An external tooth type ratchet screwdriver includes a handle and a ratchet head, the handle is provided with a ratchet seat, a first pawl and a second pawl; the ratchet head is of a round-bar shape and passes through the center of the ratchet seat; the middle part of the outer surface of the ratchet head is provided with teeth; one end of the inner circle of the first pawl is provided with a ratchet teeth structure; the second pawl has the same structure with the first pawl; the end surface of the ratchet seat is eccentrically provided with a circle of annular groove, and one end of the annular groove is cut off, and arc-shaped barrier strips are oppositely arranged on a cutoff; installation seats are formed between the wall of the ratchet seat and the arc-shaped barrier strips; a reversing cover is clamped outside the ratchet seat.

A ratchet tool provided, including: a driver body, including a handle and a working rod connected with the handle, at least one of the handle and the working rod being integrally formed with a first blocking structure; at least one sleeve member, being disposed around and unidirectionally rotatable about the driver body, integrally formed with a second blocking structure, at least one of the first and second blocking structures being configured as a ratcheting structure, the second blocking structure being releasably stuck with the first blocking structure in a rotation direction; wherein when there is a relative torque greater than a predetermined torque between the at least one sleeve member and the driver body, at least one of the first blocking structure and second the blocking structures deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction.

A ratchet tool provided, including: a driver body, including a handle and a working rod connected with the handle, at least one of the handle and the working rod being integrally formed with a first blocking structure; at least one sleeve member, being disposed around and unidirectionally rotatable about the driver body, integrally formed with a second blocking structure, at least one of the first and second blocking structures being configured as a ratcheting structure, the second blocking structure being releasably stuck with the first blocking structure in a rotation direction; wherein when there is a relative torque greater than a predetermined torque between the at least one sleeve member and the driver body, at least one of the first blocking structure and second the blocking structures deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction.

A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a housing engaged with the body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit. The housing for the electronics unit can be formed to be a single use component of the tool or can be designed for multiple uses with a configuration that can be engaged with cradles forming the body of the wrench having various different configurations.

A torque wrench for use in driving fasteners is provided. The wrench includes an electronics unit disposed within a housing engaged with the body of the wrench that is capable of sensing and measuring the torque applied to a fastener by the wrench and providing an output of the level of torque to the user. The data sensed by the electronics unit can be utilized to provide feedback to the user regarding the operation of the wrench, and to monitor the overall operation of the wrench for calibration purposes, among other functions. During use, the wrench can provide the user with visual, audible and tactile feedback regarding the operation of the device relative to stored maximum torque values stored in the electronics unit. The housing for the electronics unit can be formed to be a single use component of the tool or can be designed for multiple uses with a configuration that can be engaged with cradles forming the body of the wrench having various different configurations.

A ratchet mechanism includes: a first member having an annular surface provided with a plurality of teeth arranged parallel to its axial direction; a second member configured to be rotatable relative to a circumferential direction of the annular surface; at least two first drive transmission members arranged on the second member, each including at least one ratchet tooth, the first drive transmission members being configured to be engaged with the teeth to transmit motion between the first member and the second member, where the ratchet tooth of each of the first drive transmission members is in different engaged states with the teeth.

A ratchet mechanism includes: a first member having an annular surface provided with a plurality of teeth arranged parallel to its axial direction; a second member configured to be rotatable relative to a circumferential direction of the annular surface; at least two first drive transmission members arranged on the second member, each including at least one ratchet tooth, the first drive transmission members being configured to be engaged with the teeth to transmit motion between the first member and the second member, where the ratchet tooth of each of the first drive transmission members is in different engaged states with the teeth.

A ratchet screwdriver includes a direction-switching apparatus. The direction-switching apparatus includes a cylinder, a toothed wheel, two pawls, two springs and a connector. The cylinder includes a wheel-containing chamber in communication with two pawl-containing chambers. The toothed wheel is inserted in the wheel-containing chamber. The pawls are respectively inserted in the pawl-containing chambers. Each of the springs is connected to one of the pawls in one of the pawl-containing chambers. The connector interconnects the springs so that at least one of the springs keeps at least one of the pawls engaged with the toothed wheel to allow the cylinder to rotate the toothed wheel in at least one of two directions.

A ratchet screwdriver includes a direction-switching apparatus. The direction-switching apparatus includes a cylinder, a toothed wheel, two pawls, two springs and a connector. The cylinder includes a wheel-containing chamber in communication with two pawl-containing chambers. The toothed wheel is inserted in the wheel-containing chamber. The pawls are respectively inserted in the pawl-containing chambers. Each of the springs is connected to one of the pawls in one of the pawl-containing chambers. The connector interconnects the springs so that at least one of the springs keeps at least one of the pawls engaged with the toothed wheel to allow the cylinder to rotate the toothed wheel in at least one of two directions.

A ratcheting screwdriver assembly includes a handle and a lever that is pivotally disposed on the handle. The lever is urgeable into an engaged position and the lever is biased into a disengaged movement. A shaft is rotatably disposed in the handle. A plurality of bits is provided and a respective one of the bits is insertable into the shaft to engage a respective type of fastener. A direction selector is movably integrated into the lever and the direction selector is in mechanical communication when the shaft. The direction selector is positionable in a tightening condition to tighten the fastener when the lever is urged into the engaged position. The direction selector is positionable in a loosening condition to loosen the fastener when the lever is urged into the engaged position.