A cutlery utensil that include a functional section and a handle. The handle can include a raised spine disposed on a first surface of the handle and having a height that varies from a first end of the handle in the direction of the functional section. At least one recessed channel can be formed in a second surface of the utensil, the second surface of the utensil being opposite the first surface of the utensil, wherein the recessed channel has a depth that varies from the first end of the handle in the direction of the functional section.

An interchangeable cutlery system comprises a blade handle incorporating a quick-change blade mechanism, and a plurality of blades removably attachable to the handle via the mechanism, wherein the plurality of blades are selected from a group consisting of a filet knife blade, a back-serrated fillet knife blade, a clip point knife blade, a gut hook knife blade, a saw blade, a fish scaler, a large bush craft blade, and multiple lengths thereof.

An interchangeable cutlery system comprises a blade handle incorporating a quick-change blade mechanism, and a plurality of blades removably attachable to the handle via the mechanism, wherein the plurality of blades are selected from a group consisting of a filet knife blade, a back-serrated fillet knife blade, a clip point knife blade, a gut hook knife blade, a saw blade, a fish scaler, a large bush craft blade, and multiple lengths thereof.

A multi-purpose bayonet knife assembly mounts to the distal end of a firearm barrel to augment the firearm as a pike and detaches to operate as a knife, while also providing integrated utilitarian components having minimal moving parts. The assembly comprises a hilt, a cross guard, and a blade. The hilt has an integral flint and a snap-on hook. The hook detachably couples to the firearm barrel, and also serves to open a bottle. A sleeve houses the hilt. The blade is defined by a longitudinally extending edge defined by: a first serrated edge, a second serrated edge, an angled bevel, and a double-sided blade tip oriented about 30 above the longitudinally extending edge of blade. Blade includes metric and imperial scales, time dial, and compass. Blade forms a dowel hole, nut socket holes, and a longitudinally extending groove. The metallic composition of the blade serves as an antenna.

A multi-purpose bayonet knife assembly mounts to the distal end of a firearm barrel to augment the firearm as a pike and detaches to operate as a knife, while also providing integrated utilitarian components having minimal moving parts. The assembly comprises a hilt, a cross guard, and a blade. The hilt has an integral flint and a snap-on hook. The hook detachably couples to the firearm barrel, and also serves to open a bottle. A sleeve houses the hilt. The blade is defined by a longitudinally extending edge defined by: a first serrated edge, a second serrated edge, an angled bevel, and a double-sided blade tip oriented about 30 above the longitudinally extending edge of blade. Blade includes metric and imperial scales, time dial, and compass. Blade forms a dowel hole, nut socket holes, and a longitudinally extending groove. The metallic composition of the blade serves as an antenna.

A bent knife is provided including a handle, a cutting head, and an engaging mechanism configured to removably couple a blade to the cutting head. The blade end of the handle can be tapered up the handle to a predetermined distance. The cutting head can include a housing coupled to a base. The housing can include a recess that can be configured to hold the blade between the housing and the base. The base can include a substantially flattened and a bent portion of the blade end portion of the handle. The bent portion of the base can include a curved portion or an angled bent portion. The engaging mechanism may include a pin configured to fit within a pin hole on the housing and within a reentrant opening on the blade and a leaf spring configured to fit within a depression on the recess. In addition, a method for assembling a bent knife is described herein which can include bending a tube to form a base end and a handle end. The housing may include a recess configured to hold a blade between the housing and the base. An engaging mechanism may be included in the cutting head, the engaging mechanism configured to removably couple a blade to the housing.

A bent knife is provided including a handle, a cutting head, and an engaging mechanism configured to removably couple a blade to the cutting head. The blade end of the handle can be tapered up the handle to a predetermined distance. The cutting head can include a housing coupled to a base. The housing can include a recess that can be configured to hold the blade between the housing and the base. The base can include a substantially flattened and a bent portion of the blade end portion of the handle. The bent portion of the base can include a curved portion or an angled bent portion. The engaging mechanism may include a pin configured to fit within a pin hole on the housing and within a reentrant opening on the blade and a leaf spring configured to fit within a depression on the recess. In addition, a method for assembling a bent knife is described herein which can include bending a tube to form a base end and a handle end. The housing may include a recess configured to hold a blade between the housing and the base. An engaging mechanism may be included in the cutting head, the engaging mechanism configured to removably couple a blade to the housing.

Various aspects of the present disclosure are directed toward blades having serrations, and methods for forming the serrations. As may be implemented in accordance with one or more embodiments, laser light is scanned across a surface of a knife blade in which the laser light is intersected with an edge thereof. The laser light is used to serrate the edge of the knife blade by generating heat in the knife blade while the laser light is scanned, melting portions of the knife blade at serration regions at the edge, and removing the melted portions. This approach may be carried out without registering an accurate location of the knife edge, and while also melting portions of the knife blade away from the edge.

Various aspects of the present disclosure are directed toward blades having serrations, and methods for forming the serrations. As may be implemented in accordance with one or more embodiments, laser light is scanned across a surface of a knife blade in which the laser light is intersected with an edge thereof. The laser light is used to serrate the edge of the knife blade by generating heat in the knife blade while the laser light is scanned, melting portions of the knife blade at serration regions at the edge, and removing the melted portions. This approach may be carried out without registering an accurate location of the knife edge, and while also melting portions of the knife blade away from the edge.

The present invention is directed generally to tools that are made, at least in part, more durable, particularly one or more working surface(s) of the tools. For example, various tools such as trowels, knives, and scrapers may be made having at least a portion of their blades heat treated to make at least their working edges more durable and extend their useful lives. For example, in various embodiments, a putty knife, taping knife, or scraper blade may have at least one working surface or edge that has been at heat treated while an area of the blade where a handle is permanently attached is not heat treated.