Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/08—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/40—Details or accessories
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/40—Details or accessories
  • B26B21/52—Handles, e.g. tiltable, flexible

Definitions

• This disclosure relates to a razor that can be used for "stroking shaving,” which involves shaving hair by gently stroking the skin.
• Patent Document 1 proposes a circular razor equipped with a circular blade in a circular opening in a circular housing.
• the inner circumference of the circular blade in the circular razor forms the cutting edge, and a circular guard that is smaller than the circular blade is positioned inside it.
• the distance from the skin-contacting surface to the cutting edge is lengthened to avoid injuring the skin, it will not be possible to shave the hair closely, and if the skin-contacting surface is pressed too hard against the skin in an attempt to shave closely, there is a risk of injuring the skin.
• the first objective of this disclosure is to provide a razor that can perform a smooth shave using a blade with a straight cutting edge, without using a special circular blade.
• the second objective is to provide a razor that can further prevent damage to the skin.
• a razor comprises a plurality of blades (10) having linear cutting edges (11) for shaving, a skin-contacting surface (25) having openings (21) exposing the cutting edges of the blades and contacting the skin, and a body portion (30) that is integral with the skin-contacting surface and defines a hollow portion (33) connected to the openings, the openings being arranged in the shape of a regular polygon, and the cutting edges of the plurality of blades being arranged along each side of the regular polygon defined by the openings, so that the cutting edges of the plurality of blades are arranged facing each other in the shape of a regular polygon.
• the razor instead of using special circular blades, uses multiple blades with straight cutting edges arranged in a regular polygonal shape, allowing it to shave a wide area using a "stroke shave” technique, in which the skin-contacting surface is brought into direct contact with the skin and moved along the skin to shave. Furthermore, because multiple blades are arranged in a regular polygonal shape, shaving can be easily performed by simply moving the razor with the skin-contacting surface in contact with the skin, regardless of the orientation of the blades when shaving.
• a comb structure (315) which has multiple comb teeth (315a) that cover each of the cutting edges of multiple blades and protrude further inward into the opening than the cutting edges they cover, allowing hair to pass through the comb teeth before coming into contact with the cutting edges and being cut.
• the razor is designed to arrange multiple blades in a regular polygonal shape, allowing shaving in any direction, not only do some blades have cutting edges that are nearly perpendicular to the direction of hair movement when shaving, but there are also blades whose cutting edges face longitudinally in the direction of hair movement. However, even for blades whose cutting edges face longitudinally in the direction of hair movement, covering them with comb teeth makes it possible to shave safely.
• the spacing (I1) between the multiple comb teeth is 1.0 mm or less
• the shortest distance (L1) from the skin contact surface to the cutting edge of the blade body is 0.15 mm or more.
• the spacing between the multiple comb teeth is preferably 0.4 mm or more and 1.0 mm or less.
• the shortest distance is preferably 0.15 mm or more and 0.25 mm or less.
• the spacing between the comb teeth is set to 1.0 mm or less, skin is prevented from getting caught between the comb teeth, preventing damage to the skin by the blades. If the spacing between the comb teeth were 0.4 mm or more, a gap would be secured for hair to fit between the comb teeth. Furthermore, because the comb teeth ensure a minimum distance of 0.15 mm or more from the skin contact surface to the blade tip, the blade tip can be positioned slightly away from the skin, preventing the blade tip from coming into direct contact with the skin and further reducing the risk of skin injury. Furthermore, if the minimum distance is set to 0.25 mm or less, it is possible to cut hair as close to the root as possible.
• there are five or more blades there are five or more blades, the five or more blades are arranged in a regular polygonal shape having five or more sides, and the opening is in the shape of a regular polygonal shape having five or more sides.
• the blades are arranged in a regular pentagon or a regular polygon with more sides, it is possible to shave well regardless of the direction the hair is moving. Furthermore, if there are five blades, the blade arrangement and opening shape will be a regular pentagon, which prevents the razor from becoming too large due to the increased number of blades.
• the angle between the cutting edge of at least one of the blades and the direction of movement is 45 degrees or greater.
• one of the cutting edges of the multiple blades at an angle of 45 degrees or more relative to the direction of hair movement, it becomes possible to shave hair well.
• the blades are arranged in a regular pentagonal shape or a regular polygonal shape with more sides, one of the cutting edges of the multiple blades will always be at an angle of 45 degrees or more relative to the direction of hair movement, regardless of the direction in which the hair moves.
• the body portion has an arched cross-sectional shape and is dome-shaped with rotational symmetry about the apex of the arch.
• the razor can be used by gripping it as if enveloping the entire body, making it easy to hold and use.
