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:
Jul. 21, 1998
Filed:
Mar. 19, 1996
Tooru Koyama, Aichi-ken, JP;
Kenji Mori, Gifu, JP;
Toyoda Gosei Co., Ltd., Nishikasugai-gun, JP;
Abstract
A steering wheel core metal unit comprising a boss section, a boss/spoke connecting section, spoke sections and a ring section integrally die-cast, with the boss section serving as an insert. Before trimming and after being released from a die caster, the boss/spoke connecting section of the core metal unit is provided with a gate section and the ring section comprises a pair of inside and outside ribs. Overflow sections are provided along the outer periphery of the ring section at substantially the intermediate positions among the spoke sections, respectively. The sectional area of the outside rib is made larger than that of the inside rib so that a final molten metal merging portion comes to lie at the outer periphery of the ring section. Accordingly, even when the molten metal moves in the cavity of the die caster as it entrains air, the air can escape from the overflow sections and no blowhole is formed in the core metal as a die cast product.