When piston 1 is moved to the left by the action of fluid delivered to the right end of its cylinder, motion is transmitted through crosspiece 2 to four levers 3. As the levers turn, they clamp bearing caps 5 against plate 6 which also serves to locate the caps radially. At the same time, two spring-loaded plungers 7 hold the end faces of the caps against body 4 of the fixture. The caps are released when piston 1 is moved to the right by spring 8.
$3985$LHP,FD$