Mortise Lock Rod Connection Anti-Pry Mechanism
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Solution Overview
Problem
Existing mortise locks and strike boxes lack a simple and cost-effective locking mechanism that effectively interrupts the force flow between the rod connection and the switching nut, leading to unwanted actuation when external force is applied.
Innovation Solution
A locking device with a locking mandrel that can move between a lower locking position and an upper release position by its own weight, integrated into the force flow chain, preventing unwanted actuation of the switching nut, and requiring active operation to deactivate the lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is integrated into the force flow chain between the rod connection and the switching nut, then the reliability of preventing unwanted actuation is improved, but the device complexity increases
Solution Approach 1:
The locking mandrel is designed to automatically move between locking and release positions using its own weight and gravity, without requiring external actuators, springs, or additional power sources. The mandrel self-locks in the lower position and self-releases when the switching nut is actuated, eliminating the need for complex control mechanisms while maintaining reliable prevention of unwanted actuation.
Solution Approach 2:
The locking function is extracted as a separate, simple component (the locking mandrel) that can be independently moved between positions. By separating the locking mechanism from the main switching mechanism and allowing independent control of the mandrel's position, the overall device complexity is reduced while maintaining effective force flow interruption when locked.
2Ease of manufacture
If the locking mandrel is moved by its own weight between positions, then the ease of manufacture is improved, but the reliability of positive locking may be worsened
Solution Approach 1:
The locking mandrel operates in a gravitational field where the lower position represents a stable equilibrium state. By designing the mandrel to naturally settle into the lower locking position under its own weight, the system utilizes gravity to maintain a reliable locked state without requiring additional locking mechanisms or energy input, achieving both manufacturing simplicity and locking 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
The solution provides a safe and reliable interruption of the force flow, ensuring the switching nut cannot be actuated by external force on the rod connection, requiring intentional activation to release the lock, thus enhancing security and simplicity.
Implementation Method 1
the locking mandrel (38) can be moved from the release position into the locking position by its own weight
Data Source
Figure 1~2
Figure 3~7
Figure 8~11
AI summary
The invention relates to a strike plate (1) or a mortise lock, comprising a lock case (3) and a lock cover (4), at least one rod connection (10, 11) mounted in the lock case (2) for connecting a rod and a switching nut (12) coupled to the rod connection (10, 11), wherein the rod connection (10, 11) is movable between a retracted and an extended position, wherein a locking device (13) is effectively provided between the rod connection (10, 11) and the switching nut (12), which prevents actuation of the switching nut (12) by external force (F) on the rod connection (10, 11) when the rod connection (10, 11) is in the extended position.The invention is characterized in that the locking device (13) has a locking pin (14, 38) that can be moved between a lower locking position and an upper release position and which can be moved from the locking position exclusively by actuating the switching nut (12).