EP0453717A1 - Shaving head, in particular the razor blade unit of a mechanical razor - Google Patents

Abstract

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 (2) is arranged in a plastic body (1), the upper side (12) defining the pressure surface on the skin ) of the razor head over the cutting edge (s) (3) of the razor blade (s) (2) parallel to the shaving direction and at a distance from each other sections of a wire (11). In order to create a razor head, in particular a razor blade unit, with an improved wire winding, the invention proposes that the plastic body (1) be distributed over the length of guide elements for both the area of the front (13) and the area of the rear (16) has the wire (11) with which it is guided back and forth in a zigzag pattern extending over the top (12) of the shaver head. <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 arranged in a plastic body, with the cutting edge (s) above the cutting edge (s) in the region of the upper side of the razor head which defines the pressure surface on the skin. the razor blade (s) run parallel to the shaving direction and at a distance from each other sections of a wire.

Wet shavers are known in various embodiments. A razor head, which carries the single or double razor blade, is arranged at the front end of a handle. The front shaver head can be integrally formed with the handle in the form of a molded plastic part. If the razor head is designed separately from the handle and can be exchangeably attached to it by means of a corresponding mechanism, one speaks of a so-called razor blade unit, in which a single or double razor blade is embedded in a plastic housing so that it cannot be detached.

A razor head in the form of such a razor blade unit of the type mentioned is known from DE-GM 87 11 506. The plastic body with the double razor blade embedded in it is wrapped with a wire with several turns lying next to one another, the individual turns in the area of the contact surface of the razor blade unit against the skin running parallel to and at a distance from one another, while they run obliquely in the area of the underside of the plastic body . This protective wire wrap significantly improves the shaving properties. The wire prevents the formation of a skin fold, so that skin injuries are avoided even in the invisible area. In addition, the wire reduces the shaving resistance required because it reduces the frictional force. Finally, the protective wire prevents the user from accidentally cutting the razor blades if the razor blade assembly is handled improperly.

However, the wire also runs through the helical wrapping of the plastic body in the area of the underside of the razor blade unit, namely where the razor blade unit has to be attached to the handle. However, the wire wrapping and the fastening mechanism interfere with each other. Furthermore, there is a risk in the wire wrapping of the known razor blade unit that the wire shifts laterally.

On this basis, the invention addresses the problem of providing a razor, in particular to provide an improved wire wrapping a razor blade unit.

As a technical solution , the invention proposes that the plastic body both in the area of the front and also in the area of the rear over the length has guide elements for the wire, with which the wire is guided in a zigzag manner back and forth over the top of the shaver head.

A razor head designed according to this technical teaching and in particular a razor blade unit designed according to this technical teaching has the advantage that the underside of the plastic body remains free and the handle can therefore be attached to the underside of the razor head without problems. With the razor blade units in particular, all possible fastening systems can thus be implemented. In addition, lateral displacement of this wire is prevented in the course of the protective wire according to the invention. The “zigzag-shaped guidance” of the wire is understood to mean that the wire sections in the effective area run parallel to the shaving direction and in particular at the same distance from one another. Outside the effective range of the wire sections in the area of the front and the back of the plastic body, the wire is returned by 180 ° in order to create the back and forth.

In a preferred embodiment of the guide elements, these are designed as projections of the plastic body, around which the wire is guided. These projections of the plastic body are to be formed in one piece with it, so that there are no manufacturing problems. The wire is led around the outside of the projections.

The projections can be of any design. For example, it is conceivable to provide, as a return for a wire section, for example two pins which are arranged at a distance from one another and whose distance is essentially the distance between them corresponds to parallel wire sections. In a preferred embodiment, however, the projections have a width which essentially corresponds to the intermediate distances between the projections. The projections are thus designed as ramps or strips extending parallel to the cutting edge of the razor blade, the “width of the projections” being understood to mean the length of the projections parallel to the cutting edge of the razor blade. In this embodiment, the projections are offset with respect to the front and the back of the plastic body, ie the projections on the front fill the gaps of the projections on the back and vice versa. This ensures that the wire sections run parallel in the effective area.

A further development suggests that the plastic body preferably has a fastening projection for fastening the two wire ends at the end in the region of the rear side. This represents a technically very simple way of attaching the wire ends to the plastic body.

