RU2825740C1 - Cutting element for razors with plurality of blades, which have narrow platform to facilitate rinsing/welded blade on holder with narrow platform section - Google Patents

Abstract

FIELD: personal use items.

SUBSTANCE: invention relates to shaving devices. Shaving head comprises a protective housing, first and second blades. First blade comprises a first cutting element and a holder. First cutting element comprises a section with a cutting edge and a mounting section. Section with cutting edge represents cutting edge. Mounting section extends from section with cutting edge in direction opposite to cutting edge. Mounting section is installed on the holder. Second blade comprises second cutting element with cutting edge. Cutting edges of the first and second cutting elements are parallel to each other and are located so that they can contact the skin simultaneously during shaving. Blade gap between the first and second blades is in range of 0.25 mm to 0.55 mm. Blade spacing between the first and second cutting elements ranges from 0.90 mm to 1.60 mm. Invention also includes a razor and a method of making such a razor head.

EFFECT: disclosed is a cutting element for razors with a plurality of blades, which have a narrow platform to facilitate rinsing / welded blade on a holder with a narrow platform section.

15 cl, 11 dwg

Description

Cross reference to related application

[1] This application is a national phase application of International Application No. PCT/EP2021/054658, filed on February 25, 2021, now published as WO2021185550, and claims priority from European Patent Application EP 20163838.4, filed on March 18, 2020, the entire contents of which are incorporated herein by reference.

AREA OF TECHNOLOGY

[2] The present disclosure relates to the field of shaving and in particular to a shaving head and blade therefor.

LEVEL OF TECHNOLOGY

[3] A razor head is a shaving apparatus that includes one or more blades (each having at least one cutting edge) and a protective housing to which the one or more blades are attached. Razor heads are commonly used in safety razors, such as removable blade razors (in which the blade is removable from the protective housing), disposable razors (in which the razor head and an associated manipulation portion, such as a handle, are replaceable at the same time), and cartridge razors (in which the razor head is removable and replaceable separately from the manipulation portion).

[4] When the shaving head includes at least two blades, it can be understood that said blades are assembled with each other when they are both attached to the protective housing.

[5] When the shaving head includes two or more blades that are arranged to simultaneously contact the skin during shaving with their respective cutting edges, the cutting edge of the first of said two or more blades may be substantially parallel to the cutting edge of the second of said two or more blades.

[6] When a plurality of cutting edges are arranged to contact the skin simultaneously during shaving, it can be understood that said cutting edges lie in the shaving surface or are offset relative to it. During shaving, the cutting edges move along the skin along a shaving path, which lies on the shaving surface, perpendicular to the cutting edges. Hair removal occurs when movement along the shaving path occurs in accordance with the shaving direction. The shaving surface is defined as a plane tangent to the front and rear points of contact with the skin (relative to the shaving direction) of the shaving head. The exposure of the blade of the shaving head is determined by the distance by which the cutting edge (edges) is offset from the shaving surface, measured along the normal to the shaving surface.

[7] Users often rate their satisfaction with a given shaving head based on factors such as comfort and ease of use during shaving. During shaving, debris such as hair and/or skin cells and/or sebum may accumulate in the shaving head, possibly in combination with one or more shaving products such as shaving cream or shaving oil. One factor that may influence users' perceptions of the ease of use of a shaving head may be the relative ease with which such debris is dislodged from the shaving head.

DISCLOSURE OF THE ESSENCE OF THE INVENTION

[8] Therefore, it is desirable to provide a shaving head that is easy to clean. According to examples of the present invention, a shaving head can be provided. The shaving head includes a protective housing, a first blade and a second blade. The first blade includes a first cutting element and a holder. The first cutting element includes a section with a cutting edge and a mounting section. The section with a cutting edge includes a cutting edge. The mounting section extends from the section with a cutting edge in a direction opposite to the cutting edge. The mounting section is mounted on the holder. The second blade includes a second cutting element. The second cutting element includes a cutting edge. The first and second blades are located directly next to each other. The cutting edges of the first and second cutting elements are substantially parallel to each other and are located with the possibility of simultaneous contact with the skin during shaving. The interblade gap between the first and second blades is in the range from 0.25 (millimeters) mm to 0.55 mm. The interblade gap is the minimum distance between immediately adjacent blades. The interblade gap between the first and second cutting elements is in the range from 0.9 mm to 1.60 mm. The interblade gap is the minimum distance between two immediately adjacent cutting edges.

[9] Such a shaving head can be characterized by high rinsing properties and at the same time be perceived by users as comfortable during shaving.

[10] The cantilever length of the first blade may range from 0.5 mm to 1 mm, or from 0.55 mm to 1 mm, or from 0.55 mm to 0.88 mm.

[11] The holder may include a platform portion on which the mounting portion is mounted. The platform portion may extend along the mounting portion. The holder may include a support portion extending obliquely or perpendicularly from the platform portion for assembling the first blade in the protective housing.

[12] The support section may have a thickness of 0.1 mm to 0.3 mm when measured perpendicular to the inner surface of the support section.

[13] The platform section may have a length of 0.5 mm to 0.9 mm. The length of the platform section may be measured along the mounting section from the inner vertex formed by the surfaces of the platform and support sections facing each other, in the direction of the cutting edge of the section with the cutting edge.

[14] The ratio of the length of the platform section to the length of the first blade can range from 0.33 to 0.64.

[15] The length of the first blade can be measured along the mounting section from the inner tip to the cutting edge.

[16] The outer surface of the support portion may face away from the platform portion. The width of the first blade may be in the range of 0.9 mm to 1.70 mm. The width of the first blade may be measured from the outer surface of the support portion to the cutting edge of the portion with the cutting edge in a direction perpendicular to the outer surface of the support portion.

[17] The overlap length between the first and second blades may be in the range of 0 mm to 0.55 mm.

[18] The holder may be located between the first cutting element and the second blade. Alternatively, the first cutting element may be located between the holder and the second blade.

[19] The first cutting element may be located on the surface of the holder facing the skin during shaving.

[20] The first cutting element may be located on a surface of the holder that faces away from the skin during shaving.

[21] A razor may be provided that includes a razor head as described above herein.

[22] The razor may include a vibrator.

[23] A method for producing a razor head as described above in this document is also provided. The method includes providing a first blade and providing a second blade, and assembling the first and second blades together.

[24] Providing a first blade may include providing a holder and providing a first cutting element. Providing the holder may include providing a flat element and bending the flat element to obtain the holder. The holder may include a support portion for assembling the first blade with the second blade and a platform portion on which the first cutting element can be mounted. The platform portion may extend obliquely or perpendicularly from the support portion. When providing the first blade, there may be no step of removing material from the platform portion of the holder following the bending step.

[25] Assembling the first and second blades together may include securing the second blade to the protective housing and securing a support portion of the first blade to the protective housing.

[26] The method may include the step of measuring the rinsability of the shaving head.

