A ratchet wrench for turning a fastener. The wrench comprises a handle, a left head at the left end of the handle, and a right head at the right end of the handle. The left head comprises a left socket part. The right head comprises a right socket part. The left socket part is rotatable within the left head in a first direction (e.g. clockwise or counter-clockwise), but rotationally locked in a second direction. The right socket part is rotatable within the right head in the second direction, but rotationally locked in the first direction.

A ratchet wrench includes a center gear connected to the top of the ratchet wheel and a disk is mounted to the center gear. Three planet gears is connected to the disk and engaged with the center gear. A rotary member is rotatably mounted to the disk and has inner teeth engaged with the planet gears. Two pawls are respectively engaged with the disk and the ratchet wheel. A shank extends through the rotary member, the disk, the center gear and is connected to the ratchet wheel. When rotating the rotary member, the planet gears rotate the center at high speed, and the center gear rotates the ratchet wheel to quickly rotate the object to be tightened or loosened.

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 ratchet wrench includes a first and a second drive members 21, 21 rotatably mounted in a first and a second heads 16, 16 extended from a first and a second ends of a handle 10. The first drive member 21 includes a square inner periphery 35 adapted to slidably retain a drive shaft 36 including a drive fitting 45 and a drive fitting 46, and the second drive member 21 includes a drive hexagonal bit holder 53 and drive fitting 54, for providing combined functions of ordinary ratchet wrenches for turning fasteners. A first and a second ratcheting mechanisms are mounted in the first and the second ends of the handle 10 for turning the first and the second drive members 21, 21, by the handle 10.

An adjustable gripping tool including an adjustable opening to grip and impart work or a rotational force on work pieces (e.g., nuts and bolts) of various sizes is provided. The gripping tool of the present disclosure includes a ratcheting configuration and an adjusting configuration and can change between each configuration. While in the adjusting configuration, an adjusting bolt may be rotated to cause a plurality of jaws or gripping members to converge toward each other or diverge away from each other to adjust the diameter of the opening of the gripping tool. In this way, the plurality of jaws may converge onto work pieces of various sizes to grip the work pieces securely in the opening. The gripping tool may then be changed to the ratcheting configuration. In the ratcheting configuration, a handle of the gripping tool may be gripped and rotated to impart work on the work piece.

A ratchet wrench includes a body, a driving unit, a control unit, a first rotary unit, a second rotary unit and a second connector. The body has a first recess and a restriction portion. The driving unit is connected to the working end of the body and is driven by the control unit to allow the wrench to be rotated clockwise or counter clockwise. The first rotary unit has a first rotary rod, a third toothed ring, a sleeve, a first clip, a second resilient member and a bead. The second rotary unit has a second rotary rod, two caps, a second resilient member, a third rotary rod and a handle. The second connector is located in the restriction portion. The second connector is located corresponding to the groove of the first rotary rod, so that the first rotary rod does not drop from the first recess.

A ratchet wrench includes an annular head, a driving unit, a control unit, a rotary member, a second body, a bead and an end piece. The annular head receives the driving unit therein and a shaft extends from the annular head. The driving unit has a top part and a bottom part, between which a first toothed ring, a first pawl, two second pawls, a third pawl and a second toothed ring are pivotably located. The rotary member is rotatably inserted into an axial hole of the shaft and has third teeth, a recess and an engaging groove. The third teeth are engaged with the first and second toothed rings. A bead biased by a spring located in the shaft and is engaged with the engaging groove. The recess of the rotary member is connected with the second body.

A reciprocating apparatus for high torque transfer to a fitting, including tightening or loosening, having two coaxially synchronized engageable drive members provided with a sector geared radial flange engageable with an engageable rotatable drive gear, one internally supported split ratchet gear and drive socket maintained in contact with a spring biased ratchet pawl, together simultaneously rotatable in a first driving direction and independently disengageable in a second direction for reciprocative advancement of a ratchet geared socket in driving engagement with a fitting.

The present invention provides a wrench, which comprises a working part and a handle, the working part includes a main axle perpendicular to the handle and mutually cooperated bidirectional pawl and ratchet wheel, in which the ratchet wheel is arranged so as to be caused by the handle, the bidirectional pawl is arranged to rotate the main axle and has a first pawl and a second pawl which are opposite to the clutch direction between the ratchet wheel, the working part also includes a direction switching mechanism for setting clutch direction of the bidirectional pawl and the ratchet wheel; the direction switching mechanism is arranged such that a first pawl and a second pawl are engaged with the ratchet wheel selectively, such that when handle is rotated in the direction set by the direction switching mechanism, the ratchet wheel is engaged with the bidirectional pawl, then rotates the main axle; when the handle is rotated in the direction opposite to the direction set by the direction switching mechanism, the ratchet wheel and the bidirectional pawl slide over each other, and the main axle remains stationary; the working part also includes a planetary gear speed increasing mechanism acting on the main axle, the planetary gear speed increasing mechanism includes a sun gear, a planetary gear and a ring gear, in which the sun gear is arranged to rotate the main axle together, the rotation ring is arranged so as to cause the planetary gear to rotate, the gear ring is fixedly connected with the handle, so that when the handle is gripped and the rotation ring is rotated, the planetary gear speed increasing mechanism increases the speed of the rotation inputted by the rotation ring and then outputs via the main axle.

A speed increasing bidirectional mechanical converter, including a main shaft and a speed increasing planet gear unit is disclosed. The speed increasing planet gear unit includes a first ring gear, a planet gear, a sun gear and a planet carrier, wherein the planet gear is mounted on the planet carrier. The planet gear is arranged between the first ring gear and the sun gear, and rotates in an opposite direction against the sun gear. The speed increasing bidirectional mechanical converter further includes a reversing means, via which the first ring gear and the sun gear drive the main shaft. When in use, the planet carrier is kept still, and the main shaft rotates in the preset direction. The speed increasing bidirectional mechanical converter realizes the direction reverse by using the speed increasing planet gear unit, which simplifies the structure, facilitates the manufacture and decreases the space it occupies and its weight. A screwdriver and a wrench having the speed increasing bidirectional mechanical converter are provided.