US826158A - Hoisting-engine. - Google Patents

Description

C. A'FRAZIERI PATBNTED ULY HOISTING ENGINE.

APPLICATION FILED APR.2. 1906.

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PATENTED JULY 17, 1906. C. A. PRAZIBR.

HOISTING ENGINE. APPLICATION FILED APB. 2. 1906.

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C, By

A NOR/V5 1/5 UNr'nn srarns PATENT OFFICE.

CHARLIE A. FRAZIER, OF NASHVILLE, CALIFORNIA, ASSIGNOR OF ONE- THIRD TO THOMAS J. WILSON, OF NASHVILLE, CALIFORNIA.

HOISTING-ENGINE.

Speccaton of Letters Patent.

Patented July 1 7, 1906.

T0 all whom, t 791,601/ concern.:

Be it known that I, CHARLIE A. FRAZIER, a citizen of the United States, residing at Nashville, in the county of El Dorado and State of California, have invented a new and useful Hoisting-Engine, of which the following is a specification.

This invention relates to hoisting-engines, and is primarily intended for use in connection with mines for raising and lowering the cages in the shafts thereof.

In hoisting.- engines as commonly employed at mines it is customary to have a band-brake for each drum, so as to hold one drum stationary when the other is being driven in order that a cage may be held suspended within the shaft without stopping the running of the other drum. It sometimes happens that the brake slips, becomes broken by reason of expansion and contraction due to the heat generated by friction upon the brake-pulley, or otherwise fails to act, whereupon the cage is of course dropped to the bottom of the shaft, resulting in damage to the cage and serious injury to any one who may be in or beneath the cage.

It is an important object of the present invention to obviate the objection just noted and to provide each drum with a safety-catch to positively prevent-rotation of the drum when it has been released from the drivingshaft, whereby slipping of the drum and dropping of the cage is effectually prevented.

Vith these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that changes in the form, proportion, size, and minor details may be made-within the scope of the claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings, Figure 1 is a plan view of a hoisting-engine embodying the features of the present invention. Fig. 2 is a sectional view taken on the line 2 2 of Fig. 1.

Like characters of reference designate corresponding parts in both figures of the drawm s.

gThe present engine includes a substantially horizontal drive-shaft 1, mounted in a series of bearings 2, which are supported in any suitable manner-say, for instance, upon a seriesof upstanding frame members 3, rising from a suitable bed 4. In parallelism with the drive-shaft are two independent countershafts 5, mounted in longitudinal alinement in suitable bearings '6 upon the frame members. Keyed or otherwise rigidly secured to each counter-shaft is a drum 7, provided` upon one end with a gear 8, which serves as a head, and another head 9 is provided upon the other end ofthe drum. A ratchet-wheel 1() is keyed or otherwise rigidly secured to the counter-shaft adjacent the head 9, and a brake-band pulley 11 is keyed or otherwise rigidly secured to the shaft against the outer face of the head 9.

Upon the drive-shaft there are gears 12, one for each gear 8, said gears 12 being loose upon the shaft and carrying a clutch member 13. Cooperating with the clutch member 13 is another clutch member 14, which is fixed to rotate with the shaft and is slidable thereon. By preference that portion of the shaft upon which the clutch 14 slides is made noncircular, as shown at 15, the bore of the clutch member 14 of course corresponding to the shape of the shaft portion 15, so as to prevent rotation of the clutch member upon the shaft. This assemblage of parts is preferred to a spline or feather, for the reason that wear does not tend to loosen the clutch member to such an extent as when a spline is used. The clutch member 14 is provided with an annular groove orchannel 16, which is engaged by the extremities of an upstanding fork -17, rigidly carried by a rock-bar 18, suitably mounted upon the bed beneath the drive-shaft 1 and at substantially right angles thereto. This rock-bar 18 extends below and projects beyond the adjacent drum and carries upon its rear end anupstanding lever 19, having a spring-actuated latch 2O for successive engagement with a pair of notches 21 in a segment 22, rigidly carried by the bearing 23, which supports the rear end of the rock-bar. By this arrangement the shiftable clutch member may be moved into and out of engagement with the loose clutch member 13, thereby to connect and disconnect the drum and the shaft.

