US597479A - Friction-clutch - Google Patents

Description

(No Model.)

P. P, CANPIELD.

FRICTION GLUTGH.

Patented Jan. 18,1898

F 'g. E. E INVENTEIR- WITN EEEEE. mmaw @ZMJMW UNITED STATES PATENT anion,

FELIX P. CANFIELD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CLARENCE XV. STETSON, OF NEWTON, MASSACHUSETTS.

FRiCTlON-GLUTCH.

SPECIFIGATION forming part of Letters Patent No, 597,479, dated January 18, 1898.

Application filed May 19, 1897. Serial No. 687,210. (No model.)

To all whom it may concern.-

Be it known that I, FELIX P. CANFIELD, of Boston, in the county of Sufiolk and State of lliassachnsettshave invented certain newand useful Improvements in Friction-Clutches,of which the following, taken in connection with the accompanying drawings, is a specification.

This invention is in the nature of an im- IO provement upon that set forth in the United States Letters Patent granted to me May 19, 1896,No. 560,470, for friction-cutches. In said patented device a severed elastic ring was expanded into frictional engagem cut with r 5 the inner face of an annular flange of the pulley or clutch-body by means of a curved lever pivoted between the terminal shoulders of said ring and extended inwardly beyond the axis of said flange to be actuated by a short shaft projecting through the coveringplate and having an independent bearing therein. Such former device Was Well adapted for large pulleys or clutches, but for those of small diameter a simpler apparatus is very desirable and is herein set forth.

My present improvement is embodied in a pulley or clutch-body having an annular flange with a smooth internal surface concentric with its shaft, and a transversely-severed 3o elastic ring mounted on the carrying-plate within said flange and adapted to he'enlarged into frictional contact therewith, in combination with an eccentric-strap having a radial stem connected to said carrying-plate 3 5 and located between the ends of the severed ring, and with an eccentric Within said strap, ring, and flange, and provided with a projecting member to engage the shipper mechanism, preferably a tubular sleeve surrounding 0 the shaft made integral with the eccentric and spirally grooved to receive the actuatingstuds on the shipper-sleeve. Other novel features are rigid struts or curved projections formed on the carrying-plate, semicircular covering-plates perpendicular to the shaft and secured by screws entering said struts or projections, a peripheral groove in the neck of the eccentric-sleeve to receive the edges of said governing-plates, the severed ring overlapping the periphery of the carrying-plate and supported by studs through the covering and carrying plates, and the sliding shippersleeve provided with a peripherally-adjust able spline not entering the shaft.

In the drawings, Figure l is a longitudinal section of the improved clutch. Figs. 2 and 3 are transverse sections on the line 2 3 of Fig. 1, showing a change of position by partial rotation of the eccentric. Fig. 4 is aside and end view of the adjustable spline. Fi 6o 5 is an elevation of the eccentric and its grooved sleeve, and Fig. 6 a plan of one of the covering-plates.

A represents the rotary shaft, and B the pulley or clutch-body formed with the annular flange B, having the smooth circular inner surface for engagement when the clutch is operated. The outer surface of this flange may carry the driving-belt, or such flange may be formed laterally on a larger pulley, or a complete pulley may be fixed upon the hub shown as part of the body 13 and thus actuated by the clutch.

C is the carrying-plate located within the flange B and formed with an elongated hub C, surrounding the shaft A, to stiffen and support said plate. A key 0 secures the hub and plate to the shaft. Rigid struts or curved projections D, Figs. 2 and 3, are cast integral. with the plate C to strengthen it and support the covering-plates E. These plates are flat semicircular castings secured by screws passing through screw-holes c and fixed in the rigid projections D. Such plates overlap the outer edges of the flange l3 and cover the in- 8 5 closed parts of the clutch mechanism.

F represents the elastic severed ring normally fitting loosely within the flange B and secured to the carrying-plateC by ascrew G, passing through the covering-plate E and an 0 elongated slot f in said ring and entering the carrying-plate C, as in Fig. 1. Such ring is severed at a point opposite to the slot f, and its ends form enlarged shoulders F With parallel surfaces. The inner edge of this ring 5 overlaps the periphery of the carrying-plate on which it is mounted, so as to bear upon the entire inner surface of the flange B frictionally.

Between the shoulders F of the severed 10o ring is the stem II of the eccentricstrap H, such stem being anchored to the carryingplate 0 by the screw G, passing through the covering-plate E and an elongated slot in said stem and being fixed firmly in said carrying plate. The screws G and G therefore secure ered ring and expanding said ring into strong frictional contact with the flange B, as in Fig. 3-. This produces the clutch action and communicates to the shaft A the rotation assumed to be imparted to the pulley B.

