1. Introduction
Thank you for choosing the BOSMILLER Big and Tall Office Chair. This manual provides essential information for the safe assembly, operation, and maintenance of your new office chair. Please read these instructions carefully before assembly and retain them for future reference.
2. Important Safety Information
WARNING:
- Do not exceed the maximum weight recommendation of 400 lbs (181 kg). Exceeding this limit may result in personal injury or damage to the chair.
- Improper use of adjustable mechanisms may result in injury or malfunction of the chair. Always adjust mechanisms slowly and carefully.
- Improper assembly may result in personal injury or damage to the product. Ensure all parts are correctly installed and tightened according to the assembly instructions.
- Keep small parts away from children during assembly.
- Periodically check all bolts and screws to ensure they are tight.
3. Parts List
Before beginning assembly, verify that all components are present and undamaged. If any parts are missing or damaged, please contact customer support.
- Backrest
- Seat Cushion
- Armrests (2)
- Gas Lift Cylinder
- Base (5-star)
- Casters (5)
- Mechanism Plate
- Hardware (screws, washers, Allen wrench)
Image: Main view of the BOSMILLER Big and Tall Office Chair, illustrating its overall design and components.
4. Setup and Assembly Instructions
Follow these steps carefully for proper assembly. It is recommended to assemble the chair on a soft, clean surface to prevent damage.
- Attach Casters to Base: Insert each of the five casters into the holes at the end of each leg of the 5-star base. Push firmly until they click into place.
- Insert Gas Lift: Place the gas lift cylinder into the center hole of the assembled base.
- Attach Mechanism Plate to Seat: Align the mechanism plate with the screw holes on the underside of the seat cushion. Ensure the front of the mechanism (usually indicated by an arrow or "FRONT" label) faces the front of the seat. Secure with screws and washers using the provided Allen wrench.
- Attach Armrests to Seat: Attach the armrests to the sides of the seat cushion using the designated screws. Do not fully tighten yet.
- Attach Backrest to Seat and Armrests: Align the backrest with the seat and the armrests. Secure the backrest to the seat and the armrests using the remaining screws. Once all screws are in place, tighten all screws for the armrests and backrest securely.
- Connect Seat Assembly to Gas Lift: Carefully place the assembled seat (with mechanism, armrests, and backrest attached) onto the gas lift cylinder, ensuring the center hole of the mechanism plate aligns with the top of the gas lift.
Image: The BOSMILLER Office Chair fully assembled and positioned in a home office environment.
5. Operating Instructions
Your BOSMILLER office chair features several adjustable functions to enhance comfort and ergonomics.
5.1. Seat Height Adjustment
To adjust the seat height:
- To raise: While seated, lift the lever located under the right side of the seat. Stand up slightly to allow the chair to rise. Release the lever at the desired height.
- To lower: While seated, lift the lever located under the right side of the seat. Apply pressure to the seat to lower it. Release the lever at the desired height.
The adjustable height range is approximately 20.5 inches to 23.4 inches.
5.2. Rocking Function and Tilt Tension
The chair features a rocking mechanism for relaxation.
- To activate rocking: Pull the same lever (used for height adjustment) outwards from the chair. The chair will now allow you to rock back and forth between approximately 90-110 degrees.
- To lock upright: Push the lever inwards towards the chair.
- Adjusting Tilt Tension: The round knob located under the front-center of the seat controls the intensity of the rocking motion. Turn clockwise to increase tension (making it harder to rock) or counter-clockwise to decrease tension (making it easier to rock).
5.3. Flip-Up Armrests
The armrests are designed to flip up, allowing the chair to be pushed closer to a desk or for easier entry/exit.
- Simply lift the armrests upwards until they lock into an upright position.
- To return them to the down position, gently pull them down.
Image: Illustration of the space-saving flip-up armrests, demonstrating how they can be raised to tuck the chair under a desk.
Image: Detailed view of the chair's rocking function and seat height adjustment lever, with an arrow indicating the tilt tension knob.
6. Maintenance
Regular maintenance will prolong the life and appearance of your chair.
- Cleaning: Wipe clean with a damp cloth. For the PU leather, use a mild soap solution if necessary, then wipe dry. Avoid harsh chemicals or abrasive cleaners.
- Hardware Check: Periodically (every 3-6 months) check all screws and bolts to ensure they are tight. Re-tighten as needed to prevent wobbling or instability.
- Caster Care: Keep casters free of hair and debris to ensure smooth rolling.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair wobbles or feels unstable. | Loose screws or bolts. | Check and tighten all assembly screws and bolts. |
| Chair does not adjust height. | Gas lift malfunction or lever not engaged. | Ensure the height adjustment lever is fully engaged. If the problem persists, the gas lift may need replacement. Contact customer support. |
| Chair does not rock or rocks too easily/stiffly. | Tilt tension knob adjustment or rocking function not engaged. | Pull the lever outwards to enable rocking. Adjust the round tilt tension knob under the seat to increase or decrease rocking resistance. |
| Casters do not roll smoothly. | Debris caught in casters. | Remove any hair, dust, or debris from the caster wheels. |
