Patent Publication Number: US-10766156-B2

Title: Razor cartridge assembly

Description:
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 No. 10-2017-0127831, filed on Sep. 29, 2017, the contents of which are all hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     The present disclosure relates to a razor cartridge assembly, and more particularly, to a razor cartridge assembly having a connector detachable from a razor handle and assembled to a blade housing. 
     2. Description of the Related Art 
     A conventional razor, commonly known as a wet razor, includes a blade housing and a razor handle. The blade housing generally includes one or more blades disposed between a rear side of a guard bar and a front side of a cap. The blade housing is rotatably installed on the razor handle so that it can swivel with respect to the razor handle between a neutral position and a swivel position during use of the razor. This swiveling motion may be based on a rotation axis parallel to a direction (longitudinal direction of the blade housing) in which the razor blades are disposed in the blade housing. 
     Thus, when completely rotated in the direction of a cutting surface, the blade housing is at the neutral position. The swiveling motion of the blade housing between the neutral position and the swivel position with respect to the razor handle plays an important role because it allows the blade housing and related blades to continue contacting the cutting surface during use. 
     During normal shaving, the blade housing may swivel with respect to the razor handle in the direction of the swivel position as it is moved away from the cutting surface by a certain force. The force may include a frictional force caused by the cutting surface contacting the guard bar and a force required when the blades cut hair. In order to compensate for the characteristics of a cartridge that swivels away from the cutting surface, the razor may include a biasing member such as a spring plunger. The biasing member acts to keep the blade housing in contact with the cutting surface by applying force to the blade housing in the direction of the neutral position. 
     While an end of the razor handle can be directly coupled to the back of the blade housing as described above, the blade housing and the razor handle can also be connected using a connector for secure assembly or proper swiveling motion. To provide the swiveling motion of the blade housing in a razor having the connector, blade housing may swivel with respect to the connector or the connector fixedly coupled to the blade housing may swivel on an end of the razor handle. 
     According to a configuration in which the blade housing swivels with respect to the connecter, the connector may have a side detachably coupled to the blade housing and the other side coupled to an end of the razor handle. Here, the connector does not swivel with respect to the razor handle, whereas the blade housing swivels around the rotation axis parallel to the longitudinal direction of the razor cartridge with respect to the coupling end of the connector. 
     According to a configuration in which the connector swivels on an end of the razor handle, an end (for example, a plunger guard) of the razor handle detachably coupled to the connector swivels around the rotation axis with respect to the body of the razor handle. Here, no relative movement occurs between the blade housing and the connector. 
     If the end of the razor handle detachable from the connector swivels as in the latter configuration, it is necessary to ensure that the connector is easily assembled to the blade housing and is not detached from the blade housing after assembly. However, conventional connectors are not quickly and easily assembled to the blade housing or may be detached from the blade housing by an external force applied after assembly. 
     SUMMARY 
     Aspects of the present disclosure provide a razor cartridge assembly having a connector that can be quickly and easily assembled to a blade housing. 
     Aspects of the present disclosure also provide a razor cartridge assembly in which a connector may not be separated from a blade housing even when a considerable external force is applied after the connector is assembled to the blade housing. 
     However, aspects of the present disclosure are not restricted to the one set forth herein. The above and other aspects of the present disclosure will become more apparent to one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure given below. 
