EP0521293A1 - Shaver head, especially a razor blade unit for a wet razor - Google Patents

Abstract

The invention relates to a shaver head, especially the razor blade unit of a wet razor, which is arranged on the front end of a handle and in which a single or double razor blade (6) is resiliently arranged in a plastic casing (1). In order to produce a shaver head, especially a razor blade unit of a wet razor, with improved spring mounting of the single or double razor blades, it is proposed according to the invention to attach the single or double razor blade (6) to a blade block (5) which is mounted so as to be displaceable in the plastic casing (1) against the resistance of a spring towards the rear wall (11) of the said plastic casing (1). <IMAGE>

Description

The invention relates to a razor head arranged at the front end of a handle, in particular a razor blade unit of a wet razor, in which a single or double razor blade is resiliently arranged in a plastic housing.

With disposable wet shavers, a single or double razor blade is embedded in the shaver head in a plastic housing. If the razor head is designed separately and can be attached to a handle, for which purpose the handle and the razor head have interlocking devices that correspond to one another, this is referred to as a so-called razor blade unit.

In a known razor blade unit of a wet shaver, a plastic housing with a front guide bar is provided. Within this plastic housing two razor blades are each resiliently arranged to form a double razor blade. For this purpose, the two razor blades each rest on lateral spring tongues so that they can adapt to the contour of the face during the shave.

A disadvantage of this known system is that the angle and thus the setting of the razor blades does not remain constant during the shave. Undesired vibrations or movements can occur in the respective razor blade, which can be the cause of unsatisfactory cutting performance.

Proceeding from this, the object of the invention is to create a razor head, in particular a razor blade unit of a wet razor, with an improved spring mounting of the single or double razor blades.

As a technical solution it is proposed with the invention that the single or double razor blade is attached to a blade block which is mounted against the spring force in the direction of the rear wall of the plastic housing in the latter.

A razor head designed according to this technical teaching, in particular a razor blade unit of a wet razor with the single or double razor blade attached to a blade block, has the advantage of an improved spring suspension. Thus, when using the usual double razor blade, the two individual razor blades fastened parallel to one another can be moved parallel and thus synchronously. The decisive advantage of this system is that the angle and thus the position of the razor blades remains constant during shaving and because of the precise technical guidance, undesirable vibrations or movements in the blade are avoided, so that optimal cutting performance can be achieved. The razor blades thus remain at a constant angle to one another during the shaving with the linear displacement movement, which is very good despite the spring bearing Cutting result leads. Under the linear guide is not only to be understood that the blade block performs an exact linear movement by moving it equally on both the left and on the right side towards the rear wall of the plastic housing, it is equally to be understood that the Blade block is shifted only at one of the two ends in the direction of the rear wall of the plastic housing and, as it were, executes a pivoting movement in the plane of the razor blade, the fulcrum forming the other end of the blade block. Overall, the blade block can thus move in parallel or non-parallel. This offers the advantage that a slight deflection of the blade block is ensured depending on the shaving forces acting on it. The blade block can be made of plastic or metal. It can be in one part or in several parts. The razor blades are fastened to the block of blades with a resistant connection method that can withstand the stresses of shaving, for example by gluing, welding, friction locking, positive locking or riveting.

In a preferred development it is proposed that the blade block can be displaced parallel to the plane (s) of the razor blade (s). As a result, a parallel horizontally movable blade block is created, the razor blades attached to the blade block being displaceable parallel to the face tangent at the selected angle of attack. This ensures an optimal cutting result when the razor blades are spring loaded.

In order to achieve precise guidance of the blade block, the sliding movement of the blade block is guided through a cover cap of the plastic housing on the upper side.

To form an optimal spring mounting, it is proposed that a compression spring be arranged between the blade block and the rear wall of the plastic housing. This compression spring, supported between the rear wall of the plastic housing and the blade block, ensures the necessary restoring force for the blade block.

The compression spring is preferably a curved leaf or wire spring. This can consist of plastic or metal and is correspondingly inserted into the plastic housing so that it is supported between the rear wall of the plastic housing and the blade block. In one development, the leaf or wire spring can be curved several times over its length. This means that one curvature adjoins the other, so that several contact points are provided on the rear wall of the plastic housing on the one hand and on the blade block on the other. On the one hand, this has the advantage of a uniform application of pressure over the length of the blade block, and on the other hand, the one-sided displacement movements already described can thereby be carried out.

As an alternative to what has been said above, the restoring force can also be applied by a resilient cam located in the apparatus, which likewise ensures spring mounting of the blade block.

