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US 4,301,593 AGranted
Anti-spin coupling for orbiting disc razor
OwnerRussell P. Mayinventor
Life of this patent
Estimating the term…
Abstract
Annular discs having narrow sharp edge slots therethrough are supported in circular raceways in a razor head by eccentric drive balls which impart planetary motion thereto. The eccentric drive balls are pivotally mounted on the ends of rapidly rotating drive shafts so that they swing outwardly away from the shaft axis, thereby pressing the edges of the discs against the edges of the raceways, preventing spinning of the discs and imparting thereto a tendency to rotate slowly, contrary to the orbiting directions of the discs.
Claims4
In a razor, head surface means having an annular raceway therein,
- a flat annular disc disposed in said raceway, the periphery of said disc being smaller than the diameter of said raceway, and
- means for imparting orbital motion to said disc in the plane thereof whereby said sharp edges slice along the skin surface against which one side of said disc is engaged, said means comprising,
- a socket on the other side of said disc,
- a ball engaging in said socket,
- a rotating drive shaft,
- a means mounting said ball on said drive shaft for rotation therewith, said means providing freedom of movement of said ball under centrifugal force to an extremity of eccentricity with respect to the rotational axis of said drive shaft, whereby to force the periphery of said disc against the raceway as said disc orbits.
3 more elements
A razor comprising,
- a casing having a wall,
- a generally flat planar disc loosely disposed in a surrounding raceway in said wall and adapted for one flat side thereof to be engaged against a skin surface to be shaved,
- a plurality of apertures through the disc bounded by sharp edges on opposite sides of the apertures,
- drive means for moving said disc about an orbit approximately equal to or slightly greater than the distance between said opposed sharp edges,
- said drive means comprising a socket on the other side of the disc, a rotating shaft disposed substantially normal to the plane of the disc, and
- an eccentric ball pivoted on said shaft and engaged in said socket.
3 more elements
Dependencies are inferred from the claim text.