razor

Abstract

The present invention provides a razor that can shave hair by using a blade body with a straight cutting edge without using a special circular blade, and by moving the blade in any direction while keeping the skin-contacting surface in contact with the skin. [Solution] The device comprises a plurality of blade bodies 10 having straight cutting edges 11, a skin contact surface 25 having an opening 21 that exposes the cutting edges 11, and a body portion 30 that is integrated with the skin contact surface 25 and forms a hollow portion 33 connected to the opening 21. The opening 21 is configured as a regular polygon, and the cutting edges 11 of the plurality of blade bodies 10 are arranged along each side of the regular polygon formed by the opening 21, so that the cutting edges 11 of the plurality of blade bodies 10 face each other and are arranged in a regular polygon.

Description

Technical Field

[0001] The present disclosure relates to a razor that can perform "stroking shaving" where shaving is done while stroking the skin.

Background Art

[0002] Conventionally, in Patent Document 1, a circular razor having a circular blade has been proposed in a circular opening in a circular housing. The inner circumference of the circular blade in the circular razor is the cutting edge, and a circular guard smaller than the circular blade is arranged inside it.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the circular razor described in Patent Document 1, a circular blade with a special shape is required, which incurs manufacturing and development costs for the circular blade.

[0005] Also, in a circular blade, there is always a part where the cutting edge is parallel to the moving direction of the circular razor during shaving. In a structure where the guard is only arranged at a position away from the cutting edge of the circular blade inside the circular blade, there is a risk of damaging the skin at that parallel part. In particular, if the distance from the skin contact surface to the cutting edge in the circular razor is shortened so that the hair can be shaved close to the root, there is a risk of damaging the skin with the circular blade. Also, if the distance from the skin contact surface to the cutting edge is lengthened to avoid damaging the skin, the hair cannot be shaved short. And if the skin contact surface is strongly pressed against the skin in an attempt to shave short, there is ultimately a risk of damaging the skin.

[0006] The age at which children start shaving unwanted hair is getting younger. Market research revealed that most elementary school fourth graders and junior high school students are concerned about unwanted hair, and many have experience with hair removal. However, both children and their parents are concerned about injuries when young children use razors. Therefore, there is a need to develop a more affordable razor that is safe for young users, allows for intuitive and easy shaving by simply stroking the skin, and can be used safely by anyone, including those with visual impairments or weak grip strength.

[0007] The first objective of this disclosure is to provide a razor that can perform a smooth shave using a blade body with a straight cutting edge without using a special circular blade. In addition, the second objective is to provide a razor that can prevent skin damage more effectively. [Means for solving the problem]

[0008] A razor in the first aspect of this disclosure comprises a plurality of blade bodies (10) having a straight cutting edge (11) for shaving hair, a skin contact surface (25) having an opening (21) that exposes the cutting edges of the blade bodies and that touches the skin, and a body portion (30) that is integral with the skin contact surface and forms a hollow portion (33) connected to the opening, wherein the opening is arranged in a polygonal shape, and the cutting edges of the plurality of blade bodies are arranged along each side of the polygon formed by the opening, so that the cutting edges of the plurality of blade bodies are arranged facing each other in a polygonal shape.

[0009] Thus, by arranging multiple blades with straight cutting edges in a polygonal shape, rather than using a special circular blade, it is possible to create a razor that can shave a wide area by using a "stroke shave," where the razor is moved along the skin while the contact surface is directly touching the skin. Furthermore, because the multiple blades are arranged in a polygonal shape, regardless of the orientation of the blades during shaving, hair can be easily shaved simply by moving the razor while the contact surface is touching the skin.

[0010] A second aspect of this disclosure provides a comb structure (315) having multiple comb teeth (315a) that cover each of the cutting edges of multiple blades and protrude inward from the covered cutting edges into the opening, so that the hair passes through the comb teeth before touching the cutting edge and being cut.

[0011] In this way, each of the multiple blades is covered with comb teeth, allowing for safe shaving without damaging the skin. Furthermore, because the razor has a structure in which multiple blades are arranged in a polygonal shape, allowing for shaving in any direction, there are not only blades whose tips are nearly perpendicular to the direction of hair growth, but also blades whose longitudinal direction is aligned with the direction of hair growth. However, even blades whose longitudinal direction is aligned with the direction of hair growth can be safely shaved by covering them with comb teeth.

[0012] Furthermore, in a second aspect of this disclosure, the spacing between the comb teeth (I1) is 1.0 mm or less, and the shortest distance (L1) from the skin contact surface to the cutting edge of the blade is 0.15 mm or more. For example, the spacing between the 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.

[0013] As described above, by setting the spacing between the comb teeth to 1.0 mm or less, skin getting caught between the teeth is suppressed, preventing the blade from injuring the skin. If the spacing between the comb teeth is 0.4 mm or more, there is enough space for hair to get caught between the comb teeth. In addition, because the comb teeth ensure a minimum distance of 0.15 mm or more from the skin contact surface to the tip of the blade, the tip of the blade can be kept slightly away from the skin, preventing the tip from directly touching the skin and further reducing the risk of skin injury. Furthermore, if the minimum distance is 0.25 mm or less, it becomes possible to cut the hair as close to the root as possible.

[0014] In a third aspect of this disclosure, there are five or more blades, and the five or more blades are arranged in a polygonal shape having five or more sides, and the opening is also a polygonal shape having five or more sides.

[0015] In this way, the arrangement of the blades forms a pentagon or a polygon with more sides, making it possible to shave effectively regardless of the direction of hair growth. Furthermore, by using five blades, the arrangement of the blades and the shape of the opening become pentagonal, which helps to prevent the razor from becoming too large due to the increased number of blades.

