US1670734A - Electric hoist - Google Patents

Description

May 22, 1928.

G. E. MOORE ELECTRIC HOIST Filed Oct. 1, 1924 '7 Sheets- Sheet 1 (for a May 22, 1928. 1,670,734

- G. E. MOORE ELECTRIC HOIST Filed Oct. 1, 1924 '7 Sheets-Sheet 2 hwemm' E ficorgeildmqrnoom 9M a."

May 22, 1928. 1,670,734 G. E. MOORE ELECTRIC HOIVST Filed 001:. l, 1924 '7 Sheets-Sheet 3 May 22, 1928. 1,670,734

, G. E. MOORE ELECTRIC HOIST I Filed Oct. 1, 1924 '7 Sheets-Sheet 4 1mm Mok" GaorgcEwm- Moore May 22. 1928.

G. E. MOORE ELECTRIC HOIS'I.

7 Sheets-Sheet 5 Filed Oct. 1, 1924 vw mm mm. 0Q mwf 6 J Wu B L l May 22, 1928.

G. E. MOORE ELECTRIC HOIS'I 7 Sheets-Sheet 6 Filed 001.. 1, 1924 yiokzf/m May 22, 1928. 1,670,734

G. E. MOORE v v ELECTRIC HOIS '1 Filed bet. 1, 1924 v 7 Sheets-Sheet 7 Patented May 22, 1928.

UNITED STATES PATENT OFFICE.

GEORGE EDWARD MOORE, 0F 'MUSKEGON, MICHIGAN, ASSIGNOR '1'0 MANNING, max- WELL & MOORE, INC OF NEW Y ORK N'. Y., A CORPORATION OF, NEW JERSEY.

ELECTRIC HOIST.

Application filed October 1, 1924. Serial No. 741,098.

This invention relates to an electric hoist, of the type WhlCh may be either attached to an overhead beam or other support or equipped with a trolley to run on the lower flanges of an I-beam, or similar support.

In hoists of this character, it is an accepted feature of their design that they must occupy as little height as possible and, for service, under the conditions to which they are subjected it is desirable that the diameter of the hoisting drum over which the hoisting ropes or cables are wound should be at least twenty-four to thirty times the diameter of the cable. Also the hoist should be as compact as possible and at the same time the parts thereof be readily, accessible for inspection or repair. Hoists have been made in which the drum over which the cables are wound is in alinement with the motor and a gear reduction box is located adjacent the end of the drum away from the motor and, while this construction reduces the height of the hoist, it results in an abice, extremely high strains in the parts sothat gears and shafts must be made of high priced alloy steels, specially heat treated, in

order: to enable them to stand up when in and the constructions embodying the same occurring in the rope or cablebythe short bending made by a smalhdiameter' drum. Still others-make a drum of short length and coil the rope or cable in overlapping coils on the drum. This is very objectionable as ropes or cables subject to tension are easily weakened on account of the stresses set up when so wound on the drum.

equipped with a brake of some sort to control the rotation of the drum and this brake should be subject to control at a distance from the hoist.

It is a primary object and purpose of the present invention to provide a novel construction and design of hoist operated by an electric motor-wherein minimum height, the most compact. assembly of parts possible, a drum of proper diameter with respect'to the rope or cable used thereon, machinery easily accessible for inspection or repair, a novel form of brake control for-the hoist and one readily controlled at a distance from the hoist, and a hoist which is capable of manufacture in any of the various sizes desired from smallest to largest with no changes except dimensional changes for I the different sizes is produced; and this 1n a practical and-economical manner 1113.0

cordance with the best of engineering prac-' tice, with gears and shafts and other parts made of ordinary commercial forged and cast steels not requiring any special highpriced material or special treatment whereby the cost of manufacture is increased or factors are introduced which, if not correct-in all respects, are a source of weakness rather than strength in the design. It has been the controlling thought in the construction of this. electric hoist to produce one which in its simplicity and soundness of design is as 262111" perfect as possible and a classic in its For an understanding of the invention reference may be had to the following description taken in conjunction with the ac- I looking at the right hand end of the same as it appears in Fig. 3. I

.Fig. 5 is a vertical section on the plane of line 5-5 of Fig. 3.

