Reverse Opening Slide Fastener Slider Positioning
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Solution Overview
Problem
Existing reverse opening type slide fasteners face difficulties in maintaining the upper and lower sliders at the bottom end of the box pin when the insert pin is removed, leading to inconvenient insertion and removal operations due to gravity-induced separation and interference with the element rows.
Innovation Solution
A reverse opening type slide fastener with a separable bottom end stop featuring a box pin, an insert pin, an upper slider, and a lower slider, along with projecting portions on the box pin to prevent free sliding and maintain the sliders at the bottom end, ensuring the rear mouths of the sliders remain in contact for easy insertion and removal of the insert pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the insert pin is removed from the slider, then the right and left fastener stringers can be separated, but the slider may slip off due to gravity and interfere with the element row
Solution Approach 1:
A projection is added to the box pin that acts as an intermediary component to prevent the slider from slipping off. The projection engages with a recess in the slider, creating a mechanical interlock that maintains slider position stability while still allowing for separation when needed.
Solution Approach 2:
The projection on the box pin is positioned in advance to engage with the slider before gravity can cause the slider to slip off. This preliminary mechanical engagement prevents the harmful effect of gravity-induced separation from occurring in the first place.
2Ease of operation
If the bottom end of the element row is lifted up to facilitate insert pin insertion, then the insert pin can be easily inserted, but the up-down relation is reversed and the slider may separate from the box pin
Solution Approach 1:
The projection on the box pin serves as a mechanical intermediary that maintains the connection between the slider and box pin even when the element row is lifted. This allows the user to elevate the bottom end for easier insertion without worrying about the slider separating due to gravity.
3Adaptability or versatility
If the slider is allowed to move freely on the box pin, then the slider can be positioned flexibly, but the slider cannot be held at the bottom end for convenient insert pin operation
Solution Approach 1:
The box pin is designed with different local properties: the main body allows free sliding for flexible positioning, while the projection at a specific location provides a stopping mechanism to hold the slider at the bottom end. This local modification enables both flexibility and operational convenience.
Solution Approach 2:
The slider transitions from a fully mobile state to a constrained state through the projection. When the slider is above the projection, it moves freely; when it reaches the projection, it is mechanically stopped and held in position, providing dynamic adaptability based on operational needs.
Data Source
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AI summary
The present invention provides a reverse opening type slide fastener in which an upper slider and a lower slider can be held at a bottom end of a box pin when an insert pin is pulled out of the upper slider and the lower slider and separated therefrom. The reverse opening type slide fastener (10) has a separable bottom end stop (22) including a box pin (40) provided consecutively from a bottom end of a right element row (13) disposed on a side edge of a right fastener stringer (17), an insert pin (30) provided consecutively from the bottom end of a left element row (12) disposed on a side edge of a left fastener stringer (16), an upper slider (50) which enables the slide fastener to be opened upward and a lower slider (60) which enables the slide fastener to be opened in a reverse direction. A stopper (46) for preventing the lower slider (60) from slipping off is provided at the bottom end of the box pin (40). A first engaging portion (44) is formed on an opposite side edge opposite to the insert pin (30) of the box pin (40) and a second engaging portion (34) is formed on an opposite side edge opposite to the box pin (40) of the insert pin (30) so as to position the insert pin (30) in a downward direction when the second engaging portion engages the first engaging portion (44). A projecting portion (48) which makes contact with the inner face of the blade of the upper slider (50) so as to suppress a free sliding of the upper slider (50) is formed on at least any one of a front side face and a rear side face opposite to the inner face of the blade of the upper slider (50) of the box pin (40).