1. Introduction
The hjh OFFICE KID FLEX swivel chair is designed to adapt to the growth phases of children and teenagers, providing ergonomic support and comfort. This manual provides essential information for the safe assembly, operation, and maintenance of your chair.

2. Safety Information
Please read all safety instructions before using the chair to prevent injury or damage.
- Maximum Load Capacity: The maximum load capacity for this chair is 70 kg. Do not exceed this weight limit.
- Stable Surface: Always place the chair on a stable and level surface.
- Caster Brakes: The chair is equipped with load-dependent safety double casters. These casters brake automatically when the chair is unloaded to prevent unintentional rolling. They will roll freely when the chair is under load.
- Supervision: Children should be supervised when using the chair, especially during adjustments.
3. Setup (Assembly)
The hjh OFFICE KID FLEX chair requires assembly. While specific step-by-step instructions are typically included with the product packaging, the general process involves:
- Unpack all components and verify against the parts list provided in the box.
- Assemble the chair base and insert the casters.
- Insert the gas lift cylinder into the center of the base.
- Attach the seat and backrest assembly to the gas lift.
- Secure the footrest to the chair column.
Ensure all screws and connections are tightened securely before use. Do not overtighten.
4. Operating Instructions
The KID FLEX chair offers several adjustment options to ensure optimal comfort and ergonomic posture for growing users.
4.1. Seat Height Adjustment (Toplift)
- To raise the seat: Lift the lever located under the seat while taking your weight off the chair. The seat will rise automatically.
- To lower the seat: Lift the lever located under the seat while remaining seated. The seat will lower under your weight. Release the lever to lock the height.
4.2. Backrest and Seat Depth Adjustment
- The backrest and seat depth adjust simultaneously. Locate the handle positioned under the integrated armrests.
- To adjust: Pull the handle to move the backrest upwards and backwards, which also adjusts the seat depth. Release the handle to lock the position.
4.3. Footrest Height Adjustment
- The semi-circular footrest is height-adjustable.
- To adjust: Rotate the footrest slightly, then pull it upwards or push it downwards to the desired height. Ensure it clicks into place securely.

5. Maintenance
Proper maintenance ensures the longevity and continued performance of your hjh OFFICE KID FLEX chair.
- Cleaning: The fabric cover is robust and dirt-resistant. For general cleaning, wipe with a damp cloth. For stubborn stains, use a mild fabric cleaner according to the product instructions. Avoid harsh chemicals.
- Inspection: Periodically check all screws and connections to ensure they are tight. Retighten if necessary.
- Casters: Keep casters free of hair and debris to ensure smooth movement.
6. Troubleshooting
If you encounter issues with your chair, refer to the following common solutions:
- Chair does not roll: The casters are load-dependent and brake when the chair is unloaded. Ensure a user is seated on the chair for it to roll freely. Check for any obstructions (e.g., carpet edges, debris) around the casters.
- Adjustments are stiff or not working: Check for any obstructions in the adjustment mechanisms. Ensure levers are fully engaged or disengaged as required. If the gas lift is not functioning, contact customer support.
- Chair feels unstable: Verify that all assembly screws are securely tightened. Ensure the chair is on a flat, stable surface.
7. Specifications
| Feature | Specification |
|---|---|
| Model Name | KID FLEX |
| Model Number | 640490 |
| Overall Dimensions (H x W x D) | 80-93 cm x 53 cm x 60 cm |
| Seat Height | 43-50 cm |
| Seat Width | 43 cm |
| Seat Depth | 29-39 cm |
| Backrest Height | 37-43 cm |
| Armrest Height | 15-19 cm |
| Maximum Load Capacity | 70 kg |
| Recommended Body Height | 110-160 cm |
| Material (Seat) | Fabric |
| Material (Frame) | Plastic |
| Casters | Load-dependent safety double casters for carpets |
| Item Weight | 10.5 Kilograms |
| Country of Origin | China |
| Special Features | Adjustable armrest, Ergonomic, Height adjustable, Swivel, Footrest |

8. Warranty and Support
For information regarding warranty coverage, terms, and conditions, please refer to the documentation provided with your purchase or contact your retailer directly. For technical support or inquiries, please visit the official hjh OFFICE website or contact their customer service department.