Retarder device for retrograde mechanism controlling e.g. hand, of clock, has lever driving rod in connection with piston that compresses air in chamber during return movement of piston to slow and dampen movement of hand or indicator

摘要

The device has a lever (4) with a jaw (4A) that is in contact with a cam (3) under the pressure of a spring (5). The lever drives a rod (7) in connection with a piston (8) and with a pinion (6). The piston is moved in a chamber (11). The piston compresses the air in the chamber during the return movement of the piston to slow and dampen the movement of a hand (10) or an indicator.