US734309A - Equalizing-draft hoisting-gear. - Google Patents

Description

PATENTED JULY 21, 1903'.v J. G. DBLANEY. AEQUALIZING DRAFT HOISTING GEAR.

APPLICATION IILED MAY 24, 1902.

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UNITED STATES Iatented .Iuly21, 1903 I JAMES GRANT DELANEY, OF NEW YORK, Y.

' EQUALIZING-DRAFT HOISTING-G EAR.

SPECIFICATION forming part of Letters Patent No. 734,3b9, dated July 21, 1903.

Application filed May 24, 1902.

of the city of New York,'borough of Manhattan, in the county and State of New York, have invented new and useful Improvements in Equalizing-Draft Hoisting-Gears, of which the following is a full, clear, and exact description.

My invention relates to a hoisting-gear, my object being more particularly to produce a neat, simple, and efficient means for rendering the load substantially equal when the device is actuated in connection with a hoisting-bucket whether the bucket is loaded or empty.

Reference is to be had to the accompanying drawings, forming a part of this specification,

. in which similar characters of reference indicate corresponding parts in allthe figures.

Figure 1 is a side elevation showing my invention as applied to an ordinary aerial hoisting apparatus. Fig. 2 is a plan View of the same; and Fig. 3 is a fragmentary section, slightly enlarged, of one of the drums used with my device.

Mounted adjacent to a frame 1 is an engine 2, controlled by a throttle 3, reversing-lever 4, and link-motion 4 in the usual manner. A cylindrical drum 5 is provided circumferentially with an annular channel of the shape indicatedin Fig. 2, said drum being secured rigidly to a gear-Wheel 6, operated by a pinion 7. Another drum 8, somewhat similar to the drum 5, but not provided with a gear- Wheel, is formed with a friction-surface 8 to be engaged by a brake-band 9 when the latter is pressed by the brake-leverlO. The two drums are connected by means of a frictionclutch 10, as is sometimes done in other hoisting-engines, and the clutch is operated by means of a crank 11 in the usual manner. A

bucket 12, preferably of the type known as the Hayward bucket, is provided with a sprocket-chain 14., a bull-wheel 13, and a guide-pulley 15 in the usual manner. The hoist-lines 16 17 may be of rope, as indicated in Fig. 1, or of chain, as indicated at 17 in Fig. 3. If rope lines are used, they are coiled a few times entirely around the drums, as indicated in Fig. 2. If chain hoist-lines 17 are used, they make a single loop around the $erial No. 108,823. (No model.)

drum 8*, as indicated in Fig. 3, not entirely surrounding the drum;

The hoist-lines engage the guide-pulleys 18 18 of the trolley 19, which runs upon the track 20 in the usual manner. The hoistlines may be supported by the guide-pulleys 21 22 23 23 24. 25, if'desired. The blocks 26 27 are provided with guide-pulleys28for the purpose of supporting the two weights 29. The weights should be heavier than the bucket'12 when empty and lighter than the bucket when loaded. The object is to make the draft upon the engine substantially equal when the bucket is being hoisted with a load 7 or when it is being lowered empty. In this way the engine need only have half the power otherwise required for'the reason that the engine is at Work practically all of the time, Whereas otherwise the engine would be idle about one-half of the time in which the bucket is in'motion.

I am aware that devices have heretofore been invented for the purpose of equalizing the draft upon the engine. In such devices, however, there have invariably been some 0bjectionable features-such, for instance, as a hoist-line winding uponitself, thereby virtually varying the torque of the drum, which has in some instances been compensated by means of a fusee or a special cam for the purpose. Some of the inventions referred to cause the hoistlines to be cumulatively wound on the drum',thus necessitating a waste of time in unwinding. over, all such complications are avoided.

By my device, how- The hoist-lines,whether-they be rope or chain,

are fed into the drum upon one side thereof and paid out by the drum on the other side thereof. The speed of thehoisting-line is'always commensurate with the speed of the drum, and the leverage exerted by the drums and the consequent strain upon the hoist-line are substantially equal at all times for a given load.

