EP1370397B1 - Shaving system for a dry shaver - Google Patents

Abstract

A shaving system for a dry shaver has at least one long-hair cutter arranged between shaving units for short-hair cutting. The shaving units for short-hair cutting each include an upper blade and a lower blade, which can be moved relative to one another by a drive. The long-hair cutter is formed from at least two cutting elements that can be moved relative to one another and are arranged one beside the other. The cutting elements of the long-hair cutter are each of comb-like design, and their rows of cutting teeth, which are formed by tines, are oriented essentially perpendicularly to the skin which is to be shaved.

Description

The invention relates to a shaving system for a dry shaver according to the preamble of claim 1.

From the JP 10 235 035 A is such a shear system is known, the middle cutting element biased by a spring element by the two outer cutting elements in the upper and lower boundary region is slidably guided.

Another shear system is out of the DE 43 12 060 C1 known, the central cutter has an upper knife with threading elements, which are aligned parallel to the skin to be shaved. Although can be achieved with such a shaving head in practical use very good shaving results at the same time very gentle on the skin, but it may sometimes come in the shaving of directly adjacent to the skin whiskers to delayed threading, so that this skin several times with the shaver must be run over to achieve an optimal shaving result.

The same applies to a shaving head according to the DE-OS 15 53 659 , which shows two arranged between two Kurzhaarschneidsystemen long-hair trimmer, which are each folded in opposite directions of rotation by an angle of approximately 45 ° from the longitudinal plane of the razor.

The invention is therefore an object of the invention to provide a skin-friendly working low-friction shear system with central cutter whose cutting properties ensures optimum cutting performance even when shaving of beard directly on the skin whiskers.

This object is achieved by the characterizing features of claim 1.

The comb-shaped and perpendicular to the skin-oriented cutting elements of the long-hair trimmer allow both a tensing of the skin and a pre-combing the whiskers to be cut. Whiskers protruding from the skin are pre-combed by the long-hair trimmer and folded in the direction of the skin. The skin is tautened at the same time by contacting by means of the comb-shaped cutting elements. Surprisingly, it has been shown in practical shaving experiments that the inventive Alignment of the cutting elements has no negative effect on the skin care during shaving.

The shear system according to the invention provides that the long-hair trimmer consists of three cutting elements, wherein the central cutting element is movable relative to the two outer cutting elements, whereby a particularly skin-friendly and regardless of the direction of shaving particularly thorough shaving is possible. The cutting blade thus cuts on both sides between the two cutting combs. This symmetrical design ensures that both the combing of the whiskers and the tensing of the skin is always done with a stationary, that is not driven cutting comb, the moving cutting elements (the cutting blade) is now placed protected between the two cutting combs.

The cutting teeth rows of the cutting elements are aligned parallel to each other, however, the cutting element planes are arranged in a downwardly opening acute angle to each other, resulting in a friction-reducing acting line between the cutting elements. The angle should be less than 5 °, preferably 2-3 °.

It has a particularly positive effect on the threading behavior of whiskers when the tooth tips of one of the cutting elements are lowered relative to the tooth tips of at least one further cutting element with respect to the skin surface to be shaved. In order to obtain optimal skin care and the best possible Einfädelverhalten the beard hair regardless of the direction of shaving, it is advantageous if the central cutting element is lowered relative to the outer cutting elements.

In order to remove cut or threaded hair as quickly as possible from the cutting area, it is advantageous if the tooth base of at least one of the cutting teeth rows is lowered relative to the tooth base and at least one further tooth cutting row.

A further advantageous embodiment of the invention provides that mutually facing side surfaces of the cutting elements are provided with a plurality of recesses and / or openings. This embodiment allows on the one hand the inclusion of lubricants to reduce friction, in addition, through these profiled side surfaces a hair between these side surfaces grated hair by the relative movement between the cutting elements and thus be removed. As a result, a bending or unfolding of the cutting elements in the cutting area can be prevented.

