Abstract: A tool of the type having a drive stud for receiving and releasing a tool attachment includes an opening in the drive stud and a locking pin movably mounted in the opening. The opening defines first and second ends, and the first end of the opening is located at a portion of the drive stud constructed for insertion into the tool attachment. An actuating member is movably positioned on the drive stud, and the actuating member defines a sliding surface that engages the pin. A first spring biases the sliding surface toward the pin, and a second, weaker spring biases the pin toward the sliding surface. The first spring reacts against a ring that is disposed between the spring and a shoulder formed on the tool. The shoulder extends away from the longitudinal axis of the drive stud by a lesser distance than the spring or the ring.

Abstract: The present invention provides rotary positioning structure of the ratchet screwdriver. The rotary positioning structure includes two radial grooves, penetrating radially between the body of the ratchet screwdriver and the central axle hole. There are two -shaped snappers having a transverse rack and two vertical racks, and each is mounted separately into two radial grooves. The two vertical racks are inserted into two vertical slots. The transverse rack is placed opposite to the top flange of gear of the shaft lever. A flexible locker is used to press down the two -shaped snappers. A rotating drum is mounted and limited externally onto the body, while two troughs are arranged at intervals onto an inner wall of the retaining block opposite to the lower rivet holder, thereby forming a rotary positioning structure and offering a higher stability of positioning and ease-of-operation.

Abstract: A spanner has a handle, the handle having two opposite convex cambered surfaces between two narrow opposite surfaces; at least one convex cambered surface being formed with protruding pattern. The protruding pattern is protruding character which are used to indicate the size of the spanner or the trademark of the spanner. The protruding patterns are at two opposite convex cambered surfaces so as to have an effect of slideproof. The edges of the protruding pattern are cambered edges. Height of the protruding pattern is from 0.4 mm to 0.6 mm.

Abstract: Apparatus for engaging a mechanical component, such as a fastener. The apparatus includes a handle, and an elongated shank with opposing proximal and distal ends. The distal end supports a tool driver. The proximal end is pivotally coupled to a location offset from a midline of the handle to facilitate alignment of the shank along the handle in pivotally opposite extended and shortened positions, respectively. In the extended position, the tool driver projects a first distance beyond a first end of the handle. In the shortened position, the tool driver projects beyond an opposing second end of the handle a second distance less than the first distance.

Abstract: A screwdriver handle includes first and second handle parts each having an end face with a pivotal coupling portion. The second handle part is pivotable between two positions relative to the first handle part such that the screwdriver handle is switchable between an in-line state and an angled state. Two positioning holes are defined in one of the end faces and a receptacle is defined in the other end face and aligned with one of the positioning holes. A positioning member is mounted in the receptacle and includes an end releasably engaged with one of the positioning holes to retain the second handle part in one of the positions. A control member is mounted on one of the first and second handle parts and operable to disengage the positioning member from the positioning holes to thereby allow the second handle part to pivot relative to the first handle part.

Abstract: An improved wrench for loosening and tightening objects having flexibility in two different planes of movement. The flexible drive wrench consists of an adjustable handle capable of rotating to achieve different angles along with a flexible shaft comprising of numerous steel links. The handle rotates around the flexible links when the release is engaged and locks when the release is disengaged. In addition, the steel links allow for flexibility along another plane of movement. Numerous links are connected together to form a flexible wrench by inserting a stud with a rounded end into the slotted cavity of the next link with a mushroom head steel pin connecting them. To the last link of the flexible wrench is connected a link with an open-end wrench head, closed-end wrench head, ratcheting head, or other fastening tool head for the removal of fasteners such as bolts, nuts, and other fasteners.

Abstract: A driving tool includes a tool stem having a non-circular spatial engaging member and having one or more flat surfaces, a tool shank having a non-circular socket opening and having one or more curved surfaces for pivotally receiving the spatial engaging member of the tool stem and for allowing the tool shank to be selectively tilted relative to a longitudinal axis of the tool stem. A control ferrule is slidably engaged onto the tool shank and slidable and engageable onto the tool stem for retaining the tool shank in line with the longitudinal axis of the tool stem and for preventing the tool shank from being tilted relative to the tool stem to other angular position.

