US2357462A

US2357462A - Boom hoist

Info

Publication number: US2357462A
Application number: US411005A
Authority: US
Inventors: Berlin S Ferguson
Original assignee: BYERS MACHINE Co
Current assignee: BYERS MACHINE Co
Priority date: 1941-09-16
Filing date: 1941-09-16
Publication date: 1944-09-05
Anticipated expiration: 1961-09-05

Description

Sept. 5, 1944. B. s. FERGUSON 300M HOISI Filed Sept. 16, 1941 2 Sheets-Sheet 1 m .m 0 Tm W% in a w L Arron/vs:

p 1944. B. s. FERGUSON 2,357,462

BOOM HOIST Filed Sept. 16, 1941 2 Sheets-Sheet 2 /NVENTOR: BER IN S. FERGUSON ATTORNEY Patented -Sept. 5,1944 I i 2 ,357,462 BOOM nors'r Berlin S. Ferguson, Bavenna, Ohio, assignor to Byers Machine Company, RaVennafOhio, a corporation of Ohio Application September-16, 1941, Serial No. 411,005 7 Claims; (01. 254187) UNITED STATES PATENT orrlcs 4 In material-handling equipment of the type and such location does not require any additional to which power shovels belong the main boom gearing. is generally riggedfor raising and lowering by These and other advantages will be apparent a compound line running over a series of sheaves to those skilled in the art from the description and wound upon oneof the smaller drums of 5 and illustrations which accompany the descripthe, mechanism. Such machinery includes shovtion.

els, drag-line scrapers, certain sorts of cranes, It will be understood that I have shown and and like mechanism. Often the working ar- I described herein a preferred form of the invenrangements are interchangeable, so that one tion, but that the principles thereof y b e machine can be used for all the purposes named P y With fi e w detailby changing the attachments. One characterisn t e a o p ny dr w s:

tic of such machines is that the power plant Fig. 1 is a central axial vertical section of the and operative gearin must be placed in a small mechanism, certain pa s bein S ow n elev space, and that there must be several drums tion; transverse to the assembly so that the numerous 2 is a transverse Section indicated by line cables can be led as directly as possible. This -2 of Fig. 1, lookin in t e direct on 0f the need gives rise to the further requirement that arrows; and e the principal shaft be transversely disposed, Fig. 3 is an end elevation indicated by the and that such shafts carry more than one drum. line 33 of Fig. 1, looking in the direction of The wear on all parts of the mechanism is the arrows.

severe, which gives rise to the need of adequate The entire mechanism is carried upo Shaft areas for wearing parts in spite of the strict ll mounted in appropriate bearings l2, l3 at its limitations of space. This also makes it necesopp s e ds. this shaft bein preferably of sary to provide ample facilities forlubrication, ferent diameters, in steps decr in fr m h .but again the necessity to gather the machinery middle towards each end, so that the various into close quarters makes it diflicult to get at Parts a ed t y y e e y assembled the parts for oiling and greasing. thereon and removed therefrom.

Since failure of the boom hoist'would allow Beginning for convenience at the left end of the boom to fall, it has been a common practice the shaft II as Seen n t a t (1 to give the boom hoist drum an irreversible 3o p s s u iv ly a u al in the beari drive, not relying, on brakes to hold it against preferably provided with washers IE to take leftrunning out. Consequently a worm drive is used ward end thrust; a large driving gear l5 keyed for the purpose, but since the worm shaft is at Otherwise Suitably s u d p the a right angles to the worm wheel, such a drive roller bearing l6; heavy threads I! upon the cenrequires bevel 'or other right angle change of tml Portion of the Shaft; another roller bearing direction in the gear train from the principal 3; a f i n d brake disk keyed Othershaftin to the worm wheel, or else places the wise suitably f both axially a d c cu fe enboom hoist drum axis lengthwise instead of tially 0n t e s and fl el ya journal in the crosswise, necessitating carrying the line around bearing l3. The th e ed ction is pr fer bly a leader pulley. 40 integral with the shaft H, although it could be My invention is'for the purpose of providing Separately made a keyed 0 Ot erwise fixed a boom hoist retaining the advantages of a Worm p the tdrive while avoiding its disadvantages, thus af- A boom hoist drum 20 is carried in the manfording a compact assembly, fitting in with the ner of a nut upon the threads H, the drum beusual arrangements of the machinery, giving ing CorreSpOndinglY internally t ead d- T s large bearing and holding surfaces, not dependdrum 20 is supported on the shaft II by the ent upon a separate brake for its holding action, roller bearings l6 and I8 recessed in the respeccapable of lowering the boom only by driving tive ends of the drum. Both bearings, as shown the hoisting shaft in the opposite direction, with in Fig- 1, allow axial movement of the drum.

the bearin surfaces all constantly lubricative 5 The right flange 2| of the drum is inset from and easily accessible for renewal of the lubrithe end, le ving a Shank 22 to which a friction cant. all parts so arranged that repairs can be ring 23 i5 Suitably fastened, relatively movable readily made when necessary. These features axially but not radially as y a key The are combined with a transverse location of the brake disk H has an inwardlye t s drum, conforming to that of the other drums, -verse face 25 positioned opposite the friction i k 23 but spaced therefrom. The face 25, ring, 23'

and flange 2| are all of about the same size and shape to receive sandwiched between them the

inner webs

26 and 21 of two ratchet wheels 23 and 23. The brake disk 13 also includes a; rim 30 surrounded by a band brake 3| of conventional' type, applied by a spring 32 and released by a cam 33.

