Torsion Spring Protective Covering for Trigger Assembly

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Solution Overview

Problem

Electrical devices, such as power tools, face issues with torsion springs in trigger assemblies being damaged by moisture and dust, which compromises their functionality and reduces the tool's lifespan.

Innovation Solution

A protective covering for the torsion spring in the trigger assembly, featuring a tubular-shaped configuration with a curved portion and attachment mechanism, is designed to prevent ingress of dust and water, using materials like rubber or elastomeric materials for secure and easy attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the torsion spring is exposed in the trigger assembly, then the locking mechanism can operate freely and easily, but the torsion spring is vulnerable to damage from moisture and dust

Engineering Contradiction:

Improveprotection of torsion springVSAvoidstructure of trigger assembly

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective covering is fitted over the torsion spring, nesting the spring inside the covering. This allows the spring to be protected from environmental contaminants while maintaining its functional operation, resolving the contradiction between protection and operational freedom

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

A flexible protective covering is used to enclose the torsion spring. The covering material allows for movement and rotation of the locking member while providing a barrier against moisture and dust, thus protecting the spring without restricting the locking mechanism's operation

Inventive Principle:

Principle #30Flexible shells and thin films

2Duration of action of stationary object

If a protective covering is added to the torsion spring, then the lifespan of the electrical device is extended, but the device complexity increases

Engineering Contradiction:

Improvelifespan of electrical deviceVSAvoidtrigger assembly structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The covering is designed to fit over the existing torsion spring structure, nesting it within the protective layer. This approach extends the device lifespan by protecting against corrosion while adding minimal structural complexity, as the covering integrates with rather than complicates the existing assembly

Inventive Principle:

Principle #7Nested doll (Nesting)

3Adaptability or versatility

If the locking member is made rotatable for selective locking, then the trigger assembly gains adjustable locking positions, but the complexity of the locking mechanism increases

Engineering Contradiction:

Improvelocking positionsVSAvoidlocking assembly structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The locking member is designed to be rotatable rather than fixed, allowing it to assume different angular positions for selective locking. This dynamic element provides adjustability and versatility in locking positions while maintaining relatively simple structural implementation through rotational movement

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10892122B2Trigger assembly with a protective covering

Publication Date: 2021.01.12 DEFOND COMPONENTS

AI summary

A covering for a trigger assembly of an electrical device, said covering being configured for at least partially covering a torsion spring of the trigger assembly so as to alleviate ingress of dust, water and other particulates in to contact with the torsion spring.