Assembly and Disassembly of Adjustable Office Chairs

The assembly and disassembly of adjustable office chairs should be carried out according to standardized procedures to ensure safety and the integrity of components. Here are the specific assembly and disassembly steps:

I. Disassembly Steps

1. Tool Preparation
   You will need a rubber mallet (to avoid damaging the paint with a metal hammer), a Phillips screwdriver, an adjustable wrench, needle-nose pliers or vise grips; for stubborn components, you may need pipe wrenches (for turning stuck gas cylinders), lubricant (WD-40 or cooking oil for rusted parts); if disassembling the gas cylinder, it is recommended to use a dedicated gas cylinder removal tool; wear gloves to prevent slipping and scratches during operation, and wear safety goggles if necessary to prevent parts from flying.

2. Separating the Base (Five-Star Foot) from the Gas Cylinder

   • Invert the chair so that the five-star foot with wheels is facing upwards.
   • Observe the connection point between the center of the base and the gas cylinder (usually a tightly fitted plug-in structure).
   • Use a rubber mallet to evenly tap around the metal base or steel ring at the connection point, avoiding single-point tapping; at the same time, use your hands or feet to assist in掰动 (掰动 can be translated as 'prying' or 'twisting' in this context, but '掰动' is more of a Chinese colloquial term for applying force to separate; here, '掰' implies a twisting or prying motion, so 'twist/pry' could be used, but for simplicity, 'assist in掰动' is translated as 'assist in掰掰/twisting/prying') or踩住 (step on) the five-star foot to form a combined 'tap-twist/pry' force, repeating the operation until the gas cylinder separates.

3. Separating the Seat Cushion (Upper Seat) from the Gas Cylinder

   • Removing the Base Plate: Use a screwdriver to remove the fixing screws of the plastic or metal base plate at the bottom of the seat cushion, and take off the base plate to expose the connection structure.
   • Selecting the Separation Method:
     • Tapping Method: Use a rubber mallet to tap the metal base plate at the connection point between the bottom of the seat cushion and the gas cylinder, hold the gas cylinder steady with one hand, and tap with the other hand (or step on the chair with your foot for support), using vibration to loosen the two parts.
     • Shaking Method: Raise the gas cylinder to its highest point, hold the seat cushion with one hand, press the height adjustment lever with the other hand to release the lock, and shake the seat cushion vigorously from side to side several times.

4. Disassembling Other Components

   • Removing the Base Plate: Hold the chair upside down with one hand and tap the base plate position with a rubber mallet (if no rubber mallet is available, use an iron hammer with a towel wrapped around it for tapping).
   • Removing the Gas Cylinder: Invert the chair and tap the bottom of the gas cylinder flatly with the side of a hammer (avoid tapping the middle button; if the button is higher than the bottom of the gas cylinder, stop the operation).
   • Removing the Wheels: Simply pull them out forcefully.

II. Assembly Steps

1. Understanding the Structure
   Follow the reverse order of disassembly, paying special attention to the assembly logic of the backrest, seat, and wheels.

2. Assembling Components

   • Sort and place the components to avoid confusion.
   • Remove the screws at the back of the office chair and install the upper tray.
   • Directly snap the wheels into the five-wheel positions.
   • Place the pressure rod and snap on the upper tray to complete the basic assembly.

3. Adjusting Comfort
   Adjust the height up and down through the gas rod to ensure comfort. The lifting rod is designed in an inverted cone shape, and it is directly plugged in during installation without the need for screws or welding; when disassembling, raise the gas rod to its highest point and lightly tap around the base plate with a hammer (avoid prolonged tapping at a single point); older chairs may require slightly more force.