US1112153A - Hoisting mechanism. - Google Patents

Description

E. Y. MOORE. HOISTING MECHANISM. APPLICATION rum) DEC. 2a, 1913 Patenugi Sept. 29. 1914.

' SHLIUN SHEET 1.

E. Y. MOORE. HOISTING MECHANISM. APPLICATION runnnno. 29, 1913,

2 SHBETS- SHBET 2.

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Patented Sept. 29, 19145.

acteristics aresunnnariaed in the claims.

dinary chain 20.

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ljlhll an s rarns PATENT OFFICE.

HOISTING MECHANISM.

nitrates. sp ifi a of Letters rmnt- Patented Sept. 29, 1914.. Application filed December as, 1913. Serial No. 809,309.

1 and 2) the two sprocketwheels are rotated together and act after the -mannerof the well-known differential pulley. I

Rigid with the sprocket. wheel 16 is a as second set of clutcn teetlr'ZZ-K, these teeth being shown as carried'on a disk 2 L surrounding the hub of the'spr'ocket wheel 16 and rigidly bolted to it through spacing sleeves 26. The teeth 23 are adapted to cooperate mg with teeth 27 projecting from the face of the disk 28 which is formed on or secured to the frame standard 11.

From the construction described, it follows that, if the sprocket wheel 16 is shifted toward the left from its position in Figs. 1 and 2, it becomes locked against rotation. This anchors the chain which surrounds that pulley, so that a rotation of the pulley makes a. direct pull on the chain, thus n driving; it at a much more rapid speed than the diiierential drive.

The chain is endless. Starting the de scription of its course with the pulley 16, the chain passes oil of the front edge of this so pulley by the reach 30 over the lifting sheave 31, thence via the reach 32 to the rear edge of the pulley 15; from the front, edge of this pulley a reach chain 33 extends around the idle pulley 34:, from whence the n reach 35 leads to the rear edge of-the pulley 1G. The lifting pulley is connected in a suitable manner-with the loadffor example, by the chain shown as leading'froin the hook 1-1 of the pulley 31 over one or more a idlers 4 2 to the load 4.3. Thejdle pulley 34: is suitably supported, and I find a convenient way to do this is to connect it by a cable with the hook 4:1, this cable extending over the idler 4:6. .3

\Vith the construction described, if the main shaft 13 is rotated by suitable mechanism, the chain extending around the lifting pulley 31 is pulled downwardly to raise the load or fed upwardly to lower the load, and such descent or rising of the load pulley 31 gives a complementary movement to the idle pulley 3% to take up the slack in the chain. For direct driving, the pulley 16 is held stationary by shifting it so that it clutches with the stationary" teeth 27. This looks the chain reach 30 and then, if the rotation of the main shaft is in adirection to'pull down on the reach 32, the load is aised rapidly. If the direction of rota- 119 tion of the shaft is opposite, the' load is lowered rapidly. If, on the other hand,

To all whom it may concern:

Be it known that l, Enwann Y. Moons, a citizen of the United Eitates, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful improvement in Hoisting Mechanism, of which the following 13 a full, clear, and exact description, reference being had to the accompanying drawings.

The object of this invention is to provide an etlicient hoisting mechanism adapted atwill to raise or lower its load slowly and gradually or comparatively rapidly. To this end I have provided two adjacent sprocket wheels having, respectively a different number of teeth or pockets, mechanism for slowly rotating one of the sprocket wheels, andineans for clutching the other sprocket wheel to its neighbor or to the stationary support, whereby a hoisting chain may be fed ditierentially or may be an chored and given a direct pull.

My invention is hereinafter niiore fully described in connection with an approve embodiment thereof and the essential char- In the drawings, Figure l is a side elevation of my hoisting mechanism; Fig. 2 is a vertical section along the main shaft; Fig. 3 is an end view looking from the right hand end of Fig. 1; Fig. d is a vertical section through the driving mechanism on the line l t of Fin. 2 looking toward the left; Fig. .3 is a vertical section onthe line of Fig". 2 looking toward the right; Fig. 6 is a detail illustrating the braking device.

