Patent Publication Number: US-2021170614-A1

Title: Razor cartridge

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Pursuant to 35 U.S.C. § 119(a), this application claims the benefit of earlier filing date and right of priority to Korean Patent Application Number 10-2019-0164112, filed on Dec. 10, 2019, the contents of which are incorporated by reference herein in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a razor cartridge. 
     BACKGROUND 
     The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. 
     A conventional razor assembly, commonly known as a wet razor, includes a razor cartridge and a razor handle. The razor cartridge includes a blade housing, a guard portion, a cap portion, and at least one shaving blade disposed between the guard portion and the cap portion. 
     The blade housing is generally manufactured by injection molding plastic. Accordingly, when contacted by the user&#39;s skin, the conventional razor cartridge renders the blade housing to transfer the hardness of plastic to the user, resulting in a degraded shaving sensation. 
     In particular, when a user shaves an uneven area, for example, an area such as a chin, an armpit, etc., more regions of the blade housing come into contact with the user&#39;s skin, and the degradation may be worse. 
     In this regard, recent razor cartridges feature guard rubber. Made of rubber material, the guard rubber may be formed by injection molding on a plastic blade housing. 
     Since such a guard rubber is made of a rubber material having elasticity, it can stretch the user&#39;s skin more intensely. Additionally, the guard rubber has an effect of providing the user with a softer tactility compared to plastic material. 
     However, since the guard rubber is disposed on the blade housing only in a partial area in front of the shaving blade, the user when shaving is still bound to feel the hard touch of the plastic. 
     On the other hand, recent attempts are made to reduce irritation over the skin during shaving by using shaving aids such as shaving foam, shaving gel, and shaving cream. These shaving aids contain a lubricating component and may be applied to and used on the user&#39;s skin. 
     In general, a wet razor is used with moisture. This allows the shaving aid applied to the user&#39;s skin to be washed away from the razor cartridge by moisture during shaving. The moisture washes away shaving aids that are about to be used or could be reused. 
     This leads to short-lived function of the applied shaving aid or the use of an excessive amount of the shaving aid for a single shaving session. 
     SUMMARY 
     According to at least one embodiment, the present disclosure provides a razor cartridge including at least one shaving blade having a cutting edge, a blade housing configured to receive the at least one shaving blade in a longitudinal direction, and an edge portion disposed on each of both lateral sides of the blade housing and including a plurality of edge protrusions formed on a corresponding surface of each edge portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A to 1C  are front views of a razor cartridge according to at least one embodiment of the present disclosure. 
         FIG. 2  is a perspective view of the razor cartridge according to at least one embodiment of the present disclosure. 
         FIG. 3  is a side view of the razor cartridge according to at least one embodiment of the present disclosure. 
         FIG. 4  is a rear view of the razor cartridge according to at least one embodiment of the present disclosure. 
         FIG. 5  is a cross-sectional view of the razor cartridge according to at least one embodiment of the present disclosure, taken in the direction V-V′ of  FIG. 1A . 
         FIG. 6  is a cross-sectional view of the razor cartridge according to at least one embodiment of the present disclosure, taken in the direction VI-VI′ of  FIG. 1A . 
         FIG. 7  is a bottom view of the razor cartridge according to at least one embodiment of the present disclosure. 
         FIG. 8  is a cross-sectional view of the razor cartridge according to at least one embodiment of the present disclosure, taken in the direction VIII-VIII′ of  FIG. 1A . 
     
    
    
     DETAILED DESCRIPTION 
     At least one embodiment of the present disclosure seeks to provide a razor cartridge that can provide a soft, resilient touch to a user when shaving. 
     Further, the present disclosure seeks to provide a razor cartridge that can efficiently use the shaving aid applied to the user&#39;s skin. 
     Some exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings. In the following description, like reference numerals preferably designate like elements, although the elements are shown in different drawings. Further, in the following description of some embodiments, a detailed description of known functions and configurations incorporated herein will be omitted for the purpose of clarity and for brevity. 
     Additionally, alphanumeric code such as first, second, i), ii), (a), (b), etc., in numbering components are used solely for the purpose of differentiating one component from the other but not to imply or suggest the substances, the order or sequence of the components. Throughout this specification, when a part “includes” or “comprises” a component, the part is meant to further include other components, not excluding thereof unless there is a particular description contrary thereto. 
