Lavender Patent Crank and Crank Axle Review

figure 1 section view of crank axle from patent application

Figure 1 gives a sectional view showing a crank and axle complete attached to the frame. Item 1 refers to the crank axle bracket attached to the tubing. Item 2 refers to the axle passing through the said bracket and joined to the right hind crank within the hub (item 3) of the sprocket wheel (item 4) which is accomplished by means of a right and left hand thread.

It will thus be seen that by starting the axle at each end of the hub and then running the sprocket wheel,the two ends of the axle are drawn firmly together and are prevented from turning out again by the square lug on one end fitting into the square socket on the other end of the axle (as shown in Figure 2).

figure 2 close section view of adjustinbg sleeve

Thus it will be seen that it is a very simple matter to remove the sprocket wheel and replace it by one of the different dimensions to change the gear when required. Item 5 refers to the cap or adjusting sleeve which is held in place by a set screw in the lug (item 6). To adjust the bearing it is necessary to loosen the set screw in the lug (item 6) and allow of the sleeve (item 5) being turned to the right or left as required, and then retightening the set screw to securely hold the sleeve.