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DOUBLE-DETENT RATCHET MECHANISM

Link 1 is held in the position shown by latch 2 and spring 3 while link 5 reciprocates along fixed guide a. Links 1 and 5 can be locked or released independently of each other by means of levers 6 and 4 which turn latches 2 and 7 about axes A and B.
$2756$RG,SD$