Patent ID: 8931180
Filing Date: 2015-01-13
Classification: B26B

Abstract:
1. A knife comprising: a housing; a blade comprising a cutting edge adapted to engage a material, the blade coupled to a blade shuttle, the blade and blade shuttle substantially enclosed within the housing when the blade shuttle is in a retracted position, the blade extended from the housing when the blade shuttle is in an extended position, the blade shuttle adapted to be conveyed to the retracted position upon decoupling of the blade shuttle from a blade trigger through a blade transmission based on the blade receiving a force on, and directed substantially perpendicular to, the cutting edge from the material, and based on a frictional force between the blade and the material that is less than a spring force exerted on the blade shuttle from a shuttle spring; the blade trigger pivotally coupled to the housing, the blade shuttle conveyed from the retracted position to the extended position when the blade trigger pivots from a rest position to an engaged position where the blade trigger is at least partially enclosed within the housing; and a trigger lock that comprises a trigger spring positioned between a trigger lock and the blade trigger to urge the trigger lock from an unlocked position to a locked position, wherein the shuttle spring is coupled to the blade shuttle and adapted to convey the blade shuttle to the refracted position, the shuttle spring adapted to automatically convey the blade shuttle to the retracted position upon disengagement of the blade from the material when the blade trigger is in the engaged position.