Abstract:
The invention relates to a shaving head comprising at least one cutting unit ( 7, 7 A,  7 B). The cutting unit comprises a ring-like skin-supporting tilting member, being tillable relative to a shaving head main body ( 4, 8 ) about a first tilting axis, an external cutting member, an internal cutting member, and a retainer. According to the invention, the retainer is a multi-purpose retainer in that it provides simultaneously a locking function, a secondary tilting function and an anti-floating function. By virtue of the multi-purpose retainer, the shaving device delivers a high shaving performance and is also easy to clean.

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to a shaving device for skin hairs. More specifically, the invention relates to a shaving head, which comprises at least one cutting unit. The cutting unit comprises an external cutting member and an internal cutting member. The external cutting member has a skin shaving surface, while the internal cutting member is drivable for movement along an opening structure in said skin shaving surface for cutting through hairs passing said opening structure. 
       BACKGROUND OF THE INVENTION 
       [0002]    For such a shaving device it is desirable that the device delivers a high shaving performance and is also easy to clean. Generally speaking, a high shaving performance requires more complex designs of the shaving heads. These higher complexities generally result in more complicated cleaning of the shaving heads, particularly their cutting units. 
       SUMMARY OF THE INVENTION 
       [0003]    It is an object of the invention to provide a shaving device delivering a high shaving performance, while allowing to be easily and adequately cleaned. 
         [0004]    For this purpose, the invention provides a shaving head according to the “Multi-Purpose Retainer Principle”, which abbreviative expression is used herein for ease of presentation and understanding. The expression will be defined and explained hereinbelow. 
       I. Multi-Purpose Retainer Principle 
       [0005]    As used herein, a shaving head according to said Multi-Purpose Retainer Principle is a shaving head for use in a shaving device for skin hairs, said shaving head comprising a shaving head main body and at least one cutting unit, wherein said cutting unit comprises: 
         [0006]    a ring-like skin-supporting tilting member, which comprises a ring-like skin-supporting surface, and which comprises two opposed first suspension parts, which are located at mutually different locations along the ring-like skin-supporting tilting member, and via which the skin-supporting tilting member is suspended relative to the shaving head main body in a first tiltable manner about a first tilting axis; 
         [0007]    an external cutting member comprising a skin-shaving surface, which is interrupted by an opening structure for allowing hairs to pass; 
         [0008]    an internal cutting member, which is drivable for movement along said opening structure in the skin-shaving surface of the external cutting member for cutting through hairs passing said opening structure; and 
         [0009]    a retainer; 
         [0010]    and wherein: 
         [0011]    said cutting unit has an assembled condition for operation of the shaving head and a disassembled condition for cleaning of the cutting unit, wherein the ring-like skin-supporting tilting member, the external cutting member, the internal cutting member and the retainer in the assembled condition and disassembled condition are, respectively, assembled and at least partly disassembled relative to one another; 
         [0012]    in said assembled condition the cutting unit has a skin contacting surface for contacting skin during a shaving action, said skin contacting surface comprising said ring-like skin-supporting surface and said skin-shaving surface, wherein the skin-supporting surface at least partly surrounds the skin-shaving surface; 
         [0013]    said assembled condition of the cutting unit is obtainable from said disassembled condition in an opened condition of the shaving head by manually bringing the retainer into a locked condition relative to other parts of the cutting unit, while said disassembled condition is obtainable from said assembled condition by manually bringing, in said opened condition of the shaving head, the retainer out of said locked condition; 
         [0014]    the ring-like skin-supporting tilting member further comprises two opposed second suspension parts, which are located at mutually different locations along the ring-like skin-supporting tilting member, and via which in said assembled condition the external cutting member is suspended relative to the ring-like skin-supporting tilting member in a second tiltable manner about a second tilting axis extending at a non-zero angle relative to said first tilting axis; and 
         [0015]    said locked condition of the retainer in said assembled condition of the cutting unit corresponds to a relative orientation of the retainer within the cutting unit, which relative orientation of the retainer effectuates: 
         [0016]    (i) that the external cutting member is suspended relative to the ring-like skin-supporting tilting member in said second tiltable manner; and 
         [0017]    (ii) that the external cutting member is disabled to translate over more than a play distance of 2.0 millimeter in a direction transverse to said second tilting axis. 
         [0018]    As mentioned, said play distance is 2.0 millimeter. Preferably, however, said play distance is 1.0 millimeter, more preferably 0.5 millimeter, still more preferably 0.3 millimeter. 
         [0019]    From the above recitation it follows that a shaving head according to the Multi-Purpose Retainer Principle comprises the abovementioned retainer, which simultaneously serves, inter alia, the following multiple purposes. 
         [0020]    (1) Locking Function: 
         [0021]    A first one of the multiple, simultaneous purposes is that this retainer can be manually operated for unlocking and locking, i.e. disassembling and assembling, respectively, the parts of the cutting unit. In view of this, said first purpose of the retainer will hereinafter also be referred to as the “locking function” effectuated by the retainer. 
