This application claims the benefit of Korean Patent Application No. 10-2023-0087843 filed on Jul. 6, 2023, the contents of which are all hereby incorporated by reference herein in their entirety.
The present disclosure relates to a razor cartridge, and more particularly to, a razor cartridge in which a blade is accommodated.
A razor is a product for cutting body hair such as fine hair on the face or body, and beard. The razor includes a handle for gripping and a razor cartridge for contacting the skin to shave.
One aspect is a razor cartridge that provides excellent shaving performance while relieving skin irritation by including blades with various shaving angles (SA).
The aspects of the present disclosure are not limited to those mentioned above, and other aspects not mentioned herein will be clearly understood by those skilled in the art from the following description.
Another aspect is a razor cartridge that includes: a first blade including a first base portion and a first edge portion forming a predetermined angle with the first base portion and having a first cutting edge; a second blade located adjacent to the rear of the first blade, the second blade including a second base portion and a second edge portion forming a predetermined angle with the second base portion and having a second cutting edge; and a blade housing including a guard and a cap defining a shaving plane, the blade housing accommodating the first blade and the second blade such that the first cutting edge and the second cutting edge are exposed toward the front between the guard and the cap, wherein a first gap, which is a gap between the first cutting edge and the second cutting edge, is greater than a second gap between the first base portion and the second base portion, measured along a direction parallel to a virtual straight line passing through the first cutting edge and the second cutting edge.
Other specific details of the present disclosure are included in the detailed description and drawings.
According to the embodiments of the present disclosure, there are at least the following benefits.
Excellent shaving performance can be maintained while reducing skin irritation.
The benefits according to the embodiments of the present disclosure are not limited to the contents exemplified above, and further various benefits are included in the present specification.
Razors are divided into system razors with replaceable razor cartridges and portable razors with non-replaceable razor cartridges.
A razor cartridge includes at least one blade longitudinally accommodated within a blade housing, and the cutting edge of the blade is exposed through the top of the blade housing.
The shaving plane may be defined as a virtual plane in contact with a guard located in front of an upper surface of the razor cartridge and a cap located in rear of the upper surface of the razor cartridge.
A shave angle (SA), which is the angle at which the cutting edge of the blade faces the shaving plane, is closely related to shaving feel and shaving performance.
When the SA is small, there is a high probability that the cutting edge does not come into direct contact with the skin, providing a smooth shave with less irritation felt by the skin during a shaving process. However, since the cutting edge does not adhere closely to the skin, there is a high possibility that a clean shave will not be achieved.
On the other hand, when the SA is large, the cutting edge is in direct contact with the skin, so a clean shave is achieved, but the irritation felt by the skin becomes stronger.
The advantages and features of the present disclosure and methods of achieving them will be apparent from the embodiments that will be described in detail with reference to the accompanying drawings. It should be noted, however, that the present disclosure is not limited to the following embodiments, and may be implemented in various different forms. Rather the embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the technical field to which the present disclosure pertains, and the present disclosure will only be defined by the appended claims.
In addition, the embodiments described herein will be described with reference to cross-sectional diagrams and/or schematic diagrams, which are ideal exemplary views of the present disclosure. Accordingly, variations from the shapes of the exemplary diagrams as a result, for example, of manufacturing techniques and/or tolerances are to be expected. In addition, in each drawing illustrated in the present disclosure, each component may be illustrated somewhat enlarged or reduced in consideration of convenience of explanation. Like reference numerals designate like components throughout the specification.
Further, first, second, i), ii), a), b) and the like terms may be used in describing elements according to embodiments of the disclosure. Such terms are used solely for the purpose of differentiating one element from another, but not limit the substances, the order, sequence, etc. of those elements. Throughout this specification, when a part ‘includes’ or ‘comprises’ an element, the part is meant to further include other elements rather than excluding other elements unless otherwise stated explicitly.
Hereinafter, a razor according to embodiments of the present disclosure will be described with reference to the accompanying drawings.
Referring to
The handle 20 includes a handle body 21 and a handle head 22.
The handle body 21 refers to a portion to be gripped by a user. The handle head 22 is provided at one end of the handle body 21, allows the razor cartridge 10 to be removably coupled thereto, and pivotably supports the coupled razor cartridge 10.
In addition, the handle head 22 may removably couple with a handle coupling unit 114. In this connection, the handle 20 may be provided with an operation unit (not shown) for operating the handle head 22. A user may operate the operation unit to release the coupling between the handle head 22 and the handle coupling unit 114.
Referring to
The blade housing 110 may include a frame 111, a guard 112, and a cap 113.
With respect to the frame 111, the guard 112 is formed in front of the frame 111, and the cap 113 is formed in rear of the frame. Herein, the front indicates the positive X-axial direction in
The guard 112 adheres to a user's skin during a shaving process and pulls the skin, thereby improving the shaving benefit of the blade 120. To more effectively pull the user's skin, the guard 112 may have an embossed or engraved pattern on an upper surface thereof, and the upper surface of the guard 112 may be made of rubber, silicone, or the like material. The upper surface of the guard 112 corresponds to a front area in the upper surface of the blade housing 110.
