Patent ID: 8413549
Filing Date: 2013-04-09
Classification: B25B

Abstract:
1. A revolving screwdriver with ratchet structure comprising: a handle for adapting to be gripped by a user; a pushing rod axially connected to the handle; a sliding member axially and slidably connected to the pushing rod, the sliding member having a sliding hole axially defined therein and extending therethrough for sleeving on the pushing rod, the sliding member having a receiving space axially defined in one end thereof and the sliding hole formed an opening in a bottom of the receiving space, the sliding member having a holding chamber axially defined therein and located adjacent to the receiving space, the holding chamber communicating with the sliding hole; a revolving cylinder rotatably and axially received in the holding chamber, the revolving cylinder having a center hole axially defined therein and extending therethrough for pivotally assembling within the holding chamber, the revolving cylinder having a plurality of containing holes axially defined therein and extending therethrough for adapting to receive tool bits, the containing holes radially spaced around the center hole, each containing hole selectively aligned with the sliding hole and the opening, such that the revolving cylinder is rotatable relative to the sliding member for changing to the desired tool bit; at least one ratchet wheel rotatably received in the receiving space, the at least one ratchet wheel having a through hole axially defined therein and aligned with the opening of the sliding member, the through hole having a plurality of grooves axially defined in an inner periphery thereof; two rotators pivotally received in the receiving space for selectively engaging with the at least one ratchet wheel, two springs compressibly received in the receiving space and respectively connected the two rotators, each spring having two ends respectively abutting against an inner periphery of the receiving space and the corresponding rotator; a limiting member pivotally received in the receiving space and located between the two rotators, the limiting member having a protrusion axially formed thereon; a base received in the receiving space, the at least one ratchet wheel, the limiting member, the two rotators and the two springs located between the base and a bottom of the receiving space, the base having an arc-shaped first guiding slot, a limiting hole and a pivot hole defined therein and axially extending therethrough, the limiting hole located between the first guiding slot and the pivot hole, the limiting member pivotally engaged with the limiting hole and the protrusion passing through the first guiding slot for moving along the first guiding slot; an adjuster movably received in the receiving space and located exterior of the base, the adjuster having one end pivotally engaged with the pivot hole of the base, the adjuster having a driving hole defined therein and axially extending therethrough, the protrusion of the limiting member passing through the driving hole for being driven by the adjuster; and a driving shaft sequentially passing through the base and the through hole of the at least one ratchet wheel to be rotatably connected to the sliding member, the driving shaft partially received in the receiving space and axially aligned with the opening, one end of the driving shaft having a plurality of flanges annularly formed on an outer periphery thereof for correspondingly engaging with the grooves of the at least one ratchet wheel; whereby when the sliding member axially slides relative to the pushing rod, the pushing rod relatively moves along the sliding hole and the aligned containing hole of the revolving cylinder to push the corresponding tool bit into the driving shaft; when the adjuster is pivotally moved about the driving shaft, the protrusion of the limiting member is driven by the adjuster to move along the first guiding slot of the base, one of the two rotators pressed to compress the corresponding spring by the limiting member for disengaging the at least one ratchet wheel, such that the driving shaft is able to pivotally move with the at least one ratchet wheel in the corresponding rotating direction and ratchetably drives the desired tool bit.