US1058497A - Electric hoist. - Google Patents

Description

H; s VALENTINE.

ELECTRIC HOIST.

APPLICATION FILED JULY 20, 1912.

Patented Apr. 8, 1913.

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ELECTRIC HOIST.

APPLICATION FILED JULY 20,1912.

1,058,497. Patented Apr. 8, 1913 4 SHEETSSHEET 2v FIG 2.

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ELECTRIC HOIST. APPLICATION FILED JUL Y 20, 1912.

Pafiented Apr..8, 1913.

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ELECTRIC HOIST.

AYPL-IOATION TILED JULY 20, 1912 -4 SHEETS-SHEET 4- any:

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VALENTINE, F READING, PENNSYLVANIA, ASSIGNOB READING CRANE & H0131 WORKS, ()F READIRG, PENNSYLVANIA.

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Application filed July 20, 1912. Serial Np. 710,54 8.

To aZZ whom 1' t may concern Be it known that l, HERBERT S. V LEN- rircn, citizen of the United States, residingat Reading, in the county of Berks and- State of Pennsylvania, have invented certain new and useful Improvements in Electric Hoists, of Which the following is a specification.

My invention particularly relates to hoist,- mechanism for cranes or the like, and is especially directed to electrically propelled hoists. i

The principal object of ,my invention is to provide an electric hoist composed of tHJPtlltttQ, independently removable units respectively, comprising the driving mecha- 1; or motor, the controlling mechanism its resistance, the reducing gear mecha- "l, the holding brake mechanism, the lowcrmg brake mechanism, and the stop mechanism. all assembled to form a compact, comunitary structure. .ier objects of my invention are to proan electric hoist having the parts so -lated as to afi'ord a minimum head ace or approaching distance between the ,porting hook and load carrying hook, and to dispose said hooks in alinement with the center of gravity of the assembled com .site structure, whereby it is maintained in acsolutc equipoise, irrespective of the load carried thereby.

Further obyects of my invention are to provide separated synchronously actuated winding drums to W iich the opposite ends of the lifting cable are coiled, whereby an twisting tendency of said cable is prevents and to provide Winding drums of such diameter that their cylindrical cable sug- -porting surfaces are substantially in t e cylindrical plane of the itchline of the drum driving gear, Where y the cable may depend in aplane tangent to the itch lines of the intermeshecl teeth. of said rum driving gear and the gear connecting it with the driving mechanism, thereby substantially reducing the friction in the bearings.

This invention also comprehends novel means for suspending the hoist casing from the supporting hook; and includes a guide for preventing the cable from climbing.

This invention further includes all of the various novel features of construction and arrangement "of the parts as -hereinafter more specifically set forth.

Specification of Letters Patent.

shown in opposite ends. 1' Said drums have the res Patented Apr. 8, 1913.

In the acco'mgganying drawings, Figure 1 is an end eleva 1on of'an electric hoist constructed in accordance with my invention; Fig. 2 is a rear eleyation of the structure F as viewed from the left of said figure; Fig. 3 isv a sectional plan view of electric hoist, taken in the plane-of the axis of the Winding dru ms, certain parts being shoyvn'. in elevat on for convenience of -illus tra t on; Fig. 4 is a transverse, vertical, sectional yiew of the gear casing and the included. mechanism, taken on the line 44 in F g. 5 Fig. 5 1s a longitudinal sectional view of the hoist, taken on. the line 5-5 in Figs. 1 and t; and Fig. 6 is' a fragmentary sectional View, showing the automatic stopp ng mechanism.

In said figures the supporting book .8 is conveniently connected to su ort the hoist by the sus ension plates 9 an 10 which are o n d by 1 3 and- 14; on the gear casing 15, which has the narrow extens on 16, rovided with the removable cover 17" and t e bearing bosses 18, which extend through, and are snugly fitted in suitable apertures said suspe sion plates 9 and 10.

he bearing bosses 18 are rovid ed with bearing sleeves 2 0, in whi' lie drum shaft 21 is ournaled, and rotatably carries the winding drums 22 and 23 at its ,refsipectively I I I anges 24 at their opposed edges, extendin ferentially from their cylindrical'gaces, and providing means to prevent accidental ,di scircumplacement of thelrope or cable 25, vvhoseopposite ends are helically wound around ective drums as best shown in '3, and .wiose intermediate ortion forms jthe bi ht QGeXtending loose y'throu h a suitb ie channel in .the b'lock 27 .of t ev liftingIj' hook WhlCh lS pivotally connected :6 the lugs 29depending from said block. 1

The drumshaft 21 is provided with the drum gear 30'disposed Within the extension with the pinion 31 which is mounted for rotation on the shal' tBEZcarried, by the sup? porting lugs 33 and 34 in said casing, as best shown" in Fig. 3, and which is connected- With the'train of reducinggears, andflas best shown in Fig. 4 is in toothed'engagement with the gear 35, which, as best shown in Fig. 5, isrotatably mounted on the shaft 36, conveniently supported at one end in the I 16 of the :casin' 1'15, in toothed-engagement hanger 37 and at the other end by the removable hearing plate or. partition 38, to which it is secured in stationary relation by the nut 39.

