Strap Adjustment Rings With Textured Zone
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Solution Overview
Problem
Existing strap adjustment and tightening devices face difficulties in maintaining the strap in position under stress, especially as the strap wears, due to insufficient friction, leading to potential slippage and premature wear, which affects the quality perception and ease of adjustment.
Innovation Solution
A strap adjustment device comprising a first and second ring with a textured zone on the first ring, where the second ring bears against the first ring, increasing friction through protrusions or spikes that sink into the strap, allowing for variable slot thickness and effective locking without degrading ease of adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the friction between the rings and the strap is increased to prevent slippage under stress, then the strap locking reliability is improved, but the strap surface condition deteriorates due to accelerated wear
Solution Approach 1:
The first ring is designed with a textured zone localized at specific contact points with the strap, while other areas remain smooth. This localized texturing increases friction only where needed for locking reliability, without causing accelerated wear across the entire strap surface. The textured zone comprises protrusions or spikes concentrated at the interface between the first ring and strap, providing enhanced grip without the detrimental effects of universal roughening.
2Reliability
If the friction between the rings and the strap is increased to prevent slippage, then the strap maintenance in position is improved, but the ease of adjustment deteriorates
Solution Approach 1:
The textured zone is positioned specifically at the contact interface between the first ring and strap, while the second ring maintains a smooth surface. This localized approach ensures that friction enhancement occurs only where the first ring contacts the strap for locking, while the smooth second ring interface facilitates easy sliding and adjustment operations. The protrusions are confined to a localized region rather than covering the entire ring surfaces.
3Reliability
If the lower ring is conformed to present a rough edge to ensure sufficient friction, then the strap locking is improved, but the strap wear accelerates in the friction zone
Solution Approach 1:
Instead of conforming the entire lower ring with a rough edge, the invention applies a textured zone with protrusions or spikes only at the specific contact points where friction is needed. This localized texturing provides sufficient locking force while minimizing the contact area with the strap, thereby reducing overall wear. The protrusions are strategically positioned to engage the strap only when locking is required.
Solution Approach 2:
Rather than making the ring edge rough to increase friction, the invention uses discrete protrusions or spikes that concentrate friction forces at specific points. This inverted approach from continuous roughness to discrete contact points achieves the same locking effect with reduced overall wear on the strap surface.
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 device effectively maintains the strap in position under stress, reducing slippage and wear, while maintaining ease of adjustment and preventing premature wear, thus enhancing the quality of the locking mechanism.
Implementation Method 1
the friction between the rings and the strap is no longer sufficient to prevent the strap from slipping
Data Source
Figure 1~6
Figure 3~5
AI summary
The strap adjustment and tightening device (2) (7) comprises first and second rings (3, 4) arranged in a overlapping fashion to define a slot (6) for the strap (7). The second ring (4) rests against the first ring (3). The slot (6) for the strap (7) is delimited by an outer edge (4b) of the second ring (4) and an inner edge (3a) of the first ring (3). The two rings (3, 4) are movable relative to each other so that the slot (6) for the strap (7) has a variable thickness. A lower surface of the first ring (3), opposite the upper surface of the first ring (3), has a textured area (8) with several protruding elements (9) designed to create an increased friction zone between the strap (7) and the lower surface of the first ring (3). The textured area (8) is separated from the outer edge (4b) of the second ring (4) by the slot (6) for the passage of the strap (7).