Drywall Corner Sander with Internal Pivot Axes
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Solution Overview
Problem
Existing drywall corner sanders with universally pivotal handles have bulkier designs due to pivot axes located above or outside the sander body, leading to excessive sanding forces on the outer edges, causing undesirable grooves in the drywall.
Innovation Solution
A drywall corner sander with a universally pivotal handle where both pivot axes are located within the sander's cavity, minimizing sanding forces on the outer edges by concentrating pressure at the juncture of the side walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pivot axes are located above or outside the sander body, then the handle can be universally pivoted, but the sander becomes bulkier and requires more storage space
Solution Approach 1:
The pivot axes are nested within the cavity of the sander body rather than being positioned externally. The first pivot axis is positioned within the cavity between the side walls, and the second pivot axis is positioned within the cavity near the juncture, allowing the handle to universally pivot while keeping the overall sander compact and reducing storage space requirements.
2Adaptability or versatility
If pivot axes are located above or outside the outer edges of the base, then the handle can be universally pivoted, but excessive sanding forces are transmitted to the outer edges causing grooves in the drywall
Solution Approach 1:
The pivot axes are strategically positioned within the cavity of the sander body, specifically between the side walls and near the juncture. This local positioning ensures that sanding forces are concentrated at the juncture where the corner sander contacts the drywall corner, rather than being transmitted to the outer edges. The sanding pad applies pressure locally at the corner junction, preventing groove formation along the outer edges while maintaining universal pivoting capability.
Data Source
AI summary
An improved drywall corner sander is provided with an elongated body having opposite sides, and a pair of spaced apart braces extending between the sides. An axle is pivotally mounted between the braces so as to define a first longitudinal pivot axis. A tab on the axle defines a second, perpendicular pivot axis. A handle is connected to the tab of the axle so as to be pivotal about the first and second axes for easy operation of the sander without forming grooves in the side wall adjacent the outer edges of the sander. The pivot axes both reside within the cavity defined by the side walls of the sander.