Hinged bottom 1 turns about fixed axis A. Link 3 is connected by turning pairs B and C to hinged bottom 1 and eccentric cam 2. The lever with eccentric cam 2 turns about pin C. Cam 2 slides along contoured member 4 and locks the hinged bottom when the lever is turned counterclockwise. The lock is adjusted by screw a.
$328$SL,SD$