US1833648A - Hoist - Google Patents

Description

Nov. 24, 1931. J. P. VJOHNSON HOIST Filed April 9, 1928 2 Sheets-Sheet l NOV.l 24, 1931. J, p, JOHNSQN 1,833,648

HOIST Filed April 9, 1928 l 2 Sheets-Shea 2 Patented Nov. 24, 1931 UVNIITED `STATES PATENT OFFICE JAMES P. JOHNSON, vOF CLEVELAND, OHIO, ASSIGNOR. TO THE J'. P. JOHNSON ENGINEER- ING CO., F CLEVELAND, OHIO, v.A CORPORATION' OF OHIO HOIST Application led Apri1'9, 1928. Serial No. 268,606. i

.This invent-ion relates to a hoist and has f particular utility in connection with the hand-operated type of chain hoist, although clearly susceptible of advantageous embodiment in other types of hoists.

In hoists as heretofore constructed, those that are eiieient in operation are very expensive while those that are inexpensive are also inefficient in operation. Therefore, the principal object of the invention is to provide a hoist which may be manufactured and sold inexpensively and which, at the same time, will be highly efficient inl operation.

Another object is to provide a hoist which has a high capacity rating in relation toits slze.

A still further object is to provide a hoist wherein the casing or housing is so constructed that the load chain will not climb olf the sprocket upon which it is arranged or follow the same around under light loads.

Further additional objects are to provide a high speed hoist, one which may be readily assembled' or disassembled, and'one capable of thorough lubrication; while during the following detailed description of the invention there will be seen to be still further objects and advantages arising therefrom which have not been specifically mentioned above.

A preferred embodiment which the invention may take vis illustrated in the accompanying drawings wherein:

Fig. 1 is an approximate longitudinal verticalsection through the hoist, the shaft being shown in side elevation;

Fig. 2 is a transverse section taken approximately on the line 2-2 of Fig. 1 looking in the direction of the arrows;

Fig. 3 is another transverse s'ectional view of the hoist on the line 3 3 of Fig. 1; and

Fig. 4 is an end elevation of the hoist looking from the right of Fig. 1 with the actuating mechanism omitted and the shaft shown in section.

The operating parts of the hoist are housed in a casing or housing, indicated generally by the numeral 1 in Fig. 1, which comprises a cylindrical portion 2 closed at the end 3 andv open at the opposite end. The closed end 3 is provided with an enlarged central hub 4, while the open end has an outstanding annular flange 5 provided with a number of equally spaced tapped openings. An annular flange 6 extends inwardly of the casing at approximately the lmiddle of the portion 2, such flange being for the purpose of supporting and centering certain of the working parts of the hoist and providing a bearing therefor. The exterior of the casingl may be suitably provided with reinforcing ribs 7, while a boss or lug 8 extending centrally from the upper side of the casing forms a convenient means for lsecuring the hoist to a suitable support. The portion 2 of the casing is also provided with two separated openings 9 and l() through which the hoisting or load chain passes, the end which goes through the opening 10 being secured to a lug 11 extending from the side of the casing while the end extending through the opening 9 is attached to the load. Thus the construction of the casing is such that it completely encloses the load wheel or'sprocket.

It has been found that under extreme loads the load chain will lengthen and will have a tendency to climb over thetop of the sprocket, but since the casing encloses the wheel and is spaced therefrom just enough to permit the chain to move normally around the wheel, this climbing cannot occur. Also. because of the fact that the two openings 9 and' 1() are separated, the chain is prevented froml following around with the sprocket under light loads after it has been stretched from previous heavy loads.

vA'power shaft or member 12 is arran ed longitudinally of the casing, being rotataly supported at one end by a casing cover 13 and intermediate its ends within a member later 4to be described. Of course the forward end of the shaft extends outwardly beyond the end of the casing and is adapted to receive the hoist actuating mechanism. The shaft is provided adjacent to the casing cover 13 with two oppositely disposed eccentrics or cams 14 and 15, each of which preferably has flanges along its circumferential edges providing races for bearing rollers 16. A rotatable load member 17 is also ar- \fo\rwardly therefrom.

ranged in the casing and has an enlarged cup-shaped portion 18 bearing against the flange 6 and the portion 2 to/ the rear of said flange and a sprocket portion 20 extending The portion 18 has an internal gear 19 adjacent itsrear open end while the sprocket 20 is formed to receive the load chain. As clearly shown in Fig. 1 the sprocket portion 20 is in the nature of a vhub rotatably fitting over the hub 21 of a stationary roller flange 22 arranged within the cup-shaped portion 18 adjacent to the base thereof. The bore of the hub 20 is provided with a'bushing 23, while the hub 21 of the roller flange 22 is rigidly fixed, as indicated at 24, within a central opening of the hub 4 of the casing, such hub 21 having an internal bushing 25 forming a bearing for.\the shaft 12. Rollers 26 are interposed vbetween the roller flange 22 and the shaft 12, such rollers also extending within an enlarged part of` the hub 21.

