US1459032A - Portable power hoist - Google Patents

Description

June 19, 1923. 1,459,032

- R. A. NORLING PORTABLE POWER HOIST Filed Aug. 1l 1919 6 Sheets-Sheet 1 linen-?" June 19, 1923;

` 1,459,032 R. A. NORLING POR'IABLE` POWER HOIST Filed Aug. 11, 1919 'ev sheets-sheet 2 6 Sheets-#Sheet 3.

Jun 19, 1923. i 1,459,032'

' R. A. NQRLING PORTABLE POWER HOIST Filed Aug. 11, 1919 6 sheet-Sheet 4 J'une 19, v v

R. A. NORLING Y l PORTABLE POWER HOI S T Filed Aug. ll. 1919 Y f ya I A. 7 N if; 60 gg +155 p i @mma/g) N R. A.- NOR-LING POTABLE POwERHoIsT June 19, 1923.

Filed Aug. 11', 1919' e sheets-,Sheet e Patented .lune 19, 1923i l UNITE-D STATES PATENT orifice.

BINHOLD A. NORLING, OF AURORA, ILLINOIS, ASSIGNOR T INDEPENDENT PNEU- MATIC TOOL COMPANY, OFCHICAGO, ILLINOIS,

A CORPORATION OF DELAWARE.

PORTABLE POWER HoIsT.

Application mea 'August 11, 1919.. seriai No. 316,794.' i

To all whomv it may concern Be it known that I, RniNHoLo A. NoiuiiNo.

- a citizen of. the United States, residing at Aurora, in the county of Kane and State of Illinois, have invented new and useful linprovements in Portable Power Hoists,'of which the following is a specification. This invention relates to a lportable power hoist.

The main objects of the invention are as follows: rst, to locate the motor or prime mover which drives the rotary drums of the hoist proper on the outside of the drum casing, so that the motor maybe readily accessible for repair, oiling, and other attention that itmayl require, without having any of the parts of the hoist proper interfere with or hinder ready access to the motor and its parts; second, to provide a connection between the crank shaft or like part of the motor and the -main shaft of the hoist proper, so that the motor may be removed entirely from the hoist proper without dis,-

turbing any of the parts and connections of the hoisting structure, thereby permitting a replacement of a worn or injured motor by a new one; third, to provide means for auto- '.maticallystopping the motor when the rope or cable has been wound upon or unwound 4from the drum to the extent required;

fourth, to provide adjustable means for that .the starting 'valve o-f the motor is opened;

purpose, that is, to permit the operator to adjust readily the parts for stopping the motor Aat any point between where the rope orcable is wound completely upon the drum and unwound completely therefrom; fifth, to provide two vlrums, with the driving mechanism between them, so as to gain a `balanced construction and furthermore to require the use of a single cable or rope by having tlie ends\`of the ropeattached to the respective drums,' and thus permit tlie'inaximum length of cable Ywith only one strand wrapped about eac-h versing of the motor will be shifted or moved into their effective positionsbeforc and seventh, to 'provide an efficient clamp for connect-ing theV ends of the cable tothe The invention consists further in they matters hereinafter described and more particularly pointed out inthe `appended claims.

drum; sixth, to provide s means whereby the parts which effect the rei on line 4.-4 of'Fig. 3;

Figure 5 is a fragmentary end elevational view of one of the drums and showing' one end of the rope or cable clamped thereto vby a rope clamp of my invention;

Figures 6 and 7 are enlarged sectional views taken on line 6' and line '-,respectively, yof Fig. 5; p'

Figure 8 is a fragmentary horizontal sectional view taken on the indirect line 8--8 yo f Fig. 2;

Figure on line 9 9 of Fig. 8;

Figure 10 is a view of Fig. .9; l

Figure 11 is a perspective view of the shift. bar of the automatic stopping device;

AFigure 12 is a perspective view of one o the adjustable stop members of such device;

taken online 10-10 Figure 1 is a front elevational view of a Figure 13 is a perspective view of the ,rope p or cable guide and shoe of such device and showing the` two parts thereof separated ;v

Figure 1.4 is a side view of a hoist embodying the features of my invention, but showing an electric motor attached to the drum casing thereof instead of a pneumatic motor as shown in the preceding figures;

oist propen comprises a having a midframe 2, and drum covers 3`,\3 on opposite sides'thereof, the parts being secured thereto by the hoist l. proper and 'the prime mover or moto\I`\.\The hollow casing 1 Through the easing 1- extends a stationary drum shaft 5 having its the end webs 6 of the drum covers, as shown in Fig. 4. The, central portion of said shaft 5 is mounted in a supporting web 7 made part of the mid-frame 2. Located in the caisends supported inf-- clamp bolts 4, as shown.

