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:
Oct. 21, 2003
Filed:
Dec. 22, 2000
Masato Uneme, Nagoya, JP;
Takaaki Hayashida, Nagoya, JP;
Chuo Hatsujo Kabushiki Kaisha, Aichi-Ken, JP;
Abstract
In a frictional hinge device, a diameter-increased section of a rotation shaft is formed so that the surface roughness (Ra) is 0.05˜0.20 &mgr;m in the circumferential direction, and the surface roughness (Ra) in the axial direction is 0.15˜0.30 &mgr;m. A relationship between a deviation “P-P” and an innermost dent V is defined as P-P<2.5 &mgr;m and V<1.0 &mgr;m. With the use of synthetic resin (PC, PAR, PPS, e.t.c.), a support block is provided integrally around the rotation shaft The support block tightly engages with the rotation shaft due to a residual stress based on a shrinkage allowance appeared when molding the synthetic resin. With a good deviation “P-P”, a shallower innermost dent V and a smaller surface roughness in the circumferential direction, a stable surface friction is maintained for an extended period time with the least amount of wear. By making the surface roughness (Ra) in the circumferential direction smaller by 0.1˜0.2 &mgr;m than the surface roughness (Ra) in the axial direction, the stable torque is positively insured with no initial scratch and no stickslip.