Slide Fastener Opening Assembly That Prevents Slider Twisting
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Solution Overview
Problem
Existing slide fasteners, particularly those with a waterstop film, require significant force to close and are prone to twisting, leading to improper engagement of fastener elements when the slider is pulled up, especially in knitted fasteners where the slider easily twists towards the box pin side.
Innovation Solution
A slide fastener design featuring a box pin and separable pin configuration with a forward-protruding box pin, a separable pin insertion hole, and an inclined surface on the box body, along with a slider that is inclined at a specific angle, ensuring the meshing head portions of the fastener elements remain engaged during the pulling motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterstop film is attached to a knitted fastener to improve waterproofing, then waterproofing performance is improved, but the slider becomes prone to twisting when pulled up, causing improper engagement of fastener elements
Solution Approach 1:
The patent applies preliminary anti-action by designing the box body with an inclined surface that proactively counteracts the twisting tendency of the slider before the twisting can cause improper engagement of fastener elements. The inclined surface creates a guiding force that prevents the slider from rotating during the pull-up operation, thereby maintaining proper alignment of the fastener elements throughout the operation.
2Productivity
If force is applied to pull up the slider when closing the slide fastener, then the fastener can be closed, but the slider twists toward the box pin side, causing collision and improper engagement of fastener elements
Solution Approach 1:
The inclined surface of the box body acts as an intermediary between the pulling force applied to the slider and the fastener elements. It transforms the vertical pulling motion into a controlled movement that maintains proper alignment, mediating the interaction between the slider and fastener elements to prevent collision and ensure reliable engagement.
3Adaptability or versatility
If the slider is pulled up from a state with separable pin inserted, then the fastener can be opened, but the slider twists and the backmost elements collide, preventing smooth operation
Solution Approach 1:
The inclined surface provides preliminary anti-action by preventing slider twisting at the moment of opening operation. By creating a guiding force that counteracts the rotational tendency, it ensures smooth pull-up motion and proper engagement of the backmost elements throughout the opening process.
Data Source
AI summary
In a slide fastener, at a slider pull-up start position in which an insert pin is inserted into an insert pin insertion hole of a box body and a slider is in contact with the front surface of the box body, an engaging head portion of the rearmost element of one fastener element row approaches or comes into contact with an engaging portion provided on the insert pin.