Patent Publication Number: US-2023158694-A1

Title: Razor cartridge

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. Pat. Application No. 15/983,687, filed on May 18, 2018, which is a continuation of PCT/KR2015/012523, filed Nov. 20, 2015 and is related to and claims the priority under 35 U.S.C. §119(a) to Korean Application Serial No. 10-2015-0162970, which was filed in the Korean Intellectual Property Office on Nov. 20, 2015, the entire content of which is hereby incorporated by reference. 
    
    
     FIELD 
     The present disclosure relates to a razor cartridge, and more particularly, to a razor having a plurality of razor blades for shaving a beard or mustache, and a trimmer for shaving sideburns or facial hair that has grown on a curved part of the face such as under the nose. 
     BACKGROUND 
     In recent years, there has been an increase in the provision of razor cartridges having multiple razor blades as a way to reduce skin irritation by reducing the number of times the razor blades and the skin come into contact during shaving. 
     In other words, there has been an increase in the provision of razor cartridges in which a plurality of razor blades are disposed at predetermined intervals so that, even when the number of times the razor blades come into contact with the skin is reduced, cleaner shaving is possible with the multiple razor blades. 
     However, in the case of such a razor cartridge having multiple razor blades, since a plurality of razor blades are installed at predetermined intervals, an area of the razor cartridge accommodating the multiple razor blades is inevitably widened, and thus there is a problem in that it is difficult to easily shave facial hair that has grown on a curved part of the face such as under the nose. 
     Accordingly, in recent years, there has been an increase in the supply of razor cartridges having a trimmer with a separate trimming blade formed in a direction opposite that of multiple razor blades so that it is easy to shave sideburns or facial hair that has grown on a curved part of the face such as under the nose. 
     In the case of such a conventional razor cartridge having a trimmer, since the trimming blade is not stably fixed to the razor cartridge, durability is reduced, and thus the razor cartridge does not function properly in many cases, and particularly, there is a problem in that, since the thickness of a part of the razor cartridge at which the trimming blade is installed is thick, it is not easy to shave facial hair that has grown on a curved part of the face such as under the nose. 
     The present disclosure has been made in view of the above problems, and the present disclosure is directed to providing a razor cartridge with an improved structure for fixing a trimming blade so that stability is further improved, durability of the trimming blade is improved, and it is easy to shave facial hair that has grown on a curved part of the face such as under the nose. 
     The objects of the present disclosure are not limited to the above-mentioned object, and other unmentioned objects should be clearly understood by those of ordinary skill in the art from the following description. 
     Patent Literature 
     (Patent Literature 1) KR. Application Patent No. 10-2009-0024254 
     SUMMARY 
     To solve the above objects, one embodiment of the present disclosure provides a razor cartridge including a plurality of razor blades installed in one direction of a cartridge frame, and a trimmer installed in the other direction of the cartridge frame, wherein the trimmer includes a trimming blade seated in a seating groove formed in the cartridge frame, and a trimmer cap coupled to both sides of the cartridge frame so that the trimming blade is fixed. 
     The trimmer cap may be connected to the both sides of the cartridge frame by hook coupling while the trimming blade is disposed between the both sides of the cartridge frame. 
     The trimmer cap may comprise a body part seated in the seating groove of the cartridge frame while the trimming blade is disposed between the body part and the seating groove, and coupling parts respectively formed at both sides of the body part. 
     The body part and the coupling parts of the trimmer cap may be formed to be stepped so that heights of the body part and the coupling parts are different. 
     At both sides of the seating groove of the cartridge frame, a first coupling groove may be formed by a predetermined depth in a first direction, and a second coupling groove may be formed in a direction intersecting the first direction from an end of the first coupling groove, and the coupling parts of the trimmer cap may comprise a first coupling part configured to be inserted into the first coupling groove, and a second coupling part configured to be inserted into the second coupling groove. 
     The razor cartridge may further include a fixing member configured to cover upper parts of the coupling parts and fix the trimmer cap to the cartridge frame, and the fixing member may be a clip configured to surround the plurality of razor blades and the coupling parts so that the plurality of razor blades and the trimming blade are fixed to the cartridge frame. 
     A first positioning groove or a first positioning protrusion may be formed in the seating groove of the cartridge frame, a second through-hole that corresponds to the positioning groove or the positioning protrusion may be formed in the trimming blade, and a second positioning protrusion or a second positioning groove that corresponds to the first positioning groove or the first positioning protrusion may be formed at one surface of the body part of the trimmer cap. 
     At least one locking protrusion may be formed in the seating groove of the cartridge frame, a first through-hole may be formed in a position of the trimming blade corresponding to the at least one locking protrusion, and the at least one locking protrusion may pass through the first through-hole in the trimming blade for a front end of the at least one the locking protrusion to be riveted so that the trimming blade is coupled with rivets to the cartridge frame, and an accommodating space recessed by a predetermined depth may be formed in the trimmer cap for a riveted front end of the at least one locking protrusion to be accommodated therein. 
     The trimmer cap may be formed of an elastic material. 
     Combs having a predetermined height may be formed at predetermined intervals at one side of the body part of the trimmer cap, spaces may be formed between the combs. 
     Guide protrusions having a predetermined height at predetermined intervals and spacesbetween the guide protrusions may be formed at one side of the cartridge frame so that the guide protrusions and the spaces between the guide protrusions are collinear with the combs and the spaces between the combs. 