The operation ofmy device will-be readily understood from the foregoing description. When the operative desires to close the bucket 12 and to raise the same, he merely loosens the friction-clutch 10, starts up the engine,

and then tightens the clutch. This causes the engine to rotate the drum 5 with a positive motion, the drum 8 not starting until a moment later. During this moment the hoistline 16, which passes over to the left of the bull-wheel 13 of the bucket 12, causes the bull-wheel to roll upward in the position indicated by the dotted lines in Fig. 1, thereby closing the bucket, and soon as the bucket is closed both drums operate upon the hoistlines and the bucket is raised. The engine may be reversed by again loosening the friction-clutch and applying the brake slightly and then tightening the clutch. The hoistline 16 is propelled slightly in advance of the hoist-line 17, and thereby slackened, so that the bull-wheel descends when the bucket is empty.

The structure and operation of the Hayward bucket, as above described, and also the structure and operation of the hoistingengine are old in the art andneed no detailed description.

My invention relates more particularly to the type of drums and the manner in which the hoist-lines are wound thereon, together with the bucket and its counterweights.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. An equalizing-draft hoisting-gear, comprising revoluble drums mounted upon bearings, hoist-lines connected with said drums, pulleys disposed adjacent to said drums and located higher than the same, said hoist-lines engaging said pulleys, a bucket and means forcounterbalancing the same con nectedwith said hoist-lines in such manner as to partially support the weight of said drums, thereby partially relieving said bearings.

2. An equalizing-draft hoisting-gear, comprising a plurality of revoluble drums, a separate hoist-line engaging each of said drums in such manner as to be simultaneously wound thereon and unwound therefrom, the arrangement being such as to distribute the friction of the hoist-lines upon said plurality of drums, a bucket connected with both of said hoistlines,separate counterweights connected with said hoist-lines, said counterweights together being lighter than said bucket, when loaded, and heavier than said bucket when empty, and pulleys for sustaining said hoist-lines.

3. An equalizing-draft hoisting-gear, comprising a pair of revoluble drums mounted upon bearings, a pair of hoist-lines connected with said drums, pulley mechanism disposed adjacent to said drum and located higher than the same, said hoist-lines engaging said pulley mechanism, a bucket connected with both of said hoist-lines, and separate counterweights connected with each of said hoist-lines in such manner as to partially support the weight of said drums, thereby partially relieving said bearings.

4. An equalizing-draft hoistingear, comprising a pair of revoluble drums, longitudinal hoist-lines partially wound intermediate of their ends upon said drums, the arrangement being such that the rotation of each of said centric with the axes of said drums, hoists lines engaging said channels and free to wind thereon and to unwind therefrom at the same rate of speed, a bucket connected with said hoist-lines, counterweights for said bucket, said counterweights being connected with said hoist-lines and together being lighter than said bucket when loaded and heavier than the same when empty, and means for actuating said drum.

6. An equalizing-draft hoisting-gear, comprising a plurality of revoluble drums, hoistlines separately engaging said drums and so disposed that the rotation of said drums causes said hoist-lines to wind thereon and unwind therefrom at the same rate of speed, a bucket, counterweights connected with different portions of said hoist-lines, a reversible engine connected with one of said drums, a brake connected with the remaining drum, and clutch mechanism for connecting said drums together and disconnecting the same at will.

7. An equalizing-draft hoisting-gear, comprising a plurality of revoluble drums, means for connecting said drums together and disconnecting the same at will, a reversible engine connected with one of said drums and a brake connected with the other, a pair of single longitudinal hoist-lines disposed parallel to each other and each partially engaging one of said drums so as to simultaneously wind on and 01f the same, a bucket connected with both of said hoist-lines, and separate counterweights connected with each of said hoist-lines, said counterweights together being lighter than said bucket when loaded and heavier than said bucket when empty.

8. An equalizing-draft hoisting-gear, comprising a plurality of revoluble drums, reversible mechanism for actuating one of said drums in difierent directions, means for connectin g said drums together and disconnecting the same at will, hoist-lines partially wound upon said drums, a bucket connected with both of said hoist-lines and operated thereby, and counterweights connected with said hoist-lines, the aggregate weight of said counterweights being greater than that of said bucket when empty and less than that of said bucket when loaded.

9. An equalizing-draft hoisting-gear, comprising a plurality of revoluble drums, a

In testimony whereof I have signed my name to this specification in the presence of 10 two subscribing witnesses.

JAMES GRANT DELANEY.

Witnesses:

JNo. M. BITTER, WALTON HARRISON.

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