Free-chain planetary hoist
US RE22237 E
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Description (OCR text may contain errors)
Dec. l5, 1942. F. w. coFFlNG FREE-CHAIN PLANETARY HOIST Original Filed Oct. 8, 1937 4 Sheets-Sheet 1 Dec. 15, 1942. F. w. coFFlNG Re. 22,237
FREE-CHAIN PLANETARY f ioIsT Original Filed Oct. 8. 1937 4 Sheets-Sheet 2 7 77 "0- lNvENToR. Z7 Fria/fm( n. ('aff//va (0J ATTORNEY.
Dec. 15, 1942. F. w. coFFlNG Re- 22,237
FREE-CHALN PLANETARY HOIST Original Filed 061'.. 8, 1937 4 Sheets-Sheet 4 INVENTOR. fkf/v/cx 144 (aff/N6.
Reiseued Dec. 15, 1942 FREE-CHAIN PLANETABY HOIST Fredrick W. Comng, Danville, Ill.
Original No. 2,269,438, dated January 13, 1942, Serial No. 167,959, October 8, 1937. Application for reissue March 6, 1942, Serial No. 433,680. In Great Britain September 8, 1937 17 Claims.
This invention relates to a chain or like hoist capable of free-cham action, embodyin a planetary type mechanism, a brake mechanism, a speed control or governor mechanism and which is hand operable for load elevating and lowering and hand controlled.
This invention is a radical improvement upon certain prior patented structures such as illustrated in the prior Patents No. 1,862,331 dated June 7, 1932; No. 1,937,331 dated November 2, 1933; No. 1,973,844 dated September 18, 1934; No. 1,999,036 dated April 23, 1935; and No. 2,044,565 dated June 16, 1936, and the pending application Serial No. 755,259 led November 30, 1934, entitled Free-chain hoist, allowed February 25, 1937, now Patent No. 2,099,676 dated November 23, 1937.
This invention also is an improvement upon that disclosed in the pending application Serial No. 49,919, filed November 15, 1935, entitled Freechain planetary hoist, now Patent No. 2,150,419 dated March 14, 1939.
This invention includes the basic features of a brake mechanism, a speed control or governor mechanism, and a planetary mechanism.
The chief object of the invention is to produce a hoist which will have a highly desirable safety factor arrangement and which is capable of freechain action, when desired, in either direction.
Another object of the invention is to produce a load hoisting structure having parts capable of selective association to vary the Speed and capacity thereof as hereinafter set forth.
The chief feature of the invention is the hoist which is capable of accomplishing the chief object.
The full nature of the invention will be understood from the accompanying drawings and the following description and claims.
In the drawings Fig. l is a central sectional view through` a hoist embodying the present invention, the load chain being omitted and extreme ends of the supporting hook and operating handle being omitted for clearness, a member of the latter being shown in position to actuate the brake mechanism.
Fig. 2 is a side elevational view looking at the handle end of the hoist, parts of the Supporting hook and the handle being omitted and other parts of the handle mechanism being broken away to show the same in section and to illustrate other parts more fully, dotted lines indicating the chain passage, sprockets and chain portions.
Fig. 3 is an elevational view of the immediate brake operating and control mechanism, parts being broken away to show the same in section and to illustrate other portions of the same and other parts more fully.
Fig. 4 is a similar view of the selective manual control for the planetary clutch arrangement, whereby free-chain lowering without the load is possible. v
Fig. 5 is a transverse sectional view of the extended portion of the housing associated with the parts illustrated in Figs. 3 and 4.
Fig. 6 is an elevational view of the governor or speed control mechanism.
Fig. 7 is a side elevational view of a portion of the hoist, a portion of the handle being broken away and sectioned to show other portions thereof in greater detail, the brake actuating handle member being shown in non-actuating position.
Fig. 8 is a central sectional view of another form of the present invention.
Fig. 9 is a. side elevation thereof.
Fig. 10 is a sectional view taken on line III-I3 of Fig. 8 and in the direction of the arrows and of the one-way clutch shown therein.
Fig. 1l is a central sectional view of another form of the invention and similar to that shown in Figs. 8 to 10, inclusive.
Fig. 12 is a side elevation thereof.
In Figs. 1 to 7 of the drawings, I0 indicates one portion of a housing, and I I a complementary cover forming portion thereof. The two are suitably secured together as at I3. The two form a chamber Il for receiving the head I5 of a supporting hook I6 having the cylindrical portion I1 swiveled in the bearing Ia and lab.
The two portions I0 and II of the housing and cover also provide a chamber I9 in which is mounted a load chain engaging sprocket 20 carried by the shaft 2| and herein the two are shown integral. The cover portion II has an outwardly directed hub portion 22 which rotatably supports the portion.23 of the shaft 2l. The shaft isfurther extended at 24 and rotatably supports the hub portion 25 of the body portion 26 of the handle structure having theextended` portion 2l. The body portion 26 of the handle is extended toward the cover as at 28 and telescopes, as it were the adjacent portion 22a of the cover, as shown clearly in the upper right hand portion of Fig. l.
The shaft portion 2I-see Fig. 1--as well as portions 23 and 24 are provided with aligned and communicating lubricant receiving passages 29, 30 and 3l, respectively, the latter being threaded to receive a closure in the form of a vcap screw 32 bearing on a washer 33 that engages the outer end 34 of the hub portion 25 oi' the handle. By this means the handle is not only detachably associated with the hoist structure but lubricant may also be supplied to the interior mechanism to which referencewill be had hereinafter, which mechanism includes a planetary system.
