the ribs are driven in relatively opposite directions, are .permitting axial movement of the outer cone 92 mounted in bearings 83 which sustain the radial but preventing rotation thereof, whereby the re and axial loads on these shafts, these bearings action off the frictional braking torque applied being preferably of theV annular ball bearing type 00 to the Worm shaft by the inner cone 98 will'be and mounted removably in a casing 84 which contains or encloses the worm wheels" and 18, this ycasing having bearings 85 in which the shafts 63vand '|5 carrying the worm wheels are journaled. By so mounting the worm shafts in the casing and providing the casing with bear 65 ings for the worm wheel shafts, the casing and _worm shafts are supported on or suspended from vthe worm wheel shafts independently of the sustained. ~ " ‘ The present invention provides novel and im proved transfer orv transmission mechanism whereby power may be applied to either service or boom drum or to any number or all of these drums, as may be desired. Such mechanism, as shown in the present instance, comprises pairs of axially alined shafts |09 and |0| journaled in bearings |92 and |83 respectively, which are main frame I, and by removably mounting the 70 bolted or otherwise rigidly fixed in the opposite drum 59 on the shaft '|5 and removably mount -ing the pinion 62 on the shaft 63,v the casing 84 together with thev worm gearing therein can be removed as aunit after the plates 63a and 16a - The casing 84 is preferably composed of a pair in a direction to release the brake band 65 from the gear'äl and thus avoid a drag upon the drum during lifting or lowering a load or while the service cable is being pulled manually from the and side walls of a casing |04 having a removable cover |649. ` `The outer vends of the shafts |60 are connected by couplings |66 to the worm shafts 80 which drive the drums 55 for the service cables have beenïremoved and the torque screws 96’ and 75 for the respective booms, and the outer ends 'of 2,405,578 7 8 sliding clutch members |08, |09, ||0 and ||I, re-` spectively, whereby rotation of each shaft in one the shafts IDI are connected by couplings |01 to the worm shafts 82 which drive the drums 59 for the boom cables for the respectivebooms. The inner ends of the shafts |00 have jaw clutch or the other direction by pulling or pushing its respective Bowden wire .will slide the respective sliding clutch member into or out of engage members .|08 and |09 splined thereon to shift ment with its companion clutch member. Means axially »although connected to rotate therewith, is preferably provided for yieldingly retaining and the inner ends of the shafts |0| have similar each sliding clutch memberv in engaged or dis jaw clutch members |I0 and ||I splined thereon engaged position, such means, _in the present to shift axially although connected to rotate therewith. A shaft ||2 is interposed between 10 instance, comprising a bowed spring |48 pivot ally connected at one end to a hook |49 fixedin the inner ends of the shafts |0| in axial aline the` adjacent end of the casing |04 and pivotally ment therewith, the ends of this shaft being re connected at its other end to a pin |50 fixed in> duced and journaled rotatably- in the inner ends the respective clutch shifting fork. The spring of theshafts |0|, and the shaft IIZ‘ has a jaw |48 normally tends to contract or close, thereby clutch member I i3 and a gear I I4 keyed or other biasing ,the pin |50 on the respective clutch wise fixed thereon, the gear I|4 having jaw shifting fork in a direction toward the hook |49, clutch teeth ||5 fixed thereon, the clutch mem and the hook |49 and pin |50 are so located on ber >| I3 and clutch teeth |I5 being companions opposite sides of the respective clutch shifting tothe clutch members ||0 and III respectively, and being engageable therebtT to connect the 20 Shaft that the pin |50 will move to one or the other side of a dead center position as the re shaft ||2 to the respective shafts |0I. A shaft spective shifter fork is rotated to engage or dis |16 similar to the shaft II2 is interposed be engage the respective sliding clutch member, tween the inner ends of the shafts |00 in axial each spring thus serving to yieldingly retain the alinement therewith, and has reduced ends jour respective sliding clutch member in engaged or naled rotatably in the inner ends of the shafts disengaged position. p |00, and the shaft ||6 has a jaw clutch member I I1 and a gear I I8 keyed or otherwise fixed there on, the gear ||8 having clutch teeth ||9 thereon, the clutch member ||1 and the clutch teeth on the gear ||0 being companions to the clutch b members |00 and |09 respectively, and being en The transfer mechanism, as shown, is so designed that its mechanism may be readily re moved from the casing |04 