In order to avoid snagging of the cutting teeth and to achieve distribution of the cutting events along the rows of cutting teeth, in another preferred embodiment the invention provided that adjacent cutting teeth rows have a different pitch.

Other objects, features, advantages and applications of the present invention will become apparent from the following description of the embodiments. All described or illustrated features alone or in any combination form the subject matter of the present invention, regardless of their inclusion in the claims or their dependency.

This shows:

Fig. 1

a cross section through a shear system according to the invention,

Fig. 2

an exploded view of the center cutter according to the invention,

Fig. 3

a side view of the long-hair trimmer according to Fig. 2 in assembled condition,

Fig. 4

shows a partially assembled long hair trimmer and

Fig. 5

a perspective view of a specific embodiment of the central cutting blade.

Fig. 1 shows a cross section through an inventive shaving system in the form of a razor shaving head in the form of a removable frame 1, which can be connected in a conventional manner with the housing of a dry shaver. The removable frame 1 carries two U-shaped curved shear plates 2, which together with an associated lower blade 3, which is driven by a corresponding drive of the dry shaver, for example in the form of an electric motor provided in the housing of the dry shaver driven eccentric or a crank drive, oscillating , which form two shear units for the short haircut.

The lower blade 3 are formed in a conventional manner as so-called blade tube blocks, which are made of a tubular steel element which has been processed by a plurality of transverse slots which extend approximately over half the diameter, so that the remaining webs sharp edged blades form. On the side facing away from the shaving foil 2 side of the lower blade 3 each coupling elements are mounted, which bring in the assembled state, the lower blade with the drive.

In the drawing, only one of the two lower blade 3 is shown. The drive and the housing of the dry shaver were also not shown graphically for clarity.

The two shear films 2 are attached with their downwardly pointing legs each at one of two outer webs 4 and one of two inner webs 5 of the removable frame 1 of the symmetrical to the center plane A shaving head. The outer and inner webs 4 and 5 are interconnected by side portions 6 of the removable frame 1.

Between the two shear films 2, which together with the associated lower blades 3 form the cutting units for the short haircut, the long-hair trimmer 10 is arranged centrally, which is connected to the side portions 6 of the removable frame 1 by means of a Einklipsverbindung. The long-hair trimmer 10 will now be described in detail with reference to the following figures in terms of structure and function.

All figures clearly show the coupling element 11, which is fixedly connected to the central cutting element, namely the cutting blade 12, wherein the coupling element 11 is brought into engagement with the drive of the dry shaver for oscillating actuation of the cutting blade 12 after attaching the removable frame 1 on the housing of the dry shaver becomes. This engagement can be done either directly or indirectly, for example by coupling the cutting blade 12 in a connected to one of the lower blade 3 component. As Fig. 2 can be seen, the oscillating drivable cutting blade 12 between two stationary in the removable frame 1 arranged outer cutting elements, the cutting combs 13 and 14, is provided.

The cutting blade 12 and the two cutting combs 13 and 14 are made of a steel sheet, while the coupling element 11 is made of plastic. The cutting combs 13 and 14 are connected to a respective plastic carrier 15 and 16 respectively. The two assembled from cutting comb 13 and 14 and plastic carrier 15 and 16 assemblies are identical, so that they can be used twice per long hair trimmer 10, which can reduce the number of parts used. Due to this design similarity, the description of individual elements of this module of course applies to the corresponding second module.

On the cutting edges 13, 14 facing away from the plastic carrier 15, 16 recesses 17, for receiving the curved ends 18 of the brackets 19, which press the two outer cutting elements under elastic bias against the central cutting element. Thus, the brackets 19 allow both a Vorspannkrafterzeugung as well as a pre-assembly of the long-hair trimmer.

