EP3302901B1 - Beard trimmer with one or more rotating heads having a fixed blade with particular geometry - Google Patents

Description

Object of the invention

The present invention relates to a beard trimmer having one or more rotary cutters with a vertical axis. The cutting mechanism of these rotating heads is equipped with a movable blade and a fixed blade. Each cutting head is surrounded by crown-shaped combs adjustable in height. In use, the combs make it possible to adjust the distance between the cutting mechanism and the skin and thus adjust the cut length of the beard. The mower according to the invention comprises a type of fixed blade with a particular geometry that can be adapted to any type of beard.

State of the art

The beard mowers of the state of the art currently have linear moving and fixed blades whose operation is based on a movement back and forth of the movable blade relative to the fixed blade. This type of mower is usually equipped with a comb that can adjust the cutting length of the beard. Such beard trimmers are for example disclosed in US D 698084 , US 6978547 , US D 486267 , EP 2 766 153 A1 , US D 363809 , US 2013/0042487 , US 7076878 , US D 521683 , and US 4888870 .

There are of course razors with multiple rotating heads that can shave very closely, they can not however used to trim a beard. Razors do not have combs to adjust the distance between the cutting mechanism and the skin. To our knowledge, however, there is no state of the art beard trimmer with rotating heads.

The mowers of the state of the art have a line of straight section at the intersection of movable teeth and fixed teeth. They have the disadvantage of trimming the hair differently depending on the direction of the mowing because the beard hair is most often inclined in one direction as they grow almost never perpendicular to the skin. Thus the mowing result with these mowers is very different depending on the direction of movement on the beard to cut.

Mowers which comprise one or more rotary heads with a vertical axis surrounded by ring-shaped combs and having fixed blades according to the present invention are not known from the state of the art.

Goals of the invention

The present invention aims to provide a beard trimmer with one or more rotary heads surrounded by combs of adjustable length for adjusting the cutting height of the beard, the mower being equipped with fixed blades of particular geometry, and preferably interchangeable to be able to be adapted to any type of beard.

Summary of the invention

• une longueur de dent L3 comprise entre 1 et 3 mm, de préférence entre 1,5 et 2 mm;
• un angle d'ouverture entre les dents α compris entre 20 et 30°, de préférence entre 22 et 28°, de manière particulièrement préférée entre 24 et 27°;
• une largeur des dents L2 à leur extrémité comprise entre 0,3 et 1 mm, de préférence entre 0,4 et 0,9 mm.

The present invention discloses a beard trimmer having one or more rotary cutting heads, said rotary cutting heads having a movable blade and a fixed blade, each head being surrounded by a crown-shaped comb, said comb being adjustable in height. and making it possible to adjust, in use, the distance between said blades and the skin and thus to adapt the cut of the hairs of the beard to the desired length, characterized in that said clipper comprises a fixed blade whose geometry is characterized by:

• a tooth length L3 of between 1 and 3 mm, preferably between 1.5 and 2 mm;
• an opening angle between the teeth α of between 20 and 30 °, preferably between 22 and 28 °, particularly preferably between 24 and 27 °;
• a width of the teeth L2 at their end of between 0.3 and 1 mm, preferably between 0.4 and 0.9 mm.

• la lame fixe comporte entre 24 et 54 dents, de préférence entre 30 et 45 dents, et de manière particulièrement préférée de 32 à 40 dents ;
• le diamètre de la lame fixe est compris entre 12 et 25 mm, de préférence entre 18 et 22mm;
• l'axe médian de l'angle d'ouverture α passe par le centre de la lame fixe ;
• l'axe médian de l'angle d'ouverture α ne passe pas par le centre de la lame fixe ;
• ladite lame fixe est interchangeable ;
• ladite lame fixe et la lame mobile sont interchangeables ;
• ladite tondeuse comporte une, deux ou trois têtes rotatives ;
• le réglage en hauteur des peignes est motorisé et positionnable au demi millimètre près ;
• ledit peigne permet le réglage d'une distance entre le mécanisme de coupe et la peau comprise entre 0 et 20 mm, de préférence entre 1 et 15 mm, et de manière particulièrement préférée entre 2 et 12 mm avec une précision de 0,5 mm.

