Vehicle Armrest Latch With Buttonless Release and Inertia Lock

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Solution Overview

Problem

Existing vehicle armrests require a button or paddle to release the latch system, limiting the design flexibility of the armrest surface.

Innovation Solution

A buttonless latching system with integrated inertia lock that allows the armrest/lid to be latched in the closed position and opened by pulling upwards, utilizing a spring-assisted mechanism and an inertia member to meet safety regulations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a button or paddle is used to release the latch system, then the latch can be reliably controlled, but the armrest surface design is limited

Engineering Contradiction:

Improvearmrest surface design flexibilityVSAvoidlatch release mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The button or paddle release mechanism is completely removed from the armrest surface. The release function is extracted and integrated into the latch member itself, which automatically releases when pulled upward. This eliminates the need for separate release components on the surface while maintaining reliable latch control.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The latch member is designed to automatically release when subjected to upward pull force. The cam surfaces and pawl mechanism work together to provide automatic release functionality without requiring a separate button or paddle actuation. The system serves itself by converting the opening action directly into the release mechanism.

Inventive Principle:

Principle #25Self-service

2Ease of operation

If the latch member is made movable to unlatched position, then the armrest can be opened, but safety regulations may be compromised without inertia lock

Engineering Contradiction:

Improvearmrest opening operationVSAvoidsafety regulation compliance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The inertia lock mechanism is merged with the latch assembly, with the inertia member integrated alongside the pawl and cam surfaces. This combination ensures that the simple upward pull operation for opening is coupled with automatic safety locking functionality, meeting both ease of operation and safety regulation requirements simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The inertia member acts as an intermediary between the latch member movement and the release mechanism. It responds to vertical acceleration forces and prevents unintended release by mediating the interaction between the cam surfaces and pawl, ensuring safety compliance while allowing legitimate opening operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If cammed engagement surfaces are used for latching, then secure latching is achieved, but the mechanism complexity increases

Engineering Contradiction:

Improvelatching securityVSAvoidcammed engagement mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cammed engagement surfaces serve multiple functions: they provide secure latching engagement, enable automatic release through cam action, and work with the inertia member for safety locking. This multi-functionality reduces the need for separate mechanisms while maintaining reliable latching security.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of using complex locking surfaces that require precise alignment and multiple components, the invention uses cammed surfaces that rely on geometric transformation of force directions. The cam profiles convert pulling motion into lateral movement that automatically engages or disengages the latch, simplifying the mechanism while maintaining security.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enables the armrest/lid to be opened without a physical button or paddle, maintaining design flexibility while adhering to safety standards.

Implementation Method 1

A latch assembly disposed along a second one of the two opposing side edges and including a latch member biased by a spring toward a latched position

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

An inertia member responsive to a vertical acceleration to prevent the latch member from moving to the unlatched position

Methodology Applied

Scientific EffectInertia: Inertia

Implementation Method 3

A finger is attached to the lid and adapted to engage the latch member, the finger includes a first cammed engagement surface and a second cammed engagement surface and the latch member including a third cammed engagement surface and a fourth cammed engagement surface

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS20250303972A1Buttonless latching system for vehicle armrest

Publication Date: 2025.10.02 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A buttonless latching assembly keeps a spring assisted armrest closed due to the relative shape and interaction of a set of pawls and allows the armrest to be opened simply by pulling up on the armrest without the need for a user actuated release button. An internal inertia locking device prevent the lid from being opened when the vehicle experiences upward acceleration.