A rotational adjustment device comprising: a handle; a gripping apparatus connected to and extending from the handle; a rachet assembly located within the gripping apparatus and configured to rotate a portion of the gripping apparatus; a pivot apparatus configured to allow movement of the gripping apparatus between an open position and a closed position so that when in the open position, the gripping apparatus is extendable around a feature of interest; and a locking apparatus that releasably locks the gripping apparatus in the closed position.

A driving head structure of a socket wrench includes an assembling base and a joint portion. The assembling base includes a plurality of convex curved surfaces. The joint portion is disposed on the assembling base. The assembling base is cylinder-shaped, and the joint portion is cuboid-shaped. Each of the convex curved surfaces is contacted with each side of the joint portion.

A wrench includes a body and a ratchet ring pivotally mounted on the body. The ratchet ring has a through hole and a side hole. The side hole includes a restrainer disposed therein. Further, a drive rod with drive heads is disposed in the through hole and movable between a first position and a second position. The drive rod has an outer periphery which has a long slot. The restrainer includes an end protruding in the long slot. The long slot extends from a first end to a second end. The drive rod is selectively disposed in the first position in which the restrainer is held by the first end of the long slot. The drive rod is selectively disposed in the second position in which the restrainer is held by the second end of the long slot.

A torque wrench includes a body and a measuring device. The body includes a head portion and a rod portion. An end of the rod portion is connected with the head portion. The measuring device includes a strain gauge seat and a strain gauge. The strain gauge seat is arranged in the rod portion and is provided with a first recess and a deformation portion adjacent to the first recess. The strain gauge is connected to the deformation portion, thereby obtaining a precise torque value.

A roller wrench having a body with a circular chamber; a driving member being a regular polygonal component capable of rotating in the chamber; a plurality of rollers installed in the chamber, each of the rollers is located between a side of the driving member and a peripheral wall of the chamber; a reversing knob capable of driving the rollers to move in the chamber so that each of the rollers moves between two edges of each of sides of the driving member; and at least one elastic positioning component installed on one of the sides of the driving member, and capable of elastically moving into the driving member or protruding from a peripheral surface of the driving member. The elastic positioning component is moved into the driving member when being compressed; and is protruded from the driving member when not being acted on by an external force.

A torque wrench is provided, including a main body, a driving portion, a positioning member, a torque adjusting assembly and a tripping assembly. The main body defines an axial direction. The driving portion is disposed on an end of the main body. The positioning member is fixedly disposed in the main body. The torque adjusting assembly includes an abutting member and a mandrel, and the mandrel is disposed in the main body, rotatable about the axial direction and screwed to the abutting member. The tripping assembly includes an elastic abutting member and a plurality of notches arranged circumferentially one of the elastic abutting member and the plurality of notches is disposed on the mandrel, and the other of the elastic abutting member and the plurality of notches is disposed on the positioning member.

A hand tool includes a head and a handle. The head is pivotally mounted to the handle, permitting the position of the head to be changed relative to the handle. In addition, the tool includes a primary locking mechanism and a secondary locking mechanism. The primarily locking mechanism primarily fixes the head relative to the handle in a particular position. The secondary locking mechanism can be used to further lock the head and handle. The locking mechanisms are actuated by movement of a sleeve which is located on the handle.

A ratchet wrench comprising a housing, at least one gear supported within the housing, one of the at least one gear comprising a drive hole, a stationary handle extending from the housing, a dynamic handle hingedly extending from the housing such that, the dynamic handle is rotatable between at least one handle open position and a handle closed position, and at least one pawl, each of the at least one pawl adapted to slide between a pawl open position and a pawl closed position, one of the at least one pawl adapted to be in engagement with one of the at least one gear at a time. The dynamic handle disposed in operative communication with the at least one pawl such that, rotating the dynamic handle towards the handle closed position causes the at least one gear rotate in one direction and releasing the dynamic handle causes pawl to return to the pawl open position without causing the at least one gear to rotate in the opposite direction.

A pushing lever structure of a ratchet wrench is provided. The ratchet wrench has a head portion. A ratchet gear, a toothed element, and a pushing lever are mounted in a receiving space of the head portion. A rear peripheral surface portion of the toothed element is provided with a recess. A pushing block extending forward from the pushing lever extends into the recess of the toothed element. When rotated, the pushing lever can move the toothed element effectively because it is the pushing block of the pushing lever that drives the toothed element into displacement. The bottom side of the head portion is mounted with a cover plate, and the bottom end of the pushing lever is pivotally provided on the cover plate to enhance the rotation stability of the pushing lever.

A socket includes two opposite ends and an axis extending between the ends. The socket further includes a small-diameter section in the vicinity of the first end, a large-diameter section in the vicinity of the second end, and a polygonal section between the small-diameter section and the large-diameter section. A circular bore extends in the small-diameter section along the axis. A non-circular bore extends in the polygonal section and the large-diameter section along the axis. Thus, an entire length of the socket and a length of the large-diameter section measured along the axis are rendered relatively small without reducing a depth of the non-circular bore.