Fenestration Screen Carrier for Sliding-Pivot Operation
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Solution Overview
Problem
There is a need for improved sliding and pivot fenestration units and components that enhance the functionality and versatility of sliding doors and windows, particularly in terms of their operation modes and locking mechanisms.
Innovation Solution
The fenestration units incorporate a locking pivot wheel assembly that facilitates both slide and pivot modes of operation, with a lock mechanism that inhibits sliding motion during pivot mode and allows sliding motion during pivot mode transitions, and include features like height adjusters, stop members, and screen carriers to enhance operational flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to the pivot wheel assembly to inhibit sliding motion during pivot mode, then the reliability of mode operation is improved, but the device complexity increases
Solution Approach 1:
The lock mechanism is integrated into the pivot wheel assembly, combining the locking function with the existing pivot mechanism. The lock pins and actuators are incorporated within the pivot wheel structure, merging multiple functions into a single integrated assembly rather than adding separate locking components.
Solution Approach 2:
The lock mechanism operates automatically through the pivot wheel's own rotation. As the pivot wheel rotates between slide and pivot modes, the cam surfaces and lock pins automatically engage or disengage without requiring external actuation, making the system self-regulating based on its operational state.
2Reliability
If a lock mechanism with multiple lock pins and actuators is implemented, then the reliability of preventing sliding during pivot mode is improved, but the device complexity increases
Solution Approach 1:
The locking function is divided into multiple lock pins that can be independently actuated. Each lock pin can engage with corresponding features on the rider assembly, providing redundant locking points that enhance reliability while distributing the locking function across multiple simple components rather than one complex mechanism.
Solution Approach 2:
The actuators serve dual purposes: they actuate the lock pins for locking functionality, and their rotation also drives the pivot wheel's operational mode changes. This multi-functionality reduces the need for separate actuation mechanisms, offsetting the added complexity of multiple lock pins.
3Adaptability or versatility
If the fenestration system includes both slide and pivot mode capabilities with a locking mechanism, then the adaptability and versatility are improved, but the device complexity increases
Solution Approach 1:
The system dynamically transitions between slide and pivot modes through the rotation of the pivot wheel. The locking mechanism adapts its state automatically based on the pivot wheel's angular position, engaging for pivot mode and disengaging for slide mode, providing dynamic adaptability without requiring complex control systems.
Solution Approach 2:
The pivot wheel acts as an intermediary component that mediates between the slide and pivot operational modes. It translates rotational input into the appropriate mode transition and simultaneously controls the locking mechanism's engagement state, simplifying the overall system architecture by using a single mediating component for both functions.
Data Source
AI summary
A sliding and pivoting fenestration unit, such as a sliding door, with screen. Embodiments of the fenestration unit include a locking and height-adjustable pivot rider, a head slide, a screen carrier, and a method of operation.