Paint Roller With 90 Degree Axial Bend for Corner Painting
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Solution Overview
Problem
Conventional paint rollers struggle to paint corner and edge areas efficiently without smearing paint, as the trim protruding from the roller body leads to irregular smearing when used in 90° angles, requiring taping off or using additional tools like corner brushes or edge rollers.
Innovation Solution
The paint roller body features a 90° radial bend along its axial extent, allowing it to maintain contact with adjacent surfaces in corner areas, with a sleeve connecting symmetrical half-shells and a trim for even paint distribution, enabling simultaneous painting of adjacent surfaces without smearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional paint roller with straight bristles is used in corner areas, then the roller can be applied to flat surfaces, but the bristles cause uneven smearing on adjacent walls or ceilings meeting at 90° angles
Solution Approach 1:
The roller body is divided into two essentially symmetrical half-shells that can be separated and reconnected. This segmentation allows the roller to be opened into a V-shape configuration with the 90° bend, enabling the bristles to conform to corner geometries while maintaining control over paint application.
Solution Approach 2:
The roller body profile is changed from a straight linear design to one with a radially outward-pointing 90° bend in the axial direction. This dimensional change in the profile geometry allows the roller to reach into and paint corner areas effectively by creating a V-shaped opening that accommodates the 90° angle between surfaces.
2Ease of operation
If masking is used to protect corner areas from smearing, then paint application on flat surfaces is simplified, but the painting process requires additional preparation and time
Solution Approach 1:
By segmenting the roller body into two half-shells that can be opened apart, the invention eliminates the need for masking in corner areas. The V-shaped configuration naturally directs paint application away from adjacent surfaces, removing the time-consuming masking step while maintaining operational simplicity.
Solution Approach 2:
The invention extracts or removes the need for masking by using the segmented roller design that inherently prevents paint smearing on corner surfaces. The V-shaped opening created by separating the half-shells extracts the harmful smearing effect before it can occur, eliminating the protective masking step.
3Adaptability or versatility
If corner brushes are used to paint edge areas, then corner coverage is achieved, but multiple applications are required as the brush can only hold a small amount of paint
Solution Approach 1:
The invention merges the corner painting function with the main roller body by integrating the 90° bent profile and V-shaped opening directly into the roller structure. This allows the roller to function both as a standard paint applicator for flat surfaces and as a corner painting tool, eliminating the need for separate corner brush applications and significantly improving productivity.
Solution Approach 2:
The roller body with the 90° bend and V-shaped opening configuration provides multi-functionality, serving both as a conventional paint roller for flat surfaces and as a specialized corner painting tool. This universal design eliminates the need for multiple specialized tools and applications,大幅提高 painting efficiency.
4Ease of manufacture
If the roller body is made as a single piece, then manufacturing is simpler, but the bristles cannot be opened or adjusted to reach corner areas
Solution Approach 1:
The roller body is segmented into two essentially symmetrical half-shells that can be separated to open the V-shaped configuration. This segmentation maintains relative manufacturing simplicity while enabling the bristles to be opened and adjusted to reach corner areas, achieving both ease of manufacture and corner accessibility.
Solution Approach 2:
The roller body is designed with dynamic capability through the separable half-shells connected by a sleeve with a slot, allowing the structure to change from a closed cylindrical form to an open V-shape. This dynamic configuration enables the bristles to reach corner areas while maintaining a simple manufacturing process for each half-shell component.
Data Source
Figure 1
Figure 2~3
Figure 4a~4c
AI summary
A paint roller (1) with a handle (2) and support rod (3), wherein a roller body (4) with bristles can be attached to the support rod (3) and is freely rotatable (double arrow D), has a roller body (4) which, in its profile, has a 90° bend (α) in the axial direction (double arrow A) as seen from the axial direction (double arrow R).