Electric razor for body grooming

Abstract

A rotatable modular razor head for an electric razor is provided. The rotatable modular razor head comprises a plurality of modular razor blade assemblies, each modular razor blade assembly comprising a razor blade having a cutting edge; and a holding unit. The razor blade assemblies are attachable to the holding unit and the holding unit is configured to be rotatably attached to a body of the electric razor. An electric razor comprising the rotatable razor head attached to a razor body is also provided.

Description

[0001] ELECTRIC RAZOR FOR BODY GROOMING

[0002] TECHNICAL FIELD

[0003] The present invention generally relates to electric razors, and in particular to electric razors for shaving of body and / or pubic hair and razor heads for such electric razors.

[0004] BACKGROUND

[0005] There is a vast range of razors for shaving, but these can broadly be classified into manual razors or electric razors. Manual razors employ a razor blade or a razor cartridge comprising multiple razor blades fixed or pivotally attached to a handle. The shaving action is achieved by the user manipulating the razor so as to move the razor blade or razor cartridge across the skin. The razor blade(s) thereby come(s) into contact with the skin and cut(s) the hair.

[0006] Electric razors, on the other hand, employ a motor to generate a relatively high-speed reciprocating or rotating cutting motion. For instance, electric razors employing a high-speed rotating roller comprising razor blades are disclosed in U.S. Patent Nos. 6,055,731 and 6,442,840 and U.S. Patent Publication No.

[0007] 2006 / 0218793. The rotation of the roller with the razor blades cuts the hair vertically similar to a guillotine. However, these electric roller-based razors are designed for shaving facial hair and not for shaving body hair. In particular, these electric razors have difficult in cutting long and / or curly body hair and may further cause nicks and cuts when used for body grooming.

[0008] There is therefore a need for electric razors that are suitable for body grooming, including shaving body and / or pubic hairs.

[0009] SUMMARY

[0010] It is a general objective to provide razor heads and electric razors adapted for shaving body and / or pubic hairs.

[0011] This and other objectives are met by the invention as defined herein.

[0012] A first aspect of the invention relates to a rotatable modular razor head for an electric razor, comprising a plurality of modular razor blade assemblies. Each modular razor blade assembly comprises a razor blade, the razor blade having a cutting edge; and a holding unit. The razor blade assemblies are attachable to the holding unit and the holding unit is configured to be rotatably attached to a body of the electric razor.

[0013] Another aspect of the invention relates to a rotatable razor head for an electric razor. The rotatable razor head comprises a first razor blade assembly comprising a razor blade having a cutting edge, and a second razor blade assembly comprising a razor blade having a cutting edge. The rotatable razor head also comprises a holding unit configured to be attachable to a body of the electric razor. The first and second razor blade assemblies are attached to the holding unit. The razor head is configured to be rotated in a first rotational direction and a second, substantially opposite, rotational direction. The cutting edge of the razor blade of the first razor blade assembly is arranged to cut in the first rotational direction, and the cutting edge of the razor blade of the second razor blade assembly is arranged to cut in the second rotational direction.

[0014] Yet another aspect of the invention relates to an electric razor comprising a razor head as disclosed herein, such as that described above, and a razor body. The razor body comprises an electric motor and a motion transfer element that is connected to the electric motor and arranged to transfer rotational motion generated by the electric motor. The razor body also comprises an attachment mechanism configured for receiving the razor head for attachment to the razor body and a release mechanism configured to release the razor head from the razor body, when mounted on the razor body. The razor body may further comprise an actuator. In such examples, the actuator may be configured to control the rotational direction of the motion transfer element such that the razor head, when mounted on the razor body, selectively rotates in the first rotational direction or the second rotational direction, thereby enabling a selective cutting by the cutting edge of the first razor blade assembly and the cutting edge of the second razor blade assembly.

[0015] The invention relates to an electric razor and a rotatable razor head, comprising at least two razor blade assemblies. The rotatable razor head and the electric razor achieve an ergonomic and comfortable shaving by providing a dual rotation of the razor head as the razor head is rotated by the electric razor. The dual rotation provides a close shaving, allowing the user to easily shift between a first and a second rotational direction. Due to the ability to easily shift rotational direction, improved precision is achieved, since the user is able to readily shift direction to cut against the growth of the hair.

[0016] Yet another aspect of the invention relates to a method for assembling and manufacturing a razor head as disclosed herein. The method comprises providing a plurality of modular razor blade assemblies, such as any modular razor blade assembly described herein. The method further comprises mounting the modular razor blade assemblies to a holding unit, such as any holding unit described herein. The method further comprises securing the modular razor blade assemblies and holding unit together, such that they may not be readily separated

[0017] Yet another aspect of the invention relates to another method for assembling a razor head. The method comprises providing a plurality of razor head assemblies having a first end and a second, opposite, end and comprising a razor blade having a cutting edge. The method also comprises providing a holding unit comprising a first holding part and a second holding part. The method further comprises attaching the first end of a first razor blade assembly of the plurality of razor blade assemblies to the first holding part of the holding unit and attaching the second end of the first razor blade assembly to the second holding part of the holding unit and attaching the second end of a second razor blade assembly of the plurality of razor blade assemblies to the first holding part of the holding unit and attaching the first end of the second razor blade assembly to the second holding part of the holding unit.

[0018] Advantageously, the first end of the first razor blade assembly is attached to the first holding part of the holding unit through snap-action interaction between the first holding part of the holding unit and the first end of the first razor blade assembly; and the second end of the first razor blade assembly is attached to the second holding part of the holding unit through snap-action interaction between the second part of the holding unit and the second end of the first razor blade assembly. Correspondingly, the second end of the second razor blade assembly is attached to the first holding part of the holding unit through snapaction interaction between the first holding part of the holding unit and the second end of the second razor blade assembly; and the first end of the second razor blade assembly is attached to the second holding part of the holding unit through snap-action interaction between the second holding part of the holding unit and the first end of the second razor blade assembly

[0019] Yet another aspect of the invention relates to a kit of parts comprising a razor body as disclosed herein and a plurality of conical or frustoconical razor heads as disclosed herein, wherein the slant of a first conical or frustoconical razor head is different from the slant of a second conical or frustoconical razor head of the plurality of razor heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments, together with further objects and advantages thereof, may best be understood by making reference to the following description taken together with the accompanying drawings, in which:

[0021] Figs. 1A-C illustrate a rotatable razor head according to some embodiments in various views;

[0022] Figs. 2A-B illustrate a rotatable razor head according to some embodiments in various views;

[0023] Figs. 3A-E illustrate a rotatable razor head according to some embodiments in various views;

[0024] Figs. 4A-F illustrate a razor blade assembly according to some embodiments in various views;

[0025] Fig. 5 illustrates a razor blade assembly according to some embodiments in an exploded view;

[0026] Figs. 6A-C illustrate a razor blade assembly according to some embodiments in various views;

[0027] Figs. 7A-E illustrate a rotatable razor head according to some embodiments in various views;

[0028] Figs. 8A-E illustrate a rotatable razor head according to some embodiments in various views;

[0029] Figs. 9A-C illustrate a razor blade assembly according to some embodiments in various views;

[0030] Fig. 10A illustrates a razor body according to some embodiments in various views;

[0031] Figs. 10B-C illustrate a razor body according to some embodiments in various views;

[0032] Figs. 11 A-E illustrate a razor body according to some embodiments in various views; and

[0033] Figs. 12A-D illustrate an electric razor according to some embodiments in various views.

[0034] DETAILED DESCRIPTION

[0035] The present invention generally relates to electric razors, and in particular to electric razors for shaving of body and / or pubic hair and razor heads for such electric razors.

[0036] Body grooming is common among men and women to remove body and / or pubic hair. Body trimmers are commonly used to remove body and / or pubic hair but these devices generally suffer from the risk of lacerations, nicks and cuts, have difficulties cutting long and / or curly hair and do not provide a close shave. Moreover, body trimmers are not ergonomical and can cause cramping when a user attempts to change the direction of cut. Figs. 1A-C illustrate a rotatable modular razor head 10 according to some embodiments in various views. Figs. 1A-C show the razor head 10 for an electric razor 1 comprising a plurality of modular razor blade assemblies 100. Each modular razor blade assembly 101,102,103,104 of the plurality of modular razor blade assemblies 100 comprises a razor blade 150 having a cutting edge 151. Each modular razor blade assembly 101,102,103,104 also comprises a holding unit 400. The razor blade assemblies 101, 102, 103, 104 are attachable to the holding unit 400 and the holding unit 400 is configured to be rotatably attached to a body 20 of the electric razor 1 (not shown). The modular razor blade assemblies 100, 101, 102, 103, 104 may also be referred to as razor blade modules 100, 101, 102, 103, 104.

[0037] The razor blades 150 may be flat razor blades or welded razor blades, formed from bent sheet metal.

[0038] In the illustrated example, each razor blade assembly 101,102,103,104 comprises a plurality of lateral ribs 110. The lateral ribs 110 may also be described as circumferential ribs. The lateral ribs extend in a circumferential direction on an outer side of the razor blade assembly 101,102,103,104. Each razor blade assembly 101,102,103,104 may comprise any suitable number of ribs. In the illustrated example, the razor blade assemblies 101,102,103,104 each comprise five lateral ribs 110.

[0039] The ribs 110 may essentially cover the razor blade 150, such that the blade 150 is arranged under the ribs 110. Thereby, when in use, the ribs will contact the skin and provide protection from cutting.

[0040] The holding unit 400 comprises a first holding part 410 and a second holding part 420. The holding unit 400 is configured to hold the plurality of razor blade assemblies 100 in place in the razor head 10.

[0041] Advantageously, the razor blade assemblies 101 ,102,103,104 are symmetrical and / or essentially identical.

[0042] In use, the rotatable razor head 10 is removable from the body 20 of the electric razor 1 (not shown).

