A safety device used by workers climbing
ladders fixed to high structures
consists of a rail attached to the ladder and a
sleeve that can slide on the
flange of the rail. A chain connects the
worker’s belt to the end of an
eccentric cam that can be rotated about an axle
attached to the sleeve at C.
Determine the smallest allowable common
value of the coefficient of
static friction between the flange of the rail,
the pins at A and B, and the
eccentric cam if the sleeve is not to slide down
when the chain is pulled
vertically downward.
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