Patent ID: 7465220

Claim:
A portable device for grinding corrugations into a narrow surface forming one side of the cutting edge of a blade of a pair of scissors for which the cutting edge of the blade has been resharpened, comprising: a portable base; a blade holder carried by said base and configured to support the blade to be corrugated; a corrugating wheel carried by said base in a manner rotatable about an axis of rotation relative to said base and having an annular circumferential edge defining a corrugating surface therein, wherein any line taken in a direction parallel to the axis of rotation and across substantially the entire corrugating surface measures substantially less than the length of the blade of the scissors, and wherein said corrugating surface defines a plurality of alternating radially projecting, triangular shaped peaks and grooves; an axial shaft carried by said base and nonrotatably connected to said corrugating wheel and having a central axis of rotation coincident with the axis of rotation of said corrugating wheel; a motor carried by said base and having an armature configured to rotate at a first revolution per minute (RPM) rating; and a gearing arrangement carried by said base and connecting said rotatable armature of the motor to the axial shaft, said gearing arrangement being configured to convert the first RPM rating to a second RPM rating.