Theflange 22 has a plurality of equally spaced'holes 27, in the present instance eight in number, for receiving the ends of a corresponding number of rollers or pins 28 of lsuch a diameter that a desired amount of clearance is provided between the openings and the rollers, as clearly shown in Fig. 3. The casing cover 13 has an enlarged annular central portion and a projecting rim 29 provided with openings fo-r the passage of securing members 30 which thread into the tappedopenings in the flange 5 of the casing and secure the cover thereto. A central opening is arranged within the enlarged portion of the cover and is provided with a bushing 31 to receive the rear end of the power shaft 12 andthe bearing rollers 32 interposed therev between. A number of holes 33 are arranged in the cover 13, which holes correspond in size and number to the holes 27 in the stationary roller flange and are in longitudinal alignment therewith.`

It will thus be seen that the rollers or pins 28 are supported at their opposite ends in the holes 27 and 33 and are held substantially in fixed position except for the ro-lling movement they may have because of the clearance created by the differencesI in diameter between the rollers and the holes. A cap plate 34 is suitably secured upon the outer side of the casing cover 13 and maintains the rollers 28 and the bearing rollers 32 in position within, the casing. Upon the rollers 16 carried by the eccentricsy or cams 14 and 15 are two similar drive gears 35 and 36, each of such /gears being provided with a number of equally spaced circumferentially arranged openings 37 corresponding` in size to the holes in the roller flange andl casing cover but only half as many in number', and also with a like number of larger openings 38 arranged intermediate the smaller ones. The smaller openings 37 may be said to con- 1,8ss,c4s i small opening in the other gear for a purpose lated to be described. rlhe number of teeth on the gears 35 and 36 are selected to have a predetermined relationship to the number of teeth onthe internal gear 19 and are, in the present instance, 40 in number, as compared to 42 upon the internal gear.

The end of the power shaft ormember 12 which extends outwardly beyond the hub 4 is provided with a 'keyway 39 so that the hoist actuating mechanism may be keyed thereto. This mechanism is substantially conventional in form and will only be described briefly herein.V It consists of an externally threaded hub 40 having an enlarged flange 40a at its rear end engaging an enlargement on the shaft and held against endwise longitudinal movement on the shaft by nut 41 and washer 42. A sprocket wheel 43 uponwhich the actuating chain travels has an enlarged hub portion 44 internally threaded so -as to travel upon the external threads of the hub 40. The forward face of the flange 40a, of the hub 40 and the rear face of the arms of the sprocket wheel 43 are provided with friction material, while arranged intermediate the same isa floating ratchet member 46`adapted to be operatively associ'ated with a pawl, indicated generally at 45, whichy is pivoted upon a pin extending from the end of the casing.

It will be apparent that when the sprocket.-

43-is rotated in one direction it will ride toward the easing because of its threaded engagement with the'hu'b 40 and will engage the friction faces previously mentioned, thus clutching the sprocket and the hub for movement together and, in turn, causing rotation of the shaft 12. The pawl 45 engaging in the teeth of the ratchet will prevent reverse movement until the sprocket 43 is moved by the reverse actuation of the actuating chain.,

The hoist or'load chain is indicated in Fig. 1 by the numeral 47, while the numeral 48 identifies a nipple through which lubricant is forced into the casing. It should be understood that suitable bearings'could be provided for any portion of the operating parts which are not at present provided therewith and also that the number of openings and drive rollers used within the hoist could be changed without departing from the invention.

by the. cams 14 and 15 and a ortion of they teeth thereon will mesh With t e teeth of the internal gear 19. Since the cams are oppositely dis osed, the teeth of the gearwill mesh witg the internal gear at directly o positc points to thoseat which the teeth o the gear 36 are in mesh therewith. The holes 27 and 33 in the roller flange and casing cover, respectively, having a diameter greater than that ofthe rollers or pins 28, provide a'clearance for the latter which allows thc rollers to have a rolling movement around v the vcircumference of such holes.

Although a plurality of bears are shown herein, it should be understood that the number of gears employed is optional; however, the 'use of two or more gears being preferable because of the greater number of the teeth thereof in constant mesh with the internal gear. the clearance holes in the gear would be nnneeessary as there would only be one set of drive rollers or pins; and in this connection. it might be well to point out, that in the embodiment herein disclosed there are really two sets of drive pins or rollers, namely, one Jfor the gear 35 and another for the gear 36. Of course, it is not necessary to have the `pins or rollers supported at both ends although preferable for obtaining a smoother and more uniform operation.

A preferred embodiment of the invention has been shown with the 'understanding that the invention is not to ybe limited thereto but may follow such modifications and adaptations as fall within the scope ofthe appended claims.

