Tyre Valve Air Chuck With Deflectable Fingers for Secure Sealing

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Solution Overview

Problem

Existing air chucks for pneumatic tires require manual effort and alignment to achieve an effective seal, are prone to damaging the tire valve threads, and struggle with short threads or misalignment, leading to inefficiencies and potential damage.

Innovation Solution

An air chuck with a clamping mechanism featuring radially deflectable fingers and a sleeve member that adjusts aperture size for secure engagement with the tire valve, combined with an elastomeric seal and shutoff valve mechanism for wide-range sealing and automatic air control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed seal is used in the air chuck, then sealing contact can be achieved, but the operator must push the air chuck hard against the tyre valve and manually hold it in position, which is time-consuming and awkward

Engineering Contradiction:
Improvesealing contactVSAvoidmanual holding requirement
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent applies the dynamics principle by replacing the static fixed seal with a movable, spring-loaded seal that automatically adjusts its position. The seal is mounted on a shutoff valve mechanism that can move axially, allowing the seal to maintain continuous contact with the tyre valve surface without requiring manual pressure application. The spring mechanism provides automatic force application, eliminating the need for the operator to manually hold the air chuck in position.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements self-service through the spring-loaded seal mechanism that automatically maintains sealing contact. The spring continuously exerts force on the seal, causing it to self-adjust and maintain pressure against the tyre valve surface throughout the operation. This eliminates the need for operator intervention to maintain sealing pressure, allowing hands-free operation once the air chuck is attached.

Inventive Principle:
Principle #25Self-service

2Ease of operation

If a sprung loaded locking blade is used to retain the air chuck, then the air chuck can be secured to the tyre valve, but the blade can slip or jump over the thread under pressure, causing damage to the thread and losing sealing contact

Engineering Contradiction:
Improveautomatic retentionVSAvoidthread damage and seal loss
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The patent applies segmentation by dividing the single locking blade into multiple separate locking elements (typically three or more blades arranged radially). This segmentation distributes the locking force across multiple contact points on the tyre valve threads, preventing any single blade from slipping or jumping over the threads under pressure. Each blade independently engages with the threads, providing redundant locking capability.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements dynamics by making the locking blades flexible and spring-loaded rather than rigid. The blades can deflect and adjust their position dynamically to accommodate variations in thread engagement, ensuring reliable locking without excessive force that could damage the threads. The spring loading provides continuous pressure while allowing for elastic deformation to absorb misalignment.

Inventive Principle:
Principle #15Dynamics

3Device complexity

If the air chuck is designed for single-side engagement, then the structure is simple, but under pressure the blade can easily slip or jump over the thread, causing damage and air bypass

Engineering Contradiction:
Improvesingle-side engagement structureVSAvoidthread engagement stability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent resolves this contradiction by segmenting the single locking blade into multiple radial blades (typically three), maintaining relatively simple structure while significantly improving reliability. The multiple blades provide distributed engagement around the tyre valve stem, preventing slippage and thread damage under pressure while keeping each individual blade simple in design.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies dimensionality change by transitioning from single-side engagement to multi-radial engagement. Instead of one blade engaging from a single direction, multiple blades engage from different radial directions simultaneously, providing three-dimensional stability and preventing any single point of failure while maintaining overall structural simplicity.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

4Adaptability or versatility

If the tyre valve has very short threads, then the valve design is compact, but the locking blade cannot engage onto threads and the operator must manually hold the air chuck

Engineering Contradiction:
Improvecompatibility with short threadsVSAvoidmanual holding requirement
Core Design Contradiction:
Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent applies dynamics by using a spring-loaded seal mechanism that can automatically compensate for variations in thread length. The spring provides continuous axial force that pushes the seal against the tyre valve surface, and this force is maintained regardless of whether the threads are long or short. The dynamic spring mechanism adapts to different thread lengths automatically, eliminating the need for manual holding.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements universality by designing a seal mechanism that functions effectively across a wide range of thread lengths. The spring-loaded seal system is not dependent on specific thread length characteristics, making it universally applicable to different tyre valve designs whether they have long or short threads, thereby eliminating the need for operator intervention in either case.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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 hassle-free, secure, and airtight connections without manual holding, reduces thread damage, and accommodates various tire valve thread lengths, ensuring reliable air flow management.

Implementation Method 1

The shutoff valve mechanism is biased in the closed position by a biasing spring

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

The elastomeric seal and housing are dimensioned such that the outer wall of the elastomeric seal contacts the inner wall of the air outlet passage of the housing in a sliding sealing fit

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP3995367B1An air chuck
Publication Date: 2024.01.31 GURTECH
  • EP3995367B1 patent drawingFigure 1
  • EP3995367B1 patent drawingFigure 2A~2C
  • EP3995367B1 patent drawingFigure 3A~3C

AI summary

An air chuck (10) for facilitating the connection of a pneumatic hose with a threaded stem (70) of a tyre valve (12) includes a housing (20) with an air passage. The housing (20) includes an air inlet port connectable to the pneumatic hose, and an air outlet passage to receive the threaded stem of the tyre valve. A clamping member (36) is mounted externally about the outlet passage and includes a hollow tubular member, a front end portion of which terminates in a plurality of separate, radially deflectable fingers (38), a free end portion of each finger extending towards the discharge end of the outlet passage. The free end portions of each finger (38) define an aperture for receiving the threaded stem (70) of the tyre valve (12). The size of the aperture is variable by the movement of a sleeve (44), slidable over the body of the housing and the clamping member.