[0016] In a fourth aspect of this disclosure, when shaving hair with one of the multiple blades by moving it in any direction while the skin is in contact with the skin contact surface, the angle between the tip of at least one of the multiple blades and the direction of movement is 45 degrees or more.

[0017] In this way, by ensuring that the tip of any of the multiple blades is at an angle of 45 degrees or more to the direction of hair growth, a good shave becomes possible. For example, if the arrangement of the blades is a regular pentagon or a regular polygon with more sides, then no matter which direction the hair is growing, the tip of any of the multiple blades will always be at an angle of 45 degrees or more to the direction of hair growth.

[0018] In a fifth aspect of this disclosure, the fuselage has an arched cross-sectional shape and a dome shape that is rotationally symmetrical around the apex of the arch.

[0019] By making the body of the razor dome-shaped, it can be held and used by gripping the entire body, making it easy to hold and use. Furthermore, when shaving by moving the razor in various directions, the dome shape, or circular shape when viewed from above, does not restrict the direction of movement of the razor, allowing for free movement in any direction. This increases the freedom of shaving operation. In particular, with the increasing trend of hair removal at younger ages, razors may be used by minors, but the dome shape of the body makes it easy to use even for younger users.

[0020] In a sixth aspect of the present disclosure, on the side of the body portion opposite to the skin contact surface, there is provided a gripping portion (40) that protrudes from the body portion to the opposite side and has an enlarged dimension in the plane direction of the skin contact surface at the protruding tip side.

[0021] Thus, if the gripping portion is provided, the razor can be held and used by utilizing the gripping portion. And by configuring the gripping portion in a shape that protrudes from the body portion to the opposite side and has an enlarged dimension in the plane direction of the skin contact surface at the protruding tip side, the gripping portion can be held in a fitting manner.

[0022] In a seventh aspect of the present disclosure, the body portion is provided with a communication hole (321) that connects the hollow portion and the outside of the body portion. By forming such a communication hole in the body portion, when water, shaved hair, etc. enter the hollow portion of the body portion, they can be discharged, and the razor can be kept clean.

[0023] In an eighth aspect of the present disclosure, the body portion has an arch-shaped cross-sectional shape and forms a dome shape centered on the apex of the arch shape, and a plurality of communication holes are formed side by side in the circumferential direction centered on the apex.

[0024] Also, when the body portion is a dome type with an arch-shaped cross section, if a plurality of communication holes are formed side by side in the circumferential direction centered on the apex of the arch shape, water and dirt can be discharged at any position. Furthermore, the communication holes serve as a grip, improving the stability when holding the razor during shaving. In addition, the presence of the communication holes becomes an accent, and the design property of the razor can also be enhanced.

[0025] In a ninth aspect of the present disclosure, there is a bottom portion (20) constituting a skin contact surface, and the body portion and the bottom portion are connected to sandwich a blade body therebetween. Further, the body portion has a comb structure and has a pressing portion (314a) that presses the blade body inside the blade body rather than the blade tip, and a clearance is provided between the comb teeth in the comb structure and the blade body on the blade tip side of the blade body rather than the pressing portion. And the bottom portion has a seat portion (22) that contacts the blade body and sandwiches the blade body together with the pressing portion, and at a location corresponding to the periphery of the blade body, it reaches an opening while surrounding the seat portion, and a flow path forming groove (24) that is recessed more than the seat portion.

[0026] In this way, by providing the flow path forming groove, a flow path during washing with water is configured. Therefore, it becomes possible to wash away hair with water flow through the flow path forming portion. And a clearance is provided between the comb teeth and the blade body, and even if there is hair shaved between the comb teeth and the blade body, it is not strongly sandwiched between the comb teeth and the blade body, so it can be easily washed away with water.

[0027] The reference numerals with parentheses attached to each component etc. show an example of the correspondence relationship between the component etc. and the specific components etc. described in the embodiments described later.

Brief Description of the Drawings

[0028] [Figure 1] It is a perspective view from above of a razor according to a first embodiment of the present disclosure. [Figure 2] It is a perspective view from below of the razor shown in FIG. 1. [Figure 3] It is a bottom view of the razor shown in FIG. 1. [Figure 4] It is an exploded view of the razor shown in FIG. 1. [Figure 5] It is an enlarged partial cross-sectional view of the vicinity of the blade body corresponding to the line V-V in FIG. 6. [Figure 6] It is an enlarged partial cross-sectional view of the vicinity of the blade body corresponding to the line VI-VI in FIG. 5. I [Figure 7] It is an enlarged view of the blade tip of the blade body and the comb tooth structure. [Figure 8]This is a magnified perspective view from below of the blade's cutting edge and comb-tooth structure. [Figure 9] This is a cross-sectional view taken along the line XI-XI in Figure 7. [Figure 10] This is a perspective view of a razor according to a second embodiment of the present disclosure. [Figure 11] Figure 10 shows an example of how to use a razor. [Figure 12] Figure 10 shows another example of how the razor is used. [Figure 13] Figure 10 shows another example of how the razor is used. [Modes for carrying out the invention]

[0029] The embodiments of this disclosure will be described below with reference to the drawings. In each embodiment, including the other embodiments described below, parts that are the same or equivalent to each other will be denoted by the same reference numerals.

[0030] (First Embodiment) Hereinafter, the razor 1 according to the first embodiment of this disclosure will be described with reference to Figures 1 to 9.

[0031] [Composition of Razor 1] The razor 1 shown in Figures 1 to 3 enables hair shaving by stroking, and has a structure in which a body 30 is connected to a base 20 equipped with a blade 10, and is applicable, for example, to shaving body hair. As shown in Figure 2, an opening 21 is formed in the base 20, and the opening 21 is a regular polygon, and each of the multiple blades 10 is placed on each side of the opening 21, so that the blades 10 are also arranged in a regular polygon shape. In this embodiment, there are five blades 10, and the blades 10 and the opening 21 are arranged in a regular pentagon shape. Hereinafter, the center line of the regular polygon shape formed by the opening 21 and the blades 10 will be called the central axis C, and the direction around the central axis will be called the circumferential direction.

