Double-Door Lock Linkage for Synchronized Operation

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Solution Overview

Problem

Existing double-door lock assemblies require separate operation and occupy more space when doors open in different directions, making them inconvenient for simultaneous opening or closing.

Innovation Solution

A double-door lock assembly with interconnected linkage members between first and second locks on each door, allowing simultaneous rotation and operation of both doors in the same direction via handle groups, enabling synchronized opening or closing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate locks are mounted on each door for burglar-proof security, then security reliability is improved, but operation convenience deteriorates because doors must be opened sequentially

Engineering Contradiction:

ImprovesecurityVSAvoidoperation convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent combines two separate lock operations into a single synchronized operation by connecting the first linkage member and second linkage member. When one handle group is rotated, the linkage members transmit the rotational force to both rotation members simultaneously, enabling both doors to be opened or closed at the same time while maintaining separate lock mechanisms for security.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The linkage members act as intermediary mechanical elements that transfer rotational motion between the two independent lock systems. The first linkage member on the first door and the second linkage member on the second door connect through mechanical engagement, allowing the rotation of one handle to operate both locks without directly coupling the handle groups.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If doors are designed to open in different directions for security, then burglar-proof capability is improved, but space requirement increases

Engineering Contradiction:

Improveburglar-proof capabilityVSAvoidspace requirement

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent inverts the conventional approach by enabling both doors to open in the same direction (inward or outward) rather than in opposite directions. This is achieved through the synchronized operation mechanism where both doors can be opened simultaneously toward the same side, reducing the space required while maintaining security through the coordinated lock system.

Inventive Principle:

Principle #13The other way round (Inversion)

3Adaptability or versatility

If separate handle groups control each door independently, then operational flexibility is improved, but synchronization capability deteriorates

Engineering Contradiction:

Improveoperational flexibilityVSAvoidsynchronization capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent merges the operational control of two independent doors into a synchronized system while preserving the independence of handle groups. The linkage members enable both doors to be operated simultaneously when needed, while still allowing individual door operation when required, thus combining synchronization capability with operational flexibility.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10233669B2Double-door lock assembly

Publication Date: 2019.03.19 TAIWAN FU HSING INDUSTRIAL CO LTD

AI summary

A double-door lock assembly includes a first lock and a second lock which are respectively mounted on a first door and a second door. The double-door lock assembly utilizes a first linkage member of the first lock to connect a second linkage member of the second lock to allow the first and second locks to co-operate. Hence the first and second doors can be opened or closed simultaneously in the same direction.