US179239A - Improvement in pulley-blocks - Google Patents

Description

I PULLEY-BLOCK. No. 179,239, Patented'J'une 27,1876.

Fig. 2-

{NVENTORI N- PEI'EHS, PKOTO-UTHOGRAFNER, WASHINGTON. D. C.

I and G the wire bail.

UNITED Srarns JOHN WEIR, OF NEW YORK, N. Y.

IMPROVEMENT IN PULLEY-BLOCKS.

Specification forming part of Letters Patent N 0. 179,239, dated June 27, 1876 application filed May 31, 1876.

To all whom it may concern:

Be it known that 1, JOHN \VEIR, of the city, county, and State of New York, have invented certain new and usefut Improvements on Pul- Icy-Blocks, of which the following is a specification This invention relates to that class of blocks in which a wire is used to form the bail and suspension-loop; and it consists in bending the suspension-loop in the middle of the wire bail, carrying the ends down in grooves in the cheeks of the blocks to the point where the sheaveaxle passes through, and forming eyes in the extremities to encircle the ends of the said axle, said eyes being sunk in corresponding recesses in the wood.

In the drawings, Figure 1 is a side elevation of my improved pulley-block, with the burr or washer removed. Fig. 2 is a vertical section of the block in an unfinished state, and Fig. 3 a similar view of the same completed.

Let A represent the block; B, the sheave, In the construction a loop, a, is bent in the center of the bail O, as shown, and eyes I) b in the extremities of the same. Suitable grooves are cut in the cheeks of the block to receive the bail, said grooves extending down to the center of the block. At this point, around the hole bored to receive the axle of the sheave, are sunk circular recesses just large enough to receive the eyes I) b of the bail, as shown in Fig. 2. The bail O is now put in place, and its eyes sunk into the recesses in the checks of the block. The sheave B is put in, and the axle D inserted, the ends of the latter passing through the eyes I) b of the bail, and projecting a little beyond on each side. Burrs or washers c c are now slipped over the extremities of the sheave-axle,and the latter riveted down thereupon, as shown.

By embedding the eyes b bin recesses formed in the wood, it will be seen that it is practically impossible for them to straighten out by -ters Patent, is as follows:

any strain on the suspension-loop a-in fact, the wire would part before this would occur. The strain is mainly borne by the ends of the sheave-axle; but if the eyes I) b are neatly fitted into the wood, the latter will bear a portion of the strain. Nuts screwed onto the ends of the sheave-axle might be used as a substitute for the washers c 0; but the latter serve the purpose equally as well, and are much cheaper. Indeed, it might be possible to rivet directly upon the wire; but I do not consider it advisable.

If desired, the washers may be sunk down to a level with the surface of the wood; but this is not necessary.

Any device by which the eyes I) b are prevented from slipping off the ends of the sheaveaxle may be used in carrying out my invention.

I am aware that metallic bails having the ends of the sheave-axle passed through their extremities and riveted are not new. A hail of this kind is shown in my Letters Patent of January 5, 1875.

Haviirg" now described my invention, what I claim as new, and desire to secure by Let- The combination of the wire bail O, bent at the center to form a suspension-loop, a, and at the extremities to form eyes I) I), the wooden block A, grooved on its outer faces to receive the arms of the bail, bored to receive the axle D, and recessed around the axle-bore to receive the eyes of the hail, the sheave B, the axle D, and burrs or washers c c, all constructed and arranged to operate as herein set forth.

In witness whereof I have hereunto si ned my name in the presence of two subscribing witnesses.

JOHN WEIR. Witnesses:

ARTHUR 0. FRASER, HENRY CONNETT.

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