Curved Elastic Buffer Section for Sander Disk Stability
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Solution Overview
Problem
Conventional sanders experience edge lift during oscillation due to uneven deformation of straight elastic vertical pillars, leading to reduced contact with the work surface and premature fracture at the center, resulting in a short lifespan.
Innovation Solution
A durable sander design incorporating an oscillation buffer element with a curved elastic buffer section that connects the sander body and sanding disk, allowing for extended deformation and stabilization of the sanding disk's oscillation on a single plane, reducing stress concentration and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If straight elastic vertical pillars are used to connect the sander body and sanding disk, then the structure is simple and easy to manufacture, but the sanding disk edge lifts during oscillation and the pillars fracture prematurely
Solution Approach 1:
The patent applies curvature by designing the elastic buffer section in an arc shape rather than a straight line. This curved structure allows the pillar to deform more uniformly during oscillation, preventing edge lift of the sanding disk while maintaining manufacturing feasibility. The arc-shaped buffer section distributes stress more evenly along the pillar length, eliminating the concentration of stress at the center portion that causes premature fracture in straight pillars.
2Device complexity
If straight elastic vertical pillars are used to connect the sander body and sanding disk, then the structure is simple, but the center portion of the pillars is easily fractured resulting in short lifespan
Solution Approach 1:
The arc-shaped elastic buffer section redistributes mechanical stress along its length during oscillation, preventing stress concentration at the center portion. The curved geometry provides a more favorable stress distribution pattern that reduces maximum stress values, thereby extending the fatigue life of the pillar structure while maintaining overall structural simplicity.
Solution Approach 2:
The patent changes the geometric parameter of the pillar from a straight line to an arc shape. This parameter change fundamentally alters the stress distribution characteristics during deformation, transforming the stress concentration problem at the center into a more uniform stress distribution along the buffer section, thus extending component lifespan.
3Ease of manufacture
If elastic vertical pillars with straight structure are used, then manufacturing is easy, but uneven deformation occurs during oscillation causing edge lift
Solution Approach 1:
The arc-shaped elastic buffer section is designed to deform uniformly during sanding disk oscillation. The curved geometry ensures that all portions of the pillar undergo comparable deformation, preventing the uneven deformation that causes edge lift in straight pillars. This maintains the sanding disk plane stability while remaining manufacturable through standard forming processes.
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
The curved elastic buffer section enables stable horizontal oscillation of the sanding disk on a single plane, extending the sander's lifespan by distributing stress and maintaining consistent contact with the work surface.
Implementation Method 1
an elastic buffer section interposed between the first connection end and second connection end. The elastic buffer section is formed at a length greater than a distance between the first and second connection ends
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A durable sander comprises a body (20) with a drive motor (22), a sanding disk (30) driven by the drive motor (22) to perform sanding movement against the body (20) and at least one oscillation buffer element (40). The oscillation buffer element (40) includes an upper connection bar (41) fastened to the body (20), a lower connection bar (42) fastened to the sanding disk (30) and a plurality of buffer portions (43) bridging the upper connection bar (41) and lower connection bar (42) in an integrated manner. Each buffer portion (43) has a first connection end (431) connected to the upper connection bar (41), a second connection end (432) connected to the lower connection bar (42) and an elastic buffer section (433) interposed between the first connection end (431) and second connection end (432). The length of the elastic buffer section (433) is greater than the distance between the first connection end (431) and the second connection end (432).