Three Point Lock for Fenestration Sash Security
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Solution Overview
Problem
Conventional fenestration assemblies lack a secure and efficient locking mechanism that allows for easy transition between fully closed and partially open positions while maintaining security and preventing unauthorized access.
Innovation Solution
A three-point lock system comprising a main lock and two side locks, operated by a handle that moves between positions to unlock and lock the sash, ensuring secure engagement at three distinct locations, allowing for partial opening while maintaining the main lock in an unlocked state to prevent full opening without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking mechanism is used, then the structure is simple, but the security and control over opening positions are insufficient
Solution Approach 1:
The locking mechanism is divided into three separate locking points (top, bottom, and side locks) that can be independently engaged or disengaged. This segmentation allows the system to provide enhanced security through multiple locking positions while maintaining a relatively simple overall structure where each individual lock remains straightforward in design.
2Adaptability or versatility
If a single lock mechanism is used, then the device complexity is low, but the ability to control partial opening and ventilation is limited
Solution Approach 1:
The locking system incorporates a movable sash with a handle that can be positioned at different locations (top, bottom, or side of the sash). This dynamic positioning capability allows the user to engage different locking points based on the desired opening position, enabling controlled ventilation while maintaining security. The handle's mobility provides versatility without requiring multiple separate locking devices.
3Ease of operation
If the handle moves to unlock all locks simultaneously, then the operation is simple, but the risk of accidental full opening increases
Solution Approach 1:
The locking mechanism is designed so that the handle's position determines which specific locking point is engaged or disengaged. When the handle is at the side position, only the side lock is affected, allowing top and bottom locks to remain engaged independently. This localized control quality enables simple operation while preventing accidental full opening, as each lock can be secured or released independently based on handle position.
Data Source
AI summary
A fenestration assembly includes a frame assembly, a movable sash assembly and a lock assembly. The lock assembly includes a first lock and a second side lock. The first lock operatively locks and unlocks the moveable sash to the frame assembly in a first direction only when the movable sash is in a fully closed position. The first side lock operatively locks and unlocks the movable sash in a second direction perpendicular to the first direction both when the movable sash is in the fully closed position and a partially open position.