Abstract: A wrench has a body, a head and at least one pivotal device. The body has two arms separately formed on a distal end of the body and a mounting recess formed between the two arms. Each arm has a hole defined through the arm. The head is rotatably and replaceably mounted inside the mounting recess and has a driving hole defined through the head and two pivotal holes defined in the outer surface of the head and facing the holes in the body. The at least one pivotal device is movably mounted between the body and the head for holding the head. When the wrench is in use, the body may be rotated at various angles relative to the head, so that the wrench could be used in a limited space and is convenient in use. Furthermore, the head may be conveniently replaced depending on a user's needs.

Abstract: A ratcheting tool including a handle formed with an integral yoke at a first end and a tool head coupled to the yoke at a pivot. The tool head has a toothed hub facing rearwardly of the pivot and into the yoke. A locking spool is rotatably carried in the yoke adjacent the toothed hub. The locking spool has a first face, a second face, and a first tooth extending along both the first face and the second face and engaging the toothed hub. The locking spool is rotatable between a first position in which the first face is adjacent the toothed hub, thereby locking the tool head in a selected angular position with respect to the handle, and a second position in which the second face is adjacent the toothed hub such that the tool head is pivotable about the pivot.

Abstract: This invention relates to an F figure wrench that comprises a holding rod, a moving part, a turning rod and a driving part. At one end of the holding rod, a concavity is made and two lugs are implemented; the concavity is made as a guide hole to accommodate the moving part, the lug holes of the two lugs are used as pivot holes for the driving part to be pivot-connected with the holding rod. Furthermore, a penetration is made on the holding rod and the moving part concentrically, and intersects through the concavity for installation of the turning rod. A cam eccentric to the turning rod axis is implemented on the turning rod; when the turning rod is turned, the moving part is pushed by the eccentric cam and moving along the guide hole in the holding rod.

Abstract: A wrench includes a lever with teeth formed on the wall of a space defined therein. A handle includes teeth formed on the wall of a space defined therein. A toothed wheel is movable in the spaces between a first position where the teeth of the toothed wheel are engaged with the teeth of the lever and handle and a second position where the teeth of the toothed wheel are only engaged with the teeth of one of the lever and handle. A switch is operable for moving the toothed wheel between the positions. A boss is formed on the handle. A groove is defined in the switch. The arrival at the first position is signaled by the contact of the boss with an end of the groove while the arrival at the second position is signaled by the contact of the boss with another end of the groove.

Abstract: A wrench having a ratchet head able to vertically and horizontally rotate for 360° includes a tang having a longitudinal slit of predetermined length in the center and a pair of symmetrical prongs integrated with a front end thereof for rotatably engaging with a drum-shaped ratchet head which has a solid rectangular driver on underside and a hexagonal box driver on the top, a handle slidably sleeved on the tang having a small upper through hole for disposing a pressed button and a large lower through hole in an underside a bolt inserted through the lower through hole, the slit and screwed with the press button, a positioning cap fixed within the large lower through hole and biased by a spring therebetween engageable within one of the retaining grooves under the tang.

Abstract: An angle retaining assembly of a hand tool comprises a handle; a head having at least one screw hole for receiving at least one resisting element; when the resisting element screws into the screw hole; a front end of the resisting element protrudes out to be in contact with the pivotal portion of the handle to have a resisting effect so as to fix the bending angle between the head and the handle. The at least one screw hole is formed at a lateral side or a front side of the connecting portion. Or the at least one screw hole is formed at a lower side of pivotal portion of the handle.