The cap 113 may include a lubrication band 113a exposed on the upper surface of the blade housing 110. The lubrication band 113a includes a lubricating material, and applies the lubricating material onto a skin surface where the blade 120 has passed during the shaving process. The lubricating material may contain components for protecting the skin after shaving. The upper surface of the cap 113 corresponds to a rear area in the upper surface of the blade housing 110.
A shaving plane S may be defined as a virtual plane in contact with the upper surface of the guard 112 and the upper surface of the cap 113.
The frame 111 may include a central portion thereof formed open upwards.
The frame 111 accommodates each blade 120 therein longitudinally, and each blade 120 may be arranged in a row in a lateral direction with other blades 120. Herein, the longitudinal direction refers to a direction parallel to the Y axis in
The plurality of blades 120 may include a first blade 121 located at the frontmost side, a third blade 123 located at the rearmost side, and a second blade 122 located between the first blade 121 and the third blade 123.
The frame 111 may include the handle coupling unit 114 (see
Referring to
Referring to
The first blade 121 may include the first cutting edge 121a, the first edge portion 121b, and the first base portion 121c.
The first edge portion 121b may extend upward (Z direction) and forward (X direction) from the first base portion 121c, and the first cutting edge 121a may be formed at an end of the first edge portion 121b. The first cutting edge 121a may be formed by sharpening the end of the first edge portion 121b to cut body hair.
The second blade 122 may also include a second cutting edge 122a, a second edge portion 122b, and a second base portion 122c similar to the first blade 121, and the third blade 123 may also include a third cutting edge 123a, a third edge portion 123b, and a third base portion 123c similar to the first blade 121.
In
Referring to
The blade support portion 115 may include a support end 115a supporting the edge portions 121b, 122b, and 123b of each blade 120, and an accommodation groove 115b accommodating and supporting the base portions 121c, 122c, and 123c of each blade 120. The support end 115a may be configured to seat the edge portions 121b, 122b, and 123b, or may be configured to be adjacent to the edge portions 121b, 122b, and 123b. The accommodation groove 115b may be formed between adjacent support ends 115a.
The blade support portion 115 may be located between the guard 112 and the cap 113 and may be configured to accommodate and support both sides of each blade 120. Alternatively, the blade support portion 115 may be provided discontinuously in the longitudinal direction to accommodate and support both sides and the central portion of each blade 120. The blade support portion 115 may extend from the frame 111. Alternatively, the blade support portion 115 may extend from the guard 112 and/or the cap 113.
Although not shown, at least one washing hole penetrating vertically through the support end 115a may be formed in the blade support portion 115. Washing holes are formed between each blade 121, 122, and 123 to allow sludge generated during a shaving process to be easily discharged to the outside along with washing water.
The blade support portion 115 may be formed to have different heights. In this connection, the protrusion value of the cutting edges 121a, 122a, and 123a of each blade 120 with respect to the shaving plane S may be adjusted by using the step of the bottoms of the accommodation groove 115b.
The blades 120 are accommodated in the frame 111 such that at least a portion of the cutting edges 121a, 122a, and 123a are exposed to the upper surface of the blade housing 110 through the opened upper portion of the frame 111. The blades 120 are accommodated in the frame 111 so that the cutting edges 121a, 122a, and 123a face toward the front of the blade housing 110 (positive X-axis direction). Accordingly, the guard 112 is located in front of the cutting edges 121a, 122a, and 123a, and the cap 113 is located in rear of the cutting edges 121a, 122a, and 123a. Referring to
The first blade 121 is located between the second blade 122 and the guard 112, the second blade 122 is located between the first blade 121 and the cap 113 and also located between the third blade 123 and the guard 112, and the third blade 123 is located between the second blade 122 and the cap 113.
Referring to
The second blade 122 is disposed so that a virtual line A2 extending from the second edge portion 122b forms an angle of θ2 with the shaving plane S. The A2 may mean an extension of the central axis of the second edge portion 122b that passes through the second cutting edge 122a.
The first blade 121 and the second blade 122 may be formed or disposed so that θ1 is smaller than θ2.
The angles θ1 and θ2 between the shaving plane S and the virtual lines A1 and A2 extending from each edge portion 121b or 122b of the first blade 121 and the second blade 122 may be defined as a shave angle SA. The SA may mean an entering angle of the cutting edges 121a and 122a with respect to the shaving plane S, or may mean an entering angle of the cutting edges 121a and 122a with respect to a skin contact surface.
The SA is closely related to shaving feeling and shaving performance.
For example, when the SA is small, there is a high probability that the cutting edge does not directly contact the skin, providing a smooth shave with less irritation felt by the skin during a shaving process. However, since the cutting edge does not adhere closely to the skin, there is a high possibility that a clean shave will not be achieved.
On the other hand, when the SA is large, the cutting edge is in direct contact with the skin and the shave is performed, resulting in a clean shave, but the irritation felt by the skin becomes stronger.
In the razor cartridge according to this embodiment, at least some of the blades 121, 122, and 123 are disposed to have different SA, thereby reducing skin irritation during a shaving process and simultaneously achieving a clean shave.