Fig. 61. is an end elevation with parts hoist, and

of construction wherein a chain is used in' place of a rope or cable.

Fig. 10 is a vertical section on the plane of line 10-10 of Fig. 11.

Fig. 11 is a plan of the different form of Fig. 12 is an elevation of the different form of hoist similar to that shown in Fig. l of the first hoist described.

Like reference character refer to like parts in the different figures of the drawings.

In the construction of this hoist, a main frame member is provided integral with which is a gear box 1 from which a vertical web 2 extends at right angles the same being reinforced by an upper flange 3 (see Fig. 2) and a lower oppositely extending flange. 4, the web at its outer end. being formed, as shown in Fig. 3, and terminating in an end portion 5 which is positioned vertically and in substantial parallelism with the sides of the gear box. The gear box 1 is open at its under side but extends down far enough that bearings for the various shafts on which the gearing and the drum are mounted are provided above the'lower edges of the gear box, this being best shown in Fig. 6. A bearlng 6 is formed at the edge of the end portion 5, a rod or shaft 7 on which the grooved hoist-- ing drum 8 is mounted passing through the bearing 6 and a suitable bearing 6 (see Fig. 3) in the gear box 1.: This rod or shaft is held against rotation by a set screw 9 which passes through the bearing 6 and at its end seats in a recess in the shaft as fully shown in Fig. 3. This shaft is bored at each end for a distance to make a central opening 10 from which a lateral branch 11 is made to the outside of the shaftand to the bushings 13 around the shaft, which are carried in the hubs 'at the ends of the cable drum 8. Any usual form of grease cup.12 is screwed in each end of the shaft 7 so that thegrease may be forced through the passages 10 and 11 to the bushings for proper lubrication.

It will be noted that the shaft 7 is a plain cylindrical rod and in practice it is cut from the proper stock of cold rolled steel rod, re-

quiring no-outside machining.

At the end of the drum 8 within the gear box '1, a gear 14 is secured being keyed onto the end of the drum. An electric motor 15 is located on the side of the'Web 2' opposite the drum 8 and is-secured by bolts 16, as shown. in Fig. 2, the drum and the motor being positioned as closely to each other as possible with web 2 between. The front armature shaft 17 of the motor extends through the adjacent side of thegear box and is equipped with a pinion 18 which in turn meshes with a somewhat larger gear 19 keyed to an extension 20 of the hub of a pinion 21 which lies alongside of the gear 19, this extension of hub 20 of the pinion being mounted on a bushing 22 around a shaft 23 passing through the opposite sides of the gear box. Asshown in Figs. 7 and 8, the inner end of the rod or shaft 23 has a short key-way 24 cut therein into which a pin 25 passes, the same extending upwardly from the lower edge of the lower side of the gear box to the key-way slot 24. A cotter pin 26 is then passed through the projecting end of the shaft 23 whereby it is evident that this rod or shaft 23 can have no longitudinal movement. The outer front end of the rod or shaft 23 is equipped with identically the same lubricating means heretofore described with reference to the shaft 7, that is, passages lO and 11 leading to the bushing 22' g and a grease cup 12 screwed into the rod or shaft 23. The pinion 21 meshes with a gear 27 of substantially the same diameter as the gear 14 heretofore described. Gear 27 is keyed to a projecting hub 28 extending from a pinion 29 lying alongside the gear 27 and this pinion 29 with its projecting hub is mounted on a bushing 30 through which a shaft 31, similar in all respects to the shaft 23, extends. The pinion 29 meshes with the gear 14:. There is thus provided a gear reduction between the motor and the drum 8. It will be noted that all ofthe gears, wit

