Double-Open End Zipper Bottom Stop for Anti-Pinch Slider Guidance
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Solution Overview
Problem
Existing anti-pinch zipper designs, including those for double-open end zippers and invisible zippers, are unsuitable for preventing the zipper slider from getting caught in the inner fabric, leading to smooth operation issues and potential jamming.
Innovation Solution
A bottom stop device comprising a stopper pin unit and a movable pin unit, integrated with the chain straps of a double-open end zipper, ensures smooth operation by preventing the zipper slider from engaging with the inner lining, allowing seamless linking and separation of the chain straps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the zipper slider moves along the chain straps, then the zipper can open and close, but the slider may be caught in the inner fabric causing it to move unsmoothly or get stuck
Solution Approach 1:
The bottom stop device is divided into two separate units: a stopper pin unit attached to one chain strap and a movable pin unit attached to the other chain strap. This segmentation allows the two pins to work independently yet cooperatively to guide the slider, preventing fabric interference while maintaining smooth operation.
Solution Approach 2:
The movable pin unit acts as an intermediary element between the slider and the inner fabric. When the slider approaches the bottom of the zipper, the movable pin engages with the slider first, guiding it away from the inner fabric before the stopper pin engages, thus preventing the slider from catching on the fabric.
2Reliability
If a bottom stop device is added to prevent slider jamming, then reliability improves, but the device complexity increases
Solution Approach 1:
By dividing the bottom stop device into two separate pin units attached to different chain straps, the complexity of each individual unit is reduced. Each pin unit has a simple structure, but together they provide reliable jamming prevention without requiring a complex single-unit design.
Solution Approach 2:
The bottom stop device serves multiple functions: it prevents slider jamming, guides the slider to the correct position, and can be applied to both anti-pinch zippers and invisible zippers. This multi-functionality justifies the added complexity by providing comprehensive protection against various operational issues.
3Object-affected harmful factors
If the inner side of the chain fabric is folded back into a chain tooth belt for anti-pinch function, then the anti-pinch capability improves, but the compatibility with standard bottom stop devices is lost
Solution Approach 1:
The movable pin unit serves as an intermediary that bridges the anti-pinch zipper structure and the bottom stop device. It engages with the slider in a way that is compatible with the folded chain fabric structure, allowing both the anti-pinch function and the bottom stop function to work together without interference.
Solution Approach 2:
The movable pin unit can change its position and engagement state dynamically. When the slider approaches, the movable pin engages to guide the slider; when the slider is in the middle of the zipper, the movable pin remains disengaged. This dynamic behavior allows compatibility with both anti-pinch and standard zipper structures.
Data Source
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AI summary
The present invention discloses a bottom stop device of double-open end zipper and assembly structure thereof. The bottom stop device can be used in double-open end anti-pinch zippers and double-open end invisible zippers. It includes a stopper pin unit (10) and a movable pin unit (20) for injection molding at the lower end of the two chain straps (31, 31'), so that the two zipper sliders (40, 40') can slide to the stopper pin unit (10). The movable pin (21) of the movable pin (21) can be inserted into the two zipper sliders (40, 40') to fit with the stopper pin unit (10), and the movable pin (21) can also be withdrawn from the two zipper sliders (40, 40') in reverse to separate the two chain straps (31, 31') from each other.