Big Office Chair Teaching

Big office chair teaching focuses on core parameter adjustment and ergonomic adaptation, aiming to cultivate students' dynamic control ability over the relationship between 'human-chair-work surface'. The specific teaching framework is as follows:

1. Teaching Content Design: From Mechanical Operation to Ergonomics Teaching should break through traditional furniture perceptions and regard office chairs as dynamic mechanical interaction systems. The core modules include:

• Vertical Control of Pneumatic Lifting: Analyze the mechanical principles of the pneumatic rod and guide students to achieve precise matching between the seat height and the work surface height through the adjustment rod, ensuring a 90° natural bend of the elbow and reducing shoulder and neck pressure.
• Tension Feedback Mechanism of the Reclining Base: Combine physical lever principles to demonstrate the impact of base damping adjustment on sitting posture stability. For example, when reclining, tension adjustment is required to balance the body's center of gravity and avoid excessive lumbar lordosis.
• Physiological Curvature Fitting Technology of the Lumbar Support System: Use biomechanical models to analyze the S-shaped curvature of the spine and guide students to achieve precise fitting between the lumbar support point and the third and fourth lumbar vertebrae through height and depth adjustments of the lumbar support, dispersing intervertebral disc pressure.
• Three-Dimensional Positioning of Armrests and Seat Cushion Depth Adjustment: Use a three-dimensional coordinate system to position the height, angle, and front-back position of the armrests to ensure natural arm support; the seat cushion depth adjustment should cover two-thirds of the entire length of the thigh to avoid compressing the popliteal blood vessels.

2. Core Parameter Adjustment Practice: Establishing a Dynamic Mapping Relationship Strengthen the connection between parameters and healthy sitting postures through structured tasks:

• Pneumatic Lifting: Simulate seat height adjustments for users of different heights (e.g., 160cm and 180cm) to verify the standard of 'soles flat on the ground and thighs parallel to the ground'.
• Reclining Base: Set up a 30-minute continuous office scenario and guide students to gradually increase the reclining angle (recommended 5°-15°) according to fatigue, cooperating with tension adjustment to maintain body balance.
• Lumbar Support Adaptation: Use a lumbar support curvature demonstrator to compare the impact of flat support and dynamic fitting on lumbar pressure distribution, reinforcing the concept of 'the support point moving with changes in sitting posture'.
• Coordinated Adjustment of Armrests and Seat Cushion: Use an AR simulation system to show incorrect cases such as shoulder shrugging caused by overly high armrests and pelvic retroversion caused by overly shallow seat cushions, training students' comprehensive adjustment abilities.

3. Interdisciplinary Knowledge Integration: Resolving Cognitive Gaps

• Coupling of Physics and Biomechanics: Take the spinal load distribution model as an example to explain the principle that the intervertebral disc pressure is 40% lower when reclining at 110° compared to an upright sitting posture, guiding students to understand the biological significance of the reclining angle.
• Contextual Task Design: Design parameter adjustment plans for scenarios such as long-term typing and video conferencing. For example, during video conferencing, the height of the armrests needs to be lowered to cooperate with the arm holding the device, while increasing the lumbar support strength.

4. Teaching Tools and Resources: Combining Traditional and Digital Technologies

• Traditional Teaching Aids: Disassemblable seat models are used to dissect mechanical structures, pneumatic toolkits simulate the lifting process, and lumbar support demonstrators visualize curvature changes.
• Digital Technologies: AR systems dynamically display the impact of parameter adjustments on sitting postures, and online collaborative whiteboards support students in sharing adjustment plans and receiving real-time feedback.

5. Teaching Objectives: Cultivating Dynamic Adaptation Ability Through teaching, students should be able to:

• Understand the integration logic of ergonomics and mechanical systems;
• Master the 'human-chair-environment' adaptation principles, such as adjusting the lumbar support hardness according to work intensity;
• Have the ability to solve practical problems, such as customizing seat parameters for patients with lumbar disc herniation.