Abstract: An insertion type hand tool comprises a tool body having a handle and a connecting portion extended from the handle; the connecting portion having a combining groove; a driving portion having an engaging end corresponding to the connecting portion; at least one side of the engaging end being formed with an inclined side for resisting against the combining groove of the connecting portion so that the orientation of the driving portion is adjustable with respect to the connecting portion; one side of the engaging end near the driving portion having a flat side; the flat side being adjacent with an inclined side; and an elastic unit is installed in the engaging end of the driving portion so as to be positioned in a positioning hole of the connecting portion.

Abstract: A bi-sectional wrench includes a lever, a handle and a toothed wheel. The lever includes a space defined therein and a plurality of teeth formed on the wall of the space. The handle includes a space defined therein and a plurality of teeth formed on the wall of the space. The toothed wheel is movable in the spaces between a first position and a second position. The teeth of the toothed wheel are engaged with the teeth of the handle and the teeth of the lever so that the handle and the lever are pivoted by a common angular speed in the first position of the toothed wheel. The teeth of the toothed wheel are only engaged with the teeth of the handle or the lever so that the handle and the lever are pivoted by different angular speed in the second position of the toothed wheel.

Abstract: A rotary wrench including a working head and a handle. The handle has two arms defining a holding space in which the working head is installed. The two arms are respectively formed with a first thread hole and a second thread hole with different spiral directions and opposite to each other. The working head has a first threaded end and a second threaded end opposite to each other respectively corresponding to the first and second thread holes of the handle. The first and second threaded ends have different spiral directions respectively corresponding to the spiral directions of the first and second thread holes of the handle. The first and second threaded ends of the working head are respectively screwed in the first and second thread holes of the handle.

Abstract: A bendable wrench includes a handle, a head and a pivot. The handle includes a first ear formed thereon, a second ear formed thereon and a plurality of teeth formed on an internal side of the second ear. The head includes an ear and a plurality of teeth formed on an internal side of the ear thereof. The pivot is movably inserted in the ears so as to pivotally connect the head to the handle. The pivot includes a plurality of teeth that can be engaged with the teeth so as to firmly retain the angle between the head and the handle and disengage from the teeth of the head so that the angle between the head and the handle can be changed.

Abstract: A tool connecting device includes a shaft having a non-circular socket opening for receiving a non-circular rotatable member of a tool member to allow the tool member to be selectively tilted relative to the shaft to different angular position. A protrusion is extended from the tool member for engaging with the shaft to anchor the rotatable member to the shaft and to prevent the tool member from being tilted relative to the shaft. A control ferrule may be slidably engaged onto the shaft to selectively retain the tool member in line with the shaft and to prevent the tool member from being tilted relative to the shaft, or to allow the tool member to be slanted and tilted relative to the shaft to different angular position.

Abstract: Gripping pliers consisting of a jointed clamp and handle. The clamp contains a longitudinal slot with longitudinal apertures defining first and second detent positions. In the first position, the joint is movable whereas in the second position, the joint is locked. The handle is rotatably mounted on a bearing ring which permits fine adjustment of the opening width of the pliers.

Abstract: An articulated wrench includes an elongate handle with a generally U-shaped depression at an end of the handle with an edge portion of the handle extending on either side of the depression, and a wrench head formed as a generally planar body with an aperture therein for engaging a fastener to be turned with the wrench, with the body of the wrench head nested into the depression in the handle with the edge portions of the handle on either side of the depression extending along a portion of the edge of the wrench head, and with the wrench head pivotally interconnected to the handle so as to allow rotation of the wrench head relative to the handle. The proportions of the wrench head are selected and the connection between wrench head and handle are selected so as to minimize the clearance required between a fastener and adjacent obstructions in a confined space for engagement of the fastener with the wrench.

Abstract: A hand tool includes a head which has an insertion and first teeth are defined in an outer periphery of the insertion. The insertion is pivotably connected to a recess between two lugs on a handle and a first biasing device is connected to an inner end of the recess. A control member is located between the insertion and the inner end of the recess, and has second teeth which are engaged with the first teeth. A cam-like protrusion projects from an underside of the control member and includes a curved outer surface which is in contact with the first biasing device. The first and second teeth are disengaged from each other when pivoting the control member so that the head can be pivoted, the first and second teeth are engaged again when the control member are pivoted back such that the head is positioned at a desired position.