In particular, the shaving angle θ1 of the first blade 121, which cuts the hair first in a shaving process, is formed to be smaller than the shaving angle θ2 of the second blade 122 that follows, so that skin irritation occurring during the initial cutting process of body hair by the first cutting edge 121a may be reduced.
Since the shaving angle θ2 of the second blade 122, which follows the first blade 121 and cuts body hair, is formed to be larger than the shaving angle θ1 of the first blade 121, so that the body hair remaining after being cut by the first blade 121 is cut more cleanly by the second cutting edge 122a, enabling a cleaner shave.
For example, the shaving angle θ1 of the first blade 121 may be determined within a range of 8 degrees to 23 degrees. The shaving angle θ2 of the second blade 122 may be formed to be larger than the shaving angle θ1 of the first blade 121 within the range of 15 degrees to 29 degrees (see Table 1, described later).
The shaving angles θ1 and 02 of each blade 121 or 122 may be related to a radius of curvature R1 of the edge portions 121b and 122b of each blade 121 or 122. As the radius of curvature of the edge portions 121b and 122b becomes smaller, the shaving angles θ1 and θ2 may become smaller. As the radius of curvature of the edge portions 121b and 122b becomes larger, the shaving angles θ1 and θ2 may become larger.
Accordingly, the radius of curvature of the edge portion 121b of the first blade 121 may be smaller than the radius of curvature formed by the edge portion 122b of the second blade 122.
When the cutting edge of the blade is located lower than the shaving plane S, the blade or cutting edge may be expressed as having a negative protrusion value. When the cutting edge of the blade is located on the shaving plane, the blade or cutting edge may be expressed as having a protrusion value of 0 or as being in a neutral state. When the cutting edge of the blade is located above the shaving plane, the blade or cutting edge may be expressed as having a positive protrusion value.
In general, a cutting edge with a negative protrusion value causes less shaving irritation, but it may be difficult to achieve a clean shave because it is difficult to cut body hair close to the skin. Conversely, a cutting edge with a positive protrusion value allows for a clean shave, but may cause severe shaving irritation due to contact with the skin.
Referring again to
The second cutting edge 122a may be located closer to the shaving plane S than the first cutting edge 121a. For example, the second cutting edge 122a may be disposed to have a protrusion value of 0. In this connection, the second cutting edge 122a may exhibit cleaner shaving performance than the first cutting edge 121a.
The angle between the first edge portion 121b and the first base portion 121c may be formed to be smaller than the angle between the second edge portion 122b and the second base portion 122c so that the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
In this connection, the first base portion 121c and the second base portion 122c may be disposed approximately in parallel.
Referring to
The boundaries 121d and 122d between the edge portions 121b and 122b and the base portions 121c and 122c of each blade 121 or 122 may be a point where bending begins. Alternatively, the boundaries 121d and 122d may be defined as a point where a side facing a different direction from the direction in which one side of the base portions 121c and 122c faces. Alternatively, the boundaries 121d and 122d may be defined as points where the thickness of a cross section parallel to the thickness direction of the base portions 121c and 122c is different from the thickness of the base portions 121c and 122c (for example, a point having a thickness greater than the thickness of the base portions 121c and 122c).
As described above, the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
Accordingly, when the lengths of the first edge portion 121b and the second edge portion 122b are formed to be approximately the same, the vertical distance (or shortest distance) between the boundary 121d between the first edge portion 121b and the first base portion 121c and the shaving plane S is shorter than the vertical distance (or shortest distance) between the boundary 122d between the second edge portion 122b and the second base portion 122c and the shaving plane S.
As a result, the boundary 121d between the first edge portion 121b and the first base portion 121c may be located above the boundary 122d between the second edge portion 122b and the second base portion 122c by a distance of G1.
Additionally, a vertical length H1 of the first base portion 121c may be longer than a vertical length H2 of the second base portion 122c.
For example, when the lower end of the first base portion 121c and the lower end of the second base portion 122c are located on the same horizontal plane, as described above, the boundary 121d between the first edge portion 121b and the first base portion 121c may be located above the boundary 122d between the second edge portion 122b and the second base portion 122c by a distance of G1. Accordingly, the vertical length H1 of the first base portion 121c may be formed to be longer than the vertical length H2 of the second base portion 122c.
Unlike the example shown in
In this connection, when the lengths of the first edge portion 121b and the second edge portion 122b are the same, the shaving angle θ2 of the second cutting edge portion 122a is formed larger than the shaving angle θ1 of the first cutting edge 121a. Accordingly, the second cutting edge 122a is located above the first cutting edge 121a.
Conversely, when the length of the second edge portion 122b is configured to be shorter than the first edge portion 121b, the first cutting edge 121a and the second cutting edge 122a may be located at the same height.
In other words, when the boundaries 121d and 122d of each blade 121 and 122 are located at the same height, by adjusting the length of each edge portion 121b or 122b, the protrusion value of each cutting edge 121a or 122a with respect to the shaving plane S may be controlled.
