Editing Alternate action (section)

===Notch wheel===
[[File:Cherry MX Lock -- slider with locking wheel.jpg|250px|thumb|Notch wheel in [[Cherry MX Lock]]]]

This method is described in [http://www.google.com/patents/US3770923 US patent 3770923], filed in 1972 by Cherry. A wheel with three pairs of teeth is affixed to the slider by a post, and this wheel is free to rotate. A lug within the switch rotates this wheel every time the slider is depressed, and on alternate cycles, the wheel engages with a second lug within the switch. The space between each pair of teeth is right-angled, and after engaging with the upper lug, holds the slider down. When the slider is pressed again, the wheel is rotated further, and as it encounters the upper lug again, it is given another push. This rotary approach imparts no noticeable force, and thus leaves the switch completely linear.