[27] A process for measuring the rinsability of a shaving head for such a method is also provided. The process includes installing the shaving head downstream of a liquid dispensing device and upstream of a first flow path and a second flow path that is separated from the first flow path, so that liquid dispensed from the liquid dispensing device is delivered to the shaving head, and so that liquid passing through the shaving head is directed along the first flow path, and liquid bypassing the shaving head is directed along the second flow path. The process includes dispensing a known amount of liquid from the liquid dispensing device. The process includes measuring the amount of liquid directed along the first flow path and/or the amount of liquid directed along the second flow path.

[28] The process may include placing a spacer between the shaving head and the boundary of the first flow path.

BRIEF DESCRIPTION OF DRAWINGS

[29] The disclosure may be more fully understood by considering the following detailed description of aspects of the disclosure in conjunction with the accompanying drawings, in which:

[30] FIG. 1A shows the arrangement of the blades of the reference razor head;

[31] FIG. 1B is a schematic representation of the relationship between the geometric shape of the shaving head and the user's sensation;

[32] FIG. 2A shows an exemplary arrangement of blades for an exemplary razor head;

[33] FIG. 2B shows the first blade shown in FIG. 2A;

[34] FIG. 3 shows a comparison of the reference blade shown in FIG. 1A and the example blade shown in FIG. 2B;

[35] FIG. 4 shows the accumulation of debris on the reference blade shown in FIG. 3;

[36] FIG. 5 shows the accumulation of debris on the exemplary blade shown in FIG. 3;

[37] FIG. 6 shows a block diagram of the manufacturing process of the exemplary shaving head;

[38] FIG. 7A is a flow chart of an exemplary process for measuring the rinsability of a shaving head;

[39] FIG. 7B shows a schematic view of a device for measuring the rinsability of a shaving head;

[40] FIG. 8 shows a detailed view of the device shown in FIG. 7B;

[41] FIG. 9 shows the arrangement of the blades of FIG. 1A during rinsing;

[42] FIG. 10 shows the arrangement of the blades of FIG. 2A during rinsing;

[43] FIG. 11 shows an exemplary razor including an exemplary razor head.

[44] The term "exemplary" is used in the sense of "approximate" rather than "ideal." Although aspects of the disclosure are susceptible to various modifications and alternative forms, features thereof are shown by way of example in the drawings and will be described in detail. However, it should be understood that it is not the intent of the invention to limit aspects of the disclosure to the particular embodiment(s) described. On the contrary, it is the intent of the present disclosure to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure.

IMPLEMENTATION OF THE INVENTION

[45] As used in this disclosure and the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. As used in this disclosure and the appended claims, the term "or" is generally used to include "and/or" unless the context clearly dictates otherwise.

[46] The following detailed description should be read with reference to the drawings. The detailed description and drawings, which are not necessarily drawn to scale, depict illustrative aspects and are not intended to limit the scope of the disclosure. The illustrative aspects depicted are intended to be used as an example only.

[47] When an element or feature is referred to herein as being “on,” “interacting with,” “connected to,” or “linked to” another element or feature, it may be directly on, interacting with, connected to, or linked to the other element or feature, or there may be intervening elements or features. Conversely, when an element or feature is referred to as being “directly on,” “directly interacting with,” “directly connected to,” or “directly linked to” another element or feature, there may be no intervening elements or features. Other words used to describe relationships between elements or features should be interpreted similarly (e.g., “between” or “directly between,” “adjacent” or “directly adjacent,” etc.).

[48] Although the terms "first," "second," and the like may be used herein to describe various elements, components, regions, layers, sections, and/or parameters, these elements, components, regions, layers, sections, and/or parameters should not be limited to these terms. These terms are used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Thus, a first element, component, region, layer, or section discussed herein may be referred to as a second element, component, region, layer, or section without departing from the principles of the present invention.

[49] FIG. 1A shows the arrangement of 111 master blades for the master razor head.

[50] In the arrangement 111 of the reference blades, the first reference blade 112A and the second reference blade 112B are arranged such that when the reference shaving head is moved in the shaving direction 700, the first reference blade 112A follows the second reference blade 112B.

[51] The arrangement 111 of reference blades has an inter-blade gap 702 equal to 1.3 mm (millimeters) between the cutting edges 118A, 118B of the first reference blade 112A and the second reference blade 112B. The inter-blade gap is the distance between immediately adjacent cutting edges.

[52] FIG. 1B is a schematic representation of the relationship between the geometric shape of a shaving head and the user's sensation. When a user shaves using a shaving head in which multiple cutting edges contact the skin simultaneously during shaving, the contact of the cutting edges with the skin may be perceived by the user as unpleasant or uncomfortable. User feedback has shown that a shaving head with a relatively large inter-blade gap ("IBS", represented along the lower horizontal axis), an example of which is shown in position 1, may be perceived as less comfortable ("C" user comfort, represented on the upper horizontal axis) than a shaving head with a relatively small inter-blade gap, an example of which is shown in position 2.

[53] However, during shaving, debris can accumulate between immediately adjacent blades, which can result in a reduced shaving performance. Testing and user feedback have shown that a relatively small blade spacing (position 2) can reduce the effectiveness of rinsing in dislodging accumulated debris. In other words, it can reduce the rinsability of the shaving head (rinsability “R” is represented on the right vertical axis). For example, a user may notice that a shaving head with a relatively low rinsability requires a longer and/or more intense and/or more rinsing than a shaving head with a relatively high rinsability.

[54] The inventors realized that the interblade gap ("IBC", represented on the left vertical axis) may have a greater influence than the interblade gap in determining the rinseability of at least some razor heads. The interblade gap is the minimum distance between immediately adjacent blades. The razor heads represented in positions 3 and 4 have larger interblade gaps than the razor heads represented in positions 1 and 2, respectively, and also exhibit higher rinseability than the razor heads represented in positions 1 and 2, respectively. The shaving head shown in position 5 has a rinseability comparable to the shaving head shown in position 2, even though the shaving head shown in position 5 has a smaller interblade gap than the shaving head shown in position 2.

[55] Returning now to FIG. 1A, the arrangement 111 of reference blades has an inter-blade gap 704 of 0.29 mm between the first reference blade 112A and the second reference blade 112B.

[56] The quantitative assessment of rinseability will be discussed in more detail in connection with FIGS. 7A-10.

[57] FIG. 2A shows an exemplary blade arrangement 11 for an exemplary shaving head that includes at least two immediately adjacent and substantially parallel cutting edges 18A, 18B configured to simultaneously contact the skin during shaving. The exemplary shaving head includes at least two blades 12A, 12B. A first blade 12A of the at least two blades includes a first cutting edge 18A of the at least two cutting edges. A second blade 12B of the at least two blades includes a second of the at least two cutting edges 18B. As with the reference blade arrangement shown in FIG. 1A, in the exemplary arrangement 11 of blades, the second exemplary blade 12B precedes the first exemplary blade 12A when the exemplary shaving head is moved in the shaving direction 600.

