US1876954A - Hoist - Google Patents

Description

Sept. 13, 1932. P. JOHNSON HOIST Filed April 25, 1929 2 Sheets-Sheet l Sept. 13, 1932. J, p, JOHNSON 1,876,954

HOIST Filed April 25, 1929 2 Sheets-Sheet 2 Patented Sept. 13, 1932 1 Umso .STATESPATENT orties) g JAMES 1. JOHNSON, or` oLEvnLANnoHIo, AssIeNon To THE J. i. JOHNSON ENGINEER- g ING COMPANY, OF CLEVELAND, OHIO, CORPORATION OF OHIO HOIST Application led April 25,

An object of the invention isto provide a hoist which is efficient in operation, and which-is formed of relatively few parts capable ofy being inexpensively manufactured. Another object is to provide a hoist which has a high capacity rating in relation to its size. f Another obj ect is to provide a hoist wherewV 4 in the end thrust between the operative parts 15, willbe absorbed and such parts maintained in the proper alignment, thus improving the smoothness of operation of the hoist and increasing the life of the moving parts thereof. Another object is to provide a hoist Wherein the wheelor sprocketl for the actuating chain is maintained in tensioned'driving relationship with the power or main shaft of the'hoist. f Further Aadditional Objectsv are toV provide z5 a high speed hoist, one ,which may-be readily assembled or disassembled, and one capable of thorough lubrication; while during the j following detaileddescription of the inventionithere will be seen to be still further objects and advantages inherent therein, which have not been specifically mentioned above.

In the accompanying drawings illustrating several embodiments of the invention,

Figure 1 is'an end elevational view of the hoist, loo-king toward the actuating orvoperating end thereof.

Figure 2 isa longitudinal central vertical section throughthe hoist.

Figure 3 is a transverse vertical section through the hoist, taken approximately on line 3-3 of Fig. 2.

Figure 4 is a fragmentary sectional view through the hoist for the purpose of illustrating diagrammatically the manner in whichthe end thrust of the working parts is absorbed, and

Figure 5 is a view similar to Figure 4, but showino' a slightly modified form.

The. hoist comprises a substantially cylin-A 1929. Serial No. 357,937. f

drical casing or housing 10, open at one end and closed at the other end, this last named end being also provided ,with a projectingl subs-tantially semi-circular retaining guide or coveringy member 11 for the operating or actuating chain later to be described. The casing is provided with a hook 12, suitably swiveled in the upper side. thereof, by means ofwhicli vthe hoist may be suspended from a suitable support. casing 10 is closed by a cover plate 13, removably attached lthereto by means of ya plurality ofkbolts 14. Thisrv cover plate 13 is preferably formed of hardened metal, such as case hardened steel, so that it may form one ofthe races for each of a number of` roller bearings or anti-friction members.

The casing 10 is provided with a centrally arranged opening 15 in the closed end thereof, while the cover 13 is provided with a somewhat larger tapered opening 16 in alignment with the first namedl opening, these openings being provided so that the main power or actuating shaft may extend therethrough and be supported therein. This shaft has a re-` duced portion 1'? arranged in the opening 16 in the cover plate,'and projecting outwardly beyond the same, the projecting portion thereof being threaded to receive retaining nuts 18. The reduced portion 17 is supported by anin- The open end of the soV wardly tapered roller bearing 19, the tapered wall of the opening 16 in the cover forming one of the races of this bearing. Inwardly of. the reduced portion 17 the main power or actuating shaft is provided with an eccentric 20, having at its inner edge an outstanding flange 21, separating the eccentric portion from an enlarged concentric portion 22. Beyond the portion 22 the shaft has a reduced portion 23, which eXtends'through the opening 15 in the closed end of the casing 10, and is provided with an outwardly projecting reduced portion 24 threaded at its outer end, this last named portion extending a substantial distance beyond the closed end of the hoist casing and receiving a hoist actuating or operating mechanism.

The threaded projecting end of the portion 17 is enclosed by a metal cap or vclosing member 25, secured to the cover 13 by a plurality of screws 26. An internal gear 2? is arranged within the housing formed by the casing and the cover member and has a hub portion 23 loosely arranged upon the portions 22 and 23 of the power shaft and rotatably supported thereon and in the casing by a rollerI bearing 29 and ball bearing 30, respectively. The internal gear 27 is arranged concentrically with respect to the power shaft and is free, as already stated, to rotate independently thereon, the hub portion 28 ofthe gear having fined thereon a suitable sprocket wheel 32, about which the hoist or work chain 33 extends. An external gear 34 formed of suitably hardened metal is provided with a central tapered opening, the wall of which forms one of the races for a tapered roller bearing 35, arranged on the eccentric portion 2O of the main power or actuating shaft, so that while the external gear 34 is independently rotatable upon the eccentric portion of the shaft, it will be oscillated or ino-ved eoceutrically by suoh portion.

The inner face of the cover 13 is provided with a series of circumferentially spaced recesses 36, and the adjacent face of the gear 34 is also provided with a corresponding number of similar recesses 37, each of the recesses on one member being adjacent a recess on the other member, so as to cooperate therewith and form a retaining chamber or housing for an anti-frictionroller member, such as the balls 38. These balls 33 are of less diameter than are the recesses, with the result that as the gear 34 is moved eccentrically by t-he eccentric portion 2O of the main power or actuating shaft, they will partake of an orbital movement, and while allowing such eccentric movement of the gear will prevent the rotation thereof relatively' to 4the cover 13 of the housing or casing 10.

lt will thus be seen that when the main power or actuating shaft is rotated that the eccentric movement of the gear 34 will cause a certain number of t-he teeth of the saine to successively mesh with the teeth of the internal gear 27 and to rotate the latter gear, and in turn, the work chain sprocket 32. Of course the desired ratio between the gears 27 and 34 may be obtained by varying t-he pitch diameter of the same.

