Office Chair Teaching

Office chair teaching mainly covers four aspects: structural principles, functional adjustments, adaptability exploration, and teaching implementation.

I. Structure and Ergonomic Principles
The core components of an office chair include the backrest, seat cushion, armrests, and five-star base. The backrest design should conform to the natural curve of the lumbar spine, providing dynamic support to distribute pressure evenly. The seat cushion must meet the fit standards for seat height (45-55cm) and seat depth (40-48cm) to avoid compressing the blood vessels at the back of the thighs. The armrests should support vertical (5-10cm) and horizontal (3-5cm) adjustments, as well as 360-degree rotation, to adapt to different work scenarios. The five-star base must be made of high-strength materials (such as nylon or steel) to ensure stability. Ergonomic principles emphasize designs that reduce prolonged sitting fatigue and prevent spinal diseases through lumbar support curves and reclining mechanical balance.

II. Functional Adjustment Teaching

1. Armrest Adjustment: Vertical movement is achieved through side buttons or knobs. Horizontal sliding requires a gentle push on the front of the armrest, and rotation is accomplished via the central axis of the armrest surface, adapting to different heights and operating postures.
2. Reclining Adjustment:
   • Unlocking Function: Pulling down the handle on the right side allows the backrest to recline freely to 120-135 degrees.
   • Tension Adjustment: Turning the cylindrical knob on the base clockwise increases the rebound force (suitable for heavier individuals) and counterclockwise decreases it (suitable for lighter individuals).
   • Angle Locking: Pulling out the control lever on the right side of the seat cushion and pushing it back when reclined to a comfortable angle (e.g., 110 degrees) locks the position.
   • Returning to Upright Position: Pulling out the control lever and gently pushing the backrest allows the chair to return to the upright position, then pushing the lever back locks it.

III. Adaptability Exploration
Through case studies (e.g., differences in backrest height requirements for users of different body types) and parameter measurements (e.g., matching seat depth with thigh length), master adaptability assessment methods. For example, users under 170cm in height are recommended to choose chairs with a seat depth of ≤42cm to avoid leg suspension due to excessive seat depth.

IV. Teaching Preparation and Implementation

1. Teaching Preparation: Use structural disassembly models to display internal mechanical structures, accompanied by spinal physiological curvature demonstration boards to explain design logic. Utilize 3D modeling software to simulate pressure distribution under different adjustment states and collect student feedback through online collaboration platforms.
2. Teaching Implementation: Introduce the topic with the context of "causes of prolonged sitting fatigue," guiding students to analyze design flaws by combining prior knowledge (e.g., human skeletal structure) and deepening understanding through practical adjustment tasks.