In a preferred development of the blade block, the blade block laterally has a guide rail, by means of which the blade block can be displaced in corresponding recesses in the plastic housing. Thanks to these guide rails, the system has flawless guiding properties. The guide rails can be guided outwards through the plastic housing, in particular through an upper blade shell be. This enables the function to be checked. The blade block can also be pushed back for cleaning.

A further development of the guide rails suggests that they are convexly curved on the outside. The curvature is designed in such a way and has the purpose that the one-sided displacement movement in the form of the previously described pivoting movement in the plane of the razor blades is made possible in that a force acting on one side also leads to a movement that can be deflected on one side.

A preferred further development of the razor head, in particular in the form of the razor blade unit, proposes that the plastic housing consists of an assembled lower part and upper part, between which the blade block is arranged as a separate component. This has the advantage that the razor blade unit can be constructed in a technically simple manner and can be assembled correspondingly easily. The upper part of the plastic housing is preferably designed in a frame-like manner in that a front guide strip and a rear cover cap are firmly connected to one another with side walls leaving an intermediate distance.

In a preferred development of the lower part, it has openings. These have the advantage that the shaving foam can be better removed during shaving and that the cleaning of the razor blade unit is also improved.

Finally, it is proposed in a further development that the blade block has at least one cam which is guided to the outside through an opening in the plastic housing. Preferably the blade block has a cam on each side, which is guided to the outside through corresponding openings in the side walls of the plastic housing. With these cams, the blade block can be easily operated from the outside, which considerably improves the cleaning of the razor blades.

Fig. 1

eine perspektivische Ansicht der Rasierklingeneinheit;

Fig. 2

eine Art Explosionsdarstellung der Rasierklingeneinheit in Fig. 1 vor dem Zusammenbau;

Fig. 3

eine Ansicht der Rasierklingeneinheit entsprechend der in Fig. 1 jedoch mit einer mittigen Druckbeaufschlagung auf den Klingenblock für eine exakte lineare Verschiebebewegung nach hinten;

Fig. 4

eine Darstellung entsprechend Fig. 3, jedoch mit einer Druckbeaufschlagung auf die linke Seite des Klingenblocks, so daß dieser im linken Bereich in Richtung Rückwand des Kunststoffgehäuses verschoben wird;

Fig. 5

eine Darstellung entsprechend Fig. 3, jedoch mit einer Druckbeaufschlagung auf die rechte Seite des Klingenblocks, so daß dieser im rechten Bereich in Richtung Rückwand des Kunststoffgehäuses verschoben wird;

Fig. 6

einen Schnitt durch die Rasierklingeneinheit in Fig. 1 in der Grundstellung des Klingenblocks;

Fig. 7

ebenfalls eine Schnittdarstellung durch die Rasierklingeneinheit entsprechend Fig. 6, jedoch mit nach hinten verschobenem Klingenblock.

An embodiment of a razor head according to the invention in the form of a so-called razor blade unit for a wet shaver is described below with reference to the drawings. In these shows:

Fig. 1

a perspective view of the razor blade unit;

Fig. 2

a kind of exploded view of the razor blade unit in Figure 1 before assembly.

Fig. 3

a view of the razor blade unit corresponding to that in Figure 1 but with a central pressure on the blade block for an exact linear displacement movement to the rear.

Fig. 4

an illustration corresponding to Figure 3, but with a pressurization on the left side of the blade block, so that it is moved in the left area towards the rear wall of the plastic housing.

Fig. 5

an illustration corresponding to Figure 3, but with a pressurization on the right side of the blade block, so that it is moved in the right area towards the rear wall of the plastic housing.

Fig. 6

a section through the razor blade unit in Figure 1 in the basic position of the blade block.

Fig. 7

also a sectional view through the razor blade unit according to FIG. 6, but with the blade block moved to the rear.

The razor blade unit consists of a plastic housing 1. This is composed of a lower part 2 and an upper part 3, the lower part 2 having openings 4 in the base area. The lower part 2 and the upper part 3 can be firmly connected to one another by a wide variety of possibilities, for example by welding, gluing, locking, plugging into one another, etc.

A blade block 5 is slidably mounted within the plastic housing 1. This blade block 5 is equipped with two razor blades 6 to form a double razor blade, which are firmly connected to the blade block 5. The blade block 5 with its razor blades 6 is slidably mounted on the bottom of the lower part 2. The top of the blade block 5 is guided through a rear cap 7 of the upper part 3 of the plastic housing 1. For further guidance, the blade block 5 has a guide rail 8 on each side, which are guided in a corresponding recess 9 in the plastic housing 1. Fig. 2 shows that the two guide rails 8 are slightly convex on the outside.

