Fenestration Lock Sensor Tether Retrofit
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Solution Overview
Problem
Existing fenestration unit monitoring systems require modifications to the lock assembly when retrofitting, which can be aesthetically unpleasing and may void warranties, and they do not efficiently monitor the locked or unlocked status of existing fenestration units.
Innovation Solution
A fenestration unit monitoring apparatus with a tether system that includes a lock status sensor positioned underneath the lock assembly and a panel position sensor, allowing for easy retrofitting without altering the existing lock assembly, using conductors on a tether to connect sensors to a controller for status indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing monitoring systems are retrofitted to fenestration units, then monitoring capability is improved, but the lock assembly height increases and aesthetics deteriorate
Solution Approach 1:
The monitoring system is divided into separate functional components: a monitor housing mounted on the frame member, a lock status sensor positioned on the tether beneath the lock assembly, and a panel position sensor in the monitor housing. This segmentation allows the monitoring functionality to be distributed rather than concentrated in one location, enabling the lock assembly to maintain its original height and appearance while still providing comprehensive monitoring capabilities.
Solution Approach 2:
A tether is introduced as an intermediary element that connects the monitor housing to the lock assembly. The tether serves as a flexible connection medium that allows the lock status sensor to be positioned beneath the lock assembly without increasing its height, while maintaining electrical connection through conductors embedded in the tether. This intermediary enables the system to achieve monitoring functionality without compromising the aesthetic appearance of the lock assembly.
2Measurement precision
If lock status sensor is positioned within lock assembly, then monitoring accuracy is improved, but installation complexity increases
Solution Approach 1:
The tether is designed to be flexible and rotatable, allowing the lock status sensor to be dynamically positioned in the optimal location beneath the lock assembly for accurate detection. The rotatable connection at the monitor housing enables the tether to adapt to different installation configurations, simplifying the installation process while maintaining the ability to position the sensor for maximum monitoring accuracy.
Data Source
AI summary
The fenestration unit monitoring apparatus with tethers are configured to retrofit an existing fenestration unit to incorporate components that are capable of monitoring the locked or unlocked status of the existing lock assembly and/or the panel position status of a movable panel of the fenestration unit. The fenestration unit monitoring apparatus include a lock status sensor located on a tether such that the lock status sensor can be positioned within an existing fenestration unit lock assembly when a monitor housing of the fenestration unit monitoring apparatus is located on the fenestration unit adjacent the fenestration unit lock assembly.