The hub 40 of the gear 35 is conveniently provided with b aring sleeves 41 and is extended to carry the gear 42- which rotates therewith in toothed engagement with the )inion 43 on the shaft 44 of the lowering rake mechanism 45, which shaft 44 is journaled in the bearing 46 in the plate 38. which separates the reducing gear chamber from the lowering brake chamber, and in the bracket bearing 47 in the latter chamber.

It may be here noted that the lowering brake mechanism herein employed is of a well known construction, and will, therefore, not be described in detail, but however includes the gear 48 which is operative to rotate the shat't 14, being in toothed engagement with the pinion 49 on the shaft 50 of the gear 51, which is driven by its toothed engagement, with the pinion 52 on the shaft 53 ot' themotor 54.

The motor 54 comprises the field coils 55, armature- 56, and commutator 57 111- closed in a suitable casing 58, the bulk ofv which extends within the gear casing 15, and conveniently forms a closure therefor, having a flange 61 by which it is removably bolted to the end of'said gear casing 15. Said motor casingxincludes a separable end cap 62, having apertures 63 for affording access to the commutator 57 and the parts cooperative therewith. The motor shaft 58 is journaled at its inner end .in the bearing 65 having the oil cup 66, which is automatically supplied with oil carried up by the ears and dripped from the teat (38 on the ianger 37, and is journaled at its outer end in the bearing 69 having the oil cup 70, and carries the brake drum 71 coiiperative with the electric brake mechanism to be hereinaftfer described.

As before stated, the plate or partition 68 separates the gear chamber from the lowering brake chamber, which is provided with the closure 72 having a flange 73 removably bolted'to the end of the gear casing 15, and having the detachable cap 74 bolted thereto, as bestshown in Fig. 5, for utl'ordiug con venient access to the lowering bra ltc mechanism. p

The electric brake mechanism above rct crred to, which automatically locks the hoisting mechanism and holds the load suspended when the power is shut oil. comprises the HtPlll'tll'llQ bracket 75 detachably supported by the motor casing 58 and forming the casing 70 for the coils 77 ot' the solenoid having the plunger 79, which \is connected by the bolt 80 with the ('rosS-llotpd 81, .to which the inner ends ol the levers t; are pivotally engaged; Said levers SJand 83, as best. shown in Fig. l, tt-l t,/lll\(l ltllly supported at St and 85, intermediate of their length upon the lugs 80 and 87, extended upwardly from the solenoid casing, and said levers are pivotally connected at their outer ends with the brake shoe levers and 91, which a e pivotally supported at 9'2 and 93 for rela ivc oscillation to the upwardly. extending lug 95 on the casing 76 of the solenoid. uid brake shoe levels 90 and 01 respectively have the substantially semi-circular flanged recesses forming shoes 90 and 97 provided with facings 9S and 99 ot leather, fiber or other suitable material, embracing the brake drum T1, and normally forced into engagement therewith by the springs 100 and 101, which aremounted on the bolt 102 loosely extended through the bosses 103 and 104 on the respective brake shoe levers 90 and 91, said springs being normally under compression between said bosses 103 and 10l and the respective washers 106 and 107, and being adjustable by the nuts 108 and 109.

It will be obvious from the foregoing description that by connecting the solenoid and driving, motor in series, any electric current supplied to rotate the motor will contem oraneously actuate the solenoid to effect t e release of the brake shoes 90 and 97 from the brake drum 71 and permit the free rotation'of the motor and the untrainmeled actuation of the md-hanism counccted therewith 7 As best shown in Fig. 1. the motor and Solenoid are electrically connected through the conduit 110 iuclosing wires 111 and 112, with thecontrolling mechanism 114. and resistance 115 which, being of well known construction, is deemed unnecessary to herein set forth the structure in detail, other than to invite attention to the fact that it forms one of the separable units of the hoist structure.

It. is highly essential that the throw or trai'el of the load hool-s be limited. which may be conveniently etlccted by providing means actuated by the rotaticu ol the winding'drums and connected to cut. oil the power; such mechanism is best shown in.

Fig. 0 and comprises a bracket 110. carried .by the drum )3, and provided with the threaded bearing 117. having the stop shoulder 118. in which the screw 119 is ii'iouutcd to be rotated by the miter gear 190. which is keyed to rotate said screw 119 but capable of permitting a relative axial movement of said screw therein. Said miter gear 120 is in toothed engagement with the miter gear 122, which is mounted for rotati n on the stud shaft 1221 projecting from the bearlug, 117 in coaxial relation with the drum 23, and carries the band wheel or pulley 124, which is connected by the crossed bands or cords 125, as best shown in Fig. 1, with the hand wheel or pulley 126 on the shaft 127 llO of the controller or rl eostat 114, it being noted that said cords may be conveniently attached to said pulleys 124 and 126 to in sure their positive synchronous rotation. Said screw 119 carries theadjustable collars 130 andlSl respectively, having shoulders 132 and 133, the shoulder 133 being arranged to engage. the shoulder 118 on the bearing 11? to limit the upward movement 01'' said screwtrom the position shown in Fig. (l, and the shoulder 132 being operative to ei'igage the shoulder 135 of the bearing 136 to limit the downward movenurnt of said screw from the position shown in said figure. The controller shatt 127 also carries the manually actuated band wheel or pulley 138,

having the cords 13S) and 1-10 secured thereto in any suitable manner and depending tangentially from its diametrically opposite sides, through eyes 141 and 112 in the guide 14-3 and provided with handles 144; and 115 respectively, by which the controller shaft- 127 may be actuated.