     The combs and the spaces may be formed symmetrically at both sides of the body part of the trimmer cap. 
     The razor cartridge further comprises a fixing member configured to cover upper parts of the coupling parts and fix the trimmer cap to the cartridge frame, and wherein the fixing member is a clip configured to surround the plurality of razor blades and the coupling parts so that the plurality of razor blades and the trimming blade are fixed to the cartridge frame. 
     Other specific details of the present disclosure are included in the detailed description and the drawings. 
     In a razor cartridge according to an embodiment of the present disclosure, a structure for fixing a trimming blade is improved so that safety and durability are improved, and a thickness of a part of a cartridge frame at which a trimmer is disposed can be reduced so that shaving facial hair that has grown on a curved part of the face such as under the nose is facilitated. In this way, the functionality of the razor cartridge is improved. 
     The advantageous effects according to the present disclosure are not limited to the above-mentioned advantageous effects, and various other advantageous effects are incorporated herein. 
    
    
     
       BRIEF DESCRIPTION DRAWINGS 
       While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter is regarded as forming the present disclosure, it is believed that the disclosure will be better understood from the following description taken in conjunction with the accompanying drawings. 
         FIG.  1    is an overall perspective view of a razor according to embodiments of the present disclosure. 
         FIG.  2    is an exploded perspective view illustrating a state in which a handle and a cartridge in  FIG.  1    are detached. 
         FIGS.  3  to  6    are perspective views sequentially illustrating the relationship in which a trimmer is coupled to a razor cartridge according to a first embodiment of the present disclosure. 
         FIGS.  7 A and  7 B  are perspective views of a trimmer cap coupled to the razor cartridge according to the first embodiment of the present disclosure. 
         FIG.  8    is a partial cut-away perspective view of a state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure. 
         FIG.  9    is a front view of the state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure. 
         FIG.  10    is a cross-sectional view taken along line A-A in  FIG.  9   . 
         FIG.  11    is a cross-sectional view taken along line B-B in  FIG.  9   . 
         FIG.  12    is a longitudinal cross-sectional view of the state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure. 
         FIG.  13    is a plan view illustrating a state in which, in the razor cartridge according to the first embodiment of the present disclosure, combs formed in the trimmer cap and guide protrusions formed at one side of the cartridge frame are aligned. 
         FIG.  14    is a cross-sectional view taken along line C-C in  FIG.  13   , illustrating the relationship in which an edge part of a trimming blade is placed between the combs and the guide protrusions. 
         FIG.  15    is a cross-sectional view taken along line D-D in  FIG.  13   , illustrating the relationship in which the edge part of the trimming blade is placed in spaces between the combs and spaces between the guide protrusions. 
         FIGS.  16  to  19    are perspective views sequentially illustrating the relationship in which a trimmer is coupled to a razor cartridge according to a second embodiment of the present disclosure. 
         FIG.  20    is a perspective view of a trimmer cap coupled to the razor cartridge according to the second embodiment of the present disclosure. 
         FIG.  21    is a partial cut-away perspective view of a state in which the trimmer is coupled to the razor cartridge according to the second embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Advantages and features of the present disclosure and a method of achieving the same should become clear with embodiments described in detail below with reference to the accompanying drawings. However, the present disclosure is not limited to embodiments disclosed below and is realized in various other forms. The present embodiments make the disclosure of the present disclosure complete and are provided to completely inform one of ordinary skill in the art to which the present disclosure pertains of the scope of the disclosure. The present disclosure is defined only by the scope of the claims. Like elements are denoted by like reference numerals throughout. 
     The embodiments to be described herein will be described with reference to cross-sectional views and/or schematic diagrams, which are ideal exemplary views of the present disclosure. Therefore, the forms of the exemplary views may be changed due to manufacturing techniques and/or allowable errors. In each of the drawings of the present disclosure, each element may be somewhat exaggerated or minimized in consideration of convenience of description. Like elements are denoted by like reference numerals throughout. 
     Hereinafter, exemplary embodiments of a razor according to the present disclosure will be described in detail with reference to the accompanying exemplary drawings. 
       FIG.  1    is an overall perspective view of a razor according to embodiments of the present disclosure, and  FIG.  2    is an exploded perspective view illustrating a state in which a handle and a cartridge in the razor according to the embodiments of the present disclosure are detached. 
     As illustrated in  FIGS.  1  and  2   , a razor  10  according to the embodiments of the present disclosure mainly includes a handle  20  and a razor cartridge  30 . 
     The handle  20  is formed in the shape of a long rod so that the handle  20  can be gripped by a hand of a user attempting to shave, and the razor cartridge  30  may be installed at one side of the handle  20  so that the razor cartridge  30  is able to be coupled to the handle  20 . 
     A connector  22  configured to couple the handle  20  and the razor cartridge  30  to a button which is configured to be pushed may be installed at one side of the handle  20 . 
     A plurality of razor blades  302  and a trimmer including at least one trimming blade  305  may be installed in the razor cartridge  30 . 
     First Embodiment 
       FIGS.  3  to  6    are perspective views sequentially illustrating the relationship in which a trimmer is coupled to a razor cartridge according to a first embodiment of the present disclosure.  FIG.  3    is a perspective view of a state in which a trimming blade and a trimmer cap that constitute a trimmer are detached from a cartridge frame, and  FIGS.  4 A and  4 B  are perspective views of a state in which the trimming blade is seated in the cartridge frame. 
