Messenger Bag Strap Swivel Coupling for Kink-Free Rotation
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Solution Overview
Problem
Existing messenger bag strapping systems fail to facilitate unimpeded pivoting at joints, leading to strap kinking and discomfort when shifting the bag between shoulders, and the addition of a third stabilizing strap complicates shoulder adjustments.
Innovation Solution
The implementation of quick-release swivel couplings and multi-rotatable couplers that allow for continuous rotation and secure attachment of straps, enabling seamless shoulder shifts without kinking and simplifying the process of repositioning the bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional D-ring and swivel hook assemblies are used for strapping, then basic attachment function is provided, but strap rotation is limited to 90 degrees and full rotation is not possible
Solution Approach 1:
The patent implements nested rotation by placing a second swivel mechanism inside the first swivel mechanism. The outer swivel allows rotation about a first axis, while the inner swivel allows rotation about a second axis perpendicular to the first. This nested arrangement enables full 360-degree rotation capability while maintaining a compact structure that does not significantly increase overall device complexity.
2Adaptability or versatility
If multiple swivel mechanisms are added to enable full rotation, then strap pivoting freedom is improved, but the system becomes less controlled and may accidentally disconnect
Solution Approach 1:
The swivel mechanisms incorporate automatic locking features that engage when the strap is under tension. The design allows the strap's own axial force to maintain the connection stability while still permitting controlled pivoting motion. The locking mechanism activates automatically based on the applied load, providing self-regulating control without requiring additional active components.
3Stability of the object's composition
If a third stabilizing strap is added to maintain diagonal orientation, then bag stability is improved, but shoulder shifting becomes more complex and time-consuming
Solution Approach 1:
The patent implements dynamic adjustability by making all strap connections detachable and equipping them with swivel mechanisms. This allows the user to quickly detach and reattach straps to switch between shoulders, and the swivels enable the straps to automatically adapt to different body positions. The third stabilizing strap can be easily repositioned without complex adjustments, maintaining bag stability while facilitating quick shoulder transitions.
4Strength
If non-detachable buckles are used, then connection strength is maintained, but the ability to pivot without kinking straps is lost
Solution Approach 1:
The patent segments the buckle into detachable components with separate swivel mechanisms at each connection point. This segmentation allows the strap to pivot freely at the buckle junction without kinking, while the buckle itself maintains strong connection capability when engaged. The modular design enables both pivoting freedom and connection strength to coexist by allowing relative motion between segmented parts.
Data Source
AI summary
A strapping system used to hold a messenger bag or the like to a person. The system includes multi-component multi-attachment rotating and detachable buckles which provide pivoting motion about the intersection points of non-axial forces. The system allows for switching shoulders and adjusts to changing angles induced by changing the position of the bag on the person.