         [0022]    (2) Secondary Tilting Function: 
         [0023]    A second one of the multiple, simultaneous purposes is that the retainer effectuates the said suspension of the external cutting member in said second tiltable manner, which, in simultaneity with the said suspension of the skin-supporting tilting member in said first tiltable manner, brings about that the skin shaving surface of the external cutting member is allowed to continuously and automatically adapt its orientation within the shaving head as a user moves the shaving head along a three-dimensionally curved skin surface. In view of this, said second purpose of the retainer hereinafter will also be referred to as the “secondary tilting function” effectuated by the retainer. 
         [0024]    (3) Anti-Floating Function: 
         [0025]    A third one of the multiple, simultaneous purposes is that the retainer effectuates that the external cutting member is disabled to translate over more than said play distance in a direction transverse to the second tilting axis. It is noted that shaving heads are known in which an external cutting member is enabled to translate over more than said play distance in a direction transverse to directions about which the external cutting member is allowed to tilt. An external cutting member being translatable in such a manner is sometimes referred to as a “floating” member. In view of this, said third purpose of the retainer hereinafter will also be referred to as the “anti-floating function” effectuated by the retainer. 
         [0026]    In summary, the retainer of the shaving head according to the invention provides simultaneously the locking function, the secondary tilting function and the anti-floating function. Therefore, the retainer of the shaving head according to the invention hereinafter also is referred to as the “multi-purpose retainer”. 
         [0027]    The shaving head according to the invention has a high shaving performance, because of the secondary tilting function in combination with the anti-floating function. As explained, the secondary tilting function allows the external cutting member to continuously and automatically adapt its orientation within the shaving head as a user moves the shaving head along a three-dimensionally curved skin surface. Thanks to this continuously and automatically adaptable orientation, i.e. simultaneously about the two non-parallel tilting axes, the pressure contact between skin and shaving surface is kept very evenly distributed over the shaving surface. At the same time, thanks to the anti-floating function, the shaving surface is kept in contact, under firm pressure, with the skin during the continuously and automatically adapting orientations. In this respect it is noted that, with a view to enhancing orientation adaptability of the external cutting member to the three-dimensionally curved skin surface, floating may in principle be seen as an additional dimension. However, in combination with the recited tiltability about the two non-parallel tilting axes, floating would involve deteriorated pressure contact levels with the skin during the continuously and automatically adapting orientations. For these reasons, the combination of the secondary tilting function and the anti-floating function provides very evenly distributed and firm skin contact pressure levels, resulting in said high shaving performance. 
         [0028]    Despite the fact that realizing a high shaving performance, generally speaking, requires more complex designs of the shaving heads, which results in more complicated cleaning of the shaving heads (especially of their cutting units), the shaving head according to the present invention is easy to clean. This is achieved thanks to the specific multi-purpose character of the multi-purpose retainer used in the present invention, which multi-purpose character includes said locking function of the retainer. 
         [0029]    For example, if a user wants to clean the shaving head after shaving, he could for example open the shaving head so as to gain access to a multi-purpose retainer of an assembled cutting unit of the shaving head. In this opened condition of the shaving head, the multi-purpose retainer, being in its locked condition then, prevents that parts of the cutting unit, such as the internal cutting member and the external cutting member, accidentally fall out of the opened shaving head. Next, by simply unlocking the multi-purpose retainer, the secondary tilting function and the anti-floating function are automatically de-activated and the cutting unit may be disassembled for separate and effective cleaning of for example the internal cutting member and the external cutting member. After cleaning, the cutting unit may be reassembled again and locked by simply locking the multi-purpose retainer, which at the same time automatically re-activates the secondary tilting function and the anti-floating function. The shaving head can then be closed again. 
       I.A. Dual-Tilt-Following Retainer Embodiment 
       [0030]    A preferred embodiment of the invention, hereinafter referred to as “Dual-Tilt-Following Retainer Embodiment”, is characterized in that, in said assembled condition of the cutting unit, in which the retainer is in its locked condition, the retainer simultaneously follows:
       the tilting movement of the skin supporting tilting member relative to the shaving head main body in said first tiltable manner about said first tilting axis; and   the tilting movement of the external cutting member relative to the ring-like skin supporting tilting member in said second tiltable manner about said second tilting axis.       
 
         [0033]    Consequently, according to this Dual-Tilt-Following Retainer Embodiment, the retainer follows both of said two tilting movements of the external cutting member. This results in a compact design of the cutting unit. 
       I.A.(i) Snap Connection Secondary Tilt Embodiment 
       [0034]    In a preferred embodiment of said Dual-Tilt-Following Retainer Embodiment, hereinafter referred to as “Snap Connection Secondary Tilt Embodiment”, said two opposed second suspension parts of the ring-like skin-supporting tilting member comprise a first snap connection structure co-operating with a second snap connection structure of the retainer, wherein said locked condition of the retainer in said assembled condition of the cutting unit is provided by a snap connection between the first snap connection structure and the second snap connection structure. The application of said snap connection structures, which enable tilting about the second tilting axis, further promotes a compact design of the cutting unit, keeps the number of separate parts of the cutting unit low, and makes assembling and disassembling of the cutting unit user-friendly. 
