Cam-Adjusted Orbital Stroke Mechanism for Tool-Free Stroke Changes
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Solution Overview
Problem
Existing random orbital machines lack the ability for users to adjust the stroke without special tools or disassembly, limiting their versatility and effectiveness in addressing various polishing and sanding tasks.
Innovation Solution
An adjustable stroke device with a housing, counterweight, mounting assembly, and stroke adjuster mechanism that allows users to vary the stroke radius by rotating an adjuster ring and cam mechanism, enabling secure locking positions through detents, thus adjusting the stroke without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stroke of the random orbital machine is fixed, then the device structure is simple and reliable, but the device cannot adapt to different polishing and sanding tasks
Solution Approach 1:
The patent implements an adjustable stroke mechanism that transforms the fixed static structure into a dynamic configurable system. The stroke adjuster allows users to change the stroke length between minimum and maximum positions, enabling the device to adapt to different polishing and sanding tasks while maintaining operational simplicity through a user-friendly adjustment interface
2Adaptability or versatility
If the stroke adjuster allows continuous adjustment, then the device offers maximum versatility, but the device complexity and difficulty of operation increase
Solution Approach 1:
The stroke adjustment mechanism is segmented into discrete adjustable positions along the stroke path. This segmentation allows the device to offer multiple predetermined stroke lengths without requiring continuous adjustment, simplifying the operation while maintaining versatility. Users can select from specific stroke positions rather than adjusting continuously, reducing operational complexity
Solution Approach 2:
The patent changes the stroke parameter through a mechanical adjustment system that modifies the offset distance between the driveshaft axis and backing axis. By providing discrete parameter settings rather than continuous adjustment, the system achieves versatility without excessive operational complexity, allowing users to select appropriate stroke lengths for different applications
3Productivity
If the offset between driveshaft axis and backing axis is increased, then the stroke length increases improving polishing effectiveness, but the machine becomes harder to control and generates more vibration
Solution Approach 1:
The adjustable offset mechanism allows dynamic modification of the stroke length during device operation or setup. Users can increase the offset for enhanced polishing effectiveness on tough surfaces, then reduce it for better control and reduced vibration on delicate work, making the device adaptable to different operational requirements
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
Enables users to customize the stroke of the machine according to their needs, enhancing control and efficiency in polishing and sanding operations, reducing the risk of damage and improving surface treatment outcomes.
Implementation Method 1
The stroke adjuster includes an adjuster ring and a cam mechanism secured to the adjuster ring. The counterweight engages the cam mechanism which moves the counterweight in response to cam movement.
Data Source
AI summary
An adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. At least one counterweight is movably disposed at least partially within the cavity. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the at least one counterweight with the mounting assembly. The stroke adjuster enables the at least one counterweight and mounting assembly to move with respect to one another such that a distance between the at least one counterweight and the mounting assembly may be variably adjusted which, in turn, variably adjust a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has an adjuster ring and a cam mechanism secured with the adjuster ring.