US833994A - Hoisting apparatus. - Google Patents

Description

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.... O o ma Vply the brake`- The invention consists of the parts and the WILLIAMS. BRADS'HAW, oF SAN JOSE, CALIFORNIA.

HolsTlNG APPARATUS.

Specification of `Letters Patent.

Patented Oct. 23, 1906.

Application mea .Imm-y 1o, 190e. lsum1 No. 296.746.

To all whom it may concern:

Be it known that I, WILLIAM S. BRAD- SHAW, a citizen of the United States, residing Its object is to provide a simple ractical gasolene-hoist especially for use-in: uilding construction for hoistmg mortar and the like, but capable of general application, wherein a single lever will operate to run the hoisting-drum in either direction and also apconstruction and combination of parts, as

. hereinafter more fully described and claimed,

' my Improved having reference to the accompanying draw- .Ings, in which- Figure 1 is a lan view, in partial section, of oist. Fig. 2 isa side elevation of the same.

A represents a drive-shaft receiving constant motion in one directionfromy any suitable source of power. In practice I employ a gasolene-engine; but I may use steam, elec-- trlc, or water power. This-shaft is journaled in the fixed blocks 2.

3 represents a drum having its shaft turning in the eccentrics 4, which are turnable in the bearings 5. lOne end of the drum or l lixed grooved drum-shaft carries the annular flange or rim 6, having the internal friction-grooves 7. The opposite end ofthe drum-shaft carries the ulley 8.

The drive-SE yft A carries the corresponding grooved pulleys 9 10, which t0 engage, respectively, the internal grooves 7 and pulley 8, according as the eccentrics 4 are rocked in their bearings 5 to carry the drumshaft toward or away from the drive-shaft A.

The mounting 0i the drum and its movement relative to Shaft A and the Sizes of the prulleys 9 10 relative to their complementary iction-surfaces 7 8 are such that the drum may be engaged with one of the pulleys 9 10 to drive the drum, in one direction and with tho other of said pulleys to drive the drum in the reverse direction, or the drum may be thrown into intermediate position, leaving it to be entirely supported against rotation or to have its movements controlled independent of the connections with the drivelshaft lA by suitable brake mechanism hereinafter are adapted to be explained. The relative sizes lof the pulleys 9 10 and their complementary fric, .tion members 7 8 may be varied to run the hoist at any desired speed in either direction.

The rocking of the eccentrics 4 in unison to carry the drum into or out of operative conneet-ion with the pulleys 9 10 may be accomplished by any suitable means. In the, present instance I have shown each eccentric as having an operating-lever 11 fast to it, so that the hoistV may be manipulated from either side. Each lever 11 connects by a link 12 with a respective arm 13 on a rockshaft 14, wherebyl the operation of one lever acts through the several connections to move bot-l1' ends of the drum simultaneously and in unison.

Since both levers 11 perform the same function exact-ly as an operating-lever, they may be considered as one, since it is 'the use of a single lever to perform several functions that constitutes a main feature of my invention.

The levers 1 1- may be locked in any desired position by suitable means, as the pawl-andrack mechanism 15. With a lever 11 thrown to its limit of `movement in one direction, as indicated in Fig. 2, the internal grooves 7 will be brou ht into operative engagement with the pulay 9 to run the drum one Way. With the lever 11 thrown to its limit of movement in the other direction the pulleys 8 10 would be in operative en agement and the rotative movement of the rum would be reversed. With the lever in intermediate position the drum and shaft A would be in relatively inoperative position.

