US693507A - Friction-clutch. - Google Patents

Description

No. 693,507. Patented Feb. la, |902.

G. H. FABMAN.

FRICTIN CLUTCH.

plication filed June 7, 1901.)

(No Modl'.)

i ill L9 ,t 1;.

www.nnnmmlmumlw f No. 693,507. Patented Fen. la, |902. G. H. FAHMAN.

FRICTIUN CLUTCH.

(Application iled June '7, 1901.) (No Model.)

2 Sheets-Sheet 2.

THE Non ns vsvsns co to n c rrr GUY II. FARMAN, OF DENVER, COLORADO.

FRICTION-CLUTCH.

SEECIFIGATION forming part of Letters Patent No. 693,507, dated February 18, 1902.

Serial Nol 63,621. (No model.)

To all whom, it may concern:

Be it known that I, GUY II. FARMAN, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Oolorado, have invented certain new and useful Improvements in Friction-Clutches; 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 artto which it appertains to make and use the same, reference being had to the accompanying drawings, and to iigures of reference marked there on, which form a part of this specification.

My invention relates to friction-clutches7 and more particularly to that class of clutches in which a lever operates a shoe arranged to engage the flange of a friction-wheel and is designed to impart an intermittent rotary motion to the wheel by reason of substantially reciprocating motion imparted to the end of the lever. The shaft to which the wheel is secured may have a gear, a worm, or any other mechanical equivalent for driving a moving part.

The device is simple, efcient, and cheap.

Referring to the drawings, in which like parts are similarly designated, Figure l shows a plan View of my device, partly in section. Fig. 2 is afront elevation showing the clutchwheel broken away to expose the operative parts. Fig. 3 is an elevation, and Fig. 4: a plan, partly in section, showing the shoe on the outer periphery of the wheel-rim.

The wheel et is secured to a shaft 5, which shaft is held in a bearing 6, bolted to a suitable part, here shown as a Wooden post '7. Loosely mounted on the shaft 5 is an arm 8, provided with an oiset 9. In the outer or offset portion 9 is jonrnaled a stub-shaft 1l, keyed to or made integral with a lever-arm 10, and on this stub-shaft is a smaller one 12, eccentric thereto, that performs the function of a cam. On this eccentric portion or cam is carried shoe 13, which engages the rim of the brake-wheel. This shoe is formed with a clutching-face le of a curvature to correspond with that of the wheel-rim and a rear or stopping face 15, here shown as straight, said face 15 arranged to be cammed against the complementary face 16, that forms the oset 9 of the piece 8. I have here shown the complementary faces 15 and 16 between the shoe and part 9 as straight; but they may be made of any shape desired to accomplish the desired result-namely, to prevent the leverarm 10 from rotating around its pivot when being moved down, so that said arm 10 will be locked during this movement by the shoe to the arm 8, so that both of them will move down as a unit to perform the double function of releasing the shoe from the wheel and positively rotate the arm 8 in a direction preparatory to taking a new hold on the wheel.

The operation will be as follows: All the parts being movable, when the lever 10 is depressed the eccentric 12 will be rotated toward the center of the Wheel and cam the straight face l5 of the shoe against the straight face 16 on the part 8, thus locking the shoe, the lever, and the part 8 rigidly together, and they will move as a unit around the shaft 5 as a common axis of rotation clear of the rim of the wheel. When the lever l0 is lifted, the shoe 13 will be cammed against the rim of the wheel and its clutching-face held thereto, and the wheel, shoe, lever, and piece 9 will be rotated in the opposite direction as a unit. In this manner a step-bystep rotation can be imparted to the wheel to operate a moving element. Should it be desirable to use this simply as a frictionbrake for stopping the rotating of shaft 5, the construction will be equally applicable.

It will not be absolutely necessary that the part 8 have its center of rotation coincident with that of the Wheel when used only to stop the rotation of the shaft secured to said wheel. The part 8 can of course be extended beyond the Wheel-rim, the offset suitably located, and the shoe 13 provided with a concave face and arranged to be cammed against the outer surface of the Wheel-rim, as shown in Figs. 3 and 4, the operation being identical with that just described.

.Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. In combination, a Wheel, an arm journaled to rotate about a point, a lever, a stubshaft thereon and journaled in one end of said arm, a cam secured to the stub-shaft and a shoe on said cam, whereby when said IOO lever is rotated with respect to the arm, the shoe is moved to or from said Wheel, substantially as described.

2. In combination, a wheel, an arm jour naled at one end to rotate about a point and provided with an offset, a lever, a stub-shaft thereon journaled in the other end of said arm, a cam on the stub-shaft and a shoe on the cam, whereby the rotation of said lever in one direction Will cam the shoe against the Wheel and in the other direction against the offset, substantially as described.

3. In combination, a Wheel having a suitable rim, a shaft secured to the Wheel, an arm journaled at one end on said shaft and provided With an offset, a lever provided with a stub-shaft journaled in the other end of said arm, a cam on the stub-shaft, a shoe on the cam having a convex engaging face adapted to engage the inner periphery of the Wheelrim, whereby when the lever is moved in one direction will cam lthe shoe against the inner periphery of the wheel-rim and when moved in an opposite direction cam the shoe against the offset, substantially as described.

4. In combination, an operating-shaft, a Wheel secured thereto, an arm loose on the shaft with an offset, a lever provided with a stub-shaft journaled in the free end of said GUY H. FARMAN.

Witnesses:

DAVID LLOYD, F. G. ROBERTS.

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