Adjustable Joystick Thumb Switch for Forestry Control Ergonomics
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Solution Overview
Problem
Operators of forestry machinery face ergonomic challenges and repetitive strain injuries due to the need for unergonomic hand positions and movements when using existing control surfaces with fixed thumb switch positions, leading to fatigue and reduced control precision.
Innovation Solution
A height-adjustable thumb button or z-switch integrated into the joystick handle, allowing operators to customize the control surface to their individual physical dimensions, reducing strain and improving tactile feedback for more precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thumb button position is fixed on the joystick handle, then the control surface structure is simple, but the operator experiences ergonomic problems and fatigue during extended use
Solution Approach 1:
The thumb button is made adjustable in height along the joystick handle, transforming a static component into a dynamic one that can adapt to different operator needs. The button can be repositioned vertically to accommodate various hand sizes and operating positions, resolving the contradiction between operational comfort and structural simplicity.
Solution Approach 2:
The height position of the thumb button is changed as a variable parameter rather than being fixed. By allowing the button position to be adjusted along the joystick handle, the system adapts to different ergonomic requirements without fundamentally changing the overall control surface structure.
2Adaptability or versatility
If the operator uses base panel buttons with vertical hand orientation, then all functions can be accessed, but the hand must perform extreme ulnar deviation causing fatigue and pain
Solution Approach 1:
The control interface is extended from the horizontal base panel to the vertical dimension of the joystick handle. By placing buttons on the joystick handle in addition to the base panel, the system provides another dimension for control input, allowing operators to access functions without extreme hand deviations.
Solution Approach 2:
The hand orientation is made dynamic rather than fixed. Operators can switch between vertical hand orientation (using joystick buttons) and horizontal orientation (using base panel buttons) depending on the task, eliminating the need for repeated extreme ulnar deviations.
3Productivity
If more buttons are placed on the joystick for hybrid use, then cognitive load is reduced, but the thumb position on z-switch affects control precision
Solution Approach 1:
The thumb button position on the joystick handle is made adjustable to optimize the angle and distance between the thumb and the z-switch. This dynamic adjustment allows operators to maintain precise control while using multiple buttons for efficient operation.
Solution Approach 2:
The joystick handle is given special local quality with adjustable buttons positioned according to ergonomic principles. This localized adaptation ensures that the thumb's interaction with both the buttons and z-switch maintains optimal precision while supporting high-speed operation.
Data Source
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AI summary
The invention is a control surface (10), adapted for the use in a forest machine, having a base panel (20), the base panel (20) comprising multiple buttons and/or switches to be used with an operators hand, having a joystick (30) protruding from the base panel (20), the joystick (30) comprising a handle part (31). The handle part (31) has multiple buttons and/or switches to be used with an operator's hand, the handle part (31) having a thumb button/switch (32) to be used by an operator's thumb, the thumb button (32) being adjustable in the height position in relation to the base.