High leverage locking-type pliers incorporating a four bar linkage system adapted to amplify force applied by the user to an object gripped between jaws of the pliers. The pliers include first and second handles, first and second jaws, and a center link rotatably or pivotally coupled to the first and second handles. A first link pivot where the center link rotatably or pivotally couples to the second handle may be a first distance L1 away from a second jaw pivot where the second jaw rotatably or pivotally couples the second handle. A first jaw pivot where the second jaw rotatably or pivotally couples the first handle is a second distance L2 away from the second jaw pivot. In an embodiment, the first distance L1 is about 34% to about 70% of the second distance L2.

A clamping device includes a fixing clamp and a positioning clamp for clamping two plate pieces. The positioning clamp includes a main body having a first abutment surface and a second abutment surface separated by an abutment angle and suitable for respectively abutting against first plate surfaces of the plate pieces. A reversing mechanism includes a reversing member rotatably disposed in the main body and having a limiting portion. The reversing member is rotatable relative to the main body between a first side and a second side, in which the limiting portion is aligned with the first abutment surface and the second abutment surface, respectively, and is suitable for abutting against the end surfaces of the plate pieces.

Disclosed is a release mechanism for locking pliers. The mechanism includes a center link and release link that work together to form an over-center lock with a release lever that acts sequentially on the center link and release link. The release lever can first contact the center link at a protrusion, and then contact a release link connected to the center link to release the over-center lock. User experience is therefore improved by a sequential unlocking operation that reduces the amount of leverage required to unlock the pliers.

Locking pliers according to an embodiment of the present disclosure can be easily unlocked by pressing a pressing unit of an opening lever with a thumb while gripping the levers with one hand, and the locking pliers can give tension to an object by pulling the object through the principle of leverage.

Pliers are provided. Pliers include an upper handle, a lower handle, an upper jaw coupled to the upper handle, and a lower jaw coupled to the lower handle. In general, the upper jaw includes workpiece engagement surface, such a first set of teeth configured to engage a workpiece, and the lower jaw includes a workpiece engagement surface, such as a second set of teeth and a third set of teeth. The lower jaw opposes the upper jaw such that the first set of teeth faces the second set of teeth and the third set of teeth. At least a section of the workpiece engagement surface of the lower jaw is movably coupled to the lower jaw such that it moves relative to the lower as torque is applied to a workpiece, thereby increasing torque applied to the workpiece.

Adjustable locking pliers includes a lock assembly, a jaw pressure adjustment wheel for adjusting the clamping pressure and a cam plate.

A locking pliers includes a pliers-body, a rotating shaft and an operating and pivoting unit. The pliers-body includes a fixed jaw, a movable jaw and a jaw end member disposed on the movable jaw. The rotating shaft is rotatably connected with the fixed jaw about a pivot axis and is movable along the pivot axis, and has clamp and insert ends. A clamp member is disposed on the clamp end. A pivot member extends through the fixed jaw and connected with the rotating shaft and is operable to move the rotating shaft close to or away from the fixed jaw. A retaining member extends through the fixed jaw and the rotating shaft to retain the rotating shaft to a first or second position. With the rotating shaft rotated between first and second positions, the locking pliers can be shifted to two types of use.

An improved parallel-jaws locking wrench/plier with toggle action includes a body element, a fixed jaw, and a moving jaw capable of moving rectilinearly by means of an action cam, which is pivotally connected to a locking lever coupling respectively to the upper ends of a fulcrum bar and a releasing lever thereof. A handle secured to the body element has an axially adjustable element to regulate the opening of the jaws. Close to the pivot of the releasing lever are two outstanding members disposed respectively opposite sides thereof. Gripping the locking lever towards the handle till being stopped by the two outstanding members hitting said handle will toggle continuous gripping/clamping action on a workpiece. Gripping the releasing lever towards the handle will render the two outstanding members to serve as fulcrums, providing the former with leverage to force the toggle linkage back to its relaxing condition to release the workpiece. The releasing action requires only one hand.

A hand tool includes a first jaw, a first handle fixed to the first jaw, a second jaw, and a second handle pivotally coupled to the second jaw, a link member, and an adjustment member. The adjustment member is operable to axially move a first end of the link member to vary a distance between the first and second jaws. The adjustment member includes an engagement surface engageable with the first end of the link member, a shank in threaded engagement with a bore in the first handle, and a flange extending from the shank opposite the engagement portion. The flange includes a first side, a second side opposite the first side, and an elongate opening extending through the first and second sides.

A removal tool is provided. The removal tool includes a wrench apparatus having a body having a handle, wherein a portion of the body is structured to engage a securing member. The removal tool also includes a locking tool assembly and a transfer assembly. The locking tool assembly has a first jaw, a second jaw coupled to the first jaw, and a handle extending from the first jaw, the first and second jaws being structured to engage a conduit. The conduit is coupled to the securing member. The transfer assembly is coupled to the handles of the wrench apparatus and the locking tool assembly in order to transfer a force therebetween, thereby allowing the securing member to be removed from the conduit.