       FIGS. 1A to 1C  are front views of a razor cartridge  10  according to at least one embodiment of the present disclosure. 
     Specifically,  FIG. 1A  shows the razor cartridge  10  in front view,  FIG. 1B  showing the positions of a first region R 1  and second regions R 2  on a guard portion  140 , and  FIG. 1C  showing the positions of a third region R 3  and fourth regions R 4  on the guard portion  140 . 
       FIG. 2  is a perspective view of the razor cartridge  10  according to at least one embodiment of the present disclosure. 
       FIG. 3  is a side view of the razor cartridge  10  according to at least one embodiment of the present disclosure. 
     As shown in  FIGS. 1A, 2, and 3 , the razor cartridge  10  may include a shaving blade  110 A or at least one shaving blade  110 , a blade housing  120 , multiple clips  130 , a guard portion  140 , edge portions  150 , a cap portion  160 , and a lubricating band  170 . 
     The one or more shaving blades  110  may each have a cutting edge  112 . 
     The blade housing  120  may receive at least one shaving blade  110  in the longitudinal direction. Here, the longitudinal direction refers to the width direction of the blade housing  120 . For example, in  FIGS. 1A to 1C , the longitudinal direction is a direction parallel to the X-axis. 
     At least one shaving blade  110  as received in the blade housing  120  may be retained by the multiple clips  130 . 
     The blade housing  120  may include a discharge portion  122 . 
     The discharge portion  122  is configured to discharge the shaving aid delivered to the razor cartridge  10  over to the top side of the blade housing  120  to which the cutting edge  112  is directed. 
     Here, the shaving aid refers to various substances applied to the skin of a user to assist shaving. For example, the shaving aid may be one of shaving foam, shaving gel, and shaving cream, but the present disclosure is not limited thereto. 
     Additionally, the shaving aid may be a fluid material, but it may be other materials having fluidity. For example, the shaving aid may be a solid material in the form of a powder, or a fluid material containing a solid material. 
     In  FIGS. 1A, 2, and 3 , the shaving aid is shown to be discharged through the discharge portion  122  provided in the blade housing  120 , but the present disclosure is not limited thereto. 
     For example, the shaving aid may be discharged from a discharge unit independent of a razor (not shown) and applied to the user&#39;s skin. In this case, the blade housing  120  may include none of the discharge portion  122  and a receiving portion  124  (shown in  FIG. 4 ) for delivering the shaving aid to the discharge portion  122 . 
     The shaving aid may run along channels  144  formed in the guard portion  140  and be evenly distributed over the razor cartridge  10 . 
     The guard portion  140  may be disposed in front of at least one shaving blade  110  on the top side of the blade housing  120 . 
     Here, the front and rear of the shaving blade  110  are defined based on the shaving direction of the razor cartridge  10 . Accordingly, in  FIGS. 1A to 1C , the front and the rear of the shaving blade  110  are, respectively, in the negative Y-axis direction and the positive Y-axis direction with respect to the shaving blade  110 . 
     The guard portion  140 , when shaving, may stretch the skin before the cutting of the body hair by the shaving blade  110 . 
     This can erect the user&#39;s body hair in a direction perpendicular to the user&#39;s skin surface to facilitate the cutting of the body hair by the shaving blade  110 . 
     The guard portion  140  may include multiple guard protrusions  142  formed on one surface of the guard portion  140 . 
     The multiple guard protrusions  142  may protrude in a direction substantially perpendicular to the top side of the blade housing  120  on one surface of the guard portion  140 . For example, the multiple guard protrusions  142  may protrude in the positive Z-axis direction of  FIG. 2  on the one surface of the guard portion  140 . However, the present disclosure is not limited to this particular configuration. 
     The multiple guard protrusions  142  may be made of an elastic material, which can provide a soft, resilient touch to the user&#39;s skin. However, the present disclosure is not limited thereto, and the multiple guard protrusions  142  may be made of a material other than an elastic material. 
     The guard protrusions  142  may have a shape of a cylinder or a polygonal column, although the present disclosure is not limited thereto. For example, the guard protrusions  142  may have a shape elongated in the longitudinal or transverse direction. Alternatively, some of the guard protrusions  142  may have a shape of a pillar, while another portion thereof may have a shape elongated in the longitudinal direction or the transverse direction. 