for servicing or other purposes. The bearings |02 and |03 are bolted or otherwise removably fitted in the opposite sides gageable thereby to connect- the shaft I|6 to the respective shafts |90. Power is applied to the shaft ||2 by a shaft> |20 which is journaled in a and their shafts, the latter are withdrawn from the ends of the shafts ||2 and IIB, thereby re of the casing, and by removing these bearings or otherwise fixed in an end 35 leasing these latter ¿shafts for removal freely through the open top of the casing |04 While |04, the shafts ||2 and |20 the cover |04a thereof is removed. As the slid bevel gears |22 and |23 keyed ing clutch members are splined removably _on to the respective shafts, and the inner ends of the shafts |00 and |0|, they the gears ||4 and ||8 fixed on the shafts H2 alsoare readily removableefrom the open top of and || 6 mesh with one another whereby the the casing. The axial thrust on the shaft ||2 shaft I I6 is driven from the shaft I I2 but in the from the bevel gear |22 is sustained by an anti opposite direction of rotation. The shaft |20 friction thrust bearing |55 which abuts at one preferably receives power for rotating it in one side against the inner end of the respective bear or the other direction for lifting or lowering op erations from any suitable or well known form 4.' ing |03 and at its other end against a shoulder |50 onthe respective shaft |0I, and this shaft of power take-olf from the usual truck engine, contains an anti-friction thrust bearing~ |51 as, for example, from asprocket wheel |24 driven against which the adjacent end of the shaft ||2 in one or the other direction by any usual or _abuts whereby the am‘al thrust from the.._beve1 conventional form of reversible power take-off from the transmission |25 of the truck, a chain f gear |22 is ktransferred from the shaft ||2 ¿to the bearing |2| bolted wall of the casing being connected by or otherwise ñxed |26 driven fromv said sprocket wheel, and a sprocket Wheel |21 fixed to the shaft |20. _ p Thefour jaw clutches thus _provided in the transfer` mechanism enable any one or more or all of the shafts |00 and |0| to be driven by power from the single power shaft |20, and meansris provided for controlling these clutches from a remote point, preferably the cab of the truck. Such controlling means, as shown in the respective shaft |0| and from the latter through the bearing |55 to the adjacent bearing |03. The axial thrust of the other bevel gear |23 is sustained by the inner end of the bearing I2I through an anti-friction thrust bearing |58 which is inter posed between its inner end and the gear |23. Oil Seals |59 are provided for ‘the shafts |00 and |0| whereby an oil bath may be maintained in the casing |04 and leakage therefrom prevented. ’ present instance, comprises a set of Bowden 60 In some instances, it may be desirable to tie together the upper or free ends of the booms andA wires I3I, |32, |33 and |34, the outer tubes or thus providexa rigid structure and the hoisting, casings of which areheld, kas bya clamp |35, towing, pulling orY hauling may be done conjointly on thedtop of the casing -|04 .and the inner wires by both booms, one 'of the booms being provided of whichextend into the cab where they arevcon for such purposes with an apertured lear |60 nected to levers, knobs or other appropriate con projecting from a side thereof and the other boom trol members within convenient reach of an at tendant in the cab. The other ends of the wires with a socket IISI to receive said ear when the are operatively connected to levers |30, £31, |38 boomsY are brought together, a spring actuated locking pink |92 being carried by the socket and engageable in the aperture of the ear, substan tially like the boom locking arrangement disclosed in my prior Patent Reissue No. 14,720, granted and |39 above the cover |04a of the casing |04, these levers being ñxed to the upper rends of shafts |49, '|4I, |42 and |43, respectively, jour naled in suitable» bearings in the casing |04. The shafts |40, I4I, |42 and |43 have forks |44,'|45, |46 and |41, respectively, ñxed thereon, these forks cooperating with> grooved collars on the September 2, 1919. ' The construction .and operation of the various elements of the apparatus having beendescribed ,2,405,578 9 >in detail, the general‘operation of the 'complete either or both booms and operate 'either' or both r>service for lifting'at the same time, in which event, it is merely necessary> to pullgthe ap apparatus is as follows: Normally, -or whilelthe apparatus is in transit,- both booms are preferably swung to the vrear of the truck and tied together by the locking pin- |B2,ounintentional unwinding f of the servicev or boom cables from their' drums ' ' " . ' ` The hoisting, towing, pulling, hauling or other operations may be