Abstract: A cordless screwdriver, having a housing (12, 18) equipped with a handle (14), having an in particular permanently installed rechargeable battery (40), and having a transmission (72), is particularly compact, lightweight, and strong because the transmission (72), embodied in the form of a sun-and-planet gear, is simply inserted into a hollow, cylindrical transmission housing (18) and can be secured in position in it by an axial securing plate (62); the transmission housing (18) is also provided with an internal gearing and serves as the sun gear as well as being integrated into the reinforcing structure of the cordless screwdriver (10).

Abstract: A new mechanism of an open-end adjustable spanner which includes a right latch, a left latch, a return spring, and a control member containing hairpin springs and a serrated bit installed in an accommodation trough of a handle to create a torque transmission structure to turn a ratchet by gearing to permit easy alignment of the ratchet with the bolt or nut and avoid slipping therefrom before and after tightening or loosening the bolt or nut; and allow effort-saving and convenient torque application in clamping head of a bolt or nut by selecting a proper specification of the configuration of the open end of the ratchet.

Abstract: A palm type spanner comprises a driving head having a receiving portion for receiving a driving tool; and a handle body being an integral plate-like structure; one end of the handle body being formed with an opening portion; the driving head being pivotally installed to the handle body; thereby the driving head being rotatable along the pivotal shaft; and the handle body having a hollowed groove which has a size capable of receiving the driving head.

Abstract: A hand tool with a swinging structure, including a head section, a handle connected with the head section via at least one swinging joint and a shift button and a resilient unit disposed at the swinging joint. The swinging joint is composed of a first pivot end and a second pivot end pivotally connected with each other. The second pivot end includes a first and a second lugs and a base section connected therebetween. A stopper section is disposed on the base section. A stopper block is formed on an inner face of the shift button. The shift button is transversely and back and forth movably positioned between the two pivot ends. The resilient unit serves to resiliently push the shift button toward the first pivot end, whereby a front end of the shift button keeps engaged with the first pivot end. When the shift button is transversely shifted to a disengaged position, the stopper section will not interfere with the stopper block, permitting the swinging joint to swing.

Abstract: A wrench combination includes a handle with an ear defining an aperture and an annular groove around the aperture. A wrench includes an annular head, an ear extending from the annular head and an annular gear put in the annular head. A washer is put in the annular groove defined in the ear of the handle. A washer is put in the annular groove defined in the ear of the wrench. Each washer includes an aperture, first and second pairs of contact locations at opposite positions of the aperture on a first side. Each washer also includes a central contact location intermediate each pair of contact locations and two lateral contact locations on an opposite second side. The central contact locations are located intermediate the two lateral contact locations. A joint includes a first pair of ears for sandwiching the ear of the handle and a second pair of ears for sandwiching the ear of the wrench.

Abstract: A wrench includes a handle, a head having a pivotal portion pivotably connected to an end of the handle, and a retaining mechanism. The pivotal portion of the head includes two end portions and an intermediate portion between the end portions. The intermediate portion includes an arcuate outer surface section that has teeth to be releasably engaged with the retaining mechanism, allowing the head to be pivotally moved to a desired position relative to the handle and retaining the head in the desired position. Thus, the thickness of the respective end portion of the pivotal portion of the head is not reduced, preventing damage to the torque-bearing section in the respective end portion of the pivotal portion during operation.

Abstract: A palm type spanner comprises a driving head having a receiving portion for receiving a driving tool; and a handle body being an integral plate-like structure; one end of the handle body being formed with an opening portion; the driving head being pivotally installed to the handle body; thereby the driving head being rotatable along the pivotal shaft; and the handle body having a hollowed groove which has a size capable of receiving the driving head.