       FIG.  5    is a perspective view of a state in which the trimming blade and the trimmer cap are coupled to the cartridge frame, and  FIG.  6    is a perspective view of a state in which a fixing member is coupled to the cartridge frame while the trimming blade and the trimmer cap are coupled to the cartridge frame. 
       FIGS.  7 A and  7 B  are perspective views of a trimmer cap coupled to the razor cartridge according to the first embodiment of the present disclosure. 
       FIG.  8    is a partial cut-away perspective view of a state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure,  FIG.  9    is a front view of the state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure,  FIG.  10    is a cross-sectional view taken along line A-A in  FIG.  9   , and  FIG.  11    is a cross-sectional view taken along line B-B in  FIG.  9   . 
       FIG.  12    is a longitudinal cross-sectional view of the state in which the trimmer is coupled to the razor cartridge according to the first embodiment of the present disclosure. 
     As illustrated in  FIGS.  3  to  6   , a razor cartridge  30  according to the first embodiment of the present disclosure may include a cartridge frame  300 , a plurality of razor blades  302  installed in one direction of the cartridge frame  300 , and a trimmer installed in the other direction opposite that of the plurality of razor blades  302 . Furthermore, the cartridge frame  300  may have a front surface  301  (see  FIG.  12   ), a rear surface  303  (see  FIG.  12   ) opposite to the front surface  301  in a height direction, a first wall  304 , a second wall  306  opposite to the first wall  304  in a lateral direction, and a pair of side walls  305 , wherein the each of the side walls  305  is extending transverse to the first walls  304  and second walls  306 . 
     The “plurality of razor blades being installed in one direction” means that the plurality of razor blades  302  are installed in the cartridge frame  300  so that edge parts of the plurality of razor blades  302  for performing general shaving are exposed at a front surface of a cartridge. 
     The “trimmer being installed in the other direction” means that the trimmer is installed in the cartridge frame  300  so that an edge part of a trimming blade  350 , which will be described below, is exposed at a rear surface of the cartridge opposite the front surface. 
     Therefore, “one direction” refers to a direction toward the front surface of the cartridge for performing general shaving, and “the other direction” refers to a direction toward the rear surface of the cartridge for performing trimming which is generally opposite the direction toward the front surface. 
     The razor cartridge  30  may further include a fixing member configured to fix the plurality of razor blades  302  and the trimming blade  350  to the cartridge frame  300 , and a clip  390  may be provided as the fixing member in the razor cartridge according to the embodiment of the present disclosure. 
     The trimmer is installed to be fixed to the cartridge frame  300 , and may include the trimming blade  350  and a trimmer cap  360  configured to cover and fix the trimming blade  350 . 
     A seating groove  310  and coupling grooves  340  and  342  may be formed in the cartridge frame  300  so that the trimming blade  350  and the trimmer cap  360  are seated to be fixed and installed. 
     Referring to  FIGS.  3  to  6   , the seating groove  310  may be formed at an upper part of one side of the cartridge frame  300  so that the trimming blade  350  and the trimmer cap  360  are seated in the seating groove  310 . 
     In the cartridge frame  300 , the seating groove  310  may be formed in a direction opposite that in which the plurality of razor blades  302  are installed. Accordingly, when edge parts of the plurality of razor blades  302  are formed at the front surface of the cartridge, the seating groove  310  of the cartridge frame  300  may be formed at the rear surface of the cartridge. 
     At least one locking protrusion  312  that protrudes forward may be formed in the seating groove  310 , and in this case, two locking protrusions  312  may be formed at each of both sides at a predetermined interval. 
     Although the case in which two locking protrusions  312  are formed at each of both sides at a predetermined interval in the seating groove  310  of the cartridge frame  300  has been illustrated as an example in the drawings related to the first embodiment of the present disclosure, the number of locking protrusions  312  is not limited thereto. 
     At least one positioning groove  320  that is recessed may be formed in the seating groove  310 . A single positioning groove  320  may be formed at a central portion of the seating groove  310 . 
     Although the case in which only one positioning groove  320  is formed at the central portion of the seating groove  310  has been illustrated as an example in the drawings related to the first embodiment of the present disclosure, the number of positioning grooves  320  and the positions thereof are not limited thereto. 
     At both ends of the seating groove  310  in the cartridge frame  300 , a first coupling groove  340  recessed to a predetermined vertical depth and a second coupling groove  342  formed to horizontally extend outward from the first coupling groove  340  may be formed. Accordingly, a jaw is formed at a boundary between the first coupling groove  340  and the second coupling groove  342 , and the coupling relationship therebetween will be described in detail below. 
     The trimming blade  350  is seated in the seating groove  310  of the cartridge frame  300  and fixed. The trimming blade  350  may be formed of an integrated cutting blade including a support part  352  that is seated in the seating groove  310  and comes into surface contact with the seating groove  310 , a bent part  354  formed to be bent from one side of the support part  352 , and an edge part  356  extending from the bent part  354  and having a cutting edge  357  formed at an end. 
     However, the trimming blade  350  is not limited to the above-described integrated cutting blade, and may have various other blade forms such as a flat blade form or a form in which a flat blade is attached to the support part  352 . 
