A folding knife including a blade assembly; a first plate; a first member; a spacer connected to a first end of the first member; and a first button connected to the first member between the first end of the first member and an opposing second end of the first member; wherein the spacer is configured to be inserted into a slot of the blade assembly to lock the blade assembly into an open orientation with respect to the first plate. The first member is configured to be rotated with respect to the first plate by the first button to allow the blade assembly to be unlocked. The first plate has an arcuate slot; wherein the arcuate slot is located closer to a first end of the first plate than to a second end; and wherein the first button is located between the arcuate slot and the second end.

A self-defense pocket knife with handle of suitable proportion to be grasped in closed fist and a conveyance system configured for the emergency manual conveyance of a blade from a position for storage to a position for use without requiring the user to appreciably alter or compromise grip upon the handle during the course of such conveyance.

Knives having removable blades are described. Such a knife includes a handle; and a blade removably connected to the handle. The blade includes a blade portion and a carrier portion. The carrier portion of the blade includes a cam slot and the handle includes a cam pin which enable the blade to be removably connected to the handle.

A knife allowing rapid and safe replacement and securement of a blade which can be fixed to a front end of a connecting base of the knife. The connecting base has a rear end that can be connected to a handle, and includes an upper base body, a lower base body, a lock-release member, and a spacer plate that can be located between the upper and lower base bodies and form an engaged-connection groove along with the base bodies therebetween. The engaged-connection groove matches, and enables the insertion therein and engagement therewith, a portion of the blade at or adjacent to the rear end thereof. The lock-release member can be arranged on the connecting base for a user to set the blade into a locked state, in which the blade is securely positioned and cannot be detached, or an unlocked state, in which the blade can be detached.

A self-defense pocket knife with handle of suitable proportion to be grasped in closed fist and a conveyance system configured for the emergency manual conveyance of a blade from a position for storage to a position for use without requiring the user to appreciably alter or compromise grip upon the handle during the course of such conveyance.

A folding knife includes a handle, a first liner inside the handle, and a second liner inside the handle and opposed to tire first liner. A blade has a tang and a cutting edge, and the tang of the blade pivotally connects the blade between the first and second liners. The blade has a retracted position in which the cutting edge is inside the handle and a deployed position in which the cutting edge is outside the handle. An actuator is at least partially between the first and second liners. A screw inside the handle has a first end opposed to a second end. The first end of the screw is engaged with the first liner, and the second end of the screw is threadingly engaged with the second liner.

Folding knife embodiments are disclosed herein comprising a blade operable to pivot relative to a handle, between an open position and a closed position, about a pivot axis extending through a tang portion of the blade having at least one locking recess. The knife can have a locking mechanism comprising a rod that extends along the pivot axis through the tang portion and a locking member coupled to the rod which engages the at least one locking recess of the tang portion when the blade is in at least one of the open position or the closed position. The knife can further comprise a push button coupled to the rod, wherein depression of the push button is configured to eject the locking member from the locking recess in the blade, thereby unlocking the blade.

A folding knife includes a handle having a pivot axis, a blade attached to the handle, a movable member that moves about the pivot axis, an urging spring, and a switching mechanism. The movable member has an engaging claw. When the blade is in a folded position, the switching mechanism holds the movable member in a disengaged state, in which the engaging claw is disengaged from an engaging portion of the blade. When the blade moves from the folded position to the switching position, the switching mechanism switches the movable member from the disengaged state to an engaged state, in which the engaging claw is engaged with the engaging portion, thereby moving the movable member in the open direction by the urging spring to move the blade from the switching position toward the open position by the movable member.

The present invention first provides a utility knife with a replaceable blade, comprising a knife handle, a blade holder, a blade and a locking device that locks the blade in the blade holder. The blade holder and the blade are enabled to switch between a first position and a second position. When the blade holder and the blade are in the first position, the blade is used for cutting operation, and when the blade holder and the blade are in the second position, both the blade holder and the blade are received in the knife handle. The utility knife further includes a restriction means which is thus arranged as, when the blade holder is in the second position and the locking device is in unlocked state, the restriction means is used for preventing the detachment of the blade from the blade holder by confining the movement of the blade relative to the blade holder. The present invention also provides a folding utility knife with a replaceable blade and a retractable utility knife with a replaceable blade, and a utility knife with multiple tools and replaceable blades.

A combination pocket device (FIG. 8) is provided for holding a knife blade that pivots between a closed position where it lives inside the body of the device, and an extended position where it extends co-linear with the body in a locked state. The blade is held in position by a lock-back mechanism. The keys are held together by a bolt on one side of the blade and lives inside the body as well. The keys fold in opposite position of the blade, into one organized and compact unit.