Pivoting Sash Positioning Device with Selective Locking
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Solution Overview
Problem
Existing sash opening devices lack a simple mechanism to activate and deactivate the function of limiting sash deployment and do not allow for easy retrofitting to existing windows or patio doors, with complex component arrangements that hinder concealed installation of essential parts.
Innovation Solution
A stop element is fixed in an intended position within an elongated hole, allowing selective release or blocking of the swivel arm movement, enabling easy activation/deactivation of the sash deployment and allowing for a separately controllable closure, with a structurally simple design that includes a slot for guiding the locking element and a ratchet for adjustable increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a swivel arm with a slot for a locking element is used, then the structural simplicity is improved and retrofittability is enhanced, but the ability to selectively limit sash deployment is insufficient
Solution Approach 1:
The fixing element is designed to be movable along the slot, transitioning between a first position that blocks swivel arm movement (limiting deployment) and a second position that releases movement (allowing full opening). This dynamic positioning capability enables selective activation/deactivation of the deployment limitation function while maintaining structural simplicity.
Solution Approach 2:
The fixing element is separated from the swivel arm assembly, allowing it to be independently positioned along the slot. This segmentation enables the fixing element to selectively engage at different positions to limit deployment to specific angles or fully open positions, providing versatility without increasing overall structural complexity.
2Reliability
If multiple individual components are mounted on the frame and sash, then the locking function is achieved, but the device complexity increases and concealed arrangement becomes impossible
Solution Approach 1:
The fixing element integrates multiple functions into a single component: it serves as both the locking mechanism (by engaging with the swivel arm at specific positions) and the deployment limiter (by blocking movement when positioned at the first location). This merging reduces the number of individual components needed while maintaining reliable locking and limiting functions.
Solution Approach 2:
The fixing element is designed with multi-functionality, capable of both limiting sash deployment to predetermined angles and providing secure locking when engaged with the swivel arm. This universal component replaces what would traditionally require separate limiting and locking mechanisms, reducing overall device complexity.
3Adaptability or versatility
If the fixing element can be positioned at different locations in the slot, then the adaptability for different opening widths is improved, but the mechanism complexity increases
Solution Approach 1:
The fixing element is designed to be manually positionable along the slot without requiring additional actuating mechanisms. The user can directly move the fixing element to different positions to achieve desired opening widths, and the element maintains its position through its own structural design (such as engagement features with the slot), eliminating the need for complex positioning mechanisms.
Data Source
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AI summary
An opening device (5) for a sash (2) that pivots against a frame (1) has a fixing element (17) for selectively blocking or releasing the movement of a pivot arm (8) that follows the movement of the sash (2) and is mounted on the frame (1). Furthermore, a positive locking of the sash (2) with the pivot arm (8) can be selectively created or released. This allows the sash (2) to be locked in the frame (1), pivoted out a short distance, or fully opened.