     In the support part  352  of the trimming blade  350 , a first through-hole  358  may be formed for the locking protrusions  312 , which are formed in the seating groove  310  of the cartridge frame  300 , to pass therethrough, and a second through-hole  359  may be formed at a position corresponding to the positioning groove  320  formed in the seating groove  310  of the cartridge frame  300 . 
     A single first through-hole  358  having an elliptical shape may be formed at each of both sides in the support part  352  of the trimming blade  350 , and two locking protrusions  312  may pass through the single first through-hole  358 . 
     Therefore, the trimming blade  350  may be fixed in a state in which movement thereof is restricted in every direction by the locking protrusions  312  passing through the first through-hole  358  so that, as illustrated in  FIG.  4 A , one surface of the support part  352  of the trimming blade  350  is seated in the seating groove  310  of the cartridge frame  300  and comes into surface contact with the seating groove  310 . 
     In this state, as illustrated in  FIG.  4 B , front ends of the locking protrusions  312  are riveted so that the trimming blade  350  is prevented from deviating in the coupling direction, i.e., upward. This operational relationship will be described in detail below. 
     The trimmer cap  360  may be coupled to the cartridge frame  300  while the trimming blade  350  is disposed between the trimmer cap  360  and the cartridge frame  300 . In this case, the trimmer cap  360  may be installed to cover the trimming blade  350  so that the trimmer cap  360  protects and fixes the trimming blade  350 . 
     As illustrated in  FIGS.  3 ,  7 A, and  7 B , the trimmer cap  360  may include a body part  362  configured to cover the trimming blade  350 , and coupling parts  380  formed at both sides of the body part  362  and configured to be coupled to the cartridge frame  300  upon being inserted into each of the first coupling groove  340  and the second coupling groove  342  so that the coupling parts  380  more stably fix the trimming blade  350 . 
     The body part  362  and the coupling parts  380  may be formed with a step therebetween so that heights of the body part  362  and the coupling parts  380  are different. Preferably, the body part  362  and the coupling parts  380  may have a step therebetween so that the height of the coupling parts  380  is lower than that of the body part  362 . The coupling parts  380  may include a first coupling part  382  configured to be vertically inserted into the first coupling groove  340  of the cartridge frame  300 , and a second coupling part  384  formed to horizontally extend from an end of the first coupling part  382  and configured to be horizontally inserted into the second coupling groove  342  of the cartridge frame  300 . 
     Therefore, in the state in which the coupling parts  380  of the trimmer cap  360  are inserted into each of the coupling grooves  340  and  342  of the cartridge frame  300 , the second coupling part  384  of the coupling parts  380  may be locked by a jaw, which is the boundary between the first coupling groove  340  and the second coupling groove  342  of the cartridge frame  300 , so that the trimmer cap  360  is prevented from deviating from the cartridge frame  300  in the coupling direction. The coupling relationship thereof will be described in more detail below. 
     For reference, a distance between the coupling parts  380  formed at both sides of the trimmer cap  360  to face each other may be increased or decreased by elasticity. 
     In the body part  362  of the trimmer cap  360 , an accommodating space  364  recessed to a predetermined depth may be formed at a position corresponding to the locking protrusion  312  of the seating groove  310  and the first through-hole  358  of the trimming blade  350 , in a lower surface that directly comes into surface contact with the seating groove  310  of the cartridge frame  300  and the support part  352  of the trimming blade  350 . 
     Therefore, the thickness of the body part  362  at a part in which the accommodating space  364  is formed is smaller than the thickness of the body part  362  at a part in which the accommodating space  364  is not formed. 
     In the body part  362  of the trimmer cap  360 , a positioning protrusion  366  may be formed at a position corresponding to the positioning groove  320  formed in the seating groove  310  of the cartridge frame  300  and the second through-hole  359  of the trimming blade  350 . 
     Although the case in which, in the razor cartridge according to the first embodiment of the present disclosure, the positioning protrusion  366  is formed at the lower surface of the body part  362  of the trimmer cap  360 , and the positioning groove  320  is formed at the seating groove  310  of the cartridge frame  300  corresponding to the positioning protrusion  366  has been described above as an example, conversely, a positioning groove may be formed at the lower surface of the body part  362  of the trimmer cap  360 , and a positioning protrusion may be formed at the seating groove  310  of the cartridge frame  300  corresponding to the positioning groove. 
     Combs  368  that protrude to a predetermined height at predetermined intervals may be formed at one side of the body part  362  of the trimmer cap  360 . Accordingly, spaces  370  may be formed between the combs  368 . 
     In this case, the combs  368  may be formed in a direction in which the cutting edge  357  of the edge part  356  of the trimming blade  350  is exposed in a state in which the trimmer cap  360  is mounted on the cartridge frame  300  and fixed. 
     Particularly, in the cartridge frame  300 , guide protrusions  330  that align sideburns or facial hair so that shaving is facilitated may be formed at predetermined intervals at one surface of a part at which the trimmer is installed. In this case, the combs  368  may be formed to be aligned and collinear with the guide protrusions  330 . 
     In this case, spaces  332  having a height lower than that of the guide protrusions  330  may be formed between the guide protrusions  330  of the cartridge frame  300 , and the spaces  332  may be aligned and collinear with the spaces  370  between the combs  368 . 