In a preferred development of the razor head, the razor blade is inserted into the platform of the plastic body essentially from above and is held by the wire. Thus, the wire is used at the same time for fastening the razor blade on the platform, so that there is no need for any other fastening, for example in the form of riveting.

If a double razor blade is provided, it is proposed in a further development that the two razor blades are fastened to both sides of a spacer arranged therebetween, the razor blade / spacer / razor blade unit thus formed essentially from above onto a platform of the plastic body is inserted into it and is held by the wire. The advantages mentioned in the case of the single razor blade apply accordingly, in particular that riveting is dispensed with by this fastening.

If the razor head has a front guide strip, which is preferably provided with a step-like longitudinal profile, and a rear cover cap, it is proposed in a development of the invention that the wire in the region of the guide strip and the cover cap is guided below these parts and covered by them. The wire thus runs between the guide bar or the cover cap and the actual plastic body with the blade platform. This ensures that the function of the front guide bar, in particular with its stair-like longitudinal profile, is not reduced by the friction-reducing wire sections, since the front guide bar is particularly required for pretensioning the skin. The same applies to the function of the cap, which is not affected by a wire running over it.

In a preferred development of this idea, the guide strip and the cover cap are connected to one another via side strips, in particular via side walls, leaving a central opening in the area of the cutting edge (s) of the razor blade (s), and the upper part of the plastic body thus formed is on the base part of the plastic body with the razor blade (s) attached to a platform of the base part by means of the wire and firmly connected to it. This one-piece upper part formed from the front guide strip, the rear cover cap and the side strips thus creates a simple assembly of the razor head and in particular the razor blade unit. After attaching the single or in particular double razor blade on the platform of the base part by means of the wire, the upper part only has to be plugged onto the base part essentially from above and firmly connected to it. This can be done, for example, by latching or in some other way.

In order that the wire does not interfere and to give it additional guidance, in a further development the inner sides of the guide bar and the cover cap facing the wire have receiving grooves for the wire.

In a further development of the upper part, this has recesses which engage with the projections of the base part of the plastic body. This creates an optimal mutual association of the upper part with the base part of the plastic body.

In a further development of the cover cap, it is provided with a friction-reducing sliding strip. This sliding strip is preferably convexly curved and, in a preferred embodiment, has a front, essentially flat or slightly convexly curved sliding strip leg and an angled rear, also essentially flat or slightly convexly curved sliding strip leg, which are connected to one another by an arc. The sliding strip bent over the cover cap can be created and applied using a special hot molding process. The particular advantage is that the sliding strip is also more effective at the end of the razor head. Since the skin is stretched and pressed in during shaving, a bulge forms at the end of the shaver head. The glide strip shaped in the radius glides optimally in this area and thus increases the gentle shave.

The above-described individual features of the subject matter of the invention with regard to its advantageous developments, as they are also the subject of the following claims 2 to 13, each represent individual inventions without having to be in connection with other features.

Fig. 1

eine Draufsicht auf eine Rasierklingeneinheit;

Fig. 2

eine Vorderansicht der Rasierklingeneinheit;

Fig. 3

eine Rückansicht der Rasierklingeneinheit;

Fig. 4

eine Unteransicht der Rasierklingeneinheit;

Fig. 5

eine Seitenansicht der Rasierklingeneinheit in vergrößertem Maßstab;

Fig. 6

einen Schnitt entlang der Linie VI-VI in Fig. 1 durch die Rasierklingeneinheit in vergrößertem Maßstab;

Fig. 7

eine Draufsicht auf das Basisteil der Rasierklingeneinheit ohne das durch die vordere Führungsleiste, die hintere Abdeckkappe sowie die Seitenwände gebildete, aufgesetzte Oberteil;

Fig. 8

eine Vorderansicht des Basisteils;

Fig. 9

eine Rückansicht des Basisteils;

Fig. 10

eine Unteransicht des Basisteils;

Fig. 11

eine Seitenansicht des Basisteils in vergrößertem Maßstab.

