Lower cutter for shaving heads for dry razors

Abstract

The invention relates to a lower cutter (4) which together with an associated upper cutter (6) forms the shaving head of a dry razor. The upper cutter is designed in the form of a perforated metal sheet (6) which at least partially surrounds the lower cutter (4) and is prestressed against it. The lower cutter (4) has a plurality of spaced apart blades with cutting edges (12, 13) in the form of a strip between two peripheral regions (9, 10). The cross-section of the lower cutter (4) is substantially U-shaped. The width of the strip tapers monotonically in the direction of the center (Z) starting from the two peripheral regions (9, 10).

Description

technical field [0001] The invention relates to a lower cutter which together with an associated upper cutter forms the shaving head of a dry razor according to the preamble of claim 1 . Background technique [0002] An undercutter of this type is already known from US 7,022,195 B2, wherein such an undercutter consists of a plurality of strip-shaped blade elements having a constant width or increasing width towards the centre. [0003] Such cutters are located within the shaving head of a dry razor, are driven in an oscillating manner, are pressed against a perforated foil, and are subjected to complex loads during shaving. [0004] For example, they function by contact pressure with which the user presses the razor against the skin, subjecting the bar blades to bending loads about an axis corresponding to the blade width. During hair cutting, due to the cutting force, an additional mechanical load occurs which is a bending load at the apex and becomes a compound load consi...

AI Technical Summary

Problems solved by technology

[0005] Undercutter designs according to the known type have the disadvantage that they generate a high frictional resistance due to the viscous friction between the perforated sheet metal and the friction surface of the associated undercutter

This results in high energy consumption and, for the user, the heated shaving element is uncomfortable and wears prematurely

Because of the uneven distribution of mechanical stress over the individual blade lengths, these protrusions are uneven over the entire length of the blade due to the forces generated when the shaving head is pressed against the user's skin

This results in a partial loss of direct contact between the lower cutter and the perforated foil, so hairs that have passed through the perforated foil are not cut but just pulled in, which results in painful pulling of the hair from the skin

Also, the uneven protrusion of the blade can damage the perforated foil

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