     According to an aspect of the present disclosure, there is provided a razor cartridge assembly including: one or more razor blades, each having a cutting edge; a blade housing configured to accommodate the one or more razor blades in a longitudinal direction of the blade housing; and a connector configured to be coupled to a back of the blade housing, wherein the blade housing comprises a rib disposed at the back of the blade housing and positioned in a direction perpendicular to the longitudinal direction; and the connector comprises an inner cantilever and an outer cantilever opposite the inner cantilever, wherein the inner cantilever and the outer cantilever are configured to engage with the rib to couple the blade housing and the connector together. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a perspective view of a razor according to an embodiment as viewed from the back of a razor handle (where the back of a blade housing is visible); 
         FIG. 2  is a perspective view showing a razor cartridge assembly separated from the razor handle of  FIG. 1 ; 
         FIG. 3  is a plan view of the blade housing of  FIG. 2  as viewed from the front; 
         FIG. 4  is a rear view of the blade housing of  FIG. 2  as viewed from the back; 
         FIGS. 5A, 5B, and 5C  are various perspective views of the blade housing and a connector showing a positional relationship between the blade housing and the connector; 
         FIGS. 6A, 6B, 6C, and 6D  are views of a connector according to an embodiment of the present disclosure; 
         FIG. 7A  is a rear view of a razor cartridge assembly according to an embodiment; 
         FIG. 7B  is a cross-sectional view of the razor cartridge assembly of  FIG. 7A , taken along direction B-B′; 
         FIG. 7C  is a cross-sectional view of the razor cartridge assembly of  FIG. 7A , taken along direction C-C′; 
         FIG. 7D  is a cross-sectional view of the razor cartridge assembly of  FIG. 7A , taken along direction D-D′; 
         FIG. 8A  is an exploded perspective view of the razor according to an embodiment; 
         FIG. 8B  is a side view of the exploded perspective view of  FIG. 8A ; 
         FIG. 8C  is a plan view of the exploded perspective view of  FIG. 8A ; 
         FIG. 9A  is a perspective view of a cartridge mount according to an embodiment; 
         FIG. 9B  is an alternate view of the cartridge mount of  FIG. 9A ; 
         FIG. 10A  is a perspective view showing a razor cartridge assembly coupled to a cartridge mount according to an embodiment of the present disclosure; and 
         FIG. 10B  is a cross-sectional view taken along direction E-E′ of the perspective view of  FIG. 10A . 
     
    
    
     DETAILED DESCRIPTION 
     Advantages and features of the present disclosure and methods of accomplishing the same may be understood more readily by reference to the following detailed description of exemplary embodiments and the accompanying drawings. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present disclosure will only be defined by the appended claims. Like reference numerals refer to like elements throughout the specification. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a razor  100  according to an embodiment as viewed from the back of a razor handle  30  (where the back of a blade housing  10  is visible).  FIG. 2  is a perspective view showing a razor cartridge assembly  50  separated from the razor handle  30  of  FIG. 1 . 
     The razor  100  according to an embodiment includes the razor cartridge assembly  50  which includes the blade housing  10  and a connector  20  fixedly coupled to the blade housing  10  and the razor handle  30  which is detachably coupled to the razor cartridge assembly  50 . A pair of plunger guards  31  are formed at an end of the razor handle  30 . The plunger guards  31  may be inserted into or removed from a coupling space provided in the razor cartridge assembly  50 . 
     In addition, in order to remove the plunger guards  31  of the razor handle  30  from the razor cartridge assembly  50 , a slider button  37  disposed on the back of the razor handle  30  may be configured to be pushed in a particular direction, for example toward the razor cartridge assembly  50 . In response to manipulation of the slider button  37 , a plunger (not shown) under a biasing force between the pair of plunger guards  13  may protrude toward one side of the razor cartridge assembly  50 , thereby pushing the side of the razor cartridge assembly  50 . Accordingly, the plunger guards  31  may be detached from the razor cartridge assembly  50 . 
     In some embodiments, the plunger guards  31  may swivel within a predetermined angle range with respect to a rotation axis ax formed near the end of the razor handle  30 . Accordingly, when coupled to the plunger guards  31 , the razor cartridge assembly  50  may also swivel around the rotation axis ax. 
       FIG. 3  is a plan view of the blade housing  10  of  FIG. 2  as viewed from the front. 
     A razor blade  5  may have a cutting edge at one side, and the other side of the razor blade  5  may be seated in a seating slot provided in the blade housing  10 . Here, one razor blade  5  or two or more razor blades  5  may be provided, and a direction in which the razor blade (or blades)  5  is accommodated in the blade housing  10  is a longitudinal direction d perpendicular to a shaving direction. 
