Collapsible Water Bucket With Threaded Collar for Leak-Proof Capacity

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Solution Overview

Problem

Collapsible water containers are limited in volume and lack secure lid engagement, as existing lids are secured via frictional engagement rather than threaded engagement.

Innovation Solution

A collapsible container with EVA walls and a polypropylene threaded collar and lid, secured via a two-shot injection molding process, forming a hard plastic threaded lid and collar for enhanced security and volume capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If collapsible containers are used to transport water, then portability and collapsibility are improved, but the volume capacity is limited

Engineering Contradiction:

ImprovecollapsibilityVSAvoidwater storage capacity

Core Design Contradiction:

Ease of operationVSVolume of stationary object

Solution Approach 1:

The container is divided into collapsible EVA walls and a rigid polypropylene body with threaded collar. The collapsible sections can be folded inward while the rigid sections maintain structural integrity and volume capacity, allowing the container to transition between compact storage and high-capacity water storage modes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The container combines different materials with complementary properties: flexible EVA material for collapsible walls that can be folded, and rigid polypropylene for the body, threaded collar, and lid that maintain structural strength and volume. This composite construction enables both high capacity and collapsibility.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If frictional engagement is used to secure the lid, then ease of operation is improved, but reliability and leak-proof performance deteriorate

Engineering Contradiction:

Improvelid opening easeVSAvoidleak-proof performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The frictional engagement mechanism is replaced with a threaded mechanical fastening system. The threaded collar and lid create a positive mechanical lock through rotational engagement, eliminating reliance on friction alone. This provides both secure leak-proof sealing and reasonable ease of operation through unscrewing motion.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12617589B2Collapsible water bucket with screw-on lid

Publication Date: 2026.05.05 COLAPZ LIMITED

AI summary

A portable collapsible container for transporting fluids. The container is formed of flexible walls that can be folded to collapse the container. A specialized rim is connected to the container walls through a transition collar which enables a hard rim to be joined to relatively soft and pliable walls. A metallic ring is embedded in an upper aspect of the container to maintain the container in cylindrical form and prevent denting of the rim which could cause separation of the lid from the rim.