Abstract: A hand tool having an adjustable head with a joint lock mechanism. The joint lock mechanism comprises a first engaging device, a push button, a second engaging device, a first elastic device and a second elastic device. The push button is formed with a through hole and a first engaging portion. The second engaging device passes through the through hole and is disposed with a second engaging portion. When the first engaging portion engages the second engaging portion, the front end of the first engaging portion abuts the front end of the second engaging portion such that the second engaging device engages the first engaging device and is prevented from moving.

Abstract: The present invention relates to an indexing mechanism which provides a releasing function to permit the rotation of tool and handle members relative to each other. The indexing mechanism is positioned through two extensions positioned on either the tool or the handle and a third member positioned between the two extensions. Each of the two extensions and the central member includes a splined orifice. A splined pin is positioned in the splined orifices and is moveable to permit release or engagement of the handle and the tool so that the handle and the tool can be released for rotation relative to each other and re-engaged to form a rigid connection between the tool and the handle. The indexing mechanism of the present invention minimizes sticking of the splined pin during release and re-engagement.

Abstract: A wrench includes a handle and a set of driving members to be selected to be coupled to the handle. Each of the driving members has a connecting portion complementary to the connecting portion of the handle. A coupling device is disposed at the connecting portion of the handle to detachably coupling the connecting portion of the driving member and the connecting portion of the handle. The coupling device forms a rotation axis of the driving member, such that the driving member can rotate. As a result, the driving members can be replaced quickly to the handle to meet the specific work.

Abstract: A swing head structure of a wrench with two kinds of torque output includes a head part and a handle pivotally coupled together by a shaft, the wrench can also be used as a ratchet wrench or can rotate the handle backwards and forwards to make the head part to rotate in one direction, the rotating direction can be changed, the swinging movement of the head part does not affect the rotation and transmission of the wrench and the handle, the swinging head part includes two kinds of torque output to the wrench.

Abstract: A hand tool having an adjustable head includes a handle, a head and a head locking assembly. The handle has an elongated slot with a bottom. The head has a body that has a pivot junction pivotally mounted in the elongated slot and having an exterior toothed surface. The head locking assembly includes a sliding block, a rotatable locking assembly and a block biasing assembly. The sliding block is slidably mounted in the elongated slot between the pivot junction and the bottom of the elongated slot and includes an engaging device to engage the exterior toothed surface of the pivot junction. The rotatable locking assembly is rotatably mounted in the sliding block and includes a locking device such as an eccentric cam to abut the bottom of the elongated slot to restrict the sliding block in motion and lock the head at a given angular position.

Abstract: A bendable spanner comprises a driving head having a driving portion at a front end thereof for engaging with a screw means; a length of the driving head being L3; a pivotal unit; the driving head being pivotally installed to the pivotal unit; a length of the pivotal unit being L2; and a holding portion; one end of the holding portion being pivotally installed to the pivotal unit; a length of the holding portion being L1. The length of L1 is greater than or equal to 1.5 times of the L2, and the length of L1 is greater than or equal to 1.15 times of L3. Moreover in the present invention, another end of the holding portion is connected to a pivotal unit and then the pivotal unit is further connected to a driving head.

Abstract: A socket wrench for ratchet wheel sockets, comprises a handle having a recess at a first terminal thereof, an empty space between a pair of ear portions defining the recess, each of the ear portions being provided with an axial hole; a drive piece for retaining a ratchet wheel on which a ratchet wheel socket can be mounted, the recess of the handle being capable of receiving a pivotal portion of the drive piece; and a retaining pin for connecting the handle and the drive piece by being inserted though the axial holes of the ear portions and the pivotal portion of the drive piece. The drive piece can be folded about the retaining pin to change the angular position of the drive piece with respect to the handle.