     A pair of clips  7   a  and  7   b  for fixing both ends of the razor blade  5  to the blade housing  10  may be provided in order to prevent the razor blade  5  from being separated from the blade housing  10 . The pair of clips  7   a  and  7   b  may cover both ends of the razor blade  5  and pass through one or more through holes formed near the ends of the blade housing  10 . In some embodiments, the pair of clips  7   a  and  7   b  may be bent toward a back  11  of the blade housing  10 .  FIG. 3  shows an embodiment in which the clips  7   a  and  7   b  are wrapped around the blade housing  10  and passed through the through holes from a front of the blade housing  10 . 
     In addition, a guard bar  1  may be provided parallel to the razor blade  5  in front of a position where the razor blade  5  is accommodated in the blade housing  10 , and a lubrication band  3  may be provided parallel to the razor blade  5  behind the above position, with respect to a shaving direction. The guard bar  1  may be configured to make a user&#39;s hair erect in a direction substantially perpendicular to the shaving direction in order to facilitate cutting of the hair by the razor blade  5 , and the lubrication band  3  may be configured to smooth the rough skin after the cutting. 
       FIG. 4  is a rear view of an embodiment of the blade housing  10  of  FIG. 2 . 
     In the embodiment, the blade housing  10  may include ribs  12   a  and  12   b  configured to support the blade housing  10  at the back  11  in a direction perpendicular to the longitudinal direction d. The ribs  12   a  and  12   b  may be structures that reinforce the blade housing  10  in a direction perpendicular to the razor blade  5 . A pair of ribs  12   a  and  12   b  may be disposed on left and right sides of the blade housing  10 , respectively. However, the present disclosure is not limited to this case, and a larger number of the ribs  12   a  and  12   b  can be provided. The ribs  12   a  and  12   b  may include guide slopes  14   a  and  14   b  for guiding the connector  20  to be fastened easily. At the back  11  of the blade housing  10 , the guide slopes  14   a  and  14   b  are angled to decline toward opposite sides of the ribs  12   a  and  12   b,  respectively. In an embodiment, a first longitudinal beam  18  may be provided between the razor blade  5  and the lubrication band  3  at the back  11  of the blade housing  10  and comprise a hook coupling portion  15  configured to be fastened to a hook (not shown) of the connector  20 . A second longitudinal beam  19  may be provided between the guard bar  1  and the razor blade  5  at the back  11  of the blade housing  10  and comprise a center bar  17  configured to be pushed in contact with the plunger (not shown) of the razor handle  30 . In some embodiments, when the center bar  17  is pushed by the plunger, it may be deformed in a direction opposite to the plunger. 
       FIGS. 5A through 5C  are perspective views of the blade housing  10  and the connector  20  showing the blade housing  10  and the connector  20  before the connector  20  is coupled to the back  11  of the blade housing  10 . When the connector  20  is coupled to the back  11  of the blade housing  10 , an inner cantilever  21   a,    21   b  and a corresponding opposing outer cantilever  22   a,    22   b  (hereinafter, each collectively referred to as inner-outer cantilevers) engage with a corresponding rib  12   a,    12   b  from both sides. A hook  23  may be provided between two inner-outer cantilever pairs at the connector  20  and be configured to be coupled to the hook coupling portion  15  provided between the ribs  12   a,    12   b  at the back  11  of the blade housing  10 . Here, the inner-outer cantilevers may engage with the ribs  12   a,    12   b  from both sides at the same time as the hook  23  engages with a step  151  (see  FIG. 7B ) formed on an inner side of the hook coupling portion  15 . Accordingly, the connector  20  and the blade housing  10  may be securely coupled to each other. 
     The engagement between the ribs  12   a  and  12   b  and the inner-outer cantilevers will now be described in more detail with reference to  FIG. 5C . In  FIG. 5C , the connector  20  and the blade housing  10  before being coupled together are shown. Here, inner snap protrusions  212   a  and  212   b  are respectively provided on outer surfaces  211   a  and  211   b  of the inner cantilevers  21   a  and  21   b  facing the outer cantilevers  22   a  and  22   b,  and outer snap protrusions  222   a  and  222   b  are respectively provided on inner surfaces  221   a  and  221   b  of the outer cantilevers  22   a  and  22   b  facing the inner cantilevers  21   a  and  21   b.  When the blade housing  10  and the connector  20  are coupled together, the inner snap protrusions  212   a  and  212   b  and the outer snap protrusions  222   a  and  222   b  are respectively engaged with corresponding insertion grooves  13   a  and  13   b  (see  FIGS. 5A and 5B ) the ribs  12   a  and  12   b,  securing the connector  20  and the blade housing  10  together. Detail will be discussed with respect to engagement between one set of inner-outer cantilevers  21   b,    22   b  and rib  12   b,  however it will be understood that the discussion may also apply to other similar aspects of the present disclosure, for example inner-outer cantilevers  21   a,    22   a  and rib  12   a.    
