Patent ID: 8307556

Claim:
A knife comprising: a housing; a blade comprising a cutting edge adapted to engage a material, the blade coupled to a blade shuttle that comprises a spring tongue, 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 based on the blade receiving a force on, and directed substantially perpendicular to, the cutting edge; a blade trigger that comprises a rail and is 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; and a transmission adapted to transfer a rotational movement of the blade trigger as the blade trigger rotates from the rest position to the engaged position to a lateral movement directed to convey the blade shuttle from the refracted position to the extended position, the transmission comprising: at least one guide integrally formed in an interior surface of the housing; a lever coupled to the housing, the lever comprising at least one lever pin adapted to move along the rail as the blade trigger rotates from the rest position; and a drive arm coupled to the lever, the drive arm comprising a pin and a notch, the pin adapted to engage the guide and slide within the guide when the blade trigger rotates from the rest position, the notch adapted to engage the spring tongue when the blade trigger rotates from the rest position, the notch adapted to convey the blade shuttle from the retracted position to the extended position when the blade trigger rotates from the rest position to the engaged position.