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. 28, 2002
Filed:
Jun. 28, 2001
Toyo Tire & Rubber Co., Ltd., Osaka, JP;
Abstract
The present invention provides a molding tool capable of forming a molding with a cylindrical core while ensuring the discharge of the air in the vicinity of an upper end portion and forming no end face burr. As the device for this molding tool, an upper mold and a lower mold , as can be clamped, are provided with insert dies and having fitting hole portions and at their centers. The lower fitting hole portion is provided with a support pin to be fitted in the cylindrical core thereby to retain the cylindrical core , and the upper fitting hole portion is provided with a core holder so that a cavity is formed around the outer circumference of the cylindrical core when in the clamped state, to charge the cavity with a molding material to be shaped. A seal ring is mounted in the fitting hole portion of the upper insert die to fit the outer circumference of the upper end portion of the cylindrical core while holding a slight air ventilation. The upper mold is provided with an injection hole for the molding material and a relief hole for the air and the molding material.