ing 1 are two rotatable rope or cable drumsv have race-ways for roller bearings 10 bear-' ing'against the stationary shaft 5. The rollers 10 are kept in place by collars 11 secured to the hubs'9 by screws 12. 12. The shaft 5 is pressed linto the web 7 through a fixed l bushing 13 extending between the roller bearings 10 at the inner ends of the drums 8, and thus serves to prevent the drums from moving into Contact with the-central web 7. The end webs 6 are also provided with fixed bushings 14 extending inward toward the roller bearings 10 at the outer ends of the drums and serve to hold the latter from movement into contact with the drum covers 3. In short, the bushings 13 and 14 prevent the drums from movement alongthe stationary shaft 5, but do not interfere with the rotation of the drums about said shaft. Each drum 8 is provided in its outer surface with a continuous spiralj groove 15 extending about the drum from the inner to the outer end thereof and of a size to receive a rope or cable 16. With said hoist a single cable 16 is employed, one portion of which wraps in a single layer around one drum and the other portion wraps in a single layer around the other drum, with the loop at the midportion of the cable trained about a grooved pulley or sheave 17 outside of the casing 1 and journaled for rotation on a frame 18 carrying a swiveled hoisting hook 19. The looped portion of the cable"16,passes out of the'drum casing I1 through a suitable opening 20 extending across the front of the.

casing, as shown in Fig. 1.

Located in the casing 1 and extending between the drums 8, 8 below the bushing 13 is a shaft 21 arranged transverse to the drum shaft 5 and provided between its ends with a worm 22 in mesh with a worm gear 23,

keyed or otherwise fixed tb Ya shaft 24 arran ed at right-angles to land below the sha 21, as shown in Figs. 3 and 4. Said shaft 21 is supported at its ends in the casing 1 byI roller bearings25', 26 and an end thrust bearing 27 adjacent the latter, as shown in Fig. 3'. Said thrustbearing has two ball races 28 loosely mounted both inthe casing 1 and'on the shaft 21, so that said worm shaft 21 may be pulled out of the drum casl ing after the motor has been removed therefrom, without removing or disconnecting any of the other parts of the hoist. vThe l Screw 29 holds the end thrust bearing-in p lace. The mid-frame 2 has its lower portion 30 curved downward about the worm gea-r 23 to provide an -oil chamber so that said worm gear may be immersed in oil ap'- proximately up to its center, the oil sight 31 of Fig. 4 being'for the purpose 'of showing the level of oil in the easing. The shaft 24 ext-ends through the oil chamber 30 and has its ends journaled in the e'nd webs 6 of the drum covers on roller bearings 32. 32. asv

shown in Fig. 4. The worin gear 23 is eentrally located on the shaft 24. the portions of the shaft on each side thereof having gear .pinions 33 fixe-d thereto or cut integral'l with lifting weights will be changed. 'lhe worm 22 has such a pitch thatit will hold a load on the cable 16 suspended when the motor is' stopped or sluit off or removed entirely from the casing 1.

One end of the cable 16 is secured to one of the drums 8 and the other eud of the cable is secured to the other drum. ln Figs. 4.

5, 6, and 7, I have shown a method of fastening the ends of the cable to the drums. The outer hub 9 of each drum is connected with the cylindric body portion of the drlun by a radial web 36 spaced a distance inward from the outer edge of the drum, thereb)y providing an annular channel 37 having an overhanging iange 38. Extending through saidfiange is an inclined slot or passage 39 opening at one end into the channel 37 and at the .other end through the outer face of the drum. Beneath said fiange 38 at the passage 39 is a wedge-shaped lug 40, preferably formedintegral with the web 36. The outer surface of said lug 40 is inclined from the flange 38 Adownward to provide between such parts a wedge-shaped groove 41 with the passage 39 opening into the narrowest end thereof. One end of the cable 16 is inserted through the passage 39 into the groove 41 and doubled upon itself to form a loop 42, in which is placed a spool or collar 43, causing the diameter of the loop to be slightly greater than the larger end of the groove 41. The strands of the cable are laid in the groove 41 and the cable drawn tight, wedging itself and the spoolV To prevent the loop ',nther'drum 8 in the same manner. By havlng the ends' of the cable secured to the drumsy 8 at the outer ends thereof, it folion los

lows that the upper ends df the cable will vvbe farthest apart when the distance between the hoist an-d the load is the will prevent the cable from tw1sting. Thee reatest and cable is wound` on the drums, the latter' rotating in the same direction at the same speed, only one layer of cable covering each drum, the layers of cable fitting inthe spiral centric is shifted to one position. the motorv grooves 15,

.members 52, which said cylinders.

in this way preserving the cable and exerting the same power and spleedlon the same at all times.

