Door Latch Device with Integrated Childproof and Double Lock Lever
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Solution Overview
Problem
Existing door latch devices with childproof-double-lock mechanisms are complex and large due to the need for a significant operating space, leading to increased size and complexity.
Innovation Solution
A simplified door latch device design featuring a childproof lock mechanism and double lock lever supported by a common shaft, with an interlocking mechanism that allows the childproof lever to move through specific positions to control the childproof and double locking states, enabling compact integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a big arm is used to restrict the second subsidiary lever in the locking position, then the double locking function is achieved, but the structure becomes complicated and the device size increases
Solution Approach 1:
The patent combines the childproof lock lever and double lock lever into a single integrated component that rotates on a common axis. This merging eliminates the need for separate big arm structures and multiple independent levers, thereby simplifying the overall structure while maintaining the double locking function. The integrated lever performs both childproof locking and double locking operations through its rotational movements to different positions.
2Reliability
If a big arm is used to restrict the second subsidiary lever, then the double locking function is achieved, but the operating space required increases the casing size
Solution Approach 1:
The patent employs a nested arrangement where the childproof lock mechanism and double lock mechanism are integrated within a shared rotational space around a common axis. The levers and locking components are positioned concentrically, allowing them to occupy overlapping spatial zones. This nesting approach minimizes the overall footprint and reduces the casing size while ensuring both locking functions operate reliably.
3Adaptability or versatility
If separate childproof lock lever and double lock lever are used, then both functions are independent, but the mechanism structure becomes complex
Solution Approach 1:
The patent creates a universal lever structure that performs multiple functions. The integrated lock lever can operate in different positions to achieve both childproof locking and double locking functions. By designing the lever with multiple functional positions and appropriate engagement features, a single component replaces what would otherwise require separate specialized levers, reducing structural complexity while preserving functional versatility.
Data Source
AI summary
Provide a door latch device that allowing a childproof-double-lock mechanism is simplified and the size of the door latch device is miniaturized. While supporting a childproof lever and a double lock lever by a support shaft, coordinating the childproof lever and the double lock lever by an interlocking means and for moving the double lock lever in the direction of a double-lock position in conjunction with the childproof lever and the double lock lever move to the 3rd position from the 2nd position where is a childproof lock position.