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. 13, 1998
Filed:
Oct. 16, 1996
Hideki Tamura, Ise, JP;
Satoru Hiro, Ise, JP;
Shinko Denki Kabushiki Kaisha, Tokyo-to, JP;
Abstract
Friction plates for a friction type coupling device for displaying a function of braking, holding, accelerating or decelerating by depressing and contacting one friction member against the other friction member of a friction type coupling device composed of two friction plates one fabricated of metals or non-metallic materials or inorganic material. One friction plate has a friction portion which is selectively depressed against the other friction plate and a remaining non-contacting portion. The friction portion is formed as a plurality of protrusions by cutting away, by engraving a plurality of grooves, by cutting away non-contacting portions or by positively forming a plurality of protrusions on the surface of the friction plate. The area ratio of the friction potion to the whole area of the friction plate, namely the total of the contacting portion plus non-contacting portion is rendered less than 60%, preferably, less than 10%, whereby the variation of the generated friction force is made minimum and is able to keep stable friction performance.