Ratchet wheel screw driver acting bidirectionally

Abstract

The invention discloses a ratchet wheel screw driver acting bidirectionally, and relates to the technical field of hardware tools, for solving the technical problems of improving the working efficiency and lowering the cost. The screw driver comprises a driver rod, a handle as well as a bidirectional transmission device and a reversing device, wherein the bidirectional transmission device comprises a middle shaft as well as two ratchet wheels and two driving gears arranged on the middle shaft; one of the two ratchet wheels and one of the two driving gears rotate synchronously with the middle shaft; the other ratchet wheel and the other driving gear can rotate relative to the middle shaft; the two driving gears are in transmission connection through a first-stage transmission gear; the reversing device comprises a sleeve type knob and a ratchet cage which is arranged inside an inner ring of the knob and is capable of rotating relative to the knob; the handle is fixedly connected with the ratchet cage; four ratchet racks are arranged inside the ratchet cage; two of the ratchet racks can be meshed and separated from one of ratchet gears under the control of the knob; the other two ratchet racks can be meshed and separated from the other ratchet gear under the control of the knob. The screw driver disclosed by the invention is long in service life.

Description

technical field [0001] The invention relates to hardware tool technology, in particular to a bidirectional ratchet screwdriver technology. Background technique [0002] For existing hand tools such as screwdrivers and torque wrenches, the rotation axis of the handle is coaxial with the main shaft. Since the rotation of the hand has a certain limit, it cannot always rotate in one direction. Turn the handle of the tool in the desired direction, then counter-rotate the hand, and then reposition the tool to enter the next cycle. A one-way device such as a ratchet mechanism makes the main shaft not move when the handle is reversed, or the hand tool can be disengaged from the screw and then reinserted into the screw to rotate. But in any case, the reverse rotation of the hand will not bring effective movement of the fastening screw, so the reverse rotation of the hand becomes a wasted action, and its operating efficiency is low. [0003] In order to overcome the defects of exist...

AI Technical Summary

Problems solved by technology

However, in this two-way mechanical converter, the two-way transmission device is installed on the reversing device. The size of the gear set is limited by the reversing device and only small gears can be used, which cannot achieve high-speed output, which affects the further improvement of the screwdriver's operating efficiency. It also has high requirements on the material of the gear, and the cost of the gear set is correspondingly high, and this two-way mechanical converter adopts the friction ratchet method for reversing. However, the friction ratchet method is limited by factors such as material and torque. subject to wear and short service life

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