The lengths of the links comply with the conditions: A͞B+B͞C<A͞D+C͞D and A͞C<C͞D<B͞C<A͞D. Link 2 is a circular slider moving along circular guides a-a of radius D͞C and with the centre at point D. When crank 1 rotates about fixed axis A, link 2 oscillates in guides a-a. The mechanism is equivalent to four-bar crank and rocker arm linkage ABCD in which AB is the crank, BC is the connecting rod and CD is the rocker arm.
$1495$SC,4L$