Power Tool Control Assembly With Uniform Detent Force
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Solution Overview
Problem
Existing power tool control assemblies require increasingly more force to rotate through operational positions due to the design of the detent mechanism, making it difficult for users to smoothly transition between forward and reverse modes.
Innovation Solution
A control assembly with a sliding carriage member and a detent assembly that includes a force compensation mechanism, where the detent recesses are varied in shape, size, depth, width, curvature, or surface texture to maintain a uniform force requirement for rotational position changes, and a switch module that includes a 'Normally Open' intermediate position for added safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detent mechanism is used to provide controlled movement of the control assembly, then the control assembly provides discrete operational positions, but the force required to rotate the control lever becomes increasingly difficult
Solution Approach 1:
The detent recesses are designed with varying parameters including depth, width, curvature, and surface texture. Specifically, the detent recesses have progressively deeper engagement depths and varying curvatures along the rotational path, which compensates for the increasing rotational force required by maintaining more uniform detent engagement forces throughout the rotation range.
2Reliability
If the detent recesses are made deeper to improve detent engagement, then the detent mechanism provides more secure positioning, but the force required to move between positions increases
Solution Approach 1:
Each detent recess is designed with local variations in quality including different depths, widths, and curvatures tailored to the specific rotational position. The detent recesses have progressively deeper engagement depths and varying curvatures along the rotational path, which compensates for the increasing rotational force required while maintaining secure positioning at each discrete position.
Data Source
AI summary
A control assembly for use with an electrical device to control operation of the electrical device in a plurality of operational modes.