     In a state where the blade housing  10  and the connector  20  are aligned as shown in  FIG. 5C , the inner surface  221   b  of the outer cantilever  22   b  may substantially align with an outer surface of the rib  12   b  (denoted by line p), and an inner end of the outer snap protrusion  222   b  provided on the inner surface  221   b  of the outer cantilever  22   b  may substantially align with an upper end of the outer guide slope  14   b  formed at the front of the rib  12   b.  In some embodiments, the outer surface  211   b  of the inner cantilever  21   b  and an outer end of the inner snap protrusion  212   b  provided on the outer surface  211   b  of the outer cantilever  22   b  may be slightly displaced toward the center of the blade housing  10  (e.g., toward the hook  23 ) compared with the inner guide slope  14   b  and an inner surface of the rib  12   b  (denoted by lines r and s). Thus some clearance may be provided so that the inner-outer cantilevers  21   b  and  22   b  of the connector  20  can be smoothly engaged with the rib  12   b.  The guide slopes  14   b  may cause a gap between the inner snap protrusion  212   b  and the outer snap protrusion  222   b  to be widened to provide for insertion of the inner snap protrusion  212   b  and the outer snap protrusion  222   b  into the insertion groove  13   b.    
     In an embodiment, the inner surface  221   b  and the outer snap protrusion  222   b  of the outer cantilever  22   b  and the outer surface  211   b  and the inner snap protrusion  212   b  of the inner cantilever  21   b  may be equally displaced on both sides of the center of the rib  12   b.  In some cases, the inner end of the outer snap protrusion  222   b  and the outer end of the inner snap protrusion  212   b  may contact each other at the time of assembling the connector  20  and the blade housing  10 . 
     In some embodiments, a gap (between lines q and r) between the ends of the outer snap protrusion  222   b  and the inner snap protrusion  212   b  before assembly may be smaller than a width w of the rib  12   b  and greater than a width v (smallest distance) between the upper ends of the two guide slopes  14   b.    
     Therefore, when the inner-outer cantilevers  21   b  and  22   b  are coupled to the rib  12   b,  the gap between the inner snap protrusion  212   b  and the outer snap protrusion  222   b  is increased (in a A-A′ direction) up to a maximum of the width w of the rib  12  as the inner-outer cantilevers  21   b  and  22   b  are moved downward along the guide slopes  14   b.  Then, as the inner snap protrusion  212   b  and the outer snap protrusion  222   b  are inserted into the insertion grooves  13   b  formed on both side surfaces of the rib  12   b,  the inner snap protrusion  212   b  and the outer snap protrusion  222   b  may move toward each other such that the gap between them is reduced again. 
     Each of the inner cantilever  21   b  and the outer cantilever  22   b  may be formed to have a cantilever beam structure having an elastic restoring force to an external bending force. Alternatively, one of the inner cantilever  21   b  or the outer cantilever  22   b  may be fixed, and the other stay be formed in a cantilever beam structure. 
     In  FIG. 5C , the coupling relationship between one pair of inner-outer cantilevers  21   b  and  22   b  and the rib  12   b  has been described. As noted, the same may apply to the coupling relationship between another pair of inner-outer cantilevers, for example,  21   a  and  22   a,  and another rib, for example  12   a,  and thus a redundant description will be omitted. 
       FIGS. 6A through 6D  are views of a connector  20  according to an embodiment of the present disclosure. In particular,  FIGS. 6A and 6B  are perspective views of the connector  20  as viewed from different directions, and  FIGS. 6C and 6D  are respectively a plan view and a rear view of the connector  20 . 
