Door Locking System with Independent Bolt and Counterbolt
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Solution Overview
Problem
Existing door locking and unlocking systems require modification of the strike plate on the door frame, limiting their installation flexibility and compatibility with various door configurations.
Innovation Solution
A locking and unlocking system comprising a movable bolt and counterbolt, both mounted on the same axis of rotation, which can deploy and retract independently, allowing for installation without modifying the strike plate, and featuring elastic means to maintain positions and facilitate opening and closing without disturbing the locking part's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a retractable strike plate is used to allow door closing, then the door can be closed again after opening, but the strike plate must be modified which increases installation complexity and reduces compatibility
Solution Approach 1:
The locking system is divided into separate functional components: a bolt assembly with locking part, a counterbolt, and a standard strike plate. The bolt and counterbolt are independently mounted on the door, allowing the strike plate to remain standard and unmodified, thus resolving the contradiction between operational capability and installation complexity
Solution Approach 2:
The counterbolt acts as an intermediary element that prevents the locking part from returning to the locking position when the bolt is deployed. This intermediary mechanism enables the door to be opened and closed without requiring the strike plate to be retractable or modified, maintaining both operational flexibility and installation simplicity
2Reliability
If the locking part prevents bolt retraction to ensure security, then locking reliability is improved, but the effort required to open the door increases
Solution Approach 1:
The counterbolt serves as a mediator that assumes the blocking function during door opening. When the door is opened, the counterbolt prevents the locking part from returning to the locking position, allowing the bolt to be retracted without requiring excessive force. This distributes the force requirement and maintains both security and ease of operation
Solution Approach 2:
The system dynamically transitions between different blocking states: during normal operation the locking part blocks bolt retraction for security, but during door opening the counterbolt takes over the blocking function. This dynamic redistribution of blocking responsibilities reduces the force needed to open the door while maintaining locking reliability
3Device complexity
If the bolt and locking part are mounted on the same axis, then the structure is simplified, but the locking part cannot prevent bolt retraction when the door is open
Solution Approach 1:
The bolt and counterbolt are mounted on the same axis of rotation, simplifying the mounting structure. The counterbolt is positioned such that when the door is open and the bolt is deployed, the counterbolt prevents the locking part from returning to the locking position. This merging of mounting axes with strategic positioning of the counterbolt resolves both the simplification and reliability requirements
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
Enables secure locking and unlocking of doors without modifying the strike plate, ensuring operation across a range of door configurations and reducing installation complexity, while minimizing the effort required to open and close the door.
Implementation Method 1
first elastic means which are able to exert on the bolt and against the bolt an elastic force tending to maintain them in the deployed position
Data Source
Figure 1~17
Figure 3a~3b
Figure 3c~3d
AI summary
The invention relates to a locking and unlocking system for a door or window (12), the system comprising a movable bolt (30) and a movable locking piece (32) adapted to cooperate with the bolt. The bolt is adapted to occupy a first deployed position in which it is held by the locking piece and a second deployed position in which it is no longer subject to the action of the locking piece. The locking piece (32) is designed to occupy a locked position in which it holds the bolt in its first deployed position in the absence of external action on said piece and to move from its locked position to an unlocked position under the action of an external force.The system includes a movable counter bolt (34) which is capable of extending and retracting when the opening and closing of the door and of preventing the locking piece from returning to its locking position when the bolt is in its second deployed position.