the exception of the one on the armature shaft 17, are straight spur gears and thatall are equipped with bushings turning loose on the shafts 23 and 31. The shafts are fixed and are subject to almost uniformally distributed bending and shear strains only so that their diameter can be at a minimum. The keying of the gears onto extensions of the pinions or drum is an advantage in that the diameter at which the key is placed is large in comparison with what it would be if the gears and pinions were keyed separatcly to their shafts, this reducing stress on the keys to a comparatively low figure. By this means the pinions can be made of the absolute minimum diameter consistent with ample wearing area and strength and it is evident that a minimum of space is taken up by the gearing as all of the gears and pinions are located closely together, as shown in Fig. 3, and no waste space appears. The

reductions are proportioned so as to occupy the minimum length consistent with having the drum' as close to the motor as possible. the location of the first reduction back-of the motor pinion giving a great latitude in cheaper and better as the strength of a Sta-- tionary shaft is greater than that of a rotatmg shaft. The gear case 1 is equipped with a lower cover'32 which may be detachably connected and held in place by bolts 33. But two of these bolts are shown as they have only to carry on the weight of the gear case cover 32. It is evident that the cover 'may be removed at any time and the hoist operated, this being sometimes convenient during tests or to investigate any suspected faults in the construction. Y

Two spaced apart bosses 34 are cast integral with the frame at the upper side thereof, as shown in Fig. 1, through which a rod 35 passes. This rod also passes through a sleeve 36 located between the bosses 34 integral with which are opposite, outwardly and upwardly extending arms or ribs 37 connected b an integral web 38. At the upper ends of the ribs 37 bearings are provided for the rigid mounting of shaft pins 39 which extend upwardly and inwardly toward each other. Flanged rollers 40 are rotatably mounted on the free ends of the shaft pins and are adapted to bear against the upper sides of the lower flange of a horizontally mounted over head I-beam 41. This provides a trolley construction for mounting the hoist for movement in a hori-' zontal plane along the I-beam support. The

' .rod 35 is located as closely as possible directly over the eenterof gravity of the hoist.

At the lower side of the frame and in. .front of the ledge or flange 4 a bar .42 of metal is secured by bolts 43 to said flange.

This bar is of flat rolledv steel and is used.

instead of casting the same integral with the frame because of the superior reliabilit of rolled as against cast metal under higl bending stresses and, further, because of the at its upper side by a guard 46 of conventional construction to insure the cable staying on'the roller. The ropes or cables 47 used pass over the roller 45, the two strands then passing downwardly under two grooved pulleys 48 which are mounted on a fixed shaft similarv in construction and mounting to the shafts 23 and 31. This shaft is mounted at the upper end of a housing 49 from which a hook 5O depends. The strands of the cables 47 after passing under the pulleys 48 are thence carried upwardly to the drum- 8- and wound around the same in the grooves shown as formed inthe drum. 'It is apparent that the windings of the cable or rope around the drum do not contact with each other, the drum being of sufficient length to carry all windings of the rope for any vertical lifts for which the hoist may be designed.

The rear armature shaft extension 17 has a brake drum 51 keyed or otherwise secured thereto. A bracket 52 is permanently secured to the off-set portion of the vertical web 2, shown in Fig. 3, by bolts and extends outwardly over the brake drum. At its end Two brake shoes 57 and 58 are pivotally connected at their upper ends, at 59 and 60,

respectively, to the bracket 52 and pass downwardly at opposite sides of the drum 51. These shoes are lined with woven asbestos material, indicated at 61, which bears directly against the surface of the drum. At its lower end the shoe 58 is connected, at 62, to an'upwardly' extending lug formed on a horizontally positioned lever 63 which extends to and-at one end is pivotally connected, at 64, to the plunger or core 54. The lower end of the other shoe 57 is pivotally connected. at 65, to a member 66 which in turn is adjustably connected with a pin 67. which is screwed into the member 66 at one end and pivotally connected by pin 68, at its opposite end to the lever 63. It is evident that when no current is passing through the motor and solenoid, the weight 55 serves to .draw lever 63 downwardly and tighten the linings of the brake shoes against thev drum therebyputting a check on its rotation; and when the mdtor is started, with a coincident passageof the electric current through the solenoid coil, plunger 54 being elevated releases thebrake shoes from bear ing engagement with the drum 51. At the free end of lever 63 a rope 69 is attached whereby the brake may be operated 1nanual- 1v from below the hoist whenever it is desired. Since the brake shoes when released from thebrake drum are free to'swing in their upper suspension pins 59 and 60, and one of the shoes might drag on the brake while the other opened .to' a greater extent than was needed, easilyadjustable stops 70 and 71 are connected to the' solenoid casing and the web, 2 respectively, as shown in Fig. 5, which prevent outward movement of either brake shoe beyond a predetermined point, said shoes being provided with reinforced ribs 58 having shoulders in direct opposition to the stop members 70 and 71. This is desirable and in fact necessary in view of the fact that the length of the stroke of the solenoid magnet is very limited and must be made the most of. As the brake lining wears it'is clear that the plunger or core 54 will have .to descend lower in order that the shoes grip" the drum, this making its stroke longer and the releasing pull of the solenoid when the currentis turned on initially weaker, requiringthat frequent adjustment of the shoes for wear be made.