• the dome shape i.e. the circular shape when viewed from above, does not limit the direction of movement of the razor depending on the shape, and it can be moved freely in any direction to shave. This also makes it possible to increase the degree of freedom in shaving. In particular, as younger people are increasingly removing unwanted hair and razors are sometimes used by minors, making the body dome-shaped makes it easy to use for younger people as well.
• the body portion is provided on the side opposite the skin-contacting surface with a grip portion (40) that protrudes from the body portion in the opposite direction and has an enlarged dimension in the planar direction of the skin-contacting surface at the tip of the protrusion.
• the razor can be held using the grip. Furthermore, by configuring the grip so that it protrudes from the body on the opposite side and the dimensions of the skin-contacting surface are enlarged at the protruding tip, the grip can be held in a way that fits snugly.
• the body is provided with a communication hole (321) that connects the hollow portion with the outside of the body.
• the body portion has an arched cross-sectional shape and is dome-shaped with the apex of the arch as its center, and multiple communication holes are formed in a row in the circumferential direction around the apex.
• the body is dome-shaped with an arched cross section, forming multiple communication holes in a row in the circumferential direction centered on the apex of the arch allows water and dirt to be discharged from any position. Furthermore, the communication holes act as a grip, improving the stability of holding the razor when shaving. In addition, the presence of the communication holes adds an accent and can also enhance the design of the razor.
• the device has a bottom (20) that forms the skin contact surface, and the body and bottom are connected to sandwich the blade body between them.
• the body has a comb structure and a pressing portion (314a) that presses the blade body more inward than the cutting edge, and a clearance is provided between the comb teeth of the comb structure and the blade body on the cutting edge side of the pressing portion of the blade body.
• the bottom has a seat (22) that contacts the blade body and sandwiches the blade body together with the pressing portion, and a flow path-forming groove (24) that surrounds the seat at a location corresponding to the periphery of the blade body, reaches the opening, and is recessed from the seat.
• a razor in an eleventh aspect of the present disclosure comprises a plurality of blades (10) having linear cutting edges (11) for shaving hair, a skin-contacting surface (25) having openings (21) exposing the cutting edges of the blades and contacting the skin, a body portion (30) integral with the skin-contacting surface and constituting a hollow portion (33) connected to the opening, and a comb structure (315) covering each of the cutting edges of the plurality of blades and having a plurality of comb teeth (315a) that protrude further inward into the opening than the covering cutting edges, so that hair passes through the comb teeth before coming into contact with the cutting edges and being cut; the openings are arranged in a polygonal shape, and the cutting edges of the plurality of blades are arranged along each side of the polygonal shape formed by the opening, so that the cutting edges of the plurality of blades are arranged facing each other in a polygonal shape.
• a razor can be created that can shave a wide area with a smooth shave.
• multiple blades are arranged in a polygonal shape, shaving can be easily performed by smoothing, regardless of the orientation of the blades when shaving.
• each of the cutting edges of the multiple blades is covered with comb teeth, shaving can be performed safely without damaging the skin.
• the razor is designed to shave in any direction by arranging multiple blades in a polygonal shape, not only do blades with cutting edges that are nearly perpendicular to the direction of hair movement when shaving, but there are also blades with cutting edges that face the longitudinal direction of the hair movement. However, even blades with cutting edges that face the longitudinal direction of the hair movement can be shaved safely by covering them with comb teeth.
• FIG. 1 is a perspective view from above of a razor according to a first embodiment of the present disclosure.
• FIG. FIG. 2 is a perspective view from below of the razor shown in FIG. 1 .
• FIG. 2 is a bottom view of the razor shown in FIG. 1 .
• FIG. 2 is an exploded view of the razor shown in FIG. 1.
• FIG. 7 is an enlarged partial cross-sectional view of the vicinity of the blade body corresponding to the line V-V in FIG. 6 .
• FIG. 6 is an enlarged partial cross-sectional view of the blade body and its vicinity corresponding to the line VI-VI in FIG.
• FIG. 2 is an enlarged view of the cutting edge of the blade body and the comb-tooth structure.
• FIG. 2 is an enlarged perspective view of the cutting edge of the blade body and the comb-tooth structure from below.
• 10 is a cross-sectional view taken along the line XI-XI in FIG. 7.
• FIG. 10 is a perspective view of a razor according to a second embodiment of the present disclosure.
• 11A and 11B are diagrams showing an example of how the razor shown in FIG. 10 is used.
• 11 is a diagram showing another example of how the razor shown in FIG. 10 is used.