     When the connector  20  and the blade housing  10  are assembled together, they are coupled such that the combinations of the inner-outer cantilevers  21   a  and  22   a  and  21   b  and  22   b  formed on the right and left sides of the connector  20  are engaged to the ribs  12   a  and  12   b  formed at the corresponding positions of the blade housing  10 . This coupling ensures secure assembly of the connector  20  and the blade housing  10  in the longitudinal direction d (see  FIG. 4 ), but may create a minute clearance in a transverse direction, which is perpendicular to the longitudinal direction d, due to an assembly tolerance. Therefore, in some embodiments, the connector  20  may further include the hook  23 , which can be coupled to the hook coupling portion  15  of the blade housing  10 . Here, an end of the hook  23  may be configured to engage with the step  151  (see  FIG. 7B ) formed on the inner side of the hook coupling portion  15 , thereby further securing the blade housing  10  and the connector  20 , and reducing any clearance between them. The hook  23  may be configured to be bent or otherwise displaced as the hook  23  contacts the hook coupling portion  15  and a shape of the hook  23  may be restored and snapped back into place when it engages with the step  151 , thereby creating a securing force. (see  FIG. 7B ). Therefore, more secure coupling between the connector  20  and the blade housing  10  can be ensured. 
     In some embodiments, the connector  20  may include a pair of projections  24   a  and  24   b  adjacent to the hook  23  and configured to guide the hook coupling portion  15  so that the hook  23  and the hook coupling portion  15  can be coupled together in position. The projections  24   a  and  24   b  may be symmetrical with respect to the hook  23 , and a guide slot  25 , which is a space in which the hook coupling portion  15  can move while being guided, may be formed between the two projections  24   a  and  24   b.    
     A clearance groove  26  is formed on an opposite side of the guide slot  25 . When the blade housing  10  and the connector  20  are assembled together, the clearance groove  26  is positioned at a predetermined clearance y (see  FIG. 7A ) from the center bar  17  of the blade housing  10 . When a plunger  36  (see  FIG. 9A ) of the razor handle  30  protrudes, the center bar  17  is pushed while being elastically deformed to some extent or otherwise displaced in a direction opposite to the plunger  36 . At this time, the clearance groove  26  provides a space into which the pushed center bar  17  can be bent. 
     Referring to  FIG. 6D , arc-shaped recesses  27  may be formed on an inner surface of the connector  20 . The profile shapes of the recesses  27  may match the contours of the pair of plunger guards  31  (see  FIG. 9A ) formed at a proximal end of the razor handle  30 . 
       FIG. 7A  is a rear view of an assembly of the connector  20  and the blade housing  10 , that is, the razor cartridge assembly  50 . 
     In a state where the blade housing  10  and the connector  20  are assembled together as described above, a fastening space  55  is formed between the blade housing  10  and the connector  20  into which the proximal end of the razor handle  30  can be inserted in a direction toward the front end of the blade housing  10 . At this time, the inner cantilevers  21   a  and  21   b  may define opposing ends of the fastening space  55  in the longitudinal direction d. In some embodiments, the fastening space  55  may be divided into two regions by the center bar  17  of the blade housing  10 , and each of the plunger guards  31  may be inserted into the two regions, respectively. 
     When the razor handle  30  is detached from the assembly  50  in this assembled state, the plunger  36  (see  FIG. 9A ) of the razor handle  30  may be moved in a forward direction, for example by the user&#39;s operation. As the plunger  36  moves in the forward direction, it pushes the center bar  17  and the pair of plunger guards  31  disengage from the fastening space  55 . During detachment, the center bar  17  pushed by the plunger  36  may be bent within the range of the predetermined clearance y. 
       FIGS. 7B through 7D  are cross-sectional views taken along directions B-B′, C-C′ and D-D′ of  FIG. 7A , respectively. 
