Patent ID: 6874397

Claim:
A circular cutter comprising: a base unit including a base plate having a top face, and a bracket-mounting part that is integrally formed with said base plate as a single piece and that projects uprightly from said top face, said bracket-mounting part defining a first abutting face that is transverse to said top face, and being formed with an inner thread that extends in a transverse direction relative to said first abutting face; a pivot shaft extending in said transverse direction; a bracket pivoted to said bracket-mounting part through said pivot shaft so as to be rotatable about said pivot shaft, defining a second abutting face that confronts said first abutting face, and formed with an arcuate slot that is disposed adjacent to said inner thread; a cutter-holding arm mounted rotatably on said bracket; a friction-providing plate interposed between said first and second abutting faces; and a cutter-tilting lock including a screw rod that extends through said arcuate slot and said friction-providing plate in said transverse direction to threadedly engage said inner thread in such a manner that said friction-providing plate is tightly clamped between said first and second abutting faces when said screw rod is tightened, thereby preventing rotation of said bracket about said pivot shaft, and that said friction-providing plate is relieved from the clamping action when said screw rod is loosened, thereby permitting rotation of said bracket about said pivot shaft.