The lower part of chamber |9 is open as at 35. In aligned bearings 36a and 36h formed in housing I0, and cover and housing I|, respectively, is mounted a shaft 31 which rotatably supports an intermediate sprocket or gear 38, therev being interposed therebetween an anti-friction construction in the form of rollers and the like 39.
The purpose of this intennediate sprocket or gear will be hereinafter set forth.
'I'he housing I0 includes a depending well portion 40 while thecover includes a depending portion 4|. The aligned apertures 42a and 42h in the well portion and 43 in the depending portion 4|, rotatably support a shaft 44. The cover plate 45 is suitably secured as at 46 to the well portion 49 and closes the same.
The housing I8 includes chamber 41 which is closed by a cover plate 48 suitably 'secured to the housing'as at 49 and said cover plate 48 is recessed as at 5U to provide a closed bearing which receives an anti-friction structure 5| in the form of a ball race, or the like, for rotatably supporting the shaft portion 52. As previously set forth, shaft portion 23 is rotatably supported in the hub portion 22 of the cover and housing member The shaft portion 2| which projects through the partition portion 53 of the housing i is enlarged as at 54 and is rotatably supported by the inwardly directed hub portion 55 on partition 53. This hub portion 55 constitutes the rotatable support for the primary shaft 2| with which is associated the handle structure, previously briefly mentioned.
snoobly associated with the lug portion 1s on the weight 12.
The opposite end oi' each shoe portion 61 is pivotally connected as at 11 to the free end of the other lever arm 1| and counterweight12. If desired, one or more springs 18 may be associated with the weighted arms as at 19 and anchored to the plate portion 99 as at 89. Substantially the same form of centrifugal operable speed control is illustrated in Fig. of
application Serial No. 49,919. For a more complete description of the operation of the same per se reference is made thereto.
The extended end 54 of this primary shaftsee Fig. 1--is recessed at 56 and receives the end 59 of the shaft 59, the two shafts being rotatably associated together by the anti-friction structure, such as the rollers 51. This shaft 52, 58, 59 is the supplementary shaft and with it is associated the planetary transmission, brake mechanism and the speed control or governor mechanism hereinafter described. f
A plate 60--see Fig. 1-has a hub portion 6| keyed as at 62 or otherwise suitably secured to the supplementary or secondary shaft 59. Concentric therewith and integral with plate 68, is
a brake drum structure 63. Operatively associated therewith is a brake band 64 provided with brake lining ,65, or the equivalent. Reference will be had hereinafter to the brake operating structure per se, although it is to be understood the brake band substantially encircles the brake drum`-'see Fig. 3.
At the extreme left hand portion of Fig. 1 is illustrated the speed control and the same is lmore fully illustrated in Fig. 6. In said figure 66 indicates a suitable friction lining; or the like, carried by the-shoe portions 61, each of which has onen? connected at 68 to a link 69 pivotally connec at 10 to the plate 60. An arm 1| also is pivotally connected as at 10 to the plate Rotatably supported on the hub portion 55 of Fig. l-is the external'planetary gear housing 8| having external ratchet teeth 82 offset toward the left relative to the central support. This offset arrangement forms a chamber 83 closed by a press-fitted or otherwise suitably secured plate 84, ,the shaft 59 extending therethrough. Thus, lubricant supplied to the chamber 83 through the other'and primary shaft 2|-23-24 does not enter the chamber 41 except chamber portion 83 thereof enclosed Within and formed by the cover 84 and the planetary member 8|.
The extreme left hand and exposed end of shaft 2| (portion 54)-see Fig. l-is provided with a plurality of keyways, four in number, of which two are shown, receiving keys 85 that key the pinion support plate 86 to the handle operable shaft 2|. Plate 86 supports the pinion shafts 81, each of which rotatably supports a pinion gear 88. Press tted or otherwise secured to the interior of portion |89 of the exterior or desired, the teeth 9| vmay be formed directly upon the interior of portion |89. In the rotation of shaft 2| (handle operable) for load elevating the pinions revolve about the shaft 59 having sun gear teeth B9 thereon. In such revolution of the pinion gears 88, the shaft 59, the speed control device and the brake structure do not rotate with the handle operable shaft 2 I, for the ratchet teeth 82 on housing 8| is arranged to a Ways permit housing 8| to rotate with the sha 2 |-23- 24 in the load elevating direction.
The foregoing also is suificient for an understanding of free-chain movement in the load elevating direction when such movement is' desired when there is no load on load chain |12.
The means for holding planetary member 8|- |89 against rotation in one direction and permitting normal rotation in the opposite direction is shown clearly in Fig. 4. The locking dog or paw] 92 is supported on the shaft 93 carried at opposite ends by the well portion 40 of housing- 0.
key 91 or an equivalent device, as at 98 to the housing Ill or the well portion 40 thereof. This spring structure normally retains the dog 92 in contact with the ratchet teeth 82 and permits the ratchet to rotate counterclockwise, as shown in Fig. 4, but constrains dog 92 to prevent reverse rotation of the ratchet, as shown in the same gure, unless the dog is Withdrawn from ratchet engagement which is accomplished as follows:
The dog 92 includes a spring support 99 with which is associated a spring |88. The other end thereof is carried by a pull rod IDI that extends through aperture |||2 in cover plate 45 of the well portion 4l. Said rod terminates in a finger piece |03.
