Patent ID: 7036228

Claim:
A multifunctional knife device comprises: a main handle, a main blade having a tang inserted in the main handle, an auxiliary handle, an auxiliary blade having a serrated tang inserted in the auxiliary handle, a spring inserted in the main handle and the auxiliary handle, the main blade further having a back end, a tip end opposite the back end, and a plurality of round holes, wherein the tang is at the back end and has a round aperture, the auxiliary blade further having a circular aperture, a pivot bolt passing through the round aperture of the main blade and the circular aperture of the auxiliary blade to fasten the main blade and the auxiliary blade together, a nut engaging with the pivot bolt, the main handle having a slot, a serrated block inserted in the slot of the main handle, and the auxiliary handle having a notch to match the slot of the main handle, wherein the round holes of the main blade are located between the tip end and the tang of the main blade; the multifunctional knife device further comprises an insertion pin inserted into one of the round holes of the main blade and having a threaded post protruding from the respective round hole, and a threaded sleeve removably screwed onto the threaded post of the insertion pin and rested on the main blade; the insertion pin is secured on the main blade to function as a support of the main blade; when the tip end of the main blade penetrates a workpiece, the insertion pin is rested on a surface of the workpiece to function as a fulcrum of the back end of the main blade, so that the back end of the main blade is pivoted about the insertion pin to cut the workpiece by a leverage action of the main blade.