[0043] The illustrated modular razor head 10 is substantially cylindrical. Other shapes may also be envisioned, such as conical or frustoconical, or a combination of cylindrical, conical and / or frustoconical.

[0044] Figs. 2A-B illustrate a modular razor head 10 according to some embodiments in various views. In Fig.

[0045] 2A, the razor head 10 is shown in three views, where the razor head 10 has been rotated in each view, in relation to the others. The razor blade assemblies 101,102,103,104 are individually arrangeable in the modular razor head 10 to cut in a first rotational direction CW or in a second, opposite, rotational direction CCW. Thus, each razor blade assembly 101 ,102,103,104 may be described as ''bi-directional". In other words, each razor blade assembly 101,102,103,104 can be arranged in the razor head 10 so that it either cuts clockwise or counterclockwise. Such examples are even more advantageous when the razor blade assemblies 101 ,102,103,104 are essentially symmetrical. The rotatable modular razor head 10 may thus be configured such that the cutting edge 151 of the razor blade 150 of each razor blade assembly 101,102,103,104 is arrangeable to cut in a first rotational direction CW and arrangeable to cut in a second, substantially opposite, rotational direction CCW.

[0046] In an assembled state of the modular razor head 10, the ribs 110 of at least two adjacent razor blade assemblies 101, 102, 103, 104 are offset in relation to each other. When used herein, the word "offset” is intended to describe that the ribs 110 of one razor blade assembly are not aligned with the ribs 110 of at least one other razor blade assembly 100 arranged in the razor head 10. Thereby, no areas of the skin are missed due to the ribs 110 or other skin guards lying against the skin during shaving. In Fig. 1 A, for example, it is shown that the ribs 110 of the first assembly 101 are offset with respect to the ribs 110 of the second assembly 102.

[0047] The holding unit 400 is configured to allow the at least two adjacent razor blade assemblies 101 , 102, 103, 104 to be installed such that the ribs 110 of the at least two adjacent razor blade assemblies 101 , 102, 103, 104 are arranged offset in relation to each other. Such a configuration may, for example, be achieved by arranging one or more raised portions 440 at, in, or on, the first holding part 410 and / or the second holding part 420.

[0048] The ribs 110 protect the razor blade 150 from overexposure, thereby preventing damage to the razor blade 150. In addition, a configuration using the ribs 110 provides a high accuracy of the distance between the cutting edge 151 of the razor blade 150 and the ribs 110. Thereby, tolerance issues in assembly are avoided, since the ribs 110 and razor blade 150 may be one structural piece without any connection between them.

[0049] The holding unit 400 is configured to be attachable to the razor body 20 of the electric razor 1 such that, when attached, a longitudinal axis 10a of the razor head 10 is substantially parallel with a longitudinal axis 20a of the razor body 20 of the electric razor 1 (see Fig. 10A). The second holding part 420 may comprise a cap protrusion 460, which, in an assembled state of the razor head 10, may extend toward the first holding part 410. The cap protrusion 460 may be hollow and may be configured to receive a connecting mechanism, such as a rod, of a razor handle 20 (see Fig.

[0050] 10A).

[0051] Figs. 3A-E illustrate the razor head 10 according to some embodiments in various views.

[0052] The holding unit 400 comprises a first holding part 410 and a second holding part 420 The first holding part 410 may be referred to as a base, and the second holding part 420 may be referred to as a cap. In an assembled state of the modular razor head 10, each modular razor blade assembly 101, 102, 103, 104 is arranged between the first holding part 410 and the second holding part 420, such that a first longitudinal end 101a, 102a, 103a, 104a of at least one modular razor blade assembly 101, 102, 103, 104 is attached to the first holding part 410 and a second, substantially opposite, longitudinal end 101b, 102b, 103b, 104b of the at least one modular razor blade assembly 101, 102, 103, 104 is attached to the second holding part 420. In other words, one longitudinal end of a razor blade assembly 100 is attached to the base of the holding unit 400, while an opposite longitudinal end is attached to the cap of the holding unit 400.

[0053] Connection mechanisms of any suitable kind are suitably arranged at the longitudinal ends of the razor blade assemblies 101, 102, 103, 104. In the illustrated example, a first connection peg 116 is arranged at the first longitudinal end 101a, 102a, 103a, 104a, and a second connection peg 117 is arranged at the second longitudinal end 101b, 102b, 103b, 104b. In other words, the razor blade assemblies 101, 102, 103, 104 may be equipped with connection mechanisms at the longitudinal ends thereof, such as connection pegs 116, 117. The connection pegs 116, 117 may also be referred to as pins. The connection pegs 116, 117 are advantageously symmetrical, such that the whole razor blade assembly 101, 102, 103, 104 may also be symmetrical. Thereby, each razor blade assembly 101 , 102, 103, 104 may be readily placed with either of the connection pegs 116, 117 connected to the first holding part 410 or the second holding part 420. Thus, the razor blade assemblies 101 , 102, 103, 104 can be arranged in the razor head 10 to cut in different directions.

[0054] The first holding part 410 and / or the second holding part 420 may comprise one or more raised portions 440. In the illustrated example, both the first holding part 410 and the second holding part 420 comprise a raised portion 440. In some embodiments, and in an assembled state of the modular razor head 10, a first modular razor blade assembly 101, 102, 103, 104 may be attached to the base 410 of the holding unit 400 at the first longitudinal end 101a, 102a, 103a, 104a and attached to the second holding part 320, 420 of the holding unit 300, 400 at the second longitudinal end 101b, 102b, 103b, 104b; while a second modular razor blade assembly 101 , 102, 103, 104 is attached to the second holding part 420 of the holding unit 400 at the first longitudinal end 101a, 102a, 103a, 104a and attached to the first holding part 410 of the holding unit 400 at the second longitudinal end 101b, 102b, 103b, 104b.

[0055] The first holding part 410 of the holding unit 400 and / or the second holding part 420 of the holding unit 400 may comprise a plurality of apertures 470. Alternatively or additionally, first holding part 410 of the holding unit 400 and / or the second holding part 420 of the holding unit 400 may comprise grooves 471. The apertures 470 and grooves 471 are configured to interlock with the longitudinal ends 101a, 102a, 103a, 104a, 101b, 102b, 103b, 104b of the razor blade assemblies 101 , 102, 103, 104 in a form-locking relationship. In other words, the pegs 116 and 117 are suitably configured to be inserted into the apertures 470 and grooves 471 and thereby arranged in place in the razor head 10.

[0056] As shown in the illustrated example, the holding unit 400 advantageously comprises a stem 430 configured to transfer rotational motion from the electric razor 1 (not shown) to the rotatable razor head 10. The stem 430 may be attached to the first holding part 410, i.e., the base, of the holding unit 400. The stem 430 may be attached to the first holding part 410 using any suitable method. In some examples the stem 430 may be detachable from the first holding part 410. In other examples, such as that shown in Figs. 3A-E, the stem 430 may be integrated with the first holding part 410. In some examples, the cap protrusion 460 of the second holding part 420 may be configured to receive the stem 430.

[0057] A magnet 421 may be arranged at a suitable position in a region opposite where the razor handle 20 (not shown) is to be connected. The magnet 421 may be arranged on / at a distal end of the stem 430, or in the second holding part 420, i.e., the cap. The magnet 421 may serve to keep the razor head 10 in place when mounted on the razor handle 20 (see, e.g., Fig. 10A), which in such examples should suitably comprise a connection mechanism that adheres to the magnet 421. Such a connection mechanism may, for example, be a rod of a suitable size which can extend through an inside space 432 of the stem 430 and be attracted to the magnet 421 . In some examples, the cap protrusion 460 of the second holding part 420 may be configured to house the magnet 421. To alert the user to the razor head 10 having been securely fastened to the razor handle 20, an audible indication, such as a click sound, may be given when the razor handle 20 attaches to the magnet 421. Alternatively, a snap-action mechanism may be used to connect the razor head 10 to the razor handle 20, or any other suitable mechanism.

[0058] As shown in the illustrated example, the stem 430 may comprise one or more tips 431 . The tips 431 are suitably shaped to fit into mating apertures 421 , or grooves, arranged in the second holding part 420, i.e., the cap. In examples where the tips 431 are arranged to extend through the complementarily shaped apertures 421 in the second holding part 420, the tips 431 may be used during manufacturing of the razor head 10. Using any suitable method, such as a heat press, the protruding tips 431 may be melted, and thereby firmly attach the components of the razor head 10 together.

[0059] Fig. 30 also illustrates how the ribs 110 of one razor blade assembly 101 , 102, 103, 104 may be arranged offset from the ribs 110 of an adjacent razor blade assembly 101 , 102, 103, 104.

[0060] Figs. 4A-F illustrate a razor blade assembly 100 according to some embodiments in various views. The razor blade assembly 100 may correspond to either or all of the razor blade assemblies 101, 102, 103, 104 shown in Figs. 1-3.

[0061] The illustrated razor blade assembly 100 comprises an outer piece 113 and an inner piece 114. A razor blade 150 is interposed between the outer piece 113 and the inner piece 114. The outer piece 113 and the inner piece 114 may be connected using any suitable means and methods. In the illustrated embodiment, protruding pegs 113b are used for attaching the outer piece 113 to the inner piece. Any suitable number of pegs 113b ay be used.

[0062] A dent 115 is arranged in the inner piece 114, such that the razor blade 150 may rest in a position where the edge 151 is arranged freely (see Fig. 4C). In other words, the edge 151 sticks out from the inner piece 114 and extends over an open space. The razor edge 151 may be said to be arranged in a cantilevered position. The space created by arranging the dent 115 on the inner piece 114 prevents hair from getting stuck between the razor blade and the inner piece 114. Thereby, clogging is prevented. Moreover, cleaning and maintenance of the razor blade assembly is facilitated.

