Patent ID: 6851942
Filing Date: 2005-02-08
Classification: B29C

Abstract:
1. A platen clamping unit for an injection molding machine, comprising: a moving mold mounting plate: a fixed mold mounting plate; a spindle drive for displacing the moving mold mounting plate relative to the fixed mold mounting plate, said spindle drive including at least one threaded spindle having one end configured as a piston rod, and an electric motor; a clamping force unit for generating a clamping force, said clamping force unit including at least one hydraulic piston and cylinder unit which is fitted in one of the mold mounting plates and has a cylinder and a piston, which is guided in the cylinder, wherein the piston rod of the threaded spindle supports the piston of the hydraulic piston and cylinder unit; and an anti-rotation mechanism acting on one end of the piston and having an actuating head to allow a turning of the threaded spindle, when the anti-rotation mechanism is released.