Elastic Backpack Backplate Assembly for Shoulder Load Relief

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Solution Overview

Problem

Existing backpack assemblies cause discomfort and burden on the user due to the separation of the backplate from the back, leading to increased force on the shoulders, particularly near the collarbone, when the shoulder belt displaces rearward.

Innovation Solution

Incorporation of an elastic member fixed to the backplate and a shoulder belt with an accommodating part that allows the backplate to maintain contact with the user's back by bending along the shoulders, reducing the separation and distributing the force more evenly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the shoulder belt is worn on the user's back, then the backpack assembly can be carried, but the shoulder belt displaces rearward causing the upper portion of the backplate to separate from the user's back, resulting in increased force on the front portions of the shoulders

Engineering Contradiction:

Improvecomfort of wearingVSAvoidforce on front portions of shoulders

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The patent introduces an elastic member that allows dynamic adjustment of the backplate position. When the shoulder belt is worn, the elastic member stretches to pull the upper portion of the backplate toward the user's back, maintaining contact dynamically rather than being fixed in a static position that causes separation and discomfort.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the upper portion of the backplate separates from the user's back, then the shoulder belt can accommodate movement, but a greater force is exerted on the front portion of the user's shoulders

Engineering Contradiction:

Improveaccommodation of movementVSAvoidburden on user

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical state of the connection between the backplate and shoulder belt by introducing an elastic member that can stretch and retract. This allows the system to adapt to movement (maintaining adaptability) while simultaneously maintaining the backplate's contact with the user's back (reducing harmful force concentration on the shoulders).

Inventive Principle:

Principle #35Parameter changes

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 solution effectively reduces the burden on the user's shoulders by maintaining the backplate in close contact with the back, minimizing the force exerted on the front portions of the shoulders.

Implementation Method 1

an elastic member fixed on the backplate and configured to stretch in the up-down direction

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12507786B2Backpack assembly

Publication Date: 2025.12.30 MAKITA CORP

AI summary

A backpack assembly may include a backplate extending in an up-down direction; an elastic member fixed on the backplate and configured to stretch in the up-down direction; and a shoulder belt including an accommodating part. The accommodating part may include an opening for inserting the elastic member and accommodate a portion of the elastic member.