Cantilever spring assist knife
AssigneeFiskars Brands, Inc.
InventorJeff Freeman
Life of this patent
Estimating the term…
Abstract
A folding tool includes a handle and an implement pivotally coupled to the handle. The implement is adapted to travel between a closed position and an open position. The implement includes a tang having a contoured surface. The folding tool also includes a locking device movable between a locked position and an unlocked position along an axis that is transverse to a plane defined by the implement. The folding tool further includes a cantilever spring having a first end coupled to the handle and a second end adapted to interact with the tang of the implement. The spring exerts a closing force on the implement when the blade is in a closed position. The spring exerts an opening force on the implement during at least a portion of the travel of the implement between the closed position and the open position.
Claims19
A folding tool, comprising:
- a handle;
- an implement pivotally coupled to the handle, the implement adapted to travel between a closed position and an open position, the implement comprising a tang, wherein the tang includes a cutout defined in part by a hook-shaped arm;
- a locking device movable between a locked position and an unlocked position along an axis transverse to a plane defined by the implement, wherein the locking device secures the implement in the open position when the locking device is in the locked position, and wherein the locking device is positioned within the cutout in the tang when the implement is in the closed position;
- and
- a cantilever spring having a first end coupled to the handle and a second end adapted to interact with the tang of the implement, wherein the spring exerts a closing force on the hook-shaped arm of the implement when the implement is in the closed position, wherein the spring exerts an opening force on the hook-shaped arm of the implement during at least a portion of the travel of the implement between the closed position and the open position, and wherein the spring does not contact the implement when the implement is in the open position.
A folding knife, comprising:
- a handle;
- a blade pivotally coupled to the handle, the blade movable between a closed position and an open position, the blade having a tang and a thumb stud, the tang including a cutout defined in part by a hook-shaped arm, wherein contact between the handle and the thumb stud stops the blade in the open position;
- a locking device movable between a locked position and an unlocked position along an axis generally perpendicular to a plane defined by the blade, wherein the locking device secures the blade in the open position when the locking device is in the locked position, wherein contact between the tang and the locking device stops the blade in the closed position, and wherein the locking device is positioned within the cutout in the tang when the blade is in the closed position;
- and
- a spring located in the plane defined by the blade, the spring having a proximal end coupled to the handle and a distal end adapted to exert a force on the blade via contact with the tang.
A folding knife, comprising:
- a handle;
- a blade pivotally coupled to the handle, the blade movable between a closed position and an open position, the blade having a tang, the tang including an arm having a contoured surface, the arm in part defining a cutout;
- a locking device movable between a locked position and an unlocked position along an axis generally perpendicular to a plane defined by the blade, wherein the locking device secures the blade in the open position when the locking device is in the locked position, wherein the locking device is positioned within the cutout in the tang when the blade is in the closed position;
- and
- a spring located in the plane defined by the blade, the spring having a proximal end coupled to the handle and a distal end, wherein the distal end of the spring contacts the contoured surface of the arm to exert a closing force on the blade when the blade is in the closed position, and wherein the distal end of the spring does not contact the blade when the blade is in the open position.
Dependencies are inferred from the claim text.