The sectional views in FIGS. 6 and 7 show that the blade block 5 has a strip 10 on the underside, between the and the rear wall 11 of the plastic housing 1, a compression spring 12 in the form of a leaf spring is supported. This compression spring 12 has the tendency to press the blade block 5 forward in the direction of the guide bar 13 of the plastic housing 1, as is shown, for example, in FIG. 6. The compression spring 12 in the form of the leaf spring is curved several times, as can be seen in Fig. 2, ie there are three arches in a row, so that the compression spring 12 with two break points on the rear wall 11 of the plastic housing 1 and with three bulge points on the Bar 10 of the blade block 5 rests.

Furthermore, it can be seen in FIG. 2 that the blade block 5 has a cam 14 on each side, which is formed on the corresponding guide rails 8. These cams 14 of the blade block 5 are led out through openings 15 in the side walls of the plastic housing 1 and can thus be actuated. These openings 15 in the side walls of the plastic housing 1 are defined by lateral recesses both in the upper part 3 and in the lower part 2 of this plastic housing 1 after the assembly of these two parts.

The razor blade unit works as follows:
In Fig. 1 and in Fig. 6, the basic position of the razor blade unit and in particular the blade block 5 is shown, ie the blade block 5 is in its foremost position, in which the cutting edges of the razor blades 6 on the tangent between the front guide bar 13 and rear cap 7 are. When pressure is applied in the middle of the blade block 5, as is indicated by the arrow P in FIG. 3 and in FIG. 7, the blade block 5 moves together with those fixedly arranged thereon Razor blades 6 in the direction of the rear wall 11 of the plastic housing 1. This is a pure linear movement of the blade block 5, so that it dips evenly into the plastic housing 1.

Alternatively, the pressure can also be applied on the left side (FIG. 4) or on the right side (FIG. 5) of the clinic block 5. As a result, the blade block 5 is not moved uniformly over its entire length in the direction of the rear wall 11 of the plastic housing 1, but only in the area where the pressure is applied, that is to say either on the left (FIG. 4) or on the right (FIG. 5). The blade block 5 executes, as it were, a pivoting movement in the plane of the razor blades 6 around the opposite end as a fulcrum.

The blade block 5 can be moved by hand within the plastic housing 1 by means of the lateral cams 14, so that an improved cleaning of the razor blades 6 is possible.

Reference symbol list

1

Plastic housing

2nd

Lower part

3rd

Top

4th

Breakthrough

5

Blade block

6

razor blade

7

Cover cap

8th

Guide rail

9

Recess

10th

strip

11

Back wall

12

Compression spring

13

Guide bar

14

cam

15

opening

P

arrow

Claims (12)

A razor head arranged at the front end of a handle, in particular a razor blade unit of a wet razor,
in which a single or double razor blade (6) is resiliently arranged in a plastic housing (1),
characterized by
that the single or double razor blade (6) is attached to a blade block (5) which is displaceably mounted against the spring force in the direction of the rear wall (11) of the plastic housing (1). A razor head according to claim 1, characterized in that the blade block (5) is displaceable parallel to the plane (s) of the razor blade (s) (6). A razor head according to claim 1 or 2, characterized in that the sliding movement of the blade block (5) is guided on the top side by a cover cap (7) of the plastic housing (1). A razor head according to one of claims 1 to 3, characterized in that a compression spring (12) is arranged between the blade block (5) and the rear wall (11) of the plastic housing (1). A razor head according to claim 4, characterized in that the compression spring (12) is a curved leaf or wire spring. A razor head according to claim 5, characterized in that the leaf or wire spring is curved several times over its length. A razor head according to one of claims 1 to 6, characterized in that the blade block (5) has a guide rail (8) on each side, by means of which the blade block (5) can be displaced in corresponding recesses (9) in the plastic housing (1). A razor head according to claim 7, characterized in that the guide rails (8) are convexly curved on the outside. A razor head according to one of claims 1 to 8, characterized in that the plastic housing (1) consists of a lower part (2) and upper part (3) which can be assembled and between which the blade block (5) is arranged as a separate component. A razor head according to claim 9, characterized in that the lower part (2) has openings (4). A razor head according to one of claims 1 to 10, characterized in that the blade block (5) has at least one cam (14) which is guided to the outside through an opening (15) in the plastic housing (1). A razor head according to claim 11, characterized in that the blade block (5) has a cam (14) on each side, which is led to the outside through corresponding openings (15) in the side walls of the plastic housing (1).

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