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RATCHET MECHANISM OF A PENDULUM CLOCKWORK DRIVE

Abstract

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, thereby stopping the wheel. In its back swing, pendulum 1, with its upper pallet b, raises lug c of rocker arm 4, disengaging pawl 5 from ratchet wheel 2. Then the next pin a on wheel 3 strikes pallet d of the pendulum, swinging it to the right again. $2788$RG,FD$

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