Digital-Display Torque Wrench With Mechanical Locking Adjustment

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Solution Overview

Problem

Existing torque wrenches experience looseness and distortion in torque performance due to flexible components, leading to inaccurate readings before reaching the set torque value.

Innovation Solution

A digital-display torque wrench with a locking device that secures the main body and sliding member, using a specially-shaped elastic member and torque-adjusting device to ensure precise torque measurement, featuring a locking mechanism that prevents jiggle and distortion during operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the torque wrench uses a flexible elastic member and slidable assembly for torque adjustment, then the torque value can be adjusted, but the structure becomes loose and inaccurate during operation

Engineering Contradiction:

Improvetorque adjustment capabilityVSAvoidtorque performance accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent employs a dynamic locking mechanism that transitions between locked and unlocked states. The locking member can engage with the sliding member to lock it in position, or disengage to allow adjustment. This dynamic state change enables the structure to be adjustable during setup but rigid during operation, resolving the contradiction between adaptability and reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The locking member acts as an intermediary element between the sliding member and the main body. When engaged, it transmits and maintains the adjusted position of the sliding member, preventing unwanted movement. This intermediary locking mechanism ensures that the flexible elastic member's adjustment capability is maintained while eliminating structural looseness during torque application.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the sliding member is made slidable for torque adjustment, then torque can be rapidly adjusted, but the sliding member jiggles and causes structural looseness

Engineering Contradiction:

Improvetorque adjustment speedVSAvoidstructural stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The system dynamically switches between two states: a slidable state during adjustment where the locking member is disengaged, allowing rapid torque modification; and a locked state during operation where the locking member engages with the sliding member, preventing jiggling and ensuring structural stability. This dynamic transition resolves the contradiction between ease of adjustment and structural stability.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If the elastic member is made flexible for torque adjustment, then the torque range can be adjusted, but the counterforce causes the elastic member to flex and lead to distortion

Engineering Contradiction:

Improvetorque range adjustmentVSAvoidtorque measurement precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The locking mechanism dynamically restricts the movement of the sliding member during torque application. When locked, the sliding member cannot move even though the elastic member remains flexible, preventing the counterforce from causing distortion. This allows the elastic member to maintain its flexibility for adjustment while the locking mechanism ensures measurement precision during operation.

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

The wrench provides accurate and compact torque performance with quick tripping and rapid torque adjustment, maintaining precision and preventing structural looseness.

Implementation Method 1

the counterforce transmitted to the biasing member through the driving portion makes it flexible

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the locking device results in frictional resistance between the sliding member and the main body, thereby preventing the sliding member from moving with respect to the main body

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250303537A1Digital-display torque wrench with mechanically adjustable torque

Publication Date: 2025.10.02 HU BOBBY

AI summary

A digital-display torque wrench with mechanically adjustable torque includes a main body, a wrenching device, a torque-breaking device, a specially-shaped elastic member, a torque-adjusting device, a locking device, and a torque-sensing device. The torque-adjusting device has a sliding member, which changes a set torque value of the digital-display torque wrench when sliding along a direction parallel to an axis of the main body. The locking device assembled between the sliding member and the main body can be switched between a releasing position and a locking position. At the releasing position, a bearing portion of the sliding member can move with respect to the specially-shaped elastic member, and the torque-sensing device senses a locational change of the sliding member and displays the set torque value. At the locking position, the locking device exerts a force on the sliding member to increase frictional resistance between the sliding member and the main body.