US627601A - Crank-fastening. - Google Patents

Description

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(No Model.)

UNITED STATES I` APATENT OFFICE.

LUCIEN SEYMOUR, OF GENEVA, OHIO, ASSIGNOR TO THE GENEVA CYCLE COMPANY, OF SAME PLACE. A

' CRANK-FASTENING.

SPECIFICATION forming part of Letters Patent No. 627,601, dated June 27, 1899.

' Application filed February 12, 1898; SerialjNo. 670,038. (No model.)

To all whom t may concern.-

Be it known that I,r LUcIEN SEYMOUR, a

- citizen of the'United States, residing atGe-` neva, in the county of Ashtabula and AState of Ohio, have invented a certain new and usefulA Improvement in Crank-Fastenings, ofwhich the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The object of my invention is to provide crank-shaft fastenings for bicycles which shall be cheap in construction, efficient in operation, and neat in appearance and in which the parts may be readily and conveniently detached.

The invention consists in the combination of parts hereinafter describedand definitely enumerated in the claim.

The drawings clearly illustrate my invention. i

Figure 1 is a vertical central longitudinal section through the crank-shaft and bearings.

Fig. 2 isa perspective'view of the end of a crankfarm, the spider, anda portion of the crank-shaft, which parts cooperate and are shown in position for attachment to each other. Fig. 3 is an end View of the invention, as shown in Fig. l, being taken from the righthand end of that figure.

Referring to the parts by letters, A represents the barrel of a suitable crank bracketV the ball-cup B', which the ring C screws onto,V

is a continuation of the thread which screws into the barrel. ball-cups, whereby they may be turned by a suitable Spanner-wrench, while the periphery of the ring C is suitably milled to provide for its turning by the fingers.

In the interior of the barrel is a tube or The ball-cup B has a flange b;

Holes bf are provided in thel sleeve F, which carries the cones E. 'lhese cones-are rigidly secured to the sleeve by being forced onto it against shoulders f thereon. Between the cones 'and the ball-cups roll sets of balls D. Suitable ball-retainers 'b2 are provided in each of the4 ball-cups, as shown, to confine the balls therein when the parts are separated.

When the parts so far described are in position, the bearings may be adjusted and locked without regard to the cranks or the crank shafts, the bearings being entirely self-contained? between the sleeve F and the barrel of the hanger.

The crank-shaft consists of two parts or shafts G G, 'each of which is adapted to be secured at one end to a crank-arm, and has its other end cut od diagonally, as shown in the drawings'at g. These diagonal faces g contact with each other when the shaft is in position, whereby when the portions of the shaft are drawn tightly together they slip on each other slightly, and thus become tightly clamped to the sleeve F. The means for so forcing the two shafts together is furnished by the bolt H, which extends through a longitudinal hole g in the shafts and has at one end a head h and at the other screw-threads which screw through internal threads g4 near the end of the shaft G'. A nut h screws over the projecting end of the bolt and acts as a jam-nut. The two crank-arms and the spider K for the sprocket-wheel L are secured to the crankshafts before the bolt H is inserted. This securing is accomplished' by 'the following means: On each portion of the crank-shaft is formed a iiange g2. This iiange is preferably Iintegral with the shaft, extending from it at right angles. The approximately rectangular Vforniof this flange shown in the drawings is deemed preferable; but it is only essential -a similar recess la', which receives a projection j' on the hub of the crank-arm J. The

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flanges g2 and the projection j and the corresponding recesses are preferably slightl y beveled at their edges to insure a tight engagement. I

The outer ends of the crank-shafts G G are screw threaded, as at g3. On these screwthreads turn conical nuts M, which are adapted to stand in conical depressionsj2 in the hubs of the crank-arms. These nuts, which maybe tightened by the application of a spanner-wrench to notches m in the nuts, lock the crank-arms tightly to their shafts. It will th us be seen that one crank-arm and the spider for the sprocket-wheel may be secured to its shaft and the other crank-arm secured to its shaft independently of each other and independently of the hanger and bearings. When the parts are so secured, the shafts G G are inserted in the sleeve F and the bolt H passed through the shafts and screwed tightly into place and the nut 7L turned on the bolt-head 7l and the head of the nut h covering the corresponding nuts M, and thus hiding them from view. The assembled parts thus present a very neat appearance.

On the inner face of the hub of the crankarm .I' is formed a flange js, whereby a substantiallyannular space is provided between such hub and the bearing parts, in which a felt washer may be inserted, if desired. Provision may be made at the other end of the hanger for a washer between the hub of the sprocket-wheel and the hanger.

In assembling the parts the cup B, carrying its quota of balls secured by the ball-retainer b2, is first screwed int-o place in the barrel A. The sleeve F, with its cones, is then placed in the barrel, and the ball-cup B', with its balls and carryingthe locking-ring C on its periphery, is screwed into the barrel until the bearing is properly adjusted. The locking-ring C is then turned tightly against the end of the barrel. The bearing is thus adj usted and locked. The shaft G is then inserted through the spider and crank-arm J,

and these parts are locked together by the nut M. Similarly the crank-shaft Gl is secured to the crank-arm J. The crank-shafts G and G' are then inserted into the sleeve F, the bolt H passed through them, and the nut h'v turned into place, thus completing the assembling ot' the parts. It will thus be seen that each portion of my crank-shaft and bearing is in reality self-contained, for the balls are held in the ball-cups by their retainers before the ball-cups are screwed into the barrel of the hanger and the cones are permanently secured to the sleeve F, and after that sleeve and the ball-cups, with their balls, have been put in place the bearing is locked without regard to the crank-shafts or cranks. Likewise after the spider has been put on the shaft G and the crank-arm J and nut M put in place this portion of the mechanism is locked together without regard to the rest, and so is the crank-shaft G and its arms J By providing a movable spider instead of one permanently secured to the crank-shaft I furnish means for the attachment to that shaft of sprocket-wheels, carrying their own hubs, or wheels having simply a rim and web portion adapted to be secured to the spider-arms.

I claim as my invention- The combination of a hollow crank-shaft having a thread on its end, a crank-arm having a hub surrounding said shaft and thread, a recess in the outer side of said crank-hub, a nut M screwing onto said shaft and lying within said recess, a screw-threaded bolt projecting through the hollow shaft and a nut screwing onto the end of the bolt and extending over said `nut M, substantially as dcscribed.

In testilnony whereof I hereunto aliix my signature in the presence of two witnesses.

LUCIEN SEYMOUR. Y

lVitnesses:

HENRY MEANS, EDITH IIARTE.

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