     Accordingly, when a user shaves sideburns or facial hair that has grown on a curved part of the face such as under the nose, since, from the cutting edge  357  of the edge part  356  of the trimming blade  350 , a cutting edge part at positions at which the combs  368  and the guide protrusions  330  are formed is not exposed to the outside at ordinary times, safety may be significantly improved. 
     Referring to  FIG.  12   , the coupling relationship between the plurality of razor blades  302  and the trimming blade  350  may be seen. In other words, the plurality of razor blades  302  are disposed so that edge parts thereof are exposed at the front surface of the cartridge frame  300  while the trimming blade  350  is disposed so that the cutting edge  357  of the edge part  356  thereof is exposed at the rear surface of the cartridge frame  300 . 
     More specifically, the plurality of razor blades  302  are integrated cutting blades in which the support part, the bent part, and the edge part are integrally formed, and in which the support part is coupled and fixed to the cartridge frame  300  so that the support part is substantially vertical to a general shaving plane on which shaving is performed with the razor blades. 
     The trimming blade  350  is also the integrated cutting blade in which the support part  352 , the bent part  354 , and the edge part  356  are integrally formed, and in which the support part  352  is coupled and fixed to the cartridge frame  300  so that the support part  352  is substantially parallel to the general shaving plane. 
     Due to the above configuration, an acute angle may be formed between a general shaving plane defined by tangential planes of front and rear members of the plurality of razor blades  302  and a trimming plane defined by tangential planes of front and rear members of the trimming blade  350 . 
     For reference, although the case in which the plurality of razor blades  302  and the trimming blade  350  are integrated cutting blades has been described as an example, the plurality of razor blades  302  and the trimming blade  350  may also have various other blade forms such as a flat blade form or a form in which a flat blade is coupled to a support body. 
       FIG.  13    is a plan view illustrating a state in which, in the razor cartridge according to the first embodiment of the present disclosure, combs formed in the trimmer cap and guide protrusions formed at one side of the cartridge frame are aligned,  FIG.  14    is a cross-sectional view illustrating the relationship in which an edge part of a trimming blade is placed between the combs and the guide protrusions (a cross-sectional view taken along line C-C in  FIG.  13   ), and  FIG.  15    is a cross-sectional view illustrating the relationship in which the edge part of the trimming blade is placed in spaces between the combs and spaces between the guide protrusions (a cross-sectional view taken along line D-D in  FIG.  13   ). 
     Referring to  FIGS.  13  to  15   , in the razor cartridge  30 , the combs  368  formed in the trimmer cap  360  and the guide protrusions  330  formed at one side of the cartridge frame  300  protrude at a predetermined height so that the cutting edge  357  of the edge part  356  of the trimming blade  350  disposed between the combs  368  and the guide protrusions  330  may be disposed inward from a virtual first plane  400 , i.e., at a negative position. 
     In this case, the virtual first plane  400  may be a line connecting protruding surfaces of the combs  368  to protruding surfaces of the guide protrusions  330 . In other words, the first plane  400  is a virtual plane in contact with the skin in a region in which the guide protrusions  330  and the combs  368  are formed when trimming is performed. 
     A line connecting the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330  may be defined as a virtual second plane  410 . In this case, the cutting edge  357  of the edge part  356  of the trimming blade  350  may be disposed outward from the second plane  410 , i.e., at a positive position. In other words, the second plane  410  is a virtual plane in contact with the skin in a region in which the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330  are formed when trimming is performed. 
     Therefore, when a user presses the trimmer cap  360  against the user’s skin and moves the trimmer cap  360  in one direction while the skin is in contact with the virtual first plane  400  illustrated in  FIG.  14    to shave sideburns or facial hair that has grown on a curved part of the face such as under the nose using the trimmer, the sideburns or facial hair is aligned by the combs  368  of the trimmer cap  360  and the guide protrusions  330  of the cartridge frame  300 , the sideburns or facial hair is gathered in the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330 , and the sideburns or facial hair gathered as above is shaved by parts of the cutting edge  357  of the edge part  356  of the trimming blade  350  that protrudes outward from the virtual second plane  410  as illustrated in  FIG.  15   . In this way, safety may be improved. 
     Although the case in which, in the razor cartridge according to the first embodiment of the present disclosure, the cutting edge  357  of the edge part  356  of the trimming blade  350 , which is disposed between the combs  368  and the guide protrusions  330 , is disposed inward from the virtual first plane  400 , i.e. at the negative position, and the cutting edge  357  of the edge part  356  of the trimming blade  350 , which is disposed in the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330 , is disposed outward from the virtual second plane  410 , i.e., at the positive position, has been described above as an example, embodiments are not limited thereto. 
     For example, the cutting edge  357  of the edge part  356  of the trimming blade, which is disposed between the combs  368  and the guide protrusions  330 , may also be disposed on the virtual first plane  400 . 
     The cutting edge  357  of the edge part  356  of the trimming blade  350 , which is disposed in the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330 , may also be disposed on the virtual second plane  410  or disposed inward at a fine interval from the virtual second plane  410 . 
     Even when, as described above, the cutting edge  357  of the edge part  356  of the trimming blade  350 , which is disposed in the spaces  370  between the combs  368  and the spaces  332  between the guide protrusions  330 , is disposed on the virtual second plane  410  or disposed inward at a fine interval from the virtual second plane  410 , the skin is pressed such that a part of the skin on which shaving is performed is able to come into contact with the cutting edge  357  of the edge part  356  of the trimming blade  350 . In this way, shaving may be performed while safety is ensured. 