       I.A.(ii) Additional Tilting Ring Embodiment 
       [0035]    In another preferred embodiment of the abovementioned Dual-Tilt-Following Retainer Embodiment, hereinafter referred to as “Additional Tilting Ring Embodiment”, the cutting unit further comprises a ring-like additional tilting member, wherein, as seen in the assembled condition of the cutting unit:
       the ring-like additional tilting member is assembled together with the ring-like skin-supporting tilting member, the external cutting member, the internal cutting member and the retainer;   said ring-like additional tilting member is suspended relative to the ring-like skin-supporting tilting member in said second tiltable manner via said two opposed second suspension parts of the ring-like skin-supporting tilting member; and   said ring-like additional tilting member comprises a third snap connection structure co-operating with a fourth snap connection structure of the retainer, wherein said locked condition of the retainer in said assembled condition of the cutting unit is provided by a snap connection between the third snap connection structure and the fourth snap connection structure.       
 
         [0039]    The application of said ring-like additional tilting member allows the second tilting axis to be brought closer to skin level, which improves the behaviour of the external cutting member to continuously and automatically adapt its orientation within the shaving head when a user moves the shaving head along a three-dimensionally curved skin surface, while the application of said snap connection structures for connection between the ring-like additional tilting member and the retainer further promotes a compact design of the cutting unit, keeps the number of separate parts of the cutting unit low, and makes assembling and disassembling of the cutting unit user-friendly. 
         [0040]    A preferred embodiment of the abovementioned Additional Tilting Ring Embodiment is characterized in that, as seen in the assembled condition of the cutting unit, the ring-like additional tilting member is prevented from contacting skin during the said shaving action. In other words, unlike the ring-like skin-supporting tilting member, the ring-like additional tilting member does not have a skin-supporting surface. This means that the ring-like additional tilting member does not require any space for accommodating the skin-supporting surface. Hence, within the skin-contacting surface of the cutting unit, there is no need to sacrifice part of the surface area of the skin-shaving surface for the benefit of the skin-supporting surface of the ring-like additional tilting member. This improves the shaving performance. 
       I.B. Single-Tilt-Following Retainer Embodiment 
       [0041]    Another preferred embodiment of the invention, hereinafter referred to as “Single-Tilt-Following Retainer Embodiment”, is characterized in that, in said assembled condition of the cutting unit, in which the retainer is in its locked condition, the retainer follows the tilting movement of the skin-supporting tilting member relative to the shaving head main body in said first tiltable manner about said first tilting axis, but the retainer does not follow the tilting movement of the external cutting member relative to the ring-like skin-supporting tilting member in said second tiltable manner about said second tilting axis. Since in this Single-Tilt-Following Retainer Embodiment the retainer does not follow the tilting movement of the external cutting member relative to the ring-like skin-supporting tilting member in said second tiltable manner about said second tilting axis, the retainer, and the way in which it is fitted within the cutting unit, can be designed in more simple, robust and reliable ways, which has a positive influence on the user-friendliness and lifespan of the retainer and the cutting unit. 
         [0042]    A preferred embodiment of the abovementioned Single-Tilt-Following Retainer Embodiment is characterized in that: 
         [0043]    the ring-like skin-supporting tilting member comprises a first interlocking structure and the retainer comprises a second interlocking structure, said first interlocking structure co-operating with said second interlocking structure for realizing said locked condition of the retainer in said assembled condition of the cutting unit; 
         [0044]    the two second suspension parts of the ring-like skin-supporting tilting member comprise two first abutment parts, respectively; 
         [0045]    wherein, as seen in said locked condition of the retainer in said assembled condition of the cutting unit: 
         [0046]    the retainer comprises two second abutment parts, which are opposite to the two first abutment parts, respectively, with a first part of the external cutting member lying in-between one first abutment part and one second abutment part, opposite to said one first abutment part, and with a second part of the external cutting member lying in-between the other first abutment part and the other second abutment part; and 
         [0047]    said second tilting axis passes through said first part of the external cutting member and through said second part of the external cutting member, while abutment action of the first abutment parts and of the second abutment parts disables translation of the external cutting member in a direction transverse to said second tilting axis. 
         [0048]    The realization of the Single-Tilt-Following Retainer Embodiment by means of said first abutment parts of the ring-like skin supporting tilting member and the second abutment parts of the retainer further results in improved simplicity, robustness and reliability of the retainer and the cutting unit. 
         [0049]    As mentioned hereinbefore, for a shaving head according to the invention, the second tilting axis extends at a non-zero angle relative to the first tilting axis. In other words, the second tilting axis is not parallel to the first tilting axis. 