[0032] Each blade 10 has the same shape, and as shown in Figures 4 and 5, it is roughly rectangular in shape, with one of its longer sides being the cutting edge 11. As shown in Figures 2 and 3, the cutting edges 11 of the five blades 10 are exposed from the opening 21, and the cutting edges 11 are arranged facing each other in a regular polygonal shape. An oval-shaped slot 12 is formed on the inside of each blade 10, with the long axis being the tangential direction to the circumferential direction. As shown in Figure 5, the bottom 20 and the body 30 are attached by inserting an engaging projection 23 formed on the bottom 20 (described later) into the slot 12. The short axis dimension of the slot 12 is matched to the dimension of the engaging projection 23, so that each blade 10 is held between the bottom 20 and the body 30 without any play.

[0033] Furthermore, a partially protruding projection 13 is formed on one end of the blade body 10 opposite the cutting edge 11. As shown in Figure 5, when the blade body 10 is placed on the seat portion 22 of the base portion 20, which will be described later, the front and back of the blade body 10 can be attached correctly, and the structure in which the projection 13 partially protrudes from the seat portion 22 makes it easy to remove the blade body 10.

[0034] The bottom portion 20 is a component that makes up the part of the razor body 10 that is exposed and comes into contact with the skin when shaving. For example, it is made as a single-piece resin molded product and has a circular dish shape with an opening in the center. As shown in Figure 3, the bottom portion 20 has a circular shape when viewed from below the razor 1, and as shown in Figures 2 to 5, it has an opening 21, a seat portion 22, an engaging projection 23, a flow channel groove 24, a skin contact surface 25, and a first locking portion 26.

[0035] The opening 21 is formed at the center of the bottom 20 and, as described above, is a regular polygon, in this case a regular pentagon. Here, "regular polygon" does not mean a strictly regular polygon, but rather an approximately regular polygon. Specifically, the opening 21 has straight sections 21a that make up the five sides, and discharge holes 21b located between each straight section 21a, that is, at the corners of the regular polygon. The straight sections 21a are the parts that run along the cutting edge 11 of each blade 10, and as shown in Figures 3 and 5, when the blade 10 is placed on the bottom 20, the distance from the engaging projection 23 is set so that the cutting edge 11 protrudes toward the central axis C from the straight section 21a. In addition, each straight section 21a is set to be greater than or equal to the longitudinal dimension of the blade 10. The discharge holes 21b are opened in an approximately circular shape at the corners of the regular polygon and connect to the flow channel groove 24, making it easier to discharge water and dirt when cleaning the razor 1.

[0036] The base portion 22 is the part where the blade body 10 is positioned. It is provided at multiple equally spaced locations, in this case five locations, along the circumferential direction around the central axis C, and extends radially from the straight portion 21a relative to the central axis C. Specifically, the blade body 10 is positioned so as to abut the surface 22a of the base portion 22. As shown in Figure 6, the surface 22a is inclined at an angle of, for example, 10 to 30 degrees, so that it approaches the skin contact surface 25 as it moves toward the straight portion 21a. Therefore, the blade body 10 positioned on the base portion 22 comes into contact with the skin at that angle of inclination, allowing for shaving at a more comfortable angle.

[0037] The engaging projections 23 are provided so as to protrude from the seat portion 22 at the central position of each seat portion 22, and are the part that positions the blade body 10. In this embodiment, they also play a role in integrating the bottom portion 20 and the body portion 30. The engaging projections 23 are provided in a row of three locations along the longitudinal direction of the blade body 10, with the two projections 23a on both sides corresponding to the ends of the elongated hole 12 of the blade body 10, and the projection 23b located between them positioned at the center of the elongated hole 12. As shown in Figure 5, the projection 23a has a T-shaped cross-section, and its tip is shaped like an arc along the elongated hole 12, so that the blade body 10 is positioned on the seat portion 22 without misalignment. The projection 23b is higher than the projection 23a and has a cross-shaped cross-section with a rounded tip, and is fitted into the body portion 30 before the projection 23a, making it easier to position the bottom portion 20 and the body portion 30 when connecting them.

[0038] As shown in Figure 5, the flow channel groove 24 is formed in a location corresponding to the periphery of the blade body 10, surrounding the seat portion 22 and extending to the opening 21, and is composed of a groove that is recessed compared to the seat portion 22. When the razor 1 is washed with water, water and dirt such as shaved hair are discharged through a path that bypasses the support wall 314, particularly through the flow channel groove 24.

[0039] The skin contact surface 25 is the side of the bottom portion 20 opposite to the body portion 30, and is the surface that comes into contact with the user's skin when shaving. The skin contact surface 25 can be either curved or flat, but it is preferable that it be a curved surface that protrudes slightly toward the central axis C toward the side opposite to the body portion 30, so that when it comes into contact with the skin, it can press against the skin and the tip 11 of the blade body 10 can make contact with the base of the hair. The opening 21 described above is located in the center of this skin contact surface 25.

[0040] 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, which will be described later, provided on the body portion 30 side. In this embodiment, the first locking portion 26 is provided on the bottom portion 20 opposite to the skin contact surface 25, that is, on the body portion 30 side, and is erected 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 blades 10. Each first locking portion 26 is positioned radially outward from each blade 10 with respect to the central axis C. The shape of the first locking portion 26 is arbitrary as long as it engages with the second locking portion 313 on the body portion 30 side, but here it is rectangular in shape with a through hole 26a formed on the inside.

