Folding knife with opening and closing assistance
OwnerMatthew J. Lerchinventor
Life of this patent
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Abstract
A folding knife with opening and closing assistance preferably includes a blade, a first frame, a second frame, a coil spring, an open lock pin and a closed lock pin. One end of the blade is pivotally retained between one end of the first and second frames. The open lock pin is preferably retained in the second frame. An open lock notch is formed in a first end of the blade such that the blade may be locked in an open position with the open lock pin. The closed lock pin is radially spring loaded between the first and second frames. A closed lock notch is formed in the first end of the blade to receive the closed lock pin. The blade is locked in a closed position, when the closed lock pin is retained in the closed lock notch.
Claims18
A method of providing a folding knife, comprising the steps of:
- connecting pivotally a blade to at least one of a first frame and a second frame;
- providing at least one substantially U-shaped torsion spring, securing one end of said at least one substantially U-shaped torsion spring to at least one of said first and second frames, extending a pin from the other end of said at least one substantially U-shaped torsion spring;
- forming a first notch in a first end of said blade, said first notch engaging said pin and retaining said blade in a closed position;
- and
- forming a second notch adjacent said first notch, said second notch engaging said pin and retaining said blade in a substantially closed position.
A method of providing a folding knife, comprising the steps of:
- connecting pivotally a blade to at least one of a first frame and a second frame;
- biasing said blade to open with a coil spring;
- providing a first substantially U-shaped torsion spring and a second substantially U-shaped torsion spring, securing one end of said first substantially U-shaped torsion spring to said first frame, securing one end of said second substantially U-shaped torsion spring to said second frame, extending a pin from the other ends of said first and second substantially U-shaped torsion springs;
- forming a first notch in a first end of said blade, said first notch engaging said pin and retaining said blade in a closed position;
- and
- forming a second notch adjacent said first notch, said second notch engaging said pin and retaining said blade in a substantially closed position.
A method of providing a folding knife, comprising the steps of:
- connecting pivotally a blade to at least one of a first frame and a second frame;
- providing a first torsion spring and a second torsion spring, securing one end of said first torsion spring to said first frame, securing said second torsion spring to said second frame, extending a pin from the other end of said first and second torsion springs;
- forming a first notch in a first end of said blade, said first notch engaging said pin and retaining said blade in a closed position;
- and
- forming a second notch adjacent said first notch, said second notch engaging said pin and retaining said blade in a substantially closed position.
Dependencies are inferred from the claim text.