With this brake the load suspended from the hook 50 is held against movement when the current is turned off and the motor stopped. The brake is released when the current is turned on with either the hoisting rection with a suspended load carried on the.

hoist, there is nothing in this construction so far as described to prevent the load fromat once starting to fall with great rapidity. And this would, when the speed reached a certain point, act to destroy the motor due to centrifugal force on the armature coils. To give lowering control and protection against excessive lowering speed a governor is used in conjunction with the brake. From the drum 51 two pins 7 2,-located diametrical- 1y opposite-each other on the drum, project outwardly onflwhich, beyond the drum, two governor shoes 73 are pivotally mounted being faced on their outer. sides by woven asbestos material 74 and normally -drawn toward each other by a coiled spring 75, as shown in 1 Fig. 4. A stationary cylindrical housing 7 6 surrounds the shoes 73 and has an integral bracket extension 77 bolted securely to the web 2 of the hoist frame so that the housing is held rigidly in relation to the frame of the hoist. This housing is provided with radiating fins for the quick disposal of heat caused by friction of the brake shoes against its inner side.

The governor brake shoes with the spring connecting them provide a unit of a very simple construction which can be readily applied to the pins 72 and which is very effective in action. The weight and location of the center of gravity of the shoes is accurately determined so as to be able accurately to figure the centrifugal force that each will have at diil'erent speeds; and the spring is then so proportioned.that when stretched to hold the two shoes together it the motor. 'However a greaterspecd will cause the shoes to move outwardly against the tension'of spring 75, flying out so as to bring the braking material 74 against the inner sides of the housing 76 and thus put a dragon the motor armature which will prevent the speed thereof from beconiing excessive; The manner in which the shoes are pivoted 'on'the brake drum 51 and connected by a single spring makes it impossible for one shoe to have a greater force against the housing 76 than the other, because, as the shoes are duplicate and held back by the same force, the centrifugal force in each available for braking must be the same.

shoes is sufficient to prevent the full load on the hoist from revolving the armature any faster, even if assisted by' the current in the motor. Thus the governor absolutely prevents even a momentary excess in lowering speed with possible damage to the motor. Two and one-half times the normal full load speed of themotor issubstantially the limit of speed which the motor armature will safely withstand and this may be safely permitted when the motor is direct current and series-wound, both when elevating the hoist orwhen lowering any load. v

It will also be noted that when the gorernor shoes -.73 with their lining 74 are bearing against the stationary housing 76, it forms in efi'ect a temporary third bearing for the armature shaft which has a .steadying effect and prevents vibration at high speed with consequent wear on the adjoining'r'notor bearing. It will also be noted that if the governor spring should gradually become weaker no detrimental effect will be had, as this will only cause the governor to act earlier than before and checkthe lowering speed sooner, while if the spring 75 should break, the governor shoes will begin to act at once as soon as the shaft begins to j use 'two and one-half times the hoisting speed revolve, resulting in even greater safety as the maximum lowering speed would be considerably diminished with no possible harm resulting; and any such defectcan be detected practically instantly and a new spring installed.