The cutting blade 12 has an upwardly and in the assembled state outwardly from the shaving head facing row of teeth 20, the teeth 21 are directed away from the coupling element 11. The cutting blade 12 is further provided with two elongated holes 22 which extend parallel to the row of teeth 20. These slots 22 are covered with a rim 23 made of plastic. By means of the slots 22, the cutting blade 12 is guided on guide pin 24, so that only a limited displacement parallel to the row of teeth 20 is possible. The guide pins 24 have flat running surfaces 25 which extend in the same direction as the elongated holes 22, and two semi-circular end portions 26. Each plastic carrier 15, 16 has such a guide pin 24 which extends through the corresponding cutting comb 13, 14 therethrough. After assembly, it engages in a corresponding recess 27 of the complementary plastic carrier.

For accurate fit assembly and attachment of the two plastic carrier 15 and 16 together, the star-shaped clamping pin 28 which extends in the same direction as the guide pin 24 and is pressed for clamping in the bore 29 of the plastic carrier. Offset laterally outward relative to the recesses 27 or the guide pin 24, the cutting combs 13, 14 have through holes into which rivet heads 30, which are formed on the plastic carrier 15, 16, protrude. These are used to attach the cutting combs to the plastic carriers and are by means of a so-called Warm Verstemmvorganges heated during assembly by heat application and then deformed like a rivet head 30 such that no protrusion over the cutting combs in the direction of the cutting blade to ensure a free displacement of the cutting blade 12 relative to the cutting combs 13; however, within the through-bores, the rivet heads 30 are deformed to maintain a radial clamping force between the plastic part and the metal cutting comb. However, the plastic carriers 15, 16 can also be molded directly onto the cutting combs 13, 14 by injection molding.

Each plastic carrier side has a cover 31, as the space between the two shaving foils 2 closes after installation of the trimmer, and an elastically deformable latching hook 32, which serves to lock the finished long-hair trimmer with the two side portions 6 of the removable frame 1.

Each of the cutting blade 12 facing surface of the cutting comb 13 and 14 is provided with a plurality of recesses 33, on the one hand to receive lubricant to reduce friction; On the other hand, it also very quickly rubbed between these contact surfaces hair dust, whereby a gap in the cutting area or a bending of the cutting combs or the blade is prevented by a beard in this contact area beard hair.

Fig. 5 shows a cutting blade 12, which with a plurality of recesses 40, which may also be formed as openings, at the two the associated cutting combs 13, 14 facing surfaces. In addition, the teeth of the row of teeth 20 are provided with openings or recesses 41, whereby the effect just mentioned is still increased. Both the recesses and the openings are produced by means of an etching process.

The rows of teeth 34 of the cutting combs 13, 14 are formed in comparison to the row of teeth 20 of the cutting blade 12 with a much larger tooth height. In the mounted state, the tooth tips 35 of the rows of teeth 34 project beyond the tooth tips of the row of teeth 20, whereby a particularly good combing of the beard to be shaved and raising possible flat hairs resting on the skin is achieved with maximum skin protection. This height difference of the tooth tips is especially in Fig. 4 clearly shown. For once To remove cut beard hair as quickly as possible from the cutting area of the tooth base of the rows of teeth 34 of the cutting combs 13, 14 is clearly, so about 1 to 1.5 mm lower than the tooth base of the row of teeth 20 of the cutting blade. As a result of this difference in the level of the respective tooth base, a trimmed beard hair arising in the cutting area automatically falls outwards and thus can not obstruct further cutting operations.

As in particular in Fig. 4 illustrated, the pitch of the row of teeth 20 is slightly larger than the pitch of the row of teeth 34, whereby a hooking between the cutting blade 12 and the cutting combs 15, 16 is prevented. At the same time, this difference in pitch ensures that not all of the cutting events occur simultaneously along the rows of teeth, resulting in a rounder run.

In Fig. 1 It can be seen that the cutting blade 12 is aligned so that it comes to rest in the center plane A. In contrast, the cutting combs 13, 14 arranged laterally for this purpose are provided in one embodiment of the long-hair trimmer 10 in such a manner that they form an acute angle which opens downwards. The deviation from the center plane A is only a few degrees. This slight inclination of the cutting combs 13, 14 relative to the cutting blade 12 has the consequence that there is only a line of contact between the sliding metal parts, which significantly reduces the friction occurring against a flat support.

