One-Piece Swivel Cap Snap-Lock for Secure Tube Attachment

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Solution Overview

Problem

Existing swivel caps for broom handles are often two-piece, complex, costly, difficult to install, and lack durability, making them aesthetically unappealing and less functional.

Innovation Solution

A one-piece swivel cap with annular indented collars and a snap-lock mechanism that securely attaches to a metal tube, allowing rotation and resisting a 27 kg (60 lbs) pulling force, featuring a simple design for easy installation and manufacturing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a two-piece swivel cap design is used, then the cap can be assembled with a metal tube, but the construction becomes complex and costly

Engineering Contradiction:

Improveattachment securityVSAvoidconstruction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the cap body and the locking mechanism into a single integrated piece. The indented collar and legs are all formed as one piece with the cap body, eliminating the need for separate components. This integration simplifies construction while maintaining secure attachment through the snap-lock mechanism formed by the indented collar engaging with the metal tube.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent segments the cap into functional zones: the indented collar for engagement with the metal tube, the legs for structural support and spacing, and the swivel mechanism. This segmentation allows each feature to perform its specific function while being formed as one piece, reducing assembly complexity.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a complex two-piece design is used, then attachment can be achieved, but manufacturing cost increases

Engineering Contradiction:

Improveattachment securityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By combining multiple components into a single molded piece, the patent reduces the number of parts that need to be manufactured, stored, and assembled. This integration lowers manufacturing costs while maintaining secure attachment through the integrated snap-lock mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The indented collar is designed to automatically engage with the metal tube through snap-locking when assembled. The structure is designed to be self-aligning and self-securing, eliminating the need for complex assembly mechanisms or additional fastening steps, thereby reducing manufacturing complexity and cost.

Inventive Principle:

Principle #25Self-service

3Reliability

If traditional swivel caps are used, then they can be installed, but installation becomes difficult

Engineering Contradiction:

Improveattachment securityVSAvoidinstallation ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments the attachment interface into a simple insert-and-rotate operation. The metal tube is inserted through the cap body, and the indented collar automatically engages with the tube's outer surface. This segmentation of the assembly process into simple steps makes installation easy while maintaining secure attachment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The snap-lock mechanism is designed to automatically engage when the metal tube is inserted into the cap. The indented collar and the tube's outer surface work together to create a self-securing attachment without requiring additional fastening operations, making installation simple and quick.

Inventive Principle:

Principle #25Self-service

4Ease of manufacture

If existing swivel caps are used, then they can be made, but they lack durability

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddurability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses a composite construction combining a plastic cap body with a metal tube. The plastic provides structural integrity and the indented collar geometry, while the metal tube provides strength and durability. This composite approach creates a durable assembly that maintains manufacturing simplicity through the integrated design.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The indented collar features a curved, rounded geometry that complements the metal tube's cylindrical shape. This curved design allows for smooth engagement and distributes stress evenly during rotation and pulling, enhancing durability while maintaining manufacturing simplicity through the molded plastic construction.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP4684922A1One piece swivel cap

Publication Date: 2026.01.28 AQUABLADE S R L S

Figure 1~4

AI summary

While the specification has disclosed one form in which the invention may be embodied, it is understood that this form is shown for illustrative purposes only, and that the invention is not limited to the specific disclosure but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all modifications and embodiments within the scope of the following claim.