US840676A - Pulley-block. - Google Patents

Description

No; 840,676. 4 PATNTEDJA'N. s, 19o?.

- G.' T. WINNARD & J. BEDFORD.

PULLEY BLOCK. APPLIDATIDN PILDD nu 1. 1906.

' THE Nomels PETERS cn..'wAsHlNcroN, D. c.

UNITED STATES PATENT OFFIOE.

GEORGE T. WINNARD AND JOSEPH BEDFORD, OF SHEFFIELD, ENGLAND.

PuLLEY-BLOCK. i

Specification of Letters Patent.

Patented Jan. 8, 1907.

E Application filed May 7,1906. Serial No. 315,561.

To a/ZZ whom it may concern,.-

Be it known that we, GEORGE THOMAS WINNARD and JOSEPH BEDFORD, subjects of the'King of Great Britain, residing at Washford Road, Shefield, county of York, England, have invented certain new and useful Improvements in Pulley-B10 cks, of which the following is a speciiication, reference being had therein to the accompanying drawings.

This invention relates particularly to such wire-rope blocks as are described in the s eciication of British Patent No. `7 ,922, ated April 15, 1896; but it may be applied to other blocks having two winding-drums, and it refers to the construction of the lower block carryin the lifting-hook and a part of the upper bock employed in connection with the lower block.

The invention is shown in the annexed drawings, in whichy F ifrure 1 is an elevation of a top and bottom lblock with portions of details removed and' parts sectioned; Fig. 2, details of improvements in section.

The lower block consists of two horizontal bars or bearers A, between which at each end is Supported apulley B, and these pulleys rest in the loop of the wire rope O, which depends from the upper block. In the center of the bearers there is a cross-bar D, which carries the lifting-hook E, and over the nut which is screwed upon the shank ofthe hook we place a semicircular or arch-shaped rope-supportJ F, having a groove F2 in its periphery to receive the center part of the loop of wire rope between the two pulleys B.

Centrally between the plates G in the lower part of the upper pulley-block is supported a rope-carrier H, having a semicircular groove I cut in its side face and located directly When the loo of wire rope is passed over and supported y the carrier in the upper block, the maximum of liftingpower is obtained; but if the loop is removed from the upper block and placed in the grooved support F of the lower block then the quickest lifting movement is obtained and the len th of liftingcapacityis doubled. We alsobyiiliis arrangement produce a two-part block capable of closing together within the least possible space, and this is a matter of the greatest importance in confined spaces, such as between decks of men-of-war, and other like confined positions. Each rope-support F or H may be used separately.

Having now particularly described the nature of our said invention, we declare that what we claim is- In pulley-blocks, comprising upper and lower blocks the combination with t e lower block of the grooved rope-support F, substantially as set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

. GEORGE T. WINNARD.

JOSEPH BEDFORD. Witnesses: r

ROBT. F. DRUEY,A ENSOE D. DEUEY.

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