[58] The inter-blade gap 604 between the first blade 12A and the second blade 12B may be in the range of 0.25 mm to 0.55 mm. Additionally or alternatively, the inter-blade gap 602 between the first cutting edge 18A and the second cutting edge 18B may be in the range of 0.90 mm to 1.60 mm.

[59] For example, in particular, the shaving head, the arrangement of the blades of which is shown in FIG. 2A, may have an interblade gap 602 of 1.3 mm between the first cutting edge 18A and the second cutting edge 18B and an interblade gap 604 of 0.42 mm. Thus, the exemplary shaving head may be perceived by users as comparable to the reference shaving head in terms of shaving comfort and at the same time have greater rinsing than the reference shaving head. However, other combinations of interblade gap and interblade gap may also be considered.

[60] Although the arrangement of the 11 blades is represented as providing the razor head with a blade exposure 606 of 0 μm (microns), it is contemplated that the exposure may be as small as -100 μm (meaning that the cutting edges are recessed into the protective housing by this amount) to 100 μm (meaning that the cutting edges protrude from the protective housing by this amount).

[61] FIG. 2B shows the first blade 12A shown in FIG. 2A.

[62] The first blade 12A includes a cutting element 14A and a holder 30A. The cutting element 14A includes a first cutting edge 18A.

[63] The cutting element 14A is mounted on the holder 30A, for example, connected by welding to it. However, it is also contemplated that this cutting element can be mounted on this holder, for example, by means of glue. The cutting element 14A can be mounted on the surface of the holder facing the skin during shaving. However, it is also contemplated that the cutting element 14A can be mounted on the surface of the holder facing away from the skin during shaving.

[64] The cutting member 14A includes a section 16A with a cutting edge and a mounting section 20A. The section 16A with a cutting edge includes a first cutting edge 18A.

[65] The mounting portion 20A extends from the cutting edge portion 16A in a direction opposite to the first cutting edge 18A. The mounting portion 20A is mounted on the holder 30A.

[66] The cutting member mounting portion 20A includes a mounting surface 22A that faces the holder 30A when the cutting member 14A is mounted thereon.

[67] When the cutting element 14A and the holder 30A are connected to each other, they form a mating surface 410A between them, which is a geometric reference point used to measure certain aspects of the geometric shape of the blade and/or the razor head. For example, the mating surface 410A may coincide with the mounting surface 22A of the mounting portion 20A.

[68] The cutting edge 18A may be formed on the section 16A with the cutting edge by any known method. Accordingly, the cutting edge 18A may or may not coincide with the mounting surface 22A of the mounting section 20A. When the cutting edge 18A of the section 16A with the cutting edge does not coincide with the mounting surface 22A of the mounting section 20A, it can be understood that the mating surface 410A extends from the mounting surface 22A locally tangentially.

[69] As a non-limiting example, the cutting element 14A may have a width in the range of 0.95 mm to 1.68 mm, or, for example, may even be 1.4 mm. The width 608A of the cutting element is the maximum distance that its mounting portion 20A extends from its cutting edge 18A, measured along its mounting surface 22A. When the cutting edge 18A does not coincide with the mating surface 410A, the width 608A of the cutting element can be measured as the maximum distance that the mounting portion 20A extends from the orthogonal projection 412A of the cutting edge 18A onto the mating surface 410A.

[70] As a non-limiting example, the cutting element 14A may have a thickness 610A in the range of 0.05 mm to 0.15 mm, or even 0.074 mm to 0.1 mm. The thickness 610A of the cutting element may be measured normal to its mounting surface 22A.

[71] The cantilever length is the minimum distance from the cutting edge of the portion with the cutting edge of the cutting element of the blade (or its orthogonal projection 412A on the mating surface 410A when the cutting edge does not coincide with the mounting surface 22A) to the portion of the mounting surface 22A that is in contact with the holder 30A. The cantilever length 612A of the first blade 12A can be in the range of from 0.5 mm to 1 mm or from 0.55 mm to 1 mm, or even, for example, from 0.55 mm to 0.88 mm for the first blade 12A. For example, in particular, the first blade 12A shown in FIG. 2B can have a cantilever length 612A equal to 0.62 mm. The cantilever length 612A can promote the flexibility of the cutting edge section 14A, which can improve the adaptation of the blade 12A to the contours of the skin during shaving.

[72] The holder 30A may include a platform portion 32A on which the mounting portion 20A is installed, and a support portion 40A extending perpendicularly or obliquely from the platform portion 32A. The platform portion 32A of the holder may extend along the mounting portion 20A of the cutting element.

[73] The contact length between the mounting portion 20A of the cutting member and the platform portion 32A of the holder may be measured along the mounting portion 20A of the cutting member perpendicular to the cutting edge 18A of the portion with the cutting edge. As a non-limiting example, the contact length 614A between the mounting portion 20A and the platform portion 32A may be in the range of 0.5 mm to 0.90 mm. For example, in particular, the first blade 12A shown in FIG. 2B may have a contact length 614A in the range of 0.48 mm to 0.72 mm or even 0.6 mm between the mounting portion 20A and the platform portion 32A.

[74] The thickness 622A of the platform portion may be measured normal to the mounting portion 20A (for example, normal to the mating surface 410A). For example, the thickness 622A of the platform portion 32A may be in the range of 0.1 mm to 0.3 mm, or even 0.15 mm to 0.3 mm, or even 0.2 mm to 0.3 mm. For example, in particular, the first blade 12A shown in FIG. 2B may have a holder 30A, in which the platform portion 32A has a thickness of 0.28 mm.

[75] The platform portion 32A includes an inner surface 34A and an outer surface 36A, so that the inner surface 34A of the platform portion 32A faces the support portion 40A, and the outer surface 36A of the platform portion 32A faces away from the support portion 40A. The outer surface 36A may face the skin during shaving.

[76] The shapes of the platform portion 32A and the mounting portion 20A may substantially correspond to each other. For example, when the mounting surface 22A is substantially flat, the platform portion 32A may also be substantially flat at least on its outer surface 36A.

[77] The support portion 40A allows the first blade 12A to be held in the protective housing of the shaving head, for example, directly next to the second blade 12B shown in FIG. 2A. The support portion 40A includes an inner surface 42A that faces the platform portion 32A and an outer surface 44A that faces away from the platform portion 32A.

[78] The thickness 626A of the support portion may be measured perpendicular to the inner surface 42A of the support portion 40A. For example, the support portion 40A may have a thickness in the range of 0.1 mm to 0.3 mm, or even 0.15 to 0.3 mm, or even 0.2 mm to 0.3 mm. Additionally or alternatively, for example, the thickness 626A of the support portion may be similar or identical to the thickness 622A of the platform portion. For example, in particular, the first blade shown in FIG. 2B has a holder whose support portion thickness is 0.28 mm.

[79] The inner surfaces 34A, 42A of the platform portion 32A and the support portion 40A form an angle between them, the rays of which lie on the inner surface 34A of the platform portion 32A and the inner surface 42A of the support portion 40A, and the apex of which is known as the “inner apex” 430A.