[0063] During manufacturing, the razor blade 150 may be arranged in the U-shaped, or tub-shaped, center 113a of the outer piece 113, and the inner piece 114 may be arranged on top of the razor blade 150, such that the pegs 113b (or any other suitable fasteners) may extend through the razor blade 150 and connect with the inner piece 114. Thereby, the razor blade 150 rests steadily during manufacturing. Any suitable manufacturing steps may be taken, using any suitable machinery. When using a heat press, for example, the configuration shown in Figs. 4A-F is particularly beneficial, since it allows the outer piece 113 to be arranged steadily in a suitable machine, and thereafter to insert the razor blade 150 into the center 113a of the outer piece 113, such that the razor blade 150 remains stable and securely positioned within the machine until the inner piece 114 is mounted on top of the razor blade 150.

[0064] Each razor blade assembly 101, 102, 103, 104 may comprise at least one guide comb 111 with a set of guide teeth 112 in connection with the razor blade 150. In an assembled state of the razor head 10, the guide teeth 112 of the respective guide combs 111 of at least two adjacent razor blade assemblies 101 , 102, 103, 104 are suitably offset in relation to each other. The guide teeth 112 may also be referred to as ridges, fins, or the like.

[0065] Advantageously, the holding unit 400 (see Figs. 1-3) is configured to allow the at least two adjacent razor blade assemblies 101 , 102, 103, 104 to be installed such that the guide teeth 112 of the respective guide combs 111 of the at least two adjacent razor blade assemblies 101, 102, 103, 104 are arranged offset in relation to each other. Such a configuration may, for example, be achieved by arranging one or more raised portions 440 at, in, or on, the first holding part 410 and / or the second holding part 420 (see Figs.

[0066] 1-3). When used herein, the word "offset” is intended to describe that the guide combs 111 of one razor blade assembly 100 are not aligned with the guide combs 111 of at least one other razor blade assembly 100 arranged in the razor head 10. Thereby, no areas of the skin are missed due to the guide combs 111 resting against the skin during shaving.

[0067] As can be seen in Fig. 4D, the ribs 110, which may also be referred to as guards, may suitably protrude slightly above, i.e., radially outward from, the razor blade 150 to protect the skin. The surface of the razor blade 150 and the surface of the ribs 110 is thus separated, and the radius of the blade rotation is smaller than the radius of the razor blade assembly 100 itself. Thus, the ribs 110 create a barrier between the razor blade 150 and the skin.

[0068] Fig. 5 illustrates a razor blade assembly 100 according to some embodiments in an exploded view. The illustrated razor blade assembly 100 comprises an outer piece 113 and an inner piece 114. A razor blade 150 is interposed between the outer piece 113 and the inner piece 114. The outer piece 113 and the inner piece 114 may be connected using any suitable means and methods. In the illustrated embodiment, protruding pegs 113 are used for attaching the outer piece 113 to the inner piece 114. Figs. 6A-C illustrate a razor blade assembly 100 according to some embodiments in various views. Figs.

[0069] 6A-C show a blade cover 170 comprised of a first cover part 170a and a second cover part 170b. A razor blade 150 is arranged between the two parts and kept in place by the two parts. The first cover part 170a and second cover part 170b may be connected using any suitable means and methods. In the illustrated embodiment, the first cover part 170a comprises protruding connectors 173 and the second cover part 170b comprises receiving connectors 174. To close the razor blade assembly 100, the protruding connectors 173 are inserted into the receiving connectors 174, which may be grooves or apertures, or any other suitable means.

[0070] Figs. 7A-E illustrate embodiments of the rotatable razor head 10 in various views. The rotatable razor head 10 is suitable for use in the electric razor 1 (see Figs. 12A-D). The rotatable razor head 10 comprises a plurality of, i.e., at least two, razor blade assemblies 100. The razor blade assemblies 100 may also be referred to as razor cartridges. As illustrated in Figs. 7A-E, the rotatable razor head 10 comprises a first razor blade assembly 101 comprising a razor blade 150 having a cutting edge 151 and a second razor blade assembly 102 comprising a razor blade 150 having a cutting edge 151. As in the example shown in Figs. 7A-E the razor head 10 may comprise a plurality of first razor blade assemblies 101 and a plurality of second razor blade assemblies 102. The at least one razor blade assembly 101 and the at least one second razor blade assembly 102 are collectively referred to as razor blade assemblies 100 herein. For example, the razor head 10 may comprise six razor blade assemblies 100, where three of the six razor blade assemblies 100 may be referred to as first razor blade assemblies 101 and three of the six razor blade assemblies 100 may be referred to as second razor blade assemblies 101. Alternatively, the razor blade assemblies 100 may be referred to as a first, second, third, fourth, fifth and sixth razor blade assembly. In other examples, the razor head 10 may comprise four razor blade assemblies 100, eight razor blade assemblies 100 or ten razor blade assemblies 100. In certain examples there does not need to be an even number of razor blade assemblies 100, but instead three, five, seven, nine etc. razor blade assemblies 100. In such examples, the razor head 100 may be said to have a larger number of first razor blade assemblies 101 than second razor blade assemblies 102, or vice versa.

[0071] In an example, the razor head 10 comprises 2N razor blade assemblies 100 of which N are first razor blade assemblies 101 and N are second razor blade assemblies. N is a positive integer equal to or larger than one. In an example, N is selected within an interval of from 1 to 5, preferably selected within an interval of from 2 to 4, and more preferably being 3. The N first razor blade assemblies 101 and the N second razor blade assemblies 102 are preferably alternately arranged in the razor head 10. In other words and if N is equal to or larger than two, each first razor blade assembly 101 preferably has two adjacent or neighboring second razor blade assemblies 102 when arranged in the razor head 10 and each second razor blade assembly 102 preferably has two adjacent or neighboring first razor blade assemblies 101. Thus, when traveling around the circumference of the razor head 10 the 2N razor blade assemblies 101 are arranged as first razor blade assembly 101, second razor blade assembly 102, first razor blade assembly 101, second razor blade assemble 102, etc.

[0072] As shown in Figs. 7A-E, the razor head 10 further comprises a holding unit 300 configured to be attachable to the razor body 20 of the electric razor 1. In other words, the holding unit 300 is configured to be attached to the razor body 20 when the razor head 10 is mounted to the razor body 20 of the electric razor 1 .

[0073] When the razor head 10 has been assembled and is ready for use, the first and second razor blade assemblies 100 are attached to the holding unit 300. The holding unit 300 thereby retains the first and second razor blade assemblies 100 in place in the razor head 10.

[0074] The razor head 10 is configured to be rotated in a first rotational direction CW and a second, substantially opposite, rotational direction CCW as indicated in Fig. 7B. The first rotational direction CW may also be referred to as a clockwise direction, and the second rotational direction CCW may also be referred to as a counterclockwise direction, or vice versa. The cutting edge 151 of the razor blade 150 of the first razor blade assembly 101 is arranged to cut in the first rotational direction CW, and the cutting edge 151 of the razor blade 150 of the second razor blade assembly 102 is arranged to cut in the second rotational direction CCW. In other words, the cutting edge 151, i.e., the sharp edge, of the razor blade 150 of the first blade assembly 101 is oriented so that when the razor head 10 is rotated in the first direction CW, the cutting edge 151 of the first blade assembly 101 makes contact with, and cuts, the hair. Correspondingly, the cutting edge 151, i.e., the sharp edge, of the razor blade 150 of the second blade assembly 102 is oriented so that when the razor head 10 is rotated in the second direction CCW, the cutting edge of the first blade assembly makes contact with, and cuts, the hair. The rotational direction may also be referred to as a cutting direction. The cutting edge of the first razor blade assembly 101 may be said to face the second rotational direction CCW and the cutting edge 151 of the second razor blade assembly 102 may be said to face the first rotational direction CW. In an example, the cutting edge 151 of the razor blade 150 of the first razor blade assembly 101 will, when the razor head 10 is rotating in the first direction CW, cut hair but the cutting edge 151 of the razor blade 150 of the second razor blade assembly 102 will not cut any hair when the razor head 10 is rotating in the first direction CW. Correspondingly, the cutting edge 151 of the razor blade 150 of the second razor blade assembly 102 will, when the razor head 10 is rotating in the second direction CCW, cut hair but the cutting edge 151 of the razor blade 150 of the first razor blade assembly 101 will not cut any hair when the razor head 10 is rotating in the second direction CCW

[0075] The holding unit 300 is configured to be attachable to the razor body 10 of the electric razor 1 such that, when attached, a longitudinal axis 10a of the razor head 10 is substantially parallel to a longitudinal axis 20a of the razor body 20 of the electric razor 1. Thus, when attached, the razor head 10 and the razor body 20 may be arranged along the same longitudinal axis. Alternatively, the longitudinal axis 10a of the razor head 10 may be parallel or substantially parallel to the longitudinal axis 20a of the razor body 20. In other words, the razor head 10 and razor body 20, when joined together by means of the holding unit 300, form an l-shaped electric razor 1 , in contrast to commonly used T-shaped razors.

[0076] The razor head 10 may be cylindrical. In such examples, the razor head 10 may have an essentially circular cross-section. In such examples, the diameter of cross-section of a base 120 of the razor head 10 is substantially the same as the diameter of a corresponding cross-section of a tip 130 of the razor head 10. The base 120 suitably indicates the part of the razor head 10 that is closest to the razor body 20, when attached. The tip 130 suitably indicates the part of the razor head 10 that is furthest from the razor body 20, when attached. Alternatively, the razor head 10 may be essentially conical. In such examples, the diameter of the cross-section of the tip 130 of the razor head 10 approaches zero. The tip 130 of the conically shaped razor head 10 may be rounded. In some examples, the cross-section may be elliptical.

[0077] Alternatively, as shown in the example of Figs. 7A-E, the razor head 10 may be frustoconical. As can be seen in Figs. 7A-E, the diameter DB of the cross-section of the base 120 of the razor head 10 is larger than the diameter DT of the cross-section of the tip 130 of the razor head 10, see Fig. 7B.

