Inner cutter for a dry shaving apparatus

Details Inner cutter for a dry shaving apparatus Inner cutter for a dry shaving apparatus

1996-11-14

1999-03-23

Payer, Hwei-Siu

Cutlery

Blades

Razor blade

30 4392, B26B 1904

Patent

active

058844040

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to an inner cutter for a shaving head provided with an outer cutter, of a dry shaving apparatus, the inner cutter including several cutter blades in parallel relative alignment which are formed by means of slots cut into an elongate bar essentially transversely to the bar longitudinal extent, with the ends of the slots being of an arcuate configuration and each cutter blade being provided with a wall thickness that diminishes from the vertex of each arcuate end of each slot in the direction of a crest line of the bar.
An inner cutter of the type initially referred to is known in the art--see page 3 of the operating instructions for the "Braun Flex Control 4515 universal", "Braun Flex Control 4520 universal", and "Braun Flex Control 4525 universal" dry shaving apparatus, print reference 5585-075/XI-91. In these known dry shaving apparatus, two inner cutters manufactured from an elongate tubular bar are arranged on a mounting member. The cutter blades of the respective inner cutter are formed by means of slots cut into the tubular bar from a crest line thereof. The cutter blades obtained by the slots extending parallel to each other have their sides in parallel arrangement, whereby the wall of a cutter blade is of a uniform thickness up to the arcuate ends of each slot. The end of each slot is shaped in semi-circular form of a radius corresponding to half the relative distance of two adjacent cutter blades. In inner cutters made from bars, the wall thickness of a cutter blade is 0.2 mm and more. Cutter blades having a wall thickness of the dimension identified have an adverse effect on the cutting action of inner cutters.
It is an object of the present invention to improve the cutting action of an inner cutter of the type initially referred to.


SUMMARY OF THE INVENTION

According to the present invention, this object is accomplished in an inner cutter of the type initially referred to in that the reduction of wall thickness D extends from the vertex SP to the crest line SL.
A further solution of the object of the present invention consists in that the reduction of wall thickness D from the vertex SP covers an area B which is greater than half the relative distance A of two adjacent cutter blades in the area of the crest line SL, and that the geometric form of cross-section of the area B is determined by means of a series arrangement of several radii.
According to still another solution of the object of the present invention, the reduction of wall thickness D from the vertex SP covers an area B whose geometric form of cross-section is essentially parabolic.
According to yet another solution of the object of the present invention, the reduction of wall thickness D from the vertex SP covers an area B whose geometric form of cross-section is essentially elliptical.
The solutions of the inventions afford a plurality of advantages. By reason of the reduction of the wall thickness D of the cutter blades as disclosed in the inventions, which reduction, by comparison with the initially identified inner cutter known from the art, extends in the direction of the crest line SL of the bar and exceeds half the relative distance A of two adjacent cutter blades, it is possible to manufacture inner cutters in which the cutter blades have a wall thickness D of less than 0.2 mm, less than 0.15 mm, and even less than 0.1 mm, without involving the risk of breakage. Further, this reduction of wall thickness D of the cutter blades which, according to the present invention, is obtained over a major area, results in a smaller amount of overlap of the cutter blades with the perforations in the outer cutter of a shaving head, whereby the penetration of hairs into the perforations of the outer cutter is materially facilitated. In this manner, the cutting result of the dry shaving apparatus is significantly improved. The increase in the wall thickness D of a cutter blade as seen looking from the crest line SL of a cutter blade towards the vertex SP of a slot prevents breakage of the

REFERENCES:
patent: 2037957 (1936-04-01), Andis
patent: 2098849 (1937-11-01), Amsler
patent: 2281250 (1942-04-01), Ruskin
patent: 2307471 (1943-01-01), Schaffer et al.
patent: 3060569 (1962-10-01), Oliver et al.
patent: 3343258 (1967-09-01), Loner
patent: 4510687 (1985-04-01), Groothuis et al.
Braun Flex Control 4515 universal; Braun Flex Control 4520 universal; Braun Flex Control 4525 universal (Print Reference 5-585-075/XI-91).
Braun Flex Control 4515 universal; Braun Flex Control 4520 universal (Print Reference 5-585-088/V-93).
Copy of International Search Report dated Apr. 10, 1995.

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