Twistgrip

Drawings from 1884 showed a twist grip belt tensioner, complex steering linkage and used a belt drive. The working model had a simple handlebar and used a pinion gear drive.

Patent drawing from US Patent 765138 which was held by Indian

A twistgrip is a handle that can be twisted to operate a control. It is commonly found as a motorcycle's right handlebar grip to control the throttle, but is sometimes found elsewhere, such as on a bicycle as a gearshift, and in helicopters.

单词	Twist grip
释义	Twist grip 英语百科 Twistgrip A twistgrip is a handle that can be twisted to operate a control. It is commonly found as a motorcycle's right handlebar grip to control the throttle, but is sometimes found elsewhere, such as on a bicycle as a gearshift, and in helicopters.
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Twist grip

Twistgrip