Recessed Hook Strap Structure for Sewable Thin Fastening

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Solution Overview

Problem

Conventional male straps with hook structures have a thick thickness due to protruding configurations, making them unsuitable for attachment on cloths, bags, or shoes by sewing.

Innovation Solution

A strap member design with hook portions that have hook structures penetrating through the strap body and not protruding beyond its surface, featuring a thin thickness, allowing for attachment by sewing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If hook structures are disposed protruding on the male surface, then the male surface can be adhesively bound with the female surface, but the thickness of the strap becomes thick

Engineering Contradiction:

Improveadhesive binding strengthVSAvoidstrap thickness

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The hook structures are nested within the thickness of the strap body, specifically disposed in recesses formed on the male surface. This nesting approach allows the hook structures to be contained within the strap's overall thickness rather than protruding beyond it, thereby maintaining a thin profile while preserving the adhesive binding function through engagement with loop structures on the female surface.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The male surface is designed with localized recesses that contain the hook structures, creating areas of different depth and functionality. By concentrating the hook structures within these recesses rather than having them uniformly protrude across the entire surface, the design achieves thin overall thickness while maintaining localized adhesive binding capability where needed.

Inventive Principle:

Principle #3Local quality

2Reliability

If hook structures protrude from the strap surface, then engagement with loop structures is achieved, but the strap cannot be attached by sewing on thin materials

Engineering Contradiction:

Improveengagement reliabilityVSAvoidattachment applicability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The hook structures are nested within the strap body thickness, specifically disposed in recesses on the male surface. This nesting enables the strap to maintain a thin profile suitable for sewing onto thin materials like cloths, bags, and shoes, while the hook structures remain functional for reliable engagement with loop structures on the female surface.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of having hook structures protrude outward from the strap surface, the design inverts the approach by placing them within recesses that are flush with or recessed into the strap surface. This inversion allows the strap to be thin and sewable while maintaining the engagement function through the recessed hook structures.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12507766B2Strap member and strap assembly therewith

Publication Date: 2025.12.30 UNIVERSAL TRIM SUPPLY CO LTD

AI summary

A strap member is provided and includes a strap body and a plurality of hook portions. The strap member includes a first surface and a second surface. Each of the plurality of hook portions includes a hole structure and at least one hook structure. The hole structure penetrates through the strap body and includes a first opening formed on the first surface and a second opening formed on the second surface. The at least one hook structure is at least partially disposed inside the hole structure and connected to a hole wall of the hole structure. Besides, a related strap assembly is also provided.