By thus limiting the lowering speed to and equal to the non-load hoisting speed which would be attempted with a direct series wound motor, a large measure of-lowering control is secured. The operator with this. hoist, to lower, moves the controller either to the full current point on the rheostat, or at any one of the resistance points thereof, thereby releasing the magnetic brake and allowing the load to descend at whatever speed it may attain. This speed will increase until' the critical point is reached where it automatically comes under control of the governor, and beyond which speed it cannot go. The load is stopped Within an inch or two of the point It is desired to reach and thereafter lowering proceeds by series of momentary current impulses which moves the hook a fraction of an inch at a time.

The hand control operation of the brake by means of the rope 69 is of value where extreme delicacy of control in lowering is required and this, in conjunction with the 'governor, permits the very nicest lowering control w1thout current on the motor. It is necessary however from the point of safety that the hoist be equipped with the governor as aninexperienced or careless operator, by'allowing the lowering speed to become excessive with a load, will destroy the motor armature, but even if such operator should fail in properly hand controlling the brake the governor automatically stops the motor from runnin beyond a predetermined safe speed of su stantially ,two and one-half times its normal full load speed.

Therefore, with thisapparatus of extreme simplicity, the greatest nicety of lowering control can be obtained merely by the attachment of a depending cord or rope; and without the attachment of this cord a measure of lowering control sufficient for all but very exceptionable circumstances is attained. At a considerable extra cost and with seri ous drawbacks the ordinary dynamic braking used many times with hoists of this character could be usedwhich would give but slightly greater measure of lowering control than can be obtained by this structure Without the rope or cord 69 but not nearly as great as can be obtained with it. This is a very important feature of the invention, on account of its practical proved results, its extreme simplicity and economy in manufacture.

The construction of hoist shown 1n Figs.

,l to inclusive gives all of the advantages and results set forth in the statement of the invention made preliminary to the description of the construction. The frame, as a single casting, is readily produced and requires but little machining. The construction is very compact, the motor and drum being located as closely as possible to each other and the hoisting cables or ropes 47 depend from the drum on the side nearest the vertical web 2 of the casting, passing over the block equipped with the hook 50 and thence coming back over the roller 15 at a point distant from thecentcr of gravity of.

the hoist substantiallylequal to the distance of the cables 47 from said center of gravity at the other side thereof. This balances the 'construction. Assuranceis provided againstthe excessive speed in a very simple and economical manner. are of a most economical form but are fully capable of withstandin all stresses to which they may be subjecte in service. Every part of the machine is in accordance with the best accepted engineering practice. All parts are easily accessible for inspection and repair. And in every'way the construction is designed to combine simplicity, economy and practicability. That this is so has been extensively proved in actual practice.

In Figs. 9 to 12 inclusive, a different design of hoist is shown though it has all of the advantages of the one previously described with reference to Figs. 1 to 8 1nelusive. This'second hoist, instead of being equipped with wire hoisting ropes or cables,

-uses ordinary crane chain for the yertical is flanged at its upper and lower sides and free end for. strength and reinforcement. In addition a housing 78 is cast integral with the frame on the side thereof opposite where the motor 15 is connected. This housing covers an elongated sleeve 80 mounted on suitablebushings on a shaft 81 which The gearing and shafts.

passes through the gear casing,- beingsupported thereby at one end and at;the oppositeend being supported in the 'end' of the housing 78. A gear 79 is fixed at one end of the sleeve 80 and, to all intentsand purposes, is equivalent tothe gear 14: fastened on the end of the drum 8 in the first described construction. It is one of the train of gears interposed between the motor 15 and the sleeve 80 fordrivingthe latter from the ,the chain thence passing upwardly and over the sprocket wheel 82. The end of the chain after passing over sprocket wheel 82 is looped back and the end link thereof is secured between two ears 85 extending outwardly from a block 87 which is positioned vertically and at its upper end is mounted on a rod 87 passing throughbosses formed at the upper ends of spaced apart vertical webs 88 cast integral with the frame of the hoist under the housing 7 8, serving to reinforce the vertical web 2 of the hoist frame against any eccentric stresses which may arise in service. An upper hook support 89 .is shown attached at the upper side of the vertical web'2, as near as possible over the center of gravity of the hoist and practically directly over the'lower load carrying hook 50. Of course, this hoist could be made to traverse a horizontal beam like the I-beam 41 quite as well as the first described hoist,

- and such first hoist can be-equipped witha or attached hook like that at 89 if it is not desired that the hoist shall-have horizontal movement.