[0041] Furthermore, with respect to the central axis C, an annular flat surface 27 is formed on the outer circumference of the bottom portion 20 beyond the first locking portion 26, and an R-shaped curved surface 28 is formed between the flat surface 27 and the skin contact surface 25. As shown in Figure 2, when the bottom portion 20 and the body portion 30 are connected, the flat surface 27 is in close contact with the body portion 30 and hidden inside the razor 1, and the outer wall surface of the body portion 30 and the curved surface 28 are connected as a seamless surface to form the outer wall of the razor 1.

[0042] The body portion 30 is a component that is integrated with the blade body 10 and the bottom portion 20 by being connected to the side opposite to the skin contact surface 25 at the bottom portion 20. In this embodiment, as shown in Figure 4, the body portion 30 is composed of two parts, a housing portion 31 and a lid portion 32, but it may also be composed of one part.

[0043] The housing portion 31 is a component positioned between the bottom portion 20 and the lid portion 32, and is constructed, for example, as a single-piece resin molded product, and is roughly cylindrical in shape. The housing portion 31 has the roles of connecting the body portion 30 to the bottom portion 20, holding the blade body 10 together with the bottom portion 20, and covering the cutting edge 11 of the blade body 10 to protect the skin from injury. Specifically, the housing portion 31 has an outer edge portion 311, a body portion 312, a second locking portion 313, a support wall 314, a comb structure 315, a connecting projection 316, etc.

[0044] The outer edge portion 311 is roughly cylindrical and forms part of the outer shape of the razor 1. Multiple connecting portions 311a are provided on the inner circumference side of the outer edge portion 311, protruding radially inward from the central axis C, and the body portion 312 is connected to the inner circumference of the outer edge portion 311 via these connecting portions 311a. The portion between the outer edge portion 311 and the body portion 312 that is not connected by the connecting portions 311a is a window portion 311b that penetrates in the direction of the central axis C. The connecting portions 311a are formed at positions corresponding to the spaces between the multiple blade bodies 10, and the window portion 311b is at a position corresponding to each of the multiple blade bodies 10, that is, a position corresponding to each first locking portion 26.

[0045] The body portion 312 is a substantially cylindrical portion located inside the outer edge portion 311, and is the portion that integrates the second locking portion 313, the support wall 314, and the 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 the comb structure 315 are located on the bottom portion 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 the comb structure 315 provided on the portion protruding towards the bottom portion 20, and the connecting projection 316 provided on the portion protruding towards the lid portion 32. Furthermore, the second locking portion 313 is provided so as to extend from the portion of the body portion 312 protruding towards the lid portion 32, through the window portion 311b, to the portion protruding towards the bottom portion 20. Furthermore, the inner circumference of the body portion 312 is hollow and forms part of the hollow portion 33 formed in the fuselage portion 30.

[0046] 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. In this embodiment, the second locking portion 313 is shaped to extend from the outer peripheral wall of the body portion 312 toward the bottom portion 20 within the window portion 311b. More specifically, the second locking portion 313 is formed by starting the base end 313a of the body portion 312 near the end face opposite the bottom portion 20, extending a predetermined distance radially outward from the base end 313a, and then folding back at a right angle to extend toward the bottom portion 20, thereby forming the locking piece 313b. Also, as shown in Figure 6, 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. Furthermore, a projection 313c is provided at the tip of the locking piece 313b opposite to the base end 313a, protruding radially outward from the body portion 312, that is, from the central axis C. This projection 313c enters into the through hole 26a of the first locking portion 26, and the first locking portion 26 and the second locking portion 313 are locked together.

[0047] As shown in Figure 4, the support wall 314 is constructed so that the portion of the body portion 312 corresponding to the placement of the blade 10 protrudes toward the bottom portion 20, and the tip surface of the support wall 314 toward the bottom portion 20 constitutes the pressing portion 314a. The pressing portion 314a is inclined with respect to a plane normalized to the central axis C at the same inclination angle as the seat portion 22 formed on the bottom portion 20, so that it approaches the skin contact surface 25 as it moves toward the central axis C. The first locking portion 26 and the second locking portion 313 are locked together, and the blade 10 is held between the seat portion 22 on the bottom portion 20 and the pressing portion 314a.

[0048] As shown in Figures 4 to 6, the support wall 314 has a linear portion 314b and a cylindrical portion 314c. The linear portion 314b is shaped to follow the cutting edge 11 of the blade body 10. The cylindrical portion 314c is shaped to protrude from the linear portion 314b toward the locking piece 313b at three locations: both ends and the center of the linear portion 314b. The pressing portion 314a described above is formed by the tips of these linear portion 314b and cylindrical portion 314c. In addition, the support wall 314 has engagement holes 314d and 314e into which the engagement projection 23 formed on the bottom portion 20 fits. The engagement holes 314d and 314e are formed on the inside of each of the portions of the pressing portion 314a that are made up of the three cylindrical portions 314c. Each of the engagement holes 314d and 314e is a circular hole of the corresponding position and size to the three engagement projections 23. Each of the engagement projections 23 fits into these engagement holes 314d and 314e, and the outer wall of the engagement projection 23 and the inner wall of the engagement holes 314d and 314e are in close contact, thereby suppressing rattling between the housing portion 31 and the bottom portion 20.

[0049] Furthermore, as shown in Figure 6, 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 space, together with the flow channel groove 24, acts as a flow channel, making it easier to discharge water and dirt.