     The coupling relationship between the cartridge frame  300  configured as above and the trimming blade  350  and the trimmer cap  360  will be described with reference to  FIGS.  3  to  6   . 
     First, as illustrated in  FIG.  3   , in a state in which both the trimming blade  350  and the trimmer cap  360  are detached from the cartridge frame  300 , as illustrated in  FIG.  4 A , the trimming blade  350  is seated in the seating groove  310  of the cartridge frame  300 , and then the trimming blade  350  is fixed. 
     In other words, the support part  352  of the trimming blade  350  is seated in the seating groove  310  of the cartridge frame  300  so that the support part  352  comes into surface contact with the seating groove  310 . In this case, since the first through-hole  358  is formed at a position of the support part  352  of the trimming blade  350 , corresponding to the locking protrusion  312  formed in the seating groove  310  of the cartridge frame  300 , the locking protrusions  312  formed in the seating groove  310  of the cartridge frame  300  protrude in a state in which the locking protrusions  312  have passed through the first through-hole  358 . 
     In the above-described state in which the locking protrusions  312  protrude in the state in which the locking protrusions  312  have passed through the first through-hole  358  formed in the support part  352  of the trimming blade  350 , as illustrated in  FIG.  4 B , front ends of the protruding locking protrusions  312  are riveted so that the front ends are horizontally spread. In this way, the trimming blade  350  is coupled with rivets to the seating groove  310  of the cartridge frame  300 . 
     Accordingly, the trimming blade  350  may remain fixed without being moved in any direction by the locking protrusions  312  of the cartridge frame  300 . 
     In this state, when the trimmer cap  360  is coupled to the cartridge frame  300  as illustrated in  FIG.  5   , the trimming blade  350  may remain fixed more stably between the trimmer cap  360  and the seating groove  310  of the cartridge frame  300 . 
     When the trimmer cap  360  is coupled to the cartridge frame  300 , both coupling parts  380  of the trimmer cap  360  are inserted through the first coupling groove  340  of the cartridge frame  300 . Since the second coupling part  384  of both coupling parts  380  horizontally protrudes past the first coupling part  382 , an end of the second coupling part  384  is pushed inward after sliding along one surface of the first coupling groove  340  of the cartridge frame  300 . 
     In this case, since the trimmer cap  360  is manufactured with an elastic material as described above, the trimmer cap  360  has some degree of elasticity, and the first coupling part  382  is closed by elasticity. 
     Next, when the coupling parts  380  are inserted through the first coupling groove  340  of the cartridge frame  300  and the second coupling part  384  reaches the second coupling groove  342  of the cartridge frame  300 , the first coupling part  382  is opened as before by an elastic restoration force, and the second coupling part  384  enters the second coupling groove  342  of the cartridge frame  300 . Accordingly, the trimmer cap  360  remains longitudinally coupled to the cartridge frame  300  while the trimming blade  350  is disposed between the trimmer cap  360  and the cartridge frame  300  (see  FIGS.  10  and  11   ). 
     In other words, in a state in which the coupling parts  380  of the trimmer cap  360  are inserted into the coupling grooves  340  and  342  of the cartridge frame  300  by hook coupling, the second coupling part  384  of the coupling parts  380  is locked by the jaw, which is the boundary between the first coupling groove  340  and the second coupling groove  342  of the cartridge frame  300 , so that the trimmer cap  360  remains coupled to the cartridge frame  300  without being detached therefrom in the coupling direction. 
     In this case, since the riveted front end parts of the locking protrusions  312  are disposed in the accommodating space  364  that is recessed to a predetermined depth in a lower surface of the body part  362  of the trimmer cap  360 , the body part  362  of the cap  360  is not spaced apart from the trimming blade  350  when the body part  362  is seated in the seating groove  310  of the cartridge frame  300  while the trimming blade  350  is disposed between the body part  362  and the seating groove  310 . 
     Simultaneously, the positioning protrusion  366  formed at the lower surface of the body part  362  of the trimmer cap  360  passes through the second through-hole  359  of the trimming blade  350  and is inserted into the positioning groove  320  formed in the seating groove  310  of the cartridge frame  300  so that the positioning protrusion  366  is coupled to the positioning groove  320 . 
     Since, as described above, the coupling parts  380  of the trimmer cap  360  are coupled to the coupling grooves  340  and  342  of the cartridge frame  300  by hook coupling while the trimming blade  350  is disposed between the coupling parts  380 , and the positioning protrusion  366  of the trimmer cap  360  is inserted into the positioning groove  320  of the cartridge frame  300  so that the positioning protrusion  366  is coupled to the positioning groove  320 , a binding force between the trimmer cap  360  and the cartridge frame  300  is enhanced. 
     Therefore, the trimming blade  350  interposed between the body part  362  of the trimmer cap  360  and the seating groove  310  of the cartridge frame  300  may remain fixed more stably without being moved. 
     Since the trimming blade  350  remains stably fixed between the trimmer cap  360  and the seating groove  310  of the cartridge frame  300 , the cutting edge  357  of the edge part  356  of the trimming blade  350  is not exposed to the outside by the combs  368  and the guide protrusions  330  in a state in which a predetermined pressure is not applied to the trimmer cap  360  for shaving. Due to the trimming blade  350  remaining stably fixed, the durability of the trimming blade  350  may also be significantly improved. 
