Inflatable Pool Bottom Sheet Tensioning to Prevent Wrinkles

Solution Overview

Problem

Inflatable pools in the current market suffer from undesired wrinkles in the bottom sheet due to uneven stress distribution between the inner and outer walls, leading to aesthetic degradation and a compromised user experience.

Innovation Solution

The design includes a toroidal inflatable chamber with a first and second welding seam positioned to form a central angle between 5° and 32°, with the second seam placed outwardly relative to the vertical axis of symmetry, and optionally incorporating a tensioning member to prevent inward translation of the bottom sheet during inflation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the inner wall and outer wall are made of the same material with the same length, then the manufacturing process is simplified, but the outer wall reaches its elastic limit earlier than the inner wall, causing the bottom sheet welding position to displace inwardly and create wrinkles

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidbottom sheet welding position stability

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies local quality by making the inner wall longer than the outer wall, creating asymmetric stress distribution characteristics. This local dimensional difference allows the inner wall to compensate for the outward displacement of the bottom sheet welding position during inflation, preventing wrinkles while maintaining manufacturing simplicity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces asymmetry by deliberately designing the inner wall to be longer than the outer wall, breaking the symmetric structure. This asymmetric configuration creates different stress distribution patterns where the inner wall's greater length allows it to accommodate the inward displacement tendency of the bottom sheet welding position, eliminating wrinkles.

Inventive Principle:

Principle #4Asymmetry

2Device complexity

If the inner wall and outer wall have the same length, then the structure is symmetric and easier to manufacture, but the inner wall stretches and expands inwardly more quickly than the outer wall expands outwardly, driving the bottom sheet welding position to displace inwardly

Engineering Contradiction:

Improvestructural symmetryVSAvoidbottom sheet flatness

Core Design Contradiction:

Device complexityVSShape

Solution Approach 1:

The patent applies local quality by making the inner wall longer than the outer wall, creating asymmetric stress distribution characteristics. This local dimensional difference allows the inner wall to compensate for the outward displacement of the bottom sheet welding position during inflation, preventing wrinkles while maintaining manufacturing simplicity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces asymmetry by deliberately designing the inner wall to be longer than the outer wall, breaking the symmetric structure. This asymmetric configuration creates different stress distribution patterns where the inner wall's greater length allows it to accommodate the inward displacement tendency of the bottom sheet welding position, eliminating wrinkles.

Inventive Principle:

Principle #4Asymmetry

3Strength

If the outer wall has a greater total surface area than the inner wall, then the structural integrity is improved, but the outer wall is subjected to relatively more pressure and reaches its elastic limit earlier than the inner wall

Engineering Contradiction:

Improvestructural integrityVSAvoidwall stress distribution

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The patent applies local quality by making the inner wall longer than the outer wall, creating asymmetric stress distribution characteristics. This local dimensional difference allows the inner wall to compensate for the outward displacement of the bottom sheet welding position during inflation, preventing wrinkles while maintaining manufacturing simplicity.

Inventive Principle:

Principle #3Local quality

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

Prevents large wrinkles in the bottom sheet, maintaining a smooth and aesthetically pleasing surface, thereby enhancing the user experience.

Implementation Method 1

the outer wall, having a greater total surface area than the inner wall, is subjected to relatively more pressure than the inner wall, so that there is more stress inside the outer wall, and thus the outer wall reaches its elastic limits earlier than the inner wall

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

incorporating a tensioning member to prevent inward translation of the bottom sheet during inflation

Methodology Applied

Scientific EffectTension: Tension

Data Source

PatentUS20260078594A1Inflatable pool with bottom sheet tensioning

Publication Date: 2026.03.19 BESTWAY INFLATABLES & MATERIAL

AI summary

The present disclosure describes an inflatable pool. The inflatable pool includes an inner wall and an outer wall, which are connected along a first welding seam to form a first inflatable chamber; and a bottom sheet, which is connected to the outer wall along a second welding seam. The inflatable chamber and the bottom sheet define a water containing cavity. The present disclosure may effectively prevent wrinkling of the bottom sheet after the inflatable pool is inflated.