Referring to
The angles θ1 and θ2 in
Referring to
The angles θ1 and θ2 in
For convenience of explanation, the disposition relationship between the first blade 121 and the second blade 122 has been described based on
The disposition relationship between the first blade 121 and the second blade 122 has been described in detail with reference to
Referring to
The angle θ3 may be defined as the angle between the virtual line A3 extending from the third edge portion 123b and the shaving plane S, the angle between the shaving plane S and the virtual line extending from the lower surface of the third cutting edge 123a or the third edge portion 123b similar to what is described with reference to
The second blade 122 and the third blade 123 may be disposed so that θ2 is equal to or smaller than θ3.
A shaving angle θ3 of the third blade 123 that follows the second blade 122 and cuts body hair is the same as the shaving angle θ2 of the second blade 122 or is formed larger than the shaving angle θ2 of the second blade 122 so that the body hair remaining after being cut by the second blade 122 is cut more cleanly by the third cutting edge 123a, enabling a cleaner shave.
The shaving angle θ3 of the third blade 123 may also be related to the radius of curvature of the third edge portion 123b. The radius of curvature of the third edge portion 123b may be larger than the radius of curvature formed by the edge portion 121b of the first blade 121, and may be greater than or equal to the radius of curvature formed by the edge portion 122b of the second blade 122.
Additionally, the third blade 123 may be formed such that the third cutting edge 123a is located above the shaving plane S. As described above, the third blade 123 is formed to have the shaving angle θ3 for clean shaving. When the third cutting edge 123a has a positive protrusion value, the benefit of providing clean shaving performance by the third blade 123 may be further increased. However, it is not limited thereto, and the third cutting edge 123a may be formed to have a protrusion value of 0 or a negative protrusion value.
The second blade 122 may be disposed so that the second cutting edge 122a has a protrusion value located between the first cutting edge 121a and the third cutting edge 123a with respect to the shaving plane S.
The angle between the third edge portion 123b and the third base portion 123c may be formed to be greater than the angle between the second edge portion 122b and the second base portion 122c so that the shaving angle θ3 of the third cutting edge 123a is greater than the shaving angle θ2 of the second cutting edge 122a. In this connection, the third base portion 123c may be disposed approximately parallel to the first base portion 121c and the second base portion 122c.
Referring to
Accordingly, the boundary 122d between the second edge portion 122b and the second base portion 122c may be located above the boundary 123d between the third edge portion 123b and the third base portion 123c by a distance of G2.
Referring to
In addition, when the shaving angle θ3 of the third cutting edge 123a is formed to be larger than the shaving angle θ2 of the second cutting edge 122a, and when the lengths of the second edge portion 122b and the third edge portion 123b are the same, the third cutting edge 123a may be located above the second cutting edge 122a.
Conversely, when the length of the third edge portion 123b is configured to be shorter than the second edge portion 122b, the third cutting edge 123a and the second cutting edge 122a may be located at the same height.
Referring to
As described above, the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
Accordingly, when the first base portion 121c and the second base portion 122c are disposed approximately in parallel, the gap between the first edge portion 121b and the second edge portion 122b increases as the distance from the base portions 121c and 122c increases. As a result, the gap C1 between the first cutting edge 121a and the second cutting edge 122a becomes larger than the gap D1 between the first base portion 121c and the second base portion 122c.
When the shaving angle θ1 of the first cutting edge 121a and the shaving angle θ2 of the second cutting edge 122a are the same, and when the first base portion 121c and the second base portion 122c are disposed approximately in parallel, the gap C1 between the first cutting edge 121a and the second cutting edge 122a and the gap D1 between the first base portion 121c and the second base portion 122c are the same.
[Table 1] and [Table 2] summarize the results of actual measurements of C1 and D1 while variously changing the relative disposition between the first blade 121 and the second blade 122 so that the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
The disposition examples in [Table 1] and the disposition examples in [Table 2] have the same θ1, θ2, and span. In other words, disposition example 1 of [Table 1] and disposition example 1 of [Table 2] have the same θ1, θ2, and span. However, the span in [Table 1] is based on the cutting edge, and the span in [Table 2] is based on the base portion.
More specifically, the data in [Table 1] is a result measured by defining the horizontal distance between the first cutting edge 121a and the second cutting edge 122a, that is, the horizontal distance of the line extending in the vertical direction from the first cutting edge 121a and the line extending in the vertical direction from the second cutting edge 122a, as the span. The data in [Table 2] is a result measured by defining the horizontal distance between the first base portion 121c and the second base portion 122c, that is, the horizontal distance between the rear surface of the first base portion 121c and the front surface of the second base portion 122c facing each other, as the span.
The difference C1-D1 between the gap C1 between the first cutting edge 121a and the second cutting edge 122a and the gap D1 between the first base portion 121c and the second base portion 122c may be within the range of 0.01 to 0.35 mm.
The ratio C1/D1 of the gap C1 between the first cutting edge 121a and the second cutting edge 122a to the gap D1 between the first base portion 121c and the second base portion 122c may be within the range of 1.05 to 1.5.