[80] The length 620A of the platform portion may be measured along the mounting portion (for example, along the mating surface 410A) perpendicular to the cutting edge 18A of the portion with the cutting edge of the cutting element of the blade from the inner vertex 430A (or the orthogonal projection of the inner vertex onto the mounting surface 22A or the mating surface 410A, when said inner vertex 430A does not coincide with it) in the direction toward said cutting edge 18A (or its orthogonal projection 412A onto the mating surface 410A, when said cutting edge 18A does not coincide with it) to the extreme point closest to the cutting edge of the orthogonal projection of the platform portion onto the mating plane.

[81] For example, the platform portion 32A may have a length 620A in the range of 0.5 mm to 0.9 mm, or even 0.7 mm to 0.9 mm. For example, in particular, the first blade 12A shown in FIG. 2B may have a holder 30A with a length 620A of the platform portion 32A of 0.80 mm.

[82] As a non-limiting example, the support portion 40A may extend from the platform portion 32A at a so-called bending angle 624A in the range of from 64° (degrees) to 72°, measured between the outer surfaces 44A, 36A of the support portion 40A and the platform portion 32A. The bending angle 624A corresponds to the amount by which the flat member is bent to form the support portion 40A and the platform portion 32A during the manufacture of the holder 30A.

[83] The length 621A of the blade may be measured from the inner vertex 430A (or its orthogonal projection onto the mating plane 410A) to the cutting edge 18A (or its orthogonal projection onto the mating plane 410).

[84] Returning now to FIG. 2A, it can be seen that the holder 30A can be located between the cutting element 14A of the first blade and the second blade 12B, for example, in such a way that a line drawn from the extreme point of the cutting element 14A of the first blade, distant from its cutting edge 18A, to the second blade 12B, can intersect the holder 30A of the first blade. The cutting element 14A of the first blade is located on the surface of the platform portion 32A, which faces the skin during shaving.

[85] However, it is also contemplated that the cutting element 14A of the first blade may be located between the holder 30A and the second blade 12B, for example, in such a way that a line drawn from the mounting surface of the first blade to the second blade 12A may intersect the cutting element 14A of the first blade. The cutting element 14A of the first blade may be located on the surface of the platform portion 32A that faces away from the skin during shaving.

[86] The blade height is the maximum distance between the blade holder and the cutting edge, measured normal to the shaving surface. As a non-limiting example, the height 642A of the first blade may be in the range of 2.00 mm to 3.0 mm, or even 2.1 mm to 2.35 mm.

[87] The "support portion length" of the blade is the distance from the inner vertex 430A of the holder to the outermost point 40A of the support portion 40A that is distal from it. As a non-limiting example, the support portion length 628A of the first blade may be in the range of 0.7 mm to 2.5 mm, or even 1.00 mm to 1.40 mm. For example, the support portion length 628A, in particular of the first blade 12A shown in FIG. 2A, may be 1.38 mm.

[88] The width 644A of the first blade 12A (also known as its so-called "D-dimension") can be measured in a variety of ways. For example, the width 644A of the first blade can be the maximum distance between its cutting edge 18A and the orthogonal projection 414A of the holder 30A onto the shaving surface 440, or, for example, the width 644A of the first blade can be measured from the outer surface 44A of the support portion to the cutting edge 18A of the cutting edge portion of the portion with the cutting edge in a direction perpendicular to the outer surface 44A of the support portion. When, as in the case of, in particular, the first blade 12A shown in FIG. 2A, the outer surface 44A of the support section is located perpendicular to the shaving surface 440, the maximum distance between the cutting edge 18A and the orthogonal projection of the holder 30A onto the shaving surface 440 can be equal to the distance between the outer surface 44A of the support section and the cutting edge 18A of the section with the cutting edge, measured perpendicular to the outer surface 44A of the support section.

[89] As a non-limiting example, the width 644A of the first blade 12A may be in the range of 0.9 mm to 1.70 mm, or even 1 mm to 1.55 mm, or even 1.45 mm to 1.51 mm. For example, in particular, the first blade shown in FIG. 2A may have a width of 1.5 mm. As a non-limiting example, it is also contemplated to provide the first blade 12A, the width 644A of which is 1.48 mm.

[90] The width 630A of the holder may be measured in a variety of ways. For example, it may be the maximum distance between the opposite ends of the orthogonal projection of the blade holder 30A onto the shaving surface 440, measured perpendicular to the cutting edge 18A of the blade, or, for example, it may be the maximum distance between the opposite extreme points 39A, 49A of the support portion 40A and the platform portion 32A of the holder, measured perpendicular to the outer surface 44A of the support portion. When, as in the case of, in particular, the first blade shown in FIG. 2A, the outer surface 44A of the support section is located perpendicular to the shaving surface 440, the maximum distance measured perpendicular to the cutting edge 18A, between the opposite extreme points of the orthogonal projection of the holder 30A onto the shaving surface 440, can be equal to the maximum distance measured normal to the outer surface 44A of the support section, between the opposite extreme points 39A, 49A of the support section 40A and the platform section 32A.

[91] As a non-limiting example, the width 630A of the holder of the first blade 12A may be in the range of 0.60 mm to 1.15 mm. For example, the width 630A of the holder, in particular of the first blade 12A shown in FIG. 2A, may be 0.99 mm.

[92] The "edge offset" of a blade is the difference between the width of its blade and the width of the holder and essentially corresponds to the amount of space available for debris accumulation. Debris accumulation will be discussed in more detail with reference to FIGS. 4 and 5. As a non-limiting example, the edge offset 670A, in particular of the first blade 12A shown in FIG. 2A, may be 0.51 mm.

[93] The width of the first blade is measured along its cutting edge 18A. As a non-limiting example, the width of the first blade 12A may be in the range of 0.95 mm to 1.68 mm.

[94] Although the first blade 12A and the second blade 12B are shown to be identical to each other, it is also contemplated that the second blade 12B may be different from the first blade 12A. When at least a third blade is provided, the first blade 12A and the second blade 12B may be identical to the third blade or may be different from it independently of each other.

[95] The overlap length is the difference between the inter-blade gap between the cutting edge of the front blade (e.g., the second blades 12B and 112B shown at blade locations 11 and 111 in FIGS. 1A and 2A) and the cutting edge of the subsequent blade (e.g., the first blades 12A and 112B shown at blade locations 11 and 111 in FIGS. 1A and 2A) that follows the front blade during shaving, and the width of the front blade (e.g., the width 644B of the second blade 12B in FIG. 2A).

[96] As a non-limiting example, the overlap length 690 between the first blade 12A and the second blade 12B of the exemplary razor head may be in the range of 0 mm to 0.55 mm. For example, in particular, the arrangement of blades 11 shown in FIG. 2A may have an overlap length 690 equal to 0.2 mm.

