Shoulder Strap Fixing Assembly with Threaded Retention
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Solution Overview
Problem
Existing methods for fixing shoulder straps to cases and trunks, such as using spring clips or adhesive bonding, are unreliable for professional and technical applications where accidental separation of the strap from the case can occur due to breakage or seam failure, necessitating frequent checks for reliability.
Innovation Solution
An assembly featuring receptacles with female threads and screws for detachable retention of the shoulder strap ends, allowing for easy installation and verification of the strap's solidity, with components like screws and eyelets ensuring secure engagement and quick replacement of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring clips or adhesive bonding are used to fix the shoulder strap, then the device complexity and manufacturing cost are reduced, but the reliability and strength of the fixing are insufficient for professional applications
Solution Approach 1:
The fixing assembly is divided into separate functional components: a receptacle integrated into the case, a retention element with female thread, and a screw with head. This segmentation allows each component to perform its specific function optimally while maintaining overall reliability. The receptacle provides structural integration, the retention element provides threaded engagement, and the screw provides adjustable fastening with visual verification capability.
Solution Approach 2:
The receptacle is pre-formed with a through-hole and integrated female thread during case manufacturing. This preliminary preparation eliminates the need for post-manufacturing drilling or threading operations, reducing assembly complexity while ensuring precise alignment and reliable thread engagement for the retention element and screw.
2Strength
If low-cost techniques like stitches or adhesive bonding are used, then the ease of manufacture is improved, but the strength and durability of the fixing are compromised under critical loads
Solution Approach 1:
The invention replaces weak mechanical connections (stitches, adhesive bonding) with a robust threaded mechanical fastening system. The female thread in the retention element engages with the screw, creating a high-strength connection capable of withstanding critical loads. This mechanical substitution maintains ease of manufacture through standardized threading and simple assembly operations.
Solution Approach 2:
The receptacle merges multiple functions into a single integrated component: it provides structural mounting, houses the female thread for engagement, and includes the through-hole for screw insertion. This consolidation simplifies the manufacturing process by reducing the number of separate parts while maintaining high attachment strength through the integrated design.
3Reliability
If rigid fixing methods are used to ensure reliability, then the reliability of the shoulder strap attachment is improved, but the ease of operation for checking and replacing parts is reduced
Solution Approach 1:
The fixing system transitions from a static, permanent connection to a dynamic, adjustable connection. The screw can be easily inserted, removed, and reinserted, allowing the user to check the state of the fixing and replace worn parts as needed. This dynamic capability maintains reliability while significantly improving ease of operation for maintenance and inspection.
Solution Approach 2:
The screw acts as an intermediary element between the receptacle and the shoulder strap. It provides a simple, tool-based interface that allows users to easily assemble and disassemble the connection without complex tools or procedures. The screw's head provides a visual indicator of proper installation, facilitating quick checks of fixing reliability.
4Ease of operation
If through holes are provided in the case for screw insertion, then the ease of operation for assembly and inspection is improved, but the structural integrity of the case may be compromised
Solution Approach 1:
The through-hole is pre-formed in the receptacle during case manufacturing, ensuring proper positioning, size, and structural reinforcement around the opening. This preliminary action eliminates the need for field drilling that could compromise case integrity, while still providing easy access for screw insertion and visual inspection of the fixing assembly.
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 assembly provides maximum reliability and ease of use by ensuring the shoulder strap remains securely attached, allowing for regular checks and simple replacement of worn parts, enhancing safety and usability in critical applications.
Implementation Method 1
said receptacle being affected laterally by at least one through hole for the insertion of a respective screw, which is suitable to engage detachably in said female thread
Implementation Method 2
its head being in turn engaged in at least one eyelet provided in said end of the shoulder strap
Data Source
AI summary
An assembly for fixing a shoulder strap to containers, such as cases, trunks and the like, comprising, for each one of the ends of the shoulder strap, a respective receptacle, which is provided at the outer surface of the case and is adapted to accommodate at least one element for detachable retention of the end which is provided with at least one female thread, the receptacle comprising laterally at least one through hole for insertion of a respective screw, which is adapted to engage detachably in the female thread, its head being engaged in at least one eyelet provided in the end of the shoulder strap.