In this design of hoist, the solenoid magnet 53 is placed on the side of thewebopposite to the side at which the motor is attached, there being space for its reception due to the elimination of the long drum. The housing 76 for the governor brake shoes is mounted directly opposite the solenoid magnet, bein fixed to the web 2 near its outer end. he brake shoes 57 and 58, instead of being suspended from an over head bracket as in the first described structure, are suspended from pins 59 and 60" which in turn are .connectedto the upper side of the housing 76 and extend inwardly toward the motor. The supports for the adjustable stops and 71 are conveniently cast with to the relatively stationary motor housing 76. Lever 63 connected at one end to the solenoid core or plunger 54 is similar in most respects to the lever 63.

It does not show an extension for the attachment of a' depending cord or rope for manual control of, the brake though it is obvious that this extension and the cord attached thereto can be used if desired.

inforced by ribs such as indicated at 88,

this permitting the integral casting of the block or projection 83 to which -the end link of the chain 84 is secured whereby the load reacts directly on the frame. The manner of attachinent ofthe chain, which is by re cessing the projecting block 83 to snugly aecommodate the end link of the chain and a portion of the second link and attach the same by the plate shown which may be slotted to receive and accommodate the top of the second link, is of advantage because itenables the user to fit a newchain on his hoist without having to forge end links for connection. For different classes of service one of the hoists may be preferred over the other the 1 chain type being useful where rough usage occurs which would be fatal to the much more delicate wire rope or cable. The chain hoist has a further advantage in that there is no space limit to the vertical lift, such lift being available to any height so long as suflicient chain is provided for it; while with the wire cable hoist the limit of vertical lift is governed by the length and diameter of the drum, this governing the amount of rope or cable that can be carried on the drum.

The constructions described areboth very slmple, practical, durable and sizes. The invention is defined inthe claims and "is to be considered as; comprehensive of all forms of structure coming within their} scope.

I claim: 1. In an,clectric hoist, asupporting frame lncluding a vertical Web, an electriemotor located atone side and fixed to the web, a hoisting drum rotatably mounted at the opositeside of the Web on said frame, gearing Between thcmot'or shaft-and drum for drivmg the drum at a reduced specthhoisting ropes wound on the drum and depending therefrom, a pulley block-through which I efficient-.- 'The r productlon has been the result of an described hoist. The vertical web 2 is rethe ropes pass, a pulley mounted at the lower.

part of said vertical web over which the rope. passes and a har fastened 'to and paralleling the lower edgemf the web on which said pulley is mounted, substantially as described.

2. In an electric hoist, in combination, a supporting. frame including an integrally cast gear box and a verticalweb extending to one side thereof, an electric motor fixedto the web at one side and having its armature.

shaft extending into the gear box, a pair of shaftsvmounted in and extending between the sides of the gear box, means for holding said shafts against rotative movement, one of said shafts being located at one side of the armature shaft and the other at the other side of said shaft, a 'rotatably mounted hoisting member carried bythe web and outer side of the gear box on the side of the web opposite the motor, said hoisting member having a gear at one end located within the gear box and extending toward the last mentioned shaft, and reduction gearing interposed between the motor armature shaft and the gear on the hoisting member for driving said hoisting member from the ehctric motor.

3. In an electric hoist, a frame including agear box and a vertical web extending therefrom, an electric motor fixed tofthe web at one side thereof having one end of its armature shaft extended into the gear box,

' a pinion on the end of the armature shaft,

a shaft mounted on and extending between the sides of the gear box a distance from the armature shaft, a second pinion having an extended hub loosely mounted for rotation on the shaft, a gear keyed 'to said hub extension of the pinion andmeshing with the armature shaft pinion, a second shaft at the opposite side of the motor armature shaft mounted on and extending between the sides of the gear box, a third pinion having an extended sleeve rotatably mounted on the qsecond shaft, a large gear keyed to said hub extension of the third pinion-meshing with the second mentioned pinion, a rotatably mounted hoisting member carried by the frame-on the side of the web opposite the electric motor, and a gear secured to the end of the hoisting member within the gear box said gear being inmesh with the third pinion, substantially as described.