It will be noted the draft, as indicated at |04, see Fig. 4, on the dog is such that the greater the tendency to rotate clockwise,'the greater will be the locking effort exerted by the dog. The dog is prevented from dropping out of tooth engagement by spring 06. When finger piece |03 is pulled outwardly or downwardly, spring elongates, but the dog 02 is not released until the ratchet wheel has rotated counterclockwise sumclently to clear the associated ratchet tooth 02 from the pawl draft. Thereupon, spring 03 elongates and spring |00 releases the dog from the ratchet.
To maintain the dog 02 out of ratchet engagement, rod III-see Fig. 4-carries pin |03a having ends normally slidable in slots I02a in the tube 45a carried by cover 45. 'I'he end of this tube 45a also is notched transversely as at IOIa. When pin |03a is seated therein, pawl or dog 32 is held out of ratchet engagement. When released, the pin nests in slots |02a and spring |00 tends to hold same nested and spring 00 functions to restore the locking dog 92 to operative engagement with the ratchet.
If in the load elevating movement, there should occur a slight reverse movement of ratchet teeth 02, portion 33a of pawl immediately engages the adjacent surface of well 40, and prevents pawl tilting in a counterclockwise direction-see Fig. 4.
The combined planetary ratchet wheel when free from the dog, may rotate in either direction whereas previously it was free to rotate only in a counterclockwise direction.
Reference will now be had toFigs. 3 and 5, wherein the operating and supporting mechanisms of the brake structure are more specifically illustrated. The brake band 64, carrying the lining 05, if desired, has one end |05 encircling shaft 93 supported by the well 40 and by the interminate ear |01 rigid therewith--see Fig. 5. Any other desired form of brake band anchorage may be employed.
The other end of the brake band includes an elongated aperture |00. One curled end of the spring H0 is associated with the aperture. The opposite curled end of spring I 0 is secured to the apertured end of a threaded member ||I having the externally exposed tool engageable portion |09 and having threaded engagement with the threaded aperture ||2 in the well portion 40. The tension exerted by the brake band in normal operation is adjusted by member Il and such adjustment is retained by the nut ||3 threaded on member I and bearing upon the well surface.
An arm ||4, see Fig. 3, projects into the aperture |00 and is notched as at ||5 and is carried by shaft IIS supported by opposite sides of the well structure 40, as shown in Fig. 5. Brake arm III is one arm of a bell crank pinned as at ||1 to'the shaft IIB, the other arm I I0 thereof being pivotally associated with a pair of links H9' at |20. The opposite ends of said links are pivotally associated at |2| with arm or lever member |22 pinned or otherwise secured as at |23-see Fig. 5-to the shaft 44 which, as before stated, is supported by the two depending Walls of the well portion 40 and by the depending -portion 4| of the cover and housing member I I. 44 projects through the portion 4| and on its projecting or extended end has secured to it, as by pinning |24 or the like, a lever arm |25-see Figs. 2, 5 and '1. The latter figure also shows rod |0| retained in ratchet dog locking-out position.
This shaft The handle 21-see Figs. 1 and 7-includes an offset recessed portionln which slidably supports a laterally projecting bolt |21 normally projected toward the hoist body by spring |20, as hereinafter set forth. The handle supports a cover portion |23 apertured at |30 for the manual control rod |3I, which is reciprocated longitudinally of the handle. Rod |3| has the oil'set portion |32 and the end |33. f
An angular and stiff spring member |34 is carried by a power pawl, hereinafter to be described, and the spring has its free end apertured as at |35 to receive the end |33, the angular portion of the latter and the oiset portion permitting relative movement of the power pawl without interference from the rod I3I. When, however, the rod |3| is actuated so as to cause the same to move upwardly, having reference to Fig. 7, the oifset portion |32 engages the angular member |34 and the wire member |36 slidably associated therewith and which is pivotally associated as at |300r with the bolt |21, causes the bolt |21 to be retracted so that it moves toward the right in Fig. 7. This movement retracts the bolt |21 so that the exposed end of the bolt no longer extends outwardly a sumcient distance to engage a stop surface I 31, see Fig. 2, on the cover portion of the hoist.
The flat spring I30-see Fig. l-carried by the handle bears on the shouldered portion |2111 of the bolt |21 and further retracts the bolt so that it clears the ledge and stop portion |31 and is ln position to engage the inclined portion 23R-see Fig. 2--of the member |39 pivoted on an extension of the shaft 31 that mounts the idler sprocket Bil-see Fig. 1. The opposite end of the member |39 is recessed as at |4| and straddles, as it were, the lever arm |25 which is the brake actuating arm. Thus, in the normal operation of the handle, which can move from the position shown in Fig. 2 counterclockwise until the handle engages the stop |06 on the cover portion, the bolt member |21-see Fig. l-is ineiective for actuation. However, after the bolt member |21 engages the stop |31 on the cover portion, further movement in the load elevating direction is impossible. The brake mechanism is arranged so that it will only function for load lowering when it is actuated by means of the bolt |21 clearing the stop |31 and tilting the lever |33 for tilting the shaft 44 through portion |25, which releases the brake mechanism through lever III-I |8- see Fig. 3.