An Suitable' form of brake mechanism may e employed to control the movements have here shown a simple form of brake, and I prefer to operate the brake by and cordinately with the movements of one or the" other of the levers -11. prises a b'ar 16, `fulcrumed, as shown at 17, and provided with a brake-shoe 18 to engage the periphery of the rim 6 of the drum. A spring 19 acts on the o posi-te end of the brake-bar 16 to throw the brake normally on, the tension-spring 19 and the relative lengths of the portions of the bar on each side of fulcrum 17 being proportioned to the load, so as to insure a erfect control of the hoist by the brake. O viously I mi ht employ supplementary or emergency rakes;

of the drum independentof the shaft A. 'I 95 but in practice I have vfound :that fer certain classes of work the brake herein shown and described is sufficient for all purposes. The

end of the brake-bar opposite the shoe is supported in suitable guides 20.

The brake-bar is operated cordinately with an operating-lever 11 by means of two pivoted links 21 22, one of which is adjustably pivoted, as at 23, to an arm 13 adjacent to the outer end of the bar. The other link is adjustablyivted at 24 to a corresponding downward y-extending arm 25 rigid with,

drum is disconnected from shaft A then the' bar 16 will stand in the angle between the links 21 22` and'free from engagement with the links,- so that the full force of s ring 19 may.. act to. put on the brake and old the drum. fA limited movement of the operating-lever is permitted to let up on the brake and allow the drum to turn by reason of the weight of its load, but still not throw the drum into connection with either of pulleys 9 10. In other words, the links 21 22 operate after the manner of cams or wedges to draw in on the bar to release the brake when the operating-lever is rocked in either direction from a neutral position.

The adustable connections 23 24 vof the respective links 21 22 admit of necessary take-up, as wear occurs on the brake on any of its parts.

Having thus described my invention, what I claim, and desire `to secure by Letters Patent, is-

1. In hoisting apparatus, the combination of a drum having a lurality of frictional surfaces, a drivehaft having a lurality of frictional surfaces, and means or shifting the drum relative to the shaft whereby one of the frictional surfaces thereof will enga e one of the frictional surfaces of the driveaft and the other frictional surface of the-drum will simultaneously'disengage the like surface of the shaft.

2. In hoisting apparatus, the combination of a drum having mdependent frictional surfaces, a drive-shaft 'having independent frictional surfaces, means for shifting the drum .relative to the shaft to cause one ofthe frictional surfaces thereof to engage a companion surface on the shaft, and to cause the other frictional surface to disen age a companion surface on the shaft where y the drum may be driven ineither direction, a brake, and a single lever controlling the brake and also controlling the' movements of the drum in either direction.

3. In a hoist, the combination of a driveshaft ha.'A g two friction-pulleys, a drum having avffic'tion-surface to engage one side of one pulley to turn the drum in one direction, and having a second friction-surface to engage the opposite side of the other pulley to operate the drum in a reverse direction, and means for moving the drum relative to the shaft to engage one or the other of said pulleys.

4. In a hoist, the combination of `a driveshaft having two friction-pulleys, -a drum having a friction-surface to engage one side` of one pulley to turn the drum in one-direc'- tion and having a second friction-surface to engage the opposite side of the other pulley to operate the drum in a reverse direction,

means for moving the drum relative to the shaft to engage one or the other of said pulleys, a brake which is normally on, and means to operate the brake synchronously with the movements of the drum into and out of engagement with said pulle s.

5. In a hoist, the combination of adriveshaft having two friction-pulleys, a drum having a friction-surface to engage one side of one 'pulley to turn the drum .-inone'direction and having a second friction-surface to engage the opposite side of the other pulley to operate the drum in a reverse direction, means for moving ythe drum relative to the shaft toen age one or the other of said pulleys, a bra e,'and connections between the brake and drum to operate .the brake cordinately with the engagement of the drum with one or the other of said pulleys.

, 6. In a hoist, the combination of a driveshaft having two friction-pulleys, a drum having a friction-surface to engage one side of one pulley to turn the drum in one direction and having asecond friction-surface to engage the opposite/side of the other pulley IOO to operate the drum in the opposite direction,

means including an operating-lever for mving the drum relative to the shaft to engage one or the other of said pulle s, a brake, and connections between thebra e and vsaid eperating-lever to actuate the] brake cor nately withl the movements of said lever.