[0050] As shown in Figures 4 to 6, the comb structure 315 is composed of multiple comb teeth 315a that protrude inward from the linear portion 314b of the support wall 314, that is, on the opposite side from the cylindrical portion 314c. As shown in Figure 7, each comb tooth 315a is arranged at equal intervals along the cutting edge 11 of the blade body 10. The spacing I1 and width W1 in the direction of arrangement of each comb 315a are arbitrary, but the spacing I1 is set to 0.4 mm or more and 1.0 mm or less, the pitch of each comb tooth 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. Also, as shown in Figure 8, the tip of each comb tooth 315a protrudes beyond the straight portion 21a of the bottom portion 20 and curves toward the skin contact surface 25. This portion that protrudes toward the skin contact surface 25 constitutes the cover portion 315b, which covers the cutting edge 11. Specifically, as shown in Figure 9, the cover portion 315b protrudes toward the skin contact surface 25 to the extent that it overlaps with the extension line 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 P1 of the protrusion of the comb teeth 315a from the cutting edge 11 radially inward with respect to the central axis C is also arbitrary, but here the protrusion amount P1 is set to 0.5 mm or more and 1.2 mm or less.

[0051] As shown in Figures 7 to 9, the overall shape of each comb tooth 315a is rounded, and the tip of the cover portion 315b is also rounded. Therefore, the comb teeth 315a are shaped to glide easily over the skin surface, preventing them from catching on the skin and causing injury during shaving.

[0052] Furthermore, as shown in Figure 6, the comb teeth 315a are separated from the blade body 10. Specifically, when viewed from a direction along the central axis C, the comb teeth 315a are separated from the blade body 10 throughout the entire area 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 blade tip 11 side of the pressing portion 314a. This makes it possible to create a structure in which hair is less likely to get caught between the comb teeth 315a and the blade body 10 when shaving.

[0053] Multiple connecting protrusions 316 are provided 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, so as to protrude radially outward with respect to the central axis C. The lid portion 32 can be connected to the housing portion 31 via these connecting protrusions 316.

[0054] The lid portion 32 is connected to the housing portion 31 on the opposite side from the bottom portion 20, thereby forming the body portion 30 together with the housing portion 31. The cross-sectional shape of the lid portion 32, when cut radially along the central axis C, is arch-shaped, and it has a dome shape that is rotationally symmetrical around the apex of the arch. The inside of the lid portion 32 is hollow and connects with the hollow of the housing portion 31 to form a hollow portion 33. The lid portion 32 is provided with a communication hole 321 that connects the hollow portion 33 to the outside of the body portion 30, allowing water to be injected or discharged when cleaning the razor 1. Multiple communication holes 321 are formed in a circumferential direction centered on the central axis C, or in other words, around the apex of the arch, and are arranged at equal intervals. The shape of the communication holes 321 is arbitrary, but for example, they can be rectangular or oval with the radial direction around the apex of the arch as the longitudinal direction.

[0055] Although not shown in the figures, the inside of the lid portion 32 has connecting grooves or connecting protrusions that correspond to the connecting protrusions 316 formed on the housing portion 31, so that the lid portion 32 can be connected to the housing portion 31.

[0056] Furthermore, the end of the lid portion 32 on the housing portion 31 side is a ring-shaped flat surface 322 whose outer diameter matches that of the outer edge portion 311 of the housing portion 31, with the central axis C as the center. Therefore, as shown in Figure 1, when the lid portion 32 is connected to the housing portion 31, the flat surface 322 is in close contact with the outer edge portion 311 and 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, forming the outer wall of the razor 1.

[0057] [How to use razor 1] Next, the method of using the razor 1 will be explained. The razor 1 is used, for example, for shaving body hair. The skin contact surface 25 is brought into contact with the area to be shaved, and the razor 1 is moved in any direction while lightly pressing it down. In other words, hair is shaved by "stroking" the skin. The razor 1 has a polygonal opening 21, and the tips 11 of the multiple blades 10 are arranged in a polygonal shape. As a result, one of the tips 11 of the multiple blades 10 will come into contact with the hair and cut it.

[0058] In this case, as shown in Figure 3, if we consider the direction of hair movement opposite to the direction of movement of the razor 1 as A1, it is preferable that the direction of movement A1 is perpendicular to the cutting edge 11 that cuts the hair, but it is also acceptable for it to be inclined relative to the perpendicular direction. As long as the angle between the cutting edge 11 and the direction of movement A1 is 45 degrees or more, the hair can be cut accurately even if the cutting edge 11 is inclined relative to the direction perpendicular to the direction of movement A1. For this reason, in this embodiment, there are five or more blade bodies 10, and the arrangement of the blade bodies 10 is a regular pentagon or a regular polygon with more sides. In this way, no matter which direction the direction of movement A1 is facing, at least one of the cutting edges 11 of the multiple blade bodies 10 will always be at an angle of 45 degrees or more with respect to the direction of movement A1, making it possible to shave hair well.

[0059] However, the more blades 10 there are, the larger the regular polygonal shape formed by the multiple blades 10 become. In this case, the size of the skin contact surface 25 on which the blades 10 are located and the body portion 30 integrated with the skin contact surface 25 become larger, which may make it difficult to hold. For this reason, it is preferable to have five blades 10 and to arrange the blades 10 and the shape of the opening 21 to form a regular pentagon. In this way, the size of the razor 1 can be prevented from becoming too large, and the direction of hair movement A1 when shaving can be made nearly perpendicular to the blade tip 11, making it possible to shave more effectively.

[0060] By reducing the blade length, which is the length of the blade tip 11, it is possible to suppress the enlargement of the regular polygonal shape formed by the multiple blades 10 even if the number of blades 10 increases. However, the area over which hair can be cut in one stroke of the razor 1, in other words, the number of hairs that can be cut, will decrease. For this reason, it is preferable to set the blade length of the blade 10 to a certain dimension, for example, 10 mm or more and 25 mm or less. By setting the blade length to 10 mm or more, it is possible to suppress the amount of hair that can be cut in one stroke of the razor 1 from becoming too small. Also, by setting the blade length to 25 mm or less, it is possible to suppress the enlargement of the razor 1 due to the enlargement of the opening area 21, thus avoiding the razor 1 becoming too large, which would impair its ease of handling and make it difficult to store.

