Convertible Bag Strap System for Mode Switching
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Solution Overview
Problem
Existing bag conversion systems between dual shoulder and single shoulder carry modes are inefficient, particularly for heavier bags, as they often require disconnecting and reconnecting straps, lead to bag tilting, and expose components to scrapes or soiling, while failing to maintain ergonomic features and security.
Innovation Solution
A single loop strap system with fixed ends at the top of the back panel and centered anchoring points allows for seamless conversion between modes without disconnecting straps, incorporating a retractable hip belt, length adjustment buckles, and securing shoulder pads to maintain ergonomic features and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate backpack and side-carry straps are used, then conversion between modes is possible, but the conversion process is complex and time-consuming
Solution Approach 1:
The strap system is divided into two functional sections: a backpack strap section with shoulder pads and a side-carry strap section, connected by a quick-release mechanism. This segmentation allows each section to be optimized for its specific carry mode while enabling easy conversion between modes through simple disconnection and reconnection.
Solution Approach 2:
The strap system incorporates adjustable length mechanisms and reconfigurable connection points that allow the strap configuration to dynamically adapt between backpack and side-carry modes. The quick-release fasteners enable rapid reconfiguration without tools, making the system flexible and responsive to different carrying needs.
2Productivity
If quick-release fasteners are used for strap conversion, then conversion speed is improved, but components are exposed to scrapes or soiling
Solution Approach 1:
The quick-release fasteners and adjustment buckles are integrated into recessed areas or covered by protective flaps on the bag body when not in use. This nesting approach protects the mechanical components from external damage, scrapes, and soiling while keeping them accessible when needed for conversion.
3Ease of operation
If the bag is turned 90 degrees during conversion, then strap reconfiguration is simplified, but bag stability and ergonomics are compromised
Solution Approach 1:
By separating the backpack and side-carry strap functions into distinct sections with independent adjustment mechanisms, the system allows conversion without requiring the bag to be reoriented. Each strap section can be independently configured and attached to appropriate anchor points regardless of bag orientation.
4Adaptability or versatility
If independent backpack and side-carry straps are used, then each mode can be optimized, but the overall system weight increases
Solution Approach 1:
The backpack strap and side-carry strap are designed as integrated components of a single strap system, sharing common anchor points, adjustment mechanisms, and materials. This merging eliminates redundant structures while maintaining the ability to optimize each carry mode through selective configuration of the shared components.
Data Source
AI summary
A convertible shoulder bag and backpack includes: (a) a bag body defining front, back, top, bottom, first side, and second side panels; and (b) a strap defining first and second portions thereof extending between first and second pairs of connection points for connecting the first and second portions to the bag body, respectively. An interconnecting portion slidably extends between a pair of diagonally opposing connection points such that slidably increasing the length of the first portion decreases the length of the second portion and vice versa, the strap being configured to enable the convertible shoulder bag and backpack to be converted between a shoulder-bag configuration and a backpack configuration without disconnecting or reconnecting the strap. The strap may include a retractable hip belt and/or securing strap. Additionally, a tote handle may be coupled to the first and/or second portion by a length-multiplying interconnecting portion.