7. In a-hoist, the combination of a driveshaft having constant motion in one-direction, a drum mounted parallel to the shaft, said shaft and drum havin .coacting pairs of friction-pulleys, means inc udin an operatin -lever for moving a member` o each air of pu eys toward or from the other mem er of the same air to operate the drum, drive connections Ibetween the shaft vand `drum to drive the latter in either direction, a-brake, and connections between the brake and said lever.

8. In a hoist, the combination of a. -drivelIo shaft, friction-pulleys thereon, al drum having internal and external friction-surfaces correspondin with said drive-pulleys, eccentrics in whii the shaft of said drum are journaled, and means for operating said eccentrics to move the drum into enga ement with one or the other of said drive-pu eys.

9. The combination ofv a drive-shar't,l a counter shaft, eccentric turnable bearings for the counter-shaft, friction-pulleys on the drive shaft, said counter-shaft supporting internal and external frictional surfaces corresponding with saidy drive-pulleys, connections between said eccentrics and an operating-lever for-turnin said eccentrics to carry one or' the other o said rictional surfaces into en agement'with the corresponding friction-pu ley to operate the drum in one direction or the other.

10. The combination. of a drive-shaft, a counter-shaft, eccentric turnable bearings for the counter-shaft, friction-pulleys on the drive shaft, said counter-shaft supporting internal and external frictional surfaces corresponding with said drive-pulleys, conneci prevent the rotation of said counter-shaft, and means to operate the brake synchronously with the movement of said eccentrics. 11. The combination of a drive-shaft, a counter-shaft, eccentric turnable bearings for the counter-shaft, friction-pulleys on the drive-shaft, said counter-shaft supporting internal and external frictional surfaces corresponding with said drive-pulleys, connections between said eccentrics, an operatinglever for turning said eccentrics to carry one or the other of said frictional surfaces into engagement with a corresponding pulley to operate the drum in one directlon, or the other, a brake normally applied to'. prevent rotation of said counter-shaft, and connections between the brake and said operatinglever to release the brake.

and external frictional surfaces, correspondage said ing friction-pulleys on the drive-shaft to eni gage said friction-surfaces to operatev the rum in either direction. v

13'. The combination of a'drive-shaft, a counter-shaft parallel therewith, means for moving one of said shafts toward or from the other, said counter-shaft carrying internal and external frictional surfaces, corresponding frictionulleys on the drive-shaft to en rum in either direction, a brake normally a' plied to prevent rotation of the counterslliaft, and connections between the brake and that shaft which has a to-and-ro movement relative to the other shaft, vto operate the brake. 14. In a hoist, the combination of a driveshaft, friction-pulleys thereon',` a drum, rotatable eccentrlc members inwhich the drumsl'iaft is journaled for rotation, said drum car- 'rying internal and external frictional surfaces correspondingv with the pulle son the iction-surfaces to operate thedrive-shaft, connections between t e eccenn tric members, an operating-lever for turning said members to carry the drum into engagement with one or the other of the drive-pulleys, a brake, and articulated connectlons between the brake and lever to actuate the brake.

15. In a hoist, the combination of a driveshaft, friction-pulleys thereon, a drum, ro-

tatable eccentric members in which the drumshaft is journaled for rotation, said drum car-- rying internal and external frictional surfaces corresponding with the pulle s on the drive-shaft, connections between t e eccentric members, an operating-lever for turning said members to. carry the drum into enga'gement with one or the other of the drive-pulleys, a spring-actuated brake normally applied to revent rotation of the drum, and adjustab e articulated connections between the brake and said lever for releasin the'v brake on the operative engagement o the .A

drum with one` or the other of said drivepulleys.

In testimonyl whereof I have hereunto set my hand in presence of two subscribing Witnesses.

WILLIAM s. BRADsHAw.

Witnesses:

W. H. CHRISTMAS, H. T. KELLEY.

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