For rotating the drums 8, 8, I provide a prime mover secured to the drum casing 1 on the outside thereof, and in the deviceillustrated the prime mover is in the form of a pneumatic motor having a' crank case 45, a crank case cover 46, and double acting cylinders 47,47 arranged V-sha-pedas shown in Fig. 1. The crank consists of a. single stud 48 formed integral vwith a counter;

weight 49 on the worm shaft 21. Saidsha'ft 21 extends outward from the front of the drum casing 1 through an opening 5() closed by a plate 51 carrying the roller bearings 25, heretofore mentioned. Said plate 51 is' secured to the drum casing 1 yby fastening also pass through a flange 53 on the crank case 45 for attaching the motor to the drum casing. In the cylinders 47 are pistons (not shown) having connecting rods, only one 54, being l shown in Fig. 3, extending to-the crank pin 48 and provided with straps 56, 57, respectively, engaging about the crank pin 48 with a bushing 58 interposed between such parts. The crank case cover 46 is provided with a tubular extension 59 extending ,outward therefrom in lalignment with the worm shaft 21 and in which is mounted a hollow shaft 60 having at its inner end a disk'or flange 61. This is located in the crank case 45 and has removable connection with the crank pin 48 in the manner shown and describednn` my co-pending application filed November 3, 1921, Serial No. 512.503, and which application is a division of the present one.

Applied about the portion of the shaft 60- in the crank case 45 between the cover 46 and the disk 61 isan eccentric 67 surrounded by two eccentric straps 68, 68 connected with valve rods 69, which have pivotal connection at their upper ends with reciprocatingvalves (not shown) of the engine cylinders,

as shown in Fig. 13.' so as to control the inlet and exhaust of motive fluid to and from The eccentric 67 has an internal diameter greater than the shaft 60, while its outer diameter is made eccentric to the interna-l diameter thereof. The eccentric. 67 is .shifted for reversing the operation ofthe motor. Thus. when the ecwill run forward and wind the cable on the drums; while, if shifted to the opposite posi-VK tion, the motor will reverseand unwind the cable from the drums. To effect the shifting of the eccentric vfor such purposes, I

scribed in detail inmy said co-pending application. Generally, this construction includes an eccentric shifter 71 slidably mounted in the hollowv shaft 60, and a rack bar 76 extending across the shaft.60 within the eccentric 67.4 This bar 76'extends through slots in the shaft 60 and engages the eccentric on the inside and supports it.. The connection between the shifter 71l and the rack bar 76 is such that the latter is moved across the-shaft 60 when the shifter is moved. thus changing the eccentricity of the parts and effecting a reversal of the motor.

For moving the shifter l71 endwise from the exterior of the motor', I provide on thc outside 'thereof a control lever 81 having the shape shown in Fig. 1 and provided at its center with a hub 82, from opposite sides of which extend the arms 83, 84. To the outer ends of .saidv arms are connected depending chains 85.I 86, havinghandles 8T, 88 at their lower ends, as shown in Fig. 1. By pulling down on the chain 85, the motor will run forward and wind. the cable on the drums 8, whereas by lpulling down lon the chain 86 ythe motor will-run reverse' and unwind the cable from the drums. -To effect this. the control lever 81 -is connected with provide the construction shown and dethe shifter 71 by the following construction, l

which causes endwise movement to be given to the shifter 71 upon the actuation of said control' lever. The huub 82 of said control lever'is rotatably mounted on the extension '59 of the crank case, there being a bushing.

