End Brush Bristle Flare Reduction via Angled Outer Cut
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Solution Overview
Problem
Conventional end brushes flare outward when attached to rotary tools and spun at high speeds, making it difficult to maintain contact with surfaces, especially in inside corners or recessed areas, leading to premature bristle bending and breaking.
Innovation Solution
The end brush design features inner bristles of uniform length and outer bristles cut shorter and angled relative to the rotational axis, reducing flare and allowing easier access to corners without additional pressure, maintaining contact with surfaces during high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional end brushes with uniform bristle lengths are used, then the brush structure is simple and easy to manufacture, but the bristles flare outward at high speeds making it difficult to maintain contact with surfaces
Solution Approach 1:
The patent applies local quality by varying the bristle lengths based on their radial position. Inner bristles have a first length while outer bristles have a second length that is 75-90% of the first length. This localized differentiation allows the brush to maintain contact with surfaces at various radii during rotation, with shorter outer bristles compensating for the centrifugal flare effect.
Solution Approach 2:
The patent changes the physical parameters of the bristles by cutting them at an angle of 10-45 degrees relative to the rotational axis. This angular parameter change, combined with the length variation, modifies the bristle orientation and contact characteristics, enabling the brush to effectively reach into corners and recesses while rotating at high speeds.
2Ease of operation
If pressure is applied to overcome bristle flare, then contact with the work piece is maintained, but the bristles bend and break prematurely
Solution Approach 1:
The differentiated bristle lengths create local contact zones where inner and outer bristles contact the surface at different points. This distributes the contact pressure more evenly across the brush face, preventing concentration of stress on individual bristles and reducing premature failure.
Solution Approach 2:
The bristles are pre-positioned at specific angles and lengths before operation. The angled cutting and length variation are predetermined configurations that automatically position the bristle tips to contact the work surface at optimal points during rotation, eliminating the need for excessive applied pressure.
3Productivity
If the brush is spun at high speeds, then cleaning efficiency increases, but the centrifugal force causes bristle flare reducing access to inside corners
Solution Approach 1:
The patent creates different contact zones with inner and outer bristles of varying lengths. The shorter outer bristles are specifically designed to reach into corners and recesses while the inner bristles maintain contact on broader surfaces, enabling the brush to adapt to various geometric features during high-speed operation.
Solution Approach 2:
The angled bristle configuration allows the brush to dynamically adapt to different surface geometries during rotation. The bristles naturally orient themselves based on the contact point and rotational speed, enabling automatic adjustment to reach into corners while maintaining overall contact pressure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design minimizes bristle flare and prevents premature bending, allowing for effective cleaning and polishing in tight spaces with reduced pressure and increased contact area, even at high speeds.
Implementation Method 1
the bristles flare outwardly when the brush is chucked into or otherwise attached to a rotary tool and spun at high speeds
Data Source
AI summary
An end brush is disclosed. In an illustrative implementation, a plurality of bristles are each fastened at a fixed end to a body. The bristles include a plurality of inner bristles proximal to a rotational axis of the body, and a plurality of outer bristles distal to the rotational axis. The inner bristles have a substantially uniform length. The outer bristles are cut at lengths shorter than the inner bristle length, and at an angle to the rotational axis.