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Figure 2: A) rotating part of trainer and B) apparatus to attach to trainer. 

GEAR REDUCTIONS

The first step in reducing the mechanism speed was to use two bike gears with a ratio of 4:9.5 (Fig. 22A & 2B). It was difficult to fit shafts into these gears. I employed hot glue for this task. I attached Image RemovedImage Removed. I attached the bike gears onto a board, but I couldn't drill holes and attach shafts straight enough for the gears to spin evenly, so the chain kept falling off. I eventually decided to abandon that part of the mechanism and focus on the remaining gears and four-bar.

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Figure 3: A) The small gear driven by the bike trainer, B) The larger bike gear driven by the small gear and driving a lanwnmower gear, and C) a schematic of the first gear reduction. 

The second two gear reductions used the lawnmower gears, which were easier to install (Fig. 4, Fig. 5).

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Figure 4: Second gear reduction; the lawmower gears are driven by the larger bike gear. 

Figure 5: The second and third gear reductions. The final gear, the large lawnmower wheel, serves as link two for the parallelogram four-bar.