vcolla 1'95 bearing against the outer end of the bushing 89, as shown in Fig, 8. The outer side of said collar bears against a shonlder formed on the hub 82. By such construction thc collar 95 is clamped between the hub 82 and bushing 8 9. and moves endwisewi'th such parts in the shifting of the member 71. On opposite sides of the collar 95 are collars 97 98, keyed to the shifter 71. The outer end 101 ofthe shifter 71 is threaded to receive a clamp nut 103. which holds the collars 95. 97, and 98 in place.; The-outer end of the hub -82 is also threaded to receive a cap member 104 to close the opening in the ino connected together by fastening lli hub. For moving the shifter 71 endwise whenthe -control lever 81 is operated, I prothe control lever 81 the shifter TlI will be moved endwise during the path of movement of the stud 105y through the spiral portion of the slot 106 and thus effect the shifting of the eccentric 67 for reversing the motor. 'The ends of the slot are made straight in order that the hub 82 may have a partial rotation without moving the meml ber 71 endwise and thus permit the shifting of the eccentric to be completed before the starting valve of the motor is opened and the motor star'ted.

The starting valve is constructed as follows. The starting valve is located between the valve cylinders 107, 107 (Fig. 1) and includes pipes 109, 110, which are coupled together at their meeting ends by a coupling member 111. Such end of the pipe 110 is provided with a tubular extension 112 arranged at right-angles to said pipe, as shown in Fig. 3. Screwed into the open end ot the extension 112 is a plug 113, which c'ar ries a nipple 114, to which is connected an air supply hose or pipe (not shown). The

.mg 113 is provided at its inner c a wall having passages 115, which open into a chamber 116 `formed in the extension 112.

v Said chamber communicates with a chamber 117 in the p ipe 110 through a port 118, which is normally closed by a valve 119. Said valve has a stem 120 shdably mounted at its inner end inthe plug 113 and at its outer end in the casing 112 and is there provided with an outwardly projecting l' 4art 121. For operating the valve, I provi e aA 'trigger 122A mounted between ears 123 on the valve casing and connected therewith by a pivot pin 124. Said triggerf122 is'provided with a depending lug 125 which operates against the outer end of the valve stem 120 for moving the valve into open posit-ion to permit motive fluid to enter the chamber 117 and thence flow into the p ower ycylinders of the motor through the -pipes 109, 110. The valve119 is `normally held in a closed position by a spring 126, located in the chamber 116, as shown. The trigger 122 is normally maintained in position with its'lug 125 out of contact with kthe outer end 1.21 of the valve stem by a spring 127, one end being connected with a lug 128 fixed on the valve casing 112 and the other end connected with the trigger 122. One of the arms 129 of the trigger is -provided at its outer end with a ball 130 retained in a socket 131 secured to the upper end of a rod 132 which extends downward towards the hub' Y The lower end of said rod is provided wlth 'a ball 133 on the inner end of a` bolt 134 clamped to an upright lug 135 formed integral withthe hub 82. The spring 127 is made strong enough not only to maintain the trigger 122 in its inoperative position, such as shown in full lines -in Figs. 1 to 3, but also to hold the rod 132 in a vertical position and thus maintain the control lever 81 in itsneutral position, such as shown in full lines in Fig. 1.' Thus, when either end of said lever is pulled downward by an assumesa position at an angle to the verti-I cal, the spring 127 always tending to restore the rod and the control lever 81 to their normal or neutral position, so that, when the operator releases his hold on the handle grasped by him, said spring will act to return the parts to the position referred to and stop the motor by allowing the valve 119 to close. y

For automatically stopping the motor when the cable 'or rope has been wound in one layer'on each drum and thus prevent damaging the cable by winding it in two layers on the drums in opposite directions, and further prevent the load being pulled up against the -hoist casing with a likelihood of injuring the same, should the operator fail to stop the motor before that happens, and also to stop thelmotor'before-/the 'cable is unwound from the drumspto its fullest extent and thus prevent theload or hook 19 -from striking the surface beneath the hoist,

as well as to stop the motor at any point between Such extremes, I provide a construction for accomplishing such purposes, one

form of which' is as follows and Vis illustrated in Figs. 8 to13. Located'in front of the casing 1 and to one side ofthe motor is a shift bar 136 having its inner end 137 arranged at right-angles thereto and extending outward therefrom. Said end 137 is provided with -a hole 138, through which extends a guide lug 139 fixed .to a web 140 on one of the drumcovers 3, as shown in Fig. 8. The opposite end of the bar 136 is received in a vertically 'arranged slot 141 opening upward through a bracket 142 ex! tending outward from the end web 6 of the` right-hand drum cover AS shown in Fig. 11, said bar 136 is vprovided adjacent its outer end with an 'elongated slot 143, through which extends a set screw 144 screwed into thebracket 142 through the slot 141 therein. Said bar 136 is provided in its upper edge nearits inner end with an upwardly openingy slot or recess 145 to re- 5 given'end\\"ise movement in both directions in a manner to be described. Located between the. drum casing 1 and the bar 136 is a stationary shaft 148 extending between the web 140 and the bracket 142, as shown .in Fig. 8. Said shaftv 148 is. cylindric and has slidably mounted thereon a guide member 149 provided with a hole `150.-through which said'shaft extends. Said guide mem- .in Figs. 8 and 9.

