US57352A - Improved friction-pulley - Google Patents

Description

UNITED STATES PATENT OFFICE.

L. G. MASON, OF WORCESTER, ASSIGNOR TO HIMSELF AND S. S. BARBER, OF FITOHBURG, MASSACHUSETTS.

IMPROVED FRICTION-PULLEY.

Specification forming part of Letters Patent No. 57.352. dated August 21, 1866.

To all whom 'it may concern:

Be it known that I, L. G. MASON, of the city and county of Worcester, and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Friction- Pulleys; and I do hereby declare that the following is a full, clear, and exact description of the saine, reference being had to the aeY companying drawings, forming a part of this specification, in which- Figure l represents a side view of a pulley applied to its shaft. Fig. 2 represents a longitudinal central section on line A B, Fig. 1. Fig. 3 represents a cross-section of one of the friction-arms, looking in the direction of the arrow 2; and Fig. t represents a similar view of the other end of the same friction-arm, looking in the direction of arrow 3.

To enable those skilled in the art to make and use my invention, I will proceed to describe it.

In the drawings, Arepresents the shaft, upon which is placed the loose-pulley B and the friction-lever frame C, the latter being fastened to shaftA,in this instance,by a set-screw, a. (Seen in dot-ted lines in Fig. 2.)

Frame C has two projecting arms, D D, each of which has a slot, b, in which is placed a headeil pivot-bolt, c, which supports the rear end of a friction-lever, E, which is also pivoted at e to a slide-piece, d, which is arranged to slide up and down in a groove or slot in a flange, F, upon the friction-lever frame C.

The slide-pieces d have holes at their inner ends, through which cam-forks ff pass, the

latter being fastened to projections or ears g g I upon the shipper-piece G, which has a groove, h, and is operated in the usual manner by a fork or clutch lever.

The operation is as follows: Pulley B is loose upon shaft A, and is to be driven by al belt, which is always in motion during working hours.

When it is desired to operate shaft A, and thus put in motion any machinery connected with or driven by it, the operator forces the shipper-piece G toward pulley B, thereby forcing forks f f also in the same direction, whereby the cam-surfaces i i cause slides d d to move toward the periphery of wheel B, and thus bear the outer surface of the frictionarms E against the inner surface of a part of wheel B, as shown in dark lines, Fig. 2.

As wheel B turns in the direction of arrow l, as soon as the friction-arms E come in contact with the inner surface of the rim of wheel B the face of the pulley has a tendency to cause arms E E to expand and hug the rim of the wheel still closer, so that shaft A is caused to revolve with pulley B as long as the forks f f remain in the position shown in bla-ck lines, Fig. 2.

When, however, it is desired to stop shaft A, the operator throws the shipper-piece G back, as shown in red lines, Fig. 2, by which operation the cam-surfaces s s of the forks ff strike against the inner surfaces of the slots in slides d d, and withdraw the slides toward shaft A, as indicated in red lines, Fig. 2.

By this movement of the parts the frictionarms E E are withdrawn from contact with pulley B, and shaft A stops.

In this instance a leather covering,`6, is applied to the outer surface of the arms E; but, if desired, they can be used without such covering.

Again, in the drawings, plates j j are screwed on to hold slides d d in place in the slots in flange F 5 but the liange might be cast whole and cored out, so as to obviate the necessity of screws or extra plates.

The friction-lever frame C might be cast with a ange to extend in over the hub 7 of wheel B, and thus give the ends of forks f f a support as they are moved back and forth.

If at any time it is desirable to have the friction-levers E E thrown farther out nut 8 is loosened and bolt c moved in slot b toward shaft A the proper distance, after which nut 8 is screwed up again. Y

It will thus be seen that this friction device can b easily adj usted to compensate for any wear of the parts.

The device is simple in construction, not liable to get out of order, and thus obviates many of the objections to the various frictionpulleys now in use.

One or more friction arms or levers E may v each pulley.

be 'employed to operate in connection with 2. Making flange F with slots to receive the slides d, iu combination with providing Having described my improved frietiouarms D With slots b, for the purposes stated.

pulley, what I claim therein as new, and desire to secure by Letters Patent, is- L; G. MASON.

1. The combination of a hinged frictionlever7 E, with the slide d, frame c, und shipper- Witnesses:

.piece G, with a, cam-fork, f, substantially as THOS.H. DODGE,

and. for the purpose set forth. D. L. MILLER.

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