         [0050]    In another preferred embodiment of the invention, which embodiment can be used in combination with any one of the abovementioned embodiments of the invention, the first tilting axis and the second tilting axis extend perpendicularly relative to one another. Such a perpendicular arrangement (i.e. there is a 90 degrees angle between first tilting axis and second tilting axis) in many shaving head arrangements is considered to result in the most preferable adaptation behaviour of the orientation of the skin-shaving surface of the external cutting member during shaving. However, other non-zero angles between first tilting axis and second tilting axis will work as well, although in many shaving head arrangements said adaptation behaviour will improve most if said non-zero angle is closer to  90  degrees according to said perpendicular arrangement. 
         [0051]    As mentioned hereinbefore, for a shaving head according to the invention, the internal cutting member is drivable for movement along said opening structure in the skin shaving surface of the external cutting member, for cutting through hairs passing said opening structure. In principle, said movement of the drivable internal cutting member may comprise movements of various nature, such as reciprocating translative movement, (reciprocating and/or continuous) rotative movement, or a combination of reciprocating translative movement and (reciprocating and/or continuous) rotative movement. 
         [0052]    In another preferred embodiment of the invention, which embodiment can be used in combination with any one of the abovementioned embodiments of the invention, said movement of the drivable internal cutting member comprises rotative movement about a rotation axis which is perpendicular to both the first tilting axis and the second tilting axis. The combination of twofold tiltability about the first and second tilting axes along with the driven rotative movement about an axis of rotation perpendicular to both these tilting axes allows achieving compact skin-contacting surfaces of the cutting unit, which at the same time provide highly effective shaving performances. 
         [0053]    The invention may also be embodied in a shaving device for skin hairs, comprising: 
         [0054]    a shaving-device main body which is intended to be taken hold of by a user of the shaving device, and which serves for accommodating various members of the shaving device; and 
         [0055]    a shaving head according to any one of the abovementioned embodiments of the invention, the shaving head being connected or connectable to the shaving-device main body for operation of the shaving device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0056]    The abovementioned aspects and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter by way of non-limiting examples only and with reference to the schematic figures in the enclosed drawing. 
           [0057]      FIG. 1  shows, in a perspective view, an example of a shaving device according to the invention, which shaving device comprises an example of an embodiment of a shaving head according to the abovementioned Multi-Purpose Retainer Principle. More in particular, the shaving head of  FIG. 1  is an example of the abovementioned Dual-Tilt-Following Retainer Embodiment. Still more in particular, the shaving head of  FIG. 1  is an example of the abovementioned Snap Connection Secondary Tilt Embodiment. 
           [0058]      FIG. 2  separately shows, in a perspective view, the shaving head of  FIG. 1  again, however, this time in an opened condition of the shaving head. 
           [0059]      FIG. 3  separately shows, in a perspective view, one of the three identical cutting units of the shaving head of  FIG. 2 , in disassembled condition of the cutting unit shown. 
           [0060]      FIG. 4  shows the same situation as  FIG. 3 , however, the perspective view is taken in a different perspective direction. 
           [0061]      FIG. 5A  shows, in a perspective view, the cutting unit of  FIG. 3 , however, this time in assembled condition of the cutting unit. 
           [0062]      FIG. 5B  again shows the assembled cutting unit of  FIG. 3 , however, this time in a first side view, which corresponds to a view in a direction parallel to the first tilting axis of the cutting unit shown. 
           [0063]      FIG. 5C  again shows the assembled cutting unit of  FIG. 3 , however, this time in a second side view, which corresponds to a view in a direction parallel to the second tilting axis of the cutting unit shown. 
           [0064]      FIG. 5D  again shows the situation of  FIG. 5C , however, this time after, starting from the situation of  FIG. 5C , the external cutting member has been tilted clockwise through a few degrees about the second tilting axis and relative to the ring-like skin supporting tilting member. 
           [0065]      FIG. 5E  also shows the situation of  FIG. 5D , however, this time after said tilting through a few degrees has been performed in anti-clockwise direction. 
           [0066]      FIG. 6  again shows the situation of  FIG. 2 , however, the shaving head of  FIG. 6  differs from the shaving head of  FIG. 2 , the difference only being that the shaving head of  FIG. 6  has three identical cutting units, which are different from the three identical cutting units of the shaving head of  FIG. 2 . The shaving head of  FIG. 6  also is an example of an embodiment of a shaving head according to the abovementioned Multi-Purpose Retainer Principle. In that sense, the shaving device of  FIG. 1  remains a shaving device according to the invention if it contains the shaving head of  FIG. 6  instead of the shaving head of  FIG. 2 . Just like the shaving head of  FIG. 2 , the shaving head of  FIG. 6  is an example of the abovementioned Dual-Tilt-Following Retainer Embodiment. However, the shaving head of 
           [0067]      FIG. 6  is not an example of the abovementioned Snap Connection Secondary Tilt Embodiment. Instead, the shaving head of  FIG. 6  is an example of the abovementioned Additional Tilting Ring Embodiment. 