• FIG. 11 is a diagram showing another example of how the razor shown in FIG. 10 is used.
• the razor 1 shown in Figures 1 to 3 is capable of shaving hair by smoothing, has a structure in which a body part 30 is connected to a base part 20 equipped with blade bodies 10, and is used, for example, for shaving body hair.
• an opening 21 is formed in the base part 20, and the opening 21 is a regular polygon.
• the blade bodies 10 are also arranged in a regular polygonal shape.
• five blade bodies 10 are provided, and the blade bodies 10 and openings 21 are arranged in a regular pentagonal shape.
• the center line of the regular polygon formed by the openings 21 and blade bodies 10 is referred to as the central axis C, and the direction around the central axis is referred to as the circumferential direction.
• Each blade body 10 has the same shape, and as shown in Figures 4 and 5, is a roughly rectangular plate with one of the long sides forming a cutting edge 11. As shown in Figures 2 and 3, the cutting edges 11 of the five blade bodies 10 are exposed from the openings 21, and are arranged facing each other in a regular polygon shape.
• An oval slot 12 with its major axis tangent to the circumferential direction is formed inside the blade body 10, and as shown in Figure 5, the bottom 20 and body 30 are attached so that an engaging protrusion 23 formed on the bottom 20 (described below) is inserted into the slot 12.
• the minor axis dimension of the slot 12 is aligned with the dimension of the engaging protrusion 23, and each blade body 10 is held without rattle between the bottom 20 and body 30.
• a protrusion 13 is formed on one end of the side of the blade body 10 opposite the cutting edge 11. Therefore, as shown in Figure 5, when placing the blade body 10 in the seat portion 22 of the bottom portion 20 (described below), the front and back of the blade body 10 can be attached correctly, and the protrusion 13 partially extends beyond the seat portion 22, making it easy to remove the blade body 10.
• the bottom 20 is a component that exposes the blade body 10 and forms the portion that comes into contact with the skin during shaving. It is, for example, constructed as a single resin molded part, and has the shape of a circular dish with an opening in the center.
• the bottom 20 has a circular shape when the razor 1 is viewed from below as shown in Figure 3, and has an opening 21, a seat 22, an engaging protrusion 23, a flow path forming groove 24, a skin contact surface 25, and a first locking portion 26 as shown in Figures 2 to 5.
• the opening 21 is formed at the center of the bottom 20 and, as described above, has a regular polygonal shape, a regular pentagon in this case.
• regular polygonal shape does not mean a strictly regular polygon, but rather an approximately regular polygon.
• the opening 21 has straight portions 21a that form its five sides, and discharge holes 21b located between each of the straight portions 21a, i.e., at the corners of the regular polygon.
• the straight portions 21a are portions that follow the cutting edge 11 of each blade 10, and are set at a distance from the engaging projection 23 so that, when the blade 10 is positioned on the bottom 20 as shown in Figures 3 and 5, the cutting edge 11 protrudes further toward the central axis C than the straight portions 21a.
• each straight portion 21a is set to be equal to or greater than the longitudinal dimension of the blade 10.
• the discharge holes 21b are approximately circular openings at the corners of the regular polygonal shape, and are connected to the flow path grooves 24, facilitating the discharge of water and dirt when cleaning the razor 1.
• the seat portion 22 is the portion where the blade body 10 is positioned, and is provided at multiple locations (here, five locations) along the circumferential direction centered on the central axis C, at equal intervals, extending radially from the straight portion 21a relative to the central axis C.
• the blade body 10 is positioned so that it abuts against the surface 22a of the seat portion 22, and as shown in Figure 6, the surface 22a is inclined at an angle of, for example, 10 degrees to 30 degrees so that it approaches the skin contact surface 25 as it approaches the straight portion 21a. Therefore, the blade body 10 positioned on the seat portion 22 abuts against the skin at that inclination angle, allowing for easier shaving.
• the engagement protrusions 23 are provided at the center of each seat 22, protruding from the seat 22. They position the blade 10 and, in this embodiment, also serve to integrate the bottom 20 and body 30.
• the engagement protrusions 23 are arranged in three positions along the longitudinal direction of the blade 10, with the two protrusions 23a on either side positioned to correspond to the ends of the elongated hole 12 in the blade 10 and the one protrusion 23b located between them at the center of the elongated hole 12.
• the protrusions 23a have a T-shaped cross section and an arc-shaped tip that fits along the elongated hole 12, ensuring that the blade 10 is positioned properly on the seat 22.
• the protrusion 23b is higher than the protrusion 23a and has a cross-shaped cross section with a rounded tip. It fits into the body 30 before the protrusion 23a, making it easier to position the bottom 20 and body 30 when connecting them.