[0078] In examples where the razor head 10 is essentially conical or frustoconical, the slant of the sides between the base 120 and the tip 130 of the razor head 10 may be adapted to provide an optimized and ergonomical cut. Since the razor head 10 is easily removable from the razor body 20, a user may use different razor heads 10 with the same razor body 20. Thereby, a high precision shaving can be achieved in various areas of the body without the need for more than one razor body 20. For example, a plurality of users may use the same razor body 20, and each individual user may select a personal razor head 10 with a slant that is suitable for their intended use and body shape.

[0079] Similarly, when the razor head 10 is essentially conical with a rounded tip 130, the tip 130 may be held against the body for support, allowing a steady and precise shave in various areas of the body.

[0080] The razor head 10 may have any suitable length. In some examples, the length of the razor head 10, measured from the base 120 to the tip 130 of the razor head 10, may be in the range of 2 to 10 cm. In some preferred embodiments, the length of the razor head 10, measured from the base 120 to the tip 130 of the razor head 10, may be in the range of 4 to 6 cm.

[0081] The angle a of the sides in a conical or frustoconical embodiment of the razor head 10 may thus vary significantly, see Fig. 7C. In some examples, the angle of the conical or frustoconical razor head 10 may be in the range of 1 degree to 25 degrees. In some embodiments, the angle a of the conical or frustoconical razor head 10 may be in the range of 1 degree to 15 degrees, or 1 degree to 10 degrees. In some preferred embodiments, the angle a of the conical or frustoconical razor head 10 may be in the range of 2 degrees to 8 degrees; 3 degrees to 6 degrees; or 4 to 5 degrees. In some preferred embodiments, the angle a of the conical or frustoconical razor head 10 is 4 degrees. In other words, the angle a between the slant of the cone to a plane parallel to the longitudinal axis 10a of the razor head 10 may be in the range of 1 degree to 15 degrees; 1 degree to 10 degrees; 2 degrees to 8 degrees; 3 degrees to 6 degrees; or 4 to 5 degrees. In some preferred embodiments, the angle a of the slant to a plane parallel to the longitudinal axis 10a of the razor head 10 is 4 degrees.

[0082] Fig. 8A-E illustrate a rotatable razor head according to an embodiment in various views. Fig. 8A, for example, illustrates an exploded view of the rotatable razor head, according to an example embodiment. As shown in Fig. 8A-E, the holding unit 300 comprises a first holding part 310 and a second holding part 320. The first holding part 310 may also be referred to as a base part of the holding unit 300. The second holding part 320 may also be referred to as a tip part of the holding unit 300. In examples such as that shown in Fig. 8a-e, where the razor head 10 is frustoconical, the diameter of a cross-section of the first holding part 310 perpendicular to the longitudinal axis 10a of the razor head 10 is larger than the diameter of a corresponding cross-section of the second holding part 310 perpendicular to the longitudinal axis 10a of the razor head 10. As shown in Fig. 8 A, the first and second holding parts 310, 320 are arranged to lock the plurality of razor blade assemblies 100 in place between the first and second holding parts 310, 320. Thus, when assembled, the first holding part 310 becomes a base for the razor head 10 and the second holding part 320 becomes a tip of the razor head 10, with the plurality of razor blade assemblies 100 arranged therebetween.

[0083] In the example of Fig. 8A-E, each of the first holding part 310 and the second holding part 320 comprises a plurality of protrusions 330. The protrusions are configured to interlock with the razor blade assemblies 100, in a form-locking relationship where the shape of the protrusions of the respective holding part 310, 320, ensures a locking attachment with a first longitudinal end 100a or a second longitudinal end 100b of each of the plurality of razor blade assemblies 100. The first holding part 310 may comprise a plurality of protrusions 330a. The second holding part 320 may comprise a plurality of protrusions 330ba. In some examples, such as that show in Fig. 8A-E, the protrusions 330 are configured to lock to the razor blade assemblies 100 through a snap-fit, such that each razor blade assembly 100 snaps into a locked position on the first and second holding part 310, 320. The protrusions 330 may be flexible. The protrusions 330 may comprise protuberances that interlock with corresponding apertures or grooves 163 (see Fig. 9C) in the razor blade assemblies 100, thereby restricting the movement of the razor blade assemblies 100. The protuberances may be configured in any suitable shape that corresponds to a receiving aperture or groove 163 on the razor blade assemblies 100 and contributes to the locking effect when one or more of the razor blade assemblies 100 is attached to the first and / or second holding part 310, 320.

[0084] In some examples, such as that shown in Fig. 8A-E, some of the protrusions 330 are configured in a hook-shaped manner, whereby the hook portion interlocks with a corresponding groove or aperture 163 in the razor blade assembly 100. In some examples, the first and / or second holding part 310, 320, comprises a first plurality of hook-shaped protrusions 331 and a second plurality of hook-shaped protrusions 332. In such examples, the first and second hook-shaped protrusions 331, 332, may have different heights, such that they extend at different depths into the razor blade assemblies 100.

[0085] In some examples, the protrusions 331 of the first plurality of hook-shaped protrusions 331 comprise a first hook-shaped portion 331a and a second hook-shaped portion 331b. The first hook-shaped portion 331a and the second hook-shaped portion 331b are oriented in substantially opposite directions, such that the first hook-shaped portion 331 a faces radially outward, away from the central longitudinal axis 10a of the razor head 10, while the second hook-shaped portion 331b faces radially inward, toward the central longitudinal axis 10a of the razor head 10. The first plurality of hook-shaped protrusions 331 of the first holding part 310 of the holding unit 300 is advantageously configured to interlock the first holding part 310 with the razor body 20. In such examples, the first plurality of hook-shaped protrusions 331 are suitably arranged such that the second hook-shaped portion 331b protrudes into a corresponding groove or aperture in the razor body 20, such as the groove 232b arranged at the attachment mechanism 220. Thus, when mounting the razor head 10 to the razor body 20, the first holding part 310 may snap into position on the razor body 20 as the second hook-shaped portion 331b of each of the first plurality of hook-shaped protrusions 331 interlock with attachment mechanism 220 of the razor body 20.

[0086] Alternatively or additionally, the first plurality of hook-shaped protrusions 331 of the first holding part 310 of the holding unit 300 may be configured to interlock the first holding part 310 with one or more of the razor blade assemblies 100, by introducing first hook-shaped portion 331a into the aperture or groove 163 arranged in the blade support 160 of each razor blade assembly 100. In such examples, the first plurality of hook-shaped protrusions 331 is arranged to interlock the first holding part 310 with both the razor body 20 and the razor blade assemblies 100.

[0087] The hook-shaped protrusions 332 of the second plurality of hook-shaped protrusions 332 are suitably configured to interlock the first holding part 310 with one or more of the razor blade assemblies 100, and only require the first hook-shaped portion 331a. The hook-shaped protrusions 332 of the second plurality of hook-shaped protrusions 332 may thus be configured to interlock the first holding part 310 and one or more of the razor blade assemblies 100 by introducing the first hook-shaped portion 331a into the aperture or groove 163 arranged in the blade support 160 of each razor blade assembly 100.

[0088] The second holding part 320 may comprise the first plurality of hook-shaped protrusions 311 and / or the second plurality of hook-shaped protrusions 332. However, since the second holding part 320 is not necessarily configured to interlock with the razor body 20, the second holding part 320 only requires protrusions 330 comprising the first hook-shaped portion 331a, such as the second plurality of hookshaped protrusions 332. On the other hand, the second hook-shaped portions 331b of the first plurality of hook-shaped protrusions 331 may interlock with other features of the razor head 10, such as other components of the razor blade assemblies 100, and may thus be beneficially arranged in the second holding part 320 as well as the first holding part 310.

[0089] Due to the snap-fit attachment, an audible indication is obtained when each razor blade assembly 100 is connected to the first and / or second holding part 310, 320. The indication may be a click sound, informing the user that the razor blade assembly 100 has been sufficiently attached to the first and / or second holding part 310, 320.

[0090] The first and / or second holding part 310, 320, may additionally comprise pegs, studs or ridges 350, configured to be inserted into corresponding apertures (not shown) of the razor blade assemblies 100, or arranged in between the razor blade assemblies 100 when the razor head 10 is assembled. Such pegs, studs or ridges 350 are suitable configured to be rigid, in contrast to the protrusions 330 that are beneficially configured to be at least partly flexible.

[0091] In the example of Fig. 8A-E, each of the first holding part 310 and the second holding part 320 comprises a plurality of apertures 340. In such examples, the apertures 340 are arranged and configured to receive corresponding longitudinal protrusions 180 of the razor blade assemblies 100. The apertures 340 may be arranged evenly distributed around a center point of the first holding part 310 and / or the second holding part 320. Each razor blade assembly 100 may comprise a first longitudinal protrusion 180a arranged at a first longitudinal end 100a of the razor blade assembly 100 and / or a second longitudinal protrusion 180b arranged at a second longitudinal end 100b of the razor blade assembly 100. The longitudinal protrusions 180a, 180b, may also be referred to a knobs or pegs. To assemble the razor head 10, the first and / or second longitudinal protrusion 180a, 180b, of each razor blade assembly 100 is inserted into a corresponding aperture 340 of the first or second holding part 310, 320.

[0092] Figs. 9A-C illustrate a razor blade assembly according to an embodiment in various views.

[0093] As shown in the example of Figs. 9A-C, each razor blade assembly 100 may comprise a razor blade 150, a blade support 160 and a blade cover 170. The razor blade 150, blade support 160 and blade cover 170, when connected, to form the razor blade assembly 100. The razor blade 150 comprises the cutting edge 151 . As in the example shown in Figs. 9A-C, the razor blade 150 is mounted on the blade support 160 and the blade cover 170 attaches to the blade support 160, such that the razor blade 150 is securely arranged within the razor blade assembly 100, with the cutting edge 151 extending through a longitudinal aperture 172 in the blade cover 170.

