US357641A - James swalwell - Google Patents

Description

(No Model.)'

J. SWALWELL & J. MOORE.

I PULLEY BLOCK. No. 357,641. r Patented Fe b. l5, 1887.

N. PETERS, Pnnmumu n-r. Walhinglon. D. c.

'rA'rns JES SVVALWELL, OF BATTERSEA, COUNTY OF SURREY, AND JOHN MOORE,

OF SOUTH STOOKTONON-TEES, OOUN TY OF YORK, ENGLAND.

PULLEY -BLOCK.

SPECIFICATION forming part of Letters Patent No. 357,641, dated February 15, 1887.

Application filed May 5,1886. Serial No. 201,119.

.To all whom it may concern:

Be it known that we, J AMES SWALWELL, of Battersea, Surrey county, England, and J oHN MOORE, of South Stockton-on-Tees, in the county of York, England, have invented certain new and useful Improvements in Pulley- Blocks; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to sheave and geared pulley-blocks; and it consists in making the said pulley-blocks self-sustaining in a more simple and advantageous manner than hitherto.

Figurel isafront elevation of ourilnproved pulley-block. Fig.2 is an end View of same.

On a central pin, a, is fitted loosely an eecentric, b, a long arm, 0, and a short arm, I), 'the said eccentric and long and short arms being formedin one piece. On the eccentric b is mounted a sheave, 0, and the long arm e carries on its outer extremity two small rollers, e and e A connecting-link, g, is pivoted to the short arm I), and to the lower end of the said connecting-link is hung one end of the lifting chain or rope. A brake, (Z, is mounted loosely on a pin in a line with the periphery of the sheave 0. In preparing this block for lifting, one end of the rope is attached to the connecting-linkg on the short arm b, and the other end is passed under a snatch-block, k, then carried over the sheave e, which is mounted on the eccentric b, and

thence down between the two small rollers e and e on arm a. In lifting, the loose end of the rope is pulled and the Weight isthen sus' pended. On the power ceasing to be applied the part of the load suspended from the short arm 1), at one side of the pin a throws the ee- 40 eentricb and the sheave 0, carried on the said eccentric, up to the brake, thus preventing the load from running down. On again ap plying the power to the loose end of the rope the sheave is drawn clear of the brake. Thus the friction required to sustain the load does not act against the lifting-powers of the apparatus. For lowering handover-hand, justsufficient tension is put upon the rope to draw the sheave clear of the brake by the lever- (No infidel.) Patented in England September 12, 1884, No.12,309.

age of the long arm. For lowering quickly, a cord is pulled which is attached to the long arm.

Figs. 3 and 4 are a modification showing a block with two eccentrics, b and b, a dividing-plate, and a long arm, 6, the said eccentries, dividing-plate, and long arm being all in one piece. On each eccentric is mounted a sheave, c and c, in a line with the periphcry of the sheave c, which is carried by the eccentric b. On the same side of the pin a as the long arm is mounted a brake, d, as in Figs. 1 and 2. In preparing this block for lifting, one end of the rope is attached to the frame of the snatch-block 7c. The other end is then passed up over the free sheave c in the 6 top block, thence under the sheave in snatchblock k, and up over the sheave, under the brake d in the top block, and down between the rollers e and e on long arm 0. Inlifting and lowering, the action is the same as in Figs. 1 and 2, the eccentric carrying the free sheave taking the place of the short arm 6.

Figs. 5 and 6 are other modifications showing a block in which we move the brake d to the sheave, instead of the sheave to thebrake, as in Figs. 1, 2, 3, and 4. To effect this, we swing on a pin, a, the long arm 6, carrying at its lower end the small rollers e and e and on its upper end an eccentric. On one part of this eccentric the brake d is suspended and the other portion of the eccentric carries the eonnectinglink g, to which one end of the rope is attached. In some cases we use two eccentrics, 'on one of which the brake d is suspended, and to the other we attach one end of the rope and then reeve it, as in Figs. 1 aud2. In lifting and lowering, the action will be the same as with the blocks shown in Figs. 1, 2, 3, and 4. It will be seen that moving a brake to a frictionsurface by part of the load and releasing the same through an arm by every pull on the hand-rope can be applied to any pulley-block. In this case an endless hand-ehain is used, one end of the lifting-chain being hung to the eccentric which applies the brake and 5 the other end passed over the liftingbarrel, a snatch-block being carried on the loop thus formed.

Having thus described our invention, we de- 1 In testimony that we claim the foregoing we 10 sire to claim--- have hereunto set our hands this 13th day of In a pulley-block, the combination of the February, 1885. eccentric 2), provided with long and short arms,

5 the pulley-wheel loosely pivoted on pin a, the

link 9, pivoted to short arm I), and the brake I Witnesses: d, all arranged and connected with the chains, l GEO. J. B. FRANKLIN,

to operate substantially as and for the pur- J NO. DEAN pose set forth. I Bofh of 17 Gracchm'ch Street, London.

JAMES SVVALWELL. JOHN MOORE.

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