Patent ID: 7694422

Claim:
A knife comprising: (a) a body including a blade head at one end and demountable roller at the other end; (b) the blade head including a planar first guide cheek and planar second guide cheek, positioned at an angle, alpha relative a blade which is received between the first and second guide cheeks; (c) a means for urging said blade between a retracted position and an extended position; (d) further including a means for demountably attaching said roller to a roller end of said knife body; (e) wherein the roller further including a right wheel half and a left wheel half such that the roller being comprised of two halves in intimate contact with each other; (f) wherein each wheel half including a planar small face and a planar large face and a chamfered surface; (p) wherein the wheels being selectively mountable in a pointed position or in a grooved position wherein the wheels in a pointed position the larger faces are mounted in contact with each other and when wheels in a grooved position the small faces are mounted in contact with each other.