Work Vehicle Operation Device Thumb Ergonomics
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Solution Overview
Problem
The operability of conventional work vehicle operation devices is not sufficiently improved, necessitating further enhancements for better functionality.
Innovation Solution
An operation device with a hold portion and an operation portion, featuring a finger rest and multiple operation switches arranged on an arc, where the finger rest is designed to facilitate easier access and rest for the operator's thumb, with a protrusion at the base end for ergonomic support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple operation switches are arranged on the operation portion, then the functionality and control capabilities are improved, but the complexity of the operation device increases
Solution Approach 1:
The operation switches are arranged in an arc shape on the operation portion, following the natural curvature of the thumb's movement path. This curved arrangement allows multiple switches to be accessed sequentially along the arc without increasing the overall device complexity, as the switches are integrated into the contoured surface of the operation portion.
Solution Approach 2:
The operation portion is designed with differentiated local characteristics: a flat region for mounting switches and a curved arc-shaped arrangement pattern. This local quality variation optimizes the placement of multiple switches to match the operator's thumb movement trajectory, enhancing control capabilities while maintaining a compact design.
2Ease of operation
If the finger rest is positioned to support the thumb, then the ease of operation is improved, but the space available for switch arrangement is reduced
Solution Approach 1:
The operation portion is segmented into distinct functional zones: a finger rest region for thumb support and an arc-shaped switch arrangement region. This segmentation allows the finger rest to occupy the central area while switches are distributed along the peripheral arc, ensuring both thumb comfort and adequate switch spacing without overlapping functions.
Solution Approach 2:
The switches are arranged in an arc that extends in a direction substantially orthogonal to the lengthwise direction of the hold portion. This dimensional arrangement allows the finger rest to support the thumb from below while switches are positioned along the curved path, effectively utilizing three-dimensional space to accommodate both functions.
3Ease of operation
If the operation switches are arranged in an arc, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The arc-shaped arrangement of operation switches follows a smooth curved path on the operation portion. This curvature is designed to match the natural arc of the thumb's movement, allowing the thumb to roll or slide along the curved surface to access different switches. The arc geometry simplifies the mechanical design compared to complex multi-axis positioning, as it relies on a single curved trajectory.
4Stability of the object's composition
If the minimum dimension of the finger rest is larger than the distance between switches, then the stability of thumb support is improved, but the overall size of the operation portion increases
Solution Approach 1:
The finger rest is designed with a minimum dimension in the widthwise direction that is optimized to provide stable thumb support. This local dimensional specification ensures the finger rest is wide enough to prevent thumb slippage while the arc-shaped switch arrangement efficiently utilizes the available space, minimizing the overall footprint of the operation portion.
Data Source
AI summary
An operation device includes a hold portion having a base end and a leading end, and an operation portion attached to the leading end of the hold portion. The operation portion includes a finger rest extending substantially along a direction in which the hold portion extends from the base end to the leading end, and first to third operation switches disposed with the finger rest interposed therebetween.