     When the trimmer cap  360  is coupled to the cartridge frame  300  with the trimming blade  350  disposed between the cartridge frame  300  and the trimmer cap  360  and the clip  390  is gripped so that the clip  390  surrounds the plurality of razor blades  302  and the coupling parts  380  of the trimmer cap  360 , the plurality of razor blades  302  and the trimming blade  350  are stably fixed and coupled to each other. 
     In this case, instead of being directly fixed by the clip  390 , the trimming blade  350  is fixed by the clip  390  surrounding front ends of the coupling parts  380  of the trimmer cap  360 . In this way, the overall length of the trimming blade  350  may be decreased. 
     In other words, since the trimming blade  350  remains fixed, without being moved, by the locking protrusion  312  of the cartridge frame  300  passing through the first through-hole  358  of the support part  352  and the positioning protrusion  366  of the trimmer cap  360  passing through the positioning groove  320  of the support part  352 , there is no need to fix both ends of the trimming blade  350  with the clip  390  as in a conventional case, and the overall length of the trimming blade  350  may be shortened. 
     When the overall length of the trimming blade  350  is decreased as described above, interference between the trimming blade  350  and the clip  390  is removed so that, as illustrated in  FIGS.  8  and  12   , a thickness of a part of the cartridge frame  300  in which the trimmer is disposed may be reduced. Accordingly, shaving facial hair that has grown on a curved part of the face such as under the nose is facilitated, and the functionality of the razor cartridge  30  may be significantly improved. 
     Although the form in which, as illustrated in  FIG.  6   , one end of the clip  390  is inserted into a through-hole formed in the cartridge frame  300 , and the other end of the clip  390  surrounds one end of the cartridge frame  300  while surrounding the front ends of the coupling parts  380  of the trimmer cap  360  has been described as an example, embodiments are not limited thereto. 
     In other words, both ends of the clip  390  may be configured to surround both sides of the cartridge frame  300 , or both ends of the clip  390  may be configured to pass through a through-hole formed in the cartridge frame  300 . 
     However, since the trimmer is disposed at a front end portion of one side at the rear surface of the cartridge frame  300 , it may be advantageous in terms of spatial efficiency for one end of the clip  390  surrounding the front ends of the coupling parts  380  of the trimmer cap  360  to be configured to surround one end at the rear surface of the cartridge frame  300 . 
     Second Embodiment 
       FIGS.  16  to  19    are perspective views sequentially illustrating the relationship in which a trimmer is coupled to a razor cartridge according to a second embodiment of the present disclosure.  FIG.  16    is a perspective view of a state in which a trimming blade and a trimmer cap constituting the trimmer are detached from a cartridge frame, and  FIG.  17    is a perspective view of a state in which the trimming blade is seated on the cartridge frame. 
       FIG.  18    is a perspective view of a state in which the trimming blade and the trimmer cap are coupled to the cartridge frame, and  FIG.  19    is a perspective view of a state in which a clip is coupled to the cartridge frame while the trimming blade and the trimmer cap are coupled to the cartridge frame. 
       FIG.  20    is a perspective view of the trimmer cap coupled to the razor cartridge according to the second embodiment of the present disclosure. 
       FIG.  21    is a partial cut-away perspective view of a state in which the trimmer is coupled to the razor cartridge according to the second embodiment of the present disclosure. 
     For reference, in describing the razor cartridge according to the second embodiment of the present disclosure, like reference numerals will be assigned to elements that are the same as those of the razor cartridge according to the first embodiment described above. 
     In comparison to the razor cartridge according to the first embodiment described above, the razor cartridge according to the second embodiment of the present disclosure has a different structure for coupling a trimming blade  350  and a trimmer cap  360  to a cartridge frame  300 . This will be described in detail below. 
     As illustrated in  FIGS.  16  to  19   , a razor cartridge  30  according to the second embodiment of the present disclosure may include the cartridge frame  300 , a plurality of razor blades  302  installed in one direction in the cartridge frame  300 , and a trimmer installed in the other direction opposite that of the plurality of razor blades  302 . 
     The razor cartridge  30  may further include a clip  390  configured to fix the plurality of razor blades  302  and the trimming blade  350  to the cartridge frame  300 . 
     The trimmer is installed to be fixed to the cartridge frame  300 , and may include the trimming blade  350  and a trimmer cap  360  configured to cover and fix the trimming blade  350 . 
     A seating groove  310  and coupling grooves  340  and  342  may be formed in the cartridge frame  300  so that the trimming blade  350  and the trimmer cap  360  are seated to be fixed and installed. 
     Referring to  FIGS.  3  to  6   , the seating groove  310  may be formed at an upper part of one side of the cartridge frame  300  so that the trimming blade  350  and the trimmer cap  360  are seated in the seating groove  310 . 
     In the cartridge frame  300 , the seating groove  310  may be formed in a direction opposite that in which the plurality of razor blades  302  are installed. Accordingly, when edge parts of the plurality of razor blades  302  are formed at the front surface of the cartridge, the seating groove  310  of the cartridge frame  300  may be formed at the rear surface of the cartridge. 
     An insertion protrusion  366   a  that protrudes forward a predetermined length may be formed at a central portion of the seating groove  310 . 
