Self-Reengaging Window Restrictor Arms for Casement Safety
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Solution Overview
Problem
Existing window opening control devices for casement windows do not effectively limit pivotal travel and lack a self-reengaging mechanism, posing safety risks and compliance issues with building codes.
Innovation Solution
A window opening control device comprising first and second restrictor arms with connectors that automatically couple in a compacted configuration, and a release mechanism that allows full opening while ensuring the device reengages automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window opening control device is installed to limit pivotal travel, then safety is improved by preventing accidental openings, but the window cannot be fully opened for emergency egress or access
Solution Approach 1:
The window opening control device transitions from a static limiting mechanism to a dynamic system that can automatically adjust its state. The self-reengaging mechanism dynamically responds to window position changes, automatically re-establishing the limit after temporary displacement, thereby providing both safety through continuous monitoring and adaptability through automatic adjustment.
Solution Approach 2:
The device performs self-reengagement without requiring manual intervention or external power sources. The mechanical self-reengaging mechanism automatically detects when the window has been displaced beyond the limited position and autonomously re-establishes the limitation, providing both safety through continuous operation and eliminating the need for user action to maintain protection.
2Adaptability or versatility
If a release mechanism is provided to allow full opening, then adaptability for emergency access is improved, but the device may be accidentally released or not reengaged by subsequent users
Solution Approach 1:
The device automatically reengages the restrictor arms after the window is closed, eliminating the need for manual reengagement by subsequent users. This self-reengaging mechanism ensures reliable and consistent protection without requiring user memory or action, thereby maintaining both emergency access capability when needed and reliable consistent protection through automatic operation.
Solution Approach 2:
The self-reengaging mechanism incorporates feedback from the window's position and movement. When the window is closed or returns to its limited position, the mechanism detects this state and automatically re-establishes the restriction, providing reliable feedback-based control that ensures consistent protection without manual intervention.
3Reliability
If restrictor arms are configured in an extended state to limit travel, then safety is improved, but the device occupies more space and may interfere with window operation
Solution Approach 1:
The restrictor arms transition between extended and compacted configurations based on window position. When the window is within the limited opening range, the arms extend to provide travel limitation for safety. When the window approaches the limited position, the arms automatically compact, reducing spatial occupation and preventing interference with normal window operation.
Solution Approach 2:
The restrictor arms nest within each other or fold into a compact configuration when not in use, similar to nested dolls. This nesting capability allows the device to occupy minimal space when the window is at its limited position while maintaining the ability to extend when needed for safety, thereby resolving the contradiction between protection and spatial occupation.
Data Source
AI summary
A window opening control device having first and second restrictor arms, each one being pivotally securable to a respective one of a window frame and a window sash and having a connector. The connector of the first restrictor arm being couplable with the connector of the second restrictor arm in a pivotable connector connexion. The first and second restrictor arms are configurable in a compacted configuration in which they are superposed to one another, and an extended configuration in which their connectors are coupled together to limit a pivotal travel of the window sash with respect to the window frame. The opening control device further includes a release mechanism actionable to disengage the first and the second connectors. In a closed configuration of the window sash with respect to the window frame, the first and second restrictor arms are configured in the compacted configuration and are automatically coupled together.