Unitary razor blade and shaving razor cartridge using same

Patent metadata

Field	Value
Publication number	US-10486322-B2
Application number	US-201715845331-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Feb 11, 2009
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A razor blade cartridge includes: a housing: a razor blade fixedly mounted in the housing including: an edge that is elongated in a direction orthogonal to 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 shaving direction; a connection portion extended and bent from the edge 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 respectively; 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 and the connection portion, the connection portion and the support portion are a single body.

First claim

What is claimed is:

1. A razor blade cartridge comprising:
a housing:
a plurality of blades fixedly mounted in the housing, each blade including:
an edge portion that is elongated in a longitudinal direction orthogonal to a shaving direction;
a cutting edge extending along the longitudinal direction wherein the cutting edge is directed toward the shaving direction to cut hair in the shaving direction;
opposing rear and front faces;
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, respectively; 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 connection portion and the support portion are a single body and the single body remains fixed in a state where the cutting edge of each blade of the plurality of blades is convexly curved toward the shaving direction from a straight line connecting opposite ends of the cutting edge at a rest position, and
wherein the cutting edge of each blade of the plurality of blades has a same degree of convex curvature towards the shaving direction at the rest position.

2. The razor blade cartridge according to claim 1 , wherein the cutting edge protrudes in a circular shape.

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 for each of the plurality of blades.

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 for each of the plurality of blades.

5. The razor blade cartridge according to claim 1 , wherein a thickness of each of the plurality of blades is the same and ranges between 0.075 mm and 0.2 mm.

6. A razor blade cartridge comprising:
a housing;
a plurality of blades wherein each blade comprises: an edge portion that is elongated in a longitudinal direction orthogonal to a shaving direction; a cutting edge extending along the longitudinal direction wherein the cutting edge is directed toward the shaving direction to cut hair in the shaving direction; and opposing rear and front faces;
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, respectively; 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 portion, 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 of each blade of the plurality of blades is convexly curved toward the shaving direction from a straight line connecting opposite ends of the cutting edge at a rest position, and
wherein the cutting edge of each blade of the plurality of blades has a same degree of convex curvature towards the shaving direction at the rest position.

7. The razor blade cartridge according to claim 6 , wherein the plurality of razor blades comprises two to ten razor blades.

8. The razor blade cartridge according to claim 6 , wherein a distance from a first razor blade to a last razor blade of the plurality of the razor blades ranges between 1.0 mm and 8.0 mm.

9. The razor blade cartridge according to claim 6 , wherein a distance between each of the plurality of razor blades ranges between 0.5 mm and 0.9 mm.

10. The razor blade cartridge according to claim 6 , wherein the cutting edge protrudes in a circular shape.

11. The razor blade cartridge according to claim 6 , 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 for each of the plurality of blades.

12. The razor blade cartridge according to claim 6 , 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 for each of the plurality of blades.

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

14. The razor blade cartridge according to claim 6 , further comprising guard rubber disposed on the housing adjacent to the plurality of blades.

15. The razor blade cartridge according to claim 6 , further comprising a lubricant band disposed on the housing adjacent to the plurality of blades and positioned opposite a leading blade of the plurality of blades.

16. The razor blade cartridge according to claim 6 , further comprising a clip configured to secure the plurality of blades to the housing.

17. The razor blade cartridge of claim 1 , wherein the convexly curved cutting edge of each of the plurality of blades is configured to distribute a cutting pressure along the convex curvature of the blade when hair is cut.

18. The razor blade cartridge of claim 6 , wherein the convexly curved cutting edge of each of the plurality of blades is configured to distribute a cutting pressure along the convex curvature of the blade when hair is cut.

Assignees

• Dorco Co Ltd

Inventors

• Park Young Ho
• Kim Su Hwan
• Ahn Byung Sun

Classifications

• A47L1/15 Primary

  Cloths, sponges, pads, or the like, e.g. containing cleaning agents · CPC title

• B26B21/565 Primary

  Bent razor blades; Razor blades with bent carriers · CPC title

• B26B21/28

  of the drawing cut type, i.e. with the cutting edge of the blade arranged obliquely {or curved} to the handle · CPC title