     Here, the transverse direction may be a direction parallel to the shaving direction. For example, in  FIGS. 1A to 1C , the transverse direction is a direction parallel to the Y-axis. 
     The multiple guard protrusions  142  according to at least one embodiment may be evenly distributed and disposed on the one surface of the guard portion  140 . This allows the razor cartridge  10  according to at least one embodiment to provide a soft, resilient touch to the user&#39;s skin during shaving. 
     Additionally, the multiple guard protrusions  142  according to at least one embodiment are configured to reserve a shaving aid in the space between the multiple guard protrusions  142 . This enables the razor cartridge  10  according to at least one embodiment to provide the shaving aid to the user&#39;s skin for an extended duration. 
     Further, the guard protrusions  142  according to at least one embodiment expand the entire surface area of the guard portion  140 , thereby increasing the contact area between the guard portion  140  and the user&#39;s skin. This allows the guard portion  140  according to at least one embodiment to more effectively stretch the user&#39;s skin when shaving. 
     Additionally, the guard protrusions  142  according to at least one embodiment feature different protruding heights and different protruding lengths depending on the position where the guard protrusions  142  are disposed. 
     This enables the guard protrusions  142  to have different effects in each of the regions of the guard portion  140 . The relevant description will be detailed with reference to  FIGS. 5 to 8 . 
     In the present specification, the protruding height of protrusions  142  and  152  refers to the distance to the tip of each of the protrusions  142 ,  152  from a first virtual plane VP 1  substantially parallel to the top side of the blade housing  120 . Further, in the present specification, the protruding length of the protrusions  142  and  152  refers to the distance to the tip of each of the protrusions  142 ,  152  from the point at which each of the protrusions  142  and  152  protrudes. 
     As shown in  FIGS. 1A, 2, and 3 , the edge portion  150  may be disposed on each of both lateral sides of the blade housing  120 . 
     The edge portions  150  may each include multiple edge protrusions  152  formed on a corresponding surface of each edge portion  150 . 
     The multiple edge protrusions  152  may protrude in a direction substantially perpendicular to the top side of the blade housing  120  on the one surface of the edge portion  150 , but the present disclosure is not limited thereto. 
     The multiple edge protrusions  152  may be made of an elastic material, which allows providing a soft, resilient touch to the user&#39;s skin. However, the present disclosure is not limited to this particular configuration, and the edge protrusions  152  may be made of a material other than an elastic material. 
     The edge protrusions  152  may have a shape of a cylinder or a polygonal column, although the present disclosure is not limited thereto. For example, the edge protrusions  152  may have a shape elongated in the longitudinal or transverse direction. Alternatively, some of the edge protrusions  152  may have a shape of a pillar, while another portion thereof may have a shape elongated in the longitudinal direction or the transverse direction. 
     The multiple edge protrusions  152  may have the same shape as the multiple guard protrusions  142 , but they may have different shapes. 
     Additionally, the edge protrusions  152  may generally have a larger protruding height than the guard protrusions  142 . 
     Accordingly, the edge protrusions  152  according to at least one embodiment may have better contact with the user&#39;s skin as compared to the guard protrusions  142 . 
     Further, the multiple edge protrusions  152  may generally have a larger protruding length than the multiple guard protrusions  142 . As the protruding length of the protrusions  142  and  152  increases, the magnitude of the frictional force generated between the protrusions  142  and  152  and the user&#39;s skin may decrease. Accordingly, the edge protrusions  152  may provide a softer feeling or touch to the user&#39;s skin compared to the guard protrusions  142 . 
     Additionally, the multiple edge protrusions  152  according to at least one embodiment can reserve a shaving aid in the space therebetween. This enables the razor cartridge  10  according to at least one embodiment to provide the shaving aid at both side regions of the blade housing  120  to the user&#39;s skin for an extended duration. 
     The edge protrusions  152  according to at least one embodiment feature their arrangement on both sides of the blade housing  120 . 
     Accordingly, the razor cartridge  10  according to at least one embodiment when used for shaving an uneven area renders the edge protrusions  152  to contact a portion of the curved area and thereby effects providing a softer touch to the skin of the user and smoothing the skin in the curved area. 
     On the other hand, the edge portions  150  may each include a front corner region  12  and a rear corner region  14 . 