performed either whilev the the power for these operations being .provided by’thesingle power shaft-IML »under the inñuence of the load being prevented by the friction brakes 9d, 92 on the shafts of the worms which drive the service and boom cable drums 55 and 59. propriate ones or all of the Bowden wires,qall; oi e , , In order to lower one or the> other boomor- to lower the'service cable tov which the-load is at tached, the power take-off from the triuck trans 10 mission is reversed or set tov drive vtheshaft'lZll yin the opposite direction to thatforî lifting,- and the sliding clutch member corresponding to the booms are tied together and sustain the load boom or service cable to be lowered' is engaged .conjointly, or such operations may be performed with its companion clutch member by pulling 'the by either or both of the booms operating sepa 15 respective Bowden wire,- thereby causing power rately, as while one boom is being employed to to be taken from the shaft v|20 to rotate thefre hoist, pull, haul or otherwise operate upon a load spective worm and cooperatin'g'worm v.wheel to sustained by one ofthe booms while swung to rotate the corresponding boom' drum or vservice one side of the truck while the other boom is drum in a direction to unwind the -respective boom swung to the other side of the truck and itsserv 20 or service cable, and, obviously,- one or more or all 'ice cable is attached to an anchor so that this of the boom and service‘drums may vbeadriven service cable acts as a >guy for the other boom simultaneously, if desired» the 'power therefor »whichsustains ‘the load. ' ^ being supplied from -the single. power `'shaft-'Hitt _Assuming the booms have been arranged'ap The torque reaction between the worm wheel T! -propriately for the operation to be performed, the or 'i8 and the casing 84 will be sustained -by the power take-off from the transmission of> the stops or adjustable screws 93 and Qlgwhich-abut truck will ybe put into operation for lifting, the against the ends of the respective casing 8d, al‘ power shaft |28 being thereby driven continu though `y`when bothv worm wheels-'Ill _and i8 `are ously in the appropriate direction by power taken driven -simultaneously ¿to raise the, 4resrnective vfrom the usual engine of the truck. In order to #30 boom and lift or pulla load on the. servicefcab-le lift one or the -other b-oom, the Bowden 4wire |33 or |34 is pulled, thereby shifting the respective sliding clutch member H0 or || | to couple the shaft | l2 to the respective shaft liil, in conse quenceof which the respective worm 8| will drive its cooperating worm wheel 'I8 in a direction to ro tate the boom operating drum 59 in a direction for that boom, the torque reaction on thejcasing B4 from one worm will be »neutralized> more or towind the respective boom lifting cable 20 there on, thus lifting the respective boom, and when -,such boom reaches the »desired height, the clutch i v40 member which was engaged will -be disengaged from its companion clutch member by pushing less by the torque reaction from the othernworm wheel, it being noted that the worm wheels .'|'| and 'I8 are driven in opposite> directions to windthe cables on the drums 55 and 59, res1:xectively.¿L Also, as the axial thrusts'of the worms '19 >and 8| are in oppositel directions- during theirgopera tion to raise the boom and lift the service. cable, the reactions of such aXialthrusts areï distrib. uted between the opposite vsides of ,the casing 83, thus enabling this casing to be constructed of r.el« atively light weight,~ and the torque/sustaining screws for thisy casing 'may also be lofrelatively the respective Bowden wire |33 or |34, thus stop ping> the boom lifting operation, and the boom will be held in its adjusted position by the ir reversible action of the respective worm 8| and cooperating worm wheel 18; or when both booms light weight. As each casing-84 »is mounted on the respective worm wheel shafts B3 and _15 and may each be removed asa unit therewith as here inbefore described, these- units and» also the rear side of the frame in the region in«;which.the drums 55 and 59v are located are readily made are to be raised simultaneously, both clutch mem bers _| l0 and || | are engaged at the same time. ' y After the boom employed for hoisting, pulling, hauling or similar operation has been thus ad accessible. _justed to the` desired height or angle, the ap própriate Bowden wire |3| or |32 is pulled, there ' , f , . " ` The large diameter service drums 55 employed not only enable a suiiicient length vof service cable to be wound thereon in a minimum numberof by shifting the respective, sliding clutch member |û8 or |69 into engaged position and therebyl 55 layers, thus avoiding wedging of the cable between the convolutions of the -layerslwound on vthe-drum under tension of the load, ‘butI also enable` drums _which are relatively narrower ofshort~ axial spective worm>19 and thereby drive its cooperat length to be employed. Such narrow'drums'may ing worm wheel ‘l1 in a direction to rotate the drum 55 to wind the service cable lli'thereon. 