Hatch Locking Mechanism Preventing Key Removal When Open
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Solution Overview
Problem
Existing hatch locking mechanisms, such as captive key locks, do not prevent users from leaving the hatch open after use, posing safety risks and misuse, as they allow key removal even when the hatch is open.
Innovation Solution
A locking mechanism that prevents the key from being removed unless the hatch is in a closed position, utilizing a retaining element and elastic return means activated by the hatch's opening state to ensure the lock cannot return to its locked position unless the hatch is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a captive key lock is used to prevent key loss, then the key cannot be removed accidentally, but the user cannot remove the key even when the hatch is closed, and may leave the hatch open for personal convenience
Solution Approach 1:
The locking mechanism dynamically changes its state based on the hatch position. When the hatch is open, the retaining element is positioned to block the lock's return to locked position, preventing key removal. When the hatch is closed, the retaining element moves to allow the lock to return to locked position, enabling key removal. This dynamic behavior resolves the contradiction by making the key removability dependent on the hatch state rather than being fixed.
Solution Approach 2:
The mechanism incorporates feedback from the hatch position to control key removability. The retaining element is actuated by the hatch movement, creating a feedback loop where the hatch position automatically controls whether the lock can return to its locked position. This feedback mechanism ensures that key removal is only possible when the hatch is properly closed, eliminating the need for manual intervention while maintaining security.
2Ease of operation
If the hatch can be opened and key removed for user convenience, then users can access the container, but the hatch may be left open creating safety hazards and misuse
Solution Approach 1:
The mechanism applies preliminary anti-action by preventing the key from being removed unless the hatch is in the closed position. The retaining element is positioned to block the lock's return to locked position when the hatch is open, making it impossible to remove the key and thus impossible to leave the hatch open. This preliminary prevention eliminates the possibility of the harmful effect before it can occur.
Solution Approach 2:
The mechanism converts the potential harm of an open hatch into a beneficial security feature. By designing the locking mechanism so that key removal is mechanically linked to the closed hatch position, the system transforms what could be a safety hazard (open hatch) into a guaranteed safe state (hatch must be closed to remove key). The potential failure mode becomes the enforcement mechanism for safety.
3Ease of manufacture
If a simple locking mechanism is used, then the device is economical and easy to manufacture, but it cannot prevent the hatch from being left open
Solution Approach 1:
The mechanism employs a nested structure where the retaining element is integrated within the existing lock assembly. The retaining element works in conjunction with the lock's existing components (bolt, key cylinder) rather than requiring a completely separate system. This nesting approach adds the safety function while minimizing additional parts and complexity, maintaining ease of manufacture while achieving the reliability goal.
Solution Approach 2:
The locking mechanism is self-regulating and does not require external control systems, motors, or complex electronics. The hatch position itself actuates the retaining element through direct mechanical connection, making the system self-service. The mechanism automatically ensures that key removal is only possible when the hatch is closed, without requiring additional sensors, actuators, or control logic, thus maintaining simplicity while achieving reliability.
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
Ensures the hatch remains closed, preventing key removal until it is securely closed, thereby avoiding safety hazards and misuse, while being simple, economical, and suitable for various types of hatches and containers.
Implementation Method 1
elastic return means, capable of pushing the retainer towards its blocking position
Data Source
AI summary
The invention relates to a locking mechanism (14) for a hatch (12) in a closed position, a position in which said hatch closes an opening, the locking mechanism comprising: - a key lock (14a) capable of taking two distinct positions, a locked position, in which a bolt (16) opposes the opening of the hatch, and an unlocked position, in which the bolt (16) allows the opening of the hatch, the lock (14) being such that it only allows the removal of the key in the locked position; - retaining means (18, 19) capable of preventing the lock (14a) from returning to the locked position, activation means (30, 32) for the retaining means (18, 19), capable of activating the retaining means when the hatch is opened and deactivating the retaining means when the hatch is in the closed position.The invention also relates to a voluntary drop-off container for waste collection, the hatch of which can be locked by means of such a mechanism.