[97] The shaving head 11 has an edge gap 605, which is a perpendicular distance from the plane 17 containing the cutting edge 18B of the second blade 12B to the cutting edge 18A of the cutting element 14A of the first blade 12A. The plane 17 is generally parallel to the surfaces of the section 16B with the cutting edge of the second blade 12B, which face towards and away from the skin during shaving. As can be seen in FIG. 2A, the plane 17 may even correspond to the central plane of the section with the cutting edge.

[98] The plane 17 and the shaving surface 606 form an angle 625, the rays of which pass from the cutting edge 18B of the second blade 12B to the first blade 12A. The edge gap 605 corresponds to the product of the interblade gap 602 and the sine of the angle 625 between the plane 17 and the shaving surface 606.

[99] The shaving head 11 has a gap 607 between the cutting elements, which is a perpendicular distance between the mating surface 410A of the first blade 12A and the surface of the section 16B with the cutting edge of the second blade 12B, which faces the skin during shaving. The gap 607 between the cutting elements can be measured as the edge gap 606 minus the sum of the perpendicular distance between the cutting edge 18B of the second blade 12B and the surface of the section 16B with the cutting edge of the second blade 12B, facing the skin during shaving, with the perpendicular distance between the cutting edge 18A of the first blade 12A and the mating surface 410A. When these distances are equal, the gap 607 between the cutting elements can be measured as the blade gap 605 minus the thickness of the cutting element 14A of the first blade.

[100] FIG. 3 shows a comparison of the reference first blade 112A shown in FIG. 1A and the exemplary first blade 12A shown in FIG. 2A. For ease of comparison, the holder 130A of the reference blade 112A is shown as being made by bending along the bending axis a flat wire blank of a width (measured perpendicular to the bending axis and covering the extreme points of the blank, subsequently corresponding to the extreme points 139A, 149A of the support and platform sections of the holder 130A) of 2.58 mm, while the holder 30A of the example blade 12A is shown as being made by bending along the bending axis a flat wire blank of a width (measured perpendicular to the bending axis and covering the extreme points of the blank, subsequently corresponding to the extreme points 39A, 49A of the support and platform sections of the holder 30A) in the range from 1.84 mm to 2.76 mm or even 2.30 mm. For ease of comparison, the reference first blade 112A and the exemplary first blade 12A are shown to be identical to each other in terms of their cutting elements 14A, 114A, blade lengths 621A, 721A, thicknesses 726A, 626A, 722A, 622A of their support portions 140A, 40A and platform portions 132A, 32A, and the geometric shapes of the curved portions 50A, 150A at the junctions of their support portions 140A, 40A and platform portions 132A, 32A. A comparison of the reference first blade 112A and the example first blade 12A shows that, despite these similarities, the length 628A of the support portion of the example first blade 12A is 0.08 mm shorter than the length 728A of the support portion of the reference first blade 112A, and the length 620A of the platform portion of the example first blade 12A is 0.2 mm shorter than the length 720A of the platform portion of the reference first blade 112A.

[101] The reduction in the length 628A of the support portion and the length 620A of the platform portion, which is not limited to the specific dimensions indicated above, may allow for a reduction in the amount of material contained in the exemplary shaving head compared to the reference shaving head. This may result, for example, in a reduction in costs and/or environmental impact during manufacturing. Manufacturing will be discussed in more detail with respect to FIG. 6.

[102] The "support ratio" of the blade 12A, 112A is the ratio of the length 620A, 720A of its platform portion to the length of the blade. When the shaving head includes a front blade and a subsequent blade, the edges of which contact the skin simultaneously during shaving, so that the edge of the subsequent blade follows the edge of the front blade during movement of the shaving head in the shaving direction, the rear blade with a relatively large support ratio can correspond to a smaller interblade gap for a given interblade gap and a given front blade than the rear blade with a relatively small support ratio.

[103] As a non-limiting example, the exemplary first blade 12A may have a support ratio in the range of 0.33 to 0.64. For example, in particular, the first blade 12A shown in FIG. 3 may have a support ratio of 0.56.

[104] For example, for two blades 12A, 112A, in which the cutting elements 14A, 114A are identical but differ in support ratio, the blade 12A with a lower support ratio may exhibit a greater ability to accumulate shaving debris (also referred to as “debris accumulation”) than the blade 112A with a higher support ratio.

[105] For example, FIG. 4 shows the debris accumulation for the reference blade 112A shown in FIG. 3, and FIG. 5 shows the debris accumulation for the exemplary blade 12A'. The blade 12A' shown in FIG. 5 differs from the exemplary blade 12A shown in FIG. 3 only in that the blade 12A in FIG. 3 is provided with a groove in the curved portion 50A of its holder 30A, while the blade 12A' in FIG. 5 does not have such a groove in the curved portion of the holder. However, the lengths 628A', 620A' of the support and platform portions for the blade 12A' in FIG. 5 are identical to the lengths of the blade 12A in FIG. 3, and the inner apex 430A' of the exemplary blade 12A' in FIG. 5 is positioned relative to the inner surfaces 36A', 42A' of the platform portion 32A' and the support portion 40A' in the same manner as described in FIG. 2B. The curved portions with and without a notch will be discussed in more detail with reference to FIG. 6.

[106] Since the exemplary blade 12A' and the reference blade 112A have identical cutting elements 114A, 14A', the above-described differences in the lengths of the support portion 40A', 140A and the platform portion 32A', 132A of their respective holders 30A', 130A mean that the exemplary blade 12A' shown in FIG. 5 (as well as the exemplary blade 12A shown in FIG. 3) has a lower support ratio than the reference blade 112A shown in FIG. 4.

[107] In both FIGS. 4 and 5, shaving debris is represented as particles "P" that are substantially circular in shape when viewed along the cutting edge 118A, 18A' of the blade 112A, 12A'. A comparison of FIGS. 4 and 5 shows that the exemplary blade 12A' is capable of storing more debris particles "P" between its cutting edge 18A' and the platform portion 32A' than the reference blade 112A is capable of storing between its cutting edge 118A and the platform portion 132A. Thus, the exemplary blade 12A' exhibits better debris storage than the reference blade 112A. Thus, the same is true for the exemplary blade 12A in FIG. 3.

[108] A blade that exhibits relatively greater debris accumulation may be able to shave a larger area of skin before needing to be rinsed than a blade that exhibits relatively less debris accumulation. Thus, a user of a razor head that includes at least one blade with good debris accumulation may find that the razor head needs to be rinsed less often than a comparable razor head whose blade(s) exhibit poor debris accumulation.

[109] A blade with a relatively low support ratio may also exhibit greater flexibility in its cutting edge region than a blade with an identical cutting edge region but which has a relatively high support ratio. Flexibility in the cutting edge region may facilitate debris displacement and/or may exhibit greater vibration oscillations when used in conjunction with a vibrator. This possibility will be discussed in more detail with respect to FIG. 11.

[110] FIG. 6 shows a flow chart of a process flow for an exemplary method of manufacturing S100 of an exemplary shaving head. Method S100 includes providing S10A a first blade, providing S10B a second blade, and assembling S40 the first and second blades together.

