US395256A - Split pulley - Google Patents

Description

Patented Dec. 25, 1888.

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J.'T. WILLINGHAM.

* SPLIT PULLEY. No. 895,256.

UNITED STATES PATENT OFFICE.

JOHN T. \VILLINGIIAM, OF CIIATIANOOGA, TENNESSEE.

SPLIT PU LLEY.

SPECIFICATION forming part of Letters Patent No. 395,256, dated December 25, 1888.

Application filed March 13, 1 8 88.

T0 aZZ whom it may concern;

Be it known that I, JOHN T. \VILLTNGHAM, a resident of Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Split Pulleys; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates particularly to split pulleys of wood. Its objectis to increase the strength and durability of the pulley and to provide means for conveniently adapting the same pulley to shafts of different diameters, while decreasing the liability of the pulley turning upon instead of with the shaft,

In the accompanying drawings, Figure 1 is a side elevation of the complete pulley. Fig. 3 is a section on the line :1 y of Fig. I. Fig.

b is a section through the rim, showing the manner of joining the parts composing the rim. Fig.1 is asection on the line a 1 Fig. 1.

I am aware that many of the features of constriu-tion shown and described have been set forth inprior patents, and I do not thercfore claim novelty, except as hereinafterspmciiied.

In the drawings, A A are circular rimsegments, each of nearly one hundred and eighty degre s, made up of a series of plane plates Q united to form the belt-surface.

B B are two nearly-diametrical spoke-arms lying upon opposite sides of the center and joined at each end, respectively, to the rimsections near the ends thereof by means presenting nothing new.

(1 are intermediatespoke-amnsthat may be increased in number or omitted entirely. Two similar blocks, 1) I), are gained. into and secured to the adjacent tacos, respectively, of the arms I 13, near the middle thereof. These blocks are cut away to receive, respectively, the exteriorly noncylindrical blocks E E, which, however, are not united to the blocks I) I). Each of the blocks E E is provided upon its inner face with a cylindricalgroove at right angles to the plane of the pulley. The grooves register with each other and toi the blocks E E.

Serial No. 267,130- (No model.)

gether form a little less than a complete circle when seen axially.

The two arms I I and the intervening blocks I) l) are pierced for the passage of bolts G G, which, however, do not pass through \Vhen the pulley is placed upon a shaft-as F, for example-the blocks E E serve as bushings and are drawn firmly against the shaft by the bolts G (i and by bolts G G, passing through the spoke-arms B l3 near the rim of the pulley.

I E the blocks I) D E E be properly proportioned with reference to each other and to the diameter of the shaft, the latter will prevent the blocks 1) and E, respectively, from meeting the correspomling blocks, ID E, and the entire strain. of the bolts will be exerted in pressing the bushing-blocks against the shaft, and evidently the same force must prevent the slipping of the bushing longitudinally in the blocks I) D. The pulley is thus securely mounted upon the shaft with no possibility of tanning upon the bushing itself, owing to the non-cylindrical exterior of each half of the latter.

The rim of the pulley formed from the usual plane members Q, sufficient in number to give the required thickness or width to the rim, and these are secured together by dowelpins J .I, preferably parallel to the shaft and driven into position while coated with glue or other adhesive substance. They are found practically to give in a high degree lightness and durability under all conditions of use, being unaffected by temperature and moisture.

Pulleys of this kind are made with the same recess for bushing-blta'ks, and the latter are all of the same size and form of exterior, but are grtmved for shafts of diltcrent sizes, and as none of the bolts pass through the blocks new or ditiertmt ones may be inserted in any pulley by simply loosening the nuts upon the bolts uniting the halves. When the blocks E E are formed as shown, they autonnttically adjust themselves in position and shrinkage of the wood is of little detriment in any way.

W hat I claim is In a wood split pulley, the con'ibination, with two semicircular rim-sections, each having a chord-like arm joining points near its ends, of two equal slightly-separated hub-sections resting in gains in the inner or contiguous faces of the arms, respectively, a bushing composed of two slightly-separated similar parts, each internally grooved to fit the shaft and externally fitting a non-cylindrical seat in one of the hub-sections, and bolts passing through both arms and both hubsections Without the bushingand adapted to clamp the bushing upon the shaft, substantially as IO set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOHN T. XVILLINGHAM.

\Vitnesses:

FREDERICK GATES, C. 0. SMITH.

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