Pivoting Double-Leaf Security Lock for Wide Passage
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Solution Overview
Problem
Existing security locks with single-person entry doors are inadequate for emergency evacuations and passage of large objects due to limited width and complex, costly structures.
Innovation Solution
A security lock with a double-leaf door system, where a passage leaf and a release leaf are pivotally mounted in a fixed frame, allowing both leaves to pivot over 180°, enabling wider openings for emergency evacuations and passage of large objects, while maintaining access control through a single passage leaf.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single passage leaf is used in a fixed frame, then the structure is simple and cost is reduced, but the passage width is limited and cannot accommodate large objects or emergency evacuation
Solution Approach 1:
The door system is segmented into two independent leaves (passage leaf and release leaf), each capable of pivoting separately. This segmentation allows the system to achieve a wider total opening (both leaves open) while maintaining a simple fixed frame structure, resolving the contradiction between structural simplicity and passage width adaptability.
Solution Approach 2:
The door leaves are designed with dynamic pivoting capability around vertical axes, allowing them to rotate between closed and fully open positions. This dynamic configuration enables the passage width to be adjusted from narrow (single leaf open) to wide (both leaves open) without changing the fixed frame structure, thereby achieving adaptability while maintaining structural simplicity.
2Adaptability or versatility
If a movable fixed frame with pivoting mechanism is added to increase passage width, then the passage can accommodate large objects, but the structure becomes more complex and cost increases
Solution Approach 1:
Instead of making the entire frame movable, only the door leaves are segmented and made pivotable while the frame remains fixed. This selective segmentation achieves the desired passage width increase without the complexity of a fully movable frame structure.
Solution Approach 2:
Rather than making the frame movable to increase passage width (conventional approach), the invention inverts the approach by keeping the frame fixed and making the leaves pivotable. This inversion achieves the same functional goal of increased passage width while maintaining structural simplicity and reducing costs.
3Reliability
If two consecutive passage leaves are used to cross the airlock, then access control is maintained, but the device complexity and manufacturing cost increase
Solution Approach 1:
The passage leaf and release leaf are merged into a coordinated dual-leaf system where both leaves serve access control functions. The passage leaf controls entry to the airlock while the release leaf controls entry to the protected space, combining multiple access control functions into a unified door system rather than requiring separate independent mechanisms.
Solution Approach 2:
Both door leaves are designed with multi-functionality: they provide access control, can be opened independently or together, and enable both normal operation and emergency evacuation modes. This universal design achieves reliable access control while avoiding the need for additional specialized components that would increase complexity.
4Device complexity
If the door leaves are constrained to limited pivoting range, then the structure is simpler, but the ability to evacuate people or pass large objects is compromised
Solution Approach 1:
The door leaves are designed with dynamic pivoting capability around vertical axes, allowing them to rotate through large angles (from closed to fully open positions). This dynamic range motion enables both normal access control operation and emergency evacuation scenarios while maintaining relatively simple pivot hinge mechanisms without complex constraints.
Data Source
Figure 1a~1b
Figure 1c~1d
AI summary
The chamber has a single member entry door (2) comprising a passage leaf (4) and a releasing leaf (5) mounted on respective vertical posts of fixed casing frames (6) by round pivot connections (9), where the passage leaf cooperates with an individualization cabin (3). The connection authorizes pivoting of the leafs to open the leafs at the interior of a protected space (1) for permitting passage of large objects or at the exterior of the protected space in case of lack of place at the interior or for assisting emergency evacuation of persons in the space.