ber is provided at one side with outwardly extend-ing webs 151, 151 laterally spaced apart to provide a fork 'shaped member, through which passes the cable 16, as shown The outer end of the opening between the webs 151 is closed by a cap 152l secured in place by fastenings 153. By the construction described, the cable is guided so that no matter how it is pulled sideways below the hoist it does not affect the part of the cable above the guide 149, thus making 'it impossible for the cable to climb on top of the layer already on the drums or `get out of the spiral grooves`15 therein. The guide` 149 is provided o n the opposite orl rear side thereof with a curved shoe 154 shaped to lit into the spiral groove 15 of the associated drum 8, so that the guide member 149 will travel across the face of the drum 8 from one side thereof to the other alongthe stationary shaft 148 in the rotation of the drum. The cap 152 is provided with an outwardly extending lug 155 designed to contact with stop members 156 adjustably secured to the bar 136. There are two of such stop members 156, one adjacent each end of the bar 136, and as both are alike only one will'be described in detail. As shown in Fig. 12, the sto member is provided at one side thereof with a rib 157,

, from which projects a-screw-threaded stud guide 149.

158, to be extended outward from an .elongated slot 159 in the bar 136, the rib 157 being received in said slot and holding the stop member from turning. Said stop member is provided on the opposites'ide thereof with an outwardly extending lug 160 in the path of movement of the lug 155 on the cable On the threaded stem 158 of each stop. member is applied a nut 161` for clampingv the stop member to the bar 136. By having the stop member 156 adjustable lengthwise of the bar 136,`the distance between the stop members may be varied so as to vary the extent of movement allowed the cable guide 149 and thus effect the stopping of the motor at any point desired between the place where the cable is wound completelyl on the drums and unwound completely therefrom, so that the operator if he wishes the r'notor to stop after the load has been raised to a predetermined distance less than that allowed by the cable being' wound completely on the drums, may set the innermost stop member 156 accordingly; whereas, should it be desired to limit the distance that the load or lifting` hook 19 be allowed to descend, the operator may lix the outermost Astop member. accordingly, and

thus prevent the` hookfrom striking the ground or floor, as the case may be,should the hoist not be supported a suflicientdistance above the same to prevent the hook from touching'the' Hoor if the cable were unwound from the drums to `the fullest extent.

For `stopping the motor through the bar y 136, l provide the rockable rod 147. rod is arranged to extend outward from the drum casing along the side of the motor, and is `retained in fork-.like supports or lugs '162 extending outward from the casing of the motor, as shown in Figs. 1 and 2. The outerl end 163 of said rod is bent downward toward thehub -82 of the control lever 81, as shown vsubstantially in contact with the lug'164,

Saidl and the shoe 154 of the rope guide is at thef inner end of the spiral groove in the righthand drum 8. To unwind the cable from the drums, the operator pulls downward on the left-hand chain 86 by grasping the handle 88, tlfereby moviyng the arm 83 of the control lever 81 downward and the opposite arm 84 upward, carrying therewith' both lugs 164,

165 so as to bring the lowermost one 165 intoposition' closely adjacent the-end 163 ofthe.

rod 147. lThe motor starts by the opening of the starting valve 119 and to keep the f lmotor in operation the operator maintains his grasp on the handle 88 and-keeps the left-hand end 83 of the control lever in its fully lowered position, for otherwise the valve 119 lwould close bythe action of its spring 126 and the motor be stopped andthe parts returned to their neutral positions by the spring 127, should the operator release his hold on the .chain 86. As the cable unwinds, the shoe 154 travels across the face of the right-*hand drum 8 toward the outer end thereof until it comes in contact with the outermost stop member 156, whereupon the bar 136 will be moved endwise outward,

rocking the rod 147 in a direction to movev its outer end. 163 into contact with the lowermost lug 165 and acting against it to move the control lever 81 back to its neutral or central position, as shown in Fig. 1, with the result of stopping the motor. Such actionis of course strong enough to pull thehandle 88 upwardand out of the hand octlie operator. ITo wind the cable on the drums, the

ing the uppermost lug 164 into 'position to be engaged by the outer end 163 of the rod 147. When the shoe 154 reaches the inner end of the spiral groove, it moves the plate 136 endwise by contacting with the Ainnermost stop member 156, thus moving the control lever 81 back to its neutral or central position and again stopping the motor. lt is of course understood that the operation ofthe motor first in one direction to unwind the `cable'andthen in the opposite direction to wind the' cable is effected by the shifting mechanism heretofore described, which is brought into operation upon the movement of the control lever 8l. f

