9686 Office Chair Lesson Plan

The design of the '9686 Office Chair Lesson Plan' can integrate the structural characteristics of folding chairs with the framework of power machinery teaching, combining the needs of office scenarios with ergonomic principles to form the following teaching plan:

I. Teaching Objectives

1. Knowledge Objectives: Understand the application of triangular stable structures and quadrilateral folding mechanisms in office chair design, and grasp the impact of simple mechanical principles such as levers and wheel-and-axle systems on seat functionality.
2. Skill Objectives: Through model making (e.g., using LEGO 9686 sets or paper materials), practice constructing stable structures for folding chairs and implementing folding functions.
3. Application Objectives: Analyze office scenario needs (e.g., flexible seating in conference rooms, portability in rest areas) and optimize seat comfort through ergonomic design.

II. Core Content Design

1. Structural Stability Teaching

   • Triangular vs. Quadrilateral Comparison Experiment: Construct triangular and quadrilateral frames using A4 paper fixed with thumbtacks and tape, apply pressure to verify stability differences, and explain why office chairs use triangular supports (e.g., chair legs).
   • Parallelogram Folding Mechanism: Using the 'high-strength alloy frame + eco-friendly plastic seat' from the 9686 folding chair courseware as an example, analyze how the parallelogram structure enables smooth seat folding and unfolding, suitable for temporary seating needs in office spaces.

2. Integration of Power Machinery Principles

   • Lever Principle Application: Analyze the lever design in the armrest or backrest adjustment functions of office chairs, and demonstrate the relationships between the fulcrum, effort arm, and load arm through LEGO models.
   • Wheel-and-Axle and Pulley Optimization: If movable office chairs are involved, introduce wheel-and-axle structures (e.g., casters) to reduce friction or use pulley systems to achieve effort-saving seat height adjustments.

3. Office Scenario and Ergonomic Analysis

   • Scenario-Based Needs: Discuss the special requirements for seating in conference rooms, rest areas, etc. (e.g., quick storage, portability), and guide students to think about matching structural design with scenario functions.
   • Ergonomic Optimization: Combine functions such as lumbar support and seat depth adjustment in office chairs to explain how mechanical structures (e.g., adjustable levers) can adapt to users of different body types, enhancing comfort and health support.

III. Practical Session Suggestions

1. Model Making: In groups, use LEGO 9686 sets or paper materials to build folding chair models, focusing on implementing triangular support frames and parallelogram folding structures, and test stability and folding smoothness.
2. Function Expansion: Attempt to add adjustable backrests (lever principle) or wheel-and-axle movement devices to the models to simulate the dynamic functions of real office chairs.
3. Reflection and Improvement: Compare with actual office chair products (e.g., cases from the 9686 folding chair courseware), analyze the model's shortcomings in structural strength, folding efficiency, or ergonomics, and propose improvement plans.

IV. Teaching Evaluation Evaluate students' understanding of structural principles, practical operation skills, and insight into office scenario needs through model function testing, group presentations, and scenario application analysis.