Modular Strike Box Ejector Adaptation for Double-Leaf Door Locks

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing strike boxes for double-leaf doors face challenges in adapting to varying gap and distance dimensions between the active and passive leaf locks, leading to complex and costly manufacturing and assembly due to the need for different designs for different distance dimensions.

Innovation Solution

A modular strike box design featuring a first ejector with a carrier and detachable ejector element that can be mounted in different positions to accommodate varying distance dimensions, allowing adaptation to different active leaf locks without modifying the entire lock mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If different strike box designs are used for different distance dimensions, then adaptation to various active leaf locks is achieved, but manufacturing and assembly complexity increases

Engineering Contradiction:
Improveadaptation to different distance dimensionsVSAvoidmanufacturing and assembly complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The strike box is segmented into modular components: a base body and interchangeable adapter elements. Each adapter is designed for a specific distance dimension (e.g., 72mm or 92mm), allowing the same base strike box to adapt to different active leaf lock configurations by simply changing the adapter module rather than the entire strike box design.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The base strike box body is designed as a universal component that can work with multiple types of active leaf locks regardless of distance dimension. The universal base combines with specific adapters to achieve compatibility across different door configurations, reducing the need for completely different strike box designs.

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

2Reliability

If different strike box designs are used for different distance dimensions, then proper panic function is ensured, but manufacturing costs increase

Engineering Contradiction:
Improvepanic function reliabilityVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

By segmenting the strike box into a universal base and specialized adapters, manufacturing costs are reduced through economies of scale. The universal base can be mass-produced once and reused across multiple configurations, while only the relatively simple adapters need to be varied for different distance dimensions.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The modular adapter design allows for easy replacement and reuse. When adapting to different distance dimensions, the universal base is retained and reused, while only the adapter portion is changed or discarded, reducing overall manufacturing waste and cost.

Inventive Principle:
Principle #34Discarding and recovering

3Adaptability or versatility

If the entire lock mechanism is modified to accommodate varying gap dimensions, then adaptation is achieved, but device complexity and costs increase

Engineering Contradiction:
Improveadaptation to varying gap dimensionsVSAvoidlock mechanism complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The adaptation function is extracted from the main lock mechanism and placed into separate, interchangeable adapter elements. This allows the core lock mechanism to remain simple and unchanged, while the adapters handle the variability in gap dimensions and distance configurations.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The lock system is divided into the main mechanism and separate adaptation components. This segmentation allows the main mechanism to remain standardized and simple, while the adapters provide the necessary adaptation without complicating the core locking function.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentEP4575152A1A countercase
Publication Date: 2025.06.25 CARL FUHR GMBH & CO
  • EP4575152A1 patent drawingFigure 1
  • EP4575152A1 patent drawingFigure 2~3
  • EP4575152A1 patent drawingFigure 4~5

AI summary

The invention relates to a strike box (8, 8') for a passive leaf lock (7) of a double-leaf door, with - a housing (11), - an actuating device (12), e.g. a lock nut, for unlocking the passive leaf lock (7), - a first ejector (13), - a second ejector (14), wherein the first ejector (13) and the second ejector (14) can be pressed against locking elements (5, 6) of a moving leaf lock (3, 3') opposite the passive leaf lock (7) by actuating the actuating device (16), and in the process press the locking elements (5, 6) of the moving leaf lock (3, 3') out of the housing (11) of the strike box (8).The counter box is characterized in that at least the first ejector (13) has a carrier (23) and an ejector element (24) which is detachably fastened to the carrier (23) and which presses against the locking element (5) of the active leaf lock (3) during the actuation of the actuating device (12), wherein the ejector element (24) can be optionally mounted on the carrier (23) of the first ejector (13) in at least two different mounting positions with different distances (A1, A2) from the second ejector (14).