A ratchet screw driver includes a holder, a toothed wheel, two pawls, a direction switch and a ring. The toothed wheel, the pawls and the ring are inserted in the holder. The pawls are biased from each other. Each of the pawls includes a boss and a toothed face. The direction switch is connected to the holder, movable between two positions relative to the holder, and formed with two bosses. The ring includes two cutouts and two hooks. The cutouts receive the bosses so that the ring is rotatable with the direction switch. One of the hooks is engaged with the boss of one of the pawls to firmly engage the toothed face of the remaining one of the pawls with the toothed wheel when the ring is moved to one of the positions by the direction switch.

A driving tool is provided, including: a rod member, including a first end and a second end which includes two separate connection sections; a swingable assembly, including a swingable member having a third end and a fourth end, a shaft and a ring retainer, the third end extending to between the two connection sections, the fourth end including an assembling portion, the shaft being disposed through the two connection sections and the third end, a first end of the shaft being protrusive out from a first one of the two connection sections, the ring retainer being detachably mounted on the first end of the shaft and blocked by the first one of the two connection sections in an axial direction of the shaft; and at least one driving member, detachably assembled with the assembling portion.

An impact bit holder may include a drive body having a drive end configured to interface with a powered driver, a driven body having a driven end configured to interface with a bit, and an elastic torque transfer assembly configured to operably couple the drive body to the driven body. The drive body and the driven body share a common axis under a no load condition. The elastic torque transfer assembly may include a coupling protrusion and a coupling channel disposed at a coupling axis offset from the common axis such that the coupling protrusion extends into the coupling channel to operably couple the drive body to the driven body.

A tool adapter includes a body, which is elongated along a first axis. The body includes at least a first side surface that is opposite to the second side surface, as well as a first end surface that is opposite to the second end surface. The body includes a first input drive connector, which is located at a middle section of the body and which is accessible from the first side surface. The first input drive connector is structured to mate with a first drive part of a torque wrench such that a longitudinal axis of the torque wrench is parallel to the first axis when the torque wrench is connected to the adapter. The body includes a first output drive connector that is located at a middle region of the first end surface. The first output drive connector is structured to mate with a first connector part of a tool head such that a longitudinal axis of the tool head is parallel to the first axis when the tool head is connected to the adapter. The first input drive connector is defined to be a first size. The first output drive connector is defined to be a second size, which is different from the second size.

A tool extension adapted to couple to a drive lug of a driver and a tool that allows the tool to reach hard to reach places without room for a coupling. The tool extension voids the need for a larger diameter coupling by including a female recess in an end of the tool extension that receives the bit into the shaft itself.

A wrench head comprises a working axis, a first jaw, a second jaw, and a third jaw. The first jaw comprises first-jaw arcuate convex contact surfaces. The second jaw, is coupled with and pivotable relative to the first jaw, and comprises second-jaw arcuate convex contact surfaces. The third jaw, is coupled with and pivotable relative to the second jaw, and comprises a third-jaw arcuate convex contact surface and a third-jaw planar contact surface.

A torque connector includes a first body provided with a pivot seat, at least one first receiving recess, and at least one second receiving recess, a second body provided with a pivot slot, a plurality of locking portions, and a plurality of projections, at least one drive member received in the at least one first receiving recess, and at least one elastic member received in the at least one second receiving recess and resting on the at least one drive member. When one of the locking portions aligns with the at least one first receiving recess, the at least one drive member is pushed by the at least one elastic member and locked in one of the locking portions, such that the second body drives and rotates the at least one drive member and the first body.

An inertial rotation device includes: a central member with an axial direction, a first engaging portion on the peripheral surface of the central member, an inertia member with a mounting hole, and a second engaging portion on the wall of the mounting hole. The inertia member is mounted around the central member and can be displaced between an engaging position and a released position along the axial direction of the central member. The inertia member can rotate together with the central member when at the engaging position, where the two engaging portions are engaged with each other, and cannot rotate together with the central member when at the released position, where the two engaging portions are disengaged from each other. The magnitude of the torque of the inertial rotation device can be changed by switching the inertia member to the engaging position or the released position.

A shifting device includes a sleeve module and a shifting member movably disposed in the sleeve module. The sleeve module has a through hole. The through hole is divided into a first hole region, a buffering region, and a second hole region. The shifting member includes a third operating section and a fourth operating section. The shifting member is movable between a first position and a second position. The fourth operating section of the shifting member is situated in the buffering region when the shifting member assumes the first position, and the second hole region and the third working hole are adapted to turn a fastening member. The third operating section of the shifting member is situated in the buffering region when the shifting member assumes the second position, and the first hole region and the fourth working hole are adapted to turn the fastening member.

A ratchet wrench includes a box, a button, a switch and an engagement element. The box includes an upper opening, a channel, a switch chamber in communication with the upper opening via the channel, and a button aperture in communication with the switch chamber. The button is inserted in the switch chamber via the button aperture. The button includes an abutment portion to keep the button in the box. The switch includes an arched portion extending in the switch chamber around the button. The switch is operable to rotate the button by the abutment portion without hindering movement of the button into and from the button aperture of the box. The engagement element is inserted in the channel of the box. The abutment portion is operable to move the engagement element in the channel to extend a front edge from the upper opening of the box.