60 be accommodated in a narrow frame 'which may be conveniently mounted transversely on a truck coupling the -shaft || 6 to the respective shaft |00, causing operation- of such shaft Vto drive the re ‘Since the load to be lifted or pulled is attached .to the hook |'| on the service cable, the load will be lifted or lpulled until the respective clutch` `member |08 or |99 is disengaged from its com panion clutch member by pushing the respective Bowden wire |3| or |32, whereupon the lifting or pulling vof the load will be stopped, and the load will be supported by the irreversible action >of the respective worm -'|9_ and worm wheel 11. When both service cables are employed at the same time for hoisting, pulling or similar oper ations, both clutch members |08 and |09 are en gaged at the same time by simultaneously pull immediately behind the'cab, thus renderingr the rear side of the frame accessible for servicing of 65 the mechanism therein andl leaving the rest' of the truck body available for loading _or lother pur poses, and the narrow service drums, as well as the boom operating drums ‘59, may be-'readily removed edge wise from the respective' en_dsof the frame,l after removal of their shafts, vfor servicing or other purposes. ' ' ' The employment vof wormsand worm wheels for driving the service and boom winding drums greatly simplifies the'apparatus- since these worms and worm wheels’ are irreversible, thatv is, _the ing both Bowden wires l3| and |32. worms will hold theïworm wheels against retro, In some instances, it may be desired tolift 75 graderotation under the loads imposed upon-‘the Y:2,405,578 11 service and boom winding drums, 'and will auto matically hold the load and the boom at any~ height to which the same are lifted, thereby ob Í‘viating the necessity of employing complicated ratchets for -locking the drums, and releasing 12 companion clutchrmembers connected respec tively to said gearings, and means individual to said clutch members and companion clutch mem bers for engaging and disengaging them. 8. Hoisting apparatus according to claim 6, wherein said transfer mechanism includes means and controlling means for unwinding the cables for each of said clutches for yieldingly holding from the drums, as heretofore. Also, the present the same in engaged and disengaged conditions. invention provides a novel transfer mechanism 9. Hoisting apparatus comprising a boom, ser whereby the power for driving the drums to both wind and unwind the service and boom cables 10 vice and boom operating cables cooperative there with, drums for winding and unwinding the '-re may be derived Vfrom a single power shaft which spective cab1es,'worm wheels disposed in differ ¿may .be driven conveniently by the usual engine ent but adjacent planes land connected to the re of the truck on which the apparatus is mounted. spective drums for operating them, a casing com The present invention provides a heavy duty posed of similar halves enclosing the respective apparatus of great :power and strength for per worm wheels, and a pair of worms journaled 'in »forming efñcie?tly and rapidly a variety of oper the ends of the respective casing vhalves in -acl ations, such as lifting, pulling, hauling or towing jacent parallel relatlon and engaging the -respec disabled automobiles -or other vehicles or appa tive worm wheels. ratus, in vwhich all of the power required is sup 10. YHoisting apparatus comprising a frame, a plied from a single source and may be controlled 20 pair of booms .mounted thereon, service and conveniently, >as from the cab of a truck, and the boom operating cables cooperative with the re various parts of the apparatus are readily acces- Y spective booms, drums mounted in the frame for siblefor inspection, :removal or other servicing. winding and unwinding the cables, gearing in I claim as ~my invention: .1. 4Hoisting apparatus comprising a frame, a 25 cluding worm wheels connected to the drums for each boom and a pair of worms meshing respec boom’mounted thereon, service and vboom operat tively With the worm Wheels for the respective ing .cables cooperative with the boom, drums -for boom, transfer mechanism comprising a casing, winding the respective cables, shafts mounted on a power shaft journaled therein, a pair of driv the frame and connected to the respectivedrums for driving them, a worm wheel fixed to each of 30 ing shafts connected to the power shaft and pro vided with clutch members, pairs of driven shafts said shafts, a casing supported directly by said journaled in the opposite sides of the casing in shafts independently of the frame, worms alinement with and supporting the respective mounted in said casing and vcooperative with the driving shafts and having >sliding clutch mem respective worm wheels for operating them, and bers on their inner ends to cooperate with the 35 means -on the frame and cooperative with said .respective clutch members on said driven shafts, casing for sustaining the torque reaction of said worm wheels thereon. 