Segmented Thread Tank for Paint Sprayer Leaks
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Solution Overview
Problem
Traditional gravity cups for paint sprayers suffer from leaks due to nonhomogeneous rigidity and wall thickness aggregations around the external circumference, leading to leaks, especially when manually handled.
Innovation Solution
A gravity cup design featuring a multiplex quick-connect thread with at least two external and internal thread turns, each formed by multiple segments with gaps, and guide ramps for improved screwing behavior, ensuring constant rigidity and tightness between the tank and cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional continuous external thread turns are used on the tank circumference, then the connection between tank and cover can be achieved, but wall thickness aggregations occur during injection molding causing nonhomogeneous rigidity and leaks
Solution Approach 1:
The continuous external thread turn is divided into multiple separate thread segments arranged along the slope line of the thread. This segmentation prevents wall thickness aggregations during injection molding while still providing sufficient connection points for the cover, thereby maintaining manufacturing precision and reliability
Solution Approach 2:
Thread segments are strategically positioned at specific locations around the tank circumference rather than forming a continuous structure. This allows the tank wall to maintain uniform thickness and rigidity in non-thread areas while still providing adequate threading for connection, resolving the conflict between connection reliability and manufacturing uniformity
2Ease of operation
If the tank is manually handled in the upper rim area, then portability and ease of operation are improved, but local deformation occurs causing leaks due to nonhomogeneous rigidity
Solution Approach 1:
By segmenting the thread structure, the tank rim maintains more uniform rigidity distribution. This allows the tank to be manually handled without localized stress concentrations that would cause deformation and leaks, while still providing secure connection when the cover is screwed on
Solution Approach 2:
The thread design changes the mechanical parameters of the tank rim by distributing stress more evenly through multiple discrete thread segments rather than a continuous structure. This parameter change allows the rim to withstand manual handling forces without deforming the sealing area
3Productivity
If a quick-connect thread with few turns is used, then assembly speed is improved, but the connection may loosen due to vibrations during operation
Solution Approach 1:
Multiple thread segments around the circumference provide numerous contact points for the cover, increasing friction and mechanical interlocking. This allows the connection to remain stable during vibrations while still achieving quick assembly, as the segments collectively provide strong engagement without requiring many thread turns
Data Source
AI summary
The invention relates to a gravity cup for a paint sprayer, having a cup-shaped tank (1) and a cover (2) that can be placed on the tank (1), a multiplex quick-connect thread having at least two external thread turns (18) and internal thread turns (19) engaging with the external thread turns (18) for connecting the tank (1) and the cover (2), characterized in that each external thread turn (18) is formed of a plurality of thread segments (18a, 18b, 18j) disposed along the pitch line of each external thread turn, wherein a gap (18p, 18q . . . 18w) is formed between adjacent thread segments.