Abstract: A cutting tool including a housing provided with a compartment having an opening, a carrier disposed in the compartment and displaceable between extended and retracted positions, a spring for biasing the carrier in the retracted position, a mechanism for displacing the carrier in the extended position, a mechanism for releasably retaining the carrier in the extended position, and the carrier having a nesting surface for a blade whereby a blade nested thereon will project through the compartment opening when the carrier is in the extended position and will be disposed within such compartment when the carrier is in the retracted position.

Abstract: A retractable blade knife with an opening assisted mechanism has a handle, a blade mounted in the handle, an extending assembly mounted between the blade and the handle. At least one detent formed at a spine edge of the blade. The extending assembly has a positioning frame, a slider mounted beside the positioning frame and attached to the blade and a spring attached to the positioning frame and the slider. The positioning frame has a resilient rod selectively abutting the spine edge and a proximal end of the blade. The blade should be pushed manually a certain distance to allow the spine edge of the blade to push a rear end of the resilient rod outwardly. When the detent of the blade and a lock protrusion of the slider both depart from the resilient rod of the positioning frame, the spring may further pull the slider to move together with the blade to stretch out the blade.

Abstract: A sheath for an implement generally consisting of a housing provided with a recess in a surface thereof for removably receiving a portion of such implement, a light emitting device having an actuating button and a set of finger receiving openings wherein the housing is configured and the button is positioned relative to the set of openings so that the housing may be manually grasped by a user with the fingers of the user extending through the set of openings and the thumb of the user disposed in a position to facilitate the operation of the button.