A knife may include a blade having first and second blade ends. A blade point may be disposed at the second blade end. A spine may be disposed between the first blade end and the second blade end. A cutting edge may oppose the spine. A primary bevel may be disposed between the spine and the cutting edge. A secondary bevel may be disposed between the primary bevel and the cutting edge. The secondary bevel may include a secondary bevel start line parallel to the spine and along a first longitudinal axis. A ricasso may be positioned at the first blade end adjacent to the cutting edge, the ricasso including a ricasso angle assist bevel. The ricasso angle assist bevel may include a ricasso angle assist bevel start line along a second longitudinal axis, wherein the second longitudinal axis is closer to the spine than the first longitudinal axis.

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer contains a plurality of -Al.sub.2O.sub.3 crystal grains and chlorine, and has a TC(006) of more than 5 in texture coefficient TC(hkl). The -Al.sub.2O.sub.3 layer includes lower and upper layers, the lower layer is located closer to the base material than the upper layer is, and the upper layer is located opposite to the base material across the lower layer, in a thickness direction of the -Al.sub.2O.sub.3 layer. The lower layer has a thickness of 1.0 m. The upper layer has a thickness of 0.5 m or more. The chlorine in the lower layer has a concentration distribution in which an atomic concentration C.sub.Cl of the chlorine decreases in a direction away from the base material, in a thickness direction of the lower layer.

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer contains a plurality of -Al.sub.2O.sub.3 crystal grains and chlorine, and has a TC(006) of more than 5 in texture coefficient TC(hkl). The -Al.sub.2O.sub.3 layer includes lower and upper layers, the lower layer is located closer to the base material than the upper layer is, and the upper layer is located opposite to the base material across the lower layer, in a thickness direction of the -Al.sub.2O.sub.3 layer. The lower layer has a thickness of 1.0 m. The upper layer has a thickness of 0.5 m or more. The chlorine in the lower layer has a concentration distribution in which an atomic concentration C.sub.Cl of the chlorine decreases in a direction away from the base material, in a thickness direction of the lower layer.

A method for forming a cutting tool includes masking a metal base with one or more masks, the one or more masks including at least one variable permeability mask, and chemically etching the masked metal base to form a blade of the cutting tool.

A method for forming a cutting tool includes masking a metal base with one or more masks, the one or more masks including at least one variable permeability mask, and chemically etching the masked metal base to form a blade of the cutting tool.

A cutlery implement or cutting instrument having a blade with opposed side surfaces, a knife edge extending along one terminal edge of the blade, and a narrow continuous longitudinally extending ridge of either hemispherical cross-sectional shape or rectangular cross-sectional shape extending along a pre-determined length of the knife edge at a pre-determined continuous spaced distance from the knife edge. The rectangular cross-sectional shape includes fillets on each opposite side thereof for providing a smooth transition to the blade surface. The narrow longitudinally extending ridge protrudes from at least one or both of the opposed side surfaces of the blade.

A cutlery implement or cutting instrument having a blade with opposed side surfaces, a knife edge extending along one terminal edge of the blade, and a narrow continuous longitudinally extending ridge of either hemispherical cross-sectional shape or rectangular cross-sectional shape extending along a pre-determined length of the knife edge at a pre-determined continuous spaced distance from the knife edge. The rectangular cross-sectional shape includes fillets on each opposite side thereof for providing a smooth transition to the blade surface. The narrow longitudinally extending ridge protrudes from at least one or both of the opposed side surfaces of the blade.

The invention may include a knife having a syringe hub remover. In one embodiment, the invention may include a hub slot that may be integral to the knife tang and that may further be configured to be positioned over a syringe hub and allow for an improved leveraged torque force to be applied thereby twisting and ultimately assisting in the removal of the syringe hub.

The present invention discloses a method of manufacturing a tool with a cutting edge comprising a substrate for supporting and a cladding layer for forming the cutting edge, and a transition zone connecting the substrate and the cladding layer; the method of manufacturing it includes: providing a first material used for forming the substrate and having a first side; providing a second material which is clad onto the first side by way of laser cladding to form the cladding layer, and forming a transition zone between the cladding layer and the substrate where the first material and the second material are metallurgically bonded. The tool obtained by adopting the manufacturing process according to the present invention combines the following advantages: good toughness of the cutter body, high hardness of the cutting edge, not easy breaking off of the cutter body and the cutting edge, and long service life.

The present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacturing. More specifically, the present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacture which limit user exposure to associated cutting edges.