An adjustable pair of locking pliers has a fixed handle including an upper jaw, a lower jaw pivotably connected to the fixed handle, a movable handle pivotably connected to the lower jaw, and an adjustment assembly. The adjustment assembly permits adjustment of the gripping space between the upper and lower jaws when in a clamping position. The adjustment assembly includes an adjustment screw positioned in an end portion of the fixed handle and a locking piece operatively connecting the movable handle to the adjustment screw and designed to releasably lock the upper and lower jaws under tension in the clamping position. The adjustment screw includes a threaded body and a handle positioned transverse to the threaded body and designed to be manually grasped and twisted by a user to advance and retract the threaded body to release the upper and lower jaws from a locked state.

An adjustable pair of locking pliers has a fixed handle including an upper jaw, a lower jaw pivotably connected to the fixed handle, a movable handle pivotably connected to the lower jaw, and an adjustment assembly. The adjustment assembly permits adjustment of the gripping space between the upper and lower jaws when in a clamping position. The adjustment assembly includes an adjustment screw positioned in an end portion of the fixed handle and a locking piece operatively connecting the movable handle to the adjustment screw and designed to releasably lock the upper and lower jaws under tension in the clamping position. The adjustment screw includes a threaded body and a handle positioned transverse to the threaded body and designed to be manually grasped and twisted by a user to advance and retract the threaded body to release the upper and lower jaws from a locked state.

The self-adaptive self-locking clamping apparatus comprises a pair of arms pivotally interconnected to each other via a fulcrum either in the middle or on one end of the pair of arms, forming a pair of jaws with at least a variable gap for load, a fulcrum and a pair of handles for effort. The pair of handles engage with each other via a pawl and ratchet mechanism to achieve directional self-locking function, so that the clamping force applied to the pair of handles are maintained after such clamping force is removed. The self-locking pawl and ratchet engagement is self-adaptive to the geometric deformation of the pair of arms resulted from the elastic deformation caused by the clamping force, creating a firm locking grip so that a user does not have to keep maintaining the clamping force while in operation.

The self-adaptive self-locking clamping apparatus comprises a pair of arms pivotally interconnected to each other via a fulcrum either in the middle or on one end of the pair of arms, forming a pair of jaws with at least a variable gap for load, a fulcrum and a pair of handles for effort. The pair of handles engage with each other via a pawl and ratchet mechanism to achieve directional self-locking function, so that the clamping force applied to the pair of handles are maintained after such clamping force is removed. The self-locking pawl and ratchet engagement is self-adaptive to the geometric deformation of the pair of arms resulted from the elastic deformation caused by the clamping force, creating a firm locking grip so that a user does not have to keep maintaining the clamping force while in operation.