The drum casing 1 is provided at its upper end with a swivel hook 166 for suspending the hoist from an overhead support, said hook being provided with clamp plates 167, whereby the lsame may be connected with an `upright web168 formed on the casing. Said web is provided with a loop '169, to which a rope or chain may be attached for pulling the hoist up when being installed. The crank case 45 is provided with a screw plug 170, which when removed permits the same to. be drained of the oil therein, while the cover plate 46 is fastened to the crank case by suitable fastening members 171, as shown in Fig. 3. The web 7 of the mid-frame 2 of the druni casingis cut away at its lower end bo provide room for the worm shaft 21 and parts arranged therebelow, said web be'- ing provided at such end with` a transverse strengthening web 172. The reservoir 30, in which the worm gear 23 is mounted,` is provided with a screw plug 173, which when removed permitsl draining of the same. The crank case 45 is made to. receive a, quantity of oil for lubricating the crank shaft and 'connected parts, and 1s provided with an oil sight 174, as shown in Fig. 1. 1

Having the motor located on the outside of the drum casing 1 and being removably connected therewith, as shown in Fig. 3, it is possible to remove and attach the motor to the hoistproper without affecting or changing the construction of the .parts in the hoist casing. This, therefore, permits the use of any type of prime mover desired for operating the drums i8, whether it be in the form of a pneumatic motor, as shown in Fig. 3, or in the form of an electric motor 175, as shown in Figs. 14 and 15. When an electric motor is applied. its outer casino' is provided with a flange 176- through which is extended the fastening members 177 in the same manner as the fastening members 52. With such construction, however, it is ture shaft be in alignment with the worm shaft 21, then a flexible connection is made between the two shafts, as shown in Fig..

15. ln such case, the outer end of the Worm shaft is provided with a disk 181 having a rib 182 received in a complementary shaped slot 183 in a disk or face plate 184 in the armature shaft 185. lVhatever type of prime mover is employed, it will be noted that the same, being located on the outside of the hoist casing, may be connected therewith little difficulty and thus be readily accessible for the purpose of repair or removal without interfering with the driving connection of the drums of the hoist proper.

By providing two drums 8, 8 arranged opposite each other in the manner shown, the driving mechanism for the drums may be placed between the same, thereby not only producing a balanced construction, but also enabling the drums to be rotated in the same direction and at the same rate of speed, with the result that the action on each of the two strands of the rope or cable 16 extend- Iing downward below the hoist will beaiini p form on each and the load on the hoisting roperly andhook 19 raised and: lowered without-twisting the cable. iloreover, by the use of two drums, one layer of cable. may be wrapped upon each drum, thereby preventing injury to the cable by avoiding the `necessity of having layers of the cable wound one upon the other. The automatic stopping mechanism has the ladvantages already noted, -but it may be lwell to state that by such mechanism the motor will be stopped without any action on the part of the operator to that end,l and thus prevent damage being done to the parts or the load being handled by the hoist, should the attention of the operator be absorbed in something other than attending to his duties of operating the hoist. Other and further advantages arising outof my invent-ion will be apparent to those skilled in the art to which my invention relates. l

lVhile I have shown and described herein in detail one: form of portable power hoist embodying the features of my invention, it is of course understood that the details of construction and arrangement of parts shown may be 'variously changed and modified without departing'from t-he spirit and scope of my invention.

