US788810A - Safety-clutch. - Google Patents

Description

No. 788,81@ PATBNTED MAY 2, 1905.

A. A. AMBLER.

SAFETY GLUTGH.

APPLIUATION FILED MAE. 1a. 1904.

3 SHEET-B-BEBBT 1.

we l n www PATENTED MAY 2, 1905.

A. A. AMBLER.

SAFETY CLUTCH. APPLIUATION FILED MAR. 19, 1904.

SSHEETS-SHBBT 2.

PATENTED MAY 2, 1905.

A. A. AMBLER.

SAFETY CLUTCH.

APPLIGATIUN FILED MAR. 19, 1904.

1 wanton rmrd J'mZer,

Eatented May Q, 1905.

UNITED STATES PATENT OEEICE.

ARTHUR A. AMBLER, OF SPRINGFIELD, OI-IIO, ASSIGNOR TO THE FOOS MANUFACTURING COMPANY, OF SPRINGFIELD, OHIO, A CORPORA- TION OF OHIO.

SAFETY-CLUTCH.

SPECIFICATION forming part or' Letters Patent N o. 788,810, dated May 2, 1905.

Application filed March 19,' 1904. Serial No. 198,931.

To @ZZ whom it may concern:

Be it known that I, ARTHUR A. AMBLER, a citizen of the United States,residing at Springfield, in the county of Clark and VState of Ohio, have invented certain new and useful Improvements in Safety-Clutches, oi which the following is a specification, reference being h ad therey in to the accompanying' drawings.

This invention relates to safety-clutches, and has for its object to provide a friction clutch or coupling designed primarily for use in connection with crushing or breaking rolls, which clutch or coupling will yield in case hard objects enter the rolls and will thereby prevent injury to the rolls or transmission-gearing.

To these ends my invention consists in certain novel features, which I will now proceed to describe and will then particularly point out in the claims.

In the accompanying drawings, Figure l is an elevation of a breaker or crusher having my improvement applied thereto. Fig. 2 is a longitudinal :sectional view of the clutch or coupling. Fig. 3 is a side view et' the driving-sleeve detached. Fig. 4 is an end View of the same. Fig. 5 is a perspective view oi the driving-pinion detached. Fig. 6 is a perspective view of the friction-sleeve detached. Fig. 7 is a perspective view of one ot' 'the members oi the abutment-collar detached, and Fig. 8 is a perspective View ot' the other member oi' the abutment-collar detached.

In the accompanying drawings I have illustrated my invention as applied to the driving mechanism of a breaker or crusher employed in conjunction with grinding-mills, although the invention is of course capable of use wherever a yielding safety coupling or clutch may be necessary.

In the said drawings, l indicates the breaker, which has a driving-shaft 2, by means of which the breaking rolls are driven. In breakers of this class there is danger of breakage of the rolls or of the driving-gears by reason of the accidental entry into the breaker of hard substances-such as bolt-nuts, nails, or the like-and for this reason such breakers have to a large extent been driven by belts and pulleys in order to take advantage'o'f the slipping or Iiying oil' of the belt when such an obstacle enters the breaker, although in other respects a gear-drive is more advantageous'owing to its positive nature, which is more suited to the character of the work to be done by the breaker.

The main object of my present invention is to provide a construction whereby the breaking-rolls may be driven by gearing, at the same time making provision for permitting' the driving-train to slip in case a hard object enters the breaker, thus preventing injury to the rolls or gearing.

In the specilic embodiment of my invention shown in the accompanying drawings, 3 indicates a gear-wheel mounted on the drivingshat't 2 oi the breaker, and fl indicates the main shaft ol2 the mill, driven by a belt passing around the pulley 5 thereon. On the shaft L is secured a driving-sleeve 6, which is held in position in any suitable manner-Jas, for instance, by means of a set-screw 7. This driving-sleeve is provided at one end with a flange or collar 8, its other end being externally threaded, as indicated at 9. Upon this sleeve is secured a friction collar or block 10, constructed, preferably, of wood or other fibrous frictional material and having' the form of a truncated cone, with an aperture therewith to cause it to tit the sleeve 6. It is placed in position on said sleeve so that its larger end abuts against the collar 8, which it slight] y exceeds in diameter, and is held in position by means or' screws 11 passing through said eollar and screwing into the body of the frictionsleeve.

12 indicates the drivingpinion, which meshes with the g'ear 3 and which is provided with a frusto-conical bore 13 to tit the correspondingly-tapered outer surface of the friction-sleeve 10.

14 indicates a coiled spring encircling the sleeve 6 and bearing at one end against the pinion l2 to force the same into frictional engagement with the sleeve or block l0. The

other end of the spring 1li bears against an abutment-collar which is composed of two members 15 and 16. The member 15 is threaded internally to fit upon the threaded portion 9 of the sleeve 6 and may be provided with a set-screw 17, by means of which it may be firmly locked in position on said sleeve. The member 15 is further provided with an annular flange 18, extending over and encircling the member 16, said flange being provided with a plurality of notches or apertures 19, spaced about the same. The member 16 fits loosely on the sleeve 6 and is provided with a screw 20, which is adapted to engage any desired one of the notches 19.l Said member 16 is also provided with an annular flange 21 to inclose and form a seat for the abutting end of the spring 14` and with radial lugs 22, by means of which itmay be more readily rotated. The abutting faces of the members 15 and 16 are provided with semicircular caminclines 23, (shown more particularly in Figs. 7 and 8,) so that rotation of the member 16 relatively tothe member 15 will force the former away from the latter, and thereby compress the spring 14.

