USRE1534E - Improved tackle-block - Google Patents

Description

` Specification forming part of Letters Patent PATENT OFFICE.

IsAAC E. PALMER, or MoNrvILLE, CONNECTICUT.

IMPROVED TAcKLE-BLock.

No. 25,978, dated November 1, 1859; Reissue No. 1,534, dated v i September 8, 1863.

To all whom it may concern:

Be it known that 1, IsAAC E. PALMER, formerly of the city and county of St. Louis, and lState of Missouri, now ot' Montville, in the county of New London and State' of Gonnecticut, have invented a new and useful Improvement in Tackle-Blocks and Pulleys; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification,

n which- Figure 1 is a front view of the block and pulley. Fig. 2 is a vertical section of the same at right angles to Fig. 1 in the plane indicated by the line wx in Fig. 1. Fig. 3 is a vertical section at right angles to Fig. 1. Fig.y 4 is a right sideview of the pulley. Fig. 5 is a front view ofthe same. y

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in so constructing a tackle-block and pulley that the rope or fall, when desired, may be clamped between a portion of the block and a portion ot' the pulley and so secured without tying or the use of any other fastening.

To enable others skilled in the artto make and use my invention, I will proceed to describe its construction and operation.

A is the block, made of any suitable external form, and having provided in it a recess or cavity, a a b b', for the reception of the pulley or sheave B. This pulleyis made with a surrounding groove, c, like that in an ordi- /nary pulley or shea-ve, for the reception of the rope Gf, and at one side of this groove it has l a concent-ric cylindrical projection, d, the cirwill be presently explained. The pulley is secured in the block by a concentric pin, g, upon which it works in the usual manner.`

enough in all directions for that part of the 4 pulleyv and the rope to work freely within it; but the portion b b of the said recess, which receives thecylindrical portion el ot' the pulley, is made very littlelarger than sufficient for the said portion of thepulley, and not large enough to permit the rope to work between it and the cylindrical portion of the pulley.

The operation is as Jfollows: When the fall fand other portions ofthe rope. U work in a plane or planes parallel with therplanes of revolution ot the sheave, the pulley revolves freely in theblock in either direction; but if the fallfbe drawn oi'obliquely to such planes,

as indicated in red ou-tline in Fig. 1, and so` caused. to slip through one of the openings e e in the iiange or lip which is next the cylindrical port-ion d, the instant it is let go it will be drawn by the weight or strain on the tackle between the end e of one of the said openings and the part b of the recess a a b b', and so .jammed or gripped hard enough to secure it without tying or the use of any other means of fastening. When power is again applied to the fall f, it at once liberates itself by the turning of the pulley.

I do not'contine myself to the precise form herein described and represented of the pulley or of the cavity provided in the block for its reception; but

What I claim as my invention, and desire to secure by Letters Patent, is-

So constructing a tackle-block and pulley that the rope or fall, when desired, may be clamped between a fixed portion ot' the block l and a portion of the pulley, substantially as herein described, by simply leading it in a direction oblique to the plane of revolution of the pulley without tying or the use of dogs, movable stops, or any other means of fasten- Ing.

ISAAC E. PALMER.

Witnesses: Y THos. S. J. DOUGLAS,

M. M. LIVINGSTON.

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