Opening Restrictor With Engagement Recess For Multi-Axis Sash Control
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Solution Overview
Problem
Existing opening limiters for windows and doors with pivoted sashes are limited in allowing further sash positions beyond the initial opening-limiting position, particularly around additional pivot axes, and require expensive frame and wing components, lacking control over espagnolette fittings.
Innovation Solution
The design features a holding arm with an engagement recess open at its free end, equipped with a barrier for access and locking, allowing the coupling bolt to move into the recess and lock in place, enabling movement around vertical or horizontal pivot axes, and incorporating a spring-loaded lock and adjustable screw for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional opening limiter is used to fix the sash in the opening-limiting position, then the sash can be locked in place, but the sash cannot move beyond the opening-limiting position or around additional pivot axes
Solution Approach 1:
The engagement recess is divided into multiple regions: a first region for the coupling bolt in the opening-limiting position, and a second region allowing movement beyond the opening limit. The barrier element segments the passage opening to control access to these different regions, enabling flexible sash positioning while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention introduces movement in additional dimensions by allowing the coupling bolt to move not only in the opening-limiting position but also beyond it, and around additional pivot axes. The engagement recess is designed to accommodate these multi-dimensional movements, transforming a single-position lock into a multi-position flexible system.
2Adaptability or versatility
If expensive frame and wing parts are used to enable further sash positions, then the sash can move around additional pivot axes, but the cost and complexity increase
Solution Approach 1:
The engagement recess serves multiple functions: it accommodates the coupling bolt in the opening-limiting position, allows movement beyond the opening limit, and enables rotation around additional pivot axes. This multi-functional design eliminates the need for separate expensive components for each function, reducing overall manufacturing cost while maintaining versatility.
Solution Approach 2:
The barrier element acts as an intermediary component that controls the movement of the coupling bolt. It allows access to the engagement recess while preventing exit, enabling controlled movement around additional pivot axes without requiring expensive frame and wing modifications. The barrier element mediates between the simple structure and the complex movement requirements.
3Reliability
If the engagement recess is completely closed to prevent unauthorized movement, then security is improved, but the sash cannot move beyond the opening-limiting position
Solution Approach 1:
The barrier element provides localized closure of the passage opening, blocking access to the second region of the engagement recess while allowing the coupling bolt to enter through the opening. This local quality differentiation enables secure locking in the opening-limiting position while maintaining the ability to move beyond it when needed.
Solution Approach 2:
The system transitions from a static closed recess to a dynamic system where the coupling bolt can move between different regions of the engagement recess. The barrier element provides controlled access, allowing the system to adapt between secured locking and extended movement based on operational requirements.
4Device complexity
If a simple barrier is used to block the passage opening, then the structure remains simple, but the coupling bolt cannot access the engagement recess
Solution Approach 1:
The passage opening is designed with a specific geometry that allows the coupling bolt to enter the engagement recess through the opening before being blocked by the barrier element. This preliminary action of entering through the opening is enabled by the strategic positioning and shaping of the passage opening, balancing simplicity with operational ease.
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
This solution allows for flexible movement of the sash around multiple pivot axes, maintains the functionality of conventional turn-tilt fittings, and provides adjustable locking to prevent unauthorized movement, enhancing safety and reducing component complexity.
Implementation Method 1
The catch on the passage opening consists of a spring-loaded element which is arranged on the side wall of the engagement recess
Data Source
AI summary
The aperture delimiter (4) has a support arm (6) that includes an engagement recess which opens a passage opening. A test arrangement is coupled in the recess with a wing-side coupling bolt remote from the arm. A driving rod (13) is displaceable in the recess in several switching positions. A barrier is arranged in the recess at the free end of the arm and opened to the opening to permit engagement of the rod in the recess and to restrict disengagement of the rod after passing through the barrier.