Abstract: A detent structure of a torque wrench for adjusting operation angle thereof, including a wrench handle, two detents, a resilient member and a working head. One end of the wrench handle is formed with a pivot cavity. Via the resilient member, the detents are movably disposed in the pivot cavity of the wrench handle. One end of each detent is formed with an engaging section having a connecting channel. The other end of each detent has a pres section. Two ends of the resilient member are formed with two connecting sections inserted in the connecting channels of the detents. One end of the working head has an engaging section pivotally disposed in the pivot cavity of the wrench handle. The engaging sections of the detents are engaged with the engaging section of the working head. By means of the resilient member disposed between the detents, a user can press the press sections of the detents with little strength to disengage the engaging sections of the detents from the engaging section of the working head.

Abstract: A hand tool includes a handle having at its one end provided with a chamber containing a through hole to accommodate a locking unit and at another end disposed with pivoting sections to pivot a stem for the stem to be bent into a specific angle in relation with the handle; a holder being secured in position in the chamber of the handle; a push rod in the holder pushing against the locking unit for a locking bit to be restricted in one of internal teeth of a gear of the stem to hold the hand tool in position to facilitate its use.

Abstract: This invention provides an articulated wrench, comprising: a box end; a handle; a fastening device passing through the through holes of the box end and handle; and a flexed spring disc. The fastening device has a head and a shank, wherein the head gradually expands outwards from the shank to form a flared angle having a tapering angle less than 45°. The flexed spring disc is provided in the indent of the box end and flexed along a diameter thereof to form a curvature.

Abstract: A socket wrench includes a socket element which is provided with a socket or engagement with a bolt or nut, and a hinge to act in combination with a handle and which forms a lever arm when tightening or loosening bolts or nuts. The handle is fitted at a first end thereof with a hinge half to act in combination with a socket element having a second hinge half. The handle is fitted at a second end thereof with a hinge and a socket element or other form of nut wrench.

Abstract: A positionable screwdriver includes a first housing member, a second housing member pivotally connected with the first housing member, and a positionable mechanism arranged between the first and second housing members. The positionable mechanism has a locking button, a leaf spring, a positioning block, a retaining member, and a spring. The positioning block is formed with a plurality of radial teeth and fixed to the first and second housing members. The locking button is arranged within the second housing member and positioned over the leaf spring. A top of the locking button is provided with a raised portion extending upwardly through an opening of the second housing member. The spring has an end bearing against another end of the locking button so as to keep the locking button positioned over the leaf spring, thereby keeping engagement between the leaf button and the positioning block.

Abstract: A handle of a hand tool includes two opposite wide surfaces and two opposite narrow sides. The wide surfaces are perpendicular to the rotational direction when using the tool so that the fingers except for the thumb are in contact with the wide surfaces. Each wide surface has a reinforcement protrusion extending perpendicularly therefrom and located close to the driving end of the hand tool. Each reinforcement protrusion includes a thumb area such that the user's thumb may press on the thumb area when rotating the handle.

Abstract: A pivotal driving tool includes a socket having a non-circular cavity formed by three or more planer side walls, and having an inner retaining ring. A mandrel includes a driving shank having a non-circular cross section for engaging into the socket, to allow the socket to be rotated by the mandrel. The mandrel includes a narrowed neck portion to allow the mandrel to be pivoted relative to the socket, and one or more flat surfaces to solidly anchor the driving shank to the socket. A magnetic member may be disposed in the mandrel, to act on and to pull the driving shank into the cavity of the socket. A barrel may be slidably engaged onto the socket, to engage onto and to be disengaged from the mandrel.

Abstract: An adjustable closed-end wrench is adapted for rotating a threaded fastener. The wrench has a handle and a wheel housing located at a free end of the handle. An engagement wheel is arranged within the wheel housing, and has an inner periphery and an outer periphery. The inner periphery defines a fastener-receiving opening adapted for receiving the threaded fastener. The engagement wheel is mounted for selective one-way rotational movement relative to the wheel housing such that the fastener is rotatable in a clockwise or counterclockwise direction.

