Catch Mechanism with Sequential Connectors Against Forced Bolt Retraction
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Solution Overview
Problem
Existing locking devices can be manipulated by unauthorized individuals using violence or tools, compromising security and allowing unauthorized access.
Innovation Solution
A catch mechanism with a follower and catch that is operated by a control member, featuring connectors with play to prevent unauthorized manipulation, and allowing both mechanical and electromechanical operation, with the catch mechanism housed within an inner compartment to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catch is provided to prevent bolt retraction, then security against unauthorized opening is improved, but the locking device can still be manipulated by forcing the catch or using tools through the bolt opening
Solution Approach 1:
The control member is divided into two distinct connectors: a first connector that operates the catch, and a second connector that operates the follower. The play in the second connector creates a sequential operation where the catch must be moved first, then the follower can operate the bolt. This segmentation prevents direct manipulation of the bolt without first properly operating the catch through the controlled first connector path.
Solution Approach 2:
The control member acts as an intermediary between the user and both the catch and follower. By requiring the control member to traverse a specific path with defined connectors and play, it mediates the operation sequence, ensuring that external forces cannot directly manipulate the bolt without going through the controlled mechanical pathway designed for authorized operation.
2Ease of operation
If the catch and control member are made accessible for operation, then ease of operation is improved, but vulnerability to outside manipulation increases
Solution Approach 1:
The control member and catch are nested within the locking device housing, with the control member positioned such that it can be operated by authorized means (key or keycard) while the catch remains protected within the structure. The first connector engages the catch in a protected manner, allowing operation without direct external access to the catch itself.
Solution Approach 2:
The control member operates along a defined path that changes the dimensional approach to operating the mechanism. Rather than direct linear access to the catch, the control member must follow a specific trajectory with connectors positioned at different locations, adding a dimensional constraint that prevents simple external manipulation while allowing authorized operation.
3Adaptability or versatility
If the second connector has play to enable sequential operation, then the ability to operate catch and follower separately is improved, but the complexity of the mechanism increases
Solution Approach 1:
The second connector incorporates play that allows dynamic adjustment during operation. The play enables the control member to first engage and move the catch through the first connector, then continue along its path to engage the follower through the second connector. This dynamic clearance allows the mechanism to adapt to the sequential operation requirement without requiring complex separate actuation systems for each component.
Data Source
AI summary
The present invention relates to a catch mechanism for blocking a bolt to prevent unauthorized opening of a door, the catch mechanism comprising a follower for operating a bolt between a locked state in which the bolt is extended and an unlocked state in which the bolt is retracted; a catch configured to block the follower for preventing movement of the bolt in the locked state, and a control member for operating the follower and the catch,The invention also relates to a locking device comprising such a catch mechanism.