Method of making outer blades for electric shavers
AssigneeMatsushita Electric Works, Ltd.
InventorYoshimitsu Nakamura
Life of this patent
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Abstract
A method of making outer blades for electric shavers wherein a metal sheet in which many hair inlet holes are made by punching or coining process is subjected to grinding process performed on the side at which the blade is to engage inner blade of the shaver and then to pressing process with a soft ram pressed against a rigid body on which the sheet is placed, so that any grinding fins remaining on peripheral edges of the respective holes will be thereby removed.
Claims9
The method of making an outer blade for an electric shaver comprising the steps of forming a thin metal plate with a two-dimensional pattern of openings separated by lands so that each land is of arcuate section producing a smooth lower side having upwardly presented edges of metal extending in a direction away from the smooth side, grinding the upwardly presented edges to the same level to sharpen them accompanied by formation of fins which extend laterally from the lands into the adjacent openings, and then pressing the blade between a smooth layer of hard material on one side and a layer of resilient material on the other, the resilient material being on the finned side and the hard material being on the smooth side, so that the surface of the resilient material bulges locally through the individual openings to break off the fins with the result that each opening is bounded by clearly defined sharpened edges.
Dependencies are inferred from the claim text.