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RATCHET MECHANISM OF A PENDULUM CLOCKWORK DRIVE

A clockwise torque is applied by weight Q about fixed axis A to pin wheel 3 which is rigidly attached to ratchet wheel 2. Pendulum 1 oscillates about fixed axis B and is turned counterclockwise by one of the pins a carried by pin wheel 3. This releases pawl 5 of rocker arm 6 in double-swing linkage CDEF. Rocker arms 6 and 4 turn about fixed axes C and F. Pawl 5 engages a tooth of ratchet wheel 2, …