US446280A

US446280A - blakely

Info

Publication number: US446280A
Authority: US
Publication date: 1891-02-10
Anticipated expiration: 1908-02-10

Description

'.(No Model.) Y sheets-smet 1.

' W. BLAKELY.

GRANK FOR BIGYGLES.

NQ..4.46,2'80. Patented Peb.. 10.1891.

' (No Model.) 2 Sheets-Sheet 2.

W.I BLAKBLY. @RANK FR BICYLBS.

N0.446,28o. Patemdleb. 10,1891.

UNITED STATESV PATENT @erica IVILLIAM BLAKELY, OF B'OURNEMOUTH VEST, ENGLAND.

CRANK FOR BlcYctEs.

SPECIFICATIG forming part of Letters Patent No.'446,280, dated February 10, 1891.

Application led J'uly l, 1890. Serial No. 357,409.. (No model.)

To all whom, t may concern:

Be it known that I, WILLIAM BLAKELY, engineer, of Vernon, Princess Road, Bournemouth IVest,in the county of Hants, England,

have invented new and useful Improvements in the Construction of the Cranks and Crank-k Shafts of Cycles and other Machines and the Bearings Therefor, of which the following is a full, clear, and exact description.

My invention relates to the construction of the cranks and crank-shafts of cycles and other light machines, and is illustrated in the accompanying drawings, forming part of this specification, wherein- Figure l represents a longitudinal section, Fig. 2 a face view, and Fig. 8 a cross-section, (online 3 3, Fig. 1,) of a bicycle-crank arm. Figs. 4 and 5 show longitudinal and crosssectional views of modified constructions of zo crank-axle.

Similar letters of reference indicate like parts in all the figures.

According to my invention I build up the crank of an external shell composed of two 2 5 stamped sheet-steel plates a a upon a core of tough wood b, whereby I am enabled to combine lightness with strength. The plates a a are both stamped up of channeled section, as shown in cross-section in Fig. 3, so that their 3o iiangesbutt-joint along the edges of the crankarm, as at c c, and they are corrugated longitudinally to give increased stiffness. They embrace the wood core, as shown, the whole being firmly united by rivets d. The crankarm is slotted at t', at which point the wood core is replaced or strengthened by metal linings k to take the wear. The ends of the crankaxle e-are longitudinally tinted, as shown in Fig. l, and the parts of plates a a which form 4o the eyes f of the crank-arms are stamped with notched edges corresponding to the utes of the axle, so as when driven onto the ends of the axle they will be securely keyed thereon by the interlocking tintes without the use of any loose' keys. The flutes may continue `throughout the length of the axle e, the flutes at the parts which form the journals being either filled up with agate or other hard material to form a cylindrical journal, as at g, or 5o being left wholly or partially fluted for the purpose of holding lubricant. The utes at the other parts of the axle'or shaft serve to the pedal is mounted, is fitted to slide in the longitudinal slottl in the crank-arm, the edges of said slot being lined with metal 7c, as above mentioned. The pin 7L is carried by a bar l, fitted to slide telescopically within the crankarm, the wood core of which is made hollow to receive it. This barZ is of oblong crosssection, so as to have the necessary transverse strength, and it is surrounded by a spiral spring m, of oval form in section, which is confined between a cross-pin Z at the inner end and a shoulder b on the core of the crankarm, so as to tend to draw the crank-pin inward to its shortest radius. It is shown in its mid-position in Fig. l, and is locked in either of these positions by a spring locking-bolt n, sliding through a transverse slot in the crankarm and adapted to engage with either of three notches o o2 o3 in the edge of the arm Z. The locking-bolt n is drawn into engagement with one of said notches by a spring 1J, and the head of the locking-bolt projects from the face of the crank-arm in such position that it may be conveniently pressed inward to disengage the bolt from the notch in the arm Z by a side motion of the riders foot at the same time that by pressure of the same foot on the pedal the crank-pin may be moved along the crank-arm to a greater radius, or

by relaxing the pressure of the foot the spring m is permitted to act so as to draw the crankpin inward to a less radius, as the case may be, the bolt in either case relooking the sliding bar automatically. Thus the radius of the cranks or pedals may be altered by the rider without dismounting and while the Vehicle is running.

Fig. 4 shows a inode of constructing an axle or shaft of two or more thin steel or other metal tubes r s, shrunk the one on the other and upon a core t, formed of a metal rod of triangular (or it may be crnciform) cross-section.

Fig. 5 shows a similar tubular construction, the outer tube being shrunk on the inner one, which is filled by a core u of hard tough wood,

IOO

such as lance-wood, iron wood, or hickory dried, and forced tightly into the inner tube. By these constructions a light and very stift shaft or axle is produced, which is not likely to spring or bend under the Weight of a heavy rider.

Having now particularly described and ascertained the nature of the said -invention and in what manner the same is to be performed, I declare that what I claim is- 1. The herein-described construction of crank-arms of a shell formed of stamped steel plates clamped upon a wood core, as specified.

2. An improved crank-arm formed of a core and an external shell of sheet'metal and providedwith a notched eye,substantiallyas described.

3. Fluting the axle-journals and filling the flutes-With agate or other hard material, as specified.

4. The combination, With a luted' axle, of a crank formed of a core and a sheet-metal shell and provided with an eye notched to correspond with the utes of the axle, substantially as herein shown and described.

. 5. The combination of a hollow crank-arm,

a bar to which the pedalis connected, fitted toslide in the crank-arm, a spring` for drawing the bar into the crank-arm, and-a springpressed bolt engaging the bar to lock it in position in the said crank-arm, substantially as described.

6. The combination, with a hollow crankarm having its lower end slotted, of a bar to which the pedal is connected, fitted to slide projecting into the slot thereof, a spring snrronnding the bar in the crank-arm, and a spring-pressed bolt for engaging the bar to 'lock it in position in the crank-arm, substantially as described. Y

The foregoing specification of my improvements in the construction of the cranks and crank-shafts of cycles and other machines and.

the bearings therefor signed by lne this 10th day of April, 1890.

WILLIAM BLAKELY. W'itnesses: l

GEO. J. B. NUNKLIN, WV. J. NORWOOD, Both of 17 GracechurchStreet, London, E. 0.,

Notarys Clerks.

35 in the'crank-arm and having its lower end