-The ratchet wheels 28 and 2a are alike. Their rims are enlarged outside their

webs

26, 21 to ride on the peripheries of the members 2i, 23 and I3, and free rotation is possible except when axial movement of the drum '20 clamps the parts.

The twowheels areheld for rotation together,

. and their ratchet teeth are kept in alignment,'

' by studs 34, which allow axial movement.

necessary the studs may be secured to one of applied at the left end by a filling hole 40 through V the rim of the left flange ofdrum 23 and at the right end by a filling hole 4| through the hub of brake disk l9. It will be observed that both filling holes are always accessible; 40 cannot be blocked by a line wound on the drum. In this way both ends of the mechanism can be lubricated and'kept full of lubricant,- which will work into the threads l1.

The operation of the mechanism will now be described, it being understood that the hoist line 42 is secured to the drum, for example by clamp 43, and that turning the drum counterclockwise as seen in Fig. 2 winds up the line to hoist the boom, while the unwinding movement is clockwise.

The operation is that when the shaft I l is stationary, gravity pull on the line 42 by weight of the boom starts an unwinding action, turning the drum 2B clockwise as seen in Fig. 2. The shaft ll cannot move axially, consequently the drum 20, acting as a rotating nut on a stationary bolt, moves to the right until elements 2!, 26,13, 21 and 25 are all frictionally clamped together, after which further unwinding is prevented by the pawl 35 holding the ratchets. Normally the shaft ii is held stationary by its driving gear i5 and the train of driving mechanism, but the brake 3| is added as an extra precaution.

To pay out the line 42 to lower the boom it is necessary to drive the shaft I i clockwise as shown sive momentary checks will not occur.

To hoist, the shaft is driven counterclockwise, the drum at first acting as a nut in tightening the friction system, and thereafter driving and clicking the ratchets over the pawl 35.

The foregoing description (with the drawings) of a preferred embodiment of my invention shows aform suitable for the boom hoist of a medium V movement of parts, and other factors, as will be apparent to those skilled in the art. quently itwill be understood that the foregoing Consedescription and accompanying drawings are by way of illustration rather than of limitation, and that the invention is susceptible of modification in its details, all within the scope of the claims.

, I claim: Y

1.. A boom hoistmechanism comprising, a driving element operably associated with said shaft, a drum on said shaft, 9. hoist line wound on said drum, said line being secured to said drum, bearings between said drum and said shaft at opposite ends of said drumythreads connecting said drum'and said shaftintermediate said bearings, and a disk fast axially and circumferentially on said shaft, releasable means for restraining rotation of said'disk, a friction flange on one end of said drum, a friction'ring on the same end of said drum as said flange movable axially but fast circumferentially with respect to said drum, a friction wheel rotatably mounted between said flange and said ring, another friction wheel rotatably mounted between said ring and said disk, ratchets on said friction wheels, and a pawl engaging said ratchets, the relative direction of said threads being such that turning said drum relatively to said shaft in the direction against said pawl moves said friction elements together, while turning said shaft relatively to said drum in the direction against said pawl moves said faces away from said disk.

2. A boom hoist mechanism for a materialhandling machine comprising in combination a shaft, a drum threaded thereon for limited independent endwise movement thereon, bearings between said drum and said shaft at opposite ends of said .drum upon which the drum rotates and slides, and oil seals between said drum and said shaft disposed outwardly of said bearings, said drum being internally oil-tight whereby said seals and the interior ofsaid drum define an oil chamber containing said threads and said bearings.

3. A boom hoist mechanism for a materialhandling machine comprising in combination a haft, a drum threaded thereon for limited indep dent endwise movement thereon, bearings between said drum and said shaft at opposite ends of said drum upon which the drum rotates and slides, oil seals between said drum and said shaft disposed outwardly of said bearings, said drum being internally oil-tight whereby said seals and the interior of said drum define an oil chamber containing said threads and said bearings; and lubricant supply passages opening into opposite ends of said chamber.

4. In a boom hoist mechanism of the character described, a shaft having a screw threaded portion and bearing portions at opposite ends of the threaded portion, a drum having an axial bore internally threaded to screw on th threaded portion of the shaft and counterbores at opposite ends thereof, and anti-friction bearings for the drum mounted within the said counterbores, said drum being slidable axially on said bearings and said bearings being held against axial movement on the shaft.

5. In a boom hoist mechanism of the character described, a shaft having a screw threaded portion and bearing portions at opposite ends of the threaded portion, a drum having an axial bore internally threaded to screw on the threaded portion of the shaft and counterbores at opposite ends thereof, and a roller hearing within each counterbore, each roller bearing having an outer race ring fitting in the counterbore and an inner race ring fitting upon a bearing portion of the shaft, said inner race ring being secured against axial movement on said shaft and saidouter race ring being axially movable with respect to the inner race ring.

6. In a boom hoist mechanism, a shaft having an enlarged central portion provided with a screw thread, supportsin which said shaft is journaled, a winding drum having an axial bore provided with an internal thread engageable with the screw thread on the shaft, said drum having counterbores in its opposite ends, an antifriction bearing interposed between the drum and shaft in each of said counterbores, a gear fixed to the shaft adjacent one endof the. drum and having a hub projecting into the adjacent drum counterbore, a friction disk fixed to the shaft adjacent the opposite end of the drum and having a hub projecting into the adjacent drum counterbore, sealing rings interposed between the end of the drum and said hubs, a friction wheel interposed between the drum and disk,

and means for restraining the rotation of said friction wheel.

' and oil sealing rings interposed between the drum and shaft within said counterbores and outwardly of said hearings to retain lubricant in the space within the drum in which the screw threads and bearings are located.

BERLIN S. FERGUSON.