US352062A

US352062A - Chaeles f

Info

Publication number: US352062A
Authority: US
Publication date: 1886-11-02
Anticipated expiration: 1903-11-02

Description

(No Model.)

. 0. F. MORSE.

EXPANSION PULLEY.

No. 352,062. Patented NW2, 1886.

- UNITED H STATES PATENT 'OFFICEQ CHARLES r. Mon's'n, on RA DO P ASSIGNOB or ONE-HALE TO JOSEPH n. DENISON, OF wnsr RANDOLPH, VERMONT.

EXPANSlON-PULLEY Pncrr'rA'rroiv forming partof Letters Patent No. 352,062; dated. November 2, 1886.

Application filed February 9, 1886. Serial No. 191,304. (No model.) v i ings.

' My invention relates'to that class of machinepulleys in which the diameter of the pulley can be'readily varied at will, without affecting its stability or strength, for the purpose of increasing or decreasing its circumference or flat face, thereby more perfectly adapting itto the length of the belting used as well as to the speed of its revolution, and the objectsof my inventionare, first, to obviate the necessity of using belting of different lengths and the changing of the length of a single belt to meet the demand required, and, second, to enable the op-.

erator to vary exactly the speed of the pulley,

as the change in its circumference may be little or great, according to the object desired to be accomplished. These objects I attain by constructing the rim of the pulley of metal,

consisting of an elastic coil, preferably made of steel, and supported upon shoes on the ex-' tremities ofthe several spokes, the rim being prevented from slipping on the shoes by means of friction-rollers which intervenebetween'the upper surface of the shoes and the spring-coil or rim. The spokes of the pulley are jointed,

the two parts beingrigidly connectedtogether by right and left screws, by turning which the lengths of the spokes are susceptible of such variation as may be desired, and thereby cause the length or circumference of the .rim or flat face of the pulley to be increased or diminished. In the drawings, in which similar letters indicate like parts, Figure 1 is a side elevation, partly in section, of a pulley embodying my invention. Fig. 2 is a plan view of the same.

A is the rim or external face of the pulley. It is composed of a coil of steel,which is made to pass several times over the shoesB B,which are rigidly secured to the outer extremities of the jointed spokes C G, the'other ends of whichwhen the coil is in place between the lips or projecting sides I) bof the shoes, the width of the flat face of, the pulley thusformed will be practically the same throughout. In one or more of the spaces at d, between the arc of the rim A and the central or flat portion of the shoes above the ends of the spokes O C, is placed transversely a friction-roller, E, which effectually holds the rim in place, and prevents its slipping on the shoes as soon as it becomes tightly crowded between the rim and the end of the shoe B, upon which the rimA rests.

The spokes O O of the pulley are jointed at or near their centers, and the two parts e f are rigidly connected by right and left screws F F in such a manner that, according as these screws are turned,the length of the spokes O C are increased or decreased to the extent desired, and the distance of the several shoes B B from the 'hub D being thus correspondingly varied the length or circumference of the coiled spring or flat face of the pulley isincreased or diminished, as the elasticity of the, spring compels it to press tightly upon the shoes, thus maintaining its stability and strength,whatever may be the diameter obtained. As this operation can be easily performed at any time when the pulley is at rest, it is evident that-the pulley may be T readily adapted to the length of the belting, and exactly according to the circumference required for the speed desired.

All changes in the diameter of the pulley can be easily madewithout the necessity of removing the pulley from the shafting or changing the belting.

The lipsjor sides I) b of the several shoesB B are designed to be of the same height as the thickness of the rim or flat face A of the'pul ley, and they may be so extended as to form a continuous outside guard to the rim. They may also be arranged with adjustable setscrews through their sides, to more rigidly hold the adjoining portions of the coil together, if so desired, without departing from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent, isv 1. An expansion-pulley composed of a rim consisting of a metallic coil supported upon shoes attached to the extremities of jointed spokes projecting from the hub, the two parts of the spokes being rigidly connected by right and left screws in coupling-boxes, by means of which the length of the spokes and the circumference of the pulley are correspondingly va- 5 ried, substantially as shown, and for the purpose described.

2. In an expansion-pulley, the rim A, consisting of a coil of steel having tapering ends, in combination with the shoes B B, frictionroller E, jointed spokes O 0, whose length can be varied by right and left screwsin their coupling-boxes, and the hub D, substantially as and for the purpose set forth.

3. In combination with the coiled rim A of I 5 an expansion-pulley, the shoes B B, having sides b b, the spokes, hub, and friction-rollerE, substantially as shown and described.

4. In an expansion-pulley, the hub D and rim, in combination with the jointed spokesC O, rigidly held by coupling-boxes provided 20 with right and left screws, and the shoes B B, attached to their extremities having sides I) b, and set-screws, substantially as described, and for the purpose set forth.

In testimony whereof I do afiix my signature 2 5 in presence of twowitnesses.

CHARLES F. MORSE. Witnesses:

J. D. DENIsoN, R. T. DUBoIs.