           [0068]      FIG. 7  separately shows, in a perspective view, one of the three identical cutting units of the shaving head of  FIG. 6 , in disassembled condition of the cutting unit shown. 
           [0069]      FIG. 8A  shows, in a perspective view, the cutting unit of  FIG. 7 , however, this time in assembled condition of the cutting unit. 
           [0070]      FIG. 8B  again shows the assembled cutting unit of  FIG. 7 , however, this time in a first side view, which corresponds to a view in a direction parallel to the first tilting axis of the cutting unit shown. 
           [0071]      FIG. 8C  again shows the assembled cutting unit of  FIG. 7 , however, this time in a second side view, which corresponds to a view in a direction parallel to the second tilting axis of the cutting unit shown. 
           [0072]      FIG. 8D  again shows the situation of  FIG. 8C , however, this time after, starting from the situation of  FIG. 8C , the external cutting member has been tilted clockwise through a few degrees about the second tilting axis and relative to the ring-like skin-supporting tilting member. 
           [0073]      FIG. 8E  again shows the situation of  FIG. 8D , however, this time after said tilting through a few degrees has been performed in anti-clockwise direction. 
           [0074]      FIG. 9  shows, in a perspective view, a situation similar to that of  FIG. 3 , however, the cutting unit of  FIG. 9  differs from that of  FIG. 3  in that the cutting unit of  FIG. 9  is an example of an embodiment of a cutting unit of a shaving head of the abovementioned Single-Tilt-Following Retainer Embodiment. 
           [0075]      FIG. 10  shows the same situation as  FIG. 9 , however, the perspective view is taken in a different perspective direction. 
           [0076]      FIG. 11A  shows, in a plan view, an example of an embodiment of a shaving head of the abovementioned Single-Tilt-Following Retainer Embodiment, wherein the shaving head of  FIG. 11A  has two cutting units, each one being identical to the cutting unit shown in  FIGS. 9 and 10 . 
           [0077]      FIG. 11B  shows, in assembled condition, one of the two identical cutting units of  FIG. 11A  in a transverse cross-sectional view, taken along the plane indicated by arrows XI-B in  FIG. 11A , wherein said plane is viewed in the direction of said arrows XI-B, wherein said transverse cross-sectional view, which corresponds to a view in a direction parallel to the second tilting axis of the shown cutting unit, is partly a ghost view. 
           [0078]      FIG. 12A  shows the assembled condition of  FIG. 11B  again, however, this time after, starting from the situation of  FIG. 11B , the external cutting member has been tilted clockwise through a few degrees about the second tilting axis and relative to the ring-like skin supporting tilting member. 
           [0079]      FIG. 12B  also shows the situation of  FIG. 11B , however, this time after said tilting through a few degrees has been performed in anti-clockwise direction. 
       
    
    
       [0080]    It is noted that when the same reference signs are used throughout different figures of the abovementioned  FIGS. 1-12B , these reference signs denote the same or similar parts or aspects. 
       DETAILED DESCRIPTION OF EMBODIMENTS 
       [0081]    Reference is first made to  FIGS. 1, 2, 3, 4, 5A-5E , which illustrate a shaving head  3  according to the abovementioned Multi-Purpose Retainer Principle, more in particular according to the abovementioned Dual-Tilt-Following Retainer Embodiment, still more in particular according to the abovementioned Snap Connection Secondary Tilt Embodiment. 
         [0082]      FIG. 1  shows the shaving device  1 , which comprises the shaving-device main body  2  and the shaving head  3  being connected thereto, while  FIG. 2  shows that the shaving head  3  can be taken apart into the two parts  4  and  5  shown. Part  5  has a frame  8  to which the three identical cutting units  7 ,  7 A,  7 B of the shaving head  3  have been connected. Part  4  has three driving shafts  6 ,  6 A,  6 B for driving the three internal cutting members  73  of the three cutting units  7 ,  7 A,  7 B, respectively. Part  4  and frame  8  of part  5  jointly constitute the shaving head main body, which carries the three cutting units  7 ,  7 A,  7 B. 
         [0083]    The ring-like skin-supporting tilting member, the external cutting member, the internal cutting member, and the retainer of the cutting unit  7  are indicated by the reference numerals  71 ,  72 ,  73  and  74 , respectively (best seen in  FIGS. 3 and 4 ). 
         [0084]    The two opposed first suspension parts of the ring-like skin-supporting tilting member  71  are indicated by reference numeral  75 . Via these first suspension parts  75 , and by means of a snap connection, the skin-supporting tilting member  71  is suspended relative to the frame  8  (see  FIG. 2 ) in the said first tiltable manner about the first tilting axis. This tilting axis  11  has been indicated by reference numeral  11  in  FIGS. 5A and 5B . 
