Emergency Exit Window Locking Mechanism Prevents Accidental Opening
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Solution Overview
Problem
Existing emergency exit window systems pose a risk to young children as the safety catch may remain in the disengaged position after the window is closed, potentially allowing the window to open unintentionally.
Innovation Solution
The emergency exit window system automatically secures the locking arm in the lock position and the safety guard in the engaged position when the sash is closed, ensuring the window remains locked regardless of the safety guard's initial position, using a spring-biased locking mechanism and a pivotable safety guard to prevent accidental opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-mounted locking arm cooperates with a locking catch and a pivotally mounted safety catch is provided, then the window can be secured in the closed position, but the safety catch may remain in the disengaged position after the window is closed, creating a safety hazard
Solution Approach 1:
The safety guard is designed to automatically engage with the locking arm when the window sash is closed, without requiring manual intervention. The geometry of the safety guard and locking arm ensures that closure of the sash automatically drives the safety guard into the engaged position, making the system self-regulating and eliminating the hazard of forgotten disengagement
Solution Approach 2:
The safety guard is positioned and configured in advance to automatically engage with the locking arm before the window can be opened. The initial design arrangement ensures that the safety guard is pre-aligned to catch the locking arm protrusion, preventing any possibility of the window opening unless the safety guard is deliberately disengaged
2Ease of operation
If the safety catch is made movable to allow intentional opening, then ease of operation is improved, but the risk of unintentional opening increases
Solution Approach 1:
The safety guard is designed as a movable component that can transition between engaged and disengaged positions, but with asymmetric control characteristics. Deliberate disengagement requires active user action, while accidental forces (such as a child pushing) are insufficient to move the safety guard from the engaged position, creating dynamic safety based on force magnitude and direction
Solution Approach 2:
The interaction surfaces between the safety guard and locking arm are designed with specific geometric properties at critical locations. The engagement surface is configured to require deliberate force to disengage, while the overall mechanism maintains smooth operation for intentional opening when properly actuated
3Reliability
If a locking mechanism with safety guard is provided, then child safety is improved, but the device complexity increases
Solution Approach 1:
The safety guard function is merged with the existing locking arm mechanism rather than being implemented as a separate independent system. The safety guard utilizes the same pivotal movement and spring biasing as the locking arm, combining multiple safety functions into a unified mechanical assembly that reduces overall system complexity
Solution Approach 2:
The safety guard serves multiple functions simultaneously: it acts as a secondary locking element, a safety barrier against unintentional opening, and an automatic engagement mechanism. This multi-functionality eliminates the need for separate safety devices, reducing component count and simplifying the overall window locking system
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
This design enhances child safety by ensuring the window cannot be opened unintentionally, as the locking arm is securely locked and the safety guard is automatically engaged when the window is closed, preventing falls and enhancing emergency exit functionality.
Implementation Method 1
a spring-mounted locking arm on the window sash that cooperates with a locking catch on the window frame
Implementation Method 2
The safety catch can pivot between an engaged position in which the safety catch obstructs movement of the locking arm and a disengaged position
Data Source
AI summary
There are provided emergency exit window systems. In one form, there is provided an emergency exit window system that includes: a frame; a sash pivotally carried by the frame so as to pivot between a closed position in which the sash is flush with the frame, and an open position permitting human egress through the frame; and a locking mechanism adapted for locking the window sash in the closed position. The locking mechanism may include a locking arm movably carried by the sash, wherein the locking arm is movable relative to the sash between a lock position and an unlock position. Further, the locking mechanism may include at least one biasing member acting between the locking arm and the sash to bias the locking arm toward the lock position; an inwardly projecting locking catch fixedly carried by the frame; and an inwardly projecting safety guard movably carried by the frame.