• the flow path forming groove 24 is formed in a location corresponding to the periphery of the blade body 10, surrounding the seat portion 22 and reaching the opening 21, and is configured as a groove recessed below the seat portion 22.
• the skin contact surface 25 is the surface of the bottom 20 opposite the body 30, and is the surface that comes into contact with the user's skin when shaving.
• the skin contact surface 25 may be either curved or flat, but it is preferable for the skin contact surface 25 to be curved so that it protrudes slightly away from the body 30 as it moves towards the central axis C, as this allows the cutting edge 11 of the blade body 10 to press against the skin when it comes into contact with the hair.
• the opening 21 mentioned above is located in the center of this skin contact surface 25.
• the first locking portion 26 is a connecting member that connects the bottom portion 20 and the body portion 30, and engages with the second locking portion 313 (described later) provided on the body portion 30.
• the first locking portion 26 is provided on the side of the bottom portion 20 opposite the skin-contact surface 25, i.e., on the body portion 30 side, and stands upright toward the body portion 30 at a position inside the outer edge of the bottom portion 20.
• the number of first locking portions 26 is arbitrary, but here there are five, the same number as the number of blades 10.
• Each first locking portion 26 is positioned radially outward from each blade body 10, centered on the central axis C.
• the first locking portions 26 may have any shape as long as they engage with the second locking portion 313 on the body portion 30 side, but here they are rectangular with a through hole 26a formed on the inside.
• a circular flat surface 27 is formed on the bottom 20, centered on the central axis C, on the outer periphery of the first locking portion 26, and an R-shaped curved surface 28 is formed between the flat surface 27 and the skin-contacting surface 25.
• the flat surface 27 is in close contact with the body 30 and is hidden inside the razor 1, and the outer wall surface of the body 30 and the curved surface 28 are connected as a seamless surface to form the outer wall of the razor 1.
• the body 30 is a component that is connected to the side of the bottom 20 opposite the skin-contacting surface 25, thereby being integrated with the blade 10 and bottom 20.
• the body 30 is made up of two parts: a housing 31 and a lid 32, but it may also be made up of a single part.
• the housing 31 is a component located between the bottom 20 and the lid 32, and is constructed, for example, as a single resin molded component, with a generally cylindrical shape.
• the housing 31 serves to connect the body 30 to the bottom 20, to clamp the blade 10 together with the bottom 20, and to cover the cutting edge 11 of the blade 10 to protect the skin from injury.
• the housing 31 has an outer edge 311, a body 312, a second locking portion 313, a support wall 314, a comb structure 315, a connecting protrusion 316, etc.
• the outer edge portion 311 is generally tubular and forms part of the outer shape of the razor 1.
• the inner periphery of the outer edge portion 311 is provided with multiple connecting portions 311a that protrude radially inward from the central axis C, and the body portion 312 is connected to the inner periphery of the outer edge portion 311 via these connecting portions 311a.
• the portions between the outer edge portion 311 and the body portion 312 that are not connected by the connecting portions 311a form window portions 311b that extend through in the direction of the central axis C.
• the connecting portions 311a are formed at positions that correspond to the spaces between the multiple blade bodies 10, and the positions that correspond to each of the multiple blade bodies 10, i.e., the positions that correspond to each first locking portion 26, form window portions 311b.
• the body portion 312 is a generally cylindrical portion located inside the outer edge portion 311, and is a portion that integrates the portions that make up the second locking portion 313, support wall 314, and comb structure 315 with the outer edge portion 311.
• the second locking portion 313 is located on the outer edge side of the body portion 312 at a position corresponding to the window portion 311b, and the support wall 314 and comb structure 315 are located on the bottom 20 side of the body portion 312. In both directions along the central axis C, the body portion 312 protrudes beyond the outer edge portion 311, with the support wall 314 and comb structure 315 provided on the portion that protrudes toward the bottom 20, and a connecting protrusion 316 provided on the portion that protrudes toward the lid portion 32.
• the second locking portion 313 is also provided so as to extend from the portion of the body portion 312 that protrudes toward the lid portion 32, through the window portion 311b, to the portion that protrudes toward the bottom 20. Additionally, the inner periphery of the body portion 312 is hollow, forming part of the hollow portion 33 formed in the trunk portion 30.
• the second locking portion 313 is a connecting member that, together with the first locking portion 26, connects the bottom portion 20 and the body portion 30.
