EP0306711B1 - Shaving blades unit - Google Patents

Abstract

1. A razor blade unit for a wet shaver, in which unit one razor blade or two parallel razor blades (2, 2') are disposed in a plastics body (1), the same having a guide surface (8) which extends parallel to the cutting edges (3, 3') of the blades (2, 2') and is disposed before such edges as considered in the shaving direction, the body (1) also having protective cap (4) which is disposed after such edges as considered in the shaving direction, a cylindrical roller (7) which is rotatable around a pivot (6) parallel to the blade cutting edges (3, 3') being mounted for free rotation in the protective cap (4) and slightly projecting therefrom, characterised in that a single cylindrical metal roller (7) is provided for the razor blade unit, the roller is disposed in the protective cap (4) behind the blade cutting edges (3, 3'), and the blades (2, 2'), whose cutting edges (3, 3') are disposed between the front plastics guide surface (8) and the back metal roller (7), are embedded in the plastics body (1).

Description

The invention relates to a razor blade unit for a wet shaving apparatus, in which a razor blade or two razor blades parallel to one another are arranged in a plastic body, the plastic body having a guide surface parallel to the cutting edges of the razor blades in the shaving direction in front of the cutting edges of the razor blades and a protective cap in the razor device behind the Has cutting edges of the razor blades, wherein in this protective cap with a slight overhang a cylindrical roller about an axis parallel to the cutting edges of the razor blades is freely rotatable.

Such a razor blade unit for a wet shaver is known from US Pat. No. 4,378,633, in which two parallel razor blades are resiliently arranged in a plastic body. Both in front of and behind both razor blades there is a roller which is freely rotatable about an axis parallel to the cutting edges of the razor blades. While the roller in the area of the front guide surface of the plastic body, like the two razor blades, is resiliently mounted within the plastic body, the rear roller in the area of the protective cap can be rotated freely within the plastic body and is supported with a small projection.

By means of the spring-loaded razor blades and the two rollers, one of which is also spring-loaded, a gentle and relatively low-friction "feeling" is to be achieved during the shave, which is achieved by reducing the pressure due to the spring-loaded bearing. This improved "feeling", however, does not improve the quality of the shave, since the resilient mounting of the two razor blades and the formation of the two rollers made of the same material as the plastic body allow skin folds to form, so that an optimal shaving geometry cannot be achieved . The consequences of this are skin irritation (skin irritation) that can occur after shaving.

From US-A 2 068 085 a wet shaver is known which is either made of metal or - apart from the razor blades - is made of plastic. A razor blade is fixed between a base plate and a cover of the razor head. On the cover of the razor head, a roller which is cylindrical about an axis parallel to the two cutting edges of the razor blade is freely rotatable. The purpose of this, together with the front guide strip of the base plate, is to specify a specific shaving angle.

Based on this, the object of the invention is to further develop the known razor blade unit for a wet shaver of the type specified at the outset in such a way that a better shaving result is achieved by improving the shaving geometry.

As a technical solution it is proposed with the invention that a single cylindrical roller made of metal is provided for the razor blade unit and this is arranged in the protective cap behind the cutting edges of the razor blades and that the razor blades, the cutting edges of which are made between the front plastic guide surface and the rear roller Metal are arranged, are embedded in the plastic body.

A razor blade unit for a wet shaver designed according to this technical teaching has the advantage that it achieves very good shaving success and thus improved comfort when shaving. This is achieved by means of a significantly improved shaving geometry due to an improved skin tension, due to a difference between the coefficient of friction of the front plastic guide surface and the coefficient of friction of the rear metal roller. Since the coefficient of friction of the plastic is greater than that of the metal, the front plastic guide surface pushes the skin in front of it, while the rear metal roller slides over the skin, so that the skin is stretched between the guide surface and the roller, which in addition improves Successful shaving and improved comfort.

• Fig. 1 eine Ansicht einer Rasierklingeneinheit, bei der eine zylindrische Rolle aus Metall in der Schutzkappe angeordnet ist;
• Fig. 2 einen Schnitt entlang der Linie 11-11 in Fig. 1.

An embodiment of a razor blade unit according to the invention is described below with reference to the drawing. In this shows:

• Figure 1 is a view of a razor blade unit in which a cylindrical roller made of metal is arranged in the protective cap.
• FIG. 2 shows a section along the line 11-11 in FIG. 1.

The razor blade unit for a wet shaving apparatus consists of a plastic body 1, in which two razor blades 2, 2 'are embedded in the form of a double razor blade, the cutting edges 3, 3' of the razor blades 2, 2 'being arranged one behind the other offset.

The surfaces of the razor blades 2, 2 'lying behind the cutting edges 3, 3' are covered by a protective cap 4 of the plastic body 1. In this protective cap 4, a roller 7 made of metal is freely rotatable about an axis 6, wherein this roller 7 made of metal has a slight protrusion with respect to the protective cap 4.

In front of the razor blades 2, 2 ', a transverse guide surface 8 is formed, which is formed in one piece with the plastic body 1 and thereby with its side legs 5.

The roller 7 made of metal has in contact with the skin a significantly lower coefficient of friction compared to the plastic of the plastic body 1, both in the dry and in the wet state, so that the frictional forces occurring on the metal roller are greatly reduced. This difference in coefficient of friction has the advantage that the skin in the region of the front guide surface 8 made of plastic is pushed in front of it, while the rear roller 7 slides over the skin made of metal, so that the skin is stretched between, which leads to improved shaving success and leads to improved comfort.

Reference symbol list

• 1 plastic body
• 2 razor blades
• 2 'razor blade
• 3 cutting edge
• 3 'cutting edge
• 4 protective cap
• 5 side legs
• 6 axis
• 7 roll
• 8 guide surface

Claims (1)

1. A razor blade unit for a wet shaver, in which unit one razor blade or two parallel razor blades (2, 2') are disposed in a plastics body (1), the same having a guide surface (8) which extends parallel to the cutting edges (3, 3') of the blades (2, 2') and is disposed before such edges as considered in the shaving direction, the body (1) also having protective cap (4) which is disposed after such edges as considered in the shaving direction, a cylindrical roller (7) which is rotatable around a pivot (6) parallel to the blade cutting edges (3, 3') being mounted for free rotation in the protective cap (4) and slightly projecting therefrom, characterised in that a single cylindrical metal roller (7) is provided for the razor blade unit, the roller is disposed in the protective cap (4) behind the blade cutting edges (3, 3'), and the blades (2, 2'), whose cutting edges (3, 3') are disposed between the front plastics guide surface (8) and the back metal roller (7), are embedded in the plastics body (1).

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