A torque structure includes a first body provided with a receiving recess, a second body pivotally connected with the first body, a first elastic member received in the second body, a retaining unit including a mounting seat provided with a first threaded portion and a plurality of first through holes, a first adjusting member provided with a head, a positioning seat provided with a plurality of second through holes, and a locking unit including a plurality of first locking members, a second locking member, a plurality of third locking members, a fourth locking member, a fastening member, and a second adjusting member. The fastening member is provided with a fitting portion connected with the first body. The fastening member is provided with a third threaded portion. The second adjusting member is provided with a fourth threaded portion screwed into the third threaded portion.

A socket wrench for turning sockets has a handle joined to a head having an inside wall accommodating a body including a socket holder. A permanent magnet attached to the socket holder holds a socket on the socket holder. The body has a plurality of ramps facing the inside wall of the head. Rollers engage the ramps and inside wall. A member mounted on the body engages the rollers to selectively shift the rollers relative to opposite end sections of the ramps. First and second permanent magnets on the body and member maintain the member in selected shifted positions to retain the rollers adjacent the end sections of the ramps.

A ratchet wrench (1) has a flexible clutch ring (500) that forms the mid part of a laminate-like structure comprising a wrench head (200), the clutch ring (500) and a drive element (40). When under load, the compression forces applied to the clutch ring (500) are substantially dissipated around its circumference (508) and inner surface (509), this inward force clamping upon the inherently strong drive outer surface (45). The laminate-like construction enables a reduction in the width or depth of the wrench head without a loss in strength.

A multi-functional wrench having an adjustable construction and including i) a ratchet mechanism that can be disposed at a plurality of different angular positions with respect to a body of the wrench and ii) a plurality of sockets which are useful for many applications and can accept various bits or tools engageable within the socket. The multi-functional wrench has a body that is archial or curved in shape which is a particular benefit when the wrench is used in difficult to reach areas.

An instrument for torque controlled tightening of a threaded device, including a handle, an articulable head that is articulably connected to the handle, the articulable head including a drive ratchet configured to rotate relative to the articulable head and to engage with the threaded device or a tool for engaging with the threaded device, an elastic device arranged at the handle, and a pulling mechanism operatively connecting the articulable head with the handle, the pulling mechanism having a ratchet head mechanism to engage with the drive ratchet of the articulable head, and configured to engage with the elastic device at the handle such that the elastic device is compressed or expanded upon an application of a torque to the drive ratchet and simultaneously the ratchet head mechanism blocks the rotation of the drive ratchet.

Disclosed is a combination screw and rivet fastener that couples a cover plate to a ratchet head. The fastener is inserted into the ratchet head and then screwed into a hole of the cover plate. Thereafter, the tip of the fastener opposite the fastener head is deformed in a rivet operation.

A socket wrench for turning sockets has a handle joined to a head having an inside wall accommodating a body including a socket holder. A permanent magnet attached to the socket holder holds a socket on the socket holder. The body has a plurality of ramps facing the inside wall of the head. Rollers engage the ramps and inside wall. A member mounted on the body engages the rollers to selectively shift the rollers relative to opposite end sections of the ramps. First and second permanent magnets on the body and member maintain the member in selected shifted positions to retain the rollers adjacent the end sections of the ramps.

The present invention provides an extendable wrench comprising: a wrench having a head portion and a shaft connected to a rear end of the head portion; an insertion hole recessed at a rear end of the shaft; a cover to dismountably close the insertion hole; an extension rod with a front end formed with a plug to be plug-connected with or separated from the insertion hole of the wrench; and an elastic positioning member provided between the plug of the extension rod and the insertion hole of the wrench, when the plug of the extension rod is plug-connected with the insertion hole, the elastic positioning member keeps the plug in position. Thereby, the wrench can be operated independently; when application of larger operating torque is required, the extension rod can be combined with a rear end of the wrench to form a longer operating arm of force to meet the requirements of large torque.

A method for operating a ratchet wrench having a tangential belt drive mechanism and a ratchet gear therein, including the steps of momentary pulling on the driven end of the belt for rotating the ratchet gear during a forward cycle; continually applying a first resilient tension force on the return end of the belt; continually applying a resilient compression force on the driven end of the belt of a same magnitude as the first resilient tension force toward the return end of the belt, and relaxing the step of pulling and allowing the belt to return to an initial position of the belt before the step of pulling. In another aspect of the present invention, there is provided a tangential drive mechanism comprising a first and second springs, one on each side of the ratchet gear and each acting on the belt toward a return end of the belt.

A high strength wrench includes a head portion, a shaft and a handle. A length of the shaft is multiple times of a length of the handle. At least one slot extends along a longitudinal direction of the shaft and is formed at a circumferential surface of the shaft. A cross section shape of the shaft has a structural profile of an outer side with a relatively greater thickness and an inner portion of a relatively smaller thickness. Accordingly, the shaft has a greater structural strength to allow the wrench to bear operations of high torque.