[0061] [Effects of razor 1] The following describes the effects obtained when shaving hair using the razor 1 according to this embodiment.

[0062] (1) The razor 1 of this embodiment comprises a plurality of blade bodies 10 having straight blade tips 11, and a body portion 30 which is integrated with the skin contact surface 25 and forms a skin contact surface 25 with an opening 21, and a hollow portion 33 connected to the opening 21. The opening 21 is arranged in a regular polygon shape, and the blade tips 11 of the plurality of blade bodies 10 are arranged along each side of the regular polygon shape formed by the opening 21 so that the blade tips 11 face each other and are arranged in a regular polygon shape.

[0063] Thus, by arranging multiple blade bodies 10, each having a straight blade tip 11, in a regular polygonal shape, rather than using a special circular blade, a razor 1 can be made capable of shaving a wide area by stroking. Furthermore, because multiple blade bodies 10 are arranged in a regular polygonal shape, regardless of the orientation of the blade body 10 during shaving, hair can be easily shaved simply by moving the razor 1 while keeping the skin contact surface 25 in contact with the skin. In addition, because of the simple shape of the straight blade tip 11, off-the-shelf products can be used as the blade body 10.

[0064] Furthermore, because the arrangement of the blades 10 is in the shape of a regular pentagon or a regular polygon with more sides, no matter which direction the direction of travel A1 is facing, at least 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, enabling effective hair shaving.

[0065] Furthermore, in this embodiment, the blade body 10 is made into five, and the arrangement of the blade body 10 and the shape of the opening 21 are in the shape of a regular pentagon, which helps to prevent the size of the razor 1 from becoming too large.

[0066] (2) The razor 1 is provided with a comb structure 315 which has multiple comb teeth 315a that cover each of the cutting edges 11 of the multiple blade bodies 10 and protrude inward from the opening 21 beyond the covered cutting edges 11, so that the hair passes through the comb teeth 315a before touching and being cut by the cutting edges 11.

[0067] In this way, since each of the multiple blades 10 has a cutting edge 11 covered by the comb teeth 315a, hair can be shaved safely without damaging the skin. Furthermore, because the razor 1 has a structure in which multiple blades 10 are arranged in a regular polygon shape, allowing for hair shaving in any direction, there are not only blades 10 whose cutting edge 11 is nearly perpendicular to the direction of hair growth A1 during shaving, but also blades 10 whose longitudinal direction of the cutting edge 11 is aligned with the direction of hair growth A1. However, even for blades 10 whose longitudinal direction of the cutting edge 11 is aligned with the direction of hair growth A1, it is possible to shave safely by covering them with the comb teeth 315a.

[0068] Furthermore, 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 blade tip 11 is set to 0.15 mm or more. In this way, by setting the spacing I1 between the comb teeth 315a to 1.0 mm or less, it is suppressed that skin gets caught between the comb teeth 315a, and the blade body 10 can prevent the skin from being injured. In addition, because the comb teeth 315a ensure that the shortest distance L1 from the skin contact surface 25 to the blade tip 11 is 0.15 mm or more, the blade tip 11 can be kept slightly away from the skin, so the blade tip 11 does not directly touch the skin, and the risk of injuring the skin can be further avoided.

[0069] (3) The body portion 30 of the razor 1 in this embodiment 1 has an arched cross-sectional shape and a dome shape that is rotationally symmetrical with respect to the apex of the arch.

[0070] In this way, by making the body 30 dome-shaped, the razor 1 can be used by gripping it in a way that encloses the entire body 30, making it easy to hold and use. Furthermore, when shaving by moving the razor 1 in various directions, because the dome shape, that is, the circular shape when viewed from above, does not restrict the direction of movement of the razor 1, allowing for free movement in any direction to shave. This also increases the degree of freedom in shaving operation. In particular, with the increasing trend of hair removal at younger ages, and the fact that it may be used by minors, the dome shape of the body 30 makes it easy to use even for younger users.

[0071] Furthermore, since a regular polygonal opening 21 is formed on the skin contact surface 25, if the body portion 30 is made dome-shaped, the razor 1 can be given a rounded shape and a soft image. As a result, even though the razor 1 is a blade, it can give the user a gentle impression.

[0072] (4) The body portion 30 is provided with a hollow portion 33 and a communication hole 321 connecting the hollow portion 33 to the outside of the body portion 30. By forming such a communication hole 321 in the body portion 30, if water or shaved hair enters the hollow portion 33 of the body portion 30, it becomes possible to discharge them, making it possible to keep the razor 1 clean.

[0073] Furthermore, if the body portion 30 is made into a dome shape with an arched cross-section, forming multiple communication holes 321 in a circumferential direction centered on the apex of the arch allows water and dirt to be discharged from any position. In addition, the communication holes 321 act as a grip, improving stability when holding the razor 1 during shaving. Moreover, the presence of the communication holes 321 can serve as an accent, enhancing the design of the razor 1.

[0074] (5) The body portion 30 and the bottom portion 20 are connected, and the blade body 10 is held between them. Specifically, the body portion 30 is provided with a comb structure 315 having a plurality of comb teeth 315a, and a pressing portion 314a that presses against the blade body 10 inside the cutting edge 11. The bottom portion 20 is provided with a seat portion 22, and the blade body 10 is held between the pressing portion 314a and the seat portion 22. Furthermore, a flow channel groove 24 is provided around the periphery of the blade body 10, surrounding the seat portion 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.

