US150103A - Improvement in friction-clutches - Google Patents

Description

T. SYMONDS.

Friction-Clutches.

N0.l50-,IO3, Patented April 21,1874.

[ux VA,

NrTEn STATES PATENT EEIcE.

THOMAS sYMoNDs, or cAMDEN, NEW JEnsEY.

IMPROVEMENT IN FRICTlON-CLUTCHES..

Specification forming part of Letters Patent No. 150,103, dated April Q1, 1874; application filed March 10, 1874.

To all whom it may concern: Be it known that I, THOMAS SYMoNDs, of Camden, New Jersey, have invented an Improvement in Friction-Brakes, of which the following is a specification:

The object of my'invention is the construcltion of a simple and effective iriction-brake to be used in connection with hoisting mechanism or driving pulleys or wheels which have to be connected to or disconnected from a driving-shaft; and this object I attain in the manner which I will now proceed to describe, reference being had to the accompanying draw- A in g, in which- Figure l represents a vertical section of the friction-brake, Fig. 2 being a transverse section on the line l 2, and Fig. 3 a detached view of one of the links.

A is the driving-shaft, on which the barrel B of hoisting mechanism is arranged to revolve freely, one end of the barrel having a disk, a, forming part of a iiangc or rim, b, the interior of which presents a surface adapted to brake or friction blocks D, of which there are four in the present instance, as shown in Fig. 2. rlhese blocks are confined between a disk, E, secured to or forming part of the driving-shaft A, and a ring, F, attached to the said disk, and are guided laterally by projections d on the said disk, as shown in Fig. 2. Each block D is connected by a link, G, a sectional view ot' which is shown in Fig. 3, to a collar, II, so adapted to the tubular portion A ofthe driving-shaft which projects beyond the disk E that it can slide freely thereon. A key, c, passes through the collar H, and through a slot in the tubular portion A of the shaft, and within the latter is a spiral spring, against which the key bears. A pin, I, is fitted into the end of the shaft, and is slotted at the inner end, so as to embrace the key and bear against the same. (See Figs. l and 4.) In the present instance, a bell-crank lever, J, is hinged to one of the bearings of the drivingshaft, its short arm bearing against the end of the pin I, so that by depressing the long arm of the lever, the pin I can be forced inward. Any other suitable device may, however, be employed for operating the pin.

The shaft A, disk E, collar II, brake-blocks D, links G, and pin I all revolve together, and as long as the brake-blocks, links, and collar are in the position shown in Figs. l and 2, these parts must revolve independently of the barrel, but on forcing the pin I, and with it the collar H, inward, all the brake-blocks D must be necessarily forced outward and against the interior of the rim b, when the barrel B must necessarily revolve with the driving-shaft. v

' The guides cl are important elements when viewed in connection with the collar, links, and brake-blocks, for the moment the blocks come in contact with the rim b, they would be displaced laterally, andthe links would be subjected to violent strains but for the presence of these guides.

It will be seen, on referencel to Fig. 3, that each link is composed ot' two ,parts connected together'by a screw-coupling, m, and secured by tightening nuts a n, so that the length of the link may be increased or diminished at pleasure. rlhe most delicate adjustinent'of the blocks, so that all may act simultaneously on the rim, may be thus accomplished through the adjustment of the links. l

As a simple and effective device, through the medium of which the brake-blocks can be operated, the central'pin I forms a special feature of my invention.

It will be evident that the rim b may be secured to or forin a part of a drivin g-wheel or driving-pulley lullig' loosely to the drivingshaft, in place of the barrel B.

I claim as my inventionl. The combination of the disk Fi on the driving-shaft and its guides el with brakeblocks D, operated through the niediuni of de vices substantially as described, and with the rim l) of a barrel or driving wheel or pulley hung loosely to the said shaft.

2. The sliding collar l-I, connected `to the brake-blocks, and arranged to slide on but turn with the driving-shaft, in combination with a central pin, I, adapted to the tubular portion of the shaft, and to the key e of the slide, all

substantially as set forth.

Y 3. The combination of the sliding collar H,

the adjustable links Gr, and brake-blocks D.

In testimony whereof I have signed my name to this specification in the presence ot' two subscribing witnesses.

THOMAS SYMONDS. Witnesses VM. A. STEEL, HARRY SMITH.

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