Revolving screwdriver with ratchet structure

A revolving screwdriver with ratchet structure includes a handle, a pushing rod, and a sliding member. The sliding member has a receiving space and a holding chamber defined therein. A revolving cylinder is received in the holding chamber. The receiving space receives at least one ratchet wheel, two rotators, a limiting member, a base, and an adjuster. The at least one ratchet wheel engages with a driving shaft. The rotators selectively engage with the at least one ratchet wheel. The limiting member locates between the rotators and has a protrusion formed thereon. A base has a first guiding slot defined therein. The adjuster has a driving hole defined therein. The protrusion passes through the first guiding slot and the driving hole for being driven by the adjuster and moving along the first guiding slot.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a revolving screwdriver with ratchet structure, and more particularly to a revolving screwdriver being able to control a rotating direction of a driving shaft.

2. Description of Related Art

A conventional revolving screwdriver in accordance with the prior art comprises a hollow handle and a forward device which has a hollow, cylindrical seat and a driving shaft disposed thereon. The hollow handle comprises a revolving cylinder having a plurality of axial, periphery shank cartridges for correspondingly receiving a plurality of shanks, and a push rod which is adapted to push the shank out of the corresponding cartridge into the driving shaft. The driving shaft is hollow and comprises a front end which has a section of hexagon, a rear end which has a section of circle, and a guide in the rear end thereof. The guide is aligned with a flat surface extended inwardly from the front end of the driving shaft, such that it can automatically align one shank pushed out of the revolving cylinder with the forward end of the driving shaft prior to pushing the shank out of the driving shaft for use.

However, the conventional revolving screwdriver provides for easily interchanging shanks, but it is not able to control the rotating directions of the revolving shaft as the shank is pushed to the forward end of the driving shaft. Therefore, during operating of the conventional revolving screwdriver, the user would inconveniently drive and rotate the shank of conventional revolving screwdriver.

The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional revolving screwdriver.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an improved revolving screwdriver with ratchet structure.

To achieve the objective, the revolving screwdriver with ratchet structure includes a handle for adapting to be gripped by a user, a pushing rod axially connected to the handle, and a sliding member axially and slidably connected to the pushing rod. The sliding member has a sliding hole axially defined therein and extending therethrough for sleeving on the pushing rod. The sliding member has a receiving space axially defined in one end thereof and the sliding hole is formed an opening in a bottom of the receiving space. A recess is laterally defined therein and communicates with the receiving space. The sliding member has a holding chamber axially defined therein and located adjacent to the receiving space. The holding chamber communicates with the sliding hole.

A revolving cylinder is rotatably and axially received in the holding chamber. The revolving cylinder has a center hole axially defined therein and extending therethrough for pivotally assembling within the holding chamber. The revolving cylinder has a plurality of containing holes axially defined therein and extending therethrough. Each containing hole adapts to receive a tool bit. The containing holes are radially spaced around the center hole. Each containing hole is able to selectively align with the sliding hole and the opening. The revolving cylinder is rotatable relative to the sliding member for changing to the desired tool bit.

A retainer is disposed in a bottom of the receiving space. The retainer has two bores axially and respectively defined in two sides thereof At least one ratchet wheel is rotatably received in the receiving space and located exterior of the retainer. The at least one ratchet wheel has a through hole axially defined therein and aligned with the opening of the sliding member. The through hole has a plurality of grooves axially defined in an inner periphery thereof Two rotators are pivotally received in the receiving space for selectively engaging with the at least one ratchet wheel. The two rotators respectively and pivotally engage with the two bores of the retainer. Two springs are compressibly received in the receiving space and are respectively connected to the two rotators. Each spring has two ends respectively abutting against an inner periphery of the receiving space and the corresponding rotator. A limiting member is pivotally received in the receiving space and located between the two rotators for selectively pressing one of the two rotators toward the inner periphery of the receiving space. The limiting member has a protrusion axially formed thereon.