For convenience of explanation, the gap between the first blade 121 and the second blade 122 has been described based on
The first blade 121 and the second blade 122 have been described in detail with reference to
Referring to
The shaving angle θ2 of the second cutting edge 122a may be smaller than the shaving angle θ3 of the third cutting edge 123a. When the second base portion 122c and the third base portion 123c are disposed appropriately in parallel, the gap between the second edge portion 122b and the third edge portion 123b increases as the distance from the base portions 122c and 123c increases. As a result, the gap C2 between the second cutting edge 122a and the third cutting edge 123a becomes larger than the gap D2 between the second base portion 122c and the third base portion 123c.
Referring to
The rinsing channels may be divided into first rinsing channels R11 and R12 and second rinsing channels R21 and R22.
The first rinsing channels R11 and R12 refer to the space between adjacent edge portions 121b, 122b, and 123b, and the second rinsing channels R21 and R22 refer to the space between adjacent base portions 121c, 122c, and 123c. More specifically, the space R11 between the first edge portion 121b and the second edge portion 122b and the space R12 between the second edge portion 122b and the third edge portion 123b each form a separate first rinsing channel. In addition, the space R21 between the first base portion 121c and the second base portion 122c forms a second rinsing channel communicating with the space R11 between the first edge portion 121b and the second edge portion 122b, and the space R22 between the second base portion 122c and the third base portion 123c forms a second rinsing channel communicating with the space R12 between the second edge portion 122b and the third edge portion 123b.
The first rinsing channels R11 and R12 include rinsing openings through which shaving residue flows. The rinsing opening may be defined as the space between adjacent cutting edges 121a, 122a, and 123a. More specifically, the space between the first cutting edge 121a and the second cutting edge 122a may be defined as a rinsing opening of the first rinsing channel R11 between the first edge portion 121b and the second edge portion 122b, and the space between the second cutting edge 122a and the third cutting edge 123a may be defined as a rinsing opening of the first rinsing channel R12 between the second edge portion 122b and the third edge portion 123b.
As described above, the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
Accordingly, a width W11 of the first rinsing channel R11 between the first edge portion 121b and the second edge portion 122b includes a gradually decreasing section from the rinsing opening toward the second rinsing channel R21 between the first base portion 121c and the second base portion 122c.
In addition, when the shaving angle θ2 of the second cutting edge 122a is formed to be smaller than the shaving angle θ3 of the third cutting edge 123a, a width W12 of the first rinsing channel R12 between the second edge portion 122b and the third edge portion 123b includes a gradually decreasing section from the rinsing opening toward the second rinsing channel R22 between the second base portion 122c and the third base portion 123c.
In other words, according to this embodiment, the rinsing openings of the first rinsing channels R11 and R12 may be configured to be wide. As a result, shaving residue easily flows into the first rinsing channels R11 and R12, thereby improving rinsing performance.
When the difference between θ2 and θ1 is greater than the difference between θ3 and θ2, the opening of the first rinsing channel R11 between the first edge portion 121b and the second edge portion 122b may be formed to be wider than the opening of the first rinsing channel R12 between the second edge portion 122b and the third edge portion 123b.
Conversely, when the difference between θ3 and θ2 is greater than the difference between θ2 and θ1, the opening of the first rinsing channel R12 between the second edge portion 122b and the third edge portion 123b may be formed to be wider than the opening of the first rinsing channel R11 between the first edge portion 121b and the second edge portion 122b.
Additionally, upon comparing disposition example 1 and disposition example 6 or disposition example 2 and disposition example 8 in [Table 1], it was identified that in the disposition example where the span and θ1 are the same but θ2 is larger, the value of C1-D1 was larger. In addition, upon comparing disposition example 1 and disposition example 9 in [Table 1], it was identified that in the disposition example where the span and θ2 are the same but θ1 is smaller, the value of C1-D1 was larger. The difference between C1 and D1 is associated with the difference in the width of the first rinsing channel R11 between the first edge portion 121b and the second edge portion 122b and the second rinsing channel R21 between the first base portion 121c and the second base portion 122c.
In other words, the relative size of the rinsing opening between each of the blades 121, 122, and 123 may be adjusted using the difference in the shaving angles θ1, θ2, and θ3.
When the first base portion 121c, the second base portion 122c, and the third base portion 123c are arranged parallel to each other, a width W21 of the second rinsing channel R21 between the first base portion 121c and the second base portion 122c and a width W22 of the second rinsing channel R22 between the second base portion 122c and the third base portion 123c may each be formed to have a constant width as the distance from the first rinsing channel R11 or R12 increases.
In addition, even when the first base portion 121c, the second base portion 122c, and the third base portion 123c are disposed at equal intervals from each other, according to this embodiment, rinsing performance may be improved by configuring the rinsing opening of the first rinsing channel R11 or R12 to be wide using a design in which at least some of the shaving angles θ1, θ2, and θ3 of each cutting edge 121a, 122a, and 123a according to this embodiment are different.
Generally, razor cartridges are designed and manufactured so that the base portions of each blade are disposed at equal intervals from each other for convenience in the design and manufacturing process. Even though the blades 121, 122, and 123 according to this embodiment are installed in the blade housing designed so that the base portions of the blades are disposed at equal intervals from each other, the shaving angles θ1, θ2, and θ3 of each cutting edge 121a, 122a, and 123a may be configured differently, and the rinsing openings of the first rinsing channels R11 and R12 may be configured to be wide, so that rinsing performance may be improved.