2. Hoisting apparatus according to claim 1, wherein said torque reaction sustaining means comprises abutment members on the frame en gaging opposite portions of said casing. . 3. Hoisting apparatus according to claim 1, wherein said torque reaction sustaining means comprises a pair o'f alined screws mounted on the frame and adjustable into abutting relation with opposite portions of said casing. Y 4. Hoisting apparatus according to claim 1, wherein said worm wheels rotate in relatively opposite directions to operate the respective drums to 4wind the cables thereon. 5. Hoisting apparatus according to claim l, wherein said worms are mounted in parallel re lation in said casing and rotate said worm wheels said driven shafts being connected to the re spective worms, clutch sluiting means in the casing for operating said sliding clutch members, 40 and means exterio'rly of the casing and connected to said clutch shifting means for operating the same. 11. Hoisting apparatus comprising a frame adapted to be mounted transversely on a truck » Yand having `parallel upright columns providing openings vat 'the opposite ends of the frame and at the respective sides of the truck, booms swiv eled on the frame adjacent to its opposite ends, service and boom operating cables cooperative with each boom and extending into the respec tive ends of the frame, 'drums> for winding said cables movable edgewise into and out of opera tive positions between the columns through said openings at >the respective ends vof the frame, in relatively opposite Adirections to wind the re and shafts mounted in the frame for removably spectivev cables thereon, and means for sustain supporting the drums therein for rotation> in a ing the thrust of said worms against the respec common plane. ` I tive ends of said casing. 12. Wrecking >apparatus for mounting on a 6. Hoisting apparatus comprising a pair of truck transversely and behind the cab thereof, booms, service and boom operating cables for each boom, drums for winding the respective 60 comprising a 'relatively narrow frame having drums 'mounted in a common plane in each end cables, gearings individual to said drums for the thereof at the respective side of the truck for respective booms for operating them, a power winding a servi-ce cable and a boom operating shaft, and transfer mechanism interposed be cable, a boom swiveled on a vertical axis adjacent tween said gearings and driven by said power to each end of the frame> and cooperative with shaft and comprising clutches for individually said »service and boom operating cables, sets of connecting the power shaft to the respective gearings at a side of the frame and'adjacent gearings for selectively operating the service and to the respective ends thereof for operating the boom cable drums for both booms from said drums for the service cable and boom operating power shaft. 7. Hoisting apparatus according to claim 6, 70 cable for the respective booms, and transfer mechanism mounted at said side of the frame wherein said transfer mechanism comprises a midway between its ends and between said sets pair of shafts, gearing connecting them to rotate of gea-rings and connected to Said sets of gear in relativelyreverse directions, one of said shafts - being connected to said power shaft to be driven thereby, clutch members on said pair of shafts, ings for operating them. - 13. In hoisting apparatus, 'a boom, a sheave 2,405,578 14 for a service cable swiveled in the end of the boom for rotation about the longitudinal axis of the boom as a center, a boom operating cable, a supporting sheave having a shaft connected to the boom operating cable, and a sling having its ends connected to the outer` end of the boom at opposite sides of said sheave, and having a por tion thereof between its ends extending around said supporting sheave connected to the boom operating cable. ` 14. In hoisting apparatus, a boom having a sheave mounting swiveled in the end thereof for rotation about the longitudinal axis of the boom as acenter, a service cable sheave supported by said mounting for rotation on a substantially horizontal axis, a boom supporting cable, a pair of supporting sheaves having a shaft connected to said cable, and a sling having its ends looped for rotating said worms in relatively opposite directions to operate the drums to wind the re spective cables, and clutches between the power shaft and said Worms for selectively connecting the latter to the power shaft. 