     Referring to  FIG. 7B , the beam  18  extending in the longitudinal direction d (see  FIG. 3 ) is formed roughly between the razor blade  5  and the lubrication band  3  at the back  11  of the blade housing  10 , and the hook coupling portion  15  which can be fastened to the hook  23  of the connector  20  is provided on the back of the transverse beam  18 . When the connector  20  and the blade housing  10  are assembled together, an end of the hook  23  is coupled to the inner step  151  of the hook coupling portion  15  formed at a central portion of the blade housing  10 . Therefore, after the assembly, the hook  23  is coupled to the hook coupling portion  15 , and clearance between the hook  23  and the hook coupling portion  15  is reduced by restoration of the shape and some elasticity of the hook  23 . Thus, the connector  20  and the blade housing  10  can be securely coupled together. 
     Referring to  FIG. 7C , a cross-sectional view along direction C-C′ is shown. It will be understood that a similar and substantially symmetrical configuration is considered opposite the direction line B-B′ and thus the following discussion includes reference to pairs or corresponding elements with substantially similar configurations which may not specifically be shown in  FIG. 7C , but can be understood by those of ordinary skill when viewed in context of the other figures of this disclosure. 
     Thus in  FIG. 7C , a fastening space  55  is shown into which the pair of plunger guards  31  formed at the proximal end of the razor handle  30  can be inserted substantially from the back of the guard bar  1 . Here, a pair of engaging protrusions  16   a  and  16   b  corresponding to the pair of plunger guards  31  are provided on the left and right sides of the center bar  17 , respectively. Therefore, when the pair of plunger guards  31  are inserted into the fastening space  55 , stepped grooves  32   a  and  32   b  (see  FIG. 9B ) formed on the pair of plungers  31  are engaged with the engaging protrusions  16   a  and  16   b,  respectively. The plunger guards  31  coupled to the fastening space  55  in this way maintain the coupled state until the plunger  36  (see  FIG. 9A ) protrudes and pushes the center bar  17 . 
     Referring to  FIG. 7D , a cross-sectional view along direction D-D′ is shown.  FIG. 7D  shows a structure in which the snap protrusions  212   a  and  222   a  or  212   b  and  222   b  formed on each pair of inner-outer cantilevers  21   a  and  22   a  or  21   b  and  22   b  are coupled to the insertion grooves  13   a  or  13   b  formed in the rib  12   a  or  12   b,  respectively. At the time of assembly, since the gap between the snap protrusions  212   a  and  222   a  or  212   b  and  222   b  is smaller than the width w of the rib  12   a  or  12   b,  the inner-outer cantilevers  21   a  and  22   a  or  21   b  and  22   b  are elastically deformed to increase the gap. Then, in the assembled state, the gap between the snap protrusions  212   a  and  222   a  or  212   b  and  222   b  is reduced again when the snap protrusions  212   a  and  222   a  or  212   b  and  222   b  are snap-fit engaged with the insertion grooves  13   a  or  13   b.  Therefore, the connector  20  is not separated rearward from the blade housing  10 . 
       FIG. 8A  is an exploded perspective view of the razor  100  according to an embodiment,  FIG. 8B  is a side view of the exploded perspective view of  FIG. 8A , and  FIG. 8C  is a plan view of the exploded perspective view of  FIG. 8A . 
     After the blade housing  10  and the connector  20  are assembled into the razor cartridge assembly  50  as described above, the pair of plunger guards  31  may be detachably coupled to the fastening space  55  formed in the razor cartridge assembly  50 . The fastening space  55  may be divided into two regions by the center bar  17 , and each of the pair of plunger guards  31  may be inserted into the two regions, respectively. That is, when the pair of plunger guards  31  are inserted into the fastening space  55 , the center bar  17  occupies the space between the pair of plunger guards  31 . 
     The plunger guards  31  may be provided at a proximal end of a cartridge mount  35 . In some embodiments, the cartridge mount  35  is separately provided and configured to be engageable with a handle grip  39 . The plunger guards  31  may swivel within a predetermined angle range with respect to the rotation axis ax parallel to the longitudinal direction d of the blade housing  10 . Therefore, during shaving, the razor cartridge assembly  50  coupled to the plunger guards  31  may also be swiveled around the rotation axis ax according to the user&#39;s operation. A coupling member  33  may be formed at a distal end of the cartridge mount  35  so as to be fastened to a proximal end of the handle grip  39 . Alternatively, the cartridge mount  35  may be integrally formed with the handle grip  39  instead of being provided as a separate component. 