The handle structure herein disclosed is similar to the handle structure shown in Patent No. 1,937,331-see Figs. 4 to 6 thereof. Rod |3| see Fig. l-herein is similar to rod 35-I35 shown in said patent, except in this instance, the end of rod |3| is offset. Member |36 herein is similar to member 9| of the patent. Plate 34 of said patent disclosure is similar to plate |34 shown hereinsee Fig. 7. Spring |20 is the equivalent of spring 32 of said patent and has a similar function in that it constrains the power pawl |43, pivotally supported by the handle, toward engagement with the ratchet teeth |42-see Fig. 1. In the present instance, these ratchet teeth on the shaft 2| are designated by the numeral |42. In the patent, the ratchet teeth are designated by the numeral 20 and are a part of the shaft I6. The function of the power pawl |43 carried by the handle 21v is substantially the same as that of the power pawl 3| shown and described in Patent No. 1,937,331.
The spring |20 actuates this pawl indicated in Fig. l by the numeral I and carrying the portion I, pivotally supported as at |45, is substantiallythe same as the pawl 2| carrying the stop 59 and pivotally supported at Il. illustrated in Fig. of said patent. However, in the present instance, spring |00 normally constrains4 the plunger member |21 toward its seated position without load on the chain, for the reasons hereinafter set forth, the rod III-see Figs. 2, 4
and 'I-is pulled outwardly and if'it is not deand thereby differentiates `from the spring shown in Fig. 4 of the before mentioned patent, which is constrained in the opposite direction. In other words, spring |20 in this instance, has the same function that the ringer piece 8| has in the aforesaid basic patent disclosure. By reason of this simplification, the shoulder 85 and the curved portion |3I of the pawl of the patent are not required. The mechanism ior reciprocating the rod |3| and carried by the handle near the free end thereof is substantially that shown in the broken away portion immediately and `to the left in Fig. 4 of Patent No. 1,937,331, and is not duplicated herein, although it or equivalent mechanism is comprehended within the present invention.
The load chain |12 in Fig. 2 is shown having one end and the surplus end secured to the boss |1| on the housing. The chain |12 for load lowering passes inwardly into the opening |13 forming the communication to the chamber I9. The chain then engages the sprocketl 20 and then passes downwardly and outwardly, as shown immediately to the right in Fig. 2. This is the simple or single-line chain operation.
From the foregoing, referring to the hoist operation per se, as previously pointed out, the chain |12, when relieved from load, may be pulled through the hoist in the load elevating direction remain stationary. For load elevating, reciprocation of the handle causes rotation of the load or power sprocket 20 and as before stated-sec Fig. l--during this operation the brake mechanism and the governor mechanism remain stationary.
In order to lower the load, the rod |3| is actuated and the handle tilted further to tilt lever IBS- see Fig. Z-Which releases the brake to the desired degree, dependent upon the amount of tilting of member |39. Thus, the operator has control of load lowering. Should the speed of lowering, due to the operators ignorance or carelessness, exceed that for which the hoist is adjusted for safety, the governor structure automatically becomes operable and the counterweights--see Fig. S-cause the shoes to engage the adjacent braking portion of the hoist to retard the rate of lowering to that for which the centrifugal governoris adjusted.
In this load lowering the pawl 92-see Fig. 4 -due to the reversal of the rotation of the ratchet wheel, engages one of the teeth thereof and does not ratchet relative to the wheel, and, therefore, holds the planetary housing 8| so that the pinion gears rotate within and revolve around in the ring gear 9| which causes the brake supporting shaft and the governor supporting -shaft to rotate through the planetary system.
Therefore, in load lowering under load and controlled through the handle, the brake mechanism as a free-chain structure and the handle may y `sired to hold it outwardly manually. the rod is turned a quarter turn and the pin Ilia is seated in the notches |0|'a-see Figs. 7 and 4- holds the spring |00 extended and pawl 92 out oi'Y ratchet engagement.
If there be load on the chain, the locking dog 92 will not release from the ratchet due to the draft before mentioned-see Fig. `4. Reverse rotation of the ratchet, therefore, is required but i only to asuflicient degree to clear the draft interlock on the pawl and when that clearance is effected, the pawl 92- is released by its spring |00 inopposition to spring 96 and is withdrawn and held out of ratchet tooth engagement. Then the chain may be operated as a free-chain in the load lowering direction. In this free-chain movement, the brake mechanism is stationary and, therefore, the governor structure is not operable and the sun gear accordingly remains stationary so that the pinions and the ring gear rotate with the load or power sprocket.
The load may be held in suspended relation by the handle being moved into position so that the plunger |21 does not engage the lever |35 Which actuates the brake and the brake mechanism thus is retained in braking position, and the handle is prevented from being rotated in a `direction opposite to the load elevating direction because the pawl 92 engages the ratchet and holds the ratchet stationary. Dropping of the load cannot be accidentally effected as long as there is weight or load on the chain because of the draft |04 on the pawl 92. The chain without load only can be dropped intentionally by releasing the pawl 92 as aforesaid and operating the handle 21 to free its pawl from its draft lock. Thereupon the chain will escape and drop, and the handle, if moved at all, will only swing upwardly in a. counterclockwse direction until it engages the stop |06.
In the form of the invention illustrated in Figs. 8 and 9, numerals of the three hundred series indicate parts identical with or similar to those of the primary series illustrated in Figs. l to 7 movement in the load lowering direction and inclusive. Numerals of the four hundred series have been utilized without regard to the primary series of numerals.
