Office Chair Leg Replacement

The method for replacing the legs of an office chair should be selected according to the specific type and extent of damage. Here are the detailed steps and precautions:

1. Footrest Replacement for Sihoo C Series (C300/C500)

If you need to replace the footrest of this type of office chair (the footrest is related to the chair leg structure), first prepare foam pads to protect the floor. Place the foam pads under the backrest to prevent scratches on the surface during disassembly. Use a screwdriver to remove the three screws securing the footrest, take off the old footrest, and then install the new component. This operation is only for the footrest part. If the main body of the chair leg is damaged, refer to other methods.

2. Plastic Chair Leg Replacement

When plastic chair legs are damaged, it is recommended to directly replace them with new ones. Ways to obtain replacement parts:

1. Contact the original merchant to inquire if they have spare parts of the same model;
2. Search for compatible alternatives on e-commerce platforms (make sure to confirm the size and interface type). Price reference: A single plastic leg costs about a few dozen yuan, and upgrading to an aluminum alloy material costs over a hundred yuan. Installation advice: Prioritize products with reliable quality. If you are not familiar with the operation, contact a professional repair shop for installation to avoid stability issues caused by improper installation.

3. Five-Star Base Disassembly and Replacement

The five-star base is the five-claw support structure at the bottom of an office chair. The replacement steps are as follows: Method 1 (Conventional Disassembly):

• Step on the fixed position of the five-star base with one foot and hold both sides of the seat cushion with both hands;
• Shake left and right and pull upwards, trying repeatedly for several times;
• If it is not loose, repeat the operation on the other two sides of the seat cushion until it is removed.

Method 2 (Tool-Assisted):

• Turn the chair upside down and check the bottom of the central column:
  • If there is a flat washer snap ring: Use a tool to remove the snap ring, take out the old five-star base, and then install the new one;
  • If there is no snap ring: The five-star base and the steel column form a conical press-fit structure. Use an iron hammer to lightly tap the edge of the five-star base to separate it from the steel column and then replace it.

4. Chair Leg Fracture Repair and Reinforcement

1. Minor Fracture Repair:

• Wooden chair legs: Clean the dust on the fracture surface, apply epoxy resin glue, and then fix it with clamps for 24 hours. After it is dry, sand the joint;
• Metal chair legs: Use welding or metal-specific AB glue for bonding, ensuring a flat connection surface.

2. Severe Fracture Reinforcement:

• Three-point reinforcement method: Wrap an iron sheet around the fracture, fix it with self-tapping screws; insert a long wood screw horizontally through the fracture; wrap a metal U-shaped fastener around it to enhance the load-bearing capacity;
• Metal tube sleeve reinforcement: Cut a 3cm diameter water pipe lengthwise, put it over the broken leg, and fix it with bolts (suitable for completely broken legs that touch the ground);
• Emergency reinforcement: Wrap the fracture with an old belt and fix it with a nail gun, or roll a magazine into a tube shape, put it over the broken end, and wrap it repeatedly with wide tape.

3. Replacement Advice: If the fracture is at a key stress point (such as the connection between the chair leg and the five-star base) or the damage is too severe, it is recommended to directly replace it with a chair leg of the same specification. Most furniture stores offer custom part services. You need to measure the size in advance and confirm the material.

Precautions: Ensure that the chair is in a stable state before operation to avoid secondary damage caused by shaking; if welding or complex reinforcement is involved, it is recommended to contact professionals for handling.