rlhe device thus constructed operates in the following manner: The parts being assembled in the manner shown in Figs. 1 and 2, thedriving-pinion 12 is held by the spring 14 in frictional engagement with the frictionsleeve 10, so that power will be transmitted from the shaft 4 to the breaker to operate the latter. In case any hard substance enters the breaker the pinion 12 will slip upon the friction-sleeve 10,1thus permitting the shaft 4 to continue to rotate, while the breaker and its driving-gear remain stationary, thereby preventing breakage ofthe parts. The frictional engagement ofthe pinion and friction-sleeve may be regulated by adjusting the pressure exerted by the screw 14 through the medium of the abutment-collar. Under ordinary circumstauces'the member 15 acts as a fixed collar, and the spring is adjusted by removing the screw 20'and turning the member 16 to a position which will give the desired compression to the spring. The member 16 is secured in its new position by replacing, the screw 20, engaging it, of course, with another one of the notches 19. As occasion requires this operation may be repeated. In course of time, however, the spring 14 will become set by long use andwill require more taking up than is provided by the adjustment of the collar 16 relatively to the member 15. When this occurs, the member 15is turned upon the sleeve 6 in a direction such as to move it toward the pinion 12, the set-screw 17 being released in case it is employed. This effects a movement of the entire abutment' toward the spring and restores or increases'its original compression. The member 15 may then be secured by the set-screw 17, and 1n case further compression of the spring becomes necessary it may be effected by adjusting the collar 16 relatively to the member 15 in the manner already described. By reason of this construction great nicety of adjustment of the frictional engagement of the driving-pinion with the friction-sleeve is obtained` and this adjustment may be varied as desired to suit different circumstances.

I-do not wish to be understood as limiting myself to the precise details of construction hereinbefore described and shown in the accompanying drawings, as the same may obviously be modified without departing from the principle of my invention. For instance, although I have described the sleeve 6 as a driving-sleeve and have referred to the pinion 12 as a driven part it is obvious that these relations depend entirely upon the point to which the driving power is applied, and it would constitute no departure from the invention if these relations were reversed. Furthermore, it will be seen that while the employment of the sleeve 6 is advantageous in that it enables me to construct and assemble the device as a whole separate from and ready for application to a driving-shaft said sleeve might be omitted without departing from my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is#

1. A safety coupling or clutch, comprising a driving member provided with a conical f riction-sleeve, a driven member havinga bore tapered to lit said sleeve, a coiled spring encircling the driving member and bearing at one end against the driven member to force it into contact with the friction-sleeve, and a two-part abutment for the other end of said spring mounted on the driving member and fixed relatively to said driving member when in operation, said abutment being adjustable as a whole longitudinally of said driving' member and comprising two members or parts, one of which is adjustable relatively to the other, substantially as described.

2. A safety coupling or clutch, comprising a driving member provided with a conical friction-sleeve, a driven member having a bore tapered to lit said sleeve, a spring encircling the driving member and bearing at one end against.

the driven member to force it into contact with the friction-sleeve, andan abutment for the other end of said spring comprising two parts, one a collar normally secured to the driving member, and the other, against which the spring bears, being a collar revoluble relatively to the first-'mentioned collar, the abutting faces of said collars being' provided with cam-inclines, and means for preventing relative rotation of said collars, substantially as described.

3. A safety coupling or clutch, comprising a driving member provided with a conical friction-sleeve, a driven member having a bore tapered to lit said sleeve, a spring encircling the IOO IIO

vessie driving member and bearing at one end against the driven member to force it into contact with the friction-sleeve, and an abutment for the other end of said spring comprising two parts, one a collar normally secured to the driving member and the other, against which the spring' bears, being a collar revoluble relatively to the first-mentioned collar` the abutting faces of said collars being provided with cam-inclines, and means for preventing relative rotation of said collars, said abutment being adjustable as a Whole longitudinally of the driving member, substantially as described.

4. In a safety coupling or clutch of the character described, the combination, with a driving member, of a spring-abutment comprising tvvo collars, the one normally secured on the driving member and having an annular iiange provided with a plurality of notches, the other loosely mounted on the driving member and provided With a screw to engage any one of said notches, the abutting faces of said collars being provided with cam-inclines, substantially as described.

5. In a safety coupling or clutch of the character described, the combination, with a driving member having a threaded portion, of a spring-abutment comprising a collar threaded to fit the threaded portion of the driving member, and provided with means for securing it in position thereon, and a second collar loosely mounted on the driving member so as to be capable of rotation relatively thereto, the abutting faces of said collars being provided with cam-inclines, and means for securing the second collar against rotation relatively to the other parts, substantially as described.

6. A safety coupling or clutch, comprising a driving-sleeve adapted to be secured on a shaft, a conical frictionsleeve secured on said driving-sleeve, a driven member mounted and longitudinally movable on said driving-sleeve, and having a bore tapered to lit the frictionsleeve, a coiled spring encircling said drivingsleeve and bearing at one end against the driven member, and an abutment for the other end of said spring mounted and longitudinally adjustable on the driving-sleeve, substantially as described.

7. A safety coupling or clutch, comprising a driving-sleeve provided with a circumferential flange, a conical friction-sleeve litting on said driving sleeve and abutting at its larger end against said flange, screws passing' through said flange into said friction-sleeve to hold the same in place, a driven member having a bore tapered to fit said sleeve, a spring coiled around the driving-sleeve and bearing at one end against said driven member to force it into contact with the friction-sleeve, and an abutment for the other end of said spring mounted and longitudinally adjustable on the driving-sleeve, substantially as described.

In testimony whereof I aiiix my signature in presence of two Witnesses.

ARTHUR A. AMBLER. Witnesses:

IRVINE MILLER, GERTRUDE YOUNG.

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