• the second locking portion 313 is shaped to extend from the outer wall of the body portion 312 toward the bottom portion 20 within the window portion 311b. More specifically, the second locking portion 313 has a base end 313a near the end face of the body portion 312 opposite the bottom portion 20, extends a predetermined distance from the base end 313a toward the radially outer side of the body portion 312, and then bends back at a right angle from there and extends toward the bottom portion 20 to form the locking piece 313b.
• a gap is formed between the locking piece 313b and the outer wall surface of the body portion 312, allowing the locking piece 313b to be elastically deformable.
• a protrusion 313c is provided that protrudes opposite the body portion 312, i.e., radially outward from the central axis C. This protrusion 313c fits into the through hole 26a of the first locking portion 26, locking the first locking portion 26 and the second locking portion 313 together.
• the support wall 314 is configured by protruding the portion of the body portion 312 corresponding to the placement location of the blade 10 toward the bottom portion 20, and the pressing portion 314a is configured by the tip surface of the support wall 314 facing the bottom portion 20.
• the pressing portion 314a is inclined at the same inclination angle as the seat portion 22 formed on the bottom portion 20 with respect to a plane normal to the central axis C, so that it approaches the skin contact surface 25 as it approaches the central axis C. Then, by engaging the first locking portion 26 and the second locking portion 313, the blade 10 is sandwiched between the seat portion 22 on the bottom portion 20 and the pressing portion 314a.
• the support wall 314 has a linear portion 314b and a cylindrical portion 314c.
• the linear portion 314b is shaped to fit along the cutting edge 11 of the blade body 10.
• the cylindrical portion 314c protrudes from the linear portion 314b toward the locking piece 313b at three locations: both ends and the center of the linear portion 314b.
• the tips of the linear portion 314b and the cylindrical portion 314c form the pressing portion 314a mentioned above.
• the support wall 314 also has engagement holes 314d and 314e formed therein, into which the engagement protrusion 23 formed on the bottom portion 20 fits.
• the engagement holes 314d and 314e are formed inside each of the three cylindrical portions 314c in the pressing portion 314a.
• Each of the engagement holes 314d, 314e is a circular hole with dimensions and positions corresponding to the three engagement protrusions 23.
• Each engagement protrusion 23 fits into these engagement holes 314d, 314e, and the outer walls of the engagement protrusions 23 tightly fit into the inner walls of the engagement holes 314d, 314e, reducing rattling between the housing part 31 and the bottom part 20.
• the support wall 314 is sized to fit inside the blade body 10, and the area outside the support wall 314 in the planar direction of the blade body 10 is hollow. Therefore, when cleaning the razor 1, this hollow, together with the flow path-forming groove 24, acts as a flow path, making it easier to drain water and dirt.
• the comb structure 315 is composed of multiple comb teeth 315a that protrude inward from the linear portion 314b of the support wall 314, i.e., opposite the cylindrical portion 314c.
• the comb teeth 315a are arranged at equal intervals along the cutting edge 11 of the blade body 10.
• the spacing I1 between the comb teeth 315a and the width W1 in the arrangement direction are arbitrary, but the spacing I1 is set to 0.4 mm or more and 1.0 mm or less, the pitch between the comb teeth 315a is set to 0.8 mm or more and 2.5 mm or less, and the width W1 is set to 0.4 mm or more and 2.0 mm or less.
• each comb tooth 315a protrudes beyond the linear portion 21a of the base 20 and curves toward the skin contact surface 25.
• This protruding portion toward the skin contact surface 25 constitutes the cover portion 315b, covering the cutting edge 11.
• the cover portion 315b protrudes toward the skin contact surface 25 to the extent that it overlaps with an extension of the cutting edge 11 in the planar direction of the blade body 10.
• the shortest distance L1 from the skin contact surface 25 to the cutting edge 11 is 0.15 mm or more and 0.25 mm or less.
• the amount of protrusion P1 of the comb teeth 315a from the cutting edge 11 radially inward relative to the central axis C can also be set arbitrarily, but here, the protrusion amount P1 is set to 0.5 mm or more and 1.2 mm or less.
• each comb tooth 315a is generally rounded, and the tip of the cover portion 315b is also rounded. This allows the comb teeth 315a to slide easily over the skin surface and is shaped to prevent them from catching on the skin or causing damage when shaving.
• the comb teeth 315a are spaced apart from the blade body 10. Specifically, when viewed from the direction along the central axis C, the comb teeth 315a are spaced apart from the blade body 10 over the entire area of the portion of the comb teeth 315a that overlaps with the flat surface portion of the blade body 10. In other words, the pressing portion 314a protrudes more than the comb teeth 315a, and a clearance is provided between the comb teeth 315a and the blade body 10 on the cutting edge 11 side of the pressing portion 314a. This makes it difficult for hair to become caught between the comb teeth 315a and the blade body 10 when shaving.
