B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/707
B29C 45/67 (2006.01)
Patent
CA 1286075
ABSTRACT OF THE INVENTION The device of this invention has a clamping cylinder which slidably fits a clamping ram whose front end is fixed on a movable board of injection molding machines, etc. The inner space of the clamping cylinder is divided into a rear chamber W and a front chamber X by the large-diameter piston section of the clamping ram. On the inner rear wall of the clamping cylinder, a mold opening piston is fixed having a front end slidably fit in the clamping ram from the rear. The inner space of the clamping ram is divided into a chamber Y and a chamber Z opening to the atmoshpere by the large-diameter piston section of the opening piston. A hydraulic controlling device is provided which connects the chambers X, Y and Z to an oil pressure source and connects the chambers X and Y to the chamber W for a high-speed mold closure, which connects the chamber W to the oil pressure source and relieves the pressure in the chambers X and Y for a tight clamping, and which connects the chamber Y to the oil pressure source and connects the chamber W to both the chamber X and the oil tank for opening the mold. Preferably, the effective pressure receiving area of the chamber Y is designed to be equal to the cross-sectional area of the cylindrical section of the clamping ram.
559937
Nissei Jushi Kogyo Kabushiki Kaisha
Smart & Biggar
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