This form yof the invention incorporates a chain and wheel as a source of power in place of the ratchet operating lever handle type shown in Figs. l to 7, and a chain guard. In Figs. 8 and 9 the power is applied to the load chain sprocket through the planetary system in a manner broadly similar to that illustrated in application Serial No. 49,919. Thev present form of the invention includes the governor or speed control structure as well as the braking structure, both, however, operative relative to the load chain through the planetary system. The braking structure and planetary release mechanism is similar to that illustrated in the 4ilrst illustrated form of the invention, but operable by means associated with the chain power wheel dissimilar to that of the handle lever associated means shown herein.
In the present form of the invention, load sprocket" 320 is rigid with shaft 32| within which is mounted shaft 324 in turn rigid with shaft portion 359. The braking structure includes drum 203 and plate 300 rotatably mounted on shaft 350. A one-way clutch structure locks the plate 360 to the shaft 359-324 in load lowering movement but permits, without such locking, free rotation of said shaft 353 in load elevating direction as follows:
Similar to the disclosure in Figs. 2 and 4 of application Serial No. 49,919, Figs. 8 and 10 herein disclose a ratchet 433 rigid with shaft 353 by the key 451 and having teeth 439 engaged by pawls or dogs 412 pivoted at 413 on the inside faoe of Dlate 350 and angle brackets 413e secured to plate 380 at 413b. Springs 41| secured at 415 and 415e to the plate 350 normally constrain dogs 412 into ratchet tooth engagement and permit relative rotation in load elevating direction but prevent relative rotation in the load lowering direction.
As disclosed in Fig. and the last mentioned application, a plurality of pairs of pawls are provided and the spacing between adjacent pawls of different pairs is unequal for the purpose mentioned in said application.
Shaft 353 has teeth 333 constituting the sun gear meshing with pinions 30B rotatable on trunnions 331 carried by plate 385 keyed as at 305 to shaft 32|. When the ring gear 390 is held against rotation by the holding pawl (similar to pawl 32 in Fig. 4) engaging ratchet teeth 382 of member 33|, load gear 320 is rotated through the planetary system for load elevation. This arrangement, while operating to elevate loads at a slower rate than the first form ofthe present invention, is capable of elevating greater loads for the same effort applied to the shaft 324 as is applied to shaft 24.
In this form of the vinvention the braking structure and governor structure are normally ineffective during load elevation, but are effective for load holding and/or in load lowering.
Portion 354 of shaft 32|, see Fig. 8, is rotatably supported on shaft 324 by rollers 351 at one end and by rollers 405 at the other end. Shaft 32| is also rotatable at one end in bearing 355 of partition plate 353 and in bore 322 of housing 3|| at 323. An Alemite lubricator 405 is associated with passage 401 to supply lubrication.
Keyed as at 408 to the exposed end of shaft 324 is hub 403 of a ratchet 4|0 having teeth 4| I. Washer 334 and nut 332 retain the ratchet on the shaft 324. Encircling hub 403 are rollers 4|2 supporting hub 4|3 of the chain wheel 4|4 having the chain groove periphery 4|5. Seated therein is the transverse link endless chain 4|5 retained therein and on the wheel by chain guard 4|1-see Fig. 9-having arms 4|8 rigid with housing 3| I.
A pawl 4|9-see Fig. 9-having tooth 420 is pivoted at 42| in bracket 432e secured at 423 to the wheel 4|4. In counterclockwise or load elevating rotation of wheel 4|4, the tooth 420 engages the adjacent ratchet tooth 4|| of ratchet 4|0 so that shaft 324 rotates to transmit power through the planetary system to the load chain sprocket 320 to elevate the load. The ratchet clutch shown in Fig. 10 permits such movement without brake release or governor action. The pawl associated with the planetary gear housing ratchet teeth 302 has its usual function at this period of operation. It is not specifically illustrated herein because it is similar to pawl 92 shown in Fig. 4. The brake control mechanismsee Fig. 9-is associated therewith in a similar manner and herein control parts 40|a, 40|, 402a, 433 and 4|l3a are similar to the corresponding one hundred series numbered parts shown in Figs. 3, 4 and 7. Member IUI-|03 controls this pawl, not shown, but associated with ratchet 382.
Shaft 344-see Fig. 8is the brake control shaft similar to shaft 44 shown in Figs. 1. 2. 3. 5 and 7, and on its free end is mounted the hub of arm 425. Arm 425 is recessed at 425. A plun- 8er 42m-see Fig. 9-is slidable therein and is projected outwardly by spring 421 also seated in socket or recess 425. Plunger 423e includes a tooth portion 423 with relieved face 420. A pin 430 is secured to plunger 425e and rides in slot 43| in arm 425.
Pawl 4|3-see Fig. 9-includes a tooth 432 and an approach cam face 433. In the load elevating movement (counterclockwise rotation) of wheel 4|4 the pawl 4I9 has its cam face 433 engage relieved face 423 of plunger 42Go and depresses the latter without rocking lever arm 425. Spring I I0, see Fig. 3, normally constrains shaft 44 and arm |25 toward the right-see Fig. 2. Arm 425 in a similar manner is constrained toward the Position shown in Fig. 9.
