Breakaway Sash Lug for Double-Hung Windows
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Solution Overview
Problem
Conventional simulated sash lugs for modern double-hung windows are not user-friendly, as they require manual removal before tilting the upper sash for cleaning, risking damage to the window screen or sash lug.
Innovation Solution
A detachable breakaway sash lug assembly with a force-releasable coupling that automatically releases when the upper sash is tilted, preventing damage by allowing the lug to detach without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a simulated sash lug is attached to the upper sash for ornamental appearance, then the aesthetic value is improved, but the sash lug requires manual removal before tilting causing operational inconvenience and potential damage
Solution Approach 1:
The sash lug attachment system transitions from a static permanent attachment to a dynamic force-releasable coupling. The breakaway coupling allows the sash lug to remain attached during normal use but automatically releases when excessive force is applied during tilting, resolving the contradiction by making the attachment state changeable based on operational conditions.
Solution Approach 2:
The breakaway coupling enables the sash lug assembly to automatically detach itself when tilted, eliminating the need for manual removal before tilting. The system self-regulates by releasing when force exceeds the coupling's design threshold, improving ease of operation while maintaining ornamental appearance during normal use.
2Strength
If the sash lug is permanently attached to the upper sash, then structural support is improved, but damage risk increases when tilting the sash
Solution Approach 1:
The attachment system is segmented into two distinct components: the sash lug assembly and the breakaway coupling. This segmentation allows the ornamental sash lug to provide aesthetic value while the separate coupling mechanism provides controlled structural support that automatically releases under excessive force, reducing damage risk during tilting operations.
Solution Approach 2:
The breakaway coupling is designed with a predetermined failure force threshold that acts as a safety mechanism before damage can occur. When tilting forces exceed this threshold, the coupling releases in advance, preventing damage to the sash, screen, or sash lug itself. This beforehand cushioning approach protects the system from harmful forces.
3Ease of operation
If a breakaway coupling is implemented to allow automatic release during tilting, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The breakaway coupling is designed as a simple, inexpensive mechanical component with a predetermined failure point. Rather than using complex sensors, motors, or control systems, the invention uses a basic mechanical coupling that releases when force exceeds its design threshold. This approach achieves automatic release functionality while keeping the added complexity minimal and the component cost-effective.
Data Source
AI summary
A breakaway sash lug assembly for a hung window includes a sash mount seat attachable to a window sash and a lug body rigidly attached to the sash mount seat via a releasable coupling that is configured to release at least one side of the lug body from the sash mount seat upon application a relatively small external force on the lug body. The releasable coupling may inhibit damage from inadvertent contact between the lug body and other portions of the hung window, for example during tilting of the sash for cleaning. The releasable coupling may include a hinge and a latch and/or a snap attachment.