         [0085]    The abovementioned ring-like skin-supporting surface and skin-shaving surface are indicated by reference numerals  81  and  82 , respectively, see  FIG. 3 . Together they form the abovementioned skin contacting surface for contacting skin during a shaving action, see  FIGS. 5A and 5B . 
         [0086]      FIGS. 3 and 4  show that the retainer  74  has two opposed radially extending pin-like protrusions  77 , hereinafter referred to as the fulcrum pins  77 , while the ring-like skin supporting tilting member  71  has two opposed radially extending recesses  78 . Furthermore the retainer  74  has two opposed axially extending protrusions  76 , hereinafter referred to as the finger grip elements  76 . 
         [0087]    Starting from its disassembled condition, shown in  FIGS. 3 and 4 , the cutting unit  7  can be brought into its assembled condition, shown in  FIGS. 1, 2 , and  FIGS. 5A-5E , in the following manner. A user may insert the external cutting member  72  into the ring-like skin-supporting tilting member  71 , and the internal cutting member  73  into the external cutting member  72 , and then lock this external cutting member  72  and this internal cutting member  73  in-between the ring-like skin-supporting tilting member  71  and the retainer  74  in the following manner. The retainer  74  may first be axially translated into the ring-like skin-supporting tilting member  71  up to a point where the fulcrum pins  77  of the retainer  74  are at the same axial position as the recesses  78  of the ring-like skin-supporting tilting member  71 . Next, the user may rotate the retainer  74 , relative to the ring-like skin-supporting tilting member  71 , around the axial direction so as to obtain a snap connection of the fulcrum pins  77  in the recesses  78 . Said relative rotation of the retainer  74  is made easier thanks to the finger grip elements  76 . Disassembling the cutting unit  7  may of course be done by performing the abovementioned steps in reverse order. 
         [0088]    Thus, in the assembled condition of the cutting unit  7 , the fulcrum pins  77  are received in the recesses  78  in a pivotable manner. The result is that the external cutting member  72  is suspended relative to the ring-like skin-supporting tilting member  71  in the abovementioned second tiltable manner about a second tilting axis. This second tilting axis is indicated in  FIG. 5A  and  FIGS. 5C-5E  by reference numeral  12 . It is noted that in said assembled condition the retainer  74  prevents the external cutting member  72  from translating in a direction transverse to the second tilting axis  12 . It only allows the external cutting member  72  to tilt about the second tilting axis  12  as illustrated by  FIGS. 5D and 5E . 
         [0089]    From  FIGS. 1, 2, 3, 4, 5A-5E  it will now be clear that the retainer  74  simultaneously serves, inter alia, the multiple purposes as initially discussed herein, i.e. the “locking function”, the “secondary tilting function”, and the “anti-floating function”. In other words, the shaving head  3  is in accordance with the abovementioned Multi-Purpose Retainer Principle. In addition, it is now clear that the retainer  74  in its locked condition simultaneously follows the tilting movement of the skin-supporting tilting member  71  relative to the shaving head main body  4 ,  8  about the first tilting axis  11 , and the tilting movement of the external cutting member  72  relative to the ring-like skin-supporting tilting member  71  about the second tilting axis  12 , which makes the shaving head  3  also a shaving head according to the abovementioned Dual-Tilt-Following Retainer Embodiment. Furthermore, it has been made clear that the shaving head  3  also is a shaving head according to the abovementioned Snap Connection Secondary Tilt Embodiment. 
         [0090]    Now, reference is made to  FIGS. 6, 7, 8A-8E , which illustrate a shaving head  103  according to the abovementioned Multi-Purpose Retainer Principle, more in particular according to the abovementioned Dual-Tilt-Following Retainer Embodiment, and still more in particular according to the abovementioned Additional Tilting Ring Embodiment. 
         [0091]    The configuration of the shaving head  103  as shown in  FIG. 6  is highly similar to that of the shaving head  3  shown in  FIG. 2 . In fact, the shaving head  103  may be applied, instead of the shaving head  3 , in the shaving device  1  of  FIG. 1 . 
         [0092]      FIGS. 6, 7, 8A-8E  are highly similar to  FIGS. 2, 3, 5A-5E , respectively. In fact, the only essential difference with the embodiment of  FIGS. 2, 3, 5A-5E , is that the cutting unit  107  (which is identical to the cutting units  107 A and  107 B) of the shaving head  103  is different from the cutting unit  7  of the shaving head  3  (best seen in  FIG. 7 ). 
         [0093]    The ring-like skin-supporting tilting member, the external cutting member, the internal cutting member, and the retainer of the cutting unit  107  are indicated by the reference numerals  171 ,  172 ,  173  and  174 , respectively. 