Preferred embodiments of the invention include at least one or any suitable combination of the following features:

• the fixed blade has between 24 and 54 teeth, preferably between 30 and 45 teeth, and particularly preferably from 32 to 40 teeth;
• the diameter of the fixed blade is between 12 and 25 mm, preferably between 18 and 22 mm;
• the median axis of the opening angle α passes through the center of the fixed blade;
• the median axis of the opening angle α does not go through the center of the fixed blade;
• said fixed blade is interchangeable;
• said fixed blade and the movable blade are interchangeable;
• said clipper comprises one, two or three rotating heads;
• the height adjustment of the combs is motorized and positionable to the nearest half millimeter;
• said comb allows adjustment of a distance between the cutting mechanism and the skin of between 0 and 20 mm, preferably between 1 and 15 mm, and particularly preferably between 2 and 12 mm with an accuracy of 0.5 mm .

Brief description of the figures

• The figure 1 represents a beard trimmer according to the invention comprising three rotary heads. The ring-shaped comb around the rotating heads is shown in three different setting heights. These three settings make it possible, for example, to obtain hair lengths of 2, 6 and 10 mm.
• The figure 2 represents the mower according to the invention with respectively one or two cutting heads
• The figure 3 schematically represents the mechanism for adjusting the height of the combs.
• The figure 4 is a detail view of the setting of the cutting height and the cutting mechanism.
• The figure 5 a detailed view of the arrangement of movable and stationary blades on a vertical axis and the key parameters of the fixed blade.
• The Figures 6 to 9 represent three illustrative examples of sizing of the fixed blade according to the invention.

List of reference symbols

1. 1. Circular rotating head with vertical axis
2. 2. Moving blade
3. 3. Fixed blade
4. 4. Crown-shaped comb surrounding the cutting head
5. 5. Hood

Detailed description of the invention

Unlike beard trimmers of the state of the art, the mower according to the present invention has one or more circular rotary heads 1 vertical axis, surrounded by combs 4 in the form of a crown whose height is adjustable to half millimeter. This setting can be manual or motorized (not shown) This mower allows movement in arcs of circles on the beard just like a razor with rotating heads. This type of movement has the advantage of cutting the size of the hair from all sides, regardless of the inclination of the latter with respect to the skin, which results in an even size of the beard.

The movement of the combs 4 straightens the hairs that end up penetrating from the outside to the inside via the space left between two teeth in the waist area. The particular shape of the teeth of the comb 4, which gradually tapers towards the tip, allows easy penetration of the beard hair towards the cutting element composed of a fixed blade 3 and a movable blade 2.

The height of the telescopic combs 4 can be set approximately between 0 and 15 mm, preferably between 0 and 12 mm, and particularly preferably between 0 and 10 mm. The combs are almost completely retractable in the hood 6 to take up less space when storing the mower.

The cover 5 surrounding the rotating head or heads is removable to facilitate the cleaning of the cutting mechanism.

The fixed blade 3 has radial notches where the notches form a symmetrical or asymmetrical angle with the line joining the axis of the fixed blade, which promotes the penetration of the hairs in the cutting mechanism.

The thickness of the hair of a beard and their density is very variable from one person to another. It is therefore sometimes difficult to predict which type of fixed blade will operate optimally for the user. This is the reason why the mower according to the invention comprises movable and fixed blades which are preferably interchangeable. In a preferred embodiment of the invention, the mower may be accompanied by a set of interchangeable blades.

In addition, blade wear may also be greater than razor blade wear, which may require more frequent blade replacement.

The key parameters of the fixed blade are represented at figure 5 . L1 represents the distance between the teeth of the fixed blade on the outer diameter thereof. L2 represents the width of the end of the tooth on the outer diameter of the blade. L3 represents the length of the tooth and α represents the opening angle between two teeth of the fixed blade.

The fixed blades may have a very variable tooth length L3. It can vary from 0.5 to 4 mm but is generally between 1 and 3 mm, preferably between 1.5 and 2 mm. The length chosen for the teeth must obviously be related to the diameter of the fixed blade and the number of teeth envisaged. Thus, a blade of large diameter, for example 25 mm, and a small number of teeth allows a longer tooth length L3 than with a large number of teeth. The fixed blade generally has between 24 and 54 teeth, preferably between 30 and 45 teeth. The diameter of the fixed blade is generally between 12 and 25 mm, preferably between 18 and 22 mm.

