Asymmetric Door Wing Profiles for Break-in Prevention
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Solution Overview
Problem
Metal safety doors and windows with latch type closing devices face complexity in construction and vulnerability to break-ins due to non-complementary profiles and large gaps between wings, which can be exploited for unauthorized opening or smashing.
Innovation Solution
A window or door design featuring two wings with a latch-type locking device, where a sliding bolt engages a concave profile on one wing to prevent movement and rotation, and a pusher mechanism ensures secure alignment, reducing the need for additional fastening points and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional latch type closing devices are used with flat profiles on both wings, then the construction is simplified, but the play between faces is considerable facilitating lifting off the hinges and break-in attempts
Solution Approach 1:
The patent applies asymmetry by giving one wing a convex profile and the other wing a concave profile. This asymmetric design eliminates the excessive play between flat faces while maintaining construction simplicity. The convex-concave interface provides tight closure without requiring additional fastening points, thereby preventing tool insertion and hinge lifting attempts.
2Area of stationary object
If more than two wings are present with flat profiles, then the window or door covers larger area, but the play is accumulated worsening the security problem
Solution Approach 1:
The asymmetric convex-concave profile design is applied to each wing interface. When multiple wings are present, each junction between adjacent wings uses the convex-concave configuration, preventing play accumulation at each interface. This ensures that even with multiple wings covering larger areas, the security against break-ins is maintained by eliminating gaps where tools could be inserted.
3Reliability
If complementary profiles are used on both wings, then security against break-ins is improved, but different tubular sections are required increasing device complexity
Solution Approach 1:
The patent applies local quality by implementing the convex profile on one wing and the concave profile on the other wing at the closing interface. This localized differentiation provides the necessary security features exactly where needed (at the closing edge), while the rest of the wing structure can use standard uniform tubular sections, thereby limiting the increase in overall device complexity.
4Reliability
If strips are applied to cover the gap between wings, then security is improved, but the construction complexity and number of components increase
Solution Approach 1:
The patent merges the gap coverage function directly into the wing profiles themselves. Instead of adding separate strips as additional components, the convex and concave profiles are integrated into the wing structures, creating the gap-covering effect as an inherent feature of the wings. This eliminates the need for separate strips and reduces the total number of components while maintaining security.
Data Source
Figure 1~4
Figure 5a~5c
Figure 6a~6c
AI summary
Window or door including: at least a first and second wing (1, 2, 1', 2') each hinged along one of its axes of rotation (3, 4, 3', 43) and such as to permit reciprocal alignment in a plane; said first wing (1, 1') comprising a latch type locking device having a bolt (12, 12', 13) fixed so as to slide along one edge (10) of said first wing, outside this, and designed to engage one end (31 ) in a fixed structure (5, 6, 7) to prevent movement of the first wing in relation to said fixed structure, said bolt being able to engage a corresponding profile of one edge (11) of the second wing (2, 2') when the wings are aligned so as to prevent reciprocal translation of the wings in a direction perpendicular to the plane of alignment.