         [0094]    The abovementioned ring-like additional tilting member of the cutting unit  107  is separately shown as part  179  in  FIG. 7 . In  FIG. 7  it can be seen that the ring-like additional tilting member  179  has two opposed radially extending pin-like protrusions  177 , hereinafter referred to as the fulcrum pins  177 , while the ring-like skin-supporting tilting member  171  has a corresponding pair of two opposed radially extending recesses  178 . In  FIG. 7  it is additionally shown that the ring-like additional tilting member  179  furthermore has two opposed radially inwardly extending protrusions  183 , hereinafter referred to as the inward protrusions  183 , while the retainer  174  has two opposed radially outwardly extending protrusions  184 , hereinafter referred to as the outward protrusions  184 . 
         [0095]    Starting from its disassembled condition, shown in  FIG. 7 , the cutting unit  107  can be brought into its assembled condition, shown in  FIG. 6  and  FIGS. 8A-8E , in the following manner. A user may first effectuate that the ring-like additional tilting member  179  is suspended relative to the ring-like skin-supporting tilting member  171  in the said second tiltable manner about the second tilting axis  12 . This is achieved by inserting the fulcrum pins  177  of the ring-like additional tilting member  179  into the recesses  178  of the ring-like skin-supporting tilting member  171 . Next, the user may insert the external cutting member  172  into the ring-like additional tilting member  179 , the internal cutting member  173  into the external cutting member  172 , and then lock this external cutting member  172  and this internal cutting member  173  in-between the ring-like additional tilting member  179  and the retainer  174  in the following manner. The retainer  174  may first be axially translated into the ring-like additional tilting member  179  up to a point where the outward protrusions  184  of the retainer  174  can be rotated, relative to the ring-like additional tilting member  179 , around the axial direction so as to obtain a snap connection of the outward protrusions  184  with the inward protrusions  183  of the ring-like additional tilting member  179 . Said relative rotation of the retainer  174  is made easier thanks to the finger grip elements  76 . Disassembling the cutting unit  107  may of course be done by performing the abovementioned steps in reverse order. 
         [0096]    Thus, in the assembled condition of the cutting unit  107 , the fulcrum pins  177  are received in the recesses  178  in a pivotable manner. The result is that the external cutting member  172  is suspended relative to the ring-like skin-supporting tilting member  171  in the abovementioned second tiltable manner about a second tilting axis. This second tilting axis is indicated in  FIGS. 8C-8E  by reference numeral  12 . It is noted that in said assembled condition the retainer  174  prevents the external cutting member  172  from translating in a direction transverse to the second tilting axis  12 . It only allows the external cutting member  72  to tilt about the second tilting axis  12  as illustrated by  FIGS. 8D and 8E . 
         [0097]    From  FIGS. 6, 7, 8A-8E  it will now be clear that the retainer  174  simultaneously serves, inter alia, the multiple purposes as initially discussed herein, i.e. the “locking function”, the “secondary tilting function”, and the “anti-floating function”. In other words, the shaving head  103  is in accordance with the abovementioned Multi-Purpose Retainer Principle. In addition, it is now clear that the retainer  174  in its locked condition simultaneously follows the tilting movement of the skin-supporting tilting member  171  relative to the shaving head main body  4 ,  8  about the first tilting axis  11 , and the tilting movement of the external cutting member  172  relative to the ring-like skin-supporting tilting member  171  about the second tilting axis  12 , which makes the shaving head  103  also a shaving head according to the abovementioned Dual-Tilt-Following Retainer Embodiment. Furthermore, it has been made clear that the shaving head  3  also is a shaving head according to the abovementioned Additional Tilting Ring Embodiment. 
         [0098]    As can best be seen in  FIG. 8A , it is noted that the ring-like additional tilting member  179  is prevented from contacting skin during a shaving action. 
         [0099]    Now, reference is made to  FIGS. 9, 10, 11A, 11B, 12A, 12B , which illustrate a shaving head  203  according to the abovementioned Multi-Purpose Retainer Principle, more in particular according to the abovementioned Single-Tilt-Following Retainer Embodiment. 
         [0100]    The configuration of the shaving head  203  as shown in  FIG. 11A  is similar to that of the shaving head  3  shown in  FIG. 2 . In fact, the shaving head  203  may be applied, instead of the shaving head  3 , in the shaving device  1  of  FIG. 1 . One difference is that the shaving head  203  has two identical cutting units, indicated by reference numerals  207  and  207 A, whereas the shaving head  3  has three identical cutting units. 
         [0101]      FIGS. 9, 10, 11B, 12A and 12B  are highly similar to  FIGS. 3, 4, 5C, 5D, 5E , respectively. 
         [0102]    In fact, the only essential difference with the embodiment of  FIGS. 1, 2, 3, 4, 5A-5E , is that the cutting unit  207  of the shaving head  203  is different from the cutting unit  7  of the shaving head  3 . 
         [0103]    The ring-like skin-supporting tilting member, the external cutting member, the internal cutting member, and the retainer of the cutting unit  207  are indicated by the reference numerals  271 ,  272 ,  273  and  274 , respectively. 
