Semi-fixed Wing Double Door Lock with Pivoting Lever

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Solution Overview

Problem

Existing fixed leaf locks for double-leaf doors require complex installation processes, including milling and assembly at the assembly site, due to their large size and need for separate folding levers, which complicates handling and increases costs.

Innovation Solution

Designing a pivoting lever actuating mechanism that operates parallel to the door's surface, allowing the fixed leaf lock to be attached directly to the additional profile without pre-milling, and using a single actuating lever to control both drive rods for locking and unlocking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a folding lever mechanism is used for actuating the fixed leaf lock, then the locking function is achieved, but the device requires a relatively large amount of space and complex installation with pre-milling

Engineering Contradiction:

Improvelocking functionVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The actuating lever is changed from a folding lever that pivots in the plane of the door to a lever that pivots essentially perpendicular to the plane of the door (in the thickness direction). This dimensional change allows the lever to operate within the limited space of the additional profile without requiring pre-milling of the additional profile, thereby simplifying installation while maintaining the locking function

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If separate folding levers are used for each drive rod, then each rod can be controlled independently, but the device complexity and handling difficulty increase

Engineering Contradiction:

Improveindependent controlVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Two separate folding levers that would normally be required for independent control of the two drive rods are merged into a single actuating lever. This single lever pivots perpendicular to the door plane and transmits force to both drive rods through a connecting mechanism, reducing the number of components and simplifying handling while still enabling independent control of each rod through the lever's motion

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If the fixed leaf lock is installed in the Eurogroove channel with separate assembly steps, then the lock can be assembled, but the installation process becomes complicated with multiple steps

Engineering Contradiction:

Improveassembly capabilityVSAvoidinstallation speed

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The actuating lever is designed with integrated mounting features that allow it to be directly mounted to the additional profile without requiring pre-milling or complex preparation. The lever's design includes pre-formed mounting elements that engage with the additional profile's structure, enabling quick installation in a single step and significantly improving installation productivity

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP1970513B1Semi-fixed wing of a double door and a lock for the semi-fixed wing

Publication Date: 2012.10.17 CARL FUHR GMBH & CO

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AI summary

A doorframe has two side-by-side doors ('French windows') with hinges. One first door is fitted with a hand-height lever-operated door-lock. The hand lever is further connected by vertical pushrods top and bottom that engage with matching sockets in the doorframe to secure the second door. The pushrods run through vertical grooves in both the first and second doors.