in the drawings, 10 indicates a suitable form having; standards ll and 12 in which is iournaled a shaft. l3. Keyed on this shaft a sprocket wheel 15. Slidably mounted on the shaft is an adjacent sprocket wheel U). The sprocket wheels 15 and 16 have respectivelv different nuinliers of teeth. For instant-e one of them may have eighteen teeth and theothcr nineteen. for theparticular nuinhcr immaterial. The sprocket teeth may he of any desired form, according to the chain with whit they are to coiiperate. As shown, they are o' the usual pocket con struction and are adapted to receive an or- The two sprocket wheels 15 and 16 are prm'ided on their adjacent sides with clutch teeth iZl'and 22, which are designed to court to lock the two sprockets together, when desired. JJlien so locked (as shown inFigs.

slow movement in one direction or one other the Dullc Y 16 is clutched with. the nulls" in 69 secured. thereto. almond the ilatc x a a 1 l F s v i.

tile diiierential action slackens on the reach oh each oi these shafts i2 carries two ccwl'iene'rer the reach 32 is pulled, and, ac-' centrics 7i and 75. 'lhcsc two pairs oi cc Yokes To and T? which have internal gear teeth 7e meshing:

l l l cordingly, the load pulley 2'31 12; given a, very I centric-s are mounted in two for the same rotation of the main slut with the teeth of a spur gear rigid on H which gives a rapid movement with (the the shaft 13 The result of the above condirect action. The actual direction which struction is that, as the motor drives the the rotation of the shaft gives to the lifting shaft Hi, this. through. the gear and (the s pulley 31 under these circumstances do eccentrics, gyrates ihc two yokes (one hal-- pends on which sprocket 15 or l'o' has the ancing the other), whicl I gives a very slow arger number of teeth. As shown in the rotatim'i to the spur gear and thus to the rawings, the sprocket .15 has the larger shaft 1 1o drive the-hoisting pulleys.

number of teeth, so that a right hand rota Keyed on the shaft (i-l is a bushing on tion of the main shaft pulls on the reach 32 the squared portion of which are mounted s farthenthan it slackens on the reach 30, friciion risks 31 pressed toward a disk tins raising the load, Accordingly, as which is loose on the bushing. This disk shown, the right hand rotation rah s the has a cvlindrical 'la nge carrying rigid load whether the mechanism is diil'crcntial teeth with which coacts a pawl Sic lrhen 29 or direct, or, if desired, one of these more i the shaft is turned in the dirccti on to raise ments could he the reverse of the other by the load, the friction disks and the disk 82 simply carrying the larger number of are rigid with the shaft in the direction sprocket teeth on the other sprocket. allowed by the pawl 84, the pawl clicking i ny convenient means may he employed idly over the teeth. iVhen the rotation 25 for shifting the movable sprocket and hold-- sto'is, however, the pawl )rc\'e1ii"s backward. 90 ing it in either extreme position. I hare I rotation of the disk 82, and this allows found. it very satisfactory to employ a shittbackward rotation of the shaft only by the able bar 50 slidahly guided on the hase l0 slipping of the friction disks. The fricand having a pair of rollers 51 and lying tion disks are pressed together on this so on opposite sides of the disk 24; and for backward rotation by means of the teeth of r shifting this bar I provide an eccentric 5 1- the clutch ineinl-ier (ll cannning the wheel 63 lying between the lugs 55 of the liar. fho 1 toward Elie brake. eccentric is mounted on a shaft 56 journaled I shown, the brake comprises a, series of in the frame and connected, rigidly with an I disks 81 alternately loose on the bushing and operating rock lever 5'7. This lever preferconnected. with it, the loose disks having ably extends normally in approximately I projecting portions 85 extending into suithorizontal position in which its own weight I ahle pocki-ts in the hinge of the disk 82, may hold it, wherefore, to change the opand such is the form illustrated, though it eration from difiercntial to direct, and. vice to he understood that any number of disks are versa, it is only necessary to throw the lever may he used. as her ssary. The fricilion over to the opposite position, which this inecllanis provides may" be Any suitable mechanism may be our suiiicicnt to make the hoisting device sellployed for rotating the shaft 13. I have locking, if desired, and is particularly shown a satisfactory oevice for this purpose valuable when the incchai'iism is directly ,gg adapted to be driven by an electric motor driven with the sprocketwheel 10 held slaand give the desired slow rotation to the tionary.

