Patent ID: 7309223

Claim:
An extrusion head device which comprises a fixed head part and a movable head part, the fixed and movable head parts being provided to separate an extrusion passage along a longitudinal direction, the movable head part being pivotally supported to the fixed head part to be rotationally movable, the extrusion passage being opened and closed by rotationally moving the movable head part, the fixed and movable head parts being brought into tight contact with each other by fastening means, the fastening means comprising a fastening rod which linearly moves forward from the fixed head part toward a movable head part side and linearly moves back toward the fixed head part and a stopper-operating cylinder rod which is provided for the movable head part and which moves forward and backward so as to intersect an extension line of the fastening rod, wherein the fastening rod has a fore-end locking portion that is locked and released by a stopper attached to the stopper-operating cylinder rod and has a rear-end locking portion, and wherein a jack fixing block is provided and fixed to the fixed head part at a position closer to the movable head part side than the rear-end locking portion, and the fastening rod is linearly moved forward and backward by expansion and contraction of a jack provided between the jack fixing block and the rear-end locking portion.