     The front corner region  12  may be an area in front of the edge portion  150 , and at least some of the front corner region  12  may overlap with the guard portion  140 . 
     The rear corner region  14  may be an area disposed behind the edge portion  150 . 
     Specifically, the rear corner region  14  may be placed beyond a second virtual plane VP 2  that is perpendicular to the transverse direction or the Y-axis and including the rearmost shaving blade  110 A of the one or more shaving blades  110 . 
     The multiple edge protrusions  152  may be formed in an evenly distributed arrangement from the front corner region  12  to the rear corner region  14 . Accordingly, the multiple edge protrusions  152  according to at least one embodiment may be in contact with the user&#39;s skin over a wider area. 
     On the other hand, the protruding height of the multiple edge protrusions  152  may tend to increase and then decrease back to lower values from the front corner region  12  toward the rear corner region  14 . Accordingly, the multiple edge protrusions  152  may form a convex curved profile at one end thereof. 
     The guard portion  140  and the edge portion  150  may be injection-molded on the blade housing  120 , but the present disclosure is not limited thereto. 
     The cap portion  160  may be disposed rearwardly of the at least one shaving blade  110 . The cap portion  160  may be made of rubber material to increase the user&#39;s contact with the skin, although the present disclosure is not limited thereto. 
     The lubricating band  170  may be disposed on the cap portion  160  or may be disposed adjacent thereto. The lubricating band  170  may include a lubricating material which may be applied to the user&#39;s skin when shaving. 
     The lubricating band  170  may be attached to the blade housing  120  by extrusion molding or injection molding, or it may be formed by injection molding on the blade housing  120 . However, the present disclosure is not limited to these particular methods of formation of the lubricating band  170 . 
     As shown in  FIGS. 1B and 10 , the guard portion  140  includes a first region R 1 , second regions R 2 , a third region R 3  and fourth regions R 4 . 
     The first region R 1  of the guard portion  140  may be disposed adjacent to the central region thereof, and the second regions R 2  may be disposed on both longitudinal sides of the first region R 1 . 
     The third region R 3  of the guard portion  140  may be disposed adjacent to the front area thereof, and the fourth regions R 4  may be disposed adjacent to the rear of the third region R 3 . 
     At least some of the third region R 3  and at least some of the fourth regions R 4  may overlap the first region R 1  and the second regions R 2 . 
     The first region R 1  and the second regions R 2  are named for indicating relative positions along the longitudinal direction on the guard portion  140 , and they are not necessarily limited to the particular positions in the guard portion  140 . 
     Similarly, the third region R 3  and the fourth regions R 4  are for indicating relative positions along the transverse direction on the guard portion  140 , and they are not necessarily limited to the particular positions in the guard portion  140 . 
     In  FIGS. 1A to 3 , the razor cartridge  10  according to at least one embodiment is shown to include all of the multiple guard protrusions  142  and the multiple edge protrusions  152 , although the present disclosure is not limited thereto. 
     For example, the razor cartridge  10  may include either the multiple guard protrusions  142  or the multiple edge protrusions  152 . 
     Further, in  FIGS. 1A to 3 , the razor cartridge  10  according to at least one embodiment is illustrated as having the guard portion  140  and the edge portions  150  formed with the guard protrusions  142  and the edge protrusions  152 , respectively, although the present disclosure is not limited thereto. 
     For example, the razor cartridge  10  may have a plurality of protrusions (not shown) formed on the top side of the blade housing  120  over the entire regions thereof except where the one or more shaving blades  110  are disposed. 
       FIG. 4  is a rear view of the razor cartridge  10  according to at least one embodiment of the present disclosure. 
     As shown in  FIG. 4 , the blade housing  120  may have a bottom side on which receiving portions  124  and connecting portions  126  are positioned. 
     The receiving portions  124  may receive a shaving aid delivered from an aid providing portion (not shown) disposed on a razor handle (not shown) and transfer the received shaving aid to the discharge portion  122  disposed on the top side of the blade housing  120 . 
     The connecting portions  126  may be connected to a razor handle (not shown), or they may be connected to a connector (not shown) for interconnecting the razor cartridge  10  and the razor handle. For example, the connecting portions  126  may be pivotally connected to the razor handle or the connector, although the present disclosure is not limited to such particular configurations. 
       FIG. 5  is a cross-sectional view of the razor cartridge  10  according to at least one embodiment of the present disclosure, taken in the direction V-V′ of  FIG. 1A . 
