Waterproof Door Latch Cover With Movable Sealing Body
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Solution Overview
Problem
The existing waterproof structures for door latch devices are complex and require multiple components for sealing, increasing the number of parts and complicating the assembly process, as they need sealing members between the frame and case, and between the frame and lid parts.
Innovation Solution
A waterproof structure for a door latch device featuring a cover with a box-shaped cover main body and a cover supporting body that is attached to the case, allowing the cover main body to move between closed and open positions, with a sealing member only required between the cover main body and the case, housing the input lever and cable end parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cover member with frame part, bottom part, and lid part is used to waterproof the input lever and cable, then water prevention is improved, but the number of components increases and assembly work becomes complicated
Solution Approach 1:
The patent merges the bottom part and frame part into a single integrated cover member that is directly attached to the case. This eliminates the need for separate sealing members between the frame and case, reducing the total component count while maintaining waterproof effectiveness through the integrated structure.
Solution Approach 2:
The cover member is designed to simultaneously serve multiple functions: it provides waterproof sealing between the lid and frame, houses the input lever and cable end, and attaches directly to the case without requiring additional frame components. This multi-functionality reduces the overall component count.
2Object-affected harmful factors
If a cover member with multiple parts and sealing members is used, then water prevention is improved, but assembly work becomes complicated
Solution Approach 1:
By integrating the bottom part and frame part into a single cover member structure that attaches directly to the case, the patent reduces the number of assembly steps. The direct attachment eliminates the need to separately assemble frame-to-case seals, simplifying the manufacturing process while maintaining waterproof integrity.
3Ease of operation
If the lid part is made movable to facilitate cable connection work, then ease of operation is improved, but the structure becomes more complex
Solution Approach 1:
The lid part is designed to be movable relative to the frame part, allowing the lid to be opened for cable connection work and then closed for waterproof operation. This dynamic design enables easy maintenance and assembly while the closed state provides effective water prevention.
Data Source
AI summary
A waterproof structure of a door latch device, in which one end part of a cable is connected to an input lever including one end part projecting toward outside of a case, includes a cover including: a cover main body having a box shape with a cover opening, the cover main body being configured to house the one end part of the input lever and the one end part of the cable via the cover opening when the cover main body abuts on the case; and a cover supporting body extending from the cover main body. The cover is attached to the case via the cover supporting body in a state in which the cover main body is movable between a closed position at which the cover main body abuts on the case and an opened position at which the cover main body is separated from the case.