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:
Nov. 07, 1995
Filed:
Nov. 08, 1993
Kiyotaka Otsuka, Hikone, JP;
Jyuzaemon Iwasaki, Nagahama, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A dry shaver includes a housing mounting thereon a cutter head which comprises a perforated outer shearing foil and an inner cutter. The outer shearing foil has a first axis along which it is arcuately curved. The inner cutter has a longitudinal axis along which it is arcuately curved to have an arcuate contour in conformity with the outer shearing foil. Projecting from the housing is a drive arm which is connected to reciprocate the inner cutter along a reciprocation path parallel to the first axis in hair shearing engagement with the outer shearing foil so that the inner cutter moves to and fro between two end positions spaced along the reciprocation path and defining therebetween a central position. A spring is provided to floatingly support the inner cutter to the drive arm for biasing the inner cutter against the outer shearing foil. The inner cutter is configured to satisfy the following relation that 0.5<R2/R1<1, wherein R1 is a radius of curvature of the outer shearing foil, and R2 is a distance between the pivot axis of the drive arm and a point at which an upper end of said inner cutter in said neutral position is in contact with said outer shearing foil, whereby said spring exerts a lower biasing force to the inner cutter when the inner cutter moves toward the end position than at the neutral position.