Abstract

A spiral gear converts reciprocating motion into rotational motion or rotational motion into reciprocating motion. An interface travels along a spiral such that, as the interface is displaced in a first linear direction, the spiral is caused to rotate clockwise, and as the interface is displaced in a second, opposite linear direction, the spiral is cause to rotate in a counterclockwise direction.

IPC Classes  ?

• F16H 25/12 - Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation along the axis of rotation, e.g. gearings with helical grooves and automatic reversal
• B62M 1/32 - Rider propulsion of wheeled vehicles with reciprocating levers, e.g. foot levers characterised by directly driving the wheel axle, e.g. by using a ratchet wheel