US544041A

US544041A - Hoisting mechanism

Info

Publication number: US544041A
Authority: US
Publication date: 1895-08-06
Anticipated expiration: 1912-08-06

Description

(No Model.) 2 Sheets-Sheet 1.

G. F. JENNINGS. HOISTING MECHANISM.

No. 544,041. I Patented Aug. 6, 1895.

(No Model.) 2 ShetsSheet 2.

G. P. JENNINGS.

HOISTING MECHANISM. No. 544,041. Patented Aug; 6, 1895.

WITNESEE UNITED STATES PATENT OFF 101:.

GEORGE F. JENNINGS, OF FALL RIVER, MASSACHUSETTS.

HOISTING' MECHANISM.

$PIECIFIGATION forming part of Letters Patent No. 544,041,"da.ted August 6, 1895.

Application filed March 24, 1894.

To aZZ whom it may concern.-

Be it known that I, GEORGE F. JENNINGs, of Fall River, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Hoisting Mechanism; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference to improvements in hoisting mechanism adapted for use on an inclined stay. 4

The object of the invention is to so construct the trolley-carriage of a hoisting-machine that an increased friction may be exerted on the hoisting-cable during the traverse of the carriage along the inclined stay.

Another object of the invention is to so construct a trolley-carriage that the pulley for the hoisting-cable may be automatically locked against rotation and unlocked.

Another object of the invention is toprovide a new and improved lever chock-stop for hoisting mechanisms.

The invention consists in the peculiar construction of the trolley-carriage and the combination therewith of the cable-pulley and means for locking the same.

The invention also consists in the novel construction of the chookstop adjustable on the stay.

The invention also consists in the peculiar means for releasing the trolley-carriage from the chock-stop and for automatically locking and unlocking the cable-pulley. Figure 1 represents a view of an incline stay with the trolley-carriage engaged by the novel chock-stop at the commencement of the hoist. Fig. 2 represents a view of the same parts, the trolley-carriage having commenced its upward traverse. Fig. 3 represents Views of the lifting-lever removed from the chockstop and of the locking device removed from the trolley-carriage. Fig. 4 represents a vertical sectional view. of the cable-pulley with portions of the carriage. Fig. 5 represents a side elevation of a framework, partially broken away, on which the hoisting mechanism is designed to be operated, showing the arrangement of the hoisting-cables and of the Serial No. 504,991. on model.)

lines for adjusting and holding the chockstop. Fig. 6 represents a vertical sectional view of one form of digger-tub designed to be operated with this system.

Similar numbers of reference designate corresponding parts throughout. 7

This hoisting mechanism is designed for use on a device similar to that described and claimed in United States Letters Patent No. 508,171, issued to the undersigned on November 7, 1893, in which a trolley-carriage traverses alongv an inclined stay and to which reference is made as showing the means for supporting the ends of the stay, this present device being adapted for use when a digger-tub is used or where the hoisting-cable is attached to the tub and passes directly from the same over the pulley for this cable j ournaled in the trolley-carriage, in order that when the trolley-carriage is released from the chock-stop the hoisting-cable pulley will retard the backward movement of the hoisting-cable to prevent the driving of the carriage up the inclined stay, while the weighted tub will descend before it reaches the point for unloadmg.

In the drawings, 5 indicates the inclined stay, which is secured at its upper and lower portions by any of the usual devices, for which reference is made to the abovementioned patcut, and to the description of one form hereing portions of the supporting device.

Movably mounted on the stay 5 isithe chockstop 8, the location of which on the stay is adjusted by means of the hand-

lines

9 and 10, a pair of which is generally used for each side of the stop. The stop 8 is tubular, the stay 5 passing therethrough,having the shoulder 11 to stop the trolley-carriage and the depending balancing-weight 12. Below the shoulder are cars 13, to which the forked lifting-lever 14 is pivoted. At the forward end of this lever is the finger 15, which bears against the lower surface of the stop 8 and limits the downward movement of the lever. Extending from the lower portion of the stop 8 below the stay 5 is the plate 16, to the upper end of which is the stay 5. On the upper member 20 isa check 21.

Mounted on the stay 5 is the trolley-carriage 22, having the grooved wheels 23 23, which travel on the stay. The frame of this carriage extends below the stay and has a lower bearing-block 24, which, when the carriage is at its lowest traverse, bears on the lever 14. Journaled in the lower portion of the carriage-frame are the cable-

pulleys

25 and 26, the pulley 25 generally carryinga cable 27 for actuating the mechanism of the hoisting-tub. The pulley 26 has a V-shaped groove in its face to receive the hoisting-cable 28 and to afford a considerable bearingsurface on this cable. 0n the side of this pulley is formed the ratchet 20.