     As shown in  FIG. 5 , the multiple guard protrusions  142  may include first protrusions  142 A, second protrusions  142 B, and third protrusions  142 C in at least some of the guard portion  140 . 
     The first protrusions  142 A, the second protrusions  142 B, and the third protrusions  142 C may be disposed in the first region R 1  ( FIG. 1B ) of the guard portion  140 , which is adjacent to the central region thereof. 
     The first protrusions  142 A may have a first protruding height H 1 . 
     The second protrusions  142 B may be disposed rearwardly of the first protrusions  142 A, and the second protrusions  142 B may have a second protruding height H 2  greater than the first protruding height H 1 . 
     The third protrusions  142 C may be disposed rearwardly of the second protrusions  142 B, and the third protrusions  142 C may have a third protruding height H 3  that is greater than the second protruding height H 2 . 
     Accordingly, the multiple guard protrusions  142  may have their protruding height increased toward the rear of the guard portion  140  in the first region R 1  of the guard portion  140 . 
     Further, the slope of a first virtual line N 1  passing through one ends of the first protrusions  142 A and one ends of the second protrusions  142 B may be greater than the slope of a second virtual line N 2  passing through one ends of the second protrusions  142 B and one ends of the third protrusions  142 C. 
     In the present specification, the slope of a virtual line passing through the one ends of the two protrusions refers to an angle formed between the virtual line and the first virtual reference plane VP 1 . 
     Further, the multiple guard protrusions  142  disposed in the first region R 1  of the guard portion  140  may vary in height such that the guard protrusions  142  are higher towards the rear of the guard portion  140  at a decreasing rate of protruding height. 
     Accordingly, the guard portion  140  according to at least one embodiment can provide a smooth curved surface formed on the first region R 1  by varying the protruding height and the increase rate of the protruding height of the multiple guard protrusions  142  disposed in the first region R 1 . Accordingly, the razor cartridge  10  according to at least one embodiment of the present disclosure can provide a user-friendly soft shaving feel. 
     The first protrusions  142 A may have a first protruding length L 1 , the second protrusions  1428  may have a second protruding length L 2  that is greater than the first protruding length L 1 , and the third protrusions  142 C may have a third protruding length L 3  greater than the second protruding length L 2 . 
     The shorter the protruding length of the protrusions  142  and  152 , the greater the magnitude of the frictional force generated between the protrusions  142 ,  152  and the user&#39;s skin. Additionally, stretching of the skin by the guard portion  140  may be greatest in a front area of the first region R 1  of the guard portion  140 . 
     Accordingly, the guard portion  140  according to at least one embodiment has a relatively small protruding length of the first protrusions  142 A disposed in the front within the first region R 1  and thereby provides a more appropriate stretching effect on the skin. 
     At the same time, the guard portion  140  according to at least one embodiment has a relatively greater protruding length of the third protrusions  142 C disposed at the rear within the first region R 1 , thereby providing a soft touch effect to the user&#39;s skin. 
     The first protrusions  142 A may each include a first skin contact surface C 1  formed at one end thereof. 
     The second protrusions  1428  may each include a second skin contact surface C 2  formed at one end thereof. The second skin contact surface C 2  may have a smaller area than the first skin contact surface C 1 . 
     The third protrusions  142 C may each include a third skin contact surface C 3  formed at one end thereof. The third skin contact surface C 3  may have a smaller area than the second skin contact surface C 2 . 
     As described above, the stretching by the guard portion  140  may be greatest in front of the first region R 1  of the guard portion  140 . 
     Accordingly, the guard portion  140  according to the exemplary embodiment of the present disclosure relatively increases the skin contact surface of the first protrusions  142 A disposed in front of the first region R 1 , which can better maintain appropriate contact with the user&#39;s skin. 
     Further, an area difference between the first skin contact surface C 1  and the second skin contact surface C 2  may be greater than an area difference between the second skin contact surface C 2  and the third skin contact surface C 3 . In other words, the multiple guard protrusions  142  disposed in the first region R 1  of the guard portion  140  may vary in area such that the guard protrusions  142  are lower at a decreasing rate of skin contact surface area toward the rear of the guard portion  140 . 
     This allows the guard portion  140  according to at least one embodiment to provide the user with a softer shaving feel. 