18. Hoisting apparatus comprising a frame, a boom pivotally mounted thereon, a service cable carried by the boom, a boom supporting cable connected to the boom, a pair of drums mounted in the frame adjacent to the pivotal mounting of the boom for winding the respective cables, a casing adjacent to the pivotal mounting of the boom, a pair of worm wheels mounted in the casing in overlapping relation and in adjacently located planes, a gear connected to one of the ' worm wheels and cooperative'with one of the drums, a shaft connected to the other of said worm wheels and connected directly to the other drum, said gear and shaft rotating the drums in sides of the service cable sheave, and having its 20 the same cable winding direction by rotation of the worm wheels in relatively opposite directions, intermediate portions extended around said pair a pair of worms mounted in said casing and of supporting sheaves. meshing with the respective worm wheels, a power 15. Hoisting apparatus comprising a boom, shaft, and worm driving shafts having means for service and boom operating cables cooperative therewith, drums for winding the respective ca 9.5 connecting them to the power shaft to rotate the worm wheels in relatively opposite directions to bles, worm and worm wheels connected to the wind the cables on the respective drums. respective drums for rotating them to wind and 19. Hoisting apparatus comprising a frame, a unwind the respective cables, power means for pair of booms pivotally mounted at opposite ends operating the worms, and a friction brake co thereof, service cables carried respectively by the operative with each worm for holding it against booms, boom lifting cables for the respective rotation independently of the power means, said booms, service and boom cable operating drums friction brake comprising inner and outer coni mounted in the respective ends of the frame ad cal members, one of which is fixed to turn with jacent to the pivotal mountings of the respective the respective Worm, and means including a pin cooperative with the other conical member to 35 booms thereon, a pair of gearings at a side and adjacent to the respective ends of the frame and permit axial movement but prevent rotation connected to the respective adjacent drums for thereof. operating the drums, a power shaft mounted in 16. Hoisting apparatus comprising a narrow termediately between the ends of the frame, pairs elongated frame, a pair of booms mounted re spectively on the ends thereof, service and booml - of shafts extending longitudinally at said side of the frame, means for connecting the shafts of operating cables for each boom, drums mounted each pair respectively to the gearings for oper in the respective ends of the frame for Winding ating the service and boom cable drums adjacent the respective cables, gearings adjacent to the to the respective ends of the frame, and means respective ends of the frame and individual to including clutches for selectively connecting the said drums for operating them, a power shaft shafts of said pairs to the power shaft. mounted between the ends of the frame, and 20. Hoisting apparatus comprising a boom, transfer mechanism mounted adjacent to and service and boom operating cables cooperative driven by said power shaft and comprising therewith, drums for winding the respective ca clutches for individually connecting the power shaft to the respective gearings, and means con 50 bles, worm wheels disposed in different but ad jacent planes and connected to the respective nected to said clutches for controlling them from drums for rotating them to wind and unwind a remote point. the respective cables, worms mounted on adjacent 17. Hoisting apparatus comprising a frame, a parallel axes and cooperating with the respective boom pivotally mounted thereon, a service cable carried by the boom, a boom supporting cable 55 worm wheels, power means for operating the worms, clutches for connecting and disconnecting connected to the boom, a pair of drums mounted the worms and power means, and friction brakes in said frame adjacent to the pivotal mounting constantly acting on the respective Worms to re of the boom for winding the respective cables, sist rotation thereof and thereby hold them a casing adjacent to the pivotal mounting of the boom, a pair of worm wheels mounted in the co against rotation under the influence of the re spective worm wheels while the worms are dis casing and connected respectively to said drums, and engaging the sheave mounting at opposite a pair of worms mounted in the casing and co operating respectively with the worm wheels, a power shaft, means operable by the power shaft connected from the power means. ERNEST W. HOLMES.