Slider Pull Tab Spring Integration for Miniaturization
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Solution Overview
Problem
The existing slider for slide fasteners has a complex structure, is heavy due to its large size, difficult to miniaturize, and lacks automatic assembly capabilities, leading to potential operational issues and challenges in mass production.
Innovation Solution
A simplified slider design incorporating a spring portion to maintain the pull tab in a lay-down state using elastic force, with regulating portions to prevent excessive pivoting, allowing for automatic assembly and reduced size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hinge spring is used to maintain the pull tab in a lay-down state, then the pull tab can be kept in position, but the structure becomes complicated and the slider size and weight increase
Solution Approach 1:
The patent extracts the spring component from the slider body and relocates it to the pull tab itself. The spring is now part of the pull tab assembly rather than a separate component housed in the slider, simplifying the overall structure while maintaining the lay-down position functionality
Solution Approach 2:
The patent combines the spring, cam surface, and pull tab into a single integrated assembly. The spring is positioned on the pull tab shaft, and the cam surface is formed on the pull tab body, merging multiple previously separate components into one unified structure that reduces complexity
2Reliability
If a hinge spring is disposed in the slider to maintain the pull tab, then the pull tab can be kept in lay-down state, but the slider size increases and miniaturization becomes difficult
Solution Approach 1:
The spring is extracted from the slider body and attached to the pull tab shaft instead. This relocation moves the elastic component from the slider housing to the moving pull tab assembly, significantly reducing the space required within the slider body
Solution Approach 2:
The spring is nested on the pull tab shaft, utilizing the existing rotational axis structure. The spring surrounds the shaft and engages with features on the shaft itself, nesting the elastic component within the existing geometric framework rather than requiring additional housing space
3Reliability
If the slider is configured with a hinge spring mechanism, then the pull tab can be maintained, but automatic assembly becomes difficult and manual mounting is required
Solution Approach 1:
The spring, cam surface, and pull tab are merged into a single pre-assembled unit. The spring is positioned on the shaft and secured with a retaining ring during pull tab manufacturing, creating a pre-integrated assembly that can be automatically installed as one piece rather than requiring multiple separate assembly steps
Solution Approach 2:
The spring and retaining ring are pre-positioned on the pull tab shaft during the pull tab manufacturing process. This preliminary assembly of the elastic mechanism is completed before the pull tab is installed in the slider, allowing for automated assembly line integration
4Adaptability or versatility
If the pull tab can pivot freely, then it can lie down toward either side, but this causes operational issues and the slider may move freely
Solution Approach 1:
The cam surface is designed with an asymmetric profile that provides different geometric constraints for rotation in each direction. The cam surface geometry allows easy rotation in the intended operating direction while providing mechanical blocking in the opposite direction, creating asymmetric rotational behavior
Solution Approach 2:
The cam surface geometry is designed in advance to preemptively block excessive rotation in the wrong direction. The asymmetric cam profile creates a mechanical stop before the pull tab can rotate beyond the desired range, preventing operational errors before they occur
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains the pull tab in a consistent lay-down state, improves operability, and enables miniaturization and automatic assembly, addressing the complexity and weight issues of the existing design.
Implementation Method 1
a spring portion (32), a cam portion (45) which urges the pull tab (12) using the elastic force of the spring portion (32) in the direction in which the pull tab (12) returns to the lay-down state
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
There is provided a slider for a slide fastener which simplifies the structure, realizes miniaturization and lightness, and promotes improvement in operability. The slider for a slide fastener includes a slider main body 11 configured to engage and disengage a pair of fastener elements, a pull tab 12 which is attached to a pull tab attachment portion 20 and 21 of the slider main body 11, a stopper hook 13 having one end configured to be engaged with the fastener elements to obstruct the slider main body from moving, a spring portion 32, a cam portion 45 configured to urge the pull tab in a direction in which the pull tab returns to a lay-down state where the pull tab 12 is lay down toward one side of the slider main body 11 using an elastic force of the spring portion 32 when the pull tab 12 pivots from the lay-down state to an erected state, and regulating portions 30 and 47 configured to obstruct the pull tab from pivoting further from the erected state so that the pull tab 12 is obstructed from pivoting to the other side of the slider main body 11.