Espagnolette Fitting Opening Limiter With Movable Pin Guide
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Solution Overview
Problem
Existing opening limiting devices for windows face difficulties in easy insertion and removal of the guide pin due to precise alignment requirements, leading to potential operating errors and reduced reliability.
Innovation Solution
The design incorporates a guide web opposite the guide slot to facilitate easy insertion and removal of the guide pin by pivoting the pivot arm away from the guide bar, and includes a movable pin guide and pin lock to control the guide pin's movement, ensuring reliable operation and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide pin and guide slot are positioned precisely one above the other for insertion, then the connection is secure, but the insertion and removal process becomes difficult and time-consuming
Solution Approach 1:
The guide web is positioned to automatically guide the guide pin into the correct alignment with the guide slot before insertion occurs. This preliminary guiding action eliminates the need for precise manual positioning, allowing the pin to be easily inserted and removed while maintaining secure connection during operation
Solution Approach 2:
The guide web acts as an intermediary element between the guide pin and the guide slot. It provides a controlled path that facilitates easy insertion and removal of the pin while ensuring proper alignment, thereby resolving the contradiction between secure connection and ease of operation
2Stability of the object's composition
If the guide slot is closed on one side to secure the guide pin, then the connection is stable, but the guide pin cannot be removed for inspection or maintenance
Solution Approach 1:
The guide web is designed to be movable relative to the guide slot, allowing it to switch between blocking the slot (protruding position) and allowing access (retracted position). This dynamic design enables the system to maintain stability during operation while allowing inspection and maintenance when needed
Solution Approach 2:
The guide web blocks the guide slot only partially - enough to secure the guide pin during normal operation, but not completely, as it can be moved to a retracted position to allow the guide pin to be removed for inspection or maintenance purposes
3Ease of repair
If the guide pin is easily removable from the guide slot, then maintenance is simplified, but operating errors may occur due to accidental removal
Solution Approach 1:
The guide web provides dynamic control over guide pin accessibility - it automatically blocks the guide slot during normal operation to prevent accidental removal, but can be moved to a retracted position when maintenance is intended, thus balancing ease of repair with operational reliability
Solution Approach 2:
The system provides feedback through the guide web's position - when the guide web is in its protruding position, it signals that the guide pin is secured and cannot be accidentally removed. When the guide web is retracted, it signals that maintenance mode is active and removal is permitted
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An opening-limiting device (3) for a connecting rod fitting (5) of a leaf (2) pivotable against a frame (1) has a guide web (14) for guiding a guide pin (12) relative to a guide slot (11). A pin guide (20) can be moved between a position parallel to the guide web (14) and a retracted position via a drive of the connecting rod fitting (5), thus controlling the release of the guide pin (12) relative to the guide slot (11). This makes the opening-limiting device (3) particularly reliable.