US249443A - On - tees - Google Patents

Description

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PULLEY BLOCK No 249,443; Patented Nov. 8,1881.

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N, PETERS. PhoQaLilhognphar, Waihiuglon. D.C.

UNITED STATES PATENT OFFICE.

THOMAS income, on SOUTH STOOKTON-ON-TEES, AND CHARLES A. HEAD,

or STOOKTON-ON-TEES, ASSIGNORS T HEAD, w IeRrsoN & 00;, on THE TEESDALE IRON WORKS, STOOKTON-ON-TEES, COUNTY or YORK,

ENGLAND.

'I5ULLEY-BLOCK.

SPECIFICATION forming part of Letters Patent No. 249,443, dated November 8 1881.

Application filed February 10,1881. (No model.) Patented in England September 28, 1870.

To all whom it may concern Be it known that we, THOMAS MOORE, of South Stockton-on-Tees, in the county of York, England, engineer, and CHARLES ARTHUR HEAD, of the Teesdale Iron Works, Stocktonon-Tees, England, engineer, have invented new and useful Improvements in Pulley'Blocks for Raising and Lowering Sacks and other Weights, which improvements are fully set forth in the following specification, reference being had to the accompanying drawings.

This invention has for its object improvements in pulley-blocks for raising and lowering sacks and other weights. For this purpose we construct a pulley-block with a small chainwheel, over which is passed a chain, to either end of which the sack or weight to be raised or lowered is attached. The small chain-wheel has cast concentric with it at one of its sides an internal toothed wheel, into which gears a pinion, cast at the side of and concentric with a driving -wheel, over the periphery of which an endless driving chain or cord is passed.

The drivingwheel is of considerably larger diameter than the chain-wheel, and when the driving-wheel is turned, by pulling round the endless driving chain or cord a revolving motion is imparted at a reduced speed to the chain wheel and to' the lifting chain which passes over it. The pins or axes upon which the chain-wheel and the driving-wheel revolve are formed in one piece, they being connected one with the other by a central crank piece. The outer ends of the pins or axes are passed through the side bars of the pulley-frame, and are secured by nuts. The pulley-frame, as is usual, is provided with a hook, by which it can be suspended where desired.

In order that our said invention may be most fully understood and readily carried into effect, we will proceed to describe the drawings, hereunto annexed.

In the drawings, Figure 1 is a side view of a pulley-block constructed according to our invention. Fig. 2 is a cross-section of the same; and Fig. 3 is a section taken at the line A B, Fig. 2.

a a is the frame of the pulley-block. It is provided with a hook, or, by which it may be suspended from any suitable support. Zr 1) is a cranked axis or pin fixed in this frame. 0 is the chain-wheel, over which the lifting and lowering chain (1 is passed. fixed axis or pin 11. cast in one piece with thechain-wheel c. f is a pinion gearing with the ring of internal teeth 6. The pinion f also turns freely on the axis or pin b, and the driving-wheel g is formed'in one piece with it. An endless band, cord, or chain for actuating the apparatusis passed over this wheel.

We are aware that pulley-blocks have heretofore been constructed in which two wheels or pulleys are employed, one working loose upon an eccentric and the other keyed to a straight revolving shaft passing through and fixed to said eccentric, anioscillatin g plate and a cogged wheel gearing with internal teeth formed upon onepulley being arran ged between said pulleys; but this is essentially different from ours both in construction and operation, as it operates upon the principle of gaining one tooth or notch for each revolution of the drivingwhe'el, and as it is designed for lifting heavy weights the movement of the chain-wheel is very slow, as each revolution requires as many complete It turns freely on the e is a ring of internal teeth turns of the driving-wheel as there are teeth on the eccentrically-operated pinion or inside wheel, while our device, which is designed for lighter weights and faster movements, has no eccentrics or eccentric movements, as its operation is not essentially difierent :from what it would be if the teeth 6' were on the outside and the pinion f exterior. By making it in ates as an interior support for each of the two pinion f, and lifting-wheel 0, having the inteaxes,- which has not heretofore been acoomnor gear or cogs e, constructed and operating plished when the axes were not in line. substantially as shown and described.

Havin thus described the nature of our in- 5 vention and the manner of performing the HEAD same, we would have it understood that we claim as our improvements in pulley-blocks for Witnesses:

raising and lowering sacks and other weights WALTER H. MILLS,

The fixed bent shalt b b and frame a, in com- HENRY ROBINSON, ro bination with the driving-wheel g, having the Solic'itors Ole r708.

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