This disclosure describes systems, methods, and apparatus for a locking folding knife having a handle lock and a safety switch arranged around and rotatable around a pivot axis of the knife. In an engaged position the switch overlaps at least a portion of the handle lock and prevents it from moving into an unlocked position. A spring, such as a wire form spring, can be arranged within a pocket of the switch, and when the switch is moved between engaged and disengaged positions the spring can be compressed generating a rotational bias on the switch urging the switch toward either the engaged or disengaged position.

A power-assisted folding knife, including: a blade holder; a blade arranged in the blade holder; a handle rotatably connected to the blade holder; a locking mechanism for locking the blade holder in an unfolded position and/or a folded position; the power-assisted folding knife further includes a power-assisting mechanism connected to the blade holder and the handle, for providing assisting power when unfolding a power-assisted folding knife. The power-assisted folding knife uses an assisting mechanism for providing assisting power when unfolding a folding knife, so as to facilitate easier unfolding of the folding knife and to allow single hand operation; the blade holder can be locked in an unfolded position and/or a folded position to ensure safe use of the power-assisted folding knife.

A foldable saw is provided in which a latch mechanism for latching and securing a freely foldable saw blade body in its use position can be produced and assembled very easily with a minimum number of components on the basis of an idea different from the conventional ideas and that exerts a favorable latching effect. The foldable saw 1 includes, on a saw handle body 20, a latch body 10 made of spring wire and including a coil section 11, a stop pin section 12, a latch section 13, and an operation section 15. The saw handle body 20 includes at least a seating recess 23, a pin hole 24, and a receiving groove 22. The latch body 10 is configured, in the state of being attached to the saw handle body 20, such that the latch section 13 located in front of the coil section 11 enters into the receiving groove 22 by spring bias, and that the latch section 13 retreats against the spring bias in response to an operation of the operation section 15 located in the rear of the coil section 11.

The present invention provides a power-assisted folding knife, comprising a handle, a blade, a locking mechanism, an assisting mechanism and a second assisting mechanism. The blade is rotatably connected to the handle. The locking mechanism and the second assisting mechanism are provided inside the handle. The assisting mechanism is connected to the handle and the blade respectively. When the blade is in a folded position, the assisting mechanism and the second assisting mechanism are used for locking or unlocking the blade. When the blade is in an unfolded position, the locking mechanism is used for locking or unlocking the blade. When the power-assisted folding knife is unfolded, the assisting mechanism and the second assisting mechanism provide assisting force for the blade and/or the handle.

A power-assisted folding knife is provided, including a blade holder, a blade arranged in the blade holder, a handle rotatably connected to the blade holder, a locking mechanism for locking the blade holder in an unfolded position and/or a folded position and a power-assisting mechanism connected to the blade holder and the handle. The power-assisted folding knife uses an assisting mechanism for providing assisting power when unfolding a folding knife, so as to facilitate easier unfolding of the folding knife and to allow single hand operation. Through the locking mechanism, the blade holder can be locked in an unfolded position and/or a folded position to ensure safe use of the power-assisted folding knife.

A folding knife configured for safe and rapid disassembly and reassembly includes an upper handle portion having two engaging grooves respectively adjacent to its two ends, and a lower handle portion having an engaging and pivotally connecting shaft and an engaging and locking shaft respectively adjacent to its two ends. The two shafts are engageable in the engaging grooves respectively. A blade is mounted around the engaging and pivotally connecting shaft and rotatable into and out of a space between the handle portions. A pushable locking member is rotatably connected to the engaging and locking shaft and can be pushed to allow or prevent disengagement between the engaging and locking shaft and the corresponding engaging groove. Thus, user only has to push the pushable locking member, the upper handle portion and the blade will be in a detachable from or securely connected to the lower handle portion as a whole.

A knife structure allowing rapid and safe replacement, and secure positioning of, a blade disposed along with its handle structure; wherein the knife structure includes the blade, an engaging and pushing plate, and an engaging and positioning base; a first connecting member is fixed to the engaging and pushing plate and is movably engaged in the blade and the engaging and positioning base; an engaging block is fixed to the engaging and positioning base and is movably engaged in the blade and the engaging and pushing plate; and the first connecting member is locked to the engaging and positioning base upon assembly of the knife structure. Once unlocked via a pushing and unlocking key, the first connecting member can be used to push the engaging and pushing plate and the blade simultaneously, allowing the blade to be pushed out of engagement with the engaging block and then detached for replacement.

A securing structure of a folding knife includes a blade and a handle. The blade is pivotally connected to the handle and has a pivotal connection end provided with a first engaging groove and a second engaging groove. The handle has two opposite sides each provided with a first guide hole. A stop block is provided in the handle and has a stop surface for abutting against an abutting surface of the blade. The stop block also has an inclined guide surface. The inclined guide surface is adjacent to the first guide holes and is inclined in a direction from the upper handle edges toward the front handle ends. A pin extends through the two first guide holes and can be engaged in either one of the first and the second engaging grooves and thereby clamped between a wall portion of the engaging groove and the inclined guide surface.

A folding tool assembly rotates a folding tool that is pivotally coupled to a handle of the folding tool assembly either into the handle in a closed configuration or out of the handle in an open configuration about a pivot point. The folding tool assembly may include a spring comprising a fixed end and a free end, wherein the spring is disposed within the handle, and the fixed end of the spring is affixed to an end of the handle. The free end of the spring is configured to engage a tang of the folding tool. The initial amount of force applied to rotate the folding tool to the open configuration from the closed configuration is less than the initial amount of force applied to rotate the folding tool to the closed configuration from the open configuration.

An assisted opening knife includes a handle with a pushing key for releasing and locking a blade. The blade is pivotally connected to the handle and has near its rear end a position-limiting post extending into an arcuate position-limiting groove in, and near the front end of, the handle. The assisted opening knife is characterized by the handle having therein a releasing/locking slide plate whose top side is provided with the pushing key and whose front end, a releasing/locking arm movable to a position near one end of the arcuate position-limiting groove. While the blade is stored in the handle, the position-limiting post touches the aforesaid end of the arcuate position-limiting groove and is locked by the releasing/locking arm to prevent the blade from rotation. The blade is rotatable again when the pushing key, exposed from the handle, is pushed and moves the releasing/locking arm away from the aforesaid position.