[0075] In this way, the flow channel groove 24 is provided, creating a flow channel for water washing. Therefore, it becomes possible to wash away hair with water flow through the flow channel groove 24. In addition, because a clearance is provided between the comb teeth 315a and the blade body 10, even if shaved hair remains between the comb teeth 315a and the blade body 10, it will not be strongly pinched and can be easily washed away with water. Specifically, as shown by the thick arrows in Figures 5 and 6, when water is poured in from the communication hole 321, the cavity, clearance, and flow channel groove 24 inside the razor 1 become a flow channel, allowing water to flow easily. Therefore, the razor 1 can be easily cleaned. Note that for cleaning the razor 1, the same effect can be obtained by pouring water in from the opening 21 side and discharging it from the communication hole 321 side, rather than from the communication hole 321 side.

[0076] (6) With the razor 1 of this embodiment, hair can be easily shaved simply by moving it in any direction while keeping the skin contact surface 25 in contact with the skin. In this way, by realizing a razor 1 that is easy for anyone to use, it becomes easier to keep clean by removing unwanted hair, and this can contribute to Goal 3, "Good Health and Well-being," of the 17 Sustainable Development Goals (SDGs) adopted at the UN Summit.

[0077] Furthermore, the blade body 10 can be made into a simple shape with a straight cutting edge 11, and since off-the-shelf products can be used as the blade body 10, waste can be reduced, contributing to SDG Goal 12, "Responsible Consumption and Production." In addition, since the blade body 10 can be manufactured using existing equipment, the manufacturing process can be simplified, the amount of surplus material that would otherwise be wasted can be reduced, contributing to SDG Goals 12 and 13.

[0078] (Second Embodiment) A second embodiment will now be described. This embodiment is a modification of the structure of the fuselage section 30 compared to the first embodiment, and is otherwise the same as the first embodiment. Therefore, only the parts that differ from the first embodiment will be described.

[0079] As shown in Figure 10, the razor 1 of this embodiment is provided with a gripping portion 40 that protrudes from the body portion 30 toward the opposite side of the skin contact surface 25 on one side of the body portion 30 that is opposite to the skin contact surface 25. The gripping portion 40 may be formed integrally with the lid portion 32 of the body portion 30, for example, or it may be structured to be connected to the lid portion 32.

[0080] The gripping portion 40 has a structure in which the surface dimension of the skin contact surface 25 is enlarged at the tip end that protrudes from the body portion 30. Specifically, the gripping portion 40 has a structure that includes a side portion 41 and a tip portion 42.

[0081] With respect to the direction along the central axis C of the gripping portion 40 as the height direction, the surface dimension of the skin contact surface 25 on the side surface 41 gradually decreases as the height from the body portion 30 increases, and then gradually increases from a certain point. In other words, the side surface 41 has a constricted shape at a certain point in the height direction. The space between the side surface 41 and the body portion 30 is seamless, with no steps or joints. The tip portion 42, when viewed from the direction along the central axis C, is elliptical in shape and is curved so as to gradually approach the body portion 30 in one direction indicated by arrow A2 in the figure from the central axis C.

[0082] In this embodiment, the thickness of the body portion 30 is thinner than in the first embodiment, but the thickness of the body portion 30 is arbitrary. Also, although the body portion 30 does not have a communication hole 321, a communication hole 321 may be formed therein. Even in this case, the razor 1 can be cleaned by pouring water in from the opening 21 side.

[0083] As described above, this embodiment includes a gripping portion 40, allowing the razor 1 to be held and used by utilizing the gripping portion 40. For example, as shown in Figure 11, the razor 1 can also be held by wrapping the gripping portion 40 in the hand, that is, with the thumb 51 in contact with the side 41, while covering the gripping portion 40 with the entire other fingers. In this case, since the tip portion 42 is curved so as to gradually approach the body portion 30 in one direction, it matches the shape of the thumb 51 when gripping the razor 1, allowing the gripping portion 40 to fit comfortably.

[0084] Furthermore, as shown in Figure 12, when using the razor 1 by hand, the grip portion 40 is held between the index finger 52 and middle finger 53, and the body portion 30 is gripped with the thumb 51, as shown in Figure 13. In this case as well, because the side portion 41 has a constricted shape, it can be comfortably held between the index finger 52 and middle finger 53, allowing the grip portion 40 to fit snugly. In addition, because the tip portion 42 is curved so as to gradually approach the body portion 30 in one direction, it matches the shape of each finger when gripping the razor 1, allowing the grip portion 40 to fit snugly. Then, as indicated by the arrows in the figures, hair can be shaved by pressing the razor 1 toward the skin and shaving with a stroking motion.

[0085] In this way, by providing a gripping portion 40 on the side of the body portion 30 opposite to the skin contact surface 25, it becomes possible to shave hair stably by holding the gripping portion 40.

[0086] (Other embodiments) This disclosure is not limited to the embodiments described above, and can be modified as appropriate within the scope of the claims. Furthermore, it goes without saying that the elements constituting the embodiments are not necessarily essential unless explicitly stated to be particularly essential or considered to be fundamentally essential. Furthermore, when numerical values ​​such as the number, numerical values, quantities, or ranges of the components of the embodiments are mentioned in the embodiments, they are not limited to those specific numbers unless explicitly stated to be particularly essential or considered to be fundamentally limited to a specific number. Furthermore, when the shapes, positional relationships, etc., of the components are mentioned in the embodiments, they are not limited to those shapes, positional relationships, etc., unless explicitly stated or considered to be fundamentally limited to specific shapes, positional relationships, etc.

[0087] For example, in each of the above embodiments, the body portion 30 is provided with a comb structure 315, and the portion of the bottom portion 20 corresponding to each side of the regular polygon formed by the opening 21 is made into a straight section 21a. This is just one example, and it is also possible to have a structure in which the linear portion 314b of the pressing portion 314a of the body portion 30 is formed up to a position close to the cutting edge 11, and the bottom portion 20 is provided with a comb structure.

