A knife has a first part and a second part movably engaged to the first part along a path between an open position in which a housing interior is accessible and a closed position. A holding surface is fixed on and jointly slidable with the second part, and a third part is fixable on the first part, An actuator is movable on the second part between an actuated position and an unactuated position. An arm integral with or fixed on the third part is operatively engaged by the actuator and displaced on movement of the actuator between the unactuated position and the actuated position between a locking position securing the second part in one of the open and closed positions and a release position.

The present application relates to a marking pen with an unpacking knife, which includes knife box fixed with the penholder, a first sliding groove is defined on an outer wall of the knife box, a sliding knife is slidably connected in the knife box, a driving rod is fixed on a sidewall of the sliding knife, the driving rod is slidably connected in the first sliding groove, a knife opening is provided on the outer wall of the knife box, the knife opening is in communication with an inner chamber of the knife box, a limiting block is fixed on an inner wall of the first sliding groove, an outer wall of the limiting block is configured to abut against an outer wall of the driving rod, and the knife box is provided with a driving member for driving the driving rod to slide.

The present application relates to a marking pen with an unpacking knife, which includes knife box fixed with the penholder, a first sliding groove is defined on an outer wall of the knife box, a sliding knife is slidably connected in the knife box, a driving rod is fixed on a sidewall of the sliding knife, the driving rod is slidably connected in the first sliding groove, a knife opening is provided on the outer wall of the knife box, the knife opening is in communication with an inner chamber of the knife box, a limiting block is fixed on an inner wall of the first sliding groove, an outer wall of the limiting block is configured to abut against an outer wall of the driving rod, and the knife box is provided with a driving member for driving the driving rod to slide.

A knife comprises an elongated frame defining a blade passage and having a forward opening at one end of the frame. An elongated blade is received in the frame and movable between an extended and a retracted position; and the blade has a point at a first end and having a first blade portion extending from the frame when the blade is in the retracted position and a greater end position extended from the frame when the blade is in the extended position.

A knife comprises an elongated frame defining a blade passage and having a forward opening at one end of the frame. An elongated blade is received in the frame and movable between an extended and a retracted position; and the blade has a point at a first end and having a first blade portion extending from the frame when the blade is in the retracted position and a greater end position extended from the frame when the blade is in the extended position.

A cold knife holder capable of pushing and pulling operations, includes a main body forming a chamber and a slot, a handle, a detent member, a first spring and a first steel ball. One side of the main body forms a perforation which communicates with the chamber. The handle includes a sleeve, a connecting rod and a grip rod. Both ends of the connecting rod are respectively connected to the sleeve and the grip rod, and the sleeve is pivotally sleeved on the main body, so that the handle is rotated relative to the main body, and the first or second caulking is connected to the perforation, and the detent member is arranged in the chamber. The first steel ball is pivotally embedded in the perforation, so that the detent member drives the first steel ball to be embedded in the first or second caulking, thereby positioning the handle.

A cold knife holder capable of pushing and pulling operations, includes a main body forming a chamber and a slot, a handle, a detent member, a first spring and a first steel ball. One side of the main body forms a perforation which communicates with the chamber. The handle includes a sleeve, a connecting rod and a grip rod. Both ends of the connecting rod are respectively connected to the sleeve and the grip rod, and the sleeve is pivotally sleeved on the main body, so that the handle is rotated relative to the main body, and the first or second caulking is connected to the perforation, and the detent member is arranged in the chamber. The first steel ball is pivotally embedded in the perforation, so that the detent member drives the first steel ball to be embedded in the first or second caulking, thereby positioning the handle.

An extendable-retractable pet leash includes a housing with a spring-actuated take-up reel. A personal protection device is mounted on the housing and can comprise, for example, an extendable-retractable knife, a taser or a siren. The housing also mounts a light for illuminating a surrounding area. The leash, personal protection device and light can all be operated by actuators mounted on the housing for convenience, one-handed operation.

An adjustable multi-blade knife is disclosed that includes a handle, a plurality of blades, and a blade spacing adjustment mechanism. The blades are oriented in parallel with each other and supported by the handle. The blade spacing adjustment mechanism is operable to cause movement of the second blade relative to the first blade while retaining a substantially parallel orientation with the first blade.

An adjustable multi-blade knife is disclosed that includes a handle, a plurality of blades, and a blade spacing adjustment mechanism. The blades are oriented in parallel with each other and supported by the handle. The blade spacing adjustment mechanism is operable to cause movement of the second blade relative to the first blade while retaining a substantially parallel orientation with the first blade.