• the connecting protrusions 316 are provided in multiple numbers on the outer edge side of the portion of the body portion 312 that protrudes from the outer edge portion 311 toward the lid portion 32, protruding radially outward relative to the central axis C.
• the lid portion 32 can be connected to the housing portion 31 via these connecting protrusions 316.
• the lid 32 is connected to the housing 31 on the side opposite the bottom 20, thereby constituting the body 30 together with the housing 31.
• the lid 32 has an arched cross section taken radially about the central axis C, forming a dome shape with rotational symmetry around the apex of the arch.
• the inside of the lid 32 is hollow, and is connected to the cavity of the housing 31 to form a hollow section 33.
• the lid 32 is provided with communication holes 321 that connect the hollow section 33 to the outside of the body 30, allowing water to be injected or discharged when cleaning the razor 1.
• Multiple communication holes 321 are formed in a circumferential row around the central axis C, in other words, the apex of the arch, and are arranged at equal intervals in this case.
• the shape of the communication holes 321 is arbitrary, but may be, for example, a rectangular or elliptical shape with the radial direction from the apex of the arch as the longitudinal direction.
• a connecting groove or connecting protrusion corresponding to the connecting protrusion 316 formed on the housing part 31 is formed on the inside of the lid part 32, allowing the lid part 32 to be connected to the housing part 31.
• the end of the lid portion 32 facing the housing portion 31 has a ring-shaped flat surface 322 centered on the central axis C, the outer diameter of which coincides with the outer edge portion 311 of the housing portion 31. Therefore, when the lid portion 32 is connected to the housing portion 31 as shown in FIG. 1, the flat surface 322 comes into close contact with the outer edge portion 311 and is hidden inside the razor 1, and the outer wall surface of the housing portion 31 and the outer wall surface of the lid portion 32 are connected as a seamless surface to form the outer wall of the razor 1.
• the razor 1 is used, for example, for shaving body hair.
• the razor 1 is placed with the skin contact surface 25 against the area to be shaved, and the razor 1 is moved in any direction while lightly pressing the razor 1; in other words, the razor is shaved by gently stroking the skin.
• the razor 1 has a polygonal opening 21, and the cutting edges 11 of the multiple blades 10 are arranged in a polygonal shape, so that the cutting edge 11 of any of the multiple blades 10 comes into contact with the hair and cuts it.
• the direction of travel of the hair which is opposite the direction of movement of the razor 1, is designated as A1
• the direction of travel A1 is perpendicular to the cutting edge 11 that cuts the hair, but it may also be inclined relative to the perpendicular direction.
• the angle between the cutting edge 11 and the direction of travel A1 is 45 degrees or more, the hair can be cut accurately even if the cutting edge 11 is inclined relative to the perpendicular direction of the direction of travel A1.
• five or more blade bodies 10 are used, and the blade bodies 10 are arranged in a regular pentagonal shape or a regular polygonal shape with more sides. In this way, regardless of the direction of travel A1, one of the cutting edges 11 of the multiple blade bodies 10 will always be at an angle of 45 degrees or more relative to the direction of travel A1, ensuring good shaving.
• the skin contact surface 25 on which the blade bodies 10 are provided and the body portion 30 integrated with the skin contact surface 25 will also become larger, which may make it difficult to hold in the hand.
• the blade length which is the length of the cutting edge 11
• the blade length 10 mm or more it is possible to prevent the amount of hair that can be cut in one stroke of the razor 1 from becoming too small.
• the blade length 25 mm or less it is possible to prevent the razor 1 from becoming too large due to an increase in the area of the opening 21, and to avoid the razor 1 becoming too large, making it difficult to hold or store.
• the razor 1 of this embodiment comprises multiple blade bodies 10 each having a linear cutting edge 11, as well as a skin-contacting surface 25 in which openings 21 are formed, and a body portion 30 which defines a hollow portion 33 connected to the openings 21 and is integral with the skin-contacting surface 25.
• the openings 21 are arranged in a regular polygonal shape, and the cutting edges 11 of the multiple blade bodies 10 are arranged along each side of the regular polygonal shape defined by the openings 21, so that the cutting edges 11 are arranged facing each other in a regular polygonal shape.
• the razor 1 can be made to shave a wide area with a smooth shave. Furthermore, because multiple blade bodies 10 are arranged in a regular polygonal shape, shaving can be easily performed by simply moving the razor 1 while bringing the skin-contacting surface 25 into contact with the skin, regardless of the orientation of the blade bodies 10 during shaving. Furthermore, because of the simple shape of the straight cutting edges 11, ready-made products can also be used as the blade bodies 10.
