Unitary razor blade and shaving razor cartridge using same

Abstract

The present invention relates to a unitary razor blade and to a shaving razor using the same, and more particularly, to a razor blade which is shaped into a geometrical structure so as to achieve the maximized strength thereof. The razor blade according to the present invention comprises: an edge portion having a curved cutting edge; a connection portion which extends from the edge portion and which is formed into a curve; and a support portion extending from the edge portion to support the edge portion and the connection portion, where the edge portion, the connection portion and the support portion are combined into a single body.

Claims

1. A razor blade cartridge comprising: a housing: a razor blade fixedly mounted in the housing including: an edge that is elongated in a direction orthogonal to a shaving direction, the edge includes a cutting edge formed in a single arch and opposing rear and front faces wherein the cutting edge extends along a longitudinal direction which is orthogonal to the shaving direction; a connection portion extending and bent from the edge portion toward a direction orthogonal to the longitudinal direction and orthogonal to the shaving direction, the connection portion having faces continuous with the front and rear faces of the edge portion; and a support portion extending from the connection portion in the direction orthogonal to both the longitudinal direction and the shaving direction, the support portion supporting the edge portion and the connection portion, wherein the edge, the connection portion and the support portion are a single body, and wherein the single body remains fixed in a state where: a middle portion of the cutting edge is convexly curved toward the shaving direction from a straight line connecting opposite ends of the cutting edge and the cutting edge is convexly curved toward the direction orthogonal to both the longitudinal direction and the shaving direction, at a rest position and wherein the opposing rear and front race, the faces of the connection portion, and the support portion are convexly curved toward the direction of shaving at the rest position.

2. The razor blade cartridge according to claim 1, wherein the cutting edge protrudes in a circular shape and distributes a cutting pressure when hair is cut.

3. The razor blade cartridge according to claim 1, wherein a distance from a central portion of the cutting edge to the straight line connecting opposite ends of the cutting edge ranges between 0.01 mm and 2.0 mm.

4. The razor blade cartridge according to claim 1, wherein a distance from a central portion of the cutting edge to the straight line connecting opposite ends of the cutting edge is 0.2 mm.

5. The razor blade cartridge according to claim 1, wherein the cutting edge protrudes in a circular shape and a radius of the circle ranges between 210 mm and 220 mm.

6. The razor blade cartridge according to claim 1, wherein a thickness of the razor blade ranges between 0.075 mm and 0.2 mm.

7. A shaving razor blade cartridge comprising: a housing; and a plurality of razor blades wherein each blade comprises an edge that is elongated in a direction orthogonal to a shaving direction and which includes a curved cutting edge formed in a single arch and opposing rear and front faces, wherein the cutting edge extends along a longitudinal direction which is orthogonal to the shaving direction; a connection portion extending and bent from the edge portion toward a direction orthogonal to a longitudinal direction and orthogonal to the shaving direction, the connection portion having faces continuous with the front and rear faces of the edge portion, and a support portion extending from the connection portion in the direction orthogonal to both the longitudinal direction and the shaving direction wherein the edge, the connection portion and the support portion are a single body, and wherein the single body remains fixed in a state where: the cutting edge extends along the longitudinal direction which is orthogonal to the direction of shaving, a middle portion of the cutting edge is convexly curved toward the shaving direction from a straight line connecting opposite ends of the cutting edge and the cutting edge is convexly curved toward the direction orthogonal to both the longitudinal direction and the shaving direction, at a rest position, and wherein the opposing rear and front face, the faces of the connection portion, and the support portion are convexly curved toward the direction of shaving at the rest position.

8. The shaving razor cartridge according to claim 7, wherein the plurality of razor blades comprises two to ten razor blades.

9. The shaving razor cartridge according to claim 7, wherein a distance from the first razor blade to the last razor blade of the plurality of the razor blades ranges between 1.0 mm and 8.0 mm.

10. The shaving razor cartridge according to claim 7, wherein a distance between the plurality of razor blades ranges between 0.5 mm and 0.9 mm.

11. The shaving razor blade cartridge according to claim 7, wherein the cutting edge protrudes in a circular shape and distributes a cutting pressure when hair is cut.

12. The shaving razor cartridge according to claim 7, wherein a distance from a central portion of the cutting edge to the straight line connecting opposite ends of the cutting edge ranges between 0.1 mm and 2.0 mm.

13. The shaving razor cartridge according to claim 7, wherein a distance from a central portion of the cutting edge to the straight line connecting opposite ends of the cutting edge is 0.2 mm.

14. The shaving razor cartridge according to claim 7, wherein a thickness of the razor blade ranges between 0.075 mm and 0.2 mm.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 illustrates a conventional shaving razor.

(2) FIG. 2 illustrates a conventional shaving razor cartridge.

(3) FIG. 3 is a sectional view of the shaving razor cartridge taken along line A-A in FIG. 2.

(4) FIG. 4 is a perspective view of a razor blade according to the present invention.

(5) FIGS. 5 to 7 are enlarged views of the razor blade in FIG. 4.

(6) FIG. 8 illustrates a shaving razor cartridge according to the present invention.

(7) FIG. 9 is a graph which shows a strength test result of the razor blade according to the present invention and the conventional razor blade.

BEST MODE

(8) Hereinafter, a detailed structure of a razor blade according to exemplary embodiments of the present invention will be described with reference to accompanying drawings.

(9) FIG. 4 illustrates a razor blade according to an exemplary embodiment of the present invention.