The brake-band 24 embraces the brakepulley, as best shown in Fig. 2, and has its upper end connected to a link 25, which has its lower end loosely connected to the bed, as

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shown at 26, said link working through a slot 27 in the horizontal portion of the brakeband, where it extends rearwardly from the under side of the brake-pulley. A link 28 is suitably secured to the free end of the brakel band and has its rear end bifurcated, so as to straddle an upstanding lever 29, fulcrumed upon a bracket 30, rising from the bed. This lever is provided with a springeactuated latch 31 for engagement with a notched segment 32, rigidly carried by the bracket 30.

It will here be explained thatthe brakeband encircles the entire pulley and when drawn tight by manipulation of the lever 29 there is a frictional resistance throughout substantially the entire periphery of the brake-pulley without any appreciable side strain upon the shaft, which is a very important advantage over such brakes as only partially embrace the brake-pulley.

Coperating with the ratchet-wheel 10 is an upstanding dog 33, which is carried by a stub-shaft 34, mountedv in a bearing or bracket 35, carried by the bed. A leaf spring or springs 36 bear against the front side of the dog and have their lower ends suitably secured to the bed, thereby to yieldably maintain the dog in engagement with the ratchet-Wheel. A crank-arm 37- is provided upon the outer end of the stub-shaft 34, and

a connecting-rod 38 leads from the crankarm to the lower end of an upstanding lever 39, fulcrumed intermediate of its ends, as at 40, upon a brake 41, which isrigidly secured to the adjacent upstanding frame 3. This lever is rovided with a spring-pressed pivotal latcli 42 for engagement with a notch 43 in the bracket and constituting a keeper to hold the lever retracted, and thereby maintain the dog 33 out of engagement with the ratchet-wheel. When the latch 42 is released from its keeper, the spring 36 will force the dog into engagement with the ratchet-wheel.

In practice one of the drums is rotatingfor instance, the right-hand drum in Fig. 1 and the left-hand drum is out of operation by reason of the adjacent clutch 14 being out of engagement with the clutch member 13. It is necessary to hold the loose drum against rotation under the weight of the cage, which is suspended by the hoisting-cable 44. This may be accomplished by means of the brake; but, as hereinbefore indicated, this is not satisfactory, for the reason that the brake sometimes fails to work. With the present invention the rotation of the drum may be stopped by the brake, and unwinding of the drum may be effectually prevented by throwing the safety-catch 33 into engagement with the ratchet-wheel 10, whereby the drum will be.

held against unwinding even though the brake be released.

Having thus described is claimed is- 1. A hoisting-engine having a drive-shaft, a pair of independent drums, a drive connection between each drum and the drive-shaft and including a clutch, a brake for each drum, a ratchet-wheel for each drum, a dog for each ratchet-wheel, and a controller for each dog.

2. A hoisting-engine having a drive-shaft, independent drums, a drive connection between each drum and the drive-'shaft and including a clutch, a ratchet-wheel for each drum, a dog for each ratchet-wheel, a rockbar supporting the dog, a crank upon the rock-bar, and a lever connected to each crank.

3. In a hoisting-engine, the combination of a drive-shaft, a drum in substantial parallelism with the shaft, a drive connection between the shaft and the drum including a clutch, a rock-bar mounted transversely beneath the shaft and the drum, one end of the rock-bar being connected to the shiftable member of the clutch, a controlling-lever connected to the other end of the rock-bar, a ratchet-wheel for the drum, a stub-shaft mounted in substantial parallelism with the drive-shaft, a dog carried by the stub-shaft in operable relation with respect to Athe ratchet-wheel, a crank-arm upon the stubshaft, a ratchet-lever, and a connection between the ratchet-lever and the crank-arm.

In testimony that I claim the foregoing as my own I have hereto afliXed my signature in the presence of two witnesses.

CHARLIE A. FRAZIER.

the invention, what Vitnesses:

FRED C. FARMS, EDD FAGAN.

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