Pivoted to the frame 22 is the pawl-lever 30, having the cross-bar 31 at the lower end, the pawl 32, adapted to engage the ratchet of the pulley 26 when the pawl-lever is thrown forward, and the curving arm 33, extending nearly to the stay.

This improved hoisting mechanism is designed to be supported by a framework similar to that illustrated in Fig. 5 and described in the above-mentioned patent, the lines 10, for drawing the chock-stop .upward, passing upward at slight angles from the inclined stay 5 to pulleys secured to the upper portions of the framework and thence downward to securing devices located in convenient positions. The lines 9, for exerting a down haul on the chock-stop, pass over pulleys at the outer end of the boom and are then brought inward to convenient points for securing the same.

To the end of the hoisting-cable 28 is socured any desired form of tub or vessel,having a cross arm or block 34 at its upper end or on one of its hoisting-chains. This vessel generally consists of what is known as a digger-tub, which is designed to be opened by the holding of the cable 27 and the release of the cable 28, while it is closed and raised by the drawing in of the cable 28, the cable 27 being taken in simultaneously. One form of this tub is illustrated in Fig. 6 of the drawings. The carriage 22 being at its lowest pointof traverse, resting against the shoulder 11 of the chock-stop, the hoisting-cable 28 is drawn in, the tub ascending, the weight of the tub being on the cable 28. The carriage first moves upward until the front wheel of the carriage rests in the curved stop 18 and the end of the arm 33 is removed from the check 21. When the tub is hoisted sufficiently the cross-bar 34 will engage the forked end of the lifting-lever 14, and the free end of this lover will be lifted, striking the crossbar 31 of the pawl-lever and throwing this lever forward, thus engaging-the pawl 32 with the ratchet of the wheel 26. A further upward movement of the hoisting-cable will still raise the lifting-lever, which, bearing on the block 24 of the carriage, will raise the forward end thereof until the front wheel is raised over the curved step 18 and the carriage starts upward.

' When the tub is emptied the cables are slacked and the carriage runs down the stay until it strikes the chock-stop. At the same time the curved end 33 of the pawllever 30, striking the check 21, is thrown back, disengaging the pawl 32 from the ratchet 29 and allowing the pulley 26 to rotate.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. In a hoisting-mechanism, the combination with an inclined stay, and a carriage having wheels movable thereon, of a checkstop adjustable on the stay and provided with a shoulder for intercepting the carriage, a step to prevent the undue upward movement of the carriage, an inclined way extending upwardly from said step and means for adj usting the choclnstop.

2. In a hoisting-mechanism, the combination with an inclined stay, a carriage having wheels traveling thereon, and a step for preventing the undue-upward movement of the carriage by engaging one of its wheels, of a lever pivoted to a support and adapted to lift the carriage outof engagement with the step when raised, as described.

3. In a hoisting-mechanism, the combination with an inclined stay, a carriage having wheels mounted on the stay, a hoisting-cable pulley jonrnaled in said carriage and having a V-shaped groove, means for locking said pulley against rotation, a hoisting cable passing over said pulley, and a cross arm at the lower end of the cable, of a chock-stop having a bearing to intercept the carriage, a step for preventing the nndue upward movement of the carriage, and a lever pivoted to the chockstop adapted to be engaged by the cross arm on the cable and to lift the carriage out of engagement with said check.

4. The combination with the inclined stay 5, means for supporting the samein position, the chock-stop 8 mounted on said stay having the shoulder 11 and weight 12 and provided with the way 17, the step 18 and the check 21, the forked lever 14 pivoted to the stop, and the

cables

9 and 10 for adjusting the location of the stop, of the carriage 22, the wheels 2323 of which are mounted on the stay, the pulley 26 having a V-shaped groove, and the ratchet 29 journaled in said carriage, the pawl-lever 30 having the cross-bar 31, the pawl 32 and the end 33 pivoted to the frame of the carriage, the hoisting cable 28 passing over said pulley 26, and the cross-bar 84 on'the end of said cable.

5. The combination with an inclined stay, In witness whereof I have hereunto set my of the tubular chock-stop 8 mounted on the hand. stay and having the shoulder 11 and weight w T 12 and provided with the way 17, the step 18 GEORGE JENNNGS' 5 and the check 21, and a lifting-lever pivoted Witnesses: to the chock-stop, as and for the purpose de- HENRY J. MILLER,

- M. F. BLIGH.

scribed.