Digital Display Torque Wrench With Fast Linear Adjustment

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Solution Overview

Problem

Conventional torque wrenches face issues with inefficient and laborious torque adjustments due to environmental factors affecting accuracy and requiring screw-threading adjustments, which are slow and time-consuming.

Innovation Solution

A torque wrench with a digital display that converts rotational operation into linear movement for efficient torque adjustment, using a modulating member to drive a transmission gear, enabling quick and easy adjustment from minimum to maximum torque without spring resistance, and employing non-contact sensing for accurate torque value display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If screw-threading adjustment mechanism is used, then torque value can be adjusted, but adjustment process is slow and laborious

Engineering Contradiction:

Improvetorque adjustment easeVSAvoidadjustment time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent replaces the traditional screw-threading mechanical adjustment mechanism with a magnetic field-based adjustment system. The modulating member generates a magnetic field that directly interacts with the torsion force detecting unit, eliminating the need for mechanical threading and spring compression. This substitution dramatically reduces adjustment time and labor while maintaining precise torque control capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs periodic rotational movement of the modulating member to achieve torque adjustment. By rotating the modulating member in a periodic manner, the magnetic field varies correspondingly, enabling efficient torque value adjustment from minimum to maximum without the continuous circular rotation required by screw mechanisms.

Inventive Principle:

Principle #19Periodic action

2Measurement precision

If variable resistance is used for torque sensing, then digital display is achieved, but resistance is affected by environmental factors causing unstable voltage output

Engineering Contradiction:

Improvetorque value accuracyVSAvoidvoltage output stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the variable resistance mechanical sensing mechanism with a magnetic field-based sensing system. The torsion force detecting unit utilizes magnetic field interactions rather than electrical resistance changes, eliminating the susceptibility to environmental factors such as moisture and temperature that affect resistance stability. This ensures both accurate torque measurement and stable voltage output.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If spring-based push rod mechanism is used, then torque adjustment is achieved, but spring elastic force creates resistance slowing down adjustment speed

Engineering Contradiction:

Improveadjustment operation easeVSAvoidadjustment speed

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The patent eliminates the spring-based mechanical push rod mechanism entirely, replacing it with a magnetic field-based modulation system. The modulating member generates magnetic force that directly acts on the torsion force detecting unit without requiring compression of springs or overcoming elastic forces. This removal of spring resistance enables rapid torque adjustment while maintaining ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Facilitates efficient, time-saving, and labor-saving torque adjustments with high accuracy, resistant to environmental interference, and reduces wear and tear, enhancing user convenience and reducing manufacturing costs.

Implementation Method 1

The modulating member is configured to be rotated by the user to drive the moving member to generate a linear sliding relationship with respect to the main body

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 2

The torque sensing device is configured to sense a displacement variation of the moving member, so as to display a torque value on the display

Methodology Applied

Scientific EffectDisplacement sensing: Displacement

Data Source

PatentEP4230349B1Digital display torque wrench for easy torque adjustment

Publication Date: 2025.09.10 HU BOBBY

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AI summary

The present invention provides a torque wrench (100) with digital display for easy torque adjustment, including a main body (10), a wrenching member (20), a trigger mechanism (30), a torque adjustment device (40), and a torque sensing device (50). The torque adjustment device (40) includes an elastic member (41), a moving member (42), a transmission gear (43), and a modulating member (44). The modulating member (44) rotationally drives the transmission gear (43) to rotate, so as to drive the moving member (42) to generate a linear displacement, thereby adjusting the support position of the moving member (42) with respect to the elastic member (41), achieving an efficient torque value adjustment effect and purpose.