The lengths of the links comply with the conditions: A͞B+B͞C<A͞D+D͞C and A͞B<A͞D<B͞C<D͞C. At the end of link 1 is pin b which slides in movable circular guiding slot a-a of radius C͞B and with its centre at point C. When link 1 oscillates about lixed axis A, slotted link 2 also oscillates (about fixed axis D). The mechanism is equivalent to four-bar double swing linkage ABCD in which link B͞C is the connecting rod and links A͞B and D͞C are rocker arms.
$916$LG,3L$