Reciprocatory dry shaver

Details Reciprocatory dry shaver Reciprocatory dry shaver

1993-11-08

1995-11-07

Rada, Rinaldi I.

Cutlery

Razors

With cooperating shearing blades

30 49, B26B 1904, B26B 1912

Patent

active

054638135

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.

REFERENCES:
patent: 2282639 (1942-05-01), Bruecker
patent: 2284038 (1942-05-01), Bruecker
patent: 2559772 (1951-07-01), Kobler et al.
patent: 2562104 (1951-07-01), Kobler et al.
patent: 4428117 (1984-01-01), Horii et al.

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