Page 233 - Making things move_ DIY mechanisms for inventors, hobbyists, and artists
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Chapter 7 Bearings, Couplers, Gears, Screws, and Springs 211
FIGURE 7-25 Common spiral claw/rachet type clutch (credit: SmallParts.com)
3
An example of a ratchet type clutch is seen in bicycles. It engages the rear sprocket
with the rear wheel when the pedals are moving forward, and lets the rear wheel
move freely when the pedals are stopped or moving backward.
Shaft Collars
Shaft collars, also called lock collars, are like one half of a rigid shaft coupling. You can
use them as mechanical stops or to limit movement on a shaft. They can also be used
as spacers between gears or other components.
As shown in Figure 7-26, shaft collars come in set screw and clamp types, and can be
made of metal or plastic.
