Overlapping Operation Handles for Speed Changer Mechanisms
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Solution Overview
Problem
Conventional changeover operation devices for speed reducer mechanisms in electric rotary tools face difficulties in ease of use due to the need to maintain an intermediate position, leading to potential misalignment and increased complexity, which complicates the operation and increases the device's size.
Innovation Solution
A changeover operation device with overlapping operation handles that eliminate the need for an intermediate position, allowing for easier mode switching and reduced size, featuring distinct mode indicating portions and color-coded handles for enhanced usability and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single slide switch is used to control two shiftable gears, then the device complexity is reduced, but the ease of operation deteriorates due to the need to maintain an intermediate position
Solution Approach 1:
The patent divides the control function into two separate operation handles instead of using a single slide switch. Each handle independently controls one shiftable gear, eliminating the need for an intermediate position and making operation easier while maintaining acceptable device complexity
Solution Approach 2:
The patent arranges the two operation handles in an overlapping configuration within the same opening, utilizing spatial arrangement in multiple dimensions. This allows both handles to be operated independently without increasing the overall device footprint, resolving the contradiction between operational ease and device complexity
2Volume of moving object
If operation handles are arranged in an overlapping configuration, then the device size is reduced, but the ease of detecting and measuring deteriorates due to potential confusion between handles
Solution Approach 1:
The patent applies different visual characteristics (colors, patterns, or markings) to different portions of the operation handles. This allows users to easily distinguish between the handles and their respective functions even when arranged in an overlapping configuration, resolving the contradiction between compact size and detectability
Solution Approach 2:
The patent uses color coding or visual differentiation on the operation handles to make them easily distinguishable. This enables users to quickly identify the correct handle for each gear shifting operation without confusion, maintaining ease of detection despite the overlapping arrangement that reduces device size
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A changeover operation device, for changing over the positions of at least two components to establish three or more speed modes in a speed changer mechanism accommodated within a housing having an opening (95), includes operation handles (1,2) arranged in a corresponding relationship with the components. Each of the operation handles is movable between two specified positions along a specified operation direction to change over the positions of the components. The operation handles are continuously arranged within the opening of the housing, one of the operation handles being partially overlapped with the other.