The controller shaft 127 is normally maintained inits inoperative position by the spring 146, which encircles said shaft and has its opposite ends extended laterally upon opposite sides of the pin 147 projecting from the pulley 138, and the pin 141% projecting from the casing of the controller 114.

It will be obvious from the foregoing description that when one or other of the hand grips 139 or 140 is pulled by the operator, the shaft 127 will be rotatedeorrespondingly to throw on power which eftects the rotation of the drums 22 and 2 and that such rotation of the drum 22-1 carries the miter gear 120 in a cylindrical path about the axis of rotation of said drum, in toothed engagement with the miter gear 122, which being held stationary causes the gear 120 to rotate the screw shaft 11%) until one of the stop collars on said screw contacts with one of the shoulders 132 or 133, which prevents further relative rotation of the screw 119, thereby locking the. gears in relatively fixed relation, so that the further rotation of the winding drums etl'ects a similar rotation of the gear 122 and the controlling mechanism connected therewith, to return the shatt 127 to its neutral or inoperative position.

As shown in Figs. 1 and 23, the plates 9 and 11) respectively carry rope guides 111) and 150, extending outwardly in such relation to the winding drums 22 and 2 3 so as to prevent the rope or cable 2.1 from climbing or overlapping, and said guides are each provided with a lateral llange 151 tor preventing the rope or cable from slipping over the edge 0'! the drums.

As best; shown in Figs. 1 and 2, the gear casing 15 is provided with the oil gage 152 having the indicator 1533 to indicate the level of oil in said casing, in which the gears are partly submerged, and which may be poured there through the inlet 154.

It is not desired to limit, this invention to the precise details of construction and arrangement herein set forth, as various modifications may be made therein without departing from the essential features of the invention, as defined in the appended claims.

Having thus described my invention, I claim:

1. An electric hoist comprising independently removable'units including the reducing gearing,.a casing for. said gearing, lowering brakemechanism, a. partition in said casing separating the gearing from said mechanism and providing bearings therefor, a removable closure for said casing, embracing said mechanism, a motor, it using for said motor forming a closure for the goal" casing and extending therein and removable therefrom, electric brake mechanism detachably carried by said motor casing and connected to actuate synchronously withsaid motor to release, and a controller detachably supported by said gear casing, all assembled in indcpemlently detachable relation to form a compact composite unitary structure.

2. An electric hoist comprising a gear casing having a lateral extension, reducing gears in said casing, lowering brahe mechanism in said casing, a motor, a casing tor said motor supported by and extending into said casing, a drum driving gear rotatably mounted in hearings in said lateral extension. a shalt for said gear extending oppositely from said extension, winding drums mounted on said shat't upon opposite sides of said lateral extension, a hoisting cable having its opposite ends hclically wound around the respective drums, aml its inter mediate bight depending in a plane of the center 01 gravity 01 the hoist structure thus 'l'ormcd. and means suspended by said cable 'l'or engaging the load to be hoisted.

51. An electric hoist comprising reducing gearing, a motor l'or actuating said reducing gearing, separated coaxially mounted winding drums. a drum driving gear disposed bctween said drums, in toothed en gagcmcnt with one of the gears of said rcduring gearing, a hoisting cable having its opposite ends attached to aml helieally wound around the respective drums, and having its intermediate bight depending in a plane tangential to the cylindrical surface of said drums aml the pitch circuml'crence of said drum driving gear, and guides for holding said cable against the surl'ace of said drums.

4. An electric hoist comprising a gear casing, reducing gears in the casing, lowering brake mechanism, a motor, a casing for the motor supported by and extending into the gear casing,ia rotatably mounted drum drivmg gear, a shaft -for said gear, winding drums mounted on said shaft, a hoisting cable having its opposite ends helically Wound around the respective drums, and its intermediate bight depending in a plane of the center of gravity of the hoist struc'-' casin for the motor forming a closure for t lie gear casing and extending therein and removable therefrom, electric brake mechanism detachably earried'by said 1111 tor casing and connected to" actuate synchronously with the motor to release, and a controller detachably supported by said gear casing, all assembled in independently (letachable relation. ,7

In testimony whereof I afiix my signature in presence of two witnesses.

HERBERT S. VALENTINE. \Yitnesses MARY E. S OFFER, ED. A. ICELLL'.

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