Backing Pad Slots for Misaligned Sanding Disc Holes
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Solution Overview
Problem
Existing sanding disc backing pads require precise alignment of holes, leading to misalignment issues during sanding, which hinders dust removal and causes dust accumulation, especially with discs having multiple holes.
Innovation Solution
A backing pad design with concentric rings and equidistant slots allows for misalignment of up to 8 mm, ensuring inner holes match with slots for effective suction and dust removal, optimizing air flow and preventing dust accumulation by allowing any hole to align with a slot, maintaining uniform suction across the area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise alignment of holes is required in traditional backing pads, then dust removal effectiveness is improved, but ease of operation deteriorates due to difficulty in aligning holes
Solution Approach 1:
The invention changes the geometric parameters of the backing pad by replacing point holes with elongated slots. This parameter change allows the slots to accommodate misaligned holes while maintaining dust removal effectiveness, thus resolving the contradiction between reliability and ease of operation
Solution Approach 2:
The backing pad is segmented into multiple concentric rings with slots distributed across them. This segmentation allows different regions of the backing pad to independently accommodate holes at various positions, ensuring that at least some holes align with slots regardless of disc placement precision
2Manufacturing precision
If hole size is reduced to improve alignment precision, then manufacturing precision is improved, but air flow rate deteriorates
Solution Approach 1:
The invention transitions from zero-dimensional holes to one-dimensional slots by adding length in a specific direction. This dimensional change allows the opening area to be enlarged while maintaining precise alignment capability, as the slot's extended dimension provides tolerance for misalignment while the perpendicular dimension controls air flow rate
3Ease of operation
If slot width is increased to accommodate misalignment, then ease of operation is improved, but air speed deteriorates due to reduced flow rate
Solution Approach 1:
The invention optimizes the slot width parameter to achieve a balance between accommodation capability and air flow performance. The slot width is designed to be sufficient to accommodate expected misalignment while minimizing the reduction in air speed and flow rate
Solution Approach 2:
The slot width is designed to be slightly larger than the minimum required for perfect hole alignment, providing a margin of tolerance for misalignment. This excessive action in width compensation ensures ease of operation while the overall slot area is controlled to maintain adequate air flow rates
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 facilitates easy disc placement without specific alignment, ensuring all holes match with slots, improving dust removal efficiency and preventing damage to discs without holes on uneven surfaces, maintaining effective suction and air flow rates.
Implementation Method 1
designed to optimize the air flows and the suction in the inner part of the backing pad
Data Source
AI summary
The present invention relates to a backing pad (1) with slots for sanding discs with multiple holes, comprising three parts, upper, intermediate and lower, joined together by a fastening system in which the upper part (2), with a frustoconical shape, includes suction holes (7) and a central hole (8), characterized in that the intermediate part (3) comprises intermediate suction slots (5), a central hole (8′) and in the rear face some suction channels (6) bordered by upraised walls (10); and the lower part (4), with a frustoconical shape, and in which the intermediate part (3) will engage, comprises lower suction slots (11) and a central hole (8″), and said lower suction slots (11) are arranged in rings, concentric and equidistant between them, and the size of each of the lower suction slots (11) increases from the center to the periphery.