Haring thus described my invention, I claim:

1. In a hoist. a rotatable power member and a rotatable load member, one of which is provided with an eccentric portion, a support for said members. and a driving connection therebetween, said connection comprising an internal gear, an external gear, one of said gears being arranged upon said eccentric portion of one of said members and adapted to mesh with the other of said gears, and antifriction means engaging said eccentrically arranged gear and said support to prevent rotation of the gear with respect to the supportv but to permit eccentric movement thereof.

2. In a hoist, a rotatable power member and a rotatable loadl member, one of which is provided with an eccentric portion, la driving connection between said members, and a support therefor, said driving connection comprising an internal gear, an external gear, one of which is arranged upon the eccentric portion of one of said members and the other of which is concentric to the other of said mem- In a hoist employing only one gear, .v

bers, a fixed member secured to said support arranged concentrically with said concentric gear, andmeans carried by said support and Y fixed member and passing through said eccentrically arranged gear to prevent rotation of the' gear with respect to the support but to permiteccentric movement thereof.

3. In a hoist, a rotatable power member, a'rotatable loadmember, a support therefor, having a plurality'ofl equally spaced holesA and a driving connection therebetween, said connection con'iprising'a gear mounted to be .moved eccentrically by one of said members and providedwith a plurality of holes arranged similar to the holes in the support, a gear associated with the other of said members and adapted to mesh with said first named gear, and anti-friction means each engaging the hole 'in said support and said first named gear to prevent rotation of the latter but to permit eccentric movement thereof.

4. In a hoist, a rotatable power member, a rotatable load member, a support therefor' having a plurality of equally spaced holes, anda drivingconnection therebetween, said connection comprising a gear mounted to be moved eccentrically by one of said members and provided with a plurality of holes of a size and arrangement corresponding to the holes in the support, a gear associated with the other of said members and `adapted to mesh with said first named gear, and antifriction rollers of less'diameter than said holes each engaging a hole in said support and said first named gear to prevent rotation of the latter but to permit eccentric movement thereof.

5. In a hoist, a rotatable power member, a rotatable load member, one of said members having an eccentric portion, a sup ort for said members having a plurality o equally spaced holes, and a driving connection between said members comprising a gear arranged upon the eccentric portion of one of said members and having a pluralityof holes corresponding in size and arrangement to the holes in said support, a gear associated with the other of said members and adapted to mesh with said first named gear, and antifriction rollers of less diameter vthan said holes each engaging a hole in said support and said first named gear to prevent rotation of the) latter but to permit eccentric movement thereof.

6. In a hoist, a rotatable power member, a rotatable load member, al support for said member provided with a plurality ,of equally circumferentially spaced holes arranged in longitudinally aligned pairs, and a driving connection between said memberscomprising aninternal gearassociated with said load member, a plurality of external gears associated with said power member and mounted to be moved eccentrically thereby inl mesh with said internal gear, said external gears each having a plurality of holes spaced correspondingly to the holes in the support, certain of the holes in the gears belngof the same size as the holes iu the support while the others thereof are larger, and a set of antifricton drive rollers for each external gear, thc rollers of each set engaging respectively in the correspondingly sized holes' in the support and its respective gear and passing through the larger hole in the other gear.

7. In a hoist, a drive member, a driven member, a supportl for said members, and a driving connection between said members comprising an internal gear associatedwith one of said members, an external gear associated with the other of said members and in meshing engagement with said internal gear, and means cooperating with one of said gears and with said support to thereby maintain said gear against rotation with respect to said support but permitting orbital movement thereof, s'aid means being mounted to permit rotation about its own axis and` also movement in an orbital path.

8. In. a hoist, a drive Imember, a driven member, a support for said members, and a driving connection between said members comprlsing an internal gear associated with one `of said members, an external gear associated with the other of said'members and in meshing engagement with said internal gear,

and means cooperating with one of said gears and with said support to thereby maintain said gear against rotation with respectto' said support but permitting orbital movement thereof, said means comprising a roller mounted to permit rotationy about its own axis and movement in an orbital path.

9. In a hoist, a drive member, a driven member, a support for said members, and a driving connection between said members comprising an internal gear associated with one of said members, an external gear associated with the other of said members and in meshing engagement with said internal gear,

and means cooperating with one of said gears and with said support to thereby maintain said gear against rotation with respect to said support but permitting orbital movement thereof, said means comprising a roller mounted at one end in the support and having its opposite end engaging said gear to permit rotation of the roller about its own axis and movement in an orbital path.'

10. In a hoist, a drive member, a driven member, a support for said members, and f a driving connection between said members comprising an internal gear associated with one of said members, an external gear associated with the other of said members and in meshing engagementl with said internal gear, and means cooperating with one of said gears-and with said support to thereby maintain said gear against rotation with respect tosaid support but permitting orbital movesignature.

JAMES P. JOHNSON.

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