Ergonomic Reclining Chair Design Specifications

This document outlines the design considerations and ergonomic parameters for reclining chairs intended for relaxation and managerial use.

1. Chair Positions and Usage

• The reclining chair is designed to accommodate individual measurements for optimal comfort.
• The relaxation position is not suitable for activities such as reading, watching television, or conversation.
• Relaxing chairs may benefit from a height-adjustable footrest.
• Backrests reclining more than 30° past vertical require an additional headrest for support.

2. Ergonomic Parameters and Dimensions

• Lumbar support depth ranges between 6-8 cm to 15-20 cm to maintain lordosis.
• Seat length maximum is approximately 508 mm, with a typical seat length around 406 mm.
• Reclining angles vary by chair type:
  • Relaxing chairs: reclining beyond 30° past vertical.
  • Operative chairs: reclining between 90° and 115° to support alertness and work requiring attention.
• Armrests and leg space are designed to facilitate ease of getting up, with armrests aiding movement and leg space accommodating thigh clearance.
• Footrests are recommended for shorter users, especially when table height is fixed.

3. Materials and Quality Considerations

• Material selection balances quality and price, with attention to warranty and upkeep.
• High-density padding is specified, with ischium thickness at 50 mm for comfort.
• Leather upholstery is mentioned as a material option.

4. Design and Functional Recommendations

• Chair design targets include ergonomics, ecology, upholstery, and finishing quality.
• Adjustable models are recommended to accommodate a range of user heights and preferences.
• Design must consider the plane of movement and reference planes of the seat for optimal posture support.

5. Additional Notes

• Relaxation positions have not been fully accounted for in anthropometric data, with a noted gender distribution of 99% men and 1% women in the data set.
• Table thickness and height parameters are considered in relation to chair design to ensure compatibility.

Summary: The document provides detailed ergonomic and design guidelines for reclining chairs, emphasizing individualized fit, appropriate reclining angles, lumbar support, and material quality to ensure comfort and functionality for relaxation and work-related seating.