When it is desired to hold the load in elevated position, all parts are positioned as shown. When it is desired to lower the load, wheel 4|4 is reversed until tooth 432 engages toothI 423. Continued reverse rotation thereupon tilts arm 425 counterclockwise to rock shaft 344 to release the brake mechanism to the desired degree dependent upon the amount of reverse rotation. When brake release is effected, the speed control, naturally automatically becomes effective and prevents load dropping should brake failure occur. Of course. if there is disengagement between member 4|9 and 426a the brake mechanism immediately is effective for braking.
A spring 440 carried by the wheel 4I4-see Fig. 9-normally constrains pawl 4|9 into ratchet engagement. In the reverse rotation of the wheel 4I4 for brake release, if the load is positioned immediately adjacent the hoist, the power ratchet and pawl connection permits the load to remain stationary while the wheel is reversely rotated to cause pawl 4 9 to engage plunger 4260..
In Figs. 1l and l2 there is illustrated an improved and safer form of the invention illustrated in Figs. 8 to 10, inclusive. Numerals of the five and six hundred series indicate parts identical or similar to those illustrated in Figs. 8 to 10 by numerals of the three and four hundred series,. respectively.
Since the brake mechanism, speed control mechanism, planetary mechanism, immediate brake releasing mechanism, one-way ratchet clutch mechanism, combination ratchet and ring gear mechanism, and power applying mechanism herein are substantially identical to that illustrated in Figs. 8 to 10, no further description thereof is believed necessary.
The present form of the invention shows the "Alemitc" fitting 606 and supply passage 601 positioned opposite that shown in Fig. 8 since in Fig. 11 the cover housing 5I| supports an arcuate guard 693 that partially envelopes offset portion 698 of the chain power wheel 6|4. This guard, having reference to Fig. 12, is discontinuous for the lower left hand quadrant portion of the power wheel t0 provide clearance for the brake release mechanism.
Herein also-see Fig. ll-between collar 555 and portion 554 is interposed an anti-friction device 631. Similarly between hub portion 523 and bearing portion 522 there is interposed an anti-friction device 595.
In this form of the invention the chain guard SI1 instead of being superposed relative to the chain wheel is reversed relative thereto-,see Fig.
12--and the powerjchain IIB passes between the supporting arms IIB thereof.
Herein inner shaft 624 is longitudinally bored as at 695l and the outer end thereof is threaded at B94 to receive a headless threaded closure G93. 'Ihe opposite and closedend of the bore com- ,municates by ducts 692 with' the clamber 583. In this manner, lubricationcan be supplied directly to the interior of the planetary system. This lubrication may differ. if desired, from that supplied to the other and associated parts by the fitting 606.
The major improvement, however, is in that portion of the invention which is interposed between the power` transmitting and brake actuating pawl 6i! and the brake operating shaft 5M and the adjacent cooperating parts carried thereby.
In this form of the invention-see Fig. 12- pawl 6|! includes the tooth portion G32relieved as at 633 for the purpose described.- `Pawl 6|9 is pivotally supported at 62 I' on the offset bracket 632a secured at 623 to the power wheel portion Bil. Pawl BIS includes tooth 620 and the adjacent end of the pawl is squared as at 620er. Spring 640 normally constrains the pawl Vinto ratchet tooth engagement.
The housing H at 5I Ia-see Fig. lz-includes a stop portion, the purpose of which will be set forth hereinafter. The lever portion 625 carried by the free end of brake releasing shaft 544-see Figs. 11 and 12-mounts the spring pressed plunger 629 so formed on its projecting portion that when engaged by portion 633 of the pawl in counterclockwise rotation of the power wheel,
the plunger is forced inwardly into the socket in said arm 825.
Upon reverse rotation of the power wheel for load lowering and brake release, tooth B32 engages the projecting face of plunger VS29-see Fig. 12-and continued rotation of the power wheel tilts lever 625 to rock shaft 544 to secure brake release in the manner previously described herein. The resistance to such tilting tilts pawl GIS until in Vthe continued rotation of the power wheel, portion 620s of the pawl engages stop 5| la and further reverse rotation is prevented. This stop engagement prevents shearing or breaking off of the projecting end of the plunger B29.
While the invention has been described and illustrated in great detail in the foregoing description and drawings, the same is for example only and not in sense restrictive in character.
The several modifications illustrated and described. as well as others which will readily suggest themselves to persons skilled in this art, are all considered to be within the broad scope of the invention, reference being had to the appende claims.
'I'he invention claimed is:
1. In a reversing hoist, a handle, a ratchet engageable pawl pivotally supported on the handle, an arm carried by the pawl, a lever operable rod for tilting the arm for pawl movement, a longitudinally movable hoist control member carried bythe handle and bodily movable parallel to the pivotal axes of the pawl and handle, means opposing rod tilting of the pawl, a tiltable lever carried by the member and associated with the ann for tilting said lever and securing longitudinal movement of the member, and means opposing the effect of the first mentioned means and associated with the member.
2. In a hoist structure, the combination of a power operable shaft, a load chain engageable sprocket thereon, a planetary transmission including a sun gear, planetarypinions, a carrier therefor rigid with the shaft, a ring gear, the pinions being revolvable about the sun gear in the rotation of the power shaft when the sun gear is rotatable therewith, a supplementary shaft rigid with the sun gear, a brake drum also rigid therewith, a housing enclosing all of the aforesaid, a brake band for the brake drum normally constrained to lock the sun gear shaft to the housing, a ratchet mechanism operatively associated with the ring gear of the planetary system, and pawl means normally constrained to ratchet engagement and when engaged permit-` ting power shaft and ratchet rotation in load elevating direction without sun gear rotation, said pawl means when disengaged from the ratchet permitting sun gear rotation with power shaft rotation in the load lowering direction upon removal of brake band constraint.
