Bidirectional Ratchet Screwdriver for High-Torque Continuous Output

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Solution Overview

Problem

Existing screwdrivers with bidirectional output capabilities provide insufficient torque, necessitating manual adjustment of the screw or hand position to continue rotation cycles, and cannot meet the torque requirements in various work environments.

Innovation Solution

A manual tool design featuring a handle, main shaft, transmission device, ratchet tooth device, and ratchet wheel switching device, allowing the main shaft to rotate in the same direction regardless of handle rotation, with the ratchet wheel switching ring positioning to enable clockwise, anticlockwise, or fixed positions for bidirectional torque output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a ratchet screwdriver with bidirectional transmission is used, then the screwdriver can rotate bidirectionally, but the output torque is small and cannot satisfy work requirements

Engineering Contradiction:

Improvebidirectional rotation capabilityVSAvoidoutput torque

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The transmission system is divided into two independent transmission paths: a first transmission path for clockwise rotation and a second transmission path for anticlockwise rotation. Each path has its own ratchet gear, driving gear, and transmission components, allowing bidirectional rotation while maintaining sufficient torque output in each direction through optimized gear ratios and transmission efficiency.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the handle rotates in a finite number of cycles, then the screwdriver can be operated, but manual adjustment is required to continue rotation cycles

Engineering Contradiction:

Improverotation cycle continuityVSAvoidadjustment time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The ratchet mechanism ensures continuous useful action by allowing the handle to rotate in one direction while the ratchet gear maintains engagement with the driving gear. This continuous engagement eliminates the need for manual adjustment between rotation cycles, as the ratchet mechanism automatically maintains the screwdriver in a ready state for continuous operation.

Inventive Principle:

Principle #20Continuity of useful action

3Stability of the object's composition

If the main shaft rotates in the same direction regardless of handle rotation, then torque output is consistent, but bidirectional torque output is limited

Engineering Contradiction:

Improvetorque direction consistencyVSAvoidbidirectional torque output capability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The transmission system dynamically adapts the torque output direction based on the handle rotation direction. When the handle rotates clockwise, the first transmission path engages to produce clockwise torque output. When the handle rotates anticlockwise, the second transmission path engages to produce anticlockwise torque output. This dynamic adaptation ensures both torque direction consistency for each rotation direction and full bidirectional torque output capability.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables large torque output through bidirectional handle rotation, ensuring consistent torque direction without manual adjustments, enhancing usability in diverse work environments.

Implementation Method 1

the ratchet tooth device engages with the first ratchet wheel and the second ratchet wheel by an elastic force

Methodology Applied

Scientific EffectElastic force: Elasticity

Data Source

PatentEP4108382B1Manual tool capable of achieving bidirectional output of torque

Publication Date: 2025.12.03 HANGZHOU GREAT STAR IND CO LTD

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Figure 4a1~4c2

AI summary

Disclosed is a manual tool outputting torque bidirectionally. The manual tool includes a handle (100), a main shaft (200), a transmission device (300), a ratchet tooth device (400) and a ratchet wheel switching device (500), wherein when a ratchet wheel switching ring (501) of the ratchet wheel switching device (500) is located at a clockwise position, no matter whether the handle (100) rotates in a clockwise direction or in an anticlockwise direction, the main shaft (200) rotates in the clockwise direction to output torque from the handle (100); when the ratchet wheel switching ring (501) of the ratchet wheel switching device (500) is located at an anticlockwise position, no matter whether the handle (100) rotates in the clockwise direction or in the anticlockwise direction, the main shaft (200) rotates in the anticlockwise direction to output torque from the handle (100); and when the ratchet wheel switching ring (501) of the ratchet wheel switching device (500) is located at a fixed position, the main shaft (200) and the handle (100) rotate in the same direction to output torque from the handle (100), with the output torque being large. The manual tool outputting torque bidirectionally can output the torque by bidirectional rotation of the handle, with the output torque being large, while torque output by an existing screwdriver having bidirectional output is small.