US564958A - X xx xx xx x - x - - x -x xx xx - Google Patents

Description

4 2 Sheets-Sheet 1. I'. C. HOLMES. GRANK SHAFT.

Patented July-28, 1896.

(No Model.)

' 2 sums-sheet z.

F. C. HOLMES. GRANK SHAFT.'

Patented July Nix 11W N UNiTnn Sterns ffnfrsnr @risica FRANK c. nomine, or 'scanne-on `resinsvia-fanLA., -fissicnoa' er ninnc'r AND Massin aesinet-rends, Torun. incitatif/inns' iviisnt consi-infr,

OF PENNSYLVANIA.

f ceANKfss'Arn SPECIFICATION forming partv of Letters Patent No. 564,958, dated July 2S, i896. Application filed Octobei' 31, 1895. Serial No. 567,492. (No model.)

To @ZZ whom it mag/,coleccion i l Be it knovrn that I, FRANK C. llOLMEs., of Scranton, in the county of llackawanuaA and State of Pennsylvania, have invented certain new and Vuseful Improvements in Crank- Shafts; and I do 'hereby declare that the following is a full, clean, and exact description thereof,`reference being had tothe accompanying drawings, andto the letters of reference Io' marked thereon, which form part of this speci ication. f

This invention is an improvement inthe crank-shafts and in the connections of the cranks to the shats'in bicycles, die.; and it consists in the novel construction and-coml bination of parts hereinafter claimed, the bestform of the invention now known to me beinghereinafter described, and-shown in the accompanying drawings, in which- Figure l is a centrallongi-tudinal section through the barrel of a bicycle-frame, showing the crankshaft and cranks in full lines.- Ei g. 2 is a ongitudinal vertical section through Fig. l. Fig. 3 is a detail end or side View of the sprocket-crank; Fig. 4C, a transverse section on line e 4, Fig. 3, Fig. 5 isa detail section similar to Fig.' 2, showing a modified form of the-invention.` Fig. 6 is a detail.

*Referring* to the accompanying drawings by letters, A designates the barrel portion of the frame ofa bicycle iof any suitable construction. A sleeve B is supported and centered Within the barrel byball-bearings C, as shown in the drawingsg or in any other 3 5 desired manner: y The ends bof sleeve B projeet beyond the ends ofv the barrel and are threaded exteriorly, as shown, the threads on opposite ends being respectively right and left hand.

`Through sleeve B and fitted closely therein, so astohavc the least possible lateral play, is the crank-shaft D, which is preferably formed of one piece and projects at' both ends slightly beyond the ends of the sleeve. The ends of the crank-shaft are preferably tapered 4on opposite sides, as at d, to tit into correspondingly tapered sockets e in the shown in Figs. l and 2.

`then removed, and the cranks will be found 7o bosses of the pedal-cranks E, and these ilat-v tlsggeditapered sockets vge clear through to the i,

milliitrces oi? the cra :iks and the ends of j the shaft come ilush with the outside faces,

in this way permitting a perfect and strong fit to be'made .between the' differentV parts. The hubs ofthe cranks are large and extend backward from sockets c', which are threaded 5 5 to 'lit over the threaded ends of 'the sleeve l5,

as shown.

In assembling the parts sleeve l is first centered and supported in the barrel on suitable bcarings, and is locked by means of the 6o ordinary key Z. (Shown in Fig. 2. Shaft D is then peti-nto the `sleeve-and the cranks are slipped on the ends of the shaft and simultaneously turned in sanie direction, so as to screnr upon the ends oi sleeve l5, the cranks being thus drawn toward each other bythc screwthrcads until the tapered ends of the shaft it into the sockets e of the cranks, as The locking-key is to be iirmly'mounted on and fastened to the shaft D, the sleeve B serving both to 'unite the cranks and to ybind `them on the ends of the crank-shaft.

It'will be observed that all side or literal 7 5 strain which might be exerted on the threaded ends of the sleeve if the shaft Was removed is obviated by the close iitting between the cranks and crank-shaft and crank-shaft and sleeve.

One of the most important features of the invention is the fact that the cranks are directly fastened to'. the shaft and that the strain from one crank to the other is exerted through a solid shaft and not upon the threads or sleeve, and that there is oniy one long sleeve between the two cranks, which draws the cranks together, and the sockets are so strongly constructed that they cannot be easily injured by a fall of the Wheel. 9o

The sleeve drawing the cranks upon then tapered ends of the vcrank-shaft 'makes the joints so. close that there is no play of the, cranks upon the shaft or in relation to eachI other, and so long as the sleeve is free to revolve in the barrel it will be impossible for the cranks to loosen or turn off, for the cranks are engagedV by oppositely-leading screw-threads, and being firmly united to the crank-shaft the tapered sockets they cannot be turned i131.

" tion is to secure the cranks on the crankshaft ueeiwieetly of nach other unless the sleeve ne tricked. l do not, however, limit myself to the use of in pered ends on crank-shaft and tapered soci-:ets in the frank-bosses. They are easy to-droi-i-forge, butt-he essential feature is to 'prevent rotation of the cranks on the shaft.`

The employment of' a solid shaft, though not essential, is obvionsly a great advantage inpoint of strength and economy of construction, and all the parts are such that they can be easily drop-forged by ordinary tools, and can be assembled Without special tools.

The construction described is simple, very stron g, durable, and economical, and the parts so constructed, when properly assembled, appear and are as stiff asA if made of a single piece of metal. l

As shown, cnc of the cranksis forged `with arms E radiating from its boss, to which a sprocket-wheel rini F can be attached.

In Fig. 5 I have illustrated a modification Y of the construction shown in Fig. l, by making the shaft integral with or Welded to one of the cranks. The other parts and connec` tions remain the saine, however.

I do notliinit'inyself to the precise construction herein shown and' described, as Various modifications may be made therein While retaining all the essential features of myinvention. l v

v One of the principal features of the inyen-` by means of an internal bond, doing away with pins and keys between the cranks .and crank-shaft and yet putting all the strain of rotation of cranks directly upon the crankf shaft.

llaving thus described my invention, what 4o I therefore claim as new, and desire to secure 'by Letters 'Patent thereon, is-

l.. In a bicycle the ccnihination of a crank and crank-shaft, said crank-shaft having a V lthe crank-shaft, so that the end of shaft comes iinsh with face of crank, With a long sleeve closely fitted to and surrounding the crankshaft and having oppositely-screw-threaded ends fitted into sockets on back. of the cranks whereby the cranks are firmly held onthe crank-shaft, all substantially as and for the purpose described.

2. In a bicycle, the combination of the crankshaft havingangular ends, and the detachable crankshaying sockets in their bosses fitting the ends of the shaft; Witha sleeve fitted on the shari; and having oppositelythreaded ends cn gag-in g correspondingtlneaded enlargements of the sockets inthe bosses of the' cranks, whereby the cranks are drawn. toward each other and bound on the shaft, all substantially as and for the purpose described.

The combination ,of the barrel, the rotatablel sleeve mounted therein, projecting be yond the ends thereof and oppositely threaded on its projecting ends and the shaft fitted in the sleeve and projecting beyond the ends thereof; with the ,cranks tted onthe ends of the shaft but notfrotatable thereon; having internally-threaded sockets in their bosses .engaging .theends of the-sleeve whereby the cranks are bound together an d upon the shaft,

'suiestantiallyy as described.

In testimony that I claim the foregoing as nyoWnI ax my signature in presence of two witnesses.

. FRANK (i. HOLMES. Vtitnesses: JAMns-R. MANSFIELD,

T. H. ALEXANDER.

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