The eccentric .I is a part of a peculiar casting (shown in Fig. 3) having a groove 3' concentric with the shaft to receive the inner.

curved edges of the covering-plates E, which stand perpendicular to the shaft and hold the eccentric in true position for its work. Beyond the groove j the casting is prolonged as an enlarged circular sleeve J and is formed with two spiral grooves K to be traversed by the actuatingstuds which give'to the eccentric its limited oscillating motion.- An open space is left within the sleeve J for the m We ment of the part which carries these studs.

L represents the shipper-slide, consisting of a tube arranged between the shaft A and sleeve J and having rigid studs L at one end projecting outwardly into the groo ves K and at the other end formed with two radial flanges Z, between which the shipper-lever (not shown) works. This tube or slide has a longitudinal movement along the shaft, but must revolve with it when the clutch is engaged, and it is desirable to be able to adjust such slide circumferentially. I therefore provide a hollow spline or core on which the slide fits and moves, and provide it with a set-screw by which it may be fixed in position and readjusted by a circumferential movement when desired. As here shown in full lines in Fig. L and dotted lines in Fig. 1, this device is in the form of a collar M, having two longitudinal prongs or splines m fitting in corresponding longitudinal grooves within the tubular slides L, but not entering the shaft A. It is obvious that such splines or an angular core substituted therefor can be adjusted circumferentially of the shaft as they .could not be if fitting into grooves therein as With an ordinary key. A collar N on shaft A keeps the clutch-body B in proper relation to the other parts.

In practice I make the curved struts D of such size as to firmly support the ring F, and I finish the exterior of said ring thereon before it is severed and secure thereby a cylindrical surface of the ring barely fitting Within the flange B. Then I sever the ring, leaving the shoulders F parallel,and by a few hammer blows on its peripherylimpart some elasticity, causing it to cling to the struts when not expanded.

I claim as my invention 1. In afriction-clutch a policy or clutchbody having an annular flange with a smooth internal surface concentric with its shaft, a

carrying-plate, and a transversely-severed elastic ring mounted on said plate within said flange and adapted to be enlarged into clutchin g contact therewith, in combination with an eccentric strap having aradial stem connected to said carrying-plate between the ends of the severed ring, an eccentric located within said strap, ring and flange, and formed with a projecting-member adapted for engagement with a shipper mechanism to actuate the clutch, substantially as set forth.

2. In a friction -clutch, the clutch body formed with an annular flange with a smooth internal surface concentric with the shaft, a carrying plate, and a transversely-severed elastic ring mounted on said plate within said flange and adapted to be enlarged into clutching contact therewith, in combination with an eccentric-strap having a radial stem pivoted to said-carrying-plate between the ends of the severed ring, an eccentric located within said strap and formed with a projecting sleeves-urrounding'the shaft, and shipper mechanism engaging with said sleeve to oscillate the eccentric, substantially as set forth.

3. In a friction-clutch,a clutch-bodyhavin g an annular flange, a radial carryingplate within said flange and provided with rigid struts or projections, and covering-plates secured to said projections, in combination with a, transversely-severed elastic ring adapted to be enlarged into contact with said flange,

flange formed with a central hub adapted to Y be keyed to the shaft and with rigid projecting struts, and semicircular covering-plates perpendicular to the shaft secured on said struts to inclose the clutch proper, in combination with a transversely-severed elastic ring anchored to said carrying-plate and overhanging its periphery so as tobear circumferentially against the entire inner surface of the clutch-flange, an eccentric-strap within said ring and an eccentric surrounding the shaft and formed with a grooved tubular neck adapted to be oscillated by the shipper mechanism, substantially as set forth.

5. In a friction-clutch,the annularly-flanged revolving body and the carrying-plate keyed to the shaft and supporting the expansible clutch apparatus to engage with said body,

in combination with a shipper-sleeve having In testimony whereof I have signed my a sliding movement on the shaft and grooved name to this specification, in the presence of IO longitudinally in its inner wall, and with a, two subscribing witnesses, on this 4th day of oiroumferentially-adjustable core or spline May, A. D. 1897.

having a cylindrical bore to fit the shaft, ribs FELIX P. GANFIELD. or prongs to fit within the shipper-sleeve and Witnesses: a set-screw to fix its position when adjusted, A. H. SPENCER,

substantially as set forth. NVARREN F. GILBERT.

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