Untitled record

Application filed October 17,1895. Serial No, 565,966, (No model,)

To all whom it may concern:

Be it known that I, Austin T. Bascom, a citizen of the United States, residing at Sidney, in the county of Shelby and State of 5 Ohio, have invented certain new and useful Improvements in Bicycle - Crank Attachments, of which the following is a specification, reference being had therein to the accompanying drawings.

i o My invention relates to improved means for attaching the pedal-pin to the pedal-crank of a bicycle; and it has for its object the production of means whereby the pedal-pin may be attached to the pedal-crank in such man15 ner that the leverage of the former may be increased or diminished by the rider while the bicycle is in or out of motion.

The invention consists in certain details of construction and combination of parts, which 20 will first be described in connection with the accompanying drawings, and then pointed out in the claims.

Figure 1 of the drawings is a front elevation of a pedal-crank, illustrating the appli25 cation of my invention, the pedal-pin being shown in the position of greatest leverage. Fig. 2 is a side elevation of the. same. Fig. 3 is a view in elevation, partly in section, of the invention, showing the pedal-pin in the 30 position of least leverage. Fig. 4 is a perspective view of the various parts, shown separately.

Referring to the drawings, A is a pedalcrank, provided at its free end with an en35 larged head 1, on the outer side of which is secured, or preferably formed integral therewith, a disk B, which is preferably of less diameter than the head 1. A small boltopening 2 extends centrally through the disk 40 and head.

C represents a yoke, of a shape substantially as shown, its inner end being of a size and shape to conform to the head 1 when in place thereon, and its outer or free end being 45 adapted to receive the pedal-pin D, on which the pedal E is mounted. The inner end of this yoke is recessed on each side, as at 3 and 4, respectively, these recesses being of slightly greater diameter and depth than the diame50 ter and thickness of disk B. An interiorlyscrew - threaded opening 5 joins these recesses, this opening 5 being of less diameter than said recesses, thus leaving a shoulder G at its inner end and a shoulder 7 at its outer end, for a purpose hereinafter described. 55

F represents a coupling-bolt, the head 8 of which is exactly similar in size and construction to disk B. The part 9 of this bolt, next the head, is screw-threaded, as shown, and is one-half thread longer than the length of 60 opening 5, the threads on this part 9 being adapted to conform to the threads in opening 5. The remaining portion of the bolt F is reduced in size, as at 10, and screw-threaded, this portion being adapted to enter the bolt- 65 opening 2 and be engaged by a nut 11, as shown in Fig. 3.

In assembling the parts the coupling-bolt is passed through opening 5 until the threads on part· 9 engage the threads in that opening, 70 when it is screwed in until the head 8 rests in the recess 4, which is of a size to just receive it. The portion 10 of the bolt is now passed through the opening 2 until the end of portion 9 engages the face of disk B, when the 75 nut 11 is screwed on the outer end of part 10, and the parts are assembled.

The operation of my invention is as follows: Supposing it is desired to put the pedal-pin in the position of greatest leverage, which 80 position is shown in Fig. 1. Now by simply turning the yoke forward (which operation, owing to the fact that the screw-threaded part 9 of the coupling-bolt is one-half thread longer than the interiorly-screw-threaded opening 5 85 in the yoke with which the part 9 engages, causes the yoke to move slightly inward) the shoulder 6 is caused to contact with the disk B until, when the parts assume the position shown in Fig. 1, the shoulder G and disk B 90 are in such close contact that further forward movement of the yoke is impossible. Then when it is desired to put the pedal-pin in the position of least leverage, which position is shown in Fig. 3, by simply turning the yoke 95 in the rearward direction the shoulder 7 is caused to contact with the head 8 of the bolt F until, when the parts are in the position shown in Fig. 3, further rearward movement of the yoke is impossible. As it is only nec- 10c essary to turn the yoke in order to alter the leverage from the maximum to the minimum, or vice versa, it is evident that this operation can be readily and easily accomplished by

558,463 the foot of the rider while the bicycle is in motion. From the fact that the recesses 3 and 4 are of a size to only just receive'the disk B and head 8, respectively, it will be 5 seen that these parts are practically dustproof.