• the blades 10 are arranged in a regular pentagonal shape or a regular polygonal shape with more sides, no matter which direction the direction of travel A1 faces, one of the cutting edges 11 of the multiple blades 10 will always be at an angle of 45 degrees or more to the direction of travel A1, ensuring good shaving results.
• the razor 1 is equipped with a comb structure 315 that covers each of the cutting edges 11 of the multiple blade bodies 10 and has multiple comb teeth 315a that protrude further inward into the opening 21 than the cutting edges 11 they cover, allowing hair to pass through the comb teeth 315a before coming into contact with the cutting edges 11 and being cut.
• each cutting edge 11 of the multiple blade bodies 10 is covered with comb teeth 315a, allowing for safe shaving without damaging the skin.
• the razor 1 has a structure in which multiple blade bodies 10 are arranged in a regular polygonal shape, allowing for shaving in any direction, there are not only blade bodies 10 whose cutting edges 11 are nearly perpendicular to the hair movement direction A1 during shaving, but also blade bodies 10 whose cutting edges 11 face longitudinally along the hair movement direction A1.
• covering them with comb teeth 315a makes it possible to shave safely.
• the spacing I1 between the multiple comb teeth 315a is set to 1.0 mm or less, and the shortest distance L1 from the skin contact surface 25 to the cutting edge 11 is set to 0.15 mm or more.
• the comb teeth 315a ensure that the shortest distance L1 from the skin contact surface 25 to the cutting edge 11 is 0.15 mm or more, so the cutting edge 11 can be placed slightly away from the skin, preventing the cutting edge 11 from coming into direct contact with the skin and further reducing the risk of skin injury.
• the body 30 of the razor 1 of this embodiment 1 has an arched cross-sectional shape and is dome-shaped with rotational symmetry around the apex of the arch.
• the razor 1 can be used by gripping it as if enveloping the entire body 30, making it easy to hold and use. Furthermore, when moving the razor 1 in various directions to shave, the dome shape, i.e., the circular shape when viewed from above, does not limit the direction of movement of the razor 1 based on its shape, and it can be moved freely in any direction to shave. This also makes it possible to increase the degree of freedom in shaving operability. In particular, as younger people are increasingly removing unwanted hair, and razors are sometimes used by minors, making the body 30 dome-shaped makes it easy to use for younger people as well.
• the opening 21 is a regular polygon in shape on the skin-contacting surface 25, making the body 30 dome-shaped gives the razor 1 a rounded, soft-looking design. Therefore, even though the razor 1 is a cutting tool, it gives the user a gentle impression.
• the body 30 is provided with a hollow portion 33 and a communication hole 321 that connects the hollow portion 33 to the outside of the body 30.
• a communication hole 321 By forming such a communication hole 321 in the body 30, if water or shaved hair gets into the hollow portion 33 of the body 30, it is possible to discharge these substances, thereby keeping the razor 1 clean.
• the body 30 is dome-shaped with an arched cross section, forming multiple communication holes 321 in a row in the circumferential direction centered on the apex of the arch allows water and dirt to be discharged from any position. Furthermore, the communication holes 321 act as a grip, improving the stability of holding the razor 1 when shaving. In addition, the presence of the communication holes 321 adds an accent and can also enhance the design of the razor 1.
• the body 30 and bottom 20 are connected, and the blade body 10 is clamped between them.
• the body 30 is provided with a comb structure 315 having multiple comb teeth 315a, as well as a pressing portion 314a that presses the blade body 10 on the inside of the cutting edge 11 of the blade body 10.
• the bottom 20 is also provided with a seat 22, and the blade body 10 is clamped between the pressing portion 314a and the seat 22.
• a flow path-forming groove 24 is provided in a location corresponding to the periphery of the blade body 10, surrounding the seat 22 and leading to the opening 21, and a clearance is provided between the comb teeth 315a and the blade body 10 on the cutting edge 11 side of the pressing portion 314a of the blade body 10.
• the blade 10 can be made with a simple shape, such as a straight cutting edge 11, and because ready-made products can be used as the blade 10, waste can be reduced, contributing to SDG Goal 12, "Responsible Consumption and Production.”
• the blade 10 can be manufactured using existing equipment, the manufacturing process can be simplified and the amount of surplus material that would otherwise be wasted can be reduced, contributing to SDG Goals 12 and 13.
• Second Embodiment The second embodiment will be described. This embodiment is different from the first embodiment in that the structure of the body 30 and the like are changed, but the rest is the same as the first embodiment, so only the parts that are different from the first embodiment will be described.