     The first protrusions  142 A, the second protrusions  142 B, and the third protrusions  142 C may be disposed along the transverse direction within the first region R 1  of the guard portion  140 . 
     In this case, the first protrusions  142 A, the second protrusions  142 B, and the third protrusions  142 C may be arranged in alignment along the transverse direction or may be arranged out of alignment from each other along the transverse direction. 
     The first protrusions  142 A, the second protrusions  142 B, and the third protrusions  142 C are named to indicate the relative positions of the guard protrusions  142  on the first region R 1  of the guard portion  140  along the transverse direction, but they are not necessarily limited to the guard protrusions  142  at specific positions among the multiple guard protrusions  142 . 
       FIG. 6  is a cross-sectional view of the razor cartridge  10  according to at least one embodiment of the present disclosure, taken in the direction VI-VI′ of  FIG. 1A . 
     As shown in  FIG. 6 , the multiple guard protrusions  142  may include fourth protrusions  142 D and fifth protrusions  142 E in the second regions (R 2  of  FIG. 1B ) of the guard portion  140 . 
     At least some of each second region R 2  may be adjacent to one longitudinal side of the first region R 1 . Accordingly, the second regions R 2  may be disposed on both longitudinal sides of the first region R 1  on the guard portion  140 . 
     The fourth protrusions  142 D may have a fourth protruding height H 4  and a fourth protruding length L 4 . 
     The fifth protrusions  142 E may be disposed behind the fourth protrusions  142 D. The fifth protrusions  142 E may have a fifth protruding height H 5  greater than the fourth protruding height H 4 , and they may have a fifth protruding length L 5  smaller than the fourth protruding length L 4 . 
     Stretching by the guard portion  140  may be relatively small in the front areas of the second regions R 2  of the guard portion  140 . 
     Accordingly, the guard portion  140  according to the embodiment of the present disclosure has relatively increased protruding length of the fourth protrusions  142 D disposed in front of the second regions R 2 , thereby providing a soft touch effect on the user&#39;s skin by the area in front of the guard portion  140 . 
     The fourth protrusions  142 D and the fifth protrusions  142 E may be disposed along the transverse direction. In this case, the fourth protrusions  142 D and the fifth protrusions  142 E may be arranged in alignment along the transverse direction or may be arranged out of alignment from each other along the transverse direction. 
     The fourth protrusions  142 D and the fifth protrusions  142 E represent the relative positions of the guard protrusions  142  along the transverse direction on the second regions R 2  of the guard portion  140 , but they are not necessarily limited to the guard protrusions  142  at specific positions among the multiple guard protrusions  142 . 
       FIG. 7  is a bottom view of the razor cartridge  10  according to at least one embodiment of the present disclosure. 
     As shown in  FIG. 7 , the multiple guard protrusions  142  may include sixth protrusions  142 F. 
     The sixth protrusions  142 F may be disposed within the second regions R 2  to be spaced longitudinally outwardly apart from the fourth protrusions  142 D. 
     Alternatively, the first protrusions  142 A, the fourth protrusions  142 D, and the sixth protrusions  142 F may be placed in the third region R 3  ( FIG. 10 ) of the guard portion  140 . 
     The third region R 3  is one adjacent to the front of the guard portion  140 , and at least some of the third region R 3  may overlap the first region R 1  and the second region R 2 . 
     The fourth protrusions  142 D may have a fourth protruding height H 4  greater than the first protruding height H 1 , and the sixth protrusions  142 F may have a height H 6  greater than the fourth protruding height H 4 . 
     Accordingly, the multiple guard protrusions  142  in the third region R 3  of the guard portion  140  may have their protruding height increased from the center of the guard portion  140  toward the edge portions  150  disposed on both sides of the blade housing  120 . 
     Specifically, the multiple guard protrusions  142  in the third region R 3  of the guard portion  140  may have their protruding height increased from the center of the guard portion  140  toward the front corner regions  12 . 
     Additionally, the slope of a third virtual line N 3  passing through one ends of the first protrusions  142 A and one ends of the fourth protrusions  142 D may be smaller than the slope of a fourth virtual line N 4  passing through the one ends of the fourth protrusions  142 D and one ends the sixth protrusions  142 F. 