Referring to Figure 4, it will be apparent that when the teeth of the two gears at the point A are in mesh, a force will be created, tending to separate the gears at such point, and that such force will cause an equal pressure on the tapered bea-ring 35, this last pressure tending to force the gear 34 toward the cover 13. This end thrust, however, will be taken care of by the anti-friction balls 33, and since such balls are free to turn in any direction, the wear will be distributed over their entire surface. Even though a standard annular ball bearing were to be used in place of the tapered roller bearing 35, there would still be a resulting end thrust, since ,the roller or ball drive is only on one side of the gear and, therefore, has a tendency to pull away on that side. Slowever, the balls 38 will take care of this condition, with the result that the operative parts of the hoist will be maintained in the proper alignment.

ln Figure 5 a slightly modified fo-rm of the anti-friction drive is shown, wherein hollow rollers 39 arranged in elongated recesses 33a in the housing and gear are used, to vrestrict rotation of the gear while permitting eccentric movement thereof while a ball 39b is arranged in each roller and serves the function of absorbing or taking care of the end thrust above mentioned.

ln order to increase'the elliciency and the general operation of the hoist, a roller bearing 40 is interposed between the cover 13 and the outer circumference of the internal gear 27, while an annular lubricating gasket 41 is carried by ythe casing 10 and bears against the outer side of the internal gear 27.

rlhe outwardly extending reduced portion 24 of the main power or actuating shaft has keyed thereon a plate member 42, provided upon its outer face with friction material 43, and an externally threaded sleeve 44, upon which lits the internally threaded hub of an actuating chain sprocket wheel 45, as is well understood in the art. rlhe inner face of the sprocket wheel 45 is provided with friction material 43, while a floating ratchet member 47 is supported upon the hub of the sprocket wheel 45 and cooperates with a spring tension pawl 48, mounted upon a stud 49 carried by the casing 10. When the actuating or hand chain 50 is moved in the right direction the sprocket wheel 45 will'travel inwardly toward the casing upon the threads of the sleeve 44, until it clamps the ratchet wheel 4'? between the friction materials 43 and 46, thus clutching the sprocket wheel to the main power or actuating shaft through `the plate member 42 keyed to such shaft. rlhe further rotation of the sprocket wheel by means of the hand chain 50 will cause the rot-ation of the main power shaft and the oscillation of the external gear 34,which,in turn,will rotate the internal gear 27 and the sprocket 32 upon which the hoist or work chain 33 is mounted. During such movement the ratchet wheel 47 will rotate with the sprocket and the plate member 42, and the pawl will idle over the teeth of the ratchet. As soon as the work has been hoisted to the desired position and the operation of the sprocket 45 stops, reverse rotation will be prevented by the engagement of the pawl with the teeth of the ratchet wheel 47, until the sprocket wheel 45 has been manually revolved, so as to thread outwardly upon the threaded sleeve 44.

However, in order to provide for smooth operation of the device it is advantageous to arrange the sprocket wheel 45, so that it will have a tensioned driving connection with the main power shaft, both before and after it has been clutched thereto through the plate 42. To this end a washer member 51 is keyedl to the extension 24of the shaft at the end of the externally threaded sleeve 44, while a clamping or retaining member 52, also keyed to the shaft, is held in cooperative relationship with the member 5l by means of a retaining nut 53 to clamp a washer 54 therebetween, such washer being provided with a pair of diametrically oppositely extending spring arms 55, the outer ends of each of which lie between a pair of spaced lugs 56 and 57, formed on the sprocket wheel, as clearly shown in Figs. 1 and 2. Hence, as soon as the sprocket wheel 45 is y,rotated in either direction, the lugs 56 or 57 will come into engagement with the ends of the arm 55 before the wheel is clutched to the shaft, with the result that the wheel will be operatively connected to the shaft by a tensioned connection, although, of course, such connection ordinarily will not be sufficient to actuate the shaft under working conditions.

However, the tension created between the sprocket wheel 45 and the shaft will provide a smooth operation of the hoist.

Althoughseveral embodiments of the invention have been illustrated and described herein, it should be understood that the same is not to .be limited thereto, but is susceptible of such modications and adaptations as fall within the scope of the appended claims.

Having thus described my invention, I claim:

l. In a hoist, a housing, a power shaft supported adjacent one of its ends in said housing upon a tapered roller bearing 'and having an eccentric portion adjacent such end, a gear associated with said eccentric portion and mounted upon a roller bearing oppositely tapered with respect to said first named bearing, a second gear concentrically associated with said shaft and meshing'with said j first named gear, said housing and said first named gear having their adjacent faces provided with a plurality of depressions, the

depressions in one cooperating with the depressions in the other to form chambers, and v balls arranged in said chambers for restricting rotation of said first named gear while signature.

JAMES P. JOHNSON.

permitting eccentric movement thereof and for receiving the end thrust incident to the meshing of said gears.

2. In a hoist, a housing, a rotatable power shaft having an eccentric portion and supported adjacent one of its ends insaid housing upon a tapered roller bearing, an external gear associated with said eccentric portion and mounted upon a roller bearing op positely tapered withl respectv to'said first named roller bearing, an internal gear concentrically associated with said shaft and independently rotatable thereon, a sprocket wheel associated with said internal gear to

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