[0094] In an embodiment, the razor blade 150 is attached to a blade base 190, typically in the form of a L-shaped or folded blade base 190. The razor blade 150 and the blade base 190 could be two different pieces with the razor blade 150 attached to the blade base 190, such as by welding. Alternatively, the razor blade 150 and the blade base 190 could be a unitary metal piece. In either case, the blade base 190 is arranged to support the razor blade 150 at a correct position, including blade angle and blade exposure, when the razor blade 150 and blade base 190 are arranged in the razor blade assembly 100. Hence, in a typical embodiment, the razor blade 150 is angled relative, such as orthogonal or close to orthogonal, to the blade base 190.

[0095] Advantageously, the razor blade assemblies 100 are symmetrical, so that each razor blade assembly 100 can be arranged in the razor head 10 to cut in either the first rotational direction CW or the second rotational direction CCW. In addition, having symmetrical razor blade assemblies 100 allows for either of the first longitudinal end 100a or the second longitudinal end 100b of the razor blade assembly 100 to be arranged in either the first holding part 310 or the second holding part 320. For example, when the razor blade assembly 100 comprises a first longitudinal protrusion 180a at the first longitudinal end 100a and a second longitudinal protrusion 180b at the second longitudinal end 100b, the longitudinal protrusions 180a, 180b, are suitably substantially identical and configured such that they can fit in the respective apertures 340 of the first holding part 310 and the second holding part 320. Thereby, each razor blade assembly 100 of the plurality of razor blade assemblies 100 can be arranged between the first holding part 310 and second holding part 320 of the holding unit 300 such that the cutting edge 151 of the razor blade 150 of the razor blade assembly 100 cuts in either the first rotational direction CW or the second rotational direction CCW.

[0096] The blade support 160 advantageously comprises a plurality of biasing elements 161. In the example shown in Figs 9A-C, the blade support 160 comprises two biasing elements 161. The razor blade 150 suitably rests against the biasing elements 161 when the razor blade assembly 100 is assembled. The biasing elements may be any suitable biasing elements, such as one or more springs of a suitable type, and may have any suitable shape and / or configuration. In the example shown in Figs. 9A-C, the biasing elements 161 are cantilever springs. The biasing elements 161 may also be referred to as plate springs or leaf springs. The biasing elements 161 may be manufactured from any suitable material, such as plastic. The razor blade 150 rests on the biasing elements 161, and the biasing elements 161 urge the razor blade 150 toward the longitudinal aperture 172 of the blade cover 170, such that the cutting edge 151 of the razor blade 150 protrudes from the longitudinal aperture 172. In other words, the biasing elements 161 push the cutting edge 151 outward of the blade assembly 100. In addition, the biasing elements 161 allow for the razor blade 150 to move within the razor blade assembly, to compensate for minor variations in the level of the skin, for example. The biasing elements 161 may, for example, allow for a movement of about 1 to 3 mm in the direction of extension of the razor blade 150 from the blade cover 170. The blade cover 170 may comprise a plurality of ridges 171 . The ridges 171 may also be referred to as ribs. The ridges 171 may be arranged to extend along a portion of an outer surface of the blade cover 170. The ridges 171 thereby extend or protrude a short distance from the outer surface of the blade cover 170. The ridges 171 are suitably arranged to be in contact with the skin during shaving to thereby protect the skin from the cutting edge 151 of the razor blade(s) 150. Hence, the ridges 171 thereby help in positioning the cutting edge 151 of the razor blade(s) 150 to allow a close and clean hair cut while at the same time not causing nicks or cuts in the skin. In such examples, hair present in a space between adjacent ridges 171 will be cut by the razor blade(s) 150 as the razor head 10 rotates.

[0097] In each razor blade assembly 100, the razor blade 150 is preferably attached to or carried by the blade support 160 as shown in Figs. 9A-C. In an example, the blade support 160 comprises a longitudinal channel 162 comprising the biasing elements 161. This longitudinal channel 162 is then arranged to receive the razor blade 150, and more preferably the blade base 190, to which the razor blade 150 is attached. The blade cover 170 is attached to the blade support 160, such as by a snap-fit connection. Attachment of the blade cover 170 to the blade support 160 maintains the razor blade 150 at a correct position, including blade angle and blade exposure, in the razor blade assembly 100.

[0098] The blade support 160 with the razor blade 150 is at least partly comprised or housed within the blade cover 170. In an embodiment, the blade support 160 with the razor blade 150 is kept in the blade cover 170 by a connection or lock, such as a snap-fit connection.

[0099] Fig. 10A is a schematic illustration of the razor body 20, and Figs. 10B-C illustrate the razor body 20 according to an embodiment in a front view and a sectional view.

[0100] The razor body 20 may also be referred to as a razor handle. The razor body 20 comprises a housing 200. The razor body 20 also comprises an electric motor 15, a motion transfer element 230, and an attachment mechanism 220. The motion transfer element 230 and the attachment mechanism 220 may be separate structural units or, in some examples, parts of the same structural unit. In some examples, at least the tip of the attachment mechanism 220 is configured to be attracted to a magnet in a razor head. Additionally, or alternatively, the attachment mechanism may in some cases be a rod that is insertable into the stem of a razor head, such as the stem 430 of the razor head 10 described herein. In such examples, the same rod may act as the motion transfer element 230. The razor body 20 preferably also comprises a power source 6 for the electric motor 15, i.e., a battery and in particular a rechargeable battery 6. In such a case, the razor body 20 preferably comprises a charging port for charging the rechargeable battery 6. The charging port could, for instance, be in the form of a universal serial bus (USB) C port or a micro USB port as illustrative, but non-limiting, examples. Such a charging port can be arranged in any suitable location and in any suitable position on the razor body 20, such as the first or second longitudinal end of the razor body 20 or the short end of the razor body 20. The electric razor 1 may also comprise a light indicator 5 for showing, for instance, the power status of the battery 6 and / or for showing the charging status or progress of the rechargeable battery 6 during recharging.

[0101] The front view of the razor body 20 of the electric razor 1 shown in Fig. 10B illustrates a power button 7 to switch the electric razor 1 on and off.

[0102] The electric razor 1 is preferably designed to enable both dry and wet shaving. In other words, the electric razor 1 is waterproof and can thereby be used, for instance, in the shower. This means that the power source 6, preferably rechargeable battery 6, and the electric motor 15 are sealed within the razor body 20 with a watertight seal to prevent ingress of water within the compartment(s) of the razor body 20 housing the power source 6 and the electric motor 15. Advantageously, the power source 6 and the electric motor 15 are enclosed in the housing 200 of the razor body 20, wherein the housing 200 is watertight.

[0103] In some examples, the razor body 20 comprises the razor housing 200 and two body halves (not shown). In such examples, a first body half comprises the electric motor 15 and the power source 6, preferably a rechargeable battery 6. The two body halves are connected to each other to enclose the electric motor 15 and the rechargeable battery 6, and the two connected body halves then fit into the razor housing 200 to form the razor body 20.

[0104] In the example shown in Figs. 10B-C, the motion transfer element 230 comprises a first, or inner, shaft 231 and a second, or outer, shaft 232. In the example of Figs. 10B-C, the attachment mechanism 220, configured for receiving the razor head 10 for attachment to the razor body 20, is realized through the configuration of the outer surface 232a of the second shaft 232. The outer surface 232a of the second shaft 232 comprises at least one groove 232b configured to receive any suitable protruding part of the holding unit 300, such as a hook-shaped part of one or more of the hook-shaped protrusion 331 of the plurality of protrusions 330a arranged on the first holding part 330a of the razor head 10. The groove 232b may also be referred to as a track or an indentation. The groove 232b may extend along the circumference of the second shaft 232. Alternatively, a plurality of grooves 232b may be distributed along the circumference of the second shaft 232. When a protruding part, of any suitable type having any suitable shape, has been received in the groove, the corresponding shapes of the groove 232b and the protruding part interlock and thereby form a firm attachment between the razor head 10 and the razor body 20. In examples such as those illustrated in Figs. 11 E, 12C and 12D, and described in more detail below, the protruding part may be a hook-shaped protrusion 331 of the plurality of protrusions 330a arranged on the first holding part 330a of the razor head 10, which is received in the groove 232b or plurality of grooves 232b. In such examples, the corresponding shapes of the groove 232b, or plurality of grooves 232b, and the hook-shaped protrusion 331 interlock and thereby form a firm attachment between the razor head 10 and the razor body 20. The razor head 10 and the razor body 20 may be said to be connected in a form-locking relationship, whereby the attachment mechanism 220 may be described as a form-locking attachment mechanism 220. Advantageously, the connection between the holding unit 300 of the razor head 10 and the attachment mechanism 220 of the razor body 20 is a snap-fit connection . In the example shown in Figs. 10B-C, the outer surface 232a of the second shaft 232 is configured such that one or more of the protrusions 330 of the holding unit 300 may snap into attachment with the outer surface 232a when a force is applied to the razor head 10 in the direction of the razor body 20, or vice versa. In other words, to attach the razor head 10 to the razor body 20, a user presses the razor head 10 onto the motion transfer element 230, which in the example of Figs. 10AB-C comprises an inner and an outer shaft, i.e., the first shaft 231 and the second shaft 232. The user pushes the razor head 10 or the razor body 20 in the longitudinal direction of the razor body 20, whereby the razor head 10 snaps into position and is securely attached to the razor body 20. Naturally, the user may equally apply a force to the razor head 10 and an oppositely directed force to the razor body 20 to snap the razor head 10 onto the razor body 20 to achieve the attachment between the razor head 10 and the razor body 20.

