Quick Attach Fluid Head for Spray Guns
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Solution Overview
Problem
Spray guns for fast-setting materials like polyurethanes and polyureas are difficult to disassemble and clean due to their rapid setting nature, requiring complex tools and processes.
Innovation Solution
A simple attachment method between the high-pressure fluid section and the lower-pressure air section, where the fluid head can be easily assembled or removed by turning ⅛ of a turn, utilizing protruding tabs and undercut features, and a locking mechanism to prevent over-rotation and secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fluid head is designed to be easily assembled and removed by turning only 1/8 of a turn, then the ease of operation is improved, but the device complexity increases due to the need for tabs, undercut features, and locking mechanisms
Solution Approach 1:
The spray gun is divided into distinct modular sections (fluid head, handle, hose manifold) that can be independently assembled and disassembled. The fluid head contains internal tabs and undercut features that segment the attachment mechanism, allowing it to engage and disengage through a limited 1/8 turn rotation while maintaining structural integrity.
Solution Approach 2:
Tabs and undercut features act as intermediary elements between the fluid head and handle. These intermediate structures facilitate the quick attach/detach function by providing engagement points that translate a small 1/8 turn rotation into secure mechanical coupling, eliminating the need for complex threading or multiple fasteners.
2Reliability
If the fluid head is secured with a locking tab feature that mates to a recess feature, then the reliability of the connection is improved, but the device complexity increases due to additional machining features
Solution Approach 1:
The locking tab feature and recess feature are merged into the existing modular structure of the spray gun. The locking tab is integrated into the hose manifold assembly, while the recess is formed in the handle, creating a unified locking mechanism that prevents rotation without requiring separate external locking components.
Solution Approach 2:
The locking mechanism is designed to be self-activating through the assembly process itself. As the fluid head is attached to the handle and the hose manifold is secured with the bolt, the locking tab automatically engages with the recess feature, providing self-service locking without requiring additional manual intervention or complex actuation mechanisms.
Data Source
AI summary
The fluid section or head (10) for a plural component applicator can be easily assembled or removed from the air section (12) by turning the fluid head ⅛ of a turn. The fluid head (10) has four tabs (14) that protrude and engage with four undercut features (16) within the handle (12). Tabs (14) are inserted through corresponding openings (16) in the front (12a) of air section (12) and rotated such that tabs (14) are retained behind lips (18). A locking tab feature (20) in the hose manifold (24) mates to a recess feature (22) in the handle (12) to prevent the fluid section (10) from rotating.