         [0104]    From  FIGS. 9 and 10  it will be appreciated that the retainer  274  has four, circumferentially spaced, radially extending protrusions  292 , hereinafter referred to as the interlocking pins  292 , while the ring-like skin-supporting tilting member  271  has four corresponding, circumferentially spaced, radially extending recesses  291 , hereinafter referred to as the interlocking recesses  292 . Furthermore, the retainer  274  has two opposed axially extending protrusions  76 , hereinafter referred to as the finger grip elements  76 . 
         [0105]    Starting from its disassembled condition, shown in  FIGS. 9 and 10 , the cutting unit  207  can be brought into its assembled condition, shown in  FIGS. 11A, 11B, 12A, 12B , in the following manner. A user may insert the external cutting member  272  into the ring-like skin-supporting tilting member  271 , the internal cutting member  273  into the external cutting member  272 , and then lock this external cutting member  272  and this internal cutting member  273  in-between the ring-like skin supporting tilting member  271  and the retainer  274  in the following manner. The retainer  274  may first be axially translated into the ring-like skin-supporting tilting member  271  up to a point where the interlocking pins  292  of the retainer  274  approximately are at the axial position of the interlocking recesses  291  of the ring-like skin-supporting tilting member  271 . Next, the user may rotate the retainer  274 , relative to the ring-like skin-supporting tilting member  271 , around the axial direction so as to obtain a firm interlocking between the interlocking pins  292  and the interlocking recesses  291 . Said relative rotation of the retainer  274  is made easier thanks to the finger grip elements  76 . Disassembling the cutting unit  7  may of course be done by performing the abovementioned steps in reverse order. 
         [0106]    From  FIGS. 9 and 10  it will furthermore be appreciated that the retainer  274  has two opposed, axially extending, first wedge-shaped parts  285  having diametrically opposed first wedge apexes, while the ring-like skin-supporting tilting member  271  has two opposed, axially extending, second wedge-shaped parts  278  having diametrically opposed second wedge apexes. In the assembled condition of the cutting unit  207 , the two respective first apexes of the two first wedge-shaped parts  285  face the two respective second apexes of the two second wedge-shaped parts  278 . In the assembled condition of the cutting unit, the shown flange  297  of the external cutting member  272 , at one location, is clamped in-between the first wedge apex of one of the two first wedge-shaped parts  285  and the second wedge apex of one of the two second wedge-shaped parts  278 , while at a diametrically opposite other location, the flange  297  is clamped in-between the first wedge apex of the other one of the two first wedge-shaped parts  285  and the second wedge apex of the other one of the two second wedge-shaped parts  278 . The result is that the external cutting member  272  is suspended relative to the ring-like skin-supporting tilting member  271  in the abovementioned second tiltable manner about a second tilting axis. This second tilting axis is indicated in  FIGS. 11A, 11B, 12A, 12B  by reference numeral  12 . It is noted that in said assembled condition the retainer  274  prevents the external cutting member  272  from translating in a direction transverse to the second tilting axis  12 . The external cutting member  272  is only allowed to tilt about the second tilting axis  12 , as illustrated by  FIGS. 12A and 12B . 
         [0107]    From  FIGS. 9, 10, 11A, 11B, 12A, 12B  it will now be clear that the retainer  274  simultaneously serves, inter alia, the multiple purposes as initially discussed herein, i.e. the “locking function”, the “secondary tilting function”, and the “anti-floating function”. In other words, the shaving head  203  is in accordance with the abovementioned Multi-Purpose Retainer Principle. In addition, it is now clear that in the assembled condition of the cutting unit  207 , the retainer  274  in its locked condition follows the tilting movement of the skin supporting tilting member  271  relative to the shaving head main body in said first tiltable manner about the first tilting axis  11 , but the retainer does not follow the tilting movement of the external cutting member  272  relative to the ring-like skin-supporting tilting member in said second tiltable manner about the second tilting axis  12 . In other words, the shaving head  203  is a shaving head according to the abovementioned Single-Tilt-Following Retainer Embodiment. 
         [0108]    It is remarked that each of the disclosed devices  7 ,  107  and  207  is an example of the abovementioned preferred embodiment of the invention, wherein the first tilting axis  11  and the second tilting axis  12  are perpendicular relative to one another. 
         [0109]    It is furthermore remarked that each of the disclosed devices  7 ,  107  and  207  is an example of the abovementioned preferred embodiment of the invention, wherein the movement of the drivable internal cutting member comprises rotative movement about a rotation axis which is perpendicular to both the first tilting axis  11  and the second tilting axis  12 . 
         [0110]    While the invention has been described and illustrated in detail in the foregoing description and in the drawing figures, such description and illustration are to be considered as exemplary and/or illustrative and not in a limiting sense; the invention is not limited to the disclosed embodiments. 
         [0111]    For example, according to the invention it is possible that the movement of the drivable internal cutting member, in addition or as an alternative to rotative movement, may also comprise reciprocative movement. 
         [0112]    Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. For the purpose of clarity and conciseness of the description, features are disclosed herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features disclosed. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.