[0105] Figs. 11A-E illustrate the razor body 20 according to an embodiment in various views. The razor body 20 comprises the attachment mechanism 220 configured for receiving the razor head 10 for attachment to the razor body 20. The attachment mechanism 220 may thus be said to be configured to enable attachment of the razor head 10 to the razor body 20. Advantageously, the attachment mechanism 220 is configured to allow a snap-fit connection between the razor head 10 and the razor body 20, whereby the razor head 10 is arranged on the attachment mechanism 220 and snaps into place when a force is applied to the razor head 10 in the direction of the razor body 20. Figs. 11C-E illustrate the motion transfer element 230, which designed and constructed to enable dual rotation of the razor head 10 when the razor head 10 is mounted to the razor body 20. The motion transfer element 230 may also be referred to as a shaft element. The motion transfer element 230 may be any suitable element that is capable of transferring rotational movement generated by the motor 15 to the razor head 10. In other words, the motion transfer element 230 transmits power from the electric motor to the razor head 10 through rotation, in the form of rotational movement of the razor head 10. In some examples, the motion transfer element 230 is a shaft, or a combination of components comprising a plurality of shafts 231 , 232. In some examples, such as those shown in Fig. 12A-D, as well as Figs. 10B-C and 11A-D, the motion transfer element 230 comprises a first shaft 231 and a second shaft 232. The first shaft 231 may also be referred to as an inner shaft. The second shaft 232 may also be referred to as an outer shaft. In such examples, the second shaft 232 is advantageously mounted on, or to, the first shaft 231. In some examples, the second shaft 232 is arranged at least partly on top of and at least partly enclosing the first shaft 231 , as illustrated in Figs. 11 C-D.

[0106] The motion transfer element 230 is advantageously configured to engage a drive element 8 in the electric razor 1, wherein the drive element 8 is rotatable by the electric motor 15. Rotation of the drive element s causes rotation of the motion transfer element 230 and thereby rotation of the razor head 10, when attached to the razor body 20. In examples where the motion transfer element 230 comprises a second shaft 232 arranged at least partly on top of and at least partly enclosing a first shaft 231 , a first end 231a of the first shaft 231 may, for instance, have a shape or form facilitating attachment of the first shaft 231 , and thereby the motion transfer element 230, to the drive element 8. For instance, the first end 231a of the first shaft 231 may have a square cross-section as shown in Figs. 12C-D. In such examples, the drive element 8 preferably comprises a square indentation or slot, into which the first end 231 a of the first shaft 231 is inserted. This means that a rotation of the drive element 8 by the electric motor 15 will also cause a rotation of the motion transfer element 230. In examples where the motion transfer element 230 consists of a single shaft, a first end of the single shaft suitably has a shape or form facilitating attachment to the drive element 8. Other mechanisms of interlocking the drive element 8 and the motion transfer element 230 are equally possible and can be used to transfer a rotation of the drive element 8 into a rotation of the motion transfer element 230, and therefrom to the razor head 10, when attached to the razor body 20.

[0107] In some embodiments, the motion transfer element 230 extends into a central space 140 of the razor head 10. When inserted into the central space 140, the motion transfer element 230 interlocks with the holding unit 300 to achieve a firm connection, which maintains a stabile hold as the motion transfer element 2130 rotates. Thereby, rotation of the motion transfer element 230 is transmitted to the razor head 10 and, subsequently, the razor head 10 rotates together with the motion transfer element 230.

[0108] In the example illustrated in Figs. 12A-D, the motion transfer element 230 comprises a first shaft 231 and a second shaft 232. In such examples, the second shaft 232, which may also be referred as the outer shaft, is configured to attach to the holding unit 300 of the razor head 10. The second shaft 232 is configured to protrude through a central aperture 310a of the holding unit 300. In the example shown in Figs. 11C-E, the second shaft 232 is configured to protrude through a central aperture 310a of the first holding part 310. The second shaft 232 comprises an outer surface 232a configured to achieve a friction grip attachment with the circumference of the slanting central aperture 310a of the first holding part 310. In other words, the second shaft 232 is elastically deformed and pressed though the central aperture 310a. When the second shaft 232 has been inserted through the central aperture, the second shaft 232 strives to expand to regain its undeformed state and exerts an expanding force on the circumference of the central aperture, thereby achieving a friction grip against the first holding part 310.

[0109] Figs 11A-E illustrate a release mechanism 210, comprising a connector 211, a collar 212 and a cuff 213. The collar 212 may also be referred to as a lever. The collar 212 comprises a tab 212a The tab 212a is arranged to allow a user to grip the tab 212a, press the tab 212a in the circumferential direction of the collar 212, whereby the collar 212 rotates in that direction. The release mechanism 210 is advantageously configured such that when the collar 212 has been rotated a predetermined distance in the circumferential direction, a razor head 10 attached to the razor body 20 detaches from the razor body 20. Further examples of the release mechanism 210 will be described below, with reference to Figs. 11A-E.

[0110] Figs. 11 A-E also illustrate the razor body 20 comprising the release mechanism 210 configured to release an attached razor head 10 from the razor body 20. In the example illustrated in Figs. 11 A-E, the release mechanism 210 comprises the connector 211, the collar 212 and the cuff 213. The collar 212 comprises a tab 212a. The tab 212a may also be referred to as an ejection button.

[0111] The cuff 213 extends circumferentially around the razor body 20 at a first end 20a of the razor body 20. The first end 20a of the razor body 20 is the longitudinal end of the razor body 20 that is closest to the razor head 10, when the razor head 10 is attached to the razor body 20 The cuff 213 is suitably arranged adjacent to the housing 200 of the razor body 20 and rests against the housing 200, in an idle state of the release mechanism 210. The cuff 213 advantageously comprises a first portion 213a and a second portion 213b. The first portion 213a of the cuff 213 may be referred to as a top portion of the cuff 213. The second portion 213b of the cuff 213 may be referred to as a bottom, or lower, portion of the cuff 213. The first portion 213a of the cuff 213 is advantageously the portion of the cuff 213 that is closest to the razor head 10, when the razor head 10 is attached to the razor body 20. Correspondingly, the second portion 213b of the cuff 213 is advantageously the portion of the cuff 213 that is furthest from the razor head 10, when the razor head 10 is attached to the razor body 20.

[0112] The collar 212 also extends circumferentially around the razor body 20 at the first end 20a thereof. The collar 212 at least partly contacts a portion of the cuff 213, such that the collar 212 circumferentially overlays that portion of the cuff 213. As can be seen in Figs. 11C-E, the collar 212 advantageously overlays the first portion 213a of the cuff 213, at least partly. The first portion 213a of the cuff 213 is thus configured to be arranged underneath the collar 212. The collar 212 is slidingly attached to the cuff 213, such that the collar 212 may rotate while the cuff 213 remains stationary.

[0113] The collar 212 comprises at least one gripping element, which a user can grip in order to rotate the collar 212 circumferentially. In the example shown, the gripping element is realized by the tab 212a. The tab 212a may also be referred to as a lever, or a button. Any suitable gripping element may be arranged on the collar, as long as it is configured to rotate the collar 212 when a user manipulates the gripping element. Multiple gripping elements, such as multiple grooves, may also be used instead of, or in addition to, a single gripping element such as the tab 212a.

[0114] The connector 211 is arranged to interconnect the collar 212 and the cuff 213. The connector 211 is arranged such that, when the collar 212 is rotated in the circumferential direction, the rotation of the collar 212 pulls the cuff 213 and the collar 212 in the longitudinal direction of the razor body 20, toward the razor head 10. In some embodiments, the cuff 213 and collar 212 are displaced approximately 5 mm in the longitudinal direction, away from the razor body 20. The longitudinal movement of the collar 212 exerts a longitudinal force on an attached razor head 10, whereby the razor head 10 is pushed out of its attached position on the razor body 20. In the illustrated examples, the holding unit 300 is pushed in the longitudinal direction, away from the razor body 20, such that at least some of the protrusions 330 of the holding unit 300 are pushed out of the one or more grooves 232b arranged on the outer surface 230a of the motion transfer element 230. Thereby, the friction grip connection, or snap-fit connection, between the razor head 10 and the motion transfer element 230 is released. Advantageously, when the friction grip attachment has been released, the at least some of the protrusions 330 of the holding unit 300 will push the razor head 10 away from the razor body 20. Thus, the release mechanism 210 is easily manipulated to achieve a removal of the razor head 1. By turning the collar 212 a predetermined distance in the circumferential direction, the user can release the razor head 10 from the razor body 20, for disposal and / or replacement. Such a predetermined distance may be any suitable distance that is sufficient for avoiding an accidental release of the razor head 10. In the examples where the tab 212a or a similar actuator is used, the distance is suitably determined such that an accidental tap or slight push on the tab 212a is not enough to release the razor head 10, but a deliberate rotation of the collar 212 is required. In some preferred embodiments, the razor head is released when the collar 212 has been rotated approximately 45 degrees.

[0115] Although the connector 211 may be configured in any suitable way, in the example illustrated in Figs.

[0116] 11C-E, the connector 211 comprises an annular base 211a. The annular base 211a may also be referred to as a plate, disk or washer. The annular base 211 a is configured to at least partly rest against the cuff 213, such that a force pulling on the annular base 211a in a direction along the longitudinal axis of the razor body 20, toward the razor head 10, results in the annular base 211a pushing the cuff 213 in that direction. In other words, a pulling or pushing force on the annular base 211a pushes the cuff 213 in the same direction. The annular base 211a and the cuff 213 may be configured with complementary shapes to enable an optimized grip as the connector 211 causes a longitudinal movement of the cuff 213.