[111] Providing S10A of the first blade may include providing S11A of its holder, providing S19A of its cutting element, and assembling S30A together the holder and the cutting element to obtain a blade.

[112] Providing S11A of the holder may include providing S12A of a flat member and bending S18A of the flat member to obtain the holder. As a non-limiting example, the flat member 52A may have a width 632A equal to 2.30 mm, measured perpendicular to the axis along which S18A is bent, between portions of the flat member subsequently corresponding to the extreme points of the support and platform portions of the holder.

[113] Providing the flat element S12A may include providing a wire of a starting material (e.g., having a diameter in the range of 4 mm to 6.5 mm or even equal to 5 mm) that is flattened by drawing (i.e., using a rolling process (hot rolling or cold rolling) and/or polishing and/or cutting and/or annealing (which improves ductility)) to obtain the flat element 52A. The flat or flattened wire may be made of stainless steel, such as austenitic stainless steel, and/or may have a width in the range of 2 mm to 3 mm or even 2.2 mm to 2.4 mm. The two ends of the flat element may be rounded.

[114] The bending S18A of the flat member forms a support portion 40A and a platform portion 32A of the holder, as well as a curved portion 50A, by means of which the support portion 40A and the platform portion 32A are connected to each other, so that the support portion 40A and the platform portion 32A are located perpendicularly or inclined to each other at least in their respective connections with the curved portion 50A. It is contemplated that the curved portion 50A may have a groove 54A, which may provide a relatively small bending radius of the curved portion 50A or none at all, or that the curved portion 50A may not have grooves, which allows bending to be performed without a groove forming step. The groove 54A may be located, for example, between portions of the surface of the flat member that subsequently correspond to the inner surfaces of the support portion 40A and the platform portion 32A of the holder.

[115] When the groove 54A is to be provided, the flat member 52A may be subjected to the formation of the S14A groove prior to the bending S18A. For example, the formation of the S14A groove may create one or more grooves 54A in the flat member 52A, which may locally increase the susceptibility of the flat member to the bending S18A. The formation of the S14A groove may be carried out using a roller, for example, as described in U.S. Patent No. 9,289,909, and/or, for example, by removing material. As a result, the holder 30A obtained from the flat member 52A that has been subjected to the formation of the S14A groove may have a curved portion 50A that is smaller and/or the bending radius of which is smaller than that of a holder obtained from a flat member of the same size that has not been subjected to the formation of the groove. Providing S12A of the flat element may further include straightening S15A of the flat element after forming groove 54A.

[116] Additionally or alternatively, the flat member may be subjected to a notch S16A before bending. The notch may facilitate, for example, cutting the flat member along the length. The notch may be performed, for example, as described, for example, in U.S. Patent No. 9,289,909.

[117] Bending S18A of the flat member transforms the flat member into a curved member. After bending, the curved member can be cut to length to obtain a holder. Assembling S30A of the cutting member and the holder together can include mounting S34A of the cutting member 14A on the holder 30A. As a non-limiting example, mounting S34A of the cutting member on the holder can be accomplished by welding the mounting portion 20A of the cutting member to the platform portion 32A of the holder.

[118] Before mounting S34A of said element on the holder, the cutting element 14A and the holder 30A may be subjected to positioning S32A to position the mounting portion 20A on the platform portion 32A.

[119] The cutting element 14A may be provided in the form of a piece of material 60A and may be subjected to a cutting S36A to remove the cutting element 14A from the material surrounding it. The cutting S36A may be carried out, for example, after the installation of S34A.

[120] When providing S10A of the first blade, the step of removing material from the platform portion 32A of the holder 30A after bending S18A may be omitted. When providing S10A of the first blade, the step of removing material from the support portion 40A of the holder 30A after bending S18A may be further omitted, or even the step of removing material from the holder 30A after bending S18A may be omitted. Eliminating the removal of material can reduce the use of raw materials during manufacturing and possibly also the generation of waste during manufacturing.

[121] As a non-limiting example, providing S10B of the second blade may be accomplished in the same manner as providing S10A of the first blade.

[122] The assembly S40 of the first and second blades together may be accomplished by installing a protective housing and mounting both the first blade 12A and the second blade 12B in the protective housing. As a non-limiting example, the first blade 12A and the second blade 12B may be subjected to stacking S42 to obtain a stack of blades, which are then mounted S44 in the protective housing substantially simultaneously. Alternatively, two immediately adjacent blades may be mounted sequentially. For example, the first blade 12A may be mounted S44A in the protective housing after the second blade has been mounted in the protective device S44B.

[123] It is also contemplated that the S50 rinseability measurement of the shaving head is measured. As a non-limiting example, the S50 rinseability measurement may be performed during the manufacture of the S100.

[124] FIG. 7A is a flow chart of an exemplary process for measuring the S50 rinsability of a shaving head.

[125] Measuring S50 the rinsability of the shaving head includes installing S52 the shaving head downstream of the liquid dispensing device and upstream of the first flow path and the second flow path, which is separated from the first flow path, so that the liquid dispensed from the liquid dispensing device is delivered to the shaving head, wherein the liquid passing through the shaving head is directed along the first flow path, and the liquid bypassing the shaving head is directed along the second flow path. In this way, the liquid passing through the shaving head can be separated from the liquid bypassing the shaving head. Since the fluid passing through the shaving head is considered to contribute more significantly than the fluid bypassing the shaving head to displacing debris that may accumulate in the shaving head, separating them allows for a quantitative determination of the proportion of the fluid used during rinsing that is capable of producing a debris displacing effect.

[126] The process S50 includes dispensing S56 liquid from a liquid dispensing device and measuring S60 the amount of liquid directed along the first flow path and/or the amount of liquid directed along the second flow path. In this way, it can be determined what amount of liquid dispensed will and/or will not contribute to displacing debris.

[127] As a non-limiting example, process S50 may include collecting S58A of liquid directed along a first flow path and/or collecting S58B of liquid directed along a second flow path. Collecting liquid directed along a given flow path may provide the ability to measure the amount of liquid after dispensing has ceased.

[128] The process S50 may include placing S54 a spacer between the shaving head and the boundary of the first flow path. The placement S54 of the spacer may be performed before dispensing S56 liquid. The spacer may help prevent leakage between the shaving head and the boundary of the first flow path.

[129] The liquid may be dispensed from the liquid dispensing device in a known quantity. Providing a known quantity of liquid may allow for the study and comparison of different rinsing methods. As a result, it may be determined whether a user of a given shaving head can achieve improved rinsing by using a particular rinsing method.

[130] A known quantity may be delivered according to a predetermined flow profile, which may be constant or may be time-dependent. The predetermined flow profile may serve as a standardized representation of the rinsing behavior. The standardized representation of the rinsing behavior may allow for direct comparison of the rinsing behavior of shaving heads.

[131] FIG. 7B schematically shows a device 80 for measuring the rinsability of a shaving head 9. The device 80 includes a liquid dispensing device 81, a first flow path 84A and a second flow path 84B that is separated from the first flow path 84A.