I claim as my invention:

1. A portable power hoist, comprising a casing, two drums therein and spaced apart endwise,vmeans in said casing for support ing both drums and having the same loosely mounted thereon, a single rope or cable for said drums and-having its ends secured thereto with the looped portion of said cable extending out of said easing, a shaft in said casing having a mid-section and drum covers on opposite sides thereof, said covers having end webs, a stationary shaft su iported by said mid-section and the end webs of said.- drum covers, two drums loosely mounted on said shaft, one in each drum cover and completely enclosed., thereby, a

' single rope or cable for said drums and having its ends securedthereto with the looped' portion of said cable extending out of said casing through slots in said drum covers, a second shaft arranged transversely-to the first and journaled in said mid-section between 'said drunis,al motor secured to the mid-section on the outside thereof and connected with said second shaft for 'rotatingthe same, and power transmitting means in said mid-section below said second shaft and connecting the same with both drums vfor rotating them in unison.

3. A portable power Ihoist., comprising a casing having a mid-section and drum covers on opposite sides thereof, said covers having end webs, a stationary shaft sup- Y ported by said mid-section and the end webs of said drum covers, two dii-'ums loose-ly mounted on said shaft, one in each drinn cover and completely enclosed thereby, a single rope or cable for said drums and having its ends secured thereto with the looped port-ion of'said cable extending out of -said casing through slots in said drinn covers, a second shaft arranged transverse to the first and journaled in said mid-'section between said drums, a motor secured to said midsection on the outside thereof and connected with said shaft for rotating the saine, athird shaft below the second shaft and arranged parallel to the first shaft below said.

second shaft and having its ends journal'ed in the adjacent portions of said drum covers, and a gear train connecting the second shaft with both drums through the third shaft for rotating said drums in unison.

4. A portable power hoist," comprising a casing, two 'hoisting drums rotatably mounted in said easing and spaced apart endwise, eah'drum having gear teeth at its inner end, a worm shaft mounted in said casing and extending between Vthe-ends of said drums, a second shaft arranged transverse to saidV wormfsha ft, Ia worm gear secured to said second shaft and meshing -rwith the worm on. said Worm shaft, said second shaft being .provided with gear teeth meshing with the gear teeth on said drums,'and amotor for rotating saidwornisliafh A portable power hoist, l'comprising -a casing, a stationary shaft mounted therein, two hoisting drums rotatably mounted on said shaft and spaced apart endwis'e, each di'um having gear teeth at its -inneil end', a worm `shaft mounted in said easing and extending betweentheends'of said drums and arranged transverse to'said stationary shaft, a third shaftinounted in said casing and arranged transverseto said -worni shalt a Worin gear on said third shaft and meshino with the worm on said worm shaft, said third shaft being provided with gear teeth meshing with the gear teeth on said drums` and a motor for rotating said worin shaft. 6. A portable power'hoist,comprising a hollow casing having a mid-section and.

drum covers secured thereto on opposite sides thereof, a vstationary shaft located in said casing and being supported by said -inid-section and said drum covers, two hoisting drums 'rotatably' mounted on said shaft and spaced apartl endwise, each drinn having an annular flange at the inner end thereof, saidfiange having gear teeth thereon` a vworm" shaft inountediin said easing below l said stationary shaft and arranged transverse thereto. a third shaft journaled in said mid-section beneath said `worni shaft and arranged transverse thereto, a worm gear secured to said third shaft and meshing with the worm on said worm shaft` said third shaft having gear teeth on opposite sides `of the worm gear thereon and meshing y with the gear teeth on said drums` and a motor for rotating said 4worm shaft, said motor being secured to andlocated on the outside of said casing. y y

A portable power hoist` comprising a casing, hoisting drums rotatably mounted therein and having a cable to be wound `upon and unwound therefrom, a. ,motor secured to .saidvcasing for operating said drums, a member engaging said cable and having connection with 4onezof said drums so as to be moved endwise thereof upon the, rotation of said drum, and means interposed between said member and said motor for stopping the same when t-he cable has 'been wound uponor unwound from said drums to a predetermined extent.

8. pnrtable power hoist, comprising a casing, two hoisting drums rotatably7 mount' IZA,

izo

connected with said plate and adapted to be engaged by 'said member for moving saidplate endwise, and means interposed between said plate and said motor for stopping the sainey when said member moves said plate. Y

t). A portable power hoist, comprising `a casing, two hoisting drums rotatably mount- .ed therein and having spiral grooves to receive strands of cable lconnected with said drums, a motor for operating said drluns and connected with said casing, a manually operable control lever carried bythe casing of said motor for starting the saine, a cable guide engaging said cable and having a shoe extending into the spiral groove of one of said drums, an endwise movable plate mounted on said lcasing, stop members ad- ]ustably connected with said plate and adapted toV be engaged by said cable guide for moving said plate, a rod i-o'ckably mounted on the motor casing and having 'one' end engaging said plate and the other end adapted to engage said control lever for stopping the motor when said cable moves said plate. v, I

l0. A portable power hoist, comprising a casing, t-wo hoisting druins rotatably mounted therein and having spiral grooves to receive strands of cable connected with said drums, a motor for rotating said drums` and secured to and located on the outside of Vsaid casing, a manually operable, ontrol Ysa position.