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

Fig. 1

a plan view of a razor blade unit;

Fig. 2

a front view of the razor blade unit;

Fig. 3

a rear view of the razor blade unit;

Fig. 4

a bottom view of the razor blade unit;

Fig. 5

a side view of the razor blade unit on an enlarged scale;

Fig. 6

a section along the line VI-VI in Figure 1 by the razor blade unit on an enlarged scale.

Fig. 7

a plan view of the base part of the razor blade unit without the upper part formed by the front guide strip, the rear cover cap and the side walls;

Fig. 8

a front view of the base part;

Fig. 9

a rear view of the base part;

Fig. 10

a bottom view of the base part;

Fig. 11

a side view of the base part on an enlarged scale.

A razor head in the form of a so-called razor blade unit for a wet shaver, which can be attached to the front end of a handle, not shown, consists of a plastic body 1 in which two razor blades 2 are arranged, the cutting edges 3 of which run parallel and offset one behind the other.

The plastic body 1 consists of a base part 4 with the razor blades 2 and an upper part 5 placed on this base part 4.

The base part 4 of the plastic body 1 initially has feed-through slots 6 on the inside. At the top, the base part 4 defines a platform 7 for the razor blades 2. For this purpose, a spacer 8 is sandwiched between the two razor blades 2, the two razor blades 2 being firmly connected to this spacer 8. These thus form a razor blade / spacer / razor blade unit 9. This is placed on the platform 7 of the base part 4 from above, the spacer 8 projecting laterally for this purpose and being received in lateral recesses 10 of the base part 4.

The unit 9 is held by means of a zigzag wire 11 which is guided over the top 12 of the unit 9 and thus the base part 4 of the plastic body 1. To guide the wire 11, the base part 4 has on the front 13 in the lower area directed downward, formed projections 14, which are designed as elongated strips. The width of these projections 14 in the direction of the cutting edges 3 of the razor blades 2 essentially corresponds to the distance between the projections 14. In the front region, the projections 14 have a raised extension 15.

Correspondingly, the rear side 16 of the base part 4 has projections 14 ′ which are directed towards the rear. These projections 14 ′ fill the gaps between the projections 14 on the front 13. Corresponding to the projections 14, the projections 14 'also have projections 15' which, however, are directed downwards. Finally, fastening projections 17 are integrally formed on the rear side 16 of the base part 4.

The wire 11 is first fastened with its one end to a fastening projection 17. Then it is guided via the unit 9 to the front to the projection 14 and around it, in order to subsequently run back through 180 ° over the unit 9, where the wire 11 is guided around the projection 14 ′ there. The wire 11 is guided in succession around the projections 14 and 14 ′ in order to finally be attached at its other end to the attachment projection 17 on the other side of the base part 4. The sections of the wire 11 run parallel to one another in the region of the upper side 12 and at substantially constant intervals. The wire 11 on the one hand holds the unit 9 firmly on the platform 7 of the base part 4 and on the other hand prevents skin injuries.

The upper part 5 is a one-piece plastic component and initially has a front guide bar 18. This extends parallel to the cutting edges 3 of the razor blades 2 and has a step-like longitudinal profile 19. In the back A cover cap 20 is provided in the area. This has a sliding strip 21 on the upper side. This is convexly curved and initially has a first glide strip leg 22 and a second glide strip leg 22 ′, which is angled at an acute angle thereto, and which are connected to one another by an arc 23. The angle between the sliding strip legs 22, 22 'can also be rectangular or obtuse. The two sliding strip legs 22, 22 'are essentially flat or slightly convex. The production of such a sliding strip 21 is possible by means of a special hot molding process. The particular advantage of this sliding strip 21 is that it is also more effective at the end of the razor blade unit. Since the skin is stretched and pressed in during shaving, a bulge forms at the end of the razor blade unit. The sliding strip 21 shaped in the radius slides better in this area and thus increases the gentle shave.

The front guide strip 18 and the rear cover cap 20 are connected to one another by side walls 24. Between these parts there is an opening 25 in the area of the cutting edges 3 of the razor blades 2, as can be seen in particular from the top view according to FIG. 1.