     The slider button  37  may be formed on a side of the cartridge mount  35 . The user may push the slider button  37  up toward the razor cartridge assembly  50 , thereby causing the plunger  36  to protrude. In other embodiments, the slider button  37  may be configured to be pushed inward or in any direction to cause the plunger  36  to protrude. Referring to  FIG. 9A , the pair of plunger guards  31  are provided at the proximal end of the cartridge mount  35 , and the plunger  36  is formed between the pair of plunger guards  31 . When there is no external force being applied, the plunger  36  is disposed at a position where it does not protrude substantially from the cartridge mount  35 . In one embodiment, when the user pushes the slider button  37  up toward the razor cartridge assembly  50 , the plunger  36  protrudes between the two plunger guards  31  toward the razor cartridge assembly  50 . The protruding plunger  36  pushes the center bar  17  (see  FIG. 5A ), thereby causing the plunger guards  31  coupled to the fastening space  55  to be detached from the razor cartridge assembly  50 . 
       FIG. 9B  is a rear view of the cartridge mount  35  of  FIG. 9A  as viewed from the front. 
     The contours of the pair of plunger guards  31  may have profiles that match the recesses  27  (see  FIG. 6D ) formed on the inner surface of the connector  20 . In addition, when the pair of plunger guards  31  are inserted into the fastening space  55 , the pair of projections  24   a  and  24   b  (see  FIG. 6 ) formed on the connector  20  serve as stoppers for the pair of plunger guards  31 . 
     When the pair of plunger guards  31  are inserted into the fastening space  55 , the stepped grooves  32   a  and  32   b  formed on the pair of plunger guards  31  are engaged with the pair of engaging protrusions  16   a  and  16   b  (see  FIG. 5B ) formed on the left and right sides of the center bar  17  at the back  11  of the blade housing  10 . After the plunger guards  31  are inserted into the fastening space  55 , the coupling between the razor cartridge assembly  50  and the razor handle  30  may be stably maintained. The razor handle  30  may be decoupled from the razor cartridge assembly  50  when the plunger  36  is made to push the center bar  17  by the user&#39;s operation. 
       FIG. 10A  is a perspective view showing a state where the razor cartridge assembly  50  is coupled to the cartridge mount  35 .  FIG. 10B  is a cross-sectional view taken along direction E-E′ of  FIG. 10A . In  FIG. 10A , the pair of plunger guards  31  are inserted into the fastening space  55  of the razor cartridge assembly  50 , and the plunger  36  is not protruding from the cartridge mount as the slider button  37  has not been operated. In some embodiments, the plunger  36  and the slider button  37  may be integrally formed and are subjected to a biasing force f toward an initial position by a biasing member, for example, a coil spring  34 , (see  FIG. 10B ). At the initial position, the slider button  37  may be positioned away from the razor cartridge assembly  50  due to the biasing force f of the coil spring  34 . Therefore, the plunger  36  is not externally exposed and does not contact the center bar  17  of the blade housing  10 , even when the plunger guards  31  swivel. If the user causes the slider button  37  to be moved upward against the biasing force f, the plunger  36  may be moved to push the center bar  17 , causing the plunger guards  31  to be detached from the fastening space  55 . Ultimately, the razor cartridge assembly  50  is separated from the cartridge mount  35  or the razor handle  30 . 
     According to a razor cartridge assembly of the present disclosure, inner and outer cantilevers are provided which are configured to engage with corresponding ribs formed on the back of a blade housing, providing simple and secure assembly of the razor cartridge assembly. 
     In addition, according to the razor cartridge assembly of the present disclosure, plunger guards of a razor handle can be easily coupled and decoupled to and from a fastening space formed between the blade housing and a connector. 
     It will be understood that the effects of the embodiments are not restricted to those set forth herein. The above and other effects of the embodiments will become more apparent to one of ordinary skill in the art to which the embodiments pertain by referencing the claims. 
     While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims. The exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation.