Orbital Sander Disc Stabilizing Springs
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Solution Overview
Problem
The edge of a sanding disc is improperly risen during rotation due to the limitations of conventional pad supports in orbital sanders, which cannot stretch to accommodate the increased distance caused by eccentric displacement, leading to unstable sanding and reduced service life.
Innovation Solution
A sanding disc stabilizing structure is introduced, featuring a casing, sanding power source, sanding disc, and at least four springs. The springs have a free length greater than the initial spacing between the casing and sanding disc, allowing them to stretch and offset the increased distance caused by eccentric displacement, maintaining the sanding disc's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional pad support (railing or cylindrical) is used to limit vibration of the sanding disc, then the sanding disc can be kept within a range of pendulum diameter to perform stable orbital motion, but the pad support cannot stretch to accommodate the increased distance caused by eccentric displacement, causing the edge of the sanding disc to be risen improperly
Solution Approach 1:
The invention changes the physical state of the pad support from a rigid non-stretchable structure to a flexible spring structure that can elastically deform. The spring's ability to stretch and compress allows it to dynamically adapt to the changing distance between the sanding disc and casing during orbital motion, accommodating the eccentric displacement without causing the sanding disc edge to rise improperly.
Solution Approach 2:
The invention transforms the static pad support into a dynamic spring-based system that can continuously adjust its length during operation. The spring absorbs the repeated pulling forces (hundreds of thousands of times per hour) by compressing and extending, converting the harmful rigid constraint into a beneficial flexible adaptation that maintains contact while accommodating motion variations.
2Stability of the object's composition
If the pad support is disposed to limit vibration caused by moment of inertia, then the sanding disc performs stable orbital motion, but the direct distance between the pad support positions on the sanding disc and casing becomes longer during operation, which the non-tensile pad support cannot cope with
Solution Approach 1:
The spring's elastic property allows it to change its length parameter dynamically during operation. When the sanding disc moves and the distance between mounting positions increases, the spring extends to accommodate this change. This eliminates the geometric constraint problem where a rigid pad support would become too short and cause the sanding disc edge to rise.
3Productivity
If the orbital sander operates continuously with eccentric displacement occurring hundreds of thousands of times per hour, then productivity is improved, but the pad support is pulled continuously reaching ten millions of times per day when assembled on a robotic arm, which is difficult for the service life of the pad support
Solution Approach 1:
The spring-based pad support transforms the system from a rigid, high-stress connection to a flexible, energy-absorbing connection. The spring's elastic deformation capacity allows it to withstand repeated cyclic loading (hundreds of thousands to ten millions of times per day) without failure, dramatically extending the service life while enabling continuous high-productivity operation.
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 use of springs in the sanding disc stabilizing structure effectively maintains the stability of the sanding disc during orbital motion, preventing the edge from being improperly risen and extending the service life of the pad support by accommodating the increased distance caused by eccentric displacement.
Implementation Method 1
Each of the at least four springs is incompletely compressed in the spacing. During the orbital motion of the sanding disc, each of the at least four springs is stretched when the second end thereof deviates from a projection position of the first end.
Data Source
AI summary
A sanding disc stabilizing structure of an orbital sander comprises a casing, a sanding power source, a sanding disc, and at least four springs. The sanding power source is assembled on the casing and comprises a drive shaft and a tool holder disposed on the drive shaft and offset from an axis of the drive shaft. The center of the sanding disc driven by the sanding power source to perform an orbital motion is disposed on the tool holder with a locking screw. Two ends of each of the at least four springs are respectively disposed on the casing and the sanding disc. The free length of each of at least four springs is greater than the spacing between an installation part of the casing and an installation part of the sanding disc provided for one of the at least four springs.