shaft 13. ll rat mechanism will now be de- The above described gyratory driving ib d, i'i'icchanisni and'friction brake are claimed 60, in Fig. 1, indicates an electric motor, in my prior l a'lentsi os. 757,333 and 946,253, so the armature shaft of which carries a pin- I to which reference is made for fuller dc- L ion (32. lh'is pinion meshes with a spur srription. In the present mechanism, when gear 63 on ashaft 34., but constantly clutched i the sprocket wheel 16 is locked to its neightherewith by means of a. clutch member 51 her, the diil erential pulley itself makes a rigid with the shaft. This shaft is alined self-lockii'ig hoist, so tiat a brake rnccha- 55 with the shift 13 and shown as su; ported iiism is unnecessary. Accordinglyflprovide 5 in l ran'ic iudards 65 and 56. The latter. for throwing out the pawl 84 when the two is preferably of disk-like form and sprocket wheels are clutched together. This enacts with the frame member 12 to form a is :wcoinplislicdsimply by extending the slide suitable casing about some of the mecha-- i 50 and providing it with a cam shoulder 87 as p whirh coacts with the tail 88 of the pawl to n the shalt or 18 a pinion '70 Silli'L n to idle position when the slide is l es with a pair of spur rears Tl aimed in that direction.

1 thereof. Therm gears are llaiiug thus described my invention, what iwhich ariournalcd in claim is: !2l{'i ll; and in i, bordilce casl. The combination of twosprockct \vhecls ping lieving the brake when the loose sprocket is having respectively: different numbers of teeth, a chain formed in a loop and wraparound both sprocket wheels,,means for lockin one of the wheels to the other or to an independent device, a brakeadapted to retard the rotation of the other wheel, and

means for automatically rendering the brake inactive when the sprocket wheels are locked toeach other and active when one of them is locked to the independent device.

2. in .a hoisting mechanism, the combination of two adjacent sprocket wheels having respectively different numbers of teeth, a chain formed in a loo and wrapping around both sprocket W eels, means for clutching one of the sprocket-wheels to its neighbor or toa stationary evice, as desired, a brake'adapted to retard the rotation of the other wheel, and means for concurrentlp applying the brake and causing said clutc ing to the stationary device.

3. The combination of a shaft, a pair of adjacent sprocketwheels thereon, one tight on the shaft and one loose on the shaft, a stationary device on that side of the loose sprocket, which is opposite to the tight sprocket, means for shifting the loose sprocket alternatively into engagement with the tight sprocket or the stationary device, a brake adapted to retard the rotation of the shaft and means for automatically relocked to the tight sprocket.

l. In a hoisting mechanism, the combina tion of a shaft, a pair of sprocket wheels thereon having respectively different numbers of teeth, one of said sprocket Wheels being fast on the shaft and the other loose, a chain formed in a 100 and Wrapping around both sprocket w eels, means for shifting one of said sprocket wheels to clutch it with its neighbor or with a stationary device, a brake on said shaft adapted to act in one direction of rotation thereof, and mechanism for throwing said brake out of acticm concurrently with the shifting of the movable pulley.

The combination of a shaft, a pair of sprocket wheels having respectivelydifferent numbers of teeth, one rigid on the shaft and the other loose on the shaft and shiftable, means for clutching the shiftable wheel with its neighbor'in one position and with a stationary device in the other position, an eccentric shaft, means engaging said shaft for shifting said pulley, a brake on said first mentioned shaft adapted to act when rotated in one direction, and mechanism for throwing said brake out of action by the means for shifting the movable pulley.

6. The combination of two independent sprocket wheels having respectively different numbers of teeth, means for driving one of-said wheels, a chain looping around both sprocket wheels, a brake comprising a ratchet wheel frictionally connected with the driving device to rotate with-it and a pawl. adapted to: engage the ratchet wheel and prevent backward rotation of it means for relieving the friction of the brake to allow backward turnin of the driven wheel independently of the ratchet, and shiftable mechanism adapted to connect the loose j sprocketwheel with the driving device and withdraw the pawl from coaction with the ratchet wheel.

7. In a hoistin mechanism, the combination of two in ependent sprocket wheels having different numbers of teeth, a stationary device, means for clutching one of said sprocket wheels alternatively to the other sprocket wheel or to said stationary device, a chain wrapping around both sprocket wheels having two upwardly extending loops, a load pulley in one of said loops, a loose pulley in the other loop, and a flexible connection extending over a sheave and having each end attached to one of said pulleys. y

In testimon whereof, I hereunto affix my signature in t e presence of two witnesses.

' EDWARD YOUNG MOORE.

Nitnessesi O'rro SHIMA, JoHN R. Means.

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