US628173A

US628173A - Pedal-crank extension attachment.

Info

Publication number: US628173A
Application number: US68084598A
Authority: US
Inventors: John B Young
Original assignee: Individual
Current assignee: Individual
Priority date: 1898-05-16
Filing date: 1898-05-16
Publication date: 1899-07-04
Anticipated expiration: 1916-07-04

Description

No. 628,l73., Patented July 4, l899.--

J. B. YOUNG. PEDAL CRANK EXTENSION ATTACHMENT.

, filo" Modal.)

UNITED STATES PATENT OFFICE.

, JOHN B. YOUNG, OF CHICAGO, ILLINOIS.

PEDAL-CRANK EXTENSION ATTACHM ENT.

SPECIFICATION forming part of Letters Patent No. 628,173, dated July 4, 1899. Application filed May 16,1898. S ria1N 680,845. (N0 model.)

To aZZ whom it may concern.-

' Be it known that I, JOHN B. YOUNG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Pedal-Crank Extension Attachments, of which the following is a specification.

My invention relates to a pedal-crank extension attachment which may be employed in connection with the pedal-cranks and pedals of common construction for the purpose of securing an increased leverage where such increased leverage is desired.

My object is to provide an extension attachment for crank-arms which may be cheaplymanufactured and readily applied to cranks now in common use, thereby rendering it possible for the wheelman at small expense to convert his wheel into one with extensible cranks. When it is not desired to use the increased leverage, the extension attachments may be quickly removed, and the cranks are then left in their ordinary form,with no attachment or securing parts whatever to encumber them. Thus the rider may, when the roads and wind are favorable, make a long run us ing the cranks without the extensions, but in making the return trip the wind may be against the-rider or the roads in poor condition, when the extensions may be slipped upon the cranks and used to the greatest advantage.

In the accompanying drawings, Figure 1 is a View of an ordinary pedal-crank equipped with my improved extension attachment, the outer side of the crank being toward the left I side of the sheet; Fig. 2, a similar view of the outer side of the crank Fig. 3, a broken sectional view taken on line 3 of Fig. 2, a fragment of a pedal being shown in place attached to the extension; Fig. 4, an inner face view of the extension attachment, and Fig. 5 an outer face view of the same.

A is the pedal-crank, provided at its inner end with a crankshaft-receiving perforated head A and at its outer end with a pedal-pinreceiving perforated head A B is the extension attachment, comprising, preferably,a portion B,provided with a crankhead-receiving circular depression 3 and a screw-bolt-receiving perforation s, a pedalbearing head B provided with a pedal-pinreceiving perforation r, and a shank B provided with a rectangular opening 19 and at its extreme end with a curved bridge-piece p. The shank B is preferably offset somewhat from the portion B, as shown in Fig. 1, so'that the bridge-piece p bears on the side of the crank-arm opposite to the face of the crankhead A which bears against the depressed circular surface 5.

To apply the attachment to a pedal-crank, the pedal is first removed from the head of the crank, and the crank-head is then inserted through the rectangular perforation p of the shank B from the side of the attachment opposite to that shown in Fig. 4. The crank is then given a quarter-turn and brought into substantial alinement with the extension,with the head of the crank fitting into the circular recess and the crank-arm itself fitting into the concave surface of the bridgepiece p. The extension is secured in place by means of a screw-bolt or threaded stud C of the same diameter and thread pitch as the shank of the pedal-pin and of sufficient length to extend through the perforation s and screw into the outer crank-head. The pedal-pin D of the pedal D is then screwed into the perforation r of the pedal-bearing extension B and the transformation is complete.

It will be observed that the only portion of the attachment which projects inward beyond the surface of the crank-arm is the comparatively thin bridge-piece p. Inasmuch as the clearing-space between the crank-arm andframe is small the peculiar manner of attachin g the extension to the crank-arm is of great advantage in this connection, as well as for its simplicity and the readiness with which it is attached to the crank-arm itself.

Minor changes in details may be made without departing from the spirit of my invention, the essential feature of which consists in the lever-like connection between the attachment and the crank-arm-that' is to say, I regard as within the spirit of myinvention an attachment provided with a crank-head-receiving portion, a pedal-bearing head, and a shank provided with means for engaging the crankarm. I

What I claim as new, and desire to secure by Letters Patent, is

1. Acrank-arm extension attachment,comprising a recessed crank-head-receiving portion, a pedal-bearing perforated head carried thereby,a shank extending from the crank: head-receiving portion, and means on said shank for engaging the crank-arm and fixing the extension rigidly to the crank-arm, substantially as and for the purpose set forth.

2. A crank-arm extension attaehn1ent,colnprising a recessed crauk-head-receiving portion, a pedal-bearing perforated head carried thereby, and a shank extending from the crank-head-receiving portion provided with a rectangular-shaped perforation and below said perforation and at the inner side of the shank with a curved bridge-piece, substantially as and for the purpose set forth.

3. The combination with a pedal-crank supplied at its outer end with a threaded perforation, of an extensionattachment for the crank-arm provided at its outer end with a threaded perforation of like diameter and pitch,a pedal supplied with a pedal-pin having a threaded shank adapted to fit either of said perforations, a perforated recessed portion on the attachment for receiving the outer crankhead, a screw-bolt. of sufficient length and diameter to extend through said recessed portion and screw into the threaded crank-head to secure the attachment to the crank when its use is desired, and means acting with said bolt connection to render said extension rigid with relation to the crank, substantially as described.

4. The combination of a pedal-crank supplied at its outer end with a threaded perforation, an extension attachment for the crank-arm provided at its outer end with a threaded perforation of like diameter and pitch,a-pedal supplied with apedal-pin having a threaded shank adapted to fit either of said perforations, a perforated recessed portion on the attachment for receiving the outer face of the outer crank-head, a shank on the attachment provided with crank-arm-engaging means, and a screw-bolt of sufficient length ,and diameter to extend through said recessed portion and screw into the threaded crankhead to secure the attachment to the crank when its use is desired, substantially as described.

5. The combination with a pedal-crank supplied at its outer end with a threaded perforation, of an extension attachment for the crank-arm provided at its free end with a threaded perforation of like diameter and pit(-h,a pedal supplied with a pedalepin having a threaded shank adapted to fit either of said perforations, and a threaded stud of the same diameter and thread pitch as the pedal-pin shank serving to secure the extension to the crank, substantially as and for the purpose set forth.

JOHN B. YOUNG.

In presence of- J. H. LEE, DAN. W. LEE.