Metal-tube extrusion press

Claim 1

A metal-tube extrusion press, comprising: an extrusion cylinder, a main extrusion piston slidably in the extrusion cylinder, a crossbeam carried for displacement by the main extrusion piston, a press ram carried by the cross beam, a piercing-mandrel, a piercing-mandrel crossbar locating the piercing-mandrel in position and slidable within the crossbeam, means located in the main extrusion piston for independently moving the piercing-mandrel crossbar, lateral extensions of the piercing-mandrel crossbar projecting out of the crossbeam, abutment rods rigidly connected to the extrusion cylinder and extending in the direction of extrusion through the lateral extensions of the piercing-mandrel crossbar, an axially fixed abutment sleeve rotatably mounted in each lateral extension of the piercing-mandrel crossbar around the respective abutment rod, and an abutment collar fixedly secured to the end of each abutment rod remote from the extrusion cylinder, each abutment sleeve having internal abutment means and each abutment collar being provided with complementary external abutment means, and each abutment sleeve being rotatable between a first position in which the abutment means thereon are out of alignment with the abutment means of the respective abutment collar to permit the sleeve to slide over the collar, and a second position in which the collar and sleeve abutment means are aligned to prevent the sleeve from sliding over the collar.