Pin-pallet escapement

A Roskopf, pin-lever, or pin-pallet escapement is an inexpensive, less accurate version of the lever escapement, used in mechanical alarm clocks, kitchen timers, mantel clocks and, until the 1970s, cheap watches now known as pin lever watches.

[1] [2] An escapement is the mechanism in a mechanical timepiece that gives the balance wheel pushes to keep it moving back and forth, and releases the timepiece's gears to advance a fixed amount with each swing of the wheel, thus moving the hands forward at a steady rate.

Pin pallet timepieces are usually too cheap to justify repairing, and are usually thrown away when they break down or wear out.

[1][3] The innovative Roskopf watch, which came out in 1876, won awards and was widely imitated, being made in various forms until about 1925.

Quartz technology is gradually replacing the last uses of pin pallet movements in timers and alarm clocks.