The mechanical constraints and the aggressiveness of the contact with the skin also force the blade manufacturer to maintain a certain tooth width L2 at their end. Here, the latitude is generally between 0.3 and 1 mm, preferably between 0.4 and 0.9 mm.

Furthermore, the dimensions L2 and L3 of course determine the opening angle α and therefore L1 for the same diameter. The opening angle α is generally between 20 and 30 °, preferably between 22 and 28 °. This opening angle α is defined by a median axis which does not have to go through the center of the fixed blade. In this case, we will speak of "asymmetrical angle".

It is understood that the present invention excludes L2, L3 and α dimensional combinations that are geometrically impossible and that one skilled in the art will only consider combinations of parameters that are technically feasible. Illustrative examples of sizing are given to Figures 6 to 9 .

Examples Example 1

The figure 6 represents a fixed blade with 40 teeth and an opening angle between the teeth symmetrical with respect to the radius of the fixed blade. In this example, L3 = 1.9 mm; L2 = 0.6 mm and α = 22 °.

Example 2

The figure 7 represents a fixed blade with 32 teeth and an angle of opening between the teeth symmetrical with respect to the radius of the fixed blade. In this example, L3 = 1.8 mm; L2 = 0.8 mm and α = 26.1 °.

Example 3

The figure 8 represents a fixed blade with 32 teeth and an opening angle between the teeth asymmetrical with respect to the radius of the fixed blade. In this example, L3 = 2 mm; L2 = 0.6 mm and α = 26.1 °.

Example 4

The figure 9 represents a fixed blade with 40 teeth and an opening angle between the teeth symmetrical with respect to the radius of the fixed blade. In this example, L3 = 1.8 mm; L2 = 0.4 mm and α = 26.1 °.

Claims (10)

1. A beard trimmer comprising one or several rotary cutting heads (1), said rotary cutting heads comprising a moving blade (2) and a fixed blade (3), each head being surrounded by a crown-shaped comb (4), said comb (4) being height adjustable and making it possible to adjust, in use, the distance between said blades (2, 3) and the skin and thus to adapt the cutting of the beard hairs to the desired length, characterized in that said trimmer comprises a fixed blade, the geometry of which is characterized by:

   - a tooth length L3 comprised between 1 and 3 mm, preferably between 1.5 and 2 mm;

   - an opening angle between the teeth α comprised between 20 and 30°, preferably between 22 and 28°, and particularly preferably between 24 and 27°;

   - a tooth width L2, at the end of the teeth, comprised between 0.3 and 1 mm, preferably between 0.4 and 0.9 mm.
2. The beard trimmer according to claim 1, characterized in that said fixed blade comprises between 24 and 54 teeth, preferably between 30 and 45 teeth, and particularly preferably from 32 to 40 teeth.
3. The beard trimmer according to any one of the preceding claims, characterized in that the diameter of the fixed blade is comprised between 12 and 25 mm, preferably between 18 and 22 mm.
4. The beard trimmer according to any one of the preceding claims, characterized in that the median axis of the opening angle α passes through the center of the fixed blade (3).
5. The beard trimmer according to any one of the preceding claims, characterized in that the median axis of the opening angle α does not pass through the center of the fixed blade (3).
6. The beard trimmer according to any one of the preceding claims, characterized in that said fixed blade (3) is interchangeable.
7. The beard trimmer according to any one of the preceding claims, characterized in that said fixed blade (3) and the moving blade (2) are interchangeable.
8. The beard trimmer according to any one of the preceding claims, characterized in that said trimmer comprises one, two or three rotary heads (1).
9. The beard trimmer according to any one of the preceding claims, characterized in that the adjustment of the height of the combs (4) is motorized and may be positioned to within half a millimeter.
10. The beard trimmer according to any one of the preceding claims, characterized in that said comb (4) makes it possible to adjust a distance between the cutting mechanism and the skin comprised between 0 and 20 mm, preferably between 1 and 15 mm, and particularly preferably between 2 and 12 mm with a precision of 0.5 mm.

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