(10) Referring to FIG. 4, a razor blade 40 includes an edge portion 42 including a cutting edge 422 to cut hair, a connection portion 44 extending from the edge portion 42, and a support portion 46 extending from the connection portion 44 and supporting the razor blade 40, wherein the edge portion 42, the connection portion 44 and the support portion 46 are combined into a single body.

(11) FIG. 5 is an enlarged view of a part A in FIG. 4. FIG. 6 is an enlarged view of the edge portion 42. FIG. 7 is a plan view of the razor blades 40.

(12) As shown in FIG. 6, the edge portion 42 has a front portion 424 which is convex, and a rear portion 426 which is concave. If the razor blade is curved as above, the pressure applied to the cutting edge of the razor blade at the time of shaving is distributed and the razor blade can maintain its strength even in a thinner thickness to thereby prevent a deformation of the razor blade.

(13) As shown in FIG. 7, if the force F is applied to the cutting edge 422, the forces Fu and Fd are distributed up and down along a curved surface, and thus the razor blade may maintain its strength even in a thinner thickness.

(14) In FIG. 5, as the cutting edge 422 has a curved structure and the central portion of the razor blade protrudes, measures a and d are formed. Such measures depend on the entire length of the razor blade 40, and may range between 0.01 mm and 2.0 mm. If the razor blade 40 is 37.26 mm in length, the length of a and d is preferably about 0.2 mm. If a virtual starting point is set, a radius is 216.95 mm.

(15) A distance from the cutting edge 422 to the support portion 46, i.e., a width b of the razor blades 40 may range between 1.0 mm and 3.0 mm, and preferably 1.8 mm. A height c of the razor blades 40 may range between 1.5 mm and 5.0 mm, and preferably 2.5 mm. A thickness e of the razor blades 40 may range between 0.05 mm and 0.2 mm, and preferably 0.075 mm.

(16) The connection portion 44 may form an angle ranging between 90 and 170, and preferably 112.

(17) As described above, if a razor blades are used, the gap between the razor blades 40 preferably ranges between 0.5 mm and 0.9 mm. Since the razor blades are thin, such gap is enough to prevent the deterioration of the shaving performance and to remove the shaving remainder without difficulty.

(18) That is, if the razor blades 40 are shaped into a curved surface as above, the thickness of the razor blades 40 may be thinner, and the gap between the razor blades 40 in a shaving razor having a plurality of razor blades may be narrowed and a remainder discharger of a shaving razor cartridge which discharges such remainder to the rear portion r thereof may be ensured.

(19) FIG. 8 illustrates a shaving razor cartridge 60 in which the razor blades as above are mounted.

(20) Referring to FIG. 8, the shaving razor cartridge 60 includes a housing 62, a guard rubber 64, a lubricant band 66, a clip 68, and the razor blades 40.

(21) The housing 62 forms an external appearance of the shaving razor cartridge 60, and provides a structure to install the razor blades 40 therein. The housing 62 accommodates therein the guard rubber 64, the lubricant band 66 and the clip 68. The material of the housing 62 according to the present exemplary embodiment includes plastic, but not limited thereto, and may further include wood, metal or the like.

(22) The guard rubber 64 is formed adjacently to the cutting edge of the razor blades 40, and allows the hair to stand so that the razor blades 40 cut the hair without difficulty.

(23) The lubricant band 66 is installed in an opposite direction of the cutting edge of the razor blades 40 for the purposes of securing moisture of the skin and of smoothing the skin. The lubricant band 66 may include chamomile, olive, or allantoin ingredient so that a user may have a feeling of freshness after shaving.

(24) The clip 68 is used to prevent the razor blades 40 from being separated from the housing 62.

(25) FIG. 9 illustrates a performance test result of the razor blades according to the present invention and the conventional razor blades.

(26) The razor blade according to the present invention is 0.075 mm in thickness (according to a first exemplary embodiment) and 0.1 mm (according to a second exemplary embodiment), and the conventional razor blade was products (product 1 and product 2) manufactured by company G currently sold in the market.

(27) The test devices was Instron 5542 test machine of Instron.

(28) In the graph, an abscissa refers to a degree of pressing the razor blade in the unit of mm and an ordinate refers to the force applied.

(29) Referring to FIG. 9, the strength of the razor blade according to the first and second exemplary embodiments of the present invention is weaker than the product 2, but stronger than the product 1 of the company G. That is, even if the cutting edge and the supporter of the razor blade according to the present invention are combined into a single body unlike the conventional razor blade, the razor blade according to the present invention is stronger than the product 1 and is sufficient to be used as a razor blade.

(30) The razor blade according to the present invention is weaker than the product 2, but is thin and excludes an additional razor blade supporter. In consideration of the foregoing, the razor blade according to the present invention is much stronger than the conventional razor blade. The products 1 and 2 are 0.15 mm or more in thickness.

(31) Table 1 below shows repetitive test data.

(32) TABLE-US-00001 TABLE 1 1.sup.st 2.sup.nd exemplary exemplary Item Product 1 Product 2 embodiment embodiment 1 260 780 210 160 2 240 650 170 240 3 240 650 330 300 4 220 680 330 400 5 240 680 280 470 Average 240 688 264 314 Standard 14.1 53.6 72.0 123.6 deviation

(33) As in Table 1 above, the razor blade according to the present invention endures more load than the product 1 from company G and is strong enough to be used as a razor blade.

(34) As described above, a razor blade according to the present invention is formed in a single body to thereby reduce manufacturing processes and realize a strength enough to be used as a razor blade.