Door Lock Link Lever Anti-Panic Mechanism Design
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Solution Overview
Problem
Conventional door lock systems with anti-panic mechanisms are complex, increasing assembly time and manufacturing costs due to the large number of components, particularly the anti-panic lever, sector gear, and spring, which interfere with door-opening and unlocking operations.
Innovation Solution
A simplified door lock system design using a latch, ratchet, ratchet lever, first and second link levers, and a spring, where the second link lever has a cylindrical bushing and a ratchet driver that allows disengagement of the ratchet from the latch during door-opening while maintaining the link lever's position through the spring's resilient force, reducing the number of components and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-panic mechanism is added to prevent panic states, then door-opening and unlocking operations are protected from interference, but the number of components increases and the structure becomes complicated
Solution Approach 1:
The patent combines the anti-panic function with the existing link lever mechanism. The link lever serves dual purposes: it transmits the door-opening operation to disengage the ratchet from the latch, and simultaneously prevents panic states by blocking the ratchet lever when the door is locked. This merging eliminates the need for a separate anti-panic lever, reducing component count while maintaining the anti-panic function.
Solution Approach 2:
The link lever is designed to perform multiple functions: it acts as both a transmission lever for door-opening operations and an anti-panic mechanism. When the door is locked, the link lever positioned in the unlocked state blocks the ratchet lever from disengaging the ratchet, thereby preventing panic states. This multi-functionality reduces the overall number of components needed in the door lock system.
2Reliability
If multiple components are used to achieve anti-panic mechanism, then door-opening and unlocking operations are protected, but assembly time and manufacturing cost increase
Solution Approach 1:
The patent merges the anti-panic function into the existing link lever, eliminating the need for separate anti-panic components such as an anti-panic lever, sector gear, and additional springs. This reduction in component count directly decreases assembly time and manufacturing cost while maintaining the anti-panic function.
Solution Approach 2:
The link lever is designed to perform multiple functions including door-opening transmission and anti-panic protection. This multi-functionality reduces the total number of parts that need to be manufactured and assembled, thereby improving productivity and reducing manufacturing costs while ensuring reliable anti-panic operation.
3Ease of operation
If a spring is used to maintain link lever position, then smooth operation is achieved, but the number of components increases
Solution Approach 1:
The patent uses a single spring to perform multiple functions: it biases the link lever to maintain proper positioning for smooth operation, and also contributes to the anti-panic mechanism by helping to hold the link lever in the unlocked state when the door is locked. This single spring replaces what would otherwise require multiple springs and additional components in conventional designs.
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 simplified design reduces the number of components, lowers assembly and manufacturing costs, and ensures smooth door-opening and unlocking operations without the interference issues present in conventional systems.
Implementation Method 1
The spring is interposed between the first link lever and the second link lever, and maintains the second link lever in the first rotational position with respect to the first link lever by a resilient force of the spring when the first link lever moves from the second position to the first position.
Data Source
AI summary
A door lock system includes a first link lever, a second link lever, and a spring. The first link lever moves to a transmitting position in response to an unlocking operation. The second link lever includes a ratchet driver that is formed integrally with a bushing. The ratchet driver is rotatable between a first rotational position and a second rotational position on the first link lever. In response to a door-opening operation, when the ratchet driver is in the first rotational position and the first link lever is in the transmitting position, the second link lever allows a ratchet lever to disengage a ratchet from a latch. The spring maintains the second link lever in the first rotational position when the first link lever moves to the transmitting position.