A pivoting shaft extending in a first direction is combined with the first pivoting member and the second pivoting member. The blade structure or the handle structure can be turned about the first direction to be switched between an unfolded working state and a folded storage state; and a locking and unlocking structure disposed in a first accommodation space of the handle structure, and rotatable about the second direction. The locking and unlocking structure is rotated to a first position to be in contact with a first part of the blade structure to secure the blade structure in the unfolded working state, and rotated to a second position different from the first direction to have a retracting part facing a second part of the blade structure, wherein the second part of the blade structure can pass the retracting part of the locking and unlocking structure to enter the folded storage state.

A self-defense pocket knife with handle of suitable proportion to be grasped in closed first 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 hand tool assembly having a foldable implement, such as a blade, and a retractable attachment clip having an actuator is disclosed. A retracting assembly may be coupled to the attachment clip; the hand tool assembly may include a rotatable cam assembly comprising a rotatable cam coupled to a rotatable cam arm having a lifter; the rotatable cam may be coupled to the implement; the rotatable cam may have an off-center rotational axis; when a user rotates the implement, the rotatable cam may also be rotated, causing the position of the lifter to be moved a distance, thereby causing movement of the actuator of the attachment clip thereby actuating movement of the extendable, retractable attachment clip; the foldable hand tool may include a locking assembly having a spine having lug element and a first tooth configured to detachably mate with a first tooth-receiving slot of the implement.

A hand tool assembly having a foldable implement, such as a blade, and a retractable attachment clip having an actuator is disclosed. A retracting assembly may be coupled to the attachment clip; the hand tool assembly may include a rotatable cam assembly comprising a rotatable cam coupled to a rotatable cam arm having a lifter; the rotatable cam may be coupled to the implement; the rotatable cam may have an off-center rotational axis; when a user rotates the implement, the rotatable cam may also be rotated, causing the position of the lifter to be moved a distance, thereby causing movement of the actuator of the attachment clip thereby actuating movement of the extendable, retractable attachment clip; the foldable hand tool may include a locking assembly having a spine having lug element and a first tooth configured to detachably mate with a first tooth-receiving slot of the implement.