US3421A - w waterman - Google Patents

Description

UNITED sNTATEs PATENT oEEioE.

`S. WATERMAN, OF GREENWICH, CONNECTICUT, AND I. D. RUSSELL, OF NEI/V` YORK, N. Y.

SHIPS BLOCK.`

Specification of Letters Patent No. 3,421, dated January 31, 1844.

To all whom, t may concern: n

Be it known that we, STEPHEN IVATER- MAN, of Grreenwich1 in the county of Fairfield and State of Connecticut, and Isaac D. RUSSELL,` of the city, county, and State` of New York, have invented a new and useful Improvementin Ships` Blocks; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specifi-` cation, in which-4 Figure l is ablock complete; Fig. 2, parts detached; Fig. 3, a double block.

The letters are to` designate the same parts in all the figures.

The nature of our invention consists in putting the iron strap through on the inside of the block on each side of the sheave and brings the bearing of the sheave close to the strap by means of which a smaller pin can be used and much friction avoided.

The construction [is as follows: The shells (a) of the block are of any suitable `form now in common use, the inner faces of them having a groove (b) cut in them running their whole length through the center, ldeep enough to receive the straps their whole thickness. The strap (o)` is formed ofa flat barof `iron bent intoa loop at the center in form like a letter U, the` two ends running straight and parallel. The curved part is rounded in its cross section to serve as a loop to the block. Through the center of the length of each of the straight sides of the strap a hole is made, and when the shells are put together and bolted at each end a suflicient distance apart to admit the sheave the strap is passed down the grooves above described; a hole is made through the shell at the center which corresponds with` l those through the strap; the sheave (c) through the end of the block opposite the loop and a pin (f) passes through it for a becket, but in small blocks this is not done, and the strap will only reach far as the center for the pin to pass through.

In double blocks we employ two sets of straps, one inside the other; the loop of the inner one, cominnr up under the outside one. This is shown in Fig. 3. In treble or quadruple blocks, three or four straps are combined in a similar way. Blocks made in this way are strong and produce lessfrictio-n than any others now in use, and by presenting a smooth shell outside, prevent the usual chalingof the rigging occasioned by straps or ropes projecting from them outside; the block is also freed from the danger of splitting since the pin through the sheave does not bear upon the wood at all, and no strain comes upon the sheave.

What we claim as our invention and desire to secure by Letters Patent is p Constructing the blocks in the manner described with `the straps passing down through the shell on the inside close to the sheaves in the manner and for the purpose herein described.

` STEPHEN WATERMAN. ISAAC D. RUSSELL. Witnesses to signature of S. Vaterman:

I-I. A. PEoK, TIMOTHY P. Buttons. 'Vitnesses tosignature of I. D. Russell GEOJB. SHERwooD, `LEWIS BENTE-N, f

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