Waterproof Slider Extended Contact Surface
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Solution Overview
Problem
Existing waterproof slide fasteners fail to maintain a waterproof effect when the slider is positioned slightly rearward from the closing limit position due to gaps formed between the inclined surfaces of the upper and lower blades and the stop.
Innovation Solution
The slider is configured with upper and lower blades that include close-contact surfaces and extended close-contact surfaces, along with protrusions, which are inclined to widen and then narrow the gap between the blades, ensuring continuous contact with the stop even when the slider is slightly rearward, enhancing the waterproof effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the slider is configured with only inclined surfaces on the upper and lower blades, then the elements can be guided smoothly, but gaps are formed between the inclined surfaces and the stop when the slider is positioned slightly rearward from the closing limit position, resulting in loss of waterproof effect
Solution Approach 1:
The invention extends the close-contact surfaces forward from the original position around the connecting post, creating an additional dimensional extension in the front-rear direction. This extended close-contact surface maintains contact with the stop even when the slider is positioned slightly rearward, while the inclined surfaces continue to provide element guiding functionality.
Solution Approach 2:
The extended close-contact surface is positioned forward of the connecting post to make preliminary contact with the stop before the main body of the slider reaches the limit position. This preliminary action ensures continuous contact and waterproof effect even when the slider is slightly rearward from the closing limit position.
2Reliability
If the upper blade and lower blade extend further forward to sandwich the stop, then waterproof effect is achieved at the closing limit position, but the structure becomes more complex and the gap between blades increases
Solution Approach 1:
The blade structure is segmented into distinct functional zones: inclined surfaces for element guiding, close-contact surfaces for waterproof contact with the stop, and extended close-contact surfaces for maintaining contact when rearward positioned. This segmentation allows each portion to perform its specific function without requiring the entire blade structure to be extended.
Solution Approach 2:
Different portions of the blade opposing surfaces are given different local qualities: the inclined surfaces provide guiding geometry, while the close-contact and extended close-contact surfaces provide flat, continuous contact areas for waterproof sealing with the stop.
Data Source
AI summary
A slider for a waterproof slide fastener includes an upper blade and a lower blade opposing each other in an up-down direction, and a connecting post connecting the upper blade with the lower blade. Each of opposing surfaces includes a close-contact surface for sandwiching and close-contacting with a first stop in the up-down direction. At least one of the opposing surfaces includes right and left inclined surfaces provided respectively on right and left sides at a front sides of the close-contact surface and inclined in a direction widening a gap between the upper blade and the lower blade as the right and left inclined surfaces go forward. The at least one of the opposing surfaces includes an extended close-contact surface provided between the right and left inclined surfaces and extending forward from the close-contact surface.