With reference to
For example, when the razor cartridge 10 includes four blades, two first blades 121, one second blade 122, and one third blade 123 may be disposed in order; one first blade 121, two second blades 122, and one third blade 123 may be disposed in order; or one first blade 121, one second blade 122, and two third blades 123 may be disposed in order.
Alternatively, at least one of the first blade 121, the second blade 122, and the third blade 123 may be configured in a plural number, and the razor cartridge 10 may be configured to include five or more blades.
Hereinafter, a razor cartridge according to another embodiment will be described. For convenience of explanation, portions similar to the aforementioned embodiment are given the same reference numerals, and descriptions of portions common to the aforementioned embodiment are omitted.
The razor cartridge according to the second embodiment of the present disclosure includes the first blade 121, the second blade 122, and the third blade 223.
Referring to
The blades 121, 122, and 123 according to the aforementioned first embodiment each form different shaving angles θ1, θ2, and θ3 with respect to the shaving plane S. However, in the blades 121, 122, and 223 according to the second embodiment, the second blade 122 and the third blade 223 form approximately the same shaving angle θ2 with respect to the shaving plane S, and only the first blade 121 form a different shaving angle θ1 with respect to the shaving plane S. The first blade 121 may be disposed so that θ1 is smaller than θ2.
In order to further increase the benefit of reducing shaving irritation by the first blade 121, the first blade 121 may be disposed so that the first cutting edge 121a is located lower than the shaving plane S. However, it is not limited thereto, and the first cutting edge 121a may be formed to have a protrusion value of 0 or a positive protrusion value.
In order to further increase the clean shaving benefit by the third blade 223, the third blade 223 may be disposed so that the third cutting edge 223a is located above the shaving plane S. However, it is not limited thereto, and the third cutting edge 223a may be formed to have a protrusion value of 0 or a negative protrusion value.
The second blade 122 may be disposed so that the second cutting edge 122a has a protrusion value located between the first cutting edge 121a and the third cutting edge 223a with respect to the shaving plane S. For example, the second cutting edge 122a may be disposed to have a protrusion value of 0. The second cutting edge 122a may provide a cleaner shaving performance than the first cutting edge 121a and provide a less irritating shaving feeling than the third cutting edge 223a.
As described above, the shaving angle θ1 of the first cutting edge 121a is smaller than the shaving angle θ2 of the second cutting edge 122a.
Accordingly, when the first base portion 121c and the second base portion 122c are disposed approximately in parallel, the gap between the first cutting edge 121a and the second cutting edge 122a is larger than a gap D3 between the first base portion 121c and the second base portion 122c.
However, according to this embodiment, the shaving angle θ2 of the second cutting edge 122a and the third cutting edge 223a is formed to be approximately the same. Accordingly, when the second blade 122 and the third blade 223 are formed substantially the same, and when the second base portion 122c and the third base portion 223c are disposed approximately in parallel, the gap between the second cutting edge 122a and the third cutting edge 223a may be approximately equal to a gap D4 between the second base portion 122c and the third base portion 223c.
In addition, the shaving angle θ1 of the first cutting edge 121a is formed to be smaller than the shaving angle θ2 of the second cutting edge 122a, and the shaving angle θ2 of the second cutting edge 122a and the third cutting edge 223a is formed to be approximately the same. Accordingly, the gap between the first cutting edge 121a and the second cutting edge 122a may be formed larger than the gap between the second cutting edge 122a and the third cutting edge 223a.
In addition, the ratio of the gap between the second cutting edge 122a and the third cutting edge 223a to the gap between the first cutting edge 121a and the second cutting edge 122a may be configured to be greater than the ratio of the lateral gap between the second base portion 122c and the third base portion 223c to the lateral gap between the first base portion 121c and the second base portion 122c.
According to this embodiment, the blades 121, 122, and 223 provide two types of shaving angles θ1, θ2, and θ2. Accordingly, the first cutting edge 121a, which forms a relatively small shaving angle θ1, is used to reduce skin irritation occurring during the initial cutting process of body hair, and the second cutting edge 122a and the third cutting edge 223a, which form a relatively large shaving angle θ2, are used to cleanly cut the remaining body hair after being cut by the first blade 121, thereby enabling a clean shave.
Referring to
Since the first blade 121 and the second blade 122 are the same as those described in the aforementioned first and/or second embodiments, further description thereof will be omitted.
The fourth blade 124 is located in front of the first blade 121. In other words, the fourth blade 124 is located between the guard 112 (see
Similar to the first blade 121, the fourth blade 124 includes a fourth cutting edge 124a, a fourth edge portion 124b, and a fourth base portion 124c.
Referring to
In order to further increase the benefit of reducing shaving irritation by the fourth blade 124, the fourth blade 124 may be disposed so that the fourth cutting edge 124a is located lower than the shaving plane S. However, it is not limited thereto, and the fourth cutting edge 124a may be formed to have a protrusion value of 0 or a positive protrusion value.