     Further, the multiple guard protrusions  142  disposed in at least a partial region of the guard portion  140  may vary in height such that the guard protrusions  142  are higher at an increasing rate of protruding height towards the front corner regions  12  or edge portions  50  from the center of the guard portion  140 . 
     Accordingly, the multiple guard protrusions  142  according to at least one embodiment may have one ends configured to have varying protruding heights and varying increase rates of protruding heights and thereby form a downwardly concave curved profile. 
     This enables the razor cartridge  10  according to at least one embodiment to naturally hug the user&#39;s skin by the third region R 3  of the guard portion  140 , thereby providing the user with a better shaving feel. 
     On the other hand, the fourth protrusions  142 D may have a fourth protruding length L 4  that is greater than the first protruding length L 1 , and the sixth protrusions  142 F may have a sixth protruding length L 6  greater than the fourth protruding length L 4 . 
     The shorter the protruding length of the protrusions  142  and  152 , the greater the magnitude of the frictional force generated between the protrusions  142 ,  152  and the user&#39;s skin. 
     Accordingly, the guard portion  140  according to at least one embodiment has a relatively small protruding length of the first protrusions  142 A disposed centrally of the third region R 3  and thereby provides a more appropriate stretching effect on the skin. 
     At the same time, the guard portion  140  according to at least one embodiment has a relatively greater protruding length of the sixth protrusions  142 F disposed at the rear within the third region R 3 , thereby providing a soft touch effect to the user&#39;s skin. 
     The first protrusions  142 A, the fourth protrusions  142 D, and the sixth protrusions  142 F may be arranged along the longitudinal direction within the third region R 3  of the guard portion  140 . 
     In this case, the first protrusions  142 A, the fourth protrusions  142 D, and the sixth protrusions  142 F may be arranged in alignment along the longitudinal direction or they may be arranged out of alignment from each other along the longitudinal direction. 
     The first protrusions  142 A, the fourth protrusions  142 D, and the sixth protrusions  142 F represent the relative positions of the guard protrusions  142  along the longitudinal direction on the third region R 3  of the guard portion  140 , but they are not necessarily limited to the guard protrusions  142  at specific positions among the multiple guard protrusions  142 . 
       FIG. 8  is a cross-sectional view of the razor cartridge  10  according to at least one embodiment of the present disclosure, taken in the direction VIII-VIII′ of  FIG. 1A . 
     As shown in  FIG. 8 , the fifth protrusions  142 E may be disposed to be spaced longitudinally outwardly apart from the third protrusions  142 C. 
     The third protrusions  142 C and the fifth protrusions  142 E may be disposed in the fourth regions R 4  ( FIG. 10 ) of the guard portion  140 . 
     The fourth regions R 4  are adjacent to the rear of the third region R 3 , and at least some of the fourth regions R 4  may overlap the first region R 1  and the second regions R 2 . 
     The difference between fifth protruding height H 5  and third protruding height H 3  may be smaller than the difference between fourth protruding height H 4  and first protruding height H 1 . 
     In other words, the multiple guard protrusions  142  that are disposed in the fourth regions R 4  may have a relatively uniform protruding height compared to the multiple guard protrusions  142  that are disposed in the third region R 3 . 
     The third protrusions  142 C and the fifth protrusions  142 E may be disposed in the fourth regions R 4  of the guard portion  140  along the longitudinal direction. 
     In this case, the third protrusions  142 C and the fifth protrusions  142 E may be arranged in alignment along the longitudinal direction or they may be arranged out of alignment from each other along the longitudinal direction. 
     The third protrusions  142 C and the fifth protrusions  142 E represent the relative positions of the guard protrusions  142  along the longitudinal direction on the fourth region R 4  of the guard portion  140 , but they are not necessarily limited to the guard protrusions  142  at specific positions among the multiple guard protrusions  142 . 
     As described above, the razor cartridge according to some embodiments of the present disclosure has an effect of providing a soft, resilient touch to the user during shaving. 
     Further, the present disclosure allows efficient use of a shaving aid. 
     Although exemplary embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions, and substitutions are possible, without departing from the idea and scope of the claimed invention. Therefore, exemplary embodiments of the present disclosure have been described for the sake of brevity and clarity. The scope of the technical idea of the present embodiments is not limited by the illustrations. Accordingly, one of ordinary skill would understand the scope of the claimed invention is not to be limited by the above explicitly described embodiments but by the claims and equivalents thereof.