Reinforced Torque Wrench Handle Locking Against Lateral Damage

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Solution Overview

Problem

Conventional torque wrenches with plastic handles are prone to deformation, cracking, or crushing due to user operation errors, leading to a reduced service life.

Innovation Solution

A torque wrench design featuring a plastic handle with a metal reinforcing member and a locking unit that includes a positioning groove and a control bushing to prevent damage from lateral forces, ensuring the handle remains locked or unlocked as needed, using metal reinforcing members to resist deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If the handle is made of plastic material for weight reduction, then the weight of the torque wrench is reduced, but the handle becomes susceptible to deformation, cracking, or crushing when lateral force is applied

Engineering Contradiction:

Improveweight of torque wrenchVSAvoidresistance to lateral force

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The handle is constructed as a composite structure combining plastic material with an embedded metal reinforcing member. The plastic provides lightweight properties while the metal member embedded within provides high strength and resistance to lateral forces, resolving the contradiction between weight reduction and strength enhancement.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal reinforcing member is strategically positioned at the positioning portion of the handle where lateral forces are most likely to be applied. This localized reinforcement provides strength exactly where needed without adding excessive weight to the entire handle structure.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If a locking member is accommodated in a perforation of the plastic handle for locking functionality, then the handle position can be locked, but the perforation becomes vulnerable to deformation, cracking, or crushing

Engineering Contradiction:

Improvelocking functionalityVSAvoidservice life of torque wrench

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The positioning portion containing the perforation is reinforced with a metal member that has a positioning hole. This composite structure maintains the locking functionality through the positioning member while the metal reinforcement prevents the perforation from deforming, cracking, or crushing under lateral forces.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal reinforcing member is pre-installed in the positioning portion before the locking operation. This beforehand reinforcement cushions and protects the perforation from potential damage during subsequent locking or operational errors, extending the service life of the torque wrench.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If the positioning hole is made large enough to accommodate the positioning member, then the locking unit can function properly, but the plastic handle becomes more susceptible to damage

Engineering Contradiction:

Improvepositioning member accommodationVSAvoidresistance to lateral force at positioning hole

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The positioning hole is formed in a metal reinforcing member that is embedded in the plastic handle. The metal material allows for a sufficiently large positioning hole to accommodate the positioning member while maintaining high resistance to lateral forces, unlike plastic which would be vulnerable at the same hole size.

Inventive Principle:

Principle #40Composite materials

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 design provides a lightweight, durable torque wrench that prevents damage from user errors, maintaining structural integrity and extending the tool's lifespan.

Implementation Method 1

The trip unit is connected to the elastic member. The elastic member elastically pushes the trip unit against the force-receiving portion.

Methodology Applied

Scientific EffectElastic force: Elasticity

Implementation Method 2

the reinforcing member can effectively resist a lateral force transmitted from the positioning member since it is made of metal and has high rigidity

Methodology Applied

Scientific EffectRigidity:

Data Source

PatentUS20260077459A1Torque wrench

Publication Date: 2026.03.19 TORQUE TECH PRECISION

AI summary

A torque wrench includes a tubular body and a handle rotatably connected to one end of the tubular body. The tubular body has at least one positioning groove. The handle is made of a plastic material and has a reinforcing member made of metal and corresponding to the positioning groove. The reinforcing member has a positioning hole. A positioning member is accommodated in the positioning hole. A control bushing is slidably sleeved onto the handle. The control bushing can press and force the positioning member to partially extend out of the positioning hole and to be engaged in the positioning groove. In light of this, the torque wrench can effectively avoid damage caused by a user's operation error.