In order to further increase the clean shaving benefit by the second blade 122, the second blade 122 may be disposed so that the second cutting edge 122a is located above the shaving plane S. However, it is not limited thereto, and the second cutting edge 122a may be formed to have a protrusion value of 0 or a negative protrusion value.
The first blade 121 may be disposed so that the first cutting edge 121a has a protrusion value located between the fourth cutting edge 124a and the second cutting edge 122a with respect to the shaving plane S. For example, the first cutting edge 121a may be disposed to have a protrusion value of 0. The first cutting edge 121a may provide a cleaner shaving performance than the fourth cutting edge 124a and provide a less irritating shaving feeling than the second cutting edge 122a.
As described above, the shaving angle θ1 of the first cutting edge 121a and the fourth cutting edge 124a is smaller than the shaving angle θ2 of the second cutting edge 122a.
Accordingly, the gap between the first cutting edge 121a and the second cutting edge 122a may be formed to be larger than the gap between the first cutting edge 121a and the fourth cutting edge 124a.
As such, when the first blade 121 and the fourth blade 124 are formed substantially the same, and when the first base portion 121c and the fourth base portion 124c are disposed approximately in parallel, the gap between the first cutting edge 121a and the fourth cutting edge 124a may be approximately equal to a gap D5 between the first base portion 121c and the fourth base portion 124c.
In addition, the ratio of the gap between the first cutting edge 121a and the fourth cutting edge 124a to the gap between the first cutting edge 121a and the second cutting edge 122a may be configured to be smaller than the ratio of the lateral gap between the first base portion 121c and the fourth base portion 124c to the lateral gap between the first base portion 121c and the second base portion 122c.
The razor cartridge according to the fourth embodiment of the present disclosure includes the first blade 121, the second blade 122, the third blade 123 or 223, and the fourth blade 124.
Since the first blade 121, the second blade 122, and the third blade 123 or 223 are the same as those described in the aforementioned first and/or second embodiments, further description thereof will be omitted.
Referring to
Similar to the first blade 121, the fourth blade 124 includes the fourth cutting edge 124a, the fourth edge portion 124b, and the fourth base portion 124c.
Referring to
The shaving angle θ4 of the fourth blade 124 may be smaller than the shaving angle θ1 of the first blade 121.
In this connection, the fourth cutting edge 124a of the fourth blade 124 may cut body hair with less shaving irritation than that of the first blade 121. In order to improve the benefit of reducing shaving irritation caused by the fourth blade 124, the fourth cutting edge 124a may be disposed to have a negative protrusion value. For example, the fourth cutting edge 124a may be located lower than the first cutting edge 121a from the shaving plane S. However, it is not limited thereto, and the fourth cutting edge 124a may be formed to have a protrusion value of 0 or a positive protrusion value.
In this connection, the shaving angle θ4 of the fourth cutting edge 124a is formed to be smaller than the shaving angle θ1 of the first cutting edge 121a. Accordingly, when the first base portion 121c and the fourth base portion 124c are disposed approximately in parallel, the gap between the first cutting edge 121a and the fourth cutting edge 124a becomes larger than the gap between the first base portion 121c and the fourth base portion 124c.
Alternatively, the shaving angle θ4 of the fourth blade 124 may be formed to be larger than the shaving angle θ1 of the first blade 121. In this connection, the fourth cutting edge 124a of the fourth blade 124 provides cleaner shaving performance compared to the first cutting edge 121a, and thus may compensate for the deterioration in shaving performance caused by the first cutting edge 121a.
In this connection, in order to reduce shaving irritation caused by the fourth cutting edge 124a, the fourth cutting edge 124a may be disposed to have a negative protrusion value. For example, the fourth cutting edge 124a may be located lower than the first cutting edge 121a from the shaving plane S. However, it is not limited thereto, and the fourth cutting edge 124a may be formed to have a protrusion value of 0 or a positive protrusion value.
In this connection, the shaving angle θ4 of the fourth cutting edge 124a is formed to be larger than the shaving angle θ1 of the first cutting edge 121a. Accordingly, when the first base portion 121c and the fourth base portion 124c are disposed approximately in parallel, the gap between the first cutting edge 121a and the fourth cutting edge 124a becomes smaller than the gap between the first base portion 121c and the fourth base portion 124c.
The razor cartridge according to the fifth embodiment of the present disclosure includes a first blade 321, a second blade 322, and a third blade 323.
The first blade 321 may include a first cutting edge 321a, a first edge portion 321b, and a first base portion 321c.
The first edge portion 321b may extend upward (Z direction) and forward (X direction) from the first base portion 321c, and the first cutting edge 321a may be formed at an end of the first edge portion 321b. The first cutting edge 321a may be formed by sharpening the end of the first edge portion 321b to cut body hair.
The second blade 322 may also include a second cutting edge 322a, a second edge portion 322b, and a second base portion 322c similar to the first blade 321, and the third blade 323 may also include a third cutting edge 323a, a third edge portion 323b, and a third base portion 323c similar to the first blade 321.
Referring to
The first blade 121 and the second blade 122 may be disposed so that θ1 is smaller than θ2, and the second blade 122 and the third blade 123 may be disposed so that θ2 is smaller than θ3. Since the benefit thereof has been described in detail in the aforementioned embodiments, further description thereof will be omitted. In addition, since the angle ranges of θ1, θ2, and θ3 have been described in detail in the aforementioned embodiments, further description thereof will be omitted.