A base is received in the receiving space. The at least one ratchet, the limiting member, the two rotators and the two springs are located between the base and the retainer. The base has an arc-shaped first guiding slot, a limiting hole, and a pivot hole defined therein and axially extending therethrough. The limiting hole is located between the first guiding slot and the pivot hole. The limiting member is pivotally engaged with the limiting hole and the protrusion passes through the first guiding slot for moving along the first guiding slot. An adjuster is movably received in the receiving space and located exterior of the base. The adjuster has a pivot end pivotally engaged with the pivot hole of the base. The adjuster has a driving hole defined therein and axially extending therethrough. The protrusion of the limiting member passes through the driving hole for being driven by the adjuster. The adjuster has an arc-shaped teeth portion laterally formed thereon and located opposite to the pivotal end. The teeth portion protrudes from the recess of the sliding member.

A cover is disposed on the sliding member for sealingly covering the receiving space. The cover has a shaft hole axially defined therein and extendingly communicating with the receiving space. The shaft hole is coaxial with the through hole of the at least one ratchet wheel and the opening of the sliding member. The cover has a pivot pin formed thereon and axially extending toward the base. The pivot pin sequentially passes through the pivotal end of the adjuster and the pivot hole of the base for connecting the cover, the adjuster and the base together. The cover has a second guiding slot defined therein and located corresponding to the first guiding slot of the base. The second guiding slot has a shape corresponding to the first guiding slot. The protrusion of the limiting member passes through the second guiding slot via the first guiding slot for moving along the second guiding slot. The cover has two directional indicators respectively disposed on two ends of the second guiding slot.

A driving shaft sequentially passes through the shaft hole of the cover, the base, the through hole of the at least one ratchet wheel to be rotatably connected to the sliding member. A rotating direction of the driving shaft is indicated by the two directional indicators. The driving shaft is partially received in the receiving space and axially aligned with the opening One end of the driving shaft has a plurality of flanges annularly formed on an outer periphery thereof and annularly located around the outer periphery thereof for correspondingly engaging with the grooves of the at least one ratchet wheel.During operation, 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 is 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.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially toFIGS. 1-3, a revolving screwdriver with ratchet structure in accordance with a preferred embodiment of the present invention comprises a handle1for adapting to be gripped by a user, a pushing rod2axially connected to the handle1, and a sliding member3axially and slidably connected to the pushing rod2. The sliding member3has a sliding hole32defined therein and axially extending therethrough for sleeving on the pushing rod2. The sliding member3has a receiving space33axially defined in one end thereof and the sliding hole32is formed an opening332in a bottom of the receiving space33. The receiving space33is located opposite to the handle1. A recess39is defined in a lateral wall of the receiving space33and communicates with the receiving space33. The sliding member3has a holding chamber31axially defined therein and located adjacent to the receiving space33. The holding chamber31communicates with the sliding hole32and the opening332.

A revolving cylinder4is rotatably and axially received in the holding chamber31. The revolving cylinder4has a center hole41defined therein and axially extending therethrough for pivotally assembling within the holding chamber31. The revolving cylinder4has a plurality of containing holes42defined therein and axially extending therethrough for adapting to receive tool bits (not numbered) of different sizes or types. Each containing hole42adapts to receive one tool bit. The containing holes42are radially spaced around the center hole41. Each containing hole42is able to selectively align with the sliding hole32and the opening332, such that the revolving cylinder4is rotatable relative to the sliding member3for changing to the desired tool bit.

A retainer38is disposed in a bottom of the receiving space33. The retainer38has two bores331axially and respectively defined in two sides thereof At least one ratchet wheel6is rotatably received in the receiving space33and located exterior of the retainer38. The at least one ratchet wheel6has a through hole61axially defined therein and aligned with the opening332of the sliding member3. The through hole61has a plurality of grooves62axially defined in an inner periphery thereof Two rotators35are pivotally received in the receiving space33for selectively engaging with the at least one ratchet wheel6. The two rotators35respectively and pivotally engage with the two bores331of the retainer38. Two springs36are compressibly received in the receiving space33and are respectively connected to the two rotators35. Each spring36has two ends respectively abutting against an inner periphery of the receiving space33and the corresponding rotator35. Each spring36provides a resilient force for pushing the corresponding rotator35toward the at least one ratchet wheel6. A limiting member34is pivotally received in the receiving space33and located between the two rotators35for selectively pressing one of the two rotators35toward the inner periphery of the receiving space33. The limiting member34has a protrusion341axially formed thereon and extending outwardly therefrom.