3. A device as defined by 'claim 2, characterized by the addition of a speed governor including centrifugally operable means rotatable with and by the sun gear auxiliary shaft and rotation retarding means operatively engaging the housing for retarding the sun gear auxiliary shaft, power shaft and brake drum rotation in load lowering direction upon predetermined speed thereof in load lowering direction.
4. In a hoist structure, the combination of a power shaft having a channel extending therethrough, means closing one end of said shaft, a power member for rotating said shaft and detachably associated therewith and retained in associated relation by said closing means. a planetary transmission including a sun gear, sun gear shaft, planetary pinions, a ring gear and a pinion support, the ring gear having a chamber formation for nesting the planetary pinions and sun gear, the power shaft extending into said chamber and having operative connection with the pinion support for rotation of the pinions with and by the power shaft, said passage communicating with said chamber, and closure means interposed between the sun gear shaft and the ring gear for retaining lubricant in said chamber.
5. In a hoist, the combination of a power shaft and load elevating means thereon, a handie having a pawl and engaging a ratchet operatively connected with said shaft, a brake normallyconstrained to brake operation, a one way clutch between the brake structure and the power shaft permitting shaft operation in load elevating direction without brake operation or movement, said clutch connecting said power shaft and brake for braking or holding of the power shaft when not power rotated, means in juxtaposition to the handle and engageable thereby and connected to the brake, said means, operating the brake in opposition to the brake constraint to permit load lowering, and manually operable handle supported 'means permitting or preventing the last mentioned engagement as desired.
6. In a hoist including a ratchet, a power shaft, manual means for rotating the shaft in one direction, a pawl carried by the means for ratchet engagement and shaft rotation, `a brake structure operatively associated with the shaft, and brake operating mechanism controlled by the means including a rock-shaft, an operating arm thereon, a lever for operating said arm to operate said brake, and other means carried by the first mentioned means and manually controlled thereby for lever engagement for brake operation.
7. In a hoist, the combination of a two-part sion on one of the housing parts. said last meny tioned housing part including a partition from which the shaft extends, operating mechanism within said second mentioned chamber, a detachable closure for the latter, a. well portion depending from the second mentioned chamber forming portion, and a closure for the well portion.
8. A device as defined by claim '7, characterized by the addition of an operating shaft having operating means within the well portion and projecting therefrom and toward the other housing portion, and a projecting portion on the other housing portion including a bearing for said well projecting shaft.
9. In a hoist, the combination of an elongated flexible, load elevating and lowering means, rotatable means for moving same, a power shaft for rotating said rotatable means, a planetary system operatively associated with the shaft, a ratchet directly associated with the planetary ring gear, a pawl normally constrained to ratchet engagement and permitting ring gear rotation in one direction and preventing reverse rotation thereof, means operable in opposition to the constraint for withdrawing the pawl from ratchet engagement to permit ring gear rotation in the reverse direction, and means normally arranged to prevent lateral movement of the last mentioned means on pawl release and capable of locking said means in pawl release position when intentionally moved thereto.
10. A hoist as defined by claim 9, characterized by the pawl and the ratchet teeth having complementary draft formations whereby the -teeth are mutually self-locking in one direction,
pawl tooth withdrawal from ratchet tooth engagement requiring initial rotation of the ratchet in ratcheting direction for freeing the pawl from ratchet locking association for subsequent rotation of the ratchet in the reverse direction.
11. A device as defined by claim '7, characterized by the addition of an operating shaft having operating means Within the well portion and projecting therefrom and toward the other housing portion, a projecting portion on the other housing portion including a bearing for said well projecting shaft, and means operable by the coaxial means for operating said last mentioned operating shaft.
12. In a chain hoist including a pivotally mounted handle, a ratchet including power shaft, a. chain sprocket rotatable by said shaft, a pawl carried by the handle for ratchet engagement and shaft and sprocket rotation in handle movement, a band including brake structure adapted for operative connection to the shaft and sprocket when tending to lower the load but normally inoperative upon the shaft and sprocket 'in load elevation, a second ratchet adapted for operative connection to the sprocket, a second pawl means normally constrained to second ratchet engagement and permitting second ratchet rotation in load elevation by the sprocket and preventing reverse sprocket rotation for load holding purposes, manually operable means for releasing the second mentioned pawl means from second ratchet engagement to permit reverse sprocket rotation in load lowering, and brake operating means controlled by the handle including a rockshaft, an operating arm thereon, a lever for operating said arm to release the band of said brake structure, and means carried by the handle and manually controlled thereby for lever operation for brake band release when the second mentioned pawl means has been released from second ratchet engagement to permit sprocket load lowering rotation.
