Ergonomic Workstation Linkages for Coordinated Sit-Stand-Recline Motion
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Solution Overview
Problem
Existing ergonomic workstations fail to provide coordinated and harmonized movement of chair, monitor, input devices, and work tray across a range of positions, including standing, sitting, and reclining, while maintaining optimal ergonomic relationships, and are often too expensive or luxurious in appearance for office settings.
Innovation Solution
An ergonomic workstation with adjustable task seat, monitor, and input device supports that utilize 4-bar mechanical linkages to align pivot axes with human body axes, allowing coordinated motion through various positions, including standing, sitting, and reclining, while maintaining a fixed eye-to-monitor distance and optimal ergonomic positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing ergonomic workstations provide coordinated movement of chair, monitor, and input devices, then ergonomic alignment is maintained, but cost increases and appearance becomes too luxurious for conventional office settings
Solution Approach 1:
The workstation is divided into independent adjustable components: a task seat with separate backrest and seat pan, a monitor support arm, and an input device support arm. Each component can be adjusted independently through mechanical linkages, providing coordinated movement without requiring a fully integrated expensive system. This segmentation allows for cost-effective manufacturing while maintaining ergonomic coordination.
Solution Approach 2:
The patent employs dynamic mechanical linkages (4-bar linkages) that automatically coordinate the movement of the monitor support and input device support as the seat position changes. This dynamic coordination maintains proper ergonomic relationships without requiring complex control systems or expensive automated mechanisms, making the system suitable for conventional office settings.
2Productivity
If users remain static in upright sitting posture, then simplicity is maintained, but repetitive motion injuries and fatigue increase
Solution Approach 1:
The workstation enables dynamic positioning through multiple adjustment mechanisms. Users can transition between upright sitting, reclined sitting, and standing positions while the mechanical linkages automatically coordinate monitor and input device positions. This dynamic capability reduces static posture fatigue and repetitive motion injuries while maintaining productivity.
Solution Approach 2:
The system allows users to change multiple ergonomic parameters simultaneously: seat height, backrest angle, monitor height and angle, and input device position. These parameter changes enable users to adapt the workstation to different tasks and time of day, reducing fatigue and injuries while maintaining high productivity levels.
3Ease of operation
If multiple workstation components are adjusted independently, then customization is improved, but coordination and harmonized movement are lost
Solution Approach 1:
Mechanical linkages serve as intermediaries between the seat position and the monitor/input device supports. These linkages automatically translate seat position changes into coordinated movements of other components, maintaining proper ergonomic relationships without requiring manual coordination by the user. This preserves adjustment flexibility while ensuring stable coordinated movement.
4Ease of operation
If ergonomic workstations are designed for extended comfort, then user comfort increases, but device complexity and cost increase
Solution Approach 1:
The ergonomic workstation is segmented into modular components: an adjustable task seat, monitor support, and input device support. Each component has its own adjustment mechanisms, allowing users to customize for comfort without requiring a single complex integrated system. This modular approach increases comfort while controlling overall device complexity.
Solution Approach 2:
The mechanical linkage system serves multiple functions: it coordinates monitor position, input device position, and maintains proper ergonomic relationships across different seating positions. This multi-functionality provides extended comfort through comprehensive adjustment capabilities without proportionally increasing device complexity.
Data Source
AI summary
An ergonomic workstation that includes a base; an effective hip axis affixed to the base; a seat bottom that rotates about the effective hip axis; a seat back that rotates about the effective hip axis; an effective shoulder axis positionally fixed to the seat back; an effective elbow axis positionally fixed to the seat back; a monitor support having a monitor mount that rotates about the shoulder axis; and an input device tray support configured such that an input device tray on the support rotates about the elbow axis. As the workstation moves through a broad range of operational zones, it maintains a fixed eye-to-monitor distance and fixed angle between the user's head and the monitor throughout a significant portion of the range of motion, and a fixed distance from the user's elbow to an input device throughout the entire range of motion.