A base5is received in the receiving space33. The at least one ratchet6, the limiting member34, the two rotators35, and the two springs36are located between the base5and the retainer38. The base5has an arc-shaped first guiding slot53, a limiting hole52, and a pivot hole51defined therein and axially extending therethrough. The limiting hole52is located between the first guiding slot53and the pivot hole51. The limiting member34is pivotally engaged with the limiting hole52and the protrusion341passes through the first guiding slot53for moving along the first guiding slot53. An adjuster37is movably received in the receiving space33and located exterior of the base5. The adjuster37has a pivot end pivotally engaged with the pivot hole51of the base5. The adjuster37has a driving hole371defined therein and axially extending therethrough. The protrusion341of the limiting member34passes through the driving hole371for being driven by the adjuster37. The adjuster37has an arc-shaped teeth portion372laterally formed on one end thereof and located opposite to the pivotal end. The teeth portion372protrudes from the recess39of the sliding member3for being easily operated by the user.

A cover8is disposed on the sliding member3for sealingly covering the receiving space33. The cover8has a shaft hole82axially defined therein and extendingly communicating with the receiving space33. The shaft hole82is coaxial with the through hole61of the at least one ratchet wheel6and the opening332of the sliding member3. The cover8has a pivot pin81formed thereon and axially extending toward the base5. The pivot pin81sequentially passes through the pivotal end of the adjuster37and the pivot hole51of the base5for connecting the cover8, the adjuster37and the base5together. The cover8has a second guiding slot83defined therein and located corresponding to the first guiding slot53of the base5. The second guiding slot83has a shape corresponding to the first guiding slot53. The protrusion341of the limiting member34passes through the second guiding slot83via the first guiding slot53for moving along the second guiding slot83. The cover8has two directional indicators84respectively disposed on two ends of the second guiding slot83.

A driving shaft7is partially received in the receiving space33. The driving shaft7sequentially passes through the shaft hole82of the cover8, the base5, the through hole61of the at least one ratchet wheel6to be rotatably connected to the opening332of the sliding member3. A rotating direction of the driving shaft7is indicated by the two directional indicators84. The driving shaft7has a channel71defined therein and axially extending therethrough. The channel71is coaxial with the opening332. One end of the driving shaft7has a plurality of flanges72annularly formed on an outer periphery thereof and radially located around the outer periphery thereof for correspondingly engaging with the grooves62of the at least one ratchet wheel6.

The operation of the revolving screwdriver with ratchet structure in accordance with the present invention will be described in detailed below. As shown inFIGS. 4-5, when the user wants to change to a desired tool bit, the user rotates the revolving cylinder4relative to the sliding member3until the corresponding containing hole42which the desired tool bit is received in is aligned with the sliding hole32and the opening332. And the sliding member3axially slides relative to the pushing rod2. The pushing rod2relatively moves along the sliding hole32, the aligned containing hole42of the revolving cylinder4, and the channel71of the driving shaft7, such that the desired tool bit is pushed to partially protrude from the channel71of the driving shaft7by the pushing rod2.

When the desired tool bit is ready to be operated, the user presses the teeth portion372of the adjuster37to pivotally move the adjuster37about the pivot pin81for controlling the one-way rotating direction of the driving shaft7. As shown inFIG. 6, when the adjuster37is pivotally moved in a clockwise direction, the protrusion341of the limiting member34is restricted by the driving hole371and is pivotally moved in the clockwise direction by the adjuster37. The corresponding rotator35is pressed by the limiting member34and the corresponding spring36is compressed by the corresponding rotator35for disengaging with the at least one ratchet wheel6. Therefore, the driving shaft7which engages with the at least ratchet wheel6is restricted by the other rotator35and is able to pivotally rotate in an anti-clockwise rotating direction. The driving shaft7ratchetably drives the desired tool bit. As shown inFIG. 7, when the adjuster37is pivotally moved in the anti-clockwise direction, the limiting member34is pivotally moved in the anti-clockwise direction by the adjuster37. The corresponding rotator35and spring36is pressed by the limiting member34for disengaging with the at least one ratchet wheel6. Therefore, the driving shaft7is able to pivotally rotate in the clockwise rotating direction.