[0088] Furthermore, in each of the above embodiments, the blade tip 11 is covered by the cover portion 315b of the comb teeth 315a in the comb structure 315 to prevent skin injury. Alternatively, a sheet-like guard sheet with multiple holes formed along the blade tip 11 may be attached to the blade body 10, exposing the blade tip 11 through the multiple holes while preventing skin injury with the guard sheet.

[0089] Furthermore, in each of the above embodiments, the opening 21 is configured as a regular polygon, and the cutting edges 11 of the multiple blades 10 are also arranged in a regular polygon shape. However, these do not necessarily have to be regular polygons; they just need to be polygonal in shape. For example, the four sides of a pentagon may be the same size, and the remaining side may be longer or shorter than the other four sides. Also, when creating a polygon with an even number of sides, which consists of multiple pairs of parallel sides, one pair of opposing sides may be longer than the other two pairs of opposing sides, resulting in an elongated polygon. In these cases, where the polygon is not a regular polygon, the dimensions of the blades 10 can be varied to create the polygonal shape. Even in this case, the blades 10 can be simple in shape, with straight cutting edges 11, although they may differ in size, and off-the-shelf products can be used.

[0090] As mentioned above, the regular polygonal shape described in each embodiment does not mean a strictly regular polygon, but rather that the overall contour shape is approximately a regular polygon. In each embodiment, the opening 21 is made up of a straight section 21a and a discharge hole 21b, so the shape of the opening 21 is not strictly a regular polygon, but the overall contour shape is close to a regular polygon. In this example, each side of the opening 21 is a straight section 21a, but it may also be a curved shape or a wavy shape. Similarly, a regular polygonal shape is formed by arranging the cutting edges 11 of multiple blades 10 facing each other, but there are gaps between the blades 10, so the shape when the cutting edges 11 are lined up is not strictly a regular polygon, but the overall contour shape is close to a regular polygon. [Explanation of Symbols]

[0091] 1...razor, 10...blade body, 11...blade tip, 12...elongated hole, 13...protrusion, 20...bottom, 21...opening, 21a...straight section, 21b...discharge hole, 22...seat, 22a...surface, 23...engaging projection, 23a, 23b...projection, 24...flow channel groove, 25...skin contact surface, 26...first locking section, 26a...through hole, 27...flat surface, 28...curved surface, 30...body section, 31...housing section, 32...lid section, 33...hollow section, 40...grip section, 41...side, 42...tip section, 51…Index finger, 52…Middle finger, 53…Thumb, 311…Outer edge, 311a…Connecting part, 311b…Window part, 312…Body part, 313…Second locking part, 313a…Base end, 313b…Locking piece, 313c…Protrusion, 314…Support wall, 314a…Pressing part, 314b…Linear part, 314c…Cylindrical part, 314d, 314e…Engagement hole, 315…Comb structure, 315a…Comb teeth, 315b…Cover part, 316…Connecting projection, 321…Communication hole, 322…Flat surface

Claims

1. Multiple blades (10) having a straight cutting edge (11) for shaving hair, The blade body has an opening (21) that exposes the cutting edge, and a skin contact surface (25) that comes into contact with the skin, It comprises a body portion (30) which is integrated with the skin contact surface and forms a hollow portion (33) connected to the opening, A razor in which the openings are arranged in a polygonal shape, and the cutting edges of the plurality of blades are positioned along each side of the polygon formed by the openings, so that the cutting edges of the plurality of blades face each other and are arranged in a polygonal shape.

2. The comb structure (315) includes a comb structure (315) that covers each of the multiple cutting edges of the multiple blades, and has multiple comb teeth (315a) that protrude inward from the covered cutting edges of the opening, so that the hair passes through the comb teeth before touching and being cut by the cutting edges, The razor according to claim 1, wherein the spacing between the multiple comb teeth (I1) is 1.0 mm or less, and the shortest distance (L1) from the skin contact surface to the cutting edge of the blade is 0.15 mm or more.

3. The razor according to claim 1, wherein there are five or more blades, the five or more blades are arranged in a polygonal shape having five or more sides, and the opening is a polygonal shape having five or more sides.

4. The razor according to claim 3, wherein when the razor is moved in an arbitrary direction while the skin is in contact with the skin contact surface and hair is shaved with one of the plurality of blades, the angle between the tip of at least one of the plurality of blades and the direction of movement is 45 degrees or more.

5. The razor according to any one of claims 1 to 4, wherein the body portion has an arched cross-sectional shape and forms a dome shape that is rotationally symmetrical with respect to the apex of the arch.

6. The razor according to any one of claims 1 to 4, wherein the body portion opposite to the skin contact surface is provided with a gripping portion (40) that protrudes from the body portion to the opposite side, and at the protruding tip side, the dimensions in the surface direction of the skin contact surface are enlarged.

7. The razor according to any one of claims 1 to 4, wherein the body portion is provided with a communication hole (321) connecting the hollow portion and the outside of the body portion.

8. The aforementioned fuselage section has an arched cross-sectional shape, forming a dome shape centered on the apex of the arch. The razor according to claim 7, wherein the communication holes are formed in a plurality of arrangements in the circumferential direction centered on the vertex.

9. Having a bottom portion (20) that constitutes the skin contact surface, The body portion and the bottom portion are connected, and the blade is held between the body portion and the bottom portion. The body portion has the comb structure and also has a pressing portion (314a) that presses the blade body inside the blade tip, and a clearance is provided between the comb teeth of the comb structure and the blade body on the blade tip side of the pressing portion. The bottom is, A seat portion (22) that contacts the blade body and clamps the blade body together with the pressing portion, In a location corresponding to the periphery of the blade body, a flow channel groove (24) is formed that surrounds the seat portion and extends to the opening, and is recessed compared to the seat portion. The razor according to claim 2, having the following features.

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