13. In a chain hoist including a pivotally mounted handle, a ratchet including power shaft, a chain sprocket rotatable by said shaft, a pawl carried by the handle for ratchet engagement and shaft and sprocket rotation in handle movement, a band including brake structure adapted for operative connection to the shaft and sprocket when tending to lower the load but normally inoperative upon the shaft and sprocket in load elevation, a second ratchet adapted for operative connection to the sprocket, a second pawl means normally constrained to second ratchet engagement and permitting second ratchet rotation in load elevation by the sprocket and preventing reverse sprocket rotation for lcadholding purposes, manually operable means for releasing the second mentioned pawl means from second ratchet engagement to permit reverse sprocket rotation in load lowering, and brake operating means controlled by the handle including a rockshaft, an operating arm thereon, a lever for operating said arm to release the band of said brake structure, means carried by the handle and manually controlled thereby for lever operation for brake band release when the second mentioned pawl means has been released from scond ratchet engagement to permit sprocket load lowering rotation, a centrifugally operable speed governor, and a planetary structure, the brake structure and speed governor having an operative connection to the sprocket through said planetary structure whereby the load lowering sprocket speed is multiplied for governor speed operating purposes.
14. In a chain hoist including a pivotally mounted handle, a ratchet including power shaft, a chain sprocket rotatable by said shaft, a pawl carried by the handle for ratchet engagement and shaft and sprocket rotation in handle movement, a band including brake structure adapted for operative connection to the shaft and sprocket when tending to lower the load.v
but normally inoperative upon the shaft and sprocket in load elevation, a second ratchet adapted for operative connection to the sprocket, a second pawl means normally constrained to second ratchet engagement and permitting second ratchet rotation in load elevation by the sprocket and preventing reverse sprocket rotation for load holding purposes, manually operable means for releasing the second mentioned pawl means from second ratchet engagement to permit reverse sprocket rotation in load lowering, and brake operating means controlled by the handle including a rockshaft, an operating arm thereon, a lever for operating said arm to release the band of said. brake structure, and means carried by the handle and manually controlled thereby for lever operation for brake band release when the second mentioned' pawl means has been released from second ratchet engagement to permit sprocket load lowering rotation, a centrlfugally operable speed govergear of the planetary structure and the second mentioned ratchet being rigid with each other. 15. In a chain hoist including a pivotally y mounted handle, a ratchet including power shaft,
a chain sprocket rotatable by said shaft, a pawl carried by the handle for ratchet engagement Atn and shaft and sprocket rotation in handle movement, a band including brake structure adapted for operative connection to the shaft and sprocket when tending to lower the load but normally inoperative upon the shaft and sprocket in load elevation, a second ratchet adapted for operative connection to the sprocket, a second pawl means normally constrained to second ratchet engagement and permitting secon'd ratchet rotation in load elevation by the sprocket and preventing reverse sprocket rotation for load holding purposes, manually operable means for releasing the second mentioned pawl means from second ratchet engagement to permit reverse sprocket rotation in load lowering, and brake operating means controlled by the handle including a rockshaft, an operating arm thereon, a lev'er for operating said arm to release the band of said brake structure, and means carried by the handle and manually controlled thereby for lever operation for brake band release when the second mentioned pawl means has been released from second ratchet engagement to permit sprocket load lowering rotation, a centrifugally operable speed governor, and a planetary structure including a sun gear,
` the brake structure including a drum, said brake structure and speed governor having an operative connection to the sprocket through said planetary structure whereby the load lowering sprocket speed is multiplied for governor speed operating purposes, the sun gear of the planetary structure and the drum of the brake structure being rigid with each other.
16. In a chain hoist including a plvotally mounted handle, a ratchet including power shaft, a chain sprocket rotatable by said shaft, a pawl carried by the handle for ratchet engagement and shaft and sprocket rotation in handle movement, a band including brake structure adapted for operative connection to` the shaft and sprocket when tending to lower the load but normally inoperative upon the shaft and sprocket in load elevation, a second ratchet adapted for operative connection to the sprocket,
a second pawl means normally constrained to second ratchet engagement and permitting second ratchet rotation in load elevation by the sprocket and preventing reverse sprocket rotation for load holding purposes, manually oper-- able means for releasing the second mentioned pawl means from second ratchet engagement to permit reverse sprocket rotation in load lowering, and brake operating means controlled by the handle including a rockshaft, an operating arm thereon, a lever for operating said arm-to release the band of said brake structure, means carried by the handle and manually controlled thereby for lever'operation for brake band release when the second mentioned pawl means has been released from second ratchet engagement to permit sprocket load lowering rotation, a centrifugally operable speed governor, and a planetary structure including a sun gear and a ring gear, the brake structureincluding a drum, said brake structure and speed governor 'having an operative connection to the sprocket through said planetary structure whereby the load lowering sprocket speed is multiplied for governor speed operating purposes, the ring gear of the planetary structure and the second mentioned ratchet being rigid with each other and the sun gear of the planetary structure and the drum of the brake structure being rigid with each other. f
17. In a free-chain hoist, including ra housing, a load chain depending therefrom, chain moving means within the housing including power shaft means having an end exposed exteriorly of the housing, a control mechanism operatively connected to said chain moving means for load lowering control and within the housing and including a control member projecting from the housing, a supplementary shaft means within the housing, a centrlfugally operable governor structure within the housing and operatively interposed between said supplementary shaft means and said housing for variably engaging same and governing load lowering, a planetary system within the housing ,and operatively interposed between the supplementary and the housing and with a one-way clutch connection to the latter, said system operatively connecting said power shaft means and said supplementary shaft means, a power means on the housing exposed end of the power shaft means, and housing exposed means operatively "ssoclated with the power means for directly rotating said power shaft means in a load' elevating direction, said planetary system in load lowering being effective through said governor structure for increasing the safety factor of v the hoist.
FREDRICK W. CoFFmG.