Truck Door Latch-Striker Extraction to Release High-Friction Seals

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Solution Overview

Problem

Existing latch and striker systems for truck or semitrailer doors, particularly those with large elastomeric seals, require significant manual effort to overcome friction and release seals during opening, making it cumbersome for operators.

Innovation Solution

A latch and striker system with a male part and engagement portion that pivots to unlock, featuring a hooking member and locking protrusions, allowing for increased extraction distance and reduced friction by disengaging seals efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If large elastomeric seals are used to provide good sealing performance, then sealing quality is improved, but friction between the door and frame increases significantly

Engineering Contradiction:

Improvesealing performanceVSAvoidfriction force

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The latch is designed to perform a preliminary extraction action on the striker before the door is fully opened. The distal end of the latch engagement portion engages the guide surface of the striker and pushes the latch axis away from the fastening surface by at least 50mm, thereby preliminarily separating the door edge from the seal contact zone and reducing the friction force that the operator must overcome.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the latch extraction distance is increased to release seals effectively, then ease of operation is improved, but the complexity of the latch mechanism increases

Engineering Contradiction:

Improvedoor opening easeVSAvoidlatch mechanism complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The latch mechanism utilizes a two-dimensional movement path combining rotation about axis A and translation along axis B. The engagement portion rotates about axis A while simultaneously translating along axis B to engage the guide surface, creating a compound motion that achieves the required extraction distance without requiring additional complex components or mechanisms.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Force

If the latch pivots further to increase extraction distance, then friction reduction is improved, but the risk of damaging the seal increases

Engineering Contradiction:

Improvefriction forceVSAvoidseal damage risk

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The guide surface on the striker acts as an intermediary element between the latch and the door seal. It provides a controlled path for the latch distal end to push against, ensuring that the extraction force is applied in a controlled manner through the fastening surface rather than directly to the seal, thereby reducing the risk of seal damage while achieving effective friction reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260015898A1Latch and striker system and opening and closing device including such a system

Publication Date: 2026.01.15 THIRIET

AI summary

A latch and striker system for an opening and closing device of a body door of a truck or semitrailer, the system includes a latch (P) and a striker (G), the door being configured to move from an open position to a closed position, by hinging of the door, the opening and closing device configured to move from a locked state for which the latch comes to the engaging and locking position in the striker (G) to an unlocked state (EDV), by pivoting of the control bar, allowing a gap between the latch and the striker of an extraction distance (DE) of more than 75 mm.