Abstract: A head-protector is described herein having a shell that is dimensioned to fit on the head of a user. The shell is formed with an opening to expose the face of the user. A locking mechanism attaches a lens to the shell and allows the lens to be pivoted between an operational position in which the lens covers the opening of the shell and a stowed position. Vents are established between an edge of the lens and the shell to establish an airflow over the inside surface of the lens to reduce fogging when the head-protector is subjected to an outside airflow such as wind. The vents can include a first vent that extends across the forehead of the user between the edge of the lens and the shell and a second vent that extends across the chin of the user between the edge of the lens and the shell.

Abstract: A skydiving helmet includes a lens for protecting the face of a skydiver during a skydiving event. An air-intake hole is formed on the helmet, and an airflow deflector plate is positioned against the air-intake hole. Thus, the deflector plate directs air over the inside surface of the lens to prevent fog from forming on this surface during a skydiving event.

Abstract: A lamina cutter includes a handle with a blade having a cutting edge mounted thereon. A guard member is affixed to the blade, and is positioned at a distance from the handle to establish a channel having a width “w” therebetween. The blade then extends between the handle and the guard member to present its cutting edge across the width of the channel. In use, a lamina (e.g. a sheet) having a thickness “t” (wherein “t”<“w”), is advanced through the channel and against the cutting edge to cut the lamina.

Abstract: A method for manufacturing a safety/rescue knife requires the forming of four blank laminates. Each blank laminate has a handle portion and includes a base arm which is attached to the handle portion. Also, each blank laminate has an extension arm which extends from the base arm to define a groove therebetween. One blank laminate is further formed with a cut out in its base arm, and another blank laminate is further formed with a cut out in its extension arm. The method then requires aligning each of the cut out laminates with a respective blank laminate to create blade recesses. Next, cutting blades are placed in the recesses, and the cut out laminates are juxtaposed in alignment. The blank laminates are then connected together to hold the inner laminates and the blades therebetween with the blades crossed to establish a cutting angle in the groove.