A wrench includes a main body, a mounting member, a push rod, two push blocks, a first elastic member, a handle, and a drive mechanism. The main body has a support arm, two pivoting portions, a rotation passage, a first receiving hole, a first receiving slot, two second receiving slots, a second receiving hole, and a shank. The push rod has a positioning element. Each of the push blocks has a first received portion, a second received portion, a third mounting portion, a first locking section, a second locking section, a first locking groove, and a second locking groove. The drive mechanism has a driving head, a control rod, and a second elastic member. The driving head has two fitting portions, a third receiving hole, multiple first positioning portions, and an operation end. The control rod has a second positioning portion and a stepped portion.

Embodiments of the current invention relate to a pliers wrench. Optionally, the jaws of the pair of pliers lock to an adjustable gap size and/or the gap between the jaws is aligned with a rotational axis of the pair of pliers. For example, there may be two jaws that adjust symmetrically around the rotational axis. In some embodiments, each jaw is closed toward an opposing jaw by a lever. Optionally, a locking mechanism locks the jaw when it reaches half the gap width from the rotational axis. Optionally, each jaw is closable independently of the other jaw. Optionally, a notch in the jaws forms an angle for clasping a bolt perpendicular to an axis of the device. For example, the notch may have a 120 angle.

The invention relates to a roller wrench comprising: a body with a circular chamber; a driving member being a regular polygonal component capable of rotating in the chamber; and 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; one end of each of the rollers is pivotally connected to an end surface of a reversing knob, so that the reversing knob drives the rollers to displace simultaneously. Thereby, the components of the roller wrench can be effectively latched with one another, and a torque value of the roller wrench will not be reduced.

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 hinge structure of a hand tool includes a first connector having a first connecting portion; a second connector having a second connecting portion; and a shaft having one end formed of a stopping portion protruded therefrom and another end having a locking slot formed thereon. The locking slot includes a locking member elastically locked thereon. The shaft penetrates through the first connecting portion and the second connecting portion. In addition, the locking member is locked inside the locking slot, such that the locking member and the stopping portion are locked at the outer side of the first connecting portion and the second connecting portion. Accordingly, the engagement area between the shaft and the first connector and the second connector is able to provide a greater strength.

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 ratchet socket may include a main body, and an outer periphery of the main body has ratchet teeth formed in an endless circular pattern to form the main body with a polygonal cross section. The main body comprises a hexagonal inner periphery to form six internal angles and six inner edges. Each of the inner edges has an engaging portion at a middle portion thereof, and each of the inner edges comprises two abutting portions at two sides of the engaging portion between the engaging portion and each of two adjacent internal angles. Each of two recess portions is formed between the engaging portion and the abutting portion to form two engaging teeth on two lateral edges of the engaging portion. Each of the internal angles is curved to form an inclined surface between the abutting portion and the adjacent internal angle.

A palm tool device includes a drive tool and a bar. The drive tool includes a drive member and a grip member connecting with and housing the drive member. The grip member is annular and surrounds the drive member. An outer periphery of the grip member forms a grip portion and a first attach portion. The bar is selectively attached to and detached from the drive tool. The bar is attachable in at least one position to the drive tool. The bar has a second attach portion and a third attach portion. The bar is attachable in a first position to the drive tool by connecting the second attach portion with the first attach portion. The bar is attachable in a second position to the drive tool by connecting the third attach portion with the engage portion.

A wrench assembly for attachment and removal of a tip to a handpiece of a surgical system includes a core and a shell including a central portion that defines a central bore. In various embodiments, the core includes an outer portion fixedly coupled to the shell and an inner portion configured for insertion into the central bore. The inner portion is removably coupled to the outer portion by a separation mechanism configured to facilitate separation of the inner portion from the outer portion at a predetermined torque.

A torque limiting ratcheting handle for a medical instrument is provided that includes a ratchet shifter, a tool connector, a torque coupler, and a rear power housing. The handle provides clockwise and counterclockwise ratcheting and limits the amount of torque in one direction while allowing for maximal torque in the opposite direction. In one aspect, the ratcheting handle may include a drive shaft removeably connected to a power tool or, alternatively, to a handle grip for manual manipulation.