     The trimming blade  350  is seated in the seating groove  310  of the cartridge frame  300  and fixed. The trimming blade  350  may be formed of an integrated cutting blade including a support part  352  that is seated in the seating groove  310  and comes into surface contact with the seating groove  310 , a bent part  354  formed to be bent from one side of the support part  352 , and an edge part  356  extending from the bent part  354  and having a cutting edge  357  formed at an end. 
     In this case, a communication hole  359   a  may be formed in the support part  352  of the trimming blade  350  for the insertion protrusion  366   a  formed in the seating groove  310  of the cartridge frame  300  to pass therethrough. 
     The trimmer cap  360  is coupled to the cartridge frame  300  while the trimming blade  350  is disposed between the trimmer cap  360  and the cartridge frame  300 . In this case, the trimmer cap  360  may be installed to cover the trimming blade  350  so that the trimmer cap  360  protects the trimming blade  350 . 
     As illustrated in  FIGS.  16  and  20   , the trimmer cap  360  may include a body part  362  configured to cover the trimming blade  350 , and coupling parts  380  formed at both sides of the body part  362  and configured to be coupled to the cartridge frame  300  upon being inserted into each of the first coupling groove  340  and the second coupling groove  342  so that the coupling parts  380  more stably fix the trimming blade  350 . 
     At the lower surface of the body part  362  of the trimmer cap  360 , an insertion groove  230   a  may be formed at a position corresponding to the insertion protrusion  366   a  protruding from the seating groove  310  and the communication hole  359   a  formed in the trimming blade  350  (see  FIG.  21   ). 
     Combs  368  that protrude to a predetermined height at predetermined intervals may be formed at corner portions at both sides of the body part  362  of the trimmer cap  360 . Accordingly, spaces  370  may be formed between the combs  368 . 
     In other words, as illustrated in  FIG.  20   , the combs  368 , which protrude to a predetermined height at predetermined intervals, may be formed symmetrically at the corner portions at both sides of the body part  362  of the trimmer cap  360 . 
     The coupling parts  380  formed at both ends of the body part  362  may also be formed symmetrically to each other. 
     Therefore, in the razor cartridge according to the second embodiment of the present disclosure, when the trimmer cap  360  is coupled to the seating groove  310  of the cartridge frame  300 , the trimmer cap  360  may be assembled to the seating groove  310  in any direction including directions toward a front surface and a rear surface of the cartridge. 
     The trimmer cap  360  is mass-produced as a single product, the cartridge frame  300  is also mass-produced as a single product, and the trimmer cap  360  and the cartridge frame  300  are assembled to each other, and therefore when the combs  368  are formed to be symmetrical at both sides of the body part  362  of the trimmer cap  360 , the combs  368  are aligned to guide protrusions  330  of the cartridge frame  300  regardless of the direction in which the trimmer cap  360  is assembled to the cartridge frame  300  including directions toward a front surface and a rear surface of the cartridge. In this way, assemblability is improved, and thus productivity is significantly improved. 
     Since a process of shaving sideburns or facial hair that has grown on a curved part of the face by varying the extent of protrusion of a cutting edge  357  of an edge part  356  of the trimming blade  350  by the combs  368  and the guide protrusions  330 , spaces  370  between the combs  368 , and spaces  332  between the guide protrusions  330  is identical to that according to the first embodiment described above, repeated description thereof will be omitted. 
     Since, in the razor cartridge according to the second embodiment of the present disclosure, the coupling configuration between the coupling parts  380  formed at both sides of the body part  362  of the trimmer cap  360  and the coupling grooves  340  and  342  of the cartridge frame  300  and a coupling method thereof are identical to those according to the first embodiment described above, repeated description thereof will be omitted. 
     However, in the razor cartridge according to the second embodiment of the present disclosure, as described above, the insertion protrusion  366   a  is formed at the central portion of the seating groove  310  of the cartridge frame  300 , the communication hole  359   a  is formed in the trimming blade  350 , and the insertion groove  320   a  is formed in the lower surface of the body part  362  of the trimmer cap  360  so that, as the insertion protrusion  366   a  passes through the communication hole  359   a  and is inserted into the insertion groove  320   a , the cartridge frame  300  and the trimmer cap  360  may be easily assembled while the trimming blade  350  is interposed between the cartridge frame  300  and the trimmer cap  360 . 
     For reference, although the case in which, in the razor cartridge according to the second embodiment of the present disclosure, the insertion protrusion  366   a  is formed in the seating groove  310  of the cartridge frame  300 , and the insertion groove  320   a  is formed at the lower surface of the body part  362  of the trimmer cap  360  has been described above as an example, conversely, the insertion groove may be formed in the seating groove  310  of the cartridge frame  300  while the insertion protrusion is formed in the lower surface of the body part  362  of the trimmer cap  360 . 
     Although the case in which a single insertion protrusion  366   a  and a single insertion groove  320   a  are formed has been described above as an example, a plurality of insertion protrusions  366   a  and a plurality of insertion grooves  320   a  may be formed to correspond to each other at predetermined intervals. 
     Those of ordinary skill in the art to which the present disclosure pertains should understand that the present disclosure may be embodied in other specific forms without changing the technical spirit or essential features of the present disclosure. Therefore, the embodiments described above should be understood as illustrative in all aspects instead of limiting. The scope of the present disclosure is indicated by the claims below rather than by the detailed description above, and the meaning, scope, and all changes or modifications derived from concepts equivalent to the claims should be interpreted as belonging to the scope of the present disclosure.