Door Lock Deadbolt Latchbolt Actuation Mechanism
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Solution Overview
Problem
Existing door lock mechanisms that move dormant bolts first and then the turning bolt are complex, often requiring specific forms of racks and pins, or multiple key turns in the cylinder.
Innovation Solution
A simplified door lock mechanism where the movement of dormant bolts and the turning bolt are activated by a single actuator, such as the lock cylinder, reducing complexity and allowing for easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanisms like pinion and racks with specific shapes are used to move deadbolts first and then latch bolt, then the sequential movement is achieved, but the device complexity increases
Solution Approach 1:
The rod is divided into two distinct functional segments: a first portion that interacts with the deadbolts and a second portion that interacts with the latch bolt. This segmentation allows each portion to be optimized for its specific function while simplifying the overall mechanism, eliminating the need for complex pinion and rack systems.
Solution Approach 2:
The mechanism uses dynamic positioning of a cam follower that can transition between engaging the first portion (for deadbolt movement) and the second portion (for latch bolt movement). This dynamic engagement allows a single actuator to control sequential movement through different phases of the same mechanical component, reducing device complexity.
2Reliability
If additional rods and multiple key turns are used to move deadbolts and latch bolt, then the sequential actuation is achieved, but the ease of operation deteriorates
Solution Approach 1:
The single rod is segmented into two functional portions with distinct roles. The first portion controls deadbolt retraction while the second portion controls latch bolt retraction. This segmentation within a single component eliminates the need for multiple separate rods and multiple key turns, improving ease of operation while maintaining reliable sequential actuation.
3Force
If the latch bolt is kept in extended position during deadbolt movement, then the deadbolt remains centered and friction is reduced, but the mechanism complexity increases
Solution Approach 1:
The cam follower dynamically transitions between engaging the first portion of the rod (keeping latch bolt extended during deadbolt movement) and the second portion (retracting latch bolt after deadbolts are retracted). This dynamic engagement sequence achieves friction reduction during deadbolt movement while using the same simple rod structure, avoiding additional complexity.
Data Source
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Figure 3
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AI summary
This lock comprises: - a sliding link between a rod and a deadbolt capable of allowing the rod to continue its movement from an unlocked position to a free position, - an actuator (46) capable, after moving the rod from a locked position to its unlocked position, of causing the rod to move to its free position, and - a mechanical link (160) between the rod and a latch bolt (36) capable of: - moving the latch bolt from an extended position to a retracted position when the rod is moved by the actuator from its unlocked position to its free position, and - in the unlocked position of the rod, allowing the latch bolt to move to its retracted position by form cooperation with a post fixed to a door frame.