Abstract: A ratchet transmission control mechanism includes a main body, a spindle rotatably mounted in a longitudinal hole in the main body, two pawls slidably mounted in two transverse holes in the main body, respectively, two elastic members respectively mounted in two arcuate channel devices defined in an outer periphery of the main body, and a switch cap mounted around the main body. The switch cap is movable between three positions, wherein when the switch cap is in a central position, the two pawls are respectively biased by the elastic members to engage with a toothed portion of the spindle, thereby allowing the spindle to drive a fastener in either direction.

Abstract: A ratchet wrench includes a ring-shaped head having a threaded inner periphery and an operation member is rotatably retained in the head. The operation member has a ridge member extending from one end thereof and two pawl members are respectively retained on two sides of the ridge member. Each pawl member has a first side with teeth defined therein and a second side of each pawl member includes two inclined surfaces on two end of the second side and a straight surface is connected between the two inclined surfaces. The teeth of each pawl member are engageable with the threaded inner periphery of the head. One of the two inclined surfaces and the straight surface of each pawl member is engaged with respective one of the two parallel surfaces of the ridge member. An operation disk is mounted to the head and two torsion springs are respectively connected between the two pawl members and the operation disk.

Abstract: A ratchet assembly includes a housing having an actuator confining portion which extends axially and projects radially, which confines an actuator receiving space for receiving an actuator, and which is formed with an axially extending slot. A ratchet body is disposed rotatably in the housing, and has an outer surface provided with first and second ratchet wheels which are axially displaced from each other so as to define a slide portion therebetween. The actuator includes a curved plate, and first and second pawl members which project radially from the curved plate toward the ratchet body and which are disposed on opposite sides of a central line that extends through a central point of an arc length of the curved plate.