Both the inside of the guide bar 18 and the inside of the cover cap 20 have receiving grooves 26 for the wire 11. Underneath the guide bar 18 there are recesses 27 which engage in a corresponding manner with the projections 14 of the base part 4. On the rear side, the upper part 5 formed from the guide strip 18, the cover cap 20 and the side walls 24 has through openings 28 which correspond to corresponding through openings in the spacer 8.

In the fully assembled state, the upper part 5 is plugged onto the base part 4 with the unit 9 fastened by the wire 11 and secured from above, for example by latching or in another way. Where the upper part 5 has receiving grooves 26 on the inside, the wire 11 runs therein.

The course of the wire 11 in the area of the top 12 has the advantage that the bottom 29 of the plastic body 1 remains free and corresponding fastening systems can thus be provided.

Reference symbol list

1

Plastic body

2nd

razor blade

3rd

Cutting edge

4th

Base part

5

Top

6

Feed-through slot

7

platform

8th

Spacers

9

Razor blade / spacer / razor blade unit

10th

Recess

11

wire

12

Top

13

front

14

head Start

14 '

head Start

15

approach

15 '

approach

16

back

17th

Fastening projection

18th

Guide bar

19th

Longitudinal profiling

20th

Cover cap

21

Sliding strips

22

Slide leg

22 '

Slide leg

23

arc

24th

Side wall

25th

opening

26

Recording groove

27th

Recess

28

Lead-through opening

29

bottom

Claims (13)

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 (2) is arranged in a plastic body (1),
wherein in the area of the top surface (12) of the razor head that defines the pressure surface on the skin, sections of a wire (11) run parallel to the shaving direction and at a distance from one another, over the cutting edge (s) (3) of the razor blade (s) (2),
characterized,
that the plastic body (1), both in the region of the front (13) and in the region of the rear (16), has guide elements for the wire (11) distributed over the length, with which it extends in a zigzag shape over the top (12) of the razor head and is led back. A razor head according to claim 1, characterized in that the guide elements are designed as projections (14, 14 ') of the plastic body (1) around which the wire (11) is guided. A razor head according to claim 2, characterized in that the width of the projections (14, 14 ') essentially corresponds to the intermediate distances between the projections (14, 14'). A razor head according to one of claims 1 to 3, characterized in that the plastic body (1) preferably has an attachment projection (17) for attaching the two wire ends, preferably in the area of the rear side (16). A razor head according to one of claims 1 to 4, characterized in that the razor blade (2) is inserted into the plastic body (1) essentially from above onto a platform (7) and is held by the wire (11). A razor head according to claim 5, wherein a double razor blade is provided, characterized in that the two razor blades (2) are fastened on both sides of a spacer (8) arranged therebetween, the razor blade / spacer / razor blade unit (9) thus formed essentially is inserted from above onto a platform (7) of the plastic body (1) and is held by the wire (11). A razor head according to one of claims 1 to 6, which has a front guide bar (18), preferably provided with a step-like longitudinal profile (19), and a rear cover cap (20), characterized in that the wire (11) in the region of the guide bar (18 ) and the cover cap (20) below these parts and covered by them. A razor head according to claim 7, characterized in that the guide strip (18) and the cover cap (20) are arranged over side strips, in particular over side walls (24), leaving a central opening (25) in the region of the cutting edge (s) (3) of the razor blade ( n) (2) are connected to one another and the upper part (5) of the plastic body thus formed onto the base part (4) of the plastic body (1) with the razor blade fastened on a platform (7) of the base part (4) by means of the wire (11) (n) (2) and is firmly connected to it. A razor head according to claim 7 or 8, characterized in that the inside of the guide bar (18) and the cover cap (20) facing the wire (11) have receiving grooves (26) for the wire (11). A razor head according to claim 2 and claim 8, characterized in that the upper part (5) has recesses (27) which engage with the projections (14, 14 ') of the base part (4) of the plastic body (1). A razor head according to one of claims 7 to 10, characterized in that the cover cap (20) is provided with a sliding strip (21). A razor head according to claim 11, characterized in that the sliding strip (21) is convexly curved. A razor head according to claim 12, characterized in that the sliding strip (21) has a front, substantially flat or slightly convex curved sliding strip leg (22) and an angled rear, also essentially flat or slightly convex curved sliding strip leg (22 ') which are interconnected by an arch (23).

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