Security Window Locking Mechanism for Tilted Position
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Solution Overview
Problem
Current security windows and doors with burglar-resistant designs lack adequate security in the tilted position, as locking elements disengage and fail to prevent horizontal or vertical movements, leading to insufficient protection against forced attacks.
Innovation Solution
A security window or door design where the first locking element coupled to the push rod engages with a chamber in the sash profile, creating a durable form-fitting connection, and an additional swivel joint is formed between the sash and frame, allowing for secure tilting and rotation while preventing relative movement perpendicular to the tilt axis, with locking elements remaining engaged in both tilted and closed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard turn-tilt hinges or bearing sockets are used to connect the sash frame with the frame, then the window can be easily tilted for ventilation, but the connection cannot withstand violent or sustained attacks in the tilted state
Solution Approach 1:
The locking mechanism is segmented into multiple locking elements distributed at different locations on the sash frame, with each locking element independently engaging with the frame. This segmentation allows the system to maintain security while enabling tilting operation, as the locking elements can be designed to disengage in a controlled manner during tilting while remaining engaged during normal operation.
Solution Approach 2:
The locking elements are designed to dynamically change their engagement state based on the window's position. In the closed position, multiple locking elements engage simultaneously to provide maximum security. During tilting, the mechanism allows controlled disengagement of specific locking elements while maintaining engagement of others, creating a dynamic security system that adapts to operational requirements.
2Reliability
If locking elements are arranged to provide high security in the closed state with strong form fit engagement, then burglar resistance is improved, but the locking elements become ineffective in the tilted state due to disengagement
Solution Approach 1:
Different locking elements are designed with different engagement characteristics suitable for their specific locations and functions. Locking elements positioned to prevent horizontal movement have different geometric features than those preventing vertical movement. This local differentiation allows each locking element to be optimized for its specific security function while collectively providing comprehensive protection in both closed and tilted states.
Solution Approach 2:
The locking system transitions from a static engagement design to a dynamic one where locking elements can selectively engage and disengage based on window position. The mechanism includes cam surfaces or inclined planes that allow locking elements to automatically adjust their engagement state, maintaining security in the tilted position while enabling easy operation in the closed position.
3Reliability
If multiple locking elements are arranged with short distances to each other on all four sash legs, then security in the closed state is enhanced, but the complexity of the locking mechanism increases
Solution Approach 1:
Multiple locking elements are merged into a single integrated locking mechanism that operates through one control interface. The push rod connects all locking elements, allowing them to be engaged or disengaged simultaneously through a single user action. This merging reduces operational complexity while maintaining the security benefits of multiple engagement points.
Solution Approach 2:
The locking mechanism is designed with multi-functionality where the same locking elements serve multiple purposes: providing security in the closed state, enabling controlled tilting operation, and maintaining security during the tilted state. This universal design reduces the need for separate mechanisms for different functions, thereby reducing overall system complexity.
Data Source
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AI summary
The window/door has a frame anchoring in an opening of a building, and receiving a casement (4) that is tiltable about a horizontal tilt axis (20) and rotatable about a vertical rotational axis. The casement has a pushrod disposed in a mortise area. The pushrod is movable between a tilt position in which the casement is tiltable and a rotation position in which the casement is rotatable. A locking element (30) firmly coupled to the frame is disengageable from another locking element (33) in the rotation position of the pushrod to allow a rotation of the casement about the rotational axis.