lever carried by the casing of said iuotor for startingvthe saine, a cable guide engaging said cable and having a shoe extending into thespiral groov. on one of said drums, an endwise movable plate mounted on said casing, stop members adjustably connected with said plateand adapted to be engaged by said cable guide for moving said plate endwise, a rod rockably mounted on the. casi L ing of said motor and` having one end en- -a. lug securedto said drum beneath said flange and having the outer surface thereof inclined to provide a wedge shaped recess between the same and said tiange to receive a loop provided at the end of said cable, and a member insertible inthe loop at the. end of said cable for permitting the loop of the same to be drawn tightly in said wedge guide.

shaped recess, and. means for holding the loop of said cable in said recess.

12. A portable power hoist, comprising a casing having a imid-sectionA and drum covei's secured thereto on opposite sides thereof, said mid-section having a portion extending below said drum covers and forming a chanibei', said diiiin covers having end webs and parts closing the sides of said chamber, a stationary shaft extending through said mid-section and having its ends supported by the end webs of said drum covers. two drums loosely mounted on said shaft, one in each drum cover and completely enclosed thereby, a single rope or cable for both drums and having its ends secured thereto with the looped portion'extending out of said casing through slots in said drum covers, a second shaft jouriialed in said midsection transverse to said first shaft and extending between said drums, a motor secured to said mid-section and connected with said sccoiul shaft for rotating the same, a third shaft in said chamber parallel with said first shaft and having its ends journaled in the parts ol" the drum covers at the sides of said chamber, and agear train connecting f'aid second shaft with both drums through said third shaft for rotating said drums.

I3. A portable power hoist` comprising aA casing having a mid-section and drinn covers secured thereto on opposite sides thereof, said mid-section having a center web with a fixed sleeve, said drum covers having end webs, cach having a fixed sleeve aligned with the sleeve of the midsection, a stationary shaft extending through the sleeve of the mid-section and having its ends in the sleeves of said drum covers, two drumsv loosely mounted on said shaft, one in each lill) drum cover and completely enclosed thereby,

antifriction bearings carried by said drums and engaging said shaft inside of said sleeves, the latter preventmg the drums mov- `ing into contact with the webs of said midsection and drum covers, a single cable for said drums and having its .ends secured thereto with its looped portion extending out of said casing through slots in said drum covers, a shaft journaled in said mid-section between said drums, a motor secured to said mid-section on the outside thereof and connected with said shaft for rotating the saine,` and power transmitting means connecting Said shaft with both drums for rotating the same in unison. i

14. A portable power hoist, comprising a casing having a mid-section and drum covers with end webs,said covers being secured to said mid-section on opposite sides thereof, a stationary shaft extending through said mid-section and havin its ends supported by the end webs of. said drum covers, two drums with spiral grooves loosely mounted on said shaft with a drum .in each drum moved endwise of the latter upon rotation` cover, a single rope or cable for both drums surroundingthe same to permit only la sinf gle layer of cable being wound thereon,l a second shaft lin said casing between said drums, a motor secured to said mid-section on the outside thereof and connected with said shaft for rotating the same, and ower transmittin means in said casing an connecting sai second' shaft with both drums for rotating the same in unison.

15. A portable power hoist, comprising a hoisting drum, a cable therefor, a support# ing structure for said drum, a motor for operating said drum and carried by said supporting structure, and means including a. member engaging both cable and drum and thereof for automatically stopping said motor after the cable has been taken up or played out to a predetermined-extent.

16. A portable power hoist, comprising a hoisting drum, a cable therefor', al supporting structure for said drum, a motorfor operating said drum and carried by said supporting structure, and means including a member engaging both cable and drum and moved endwise of the latter upon rotation thereof for automatically stopping said motor after-the cable has been taken up or played out to a predetermined extent, said stopping means being adjustable for vary ing .the extent of take up and play out of said cable. A

In testimony that I claim the foregoing as my invention, I affix my signature, this 9th day of August, A. D. -1919. i

`REINHOLD A.AN0RLIN|G.

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