[132] The liquid dispensing device 81 may be provided in the form of a reservoir of a known geometric shape. For example, the reservoir may have a substantially cylindrical shape with its axis oriented substantially vertically and with a known diameter. A dispensing opening 82, from which the liquid 88 dispensed by the liquid dispensing device 81 is directed to the shaving head 9, may be provided in the lower axial surface 83 of the reservoir. The reservoir may be configured to dispense a known amount of liquid, such as two liters of water. Other amounts and/or types of liquid are also contemplated.

[133] Alternatively, the liquid dispensing device 81 may be configured to provide a constant flow of water, for example, the liquid dispensing device 81 may be configured to dispense 92 ml (milliliters) of water (or other liquid) per second for five seconds. Other flow rates and/or periods are also contemplated.

[134] The inlet 85A of the first flow path 84A may be positioned coaxially with the dispensing path through which the liquid 88 from the liquid dispensing device 81 exits the dispensing opening 82. The inlet 85B of the second flow path 84B may be configured to surround (or even coaxially with) the inlet 85A of the first flow path 84A.

[135] The holder 89 is located at the inlet 85A into the first flow path 84A. The holder 89 is configured to hold the shaving head 9 so that the shaving head 9 is located between the dispensing opening 82 and the inlets 85A, 85B into the first flow path 84A and the second flow path 84B.

[136] The holder 89 has an opening 90 and a flange 91. The flange 91 extends from the opening 90 to the boundaries 86A of the first flow path 84A. The liquid 88 dispensed by the liquid dispensing device 81 can enter the first flow path 84A by passing through the opening 90 and can enter the second flow path 84B bypassing the holder 89. The flange 91 can even be sealed at the boundaries 86A of the first flow path 84A.

[137] The holder 89 is designed to hold the shaving head 9 in such a way that the blades of the shaving head 9 are located between the opening 90 and the dispensing opening 82. In this way, the liquid 88A, which crosses the blades of the shaving head 9, can normally pass into the first flow channel 84A through the opening 90.

[138] The dispensing opening 82 may be oriented such that the dispensing path is oriented vertically downward. The entrances 85A, 85B into the first flow path 84A and the second flow path 84B may be located vertically below the dispensing opening 82. For example, when the shaving head 9 is attached to the holder 89, the dispensing opening 82 may be located approximately 15 cm (centimeters) vertically above the shaving head 9. Other distances are also possible.

[139] The first flow path 84A ends in a measuring vessel 87A, which serves to collect and measure the amount of liquid 88A directed along the first flow path 84A. This measurement may serve as an indicator of the amount of liquid 88 supplied, which may help remove debris from the shaving head 9. For example, the measuring vessel 87A may be the entire first flow path 84A.

[140] When it is required to measure the amount of liquid 88A, 88B directed along both the first flow path 84A and the second flow path 84B, the second flow path 84B may end in a second measuring vessel 87B. It is contemplated that the measuring vessel 87A in which the first flow path 84A ends may be located inside the measuring vessel 87B in which the second flow path 84B ends.

[141] FIG. 8 shows a detailed view of the device shown in FIG. 7B, when viewed along the dispensing path towards the holder 89. The gasket 92 is located between the holder 89 and the protective housing 10 of the shaving head 9, so that the opening 90 is sealed, except for the space between the blades 12A, 12B of the shaving head 9. In this way, liquid that bypasses the shaving head 9 (instead of flowing through the shaving head 9) can be prevented from entering the first flow channel 84A, and instead it can be directed along the second flow path 84B, for example, into the second measuring vessel 87B.

[142] The liquid may be dispensed from a liquid dispensing device and supplied only to a portion of the shaving head 9. For example, the liquid to be dispensed may be provided in the form of a stream that has a substantially circular cross-section (when viewed perpendicular to the dispensing path) with a diameter in the range of approximately 5 cm (centimeters) to 2 cm. Such a stream may represent a stream of water from a conventional faucet in a bathroom. Aeration of the liquid to be dispensed is also provided. For example, the liquid to be dispensed may be delivered to an impact area 93 that has a substantially circular shape when viewed along the dispensing path. The impact area 93 may be located, for example, at a midpoint between the midpoints of immediately adjacent cutting edges 18A, 18B of the shaving head 9.

[143] FIG. 9 is a schematic representation of the arrangement 111 of reference blades shown in FIG. 1A during rinsing, and FIG. 10 is a schematic representation of the arrangement 11 of blades shown in FIG. 2A during rinsing. For ease of comparison, the shaving heads of the arrangement 111 of 11 blades shown in FIGS. 9-10 have the same guard housings, and each of these shaving heads was supplied with 460 ml of water at a flow rate of 92 ml/s (milliliters per second) for 5 seconds under the same flow geometry, and each shaving head was tested five times. Comparison of FIGS. 9-10 shows that, although the two shaving heads were comparable in terms of their ability to pass water between the cutting edges 118A, 18A, 118B, 18B of their respective first blades 112A, 12A and second blades 112B, 12B, due to their identical inter-blade gaps 702, 602 (1.3 mm), through the reference shaving head, the arrangement 111 of the blades of which is shown in FIG. 9, significantly less water can pass than through the example shaving head, the arrangement 11 of the blades of which is shown in FIG. 10, due to the difference in the inter-blade gaps 704, 604 of the two shaving heads.

[144] On average, 149 ml of flow was observed through the reference shaving head, which has a 704 blade gap of 0.29 mm, while 212 ml of flow was observed through the example shaving head, which has a 604 blade gap of 0.42 mm. As a result, the tests confirm the understanding that a larger blade gap corresponds to increased rinsing.

[145] FIG. 11 shows an exemplary razor 6 including an exemplary shaving head 9. As a non-limiting example, the exemplary shaving head 9 of the exemplary razor may be a shaving head whose blade arrangement is shown, for example, in FIG. 2A. A first blade 12A and a second blade 12B are retained within a protective housing 10 of the shaving head 9.

[146] The shaving head 9 of the razor is attached to the handling section 8 of the razor 6, in this case to the handle. The shaving head 9 and the handling section 8 can be attached to each other in a detachable manner or permanently attached to each other.

[147] The razor 6 may include one or more vibrators 7. As a non-limiting example, one or more vibrators 7 may be provided in the razor head 9 and/or in the manipulation portion 8. The one or more vibrators 7 may provide vibration transmission to the skin via the razor head 9, such as via the blades 12A, 12B of the razor head 9.

[148] Although the embodiments described have been provided as different exemplary embodiments, it is intended that these embodiments are compatible, or, if they do not contradict each other, the features listed in the embodiments described may be interchangeable. Moreover, the features listed in the embodiments described are not inseparably related to each other unless such a relationship between two specified features is clearly indicated.

