Childproof Lock Mechanism Segmentation for Assembly Efficiency
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Solution Overview
Problem
The existing childproof lock mechanisms in door latch apparatuses are complex and costly to manufacture, and their assembly is inefficient due to the need for a straight-line guide portion and rotating components, which restricts design freedom and assembly efficiency.
Innovation Solution
A childproof lock mechanism with a release actuating member that moves independently in conjunction with the inside lever's opening operation, using a torsion coil spring for biasing and an elongated guide hole, allowing for separate assembly and increased design freedom, and enabling assembly from the same direction as other parts in an automatic assembly line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the childproof lever is assembled movably from the back of the cover in a straight-line guide portion oriented in the front-to-rear direction, then the childproof lock mechanism can be implemented, but the structure of the cover becomes complicated and manufacturing cost increases
Solution Approach 1:
The childproof lever is divided into two separate components: the lever body and the projecting portion. The projecting portion is detachably coupled to the lever body, allowing it to be assembled separately. This segmentation eliminates the need for a complex straight-line guide portion in the cover, as the projecting portion can move independently in a release direction perpendicular to the cover's front-to-rear orientation.
Solution Approach 2:
The movement of the projecting portion is changed from the front-to-rear direction (parallel to the cover) to a release direction that is perpendicular to the cover surface. This dimensional change allows the projecting portion to move in a different orientation, eliminating the need for a complex guide structure within the cover while maintaining the childproof lock functionality.
2Reliability
If the childproof lever and projecting portion rotate integrally inside the housing, then the childproof lock mechanism functions, but the degree of freedom of arrangement and design of various parts is restricted
Solution Approach 1:
The childproof lever is segmented into the lever body and the projecting portion, which are detachably coupled. This allows the projecting portion to move independently rather than rotating integrally with the lever body. As a result, other parts within the housing can be arranged more freely without being constrained by the rotational movement of a unified lever structure.
Solution Approach 2:
The projecting portion is designed to move dynamically in a release direction rather than rotating with the lever body. This independent movement capability provides greater flexibility in the arrangement of other components within the housing, as the projecting portion's motion does not require the same spatial clearance as integral rotation.
3Reliability
If the childproof lever is assembled from the back of the cover in a straight-line guide portion, then the childproof lock mechanism can be implemented, but assembly efficiency decreases due to different assembly directions
Solution Approach 1:
The childproof lever is segmented into the lever body and the projecting portion, which are detachably coupled. This segmentation allows both components to be assembled from the same direction (the inner direction of the vehicle), eliminating the need for separate assembly operations from different directions. The projecting portion can be attached to the lever body after both are positioned, streamlining the assembly process.
Solution Approach 2:
The detachable coupling mechanism between the lever body and projecting portion serves multiple functions: it allows both components to be assembled from the same direction, facilitates easier adjustment and alignment during assembly, and enables the projecting portion to be replaced or adjusted independently if needed. This universal coupling approach improves overall assembly efficiency.
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
This design simplifies the assembly process, reduces manufacturing costs, and enhances the degree of freedom in arranging and designing other components within the housing, improving the overall assembly efficiency of the door latch apparatus.
Implementation Method 1
a biasing means always biasing the release actuating member toward the standby position
Data Source
AI summary
Provide a door latch apparatus with a childproof lock mechanism that is only a projecting portion of the childproof lock mechanism is movable in the release direction interlocked with an opening operation of an inside lever, so that the degree of freedom of arrangement and design of several kinds of parts assembled in a housing can be increased. A release actuating member is supported movably in an elongated guide hole of a childproof lever from a standby position to a release position. When the childproof lever is in a childproof unlocking position and when an inside lever is carried out the opening operation, a projecting portion contacts to the inside lever and moves in the opening direction, so that the release actuating member moves to the release position against a biasing unit.