Abstract: A hand tool having an adjustable head comprises a head, a handle, a fastening device and a joint lock mechanism, characterised in that: a bottom side of a concave pivotal portion of the handle has an inclining surface inclining forwardly from a first side of the concave pivotal portion to a second side of the concave pivotal portion; the joint lock mechanism comprises: a first engaging device and a second engaging device; the second engaging device comprises a pull button and a biasing device. The pull button is moveable from an unlocked position at the first side of the concave pivotal portion to a locked position at the second side of the concave pivotal portion. The biasing device is disposed at a front end such that when the pull button is at an unlocked position, a gap is formed between a rear end of the pull button and the bottom side of the concave pivotal portion; when the pull button is at a locked position, a front end of the pull button is adapted to engage the first engaging device.

Abstract: The invention relates to a wrench for manipulating lock nuts on cable clamps and conduit for securing electrical cable or conduit to electrical boxes. The wrench is useful for accessing difficult positions in a box such as securing a cable to a corner opening or in a back row of a box having multiple rows of cables. The wrench comprises a central handle shaft, two transition sections, one extending on either side of the handle shaft, and two arc shaped heads, one arc shaped head extending from each transition section, such that each arc shaped head is displaced at an angle to the handle shaft and at a distance normal to the handle shaft. Each head comprises at least two tabs for engaging a lock nut.

Abstract: A valve wrench comprising a telescoping shaft assembly further comprising an inner shaft and an outer shaft, a handle pivotally attached to a first end of the shaft assembly, and a work coupling element fixed or mounted on a second end. The inner shaft may include a spring loaded button that engages the outer shaft to hold the inner and outer shaft in an operation position or alternatively in a storage position. The handle pivots to form a compact linear assembly in a storage configuration and is shaped conformal to the telescoping shaft to minimize occupied space in the storage configuration. The inner and outer shafts may be constructed from a number of complementary cross section shapes including rectangular, hexagonal, and spline to assist in the transfer of torque from the handle to the valve. A number of alternative valve coupling elements are provided for different valves.

Abstract: A wrench includes a tool head having a number of teeth formed in a chamber, and a handle having a shaft rotatably engaged into the chamber of the tool head and having a channel laterally formed in the shaft, a stem is engaged into the channel of the shaft, and includes one or more actuators. A follower is slidably received in the channel of the shaft, and includes one or more teeth for engaging with the teeth of the tool head, and for selectively locking the handle to the tool head at selected angular position. The follower includes a space formed by an inner peripheral surface, for engaging with the actuators. One of the actuators may force the teeth of the follower to solidly engage with the teeth of the tool head.

Abstract: A fastener-driving tool assembly includes a fastener-driving member and a coupling device. The fastener-driving member includes a first end and a second end for driving a fastener. The first end of the fastener-driving member includes a polygonal opening. The coupling device includes a first member and a second member. The second member has a polygonal end securely engaged with the polygonal opening of the fastener-driving member. The first member includes an end for engaging with the other end of the second member. The other end of the first member includes a polygonal engaging hole for engaging with one of an extension rod, a handle, and a polygonal first end of a second member of a similarly constructed coupling device.

Abstract: A wrench includes a handle, a head having a pivotal portion pivotably connected to an end of the handle, and a retaining mechanism for allowing the head to be pivotally moved to a desired position relative to the handle and retaining the head in the desired position. The pivotal portion of the head includes a fore part and a rear part with reference to a ratcheting direction of the handle. The fore part includes an arcuate outer surface section. The rear part includes a toothed section having a plurality of teeth. The toothed section has a dedendum circle located inside an area delimited by the arcuate outer surface section. Thus, the thickness of the fore part is not reduced, preventing damage to the torque-bearing section in the fore part during operation.

Abstract: A hand tool includes a driving member, and a wrench body mounted on the driving member. The wrench body includes a handle, a driving head mounted on an end of the handle, and a locking portion rotatably mounted on the driving head and inserted into the mounting hole of the driving member. Thus, the wrench body can drive the driving member to rotate through 360 degrees reciprocally so as to rotate and unscrew the nut successively, so that the driving member can be used to unscrew the workpiece easily and rapidly.