[149] Throughout the specification, including the claims, the term "comprising" is to be understood as synonymous with the term "comprising at least one," unless otherwise indicated. Furthermore, any range recited herein, including the claims, is to be understood as including its end value(s), unless otherwise indicated. It is to be understood that specific values for the elements described are within accepted manufacturing or industrial tolerances known to those skilled in the art, and any use of the terms "substantially" and/or "approximately" and/or "generally" is to be understood as meaning falling within such accepted tolerances.

[150] Although the present disclosure has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present disclosure.

[151] It is intended that the description and examples be regarded as illustrative only and that the true scope of protection of the invention be indicated in the following claims.

Claims (15)

1. A shaving head (9) comprising a protective housing (10), a first blade (12A) and a second blade (12B), wherein the first blade comprises a first cutting element (14A) and a holder (30A), the first cutting element comprises a section (16A) with a cutting edge and a mounting section (20A), the section with a cutting edge is a cutting edge (18A), wherein the mounting section extends from the section with the cutting edge in a direction opposite to the cutting edge, the mounting section is mounted on the holder, the second blade comprises a second cutting element (14B) having a cutting edge (18B), wherein the first and second blades are located directly next to each other so that the cutting edges (18A, 18B) of the first and second cutting elements are parallel to each other and are located to ensure the possibility of contact with the skin simultaneously during shaving, and in such a way that the inter-blade gap (604), which is the minimum distance between immediately adjacent blades, between the first blade (12A) and the second blade (12B) is in the range of 0.25 mm to 0.55 mm, and such that the inter-blade gap (602), which is the distance between two immediately adjacent cutting edges, between the first and second cutting elements is in the range of 0.90 mm to 1.60 mm. 2. The razor head (9) according to claim 1, in which the cantilever length (612A) of the first blade (12A) is in the range from 0.5 mm to 1 mm or from 0.55 mm to 0.88 mm, wherein the cantilever length (612A) is the minimum distance from the cutting edge of the section with the cutting edge of the cutting element of the blade or its orthogonal projection 412A on the mating surface 410A, when the cutting edge does not coincide with the mounting surface 22A, to the section of the mounting surface 22A that is in contact with the holder 30A. 3. The razor head (9) according to claim 1, in which the cantilever length (612A) of the first blade (12A) is in the range from 0.55 mm to 1 mm or from 0.55 mm to 0.88 mm, wherein the cantilever length (612A) is the minimum distance from the cutting edge of the section with the cutting edge of the cutting element of the blade or its orthogonal projection 412A on the mating surface 410A, when the cutting edge does not coincide with the mounting surface 22A, to the section of the mounting surface 22A that is in contact with the holder 30A. 4. The shaving head (9) according to any one of claims 1 to 3, in which the holder (30A) includes a platform portion (32A) on which the mounting portion (20A) is mounted, so that the platform portion extends along the mounting portion, and the support portion (40A) extends obliquely or perpendicularly from the platform portion for holding the first blade (12A) in the protective housing (10), wherein the support portion has a thickness (626A) in the range from 0.1 mm to 0.3 mm when measured perpendicularly to the inner surface (42A) of the support portion. 5. A shaving head (9) according to any one of paragraphs. 1-4, in which the holder (30A) includes a platform portion (32A) on which the mounting portion (20A) is mounted, so that the platform portion extends along the mounting portion, and the support portion (40A) extends obliquely or perpendicularly from the platform portion for assembling the first blade (12A) in the protective housing (10), wherein the platform portion has a length (620A, 620A') in the range of from 0.5 mm to 0.9 mm, wherein the length of the platform portion is measured along the mounting portion (20A) perpendicular to the cutting edge (18A) of the portion with the cutting edge from the inner vertex (430A) formed by the surfaces (32A, 42A) of the platform portion (32A) and the support portion (40A) facing each other, in the direction of the cutting edge (18A) of the portion (16A) with the cutting edge. 6. A shaving head (9) according to any one of paragraphs. 1-5, in which the holder (30A) includes a platform portion (32A) on which the mounting portion (20A) is mounted, so that the platform portion extends along the mounting portion, and the support portion (40A) extends obliquely or perpendicularly from the platform portion for assembling the first blade (12A) with the second blade (12B), wherein the ratio of the length (620A, 620A') of the platform portion to the length (621A, 621A') of the first blade is in the range of from 0.33 to 0.64, wherein the length of the platform portion is measured along the mounting portion from the inner vertex (430A) formed by the surfaces (34A, 42A) of the platform portion (32A) and the support portion (40A) facing each other, in the direction of the cutting edge of the portion (16A) with the cutting edge, and the length The blade is measured along the mounting section from the inner tip to the cutting edge (18A). 7. The razor head (9) according to any one of claims 1 to 6, wherein the holder (30A) includes a platform portion (32A) on which the mounting portion (20A) is mounted, so that the platform portion extends along the mounting portion, and the support portion (40A) extends obliquely or perpendicularly from the platform portion for assembling the first blade (12A) with the second blade (12B), wherein the outer surface (44A) of the support portion faces away from the platform portion, wherein the width (644A) of the first blade is in the range from 0.9 mm to 1.70 mm, wherein the width of the first blade is measured from the outer surface of the support portion to the cutting edge (18A) of the portion (16A) with the cutting edge in the direction normal to the outer surface of the support portion. 8. The razor head (9) according to claim 7, wherein the length (690) of the overlap between the first (12A) and second (12B) blades is in the range from 0 mm to 0.55 mm. 9. A shaving head (9) according to any one of claims 1 to 8, in which the first blade (12A) and the second blade (12B) are located directly next to each other in such a way that the holder (30A) of the first blade (12A) is located between the first cutting element (14A) and the second blade (12B), or in such a way that the first cutting element (14A) is located between the holder (30A) of the first blade (12A) and the second blade (12B). 10. The shaving head (9) according to claim 9, in which the first cutting element (14A) is located on the surface of the holder (30A) of the first blade (12A), which faces the skin during shaving. 11. The shaving head (9) according to claim 9, in which the first cutting element (14A) is located on the surface of the holder (30A) of the first blade (12A), which faces away from the skin during shaving. 12. A razor (6) comprising a razor head (9) according to any one of claims 1-11. 13. A razor (6) according to item 12, characterized in that it is equipped with a vibrator (7). 14. A method (S100) for manufacturing a shaving head (9) according to any one of claims 1-11, comprising providing (S10A) a first blade (12A), providing (S10B) a second blade (12B), and mounting the first (12A) and second (12B) blades in a protective housing of the shaving head. 15. The method (S100) according to claim 14, characterized in that providing (S10A) the first blade (12A) includes providing (S19A) the first cutting element (14A) and providing (S12A) a holder (30A), and providing the holder includes providing (S12A) a flat element (52A) and bending (S18A) the flat element to obtain a holder, wherein the holder includes a support portion (40A) for assembling the first blade with the second blade (12B) and a platform portion (32A) configured to mount the first cutting element (14A) thereon and extending obliquely or perpendicularly from the support portion, and, if necessary, further comprises a step (S50) of measuring the rinsability of the shaving head by measuring the amount of liquid that passes through the shaving head with the displacement of debris.