صدای چرخ ضامن دار

Bicycle pedal changing gears with a freewheeling ratchet.

Small ratchet reloading.

Small gears ratcheting up (2).

Ratchet mechanism - single turn. (4)

Ratchet mechanism - single turn. (1)

Ratchet mechanism - single turn. (7)

Electric typewriter, Olivetti-Lettera E501 - small plastic gear turning, short ticks. (3)

Ratchet mechanism - single turn. (10)

Ratchet mechanism - single turn. (3)

Electric typewriter, Panasonic R300 - paper wheel spin, ratchets. (2)

Ratchet mechanism - single turn. (5)

Ratchet mechanism - single turn. (9)

Electric typewriter, Panasonic R300 - paper wheel spin, ratchets. (1)

Ratchet mechanism - single turn. (6)

Electric typewriter, Olivetti-Lettera E501 - small plastic gear turning, short ticks. (2)