The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 1990
Filed:
May. 09, 1989
Minoru Takada, Sakaki, JP;
Nissei Jushi Kogyo Kabushiki Kaisha, Nagano, JP;
Abstract
The method having a clamping cylinder which slidably fits a clamping ram whose front end is fixed on a movable board of an injection molding machine, etc., an inner space of the clamping cylinder divided into a rear chamber W and a front chamber X by a large-diameter piston section of the clamping ram, an inner rear wall of the clamping cylinder having a mold opening piston fixed thereto having a front end slidably fit in the clamping ram from the rear, an inner space of the clamping ram being divided into a chamber Y and a chamber Z opening to the atmosphere by the large-diameter piston section of the opening piston, a hydraulic controlling device 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, the effective pressure receiving area of the chamber Y being preferably designed to be equal to the cross-sectional area of the cylindrical section of the clamping ram.