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 razor blade comprising an edge portion and a further portion, the edge portion having a cutting edge region terminated at a free end thereof and an opposing non-cutting edge region, the edge portion being bent relative to the further portion in a bending zone spaced from the cutting edge region and adjacent to the non-cutting edge region, characterized in that at least the edge portion has a material structure hardened by a heat treatment and in that the bending zone has a locally re-heated structure, wherein a thickness of the bending zone is less than that of the further portion and the non-cutting edge region.
2. The razor blade of claim 1 wherein the heat treatment used to harden the edge portion comprises a laser heat treatment.
3. The razor blade of claim 1 or 2 wherein the locally re-heated structure has been re-heated using laser energy.
4. The razor blade of claim 1 wherein the locally re-heated structure has a ductility of about nine percent to about ten percent.
5. The razor blade of claim 4 wherein the cutting edge region has a hardness of about 540 HV to about 750 HV.
6. A razor blade comprising an edge portion and a further portion, the edge portion having a cutting edge region terminated at a free end thereof and an opposing non-cutting edge region, the edge portion being bent relative to the further portion in a bending zone spaced from the cutting edge region and adjacent to the non-cutting edge region, characterized in that at least the edge portion has a material structure hardened by a heat treatment and in that the bending zone has a locally re-heated structure, wherein a thickness of the bending zone is less than that of the non-cutting edge region.
7. The razor blade of claim 6 wherein the heat treatment used to harden the edge portion comprises a laser heat treatment.
8. The razor blade of claim 6 or 7 wherein the locally re-heated structure has been re-heated using laser energy.
9. The razor blade of claim 6 wherein the locally re-heated structure has a ductility of about nine percent to about ten percent.
10. The razor blade of claim 9 wherein the cutting edge region has a hardness of about 540 HV to about 750 HV.