A tool having a first portion defining a housing for receiving a second portion mobile in rotation between a first inactive position and a second active position, said tool equipped with at least one locking device in at least one position of said second portion, said device having a portion pivoting about a shaft perpendicular to its largest dimension between at least one position where one end of the second portion is engaged in a notch formed in the end of the first portion, and another position where it is disengaged from said notch, said part being configured for a return to the inactive position by at least one return member, at least the elongated part, its pivot shaft and the at least one return member being cutout in the first portion.

A double spring folding knife includes a handle having a curvilinear groove on an interior surface, and a knife blade. The knife blade has a locking pin that extends away from a first side of the knife blade and is configured to slidingly engage the curvilinear groove. A bow spring is fixed to the handle and is orientated to interact with the locking pin in order to exert a force on the locking pin during a portion of travel along the curvilinear groove. The knife also includes a coil spring having a first end fixed to the handle and a second end fixed to a second side of the knife blade, where the coil spring is configured to exert an opening force on the knife blade after the locking pin has traveled past the bow spring along the curvilinear groove.

Disclosed is a foldable cutter with a locking structure, including a cutter head having a blade and a connecting portion. The locking structure is rotatablely connected with the connecting portion. The locking structure includes a rotation shaft; at least two elastic check pawls arranged in the connecting portion; at least one gasket arranged on the connection portion, and provided with a second shaft hole matching with the rotation shaft, and a crescent gear groove extending around the second shaft hole; and at least one bidirectional unlocking rotor disc arranged on the gasket or on the connection portion, and provided with a third shaft hole matching with the rotation shaft, and a profiled hole.

The present invention discloses a utility knife, which includes a housing that has an internal chamber; a blade carrier for carrying a single blade; a locking piece for locking the single blade in the blade carrier; and a spare blade cartridge for storing more than one spare blade. The blade carrier, the locking piece and the spare blade cartridge are arranged in the internal chamber. The blade carrier is arranged to be movable between a first position and a second position, and when the blade carrier is at the first position, the blade carried by the blade carrier extends out of the housing, when the blade carrier is at the second position, the blade carried by the blade carrier retracts into the housing.

Folding knife embodiments are disclosed herein comprising a blade operable to pivot relative to a handle, between an open position and a closed position, a blade-locking member disposed in the handle and being moveable in a first direction between an unlocked position and a locked position to retain the blade in at least one of the open or closed positions. The folding knife may further comprise a safety member mounted on the blade-locking member and being moveable relative thereto in a second direction between a release position and a safety position. Wherein when the safety member is in the safety position, the safety member and the blade-locking member are blocked from moving in the first direction, and wherein when the safety member is in the release position, the safety member and the blade-locking member can be moved in the first direction to move the blade-locking member to the unlocked position.

A folding knife is described herein. The folding knife includes a release actuator that provides three knife positions: a secured closed position, a secured open position, and an intermediate unsecured position in between the two secured positions, and that opens and closes the folding knife easily and safely. A triple-purpose pivot ring provides an index finger grip, an attachment point, and a pivoting mechanism. The release actuator allows for one-handed operation. A blade holder comprises a blade lock that has two positions, one of which locks the blade into position in the blade holder, while the other position unlocks it. The blade lock may be a push button that unlocks the blade while pressing it down, and that automatically return the lock into its locked position by action of a spring, in particular a leaf spring.

A knife assembly, having a blade rotationally engaged therewith, is provided. The assembly is positionable within a handle cavity of a knife handle. The blade is rotatable from a closed position located within a member cavity between two side members to an open position. Spring members formed into the side members deflect within a slot defining them to provide a biasing force to hold a cross bar engaged therewith in either a first indent or second indent on the blade, to hold the blade in the open or closed position. The cross bar is out of contact with the blade in a rear surface edge in between the two detents to allow for easy movement between the open and closed positions.

A knife includes a knife body having two liners and a blade positioned between the two liners. The knife further includes two scales, each scale being removably coupled to one of the two liners. Each scale is configured for use as a tool separate from the knife body when removed from the knife body. A bottle opener may be formed in the knife body.

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.

The present invention is to provide a folding knife with a locking function comprising a handle, a blade pivotally connected to an end of handle through a pivot pin, a poke member and a first elastic component; wherein blade includes a locking pin protruded adjacent to pivot pin; e poke member includes a poke part at an end thereof and exposed out of handle. The other end of poke member is pivotally connected between pivot pin and the other end of handle. Poke member includes a locking slot recessed adjacent to a middle section thereof and facing pivot pin. first elastic component includes an end abutted against the middle section, and the other end fixed between poke member and the other end of handle, for applying an elastic force on poke member, so as to ensure locking pin to be engaged into locking slot, when blade is received inside handle.