4/111 an electric hoist, a frame comprising a verticah web and a gear box integrally cast therewith at one end of the web, said motor mounted at one side and fixed to the gear box comprising inner and outer sides spaced apart ,andconnected by an integral cross portion at their upper edges, the lower side of the gear box being open, an electric web, said motor having its armature shaft extending through the inner side of the gear inner side of the gear box and equipped box above the lower edge :thereof, a rotata- 'blymounted hoisting member located at the,

opposite side of the web said hoisting member 7 having one end passing through the with. a gear, a pinion on said end of the motor shaft, and reduction. gearing between said pinion and gear mounted on two-shafts carried by the gear box, one at each side of the motor shaft, and adapted to connect said armature shaft pinion with the rotary hoisting member gear, substantially as described,

boxineluding spaced apart sides and an integral bottom, complementary lugs cast on said clo-:ure member and the upper gear box,

and bolts passing through said lugs for detachably securing said under member tothe gear box, substantially as described.

(5. In an electric hoist, a vertical web and a gear box cast integral therewith at one end of the web, said gear box comprising spaced apart side: connected by an integral upper cross portion, the lower side of said gear box beingopen, an electric motor attached to the web at one side thereof having an armature shaft extending through the inner side of the gear box, two short shafts one located at each side of the armature shaft in substantially the same horizontal planev therwith, a rotatably mounted hoisting member carried by the frame on the side thereof opposite the'motor having one end extending into the gear box, a gear fastened to said end of the hoisting member, means for holding said shafts against rotary movement, and reduction gearing mounted on said shafts and interposed between the gear on said hoisting member and the pinion on the armature shaft for driving the hoisting.

member from the motor, substantially as described.

7. In an electric hoist, a frame comprlsm a hollow gear 'box and a vertical web pinion on said end of the motor shaft, a gear on said endof the hoisting member, two stationary shafts located one at each side of the motor shaft extending between the sides of the gear box, a second pinion loosely mounted on one shaft and inv engagement with the gear on the hoisting member, said 'pinion having an extended hub, a second gear fixed to said hub of substantially the saine diameter as the gear on the hoisting member, a third pinion loosely mounted on theother shaft, and in engagement with the second gear, said third pinion having-an extending hub, and agear keyed to said last mentioned hub and inengagement with the pinion on the motor shaft, substantially as described. I I

8.. In an electric hoist a frame comprising a hollow gear box and a vertical web extending to one sideiherefrom, said fixed to andlocatedat one side of the web, a rotatably mounted hoisting memberlocated at the opposite side of the web, two shafts. extending between and passing ar box hav ,mg an open under slde', an e ectric motorshort keyway', a

through the sides of the gear box, each of said shafts at one end being formed withva in extending upwardly from the lower e go of the gear box into said keyway, a pin assi ng through said end of the shaft outsice of the gear box, and gearing mounted on said shafts, on the motor shaft and on the hoisting member for driving the hoisting member from the motor at reduced speed, substantially as described. 9. In an electric hoist, an integrally cast frame including a gear box and a vertical web extending therefrom, with upper and lower oppositely extending reinforcin zontal bar fastened to and at the edge of the lower flange, a rod passing through said lower flange and bar, a pulley mounted at the outer end of the rod, an electric motor fixed at one side of the web above said pulley, a rotary hoisting member mounted at the opposite side of the web, gearing located within the gear box between the motor and hoisting member for driving the later by the former, a flexible cable bent over the pulley, and a lifting block including two grooved wheels located under the web, said flexible member passing under the grooved wheels and thence upwardlyv around the rotary hoisting member, substantially as described.

In testimony whereof I aflix my signature;

GEORGE EDWARD MOORE.

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