[0117] Advantageously, a plurality of engaging members 211b are connected to and extend from the annular base 211 a. The engaging members 211 b are configured to be at least partly inserted into a corresponding groove or indentation 212b on an inner surface of the collar 212. When arranged in position in the razor body 20, the connector 211 thus connects the cuff 213 and the collar 212. To activate the releasing function, a user engages the release mechanism 210 by rotating the collar 212, for instance by gripping the tab 212a. When the collar 212 rotates, the engaging members 211b attached to the inner surface of the collar are rotated with the collar 212. The rotation of the engaging members 211b pulls on the annular base 211a, whereby the cuff 213 and collar 212 are displaced in the longitudinal direction of the razor body 20, toward the razor head 10. Since the collar 212 is slidably arranged overlaying the first portion 213a of the cuff 213, the cuff 213 will not rotate when the collar 212 is rotated. In other words, rotational motion of the collar 212 is not transferred to the cuff 213. The engaging members 211b may be configured as spirally extending members that pull on the annular base 211a when the collar 212 is rotated. The connector 211 may be configured as a resilient connector, whereby the engaging members 211b will strive to return to their initial idle position when the user releases their hold of the collar 212. In such an example, the connector 211 may be referred to as a biasing element, a resilient element, or a spring. The plurality of engaging members 211b and the annular base 211a may be produced as an integrated unit or produced separately and thereafter firmly joined together.

[0118] As explained above, the cuff 213 pushes on the collar 212 which in turn pushes the holding unit 300 of the razor head 10 from its locked position, for example from a locked position into which at least some of the plurality protrusions 330 have snapped. Activating the release mechanism 210 thus releases the razor head 10 from the razor body 20.

[0119] This means that the razor head 10 can be easily removed from the razor body 20. The razor head 10 may either be discarded once the razor blade(s) 150 is / are worn out, and thereby be replaced by a fresh razor head 10. The razor head 10 could also be removed from the razor body 20 to enable a thoroughly cleaning of the razor head 100, if needed, after which the cleaned razor head 10 may be re-attached to the razor body 20. In addition, a user may which to replace a razor head 10 having a cylindrical shape with a razor head 10 having a conical or frustoconical shape to achieve a better precision when shaving a particular body part. A user is also able to replace the conical or frustoconical razor head with a conical or frustoconical razor head 10 having a different angle and / or slant height, when shaving different body parts, or different areas of a certain body part, thereby achieving a precise shave in an ergonomical manner.

[0120] Figs. 12A-D illustrate the electric razor 1 according to an embodiment in various views. As illustrated in Figs. 12A-D, the electric razor 1 comprises the razor head 10 as disclosed herein and the razor body 20 as disclosed herein. The razor body 20 comprises the electric motor 15 and the motion transfer element 230, which is connected to the electric motor 15 and arranged to transfer rotational motion generated by the electric motor 15. In such examples, the electric motor 15 rotates the motion transfer element 230 in the first rotational direction CW or the second rotational direction CCW, and the motion transfer element 230 thereby transmits the rotational motion to the razor head 10, which then rotates in the first direction CW or the second direction CCW.

[0121] As shown in Figs. 12A-D, the razor body 20 also comprises the attachment mechanism 220 configured for receiving the razor head 10 for attachment to the razor body 20. The attachment mechanism may thus be said to be configured to enable attachment of the razor head 10 to the razor body 20. The attachment mechanism 220 is advantageously configured to provide an audible indication indicating that the razor head 10 is firmly and correctly attached to the razor body 20. Such an audible indication may be a “click” sound. Alternatively or additionally, a visual indication may be provided. Such a visual indication may be a light source that turns on or changes color when the razor head 10 is firmly and correctly attached to the razor body 20. A tactile indication may be provided instead of, or in addition to, the audible and / or visual indication. Such a tactile indication may be a vibration of the razor body 20.

[0122] Figs. 12A-D also illustrate the razor body 20 comprising the release mechanism 210 configured to release the razor head 10 from the razor body, when mounted on the razor body 20. In addition, Figs. 12A-D illustrate the actuator 250 of the razor body 20. The actuator 250 is configured to control the rotational direction of the motion transfer element 230 such that the razor head 10, when mounted on the razor body 20, selectively rotates in the first rotational direction CW or the second rotational direction CCW, thereby enabling a selective cutting by the cutting edge 151 of the first razor blade assembly 101 and the cutting edge 151 of the second razor blade assembly 102. In other words, a user may manipulate the actuator 250 to move it to a first position, causing the razor head 10 to rotate in the first rotational direction CW, or a second position, causing the razor head 10 to rotate in the second rotational direction CCW. The user may also move the actuator 250 to or from a third position, which may also be referred to as a starting, ending or idle position, where the razor head 10 is in a fixed, inactive, position and does not rotate. The actuator 250 may also be referred to as a tab, button, peg, lever, etc., and may have any suitable shape and / or size. The actuator 250 is suitably arranged to control the electric motor 15, so that the electric motor 15 generates rotational movement in the first rotational direction CW or the second rotational direction CCW, which movement is then transferred via the motion transfer element 230 to the rotatable razor head 10.

[0123] The motion transfer element 230 is configured for attachment to the razor head 10. Such an attachment may be achieved in a number of ways. Advantageously, the razor head 10 is attached to the motion transfer element 230 in a form-locking manner, whereby complementary shapes of the motion transfer element 230 and the razor head 10 interlock to form a firm connection, without affecting the rotational ability of the motion transfer element 230. Such a form-locking mechanism is advantageously achieved through a snap-action type connection between the motion transfer element 230 and the razor head 10.

[0124] The razor head 10 is rotated by the electric motor 15 in the electric razor 1 to achieve a rotational cutting action as, at least, the first razor blade assembly 101 and the second razor blade assembly 102 are rotated, which is indicated by the arrows at CW and CCW in Fig. 12B. Hence, the electric razor 1 and the rotatable razor head 10 of the invention achieve a dual rotation hair-cutting movement and action. This dual rotation and cutting action of the razor head 10 reduces the cutting force on the plurality of razor blade assemblies 100, such as the first razor blade assembly 101 and the second razor blade assembly 102, when cutting hair. This achieves a comfortable and effortless hair cutting and shaving and is in particular beneficial for cutting thick, long or curly hair. Another significant advantage of reducing the cutting force by the dual rotation razor head movement and cutting is that the wear of the edge of the razor blade 150 is reduced meaning that the longevity of the at least one razor blade 150 is thereby increased.

[0125] The electric motor 15 of the electric razor 1 causes rotation of the motion transfer element 230, and therefrom transferred to the razor head 10 when the razor head 10 is mounted to the razor body 20 and attached to the motion transfer element 230, relative to the razor body 20, which remains stationary during rotation of the motion transfer element 230 and razor head 10. Since each of the plurality of razor assemblies 100 is fixedly attached to the razor head 10, the razor assemblies 100 will thereby also rotate causing rotation of the razor blade 150 in the respective razor blade assembly 100.

[0126] As an illustrative example, the electric razor 1 and its including electric motor 15 is preferably capable of rotating the razor head 10, when mounted to the razor body 20, at a speed selected within an interval of from 1 ,000 up to 3,000 revolutions per minute (RPM), more preferably from 1 ,500 up to 2,500 RPM, such as about 2,000 RPM If the razor head 10 comprises multiple 2N>2 razor blade assemblies 100 with 2N razor blades 150 oriented such that N of the 2N cutting edges 151 cut in the first rotational direction CW and N of the 2N cutting edges 151 cut in second rotational direction CCW, this gives N times the number of revolutions per minute cuts per minute. For instance, a rotational speed of 2,000 RPM with three razor blades 150 oriented such that the cutting edges 151 cut in the first rotational direction CW and three razor blades 150 oriented such that the cutting edges 151 cut in the second rotational direction CCW would give about 6,000 cuts per minute in the first rotational direction CW and 6,000 cts per minute in the second rotational direction CCW.

[0127] The electric razor 1 with the replaceable and rotatable razor head 10 is well suited for body grooming and shaving body and / or pubic hair. The electric razor 1 is designed to be easy to use and can even shave hair on hard-to-reach areas on the body due to the ergonomic design of the electric razor 1. The dual rotation of the razor head 10 achieves a more efficient cutting, allowing cutting of hair that is generally difficult to cut, such as long and curly hair. The dual rotation motion also reduces the cutting force, which allows for a more comfortable shaving experience and an increased longevity of the razor blade(s) 150 in the razor blade assemblies 100. Thus, the electric razor 1 combines the convenience of electrical shaving with the precision and closeness of a traditional manual razor. Fig. 13 illustrates an exemplary method 1000 for assembling and manufacturing the razor head 10 according to any embodiment described herein. The steps may be taken in any suitable order, optional steps are indicated by dashed lines.

[0128] The method comprises providing (S1010) modular razor blade assemblies 100, such as any of the modular razor blade assemblies 100, 101 , 102, 103, 104 described herein. The razor blade assemblies 100 may be provided in any suitable way. In some examples, the step of providing the razor blade assemblies 100 comprises arranging (S1011) a razor blade 150 in an outer piece 113 of a razor blade assembly 100, such that the razor blade 150 rests within a space formed within the outer piece 113, such as the space 113a (see Fig. 4B). Thereafter, the method may comprise placing (S1012) an inner piece 114 overlaying the razor blade 150. When the inner piece 114 has been properly positioned, the method may comprise firmly connecting (S1013) the inner and outer pieces 113, 114 together using a heat press, or similar machinery and / or methods.

[0129] The method further comprises mounting (S1020) the modular razor blade assemblies 100 to a holding unit, such as the holding unit 300, 400 described herein. The modular razor blade assemblies 100 may be mounted to the holding unit 300, 400 by connecting (S1021) connectors on the razor blade assemblies 100 with corresponding connectors on the holding unit 300, 400. Any suitable connectors or connecting mechanisms may be used, such as any of those described herein.

[0130] The method further comprises securing (S1030) the modular razor blade assemblies 100 and holding unit 300, 400 together, such that they may not be readily separated. In some examples, razor blade assemblies 100 and holding unit 300, 400 may be secured together by means of heat pressing (S1031 ) the razor blade assemblies and holding unit.

