US78663A - Joseph f - Google Patents

Description

JOSEPH F. HARCOURT, CF CINCINNATI, OHIO.

Letters Patent No.4 78,663, dated June 9, 1868.

IMPROVEMENT IN TACKLE-BLOCKS.

@in Stimuli tint-ttt tu it vtinte tttett nteut mit mating part uf tigt same.

To WnoM rr MAY ooNcnRN:

Be it known that I, JOSEPH F. HARCOURT, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Improvement in Sheave or .Tackle-Blocks; and I hereby declare the following to be a full,clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification. l

This is an improvement inV the class of inside iron-strapped tackle-blocks, having two or more sheaves, whereby the pin dr axlevis eifectually supported without detraoting from the strength ofthe partitions.

Figure 1 isa Vp:.trtially-sectioniaed front elevation of a triple sheave-block, embodying my improvements.

Figure 2 is a. similar `View' of a double sheave-block.

'Figure 3 is a partially-sectioni'zed side elevation of my improved block for tivo or more sheaves.

' Figure 4 is a cross-section of one of the partitions detached.

Inside iron-strapped tackle-blocks as heretofore constructed have proved insuiicient for the rough usage to l which such are often subjected, because the partitions `have either been ,separated each one into two parts by the strap, and liable to be torn apart so as 'to expose the sheaves to fracture, and the rope to be frayed out or run off, thus destroying the utility ofthe block, or where the partitions have not been so separated, then the pin,

having been inadequately supported, in consequence of havingy only a wooden bearing next the sheaves, has become bent or broken in use.

In my form of block, the partitions can be made of any desired thickness, without either increasing the weight and thickness ofthe straps or the distance of the sheaves'therefrom, and besides being in one piece, are susceptible of additional strength by theiintroduction of counter-rivets when desired. I

The wooden portion of my framework or block proper consists of the usual number of cheeks or sides, A, partitions C, and end-piece`s B. i

The straps D D are broad in the direction parallel with the sheaves E, and thin in the plane of the pinarA axle F, and are iet into grooves, Gr Gr', made in the sides of the cheeks 4and partitions, respectively, soas for that part of them near the sheaves to be ush, or nearly so, with the said cheeks and partitions, and while permitting earch cheek'and partition-to be in one continuous piece, also bringing the metal strap close up to.the sheave, se as eiieetually to support the pin. v

The inner strap is turned over the outer strap, so as to form a convenient eye, II, for the insertion of hoek or cordage-lashing, and for a triple pulley; The ends of the inner strap, D', are bifurcated, so as to extend on each side of the two partitions,`as at I, iig. 1. Y

The main rivets, J, pass from side to side entirely through the cheeks, partitions, and end-pieces, but are not, asin other inside-strap blocks, the only-means of junction ofvthese par-ts, because each partition, as well as cheek, is in one unbroken piece, and, furthermore, is susceptibleV of being secured by'eross or counter-rivets, L, which may be passed entirely through each cheek and partition, from edge to. edge, without interfering with the straps.

The central strap may, when required, be extended down, as at M, for the attachment of a. becket, N.

I claim herein as new and of my invention- A two or more sheave-tackle block, whose partitions, C, extend fromvside toside in Vone piece, and are formed with grooves, G', in their sides, for thereception of the inner forked straps D', all as herein described, for the purpose specied. I

In testimony of which invention, I hereunto set my hand. l JOSEPHA F. HARCOURT.

Witnesses:

Geo. H. KNIGHT, JAMES H. LAYMAN.

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