As skin protection and especially skin-friendly Vorkämmen the whiskers to be cut on the plastic supports 15, 16 of the rows of teeth 34 upstream combs 36 are formed with a rounded contour and with the rows of teeth 34 identical division. By appropriate pressing of these combs 36 to the skin to be shaved and a tensing of the skin can take place during shaving, whereby an optimal cutting result is favored. For this purpose, it is particularly advantageous if the teeth of the combs 36 with respect to the teeth of the row of teeth 34 at an angle of approximately 45 ° to the outside, that is, according to the in Fig. 3 shown view to the front or to the rear, are issued.

As Fig. 3 shows, the teeth of the rows of teeth 34 of the cutting combs 13, 14 and those of these upstream combs 36 are aligned with each other, so that in the view shown there, the cutting comb 13 associated teeth including the Teeth of the combs 36 are covered by the cutting comb 14 associated teeth. However, another embodiment not graphically illustrated the long-hair trimmer is characterized in that an offset is provided between said teeth. The maximum offset would thus be half the pitch of the rows of teeth 34. By this offset is achieved that with the highest probability when crossing the skin to be shaved no hair passes through the long-hair trimmer without being acted upon by one of the combs 36 or the cutting combs 13, 14 , By this measure it is ensured that in particular all lying flat on the skin and aligned in the direction of shaving hair on an obstacle, so a comb tooth meeting, whereby they can be lifted and cut.

When shaving with the shaving head described short hair are first shaved by means of Kurzhaarschneidsystems consisting of the shaving foil and the associated lower blade 3, while longer hair, which may also lie flat against the skin, are aligned by the long-hair trimmer 10 in the direction of shaving and between the cutting combs 13, 14 and the cutting blade 12 are cut off. The long-hair trimmer 10 following shorthair cutting then shaved off the shortened by the long-hair trimmer beard hair thoroughly.

Claims (7)

1. A shaving system for an electric razor made up of at least one long hair trimmer (10) situated between shaving units for cutting short hair, the shaving units for cutting short hair each being made up of an upper blade and a lower blade (2, 3) that are movable relative to one another by a drive, and the long hair trimmer being made up of at least two cutting elements (12, 13, 14) that are movable relative to one another and are situated alongside one another, the cutting elements (12, 13, 14) of the long hair trimmer each being fashioned in the shape of a comb, and their rows of cutting teeth (20, 34), formed by tines, being oriented so as to point toward the skin to be shaved, essentially perpendicular thereto, and the long hair trimmer (10) being made up of three cutting elements (12, 13, 14), the center cutting element (12) being movable relative to the two outer cutting elements (13, 14), characterized in that the rows of cutting teeth (20, 34) of the cutting elements are oriented parallel to one another, but the planes of the cutting elements run at an acute angle to one another, opening downward.
2. The shaving system according to Claim 1, characterized in that the angle is smaller than 5°, preferably 2 to 3°.
3. The shaving system according to one of the preceding claims, characterized in that the tips of the teeth of one of the cutting elements (12) are lowered relative to the tips of the teeth (35) of at least one additional cutting element (13, 14) relative to the skin surface that is to be shaved.
4. The shaving system according to one of the preceding claims, characterized in that the center cutting element (12) is lowered relative to the outer cutting elements (13, 14).
5. The shaving system according to one of the preceding claims, characterized in that the tooth base of at least one of the rows of cutting teeth (34) is lowered relative to the tooth base of at least one additional row of cutting teeth (20).
6. The shaving system according to one of the preceding claims, characterized in that side surfaces facing one another of the cutting elements (12, 13, 14) are provided with a multiplicity of recesses (33, 40) and/or breaches (41).
7. The shaving system according to one of the preceding claims, characterized in that adjacent rows of cutting teeth (20, 34) have different gappings.

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