• the razor 1 of this embodiment is provided with a handle 40 that protrudes from the body 30 on one side of the body 30 opposite the skin contact surface 25.
• the handle 40 may be formed integrally with the cover 32 of the body 30, for example, or may be configured to be connected to the cover 32.
• the gripping portion 40 has a structure in which the dimensions of the skin-contacting surface 25 are enlarged in the planar direction at the tip end protruding from the body portion 30. Specifically, the gripping portion 40 has a structure having a side surface 41 and a tip end 42.
• the dimension of the skin contact surface 25 on the side surface 41 in the planar direction gradually decreases as the height from the body portion 30 increases, and then gradually increases from halfway.
• the side surface 41 has a narrowed shape halfway along the height direction.
• the tip portion 42 has an elliptical shape, and is curved so as to gradually approach the body portion 30 in one direction from the central axis C indicated by arrow A2 in the figure.
• the thickness of the body 30 is thinner than in the first embodiment, but the thickness of the body 30 is optional. Also, the body 30 does not have a communication hole 321, but a communication hole 321 may be formed. Even in this case, the razor 1 can be cleaned by pouring water into the opening 21.
• this embodiment is equipped with the grip portion 40, which allows the razor 1 to be held and used.
• the razor 1 can be held by wrapping the hand around the grip portion 40, i.e., with the thumb 51 in contact with the side surface 41 and the other fingers covering the grip portion 40.
• the tip portion 42 is curved in one direction so that it gradually approaches the body portion 30, and therefore matches the shape of the thumb 51 when holding the razor 1, allowing the grip portion 40 to be held in a comfortable manner.
• the gripping portion 40 is held between the index finger 52 and middle finger 53, while the body portion 30 is gripped with the thumb 51, as shown in Figure 13.
• the side surface 41 has a narrowed shape, it can be comfortably held between the index finger 52 and middle finger 53, making it possible to hold the gripping portion 40 in a comfortable manner.
• the tip portion 42 has a curved shape that gradually approaches the body portion 30 in one direction, it matches the shape of each finger when holding the razor 1, allowing the gripping portion 40 to be held in a comfortable manner. Then, shaving can be performed by pressing the razor 1 toward the skin and stroking it as shown by the arrow in the figure.
• the body 30 is provided with a comb structure 315, and the portions of the bottom 20 corresponding to each side of the regular polygon formed by the opening 21 are made into straight line portions 21a.
• the linear portions 314b of the pressing portion 314a of the body 30 may be formed up to a position close to the cutting edge 11, and the bottom 20 may be provided with a comb structure.
• the cutting edge 11 is covered by the cover portion 315b of the comb teeth 315a of the comb structure 315 to prevent injury to the skin.
• a sheet-like guard sheet with multiple holes formed along the cutting edge 11 may be attached to the blade body 10, and the cutting edge 11 may be exposed through the multiple holes while the guard sheet prevents injury to the skin.
• the opening 21 is configured as a regular polygon
• the cutting edges 11 of the multiple blade bodies 10 are also arranged in a regular polygonal shape, but these need not necessarily be regular polygonal shapes.
• the four sides of a pentagon may be the same size, with the remaining side being longer or shorter than the other four sides.
• it may be an elongated polygon in which one pair of opposing sides is longer than the other two pairs of opposing sides.
• the dimensions of the blade bodies 10 can be varied to form a polygonal shape.
• blade bodies 10 with a simple shape of straight cutting edges 11, albeit of different sizes, will suffice, and ready-made products can also be used.
• the regular polygon shape described in each embodiment does not mean a strictly regular polygon, but rather means that the overall contour shape is approximately a regular polygon.
• the opening 21 has a shape including straight portions 21a and discharge holes 21b, so although the shape of the opening 21 is not a strictly regular polygon, the overall contour shape is close to a regular polygon. While each side of the opening 21 is made to have straight portions 21a, they may be curved rather than straight, or may be wavy.
• a regular polygon shape is formed by arranging the cutting edges 11 of multiple blade bodies 10 facing each other, but there are gaps between the blade bodies 10, and although the shape when the cutting edges 11 are arranged is not a strictly regular polygon, the overall contour shape is close to a regular polygon.

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• 2024
  • 2024-03-15 JP JP2024041533A patent/JP7710557B1/ja active Active
• 2025
  • 2025-03-05 WO PCT/JP2025/007932 patent/WO2025192388A1/ja active Pending
  • 2025-07-07 JP JP2025114616A patent/JP2025141985A/ja active Pending

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