Patent ID: 7223084
Filing Date: 2007-05-29
Classification: B29C

Abstract:
1. An electric motor driven toggle mold clamping device comprising a ball screw shaft rotating by an electric motor, a ball nut member screwed together to the ball screw shaft to advance and retreat freely with rotation of the ball screw shaft, and a cross head fixed to the ball nut member, wherein the electric motor driven toggle mold clamping device comprises, a cylindrical or polygonal cylindrical member attached to the cross head and, which has a cylindrical or polygonal cylindrical body with a size capable of receiving the ball screw shaft with a gap maintained while advancing and retreating, the cylindrical or polygonal cylindrical member attached to a front portion of the cross head concentrically with the ball screw shaft, and grease disposed in the gap and said cylindrical or polygonal cylindrical member being provided with an opening communicating with said gap for discharging the grease from said opening.