US87349A - Improvement in hoisting-gr - Google Patents

Description

"7 tbl-iisd:

aient l THOMAS McGRATI-I, OF ALBANY, NEVVYORK.

'Letters Patent No. 87,349, dated Maz/rch 2, 1869. w- 1 INIIPROVEMEN T IN HOISTING-GRAPPLES.

m The Schedule `referred to in these Letters Patent and making part ofthe Bamb- To all whom t may concern,-l

Be it known thatI, THOMAS MCGRATH, ofthe city and county of Albany, State of New York, have iuvented a` new and improved Mode of Constructin Hoisting-Grapples andv I do hereby declare' that the followiugwis a full, clear, and exact description thereof, `ref'erencebeing hadjto the accompanying drawings, forming a part of' this specication, and the letters of reference marked thereon, in whicl1 Figure 1 represents a perspective view of my invention, in the' operation of hoisting.

Figure 2 is'a longitudinal cross-section of' a grapple.

Figure 3 is a cross-section of grapple at clevis.

Figure 4- is a perspective view ot' grapple furnished with a grasping-point for bales, being only one modiiication of the form of such point/for" grasping.

The nature of Amy invention consists in making the hoisting-sling, consisting of a chain or rope, actas a lever and a fulcrurn, in and-at certain parts and point's of the saidrope or chain sling. This -I do by constructing the long arm of the grapple-irons with concave recesses, made in their under sides, which recesses are to recedive, and preserve from slipping, the rope or chain use At the termination of the said recessof each iron, I provide a clevis, or friction-wheel, properly ixed. The said clevis-may be U-shaped, or a suitable ring may be provided, and in case either a clevis, ring, or frictionroller is used, it is placed so that the sling-rope or chain will pass through or over it after leaving the concave recess.

The said'clevis; or its equivalents, 1s secured to the irons'in such a manner as to allow ahinge-like movement to the said clevis, that it may adjust itself to suit any `desired angle at which the grapple may be set.`

The-lower end of the grapple-iron is furnished with any vform of point or hook, for an impinging-'iace suitable to be applied to any box, bale, cask, and the like, to be hoisted.

These grapples work in pairs, and when a pair is slung with'a rope or chain passed through their cleviscs,

or their equivalents, the points Where the rope or chain impinges the said clevis, act as a iulcrnm, while that portion ofthe rope or chain setting in the concave recess,iand stifiened thereby, acts as the long-end of a lever. l' i When power is applied t0 the sling, to hoist or draw, as the case may be, the said rope or chain in the recesses presses up against the long end of the grappleirons, and causes tbc hook-end to iinpinge harder, and hold `firmer in the substance they are to grasp. The present mode of slinging grapple-irons from their upper ends, does'iiottusure, in manycasea-proper security against accident in hoisting heat;Y articles, and `has too often resulted in loss of life.

By my mode, the heavier the article to be raised, the

more iirm and severe will be the pressure or bite of the grapple on the article so raised or drawn, and accident can only result from breakage of some part of the hoisting-apparatus.

To' enable others skilled in the art to make and use my invention, I will proceed to describe it in reference to the drawings, and their letters of reference, the same letters indicating like parts.

A, fig l, represents a box being hoisted with the grapple G, constructed and slung after my mode.

The said grapple-iron G is constructed with a long arm, a., furnished with concave recess c, figs. 2, 3, and 4, the said recess running down in the under side ofthe said long arm, to the point where the lifting or grasping-hook f commences.

A little above where the recess c terminates, is hung a elevis, d, connected to the back of the iron by a suitable bolt or rivet, e.

I prefer to use the U-shaped clevis, although a ring,

attached by a staple or a friction-roller, properly held,

would, answer as an equivalent substitute for the same purpose.

The impinging-point ofthe hook f may be made in any suitable form, as may be best adapted to the material to be operated 011.

For boxes, barrels, casks, and' the like, I would prefer a blunt chisel-edge point; for bales to be handled without injury to their covers, I would prefer a roughened conveximpinging-surtce, as Z, iig. 4; for stone, timber, and the like, I would use a fish-tail point; while for hay, straw, and similar substance, I would use tine-points, similar to a fork.

These various forms of grasping or holding-points, one of which is Z, iig. 4, may be permanently or temporarily attached to the hook, as shown in 5g. 4. If temporarily attached, I would use two set-screws, s, which would pass through the side-lugs or ears o` of such temporary attached grasping-points Z.

In 'hoisting a box, bale, or anything of considerable width, the grapples, which operate in pairs, are eX- tcnded out in position, as shown in iig. 2, so as to embrace, by their hooks j, the substance to be moved, and when the rope, or its equivalent B, is pulled on, the long arm (twill be thrown up, as in iig. l, and the grasping-end f will be pressedinto or against the surface of the box or substance it iinpinges.- The rope or chain B, all the while impinging the clevis d, isat that point, the fulcrum, while that part ofthe rope sitting in the recess c, with the long end a of the grapple, acts as a lever, to throw the hook-end f against the resisting surface it impingcs. j Y

To move stone, timber, blocks of iron, and the like, I would cross the armso of a pair of grapples, and in other respects would operate the other partsas has been described.

This crossing ofthe arms a would give them an X- between nisbed with recess c and the grasping-end j', in combi- 'th the clevs d'or chain B, as and for the purand would contract the" space -formed nation w1 shape position,

the hooks f, and insure a firm grasp ofa narrow pose set forth, as specified.

THOMAS Moen/MH.

secure by Letters Pat- VVitnesses: Y

Y MICHEAL P. TYNER,

-ron constructed with a long arm, a, fur- HENRY P. NUGENT.

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