Espagnolette Fitting with Adjustable Ramp for Ventilation Security
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Solution Overview
Problem
Existing espagnolette fittings have fixed opening widths and limited security in gap ventilation positions, often requiring special components and complex designs, with only single locking pins providing limited security and additional hinges having limited load capacity.
Innovation Solution
The espagnolette fitting features a movable ramp attached to an adjusting piece below a cover plate, allowing adjustable parking width and increased security with multiple locking pins in the gap ventilation position, enabling identical locking plates to be used at various distances from the pivot axis, and includes a pivotable lever and adjustable locking slot sections for enhanced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed opening width is used in traditional espagnolette fittings, then the structure is simple, but the adaptability is limited and cannot accommodate different installation positions
Solution Approach 1:
The strike slot is designed with a movable section that can be adjusted along the rebate to different positions. This movable section includes a locking bolt that engages with adjustment elements on the sash, allowing the opening width to be dynamically adjusted according to the distance from the pivot axis while maintaining structural simplicity
Solution Approach 2:
The strike plate is divided into a stationary part and a movable part. The movable part contains the locking mechanism that can be positioned at different locations along the rebate, enabling multiple strike plates to be identically constructed yet adapted to different installation positions through the adjustable locking bolt position
2Reliability
If only a single locking pin is used in gap ventilation position, then the device complexity is low, but the security is limited
Solution Approach 1:
The strike plate design enables multiple locking bolts from different strike plates to simultaneously engage with the sash in the gap ventilation position. Each locking bolt engages with the movable section of the strike slot, creating multiple security points without requiring special components for each locking pin
3Adaptability or versatility
If strike plates are arranged at different distances from the pivot axis, then the adaptability increases, but with rigid cam guides the pivot angle varies causing inconsistency
Solution Approach 1:
The locking bolt is designed to move along a cam-shaped portion of the strike slot that is inclined relative to the rebate. This cam mechanism dynamically adjusts the locking bolt's position as the sash moves, ensuring that all locking bolts engage and disengage in a consistent sequence regardless of their distance from the pivot axis
Data Source
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AI summary
The invention relates to an operating bar fitting for windows, doors, or the like, comprising locking pins, which project from the operating bars and which, in a locking position, engage behind retaining shoulders (13, 39) of counter locking parts (10) on the frame side, and comprising a device for achieving a slightly open ventilation position (III) of the leaf (2) with respect to the frame (1) in one position of the operating bar actuation handle (6), said device being formed by an operating bar retaining pin which is moved into a receiving recess of a locking plate on the frame side via run-on sloping surfaces (35). The retaining pin is formed by at least one of the locking pins, and the locking plate (10), on the frame side, has a locking slot (11), behind which the retaining pin engages in the locking position (I), and a run-on sloping surface (35) which is offset inwards and which, in the slightly open position, pushes the locking pin away over a plane running ahead of the retaining shoulder (13) away from the rebate. The run-on sloping surface (35) can be adjusted in order to provide a secured slightly open ventilation position.