In order to further increase the benefit of reducing shaving irritation by the first blade 321, the first blade 321 may be disposed so that the first cutting edge 321a is located lower than the shaving plane S. However, it is not limited thereto, and the first cutting edge 321a may be formed to have a protrusion value of 0 or a positive protrusion value.
In order to further increase the clean shaving benefit by the third blade 323, the third blade 323 may be disposed so that the third cutting edge 323a is located above the shaving plane S. However, it is not limited thereto, and the third cutting edge 323a may be formed to have a protrusion value of 0 or a negative protrusion value.
The second blade 322 may be disposed so that the second cutting edge 322a has a protrusion value located between the first cutting edge 321a and the third cutting edge 323a with respect to the shaving plane S. For example, the second cutting edge 322a may be disposed to have a protrusion value of 0. The second cutting edge 322a may provide a cleaner shaving performance than the first cutting edge 321a and provide a less irritating shaving feeling than the third cutting edge 323a.
The blades 321, 322, and 323 according to this embodiment may be manufactured to have the same shape. However, in order that the shaving angle θ1 of the first cutting edge 321a, the shaving angle θ2 of the second cutting edge 322a, and the shaving angle θ3 of the third cutting edge 323a form different angles, each of the blades 321, 322, and 323 may be disposed not parallel to each other.
Referring to
More specifically, the first blade 321 may be rotated counterclockwise about a Y axis by an angle of α1 compared to the second blade 322. Additionally, the third blade 323 may be rotated clockwise about the Y axis by an angle of α2 compared to the second blade 322.
Accordingly, even when the blades 321, 322, and 323 are manufactured to have the same shape, the shaving angle θ1 of the first cutting edge 321a becomes smaller than the shaving angle θ2 of the second cutting edge 322a, and the shaving angle θ3 of the third cutting edge 323a becomes larger than the shaving angle θ2 of the second cutting edge 322a.
In
In addition, the gap between the first blade 321 and the second blade 322 gradually narrows as moving from the cutting edges 321a and 322a to the base portions 321c and 322c. Accordingly, the gap between the first cutting edge 321a and the second cutting edge 322a becomes larger than the gap between the first base portion 321c and the second base portion 322c.
The gap between the second blade 322 and the third blade 323 also gradually narrows as moving from the cutting edges 322a and 323a to the base portions 322c and 323c. Accordingly, the gap between the second cutting edge 322a and the third cutting edge 323a becomes larger than the gap between the second base portion 322c and the third base portion 323c.
In addition, the space R11 and R21 between the first blade 321 and the second blade 322 and space R12 and R22 between the second blade 322 and the third blade 323 may form the rinsing channel. The rinsing channels may be divided into the first rinsing channels R11 and R12 and the second rinsing channels R21 and R22.
A width of the first rinsing channel R11 between the first edge portion 321b and the second edge portion 322b includes a gradually decreasing section from the rinsing opening toward the second rinsing channel R21 between the first base portion 321c and the second base portion 322c. In addition, a width of the second rinsing channel R21 between the first base portion 321c and the second base portion 322c includes a section that becomes smaller as going farther from the first rinsing channel R11.
A width of the first rinsing channel R12 between the second edge portion 322b and the third edge portion 323b includes a gradually decreasing section from the rinsing opening toward the second rinsing channel R22 between the second base portion 322c and the third base portion 323c. In addition, a width of the second rinsing channel R22 between the second base portion 322c and the third base portion 323c includes a section that becomes smaller as going farther from the first rinsing channel R12.
In this embodiment, the description is made based on a configuration including three blades 321, 322, and 323 having different shaving angles θ1, θ2, and θ3. However, similar to the embodiment described with reference to
As described above, the razor cartridge according to various embodiments of the present disclosure include blades forming at least two or more shaving angles SA to reduce skin irritation during a shaving process and simultaneously achieve a clean shave.
In addition, at least some of the blades according to the aforementioned embodiments may be used as asymmetric blades in which a facing edge in contact with the skin and a non-facing edge located on the opposite side of the facing edge are formed asymmetrically. In this connection, the benefit of relieving skin irritation using the asymmetric blade is added to the benefit of relieving skin irritation using a difference in shaving angles of the blades described in this specification, and the benefit of relieving skin irritation is doubled, providing a comfortable shaving feeling to a user.
In addition, at least some of the blades according to the aforementioned embodiments may be blades in which a hard thin film layer of CrB component is laminated on a base material and a resin coating layer for reducing friction is laminated on the hard thin film layer.
Those skilled in the technical field to which the present disclosure pertains will understand that the present disclosure may be practiced in other detailed forms without departing from the technical spirit or essential features of the present disclosure. Therefore, it should be understood that the above-described embodiments are exemplary in all aspects rather than being restrictive. The scope of the present disclosure is defined by the following claims rather than by the preceding description. It should be interpreted that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present disclosure.
Number | Date | Country | Kind |
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10-2023-0087843 | Jul 2023 | KR | national |