[0131] A complementary or alternative method for assembling the razor head 10 comprises providing a plurality of razor head assemblies 100, 101, 102, 103, 104 having a first end 100a, 101a, 102a, 103a, 104a and a second, opposite, end 100b, 101b, 102b, 103b, 104b and comprising a razor blade 150 having a cutting edge 151 . Such a method also comprises providing a holding unit 300, 400 comprising a first holding part 310, 410 and a second holding part 310, 410. The method further comprises attaching the first end 101a of a first razor blade assembly 101 of the plurality of razor blade assemblies 100 to the first holding part 310, 410 of the holding unit 300, 400 and attaching the second end 101b of the first razor blade assembly 101 to the second holding part 320, 420 of the holding unit 300, 400 and attaching the second end 102b of a second razor blade assembly 102 of the plurality of razor blade assemblies 100 to the first part 310, 410 of the holding unit 300, 400 and attaching the first end 102a of the second razor blade assembly 102 to the second part 320, 420 of the holding unit 300, 400.

[0132] It is to be understood that the subject matter described herein is not limited in its application to the details of construction and the arrangement of components set forth in the description herein or illustrated in the drawings hereof. The subject matter described herein is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including,” “comprising," or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0133] It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and / or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the embodiments of the present technology without departing from its scope. While the dimensions, and types of materials described herein are intended to define the parameters of the embodiments of the present technology, they are by no means limiting and are exemplary embodiments. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the embodiments of the present technology should, therefore, be determined with reference to the present disclosure, along with the full scope of equivalents. In the disclosure, the terms "including" and "in which” are used as the plain-English equivalents of the respective terms "comprising" and "wherein." Moreover, in the disclosure, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects. Further, the limitations of the disclosure are not written in means - plus-function format and are not intended to be interpreted based on 35 U.S.C. § 112(f), unless and until such limitations expressly use the phrase “means for” followed by a statement of function void of further structure.

[0134] The embodiments described above are to be understood as a few illustrative examples of the present invention. It will be understood by those skilled in the art that various modifications, combinations and changes may be made to the embodiments without departing from the scope of the present invention. In particular, different part solutions in the different embodiments can be combined in other configurations, where technically possible.

Claims

CLAIMS1. A rotatable modular razor head (10) for an electric razor (1), comprising:- a plurality of modular razor blade assemblies (100), each modular razor blade assembly (101,102,103,104) comprising a razor blade (150) having a cutting edge (151); and - a holding unit (300, 400),wherein the razor blade assemblies (101, 102, 103, 104) are attachable to the holding unit (300, 400) and the holding unit (300, 400) is configured to be rotatably attached to a body (20) of the electric razor (1).

2. The modular razor head (10) according to claim 1 , wherein each razor blade assembly (101 ,102,103,104) comprises a plurality of lateral ribs (110).

3. The modular razor head (10) according to claim 2, wherein, in an assembled state of the modular razor head (10), the ribs (110) of at least two adjacent razor blade assemblies (101, 102.

103. 104) are offset in relation to each other.

4. The rotatable razor head (10) according to claim 3, wherein the holding unit (300, 400) is configured to allow the at least two adjacent razor blade assemblies (101 , 102, 103, 104) to be installed such that the ribs (110) of the at least two adjacent razor blade assemblies (101, 102, 103. 104) are arranged offset in relation to each other.

5. The modular razor head (10) according to any preceding claim, wherein each razor blade assembly (101, 102, 103, 104) comprises at least one guide comb (111) with a set of guide teeth (112) in connection with the razor blade (150).

6. The modular razor head (10) according to claim 5, wherein, in an assembled state of the modular razor head (10), the guide teeth (112) of the respective guide combs (111) of at least two adjacent razor blade assemblies (101 , 102, 103, 104) are offset in relation to each other.

7. The rotatable razor head (10) according to claim 6, wherein the holding unit (300, 400) is configured to allow the at least two adjacent razor blade assemblies (101 , 102, 103, 104) to be installed such that the guide teeth (112) of the respective guide combs (111) of the at least twoadjacent razor blade assemblies (101, 102, 103, 104) are arranged offset in relation to each other.

8. The modular razor head (10) according to any preceding claim, wherein the razor blade assemblies (101,102,103,104) are symmetrical and / or all of the razor blade assemblies (101,102,103,104) of the plurality of modular razor blade assemblies (100) are essentially identical.

9. The modular razor head (10) according to any preceding claim, wherein the razor blade assemblies (101,102,103,104) are individually arrangeable in the modular razor head (10) to cut in a first rotational direction (CW) or in a second, opposite, rotational direction (CCW).

10. The modular razor head (10) according to any preceding claim, wherein the holding unit (300, 400) comprises a first holding part (310, 410) and a second holding part (320, 420), and, in an assembled state of the modular razor head (10), each modular razor blade assembly (101, 102, 103, 104) is arranged between the first holding part (310, 410) and the second holding part (320, 420), such that a first longitudinal end (101a, 102a, 103a, 104a) of at least one modular razor blade assembly (101, 102, 103, 104) is attached to the first holding part (310, 410) and a second, substantially opposite, longitudinal end (101b, 102b, 103b, 104b) of the at least one modular razor blade assembly (101, 102, 103, 104) is attached to the second holding part (320, 420).

11. The modular razor head (10) according to claim 10, wherein the first holding part (410) and / or the second holding part (420) comprises a raised portion (440).

12. The modular razor head (10) according to any one of claims 10 or 11, wherein a first modular razor blade assembly (101, 102, 103, 104) is attached to the first holding part (310, 410) of the holding unit (300, 400) at the first longitudinal end (101a, 102a, 103a, 104a) and attached to the second holding part (320, 420) of the holding unit (300, 400) at the second longitudinal end (101b, 102b, 103b, 104b); and a second modular razor blade assembly (101, 102, 103, 104) is attached to the second holding part (320, 420) of the holding unit (300, 400) at the first longitudinal end (101a, 102a, 103a, 104a) and attached to the first holding part (310, 410) of the holding unit (300, 400) at the second longitudinal end (101b, 102b, 103b, 104b).

13. The modular razor head (10) according to any of claims 10 to 12, wherein the first holding part (410) of the holding unit (400) and / or the second holding part (420) of the holding unit (400) comprises a plurality of apertures (470) and / or grooves (471), configured to interlock with the longitudinal ends (101a, 102a, 103a, 104a, 101b, 102b, 103b, 104b) of the razor blade assemblies (101 , 102, 103, 104) in a form-locking relationship.

14. The modular razor head (10) according to any preceding claim, wherein the holding unit (400) comprises a stem (430) configured to transfer rotational motion from the razor body (20) to the rotatable razor head (10).

15. The modular razor head (10) according to any preceding claim, wherein the rotatable razor head (10) is removable from the body (20) of the electric razor (1).

16. The modular razor head (10) according to claim 15, wherein the holding unit (300, 400) is configured to be attachable to the razor body (20) of the electric razor (1) such that, when attached, a longitudinal axis (10a) of the razor head (10) is substantially parallel with a longitudinal axis (20a) of the razor body (20) of the electric razor (1).

17. The modular razor head (10) according to any preceding claim, wherein the modular razor head (10) is cylindrical, conical or frustoconical, or a combination of cylindrical, conical and / or frustoconical.

18. A rotatable razor head (10) for an electric razor (1), the rotatable razor head (10) comprising:■ a first razor blade assembly (101) comprising a razor blade (150) having a cutting edge (151); - a second razor blade assembly (102) comprising a razor blade (150) having a cutting edge (151);■ a holding unit (300, 400) configured to be attachable to a body (20) of the electric razor (1); whereinthe first and second razor blade assemblies (100, 101 , 102) are attached to the holding unit (300, 400);the razor head (10) is configured to be rotated in a first rotational direction (CW) and in a second, substantially opposite, rotational direction (CCW);the cutting edge (151) of the razor blade (150) of the first razor blade assembly (101) is arranged to cut in the first rotational direction (CW), and the cutting edge (151) of the razor blade (150) of the second razor blade assembly (102) is arranged to cut in the second rotational direction (CCW).

19. The rotatable razor head (10) according to claim 18, wherein the razor head (10) comprises a plurality of first razor blade assemblies (101) and a plurality of second razor blade assemblies (102).

20. An electric razor (1) comprising a rotatable razor head (10) according to any one of claims 1 to 19 and a razor body (20), the razor body (20) comprising:- a housing (200);- an electric motor (15);a motion transfer element (230) connected to the electric motor (15) and arranged to transfer rotational motion generated by the electric motor (15); andan attachment mechanism (220) configured for receiving the razor head (10) for attachment to the razor body (20).

21. The electric razor (1) according to claim 20, wherein the razor body (20) further comprises an actuator (250) configured to control the rotational direction of the motion transfer element (230) such that the razor head (10), when mounted on the razor body (20), selectively rotates in the first rotational direction (CW) or the second rotational direction (CCW), thereby enabling a selective cutting by the cutting edge (151) of the first razor blade assembly (101) and the cutting edge (151) of the second razor blade assembly (102).

22. The electric razor (1) according to claim 20 or 21, wherein the motion transfer element (230) comprises a first, or inner, shaft (231) and a second, or outer, shaft (232).

23. The electric razor (1) according to any of claims 20 to 22, wherein the razor body (20) further comprises a release mechanism (210) configured to release the razor head (10) from the razor body (20), when mounted on the razor body (20).

24. The electric razor (1) according to claims 23, wherein the release mechanism (210) comprises a connector (211), a collar (212) and a cuff (213), the collar (212) preferably comprising a tab (212a).

25. A kit of parts comprising a razor body (20) and a plurality of rotatable razor heads (10) according to any of claims 1 to 19, wherein at least two of the plurality of rotatable razor heads (10) areconical or frustoconical and the slant of a first conical or frustoconical razor head (10a) is different from the slant of a second conical or frustoconical razor head (10b) of the plurality of razor heads.

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