Sliding Sash Secondary Lock Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sliding sash fenestration assemblies lack a reliable secondary lock mechanism that securely locks the sliding sash in positions other than fully closed or fully open, compromising security and ventilation control.
Innovation Solution
A secondary lock mechanism featuring a handle-operated pin system, where a pin is biased by a spring to align with and engage an aperture in the header, providing resistance and locking the sliding sash between closed and open positions, while allowing controlled air entry without allowing human passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sliding sash is designed with only a primary lock that secures it in fully closed position, then the locking mechanism is simple, but security and ventilation control in intermediate positions are compromised
Solution Approach 1:
The locking mechanism is segmented into two distinct components: a primary lock for fully closed position and a secondary lock for intermediate positions. The secondary lock includes separate elements (pin, handle, biasing member) that work together to provide locking at specific intervals, allowing the sash to be secured at multiple positions without requiring a complex continuous locking system
Solution Approach 2:
The pin acts as an intermediary element between the handle and the header aperture. When the handle is actuated, the pin extends to engage with the aperture in the header, providing the locking function. The biasing member serves as an intermediary force mechanism that automatically returns the pin to its retracted position when the handle is released, enabling automatic disengagement
2Reliability
If a secondary lock mechanism is added to provide intermediate position locking, then security and ventilation control are improved, but the device complexity increases
Solution Approach 1:
The secondary lock mechanism merges multiple functions into a compact assembly: the handle provides manual actuation, the pin provides the locking protrusion, and the biasing member provides automatic return force. These components are integrated into a single mechanism that adds intermediate position locking capability without requiring separate systems for each function
Solution Approach 2:
The biasing member enables the pin to automatically return to its retracted position when the handle is released, providing self-service functionality. The mechanism uses the elastic force of the biasing member to automatically reset the locking pin without requiring manual intervention or additional power sources, simplifying the operation of the secondary lock
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The secondary lock mechanism effectively secures the sliding sash in intermediate positions, enhancing security and ventilation control by allowing air entry while preventing unauthorized access.
Implementation Method 1
A pin is biased toward the first longitudinal member by a biasing member. The pin being biased into the aperture by the biasing member when the pin is aligned with the aperture.
Data Source
AI summary
A sliding fenestration sash assembly includes a sliding sash and a frame having a first longitudinal member including at least one aperture. A pin is operatively connected to a handle and movable between an extended position and a retracted position. The pin is biased toward the first longitudinal member by a biasing member. The pin being biased into the aperture by the biasing member when the pin is aligned with the aperture.