Hard-shell Backpack with Triangular Wheels and Hinged Frame

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Solution Overview

Problem

Existing backpack designs fail to address the issue of back strain caused by carrying heavy loads, particularly in school children, and lack the combination of a hard-shell structure, triangle-shaped wheels for stair climbing, and a concave back plate for comfort.

Innovation Solution

A hard-shell backpack system with a two-piece hinged plastic frame, triangle-shaped wheels, a retractable pull handle, concave back plate, and mesh net style pockets for comfortable and efficient load transport, reducing strain on the user's back and shoulders.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional backpack is used to carry heavy loads, then the backpack can transport books and personal belongings, but it causes harmful strain on the user's back and shoulders

Engineering Contradiction:

Improvecomfort of carryingVSAvoidback strain

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional shoulder strap mechanical system with a wheeled mechanical system. The backpack includes a pair of wheels (with triangle-shaped wheels for stair climbing) and a retractable pull handle, allowing the user to roll the backpack rather than carry it on shoulders, thereby eliminating back and shoulder strain while maintaining transport capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The backpack frame is divided into a two-piece hinged hard shell plastic structure, allowing the backpack to be segmented into manageable parts that can pivot and adapt to different terrains and carrying positions, improving both comfort and maneuverability

Inventive Principle:

Principle #1Segmentation

2Strength

If a hard-shell structure is used to protect contents, then durability is improved, but weight of the backpack increases

Engineering Contradiction:

Improveprotection of contentsVSAvoidbackpack weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent employs hard shell plastic material that provides durable protection for contents while maintaining reasonable weight. The two-piece hinged construction allows for optimized material distribution, providing strength where needed while minimizing overall weight through strategic structural design

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If triangle shaped wheels are added for stair climbing, then adaptability to different terrains is improved, but device complexity increases

Engineering Contradiction:

Improveterrain capabilityVSAvoidwheel structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The triangle-shaped wheels serve multiple functions: they enable the backpack to climb stairs, navigate uneven terrain, and provide stable rolling on flat surfaces. This single wheel design achieves versatility across different terrains without requiring multiple specialized wheel types, thereby limiting the increase in device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11737533B1Hard-shell backpack with wheels

Publication Date: 2023.08.29 JONES JOHN

AI summary

A two-piece hinged hard shell plastic frame includes a set of shoulder straps. Additionally, the backpack includes a pair of triangle shaped wheels for climbing stairs and a retractable pull handle. A concave back plate structure is positioned on the rear of the backpack for conforming to a person's back. A concave head rest portion is also included on the top end of the backpack which provides a comfortable resting area for a user's head. Furthermore, multiple mesh net style pockets on the exterior of the case for holding various items is provided.