Cutting members for shaving razors
View Patent ↗Cutting members for razors are provided that have been subjected to a localized heat-treating process, e.g., application of laser energy. In some cases, the cutting members include a bent portion, and the localized heat-treating process is used to enhance ductility and thereby facilitate formation of the bent portion.
1. A cutting member for a shaving razor, the cutting member comprising:
a blade portion and a base portion, the blade portion having a cutting edge region terminated at a free end thereof and an opposing non-cutting edge region, the blade portion being bent relative to the base portion in a bent portion spaced from the cutting edge region and adjacent to the non-cutting edge region, wherein the bent portion extends about 108 degrees to about 115 degrees from the base portion, the bent portion having a radius of about 0.30 mm to about 0.45 mm, at least part of the cutting member has an average thickness of at least 0.076 mm and a hardness of about 540 HV to about 750 HV, and a thickness of the bent portion is less than the average thickness of the cutting member and the thickness of the bent portion is less than a thickness of the base portion and a thickness of the non-cutting edge region.
2. The cutting member of claim 1 , wherein the thickness of the bent portion is about 5 percent to about 10 percent less than the thickness of the base portion and the thickness of the non-cutting edge region.
3. The cutting member of claim 1 , wherein the thickness of the bent portion is about 5 percent to about 10 percent less than the average thickness of the cutting member.
4. The cutting member of claim 1 , wherein the blade portion has a bow of about +0.01 mm to about −0.05 mm across a length of the blade portion.
5. The cutting member of claim 1 , wherein the base portion has a bow of about +/−0.060 mm across a length of the base portion.
6. The cutting member of claim 1 , wherein the blade portion has a sweep of about +/−0.07 mm across a length of the blade portion.
7. The cutting member of claim 1 , wherein the bent portion has a ductility of about seven percent to about 12 percent elongation.
8. The cutting member of claim 7 , wherein the bent portion has a ductility of about nine percent to about 10 percent elongation.
9. The cutting member of claim 1 , wherein the blade portion has a length of about 0.82 mm to about 1.49 mm
10. The cutting member of claim 1 , wherein the base portion has a length of about 2.22 mm to about 2.36 mm
11. The cutting member of claim 1 , wherein the cutting edge region has a wedge-shaped configuration with an ultimate tip radius less than about 1000 angstroms.
12. The cutting member of claim 11 , wherein the ultimate tip radius is about 200 angstroms to about 300 angstroms.
13. A cutting member for a shaving razor, the cutting member comprising:
a blade portion and a base portion, the blade portion having a cutting edge region terminated at a free end thereof and an opposing non-cutting edge region such that a length of the blade portion is about 0.82 mm to about 1.49 mm, the base portion having a length of about 2.22 mm to about 2.36 mm, the blade portion being bent relative to the base portion in a bent portion spaced from the cutting edge region and adjacent to the non-cutting edge region, wherein the bent portion extends about 108 degrees to about 115 degrees from the base portion, the bent portion having a radius of about 0.30 mm to about 0.45 mm, at least part of the cutting member has an average thickness of at least 0.076 mm and a hardness of about 540 HV to about 750 HV, and a thickness of the bent portion is less than a thickness of the base portion and a thickness of the non-cutting edge region.
14. The cutting member of claim 13 , wherein the thickness of the bent portion is about 5 percent to about 10 percent less than the thickness of the base portion and the thickness of the non-cutting edge region.
15. The cutting member of claim 13 , wherein the blade portion has a wedge-shaped configuration with an ultimate tip radius less than about 1000 angstroms.
16. The cutting member of claim 13 , wherein the blade portion has a bow of about +0.01 mm to about −0.05 mm across the length of the blade portion.
17. The cutting member of claim 13 , wherein the blade portion has a sweep of about +/−0.07 mm across the length of the blade portion.
18. The cutting member of claim 13 , wherein the base portion has a bow of about +/−0.060 mm across the length of the base portion.
19. The cutting member of claim 13 , wherein the cutting member is formed of a metal comprising about 0.35 percent to about 0.43 percent carbon, about 0.90 percent to about 1.35 percent molybdenum, about 0.40 percent to about 0.90 percent manganese, about 13 percent to about 14 percent chromium, no more than about 0.030 percent phosphorus, about 0.20 percent to about 0.55 percent silicon, and no more than about 0.025 percent sulfur.