Raising and clamping means for sliding bolsters

Claim 1

A MOVING BOLSTER PRESS COMPRISING: A BED, WEDGE ENGAGING SURFACES ON THE BED, TRACKS EXTENDING FROM ONE SIDE OF THE BED OUTWARDLY AWAY FROM THE BED, FURTHER TRACKS EXTENDING AWAY FROM THE OPPOSITE SIDE OF SAID BED FROM, AND IN ALIGNMENT WITH, THE FIRST SAID TRACKS, A MOVING BOLSTER, WEDGE ENGAGING SURFACES ON THE BOLSTER DISPOSED IMMEDIATELY ABOVE CORRESPONDING WEDGE ENGAGING SURFACES ON THE BED WHEN THE BOLSTER IS IN ITS OPERATIVE POSITION, TRANSVERSE SHAFTS ON SAID MOVING BOLSTER, WHEELS ON SAID TRANSVERSE SHAFTS ENGAGING SAID TRACKS, WEDGE MEMBERS EACH HAVING A PAIR OF VERTICALLY SPACED WEDGE SURFACES MOVABLE BETWEEN THE WEDGE ENGAGING SURFACES OF SAID BED AND SAID BOLSTER WHEN SAID BOLSTER IS DISPOSED ABOVE SAID BED IN ITS OPERATIVE POSITION, SAID WEDGE MEMBERS HAVING A RELEASED POSITION, FURTHER TRACKS ON SAID WEDGE MEMBERS AND ALIGNED WITH SAID TRACKS EXTENDING AWAY FROM THE SIDES OF THE BED WHEN SAID WEDGE MEMBERS ARE RELEASED, WEDGE CYLINDERS LINKED TO SAID WEDGE MEMBERS AND OPERABLE TO MOVE SAID WEDGE MEMBERS IN THE DIRECTION OF SLOPE OF THEIR SAID WEDGE SURFACES, AND SAID WEDGE ENGAGING SURFACES ON SAID BED AND BOLSTER BEING COMPLEMENTARY TO SAID WEDGE SURFACES OF SAID WEDGE MEMBERS WHEREBY SAID WEDGE MEMBERS ARE OPERABLE EITHER TO LIFT BOLSTER FROM THE BED OR LOWER IT THERETO UNDER CONTROL OF SAID WEDGE CYLINDERS.