Patent ID: 8393084

Claim:
A device including: a cutting blade and a counter-blade, each one of the blades comprising a hole; a threaded bolt which passes through the holes of the cutting blade and the counter blade to hinge the cutting blade and counter-blade together; and a tightening nut; wherein said tightening nut is a single unitary piece and further comprises a first threaded hole in which one end of the bolt is screwed, a second threaded hole, which runs perpendicular to the first threaded hole, a lateral locking screw being screwed in the second threaded hole, and a through slit, in communication with the first threaded hole, that extends from the first threaded hole through the second threaded hole to an outer edge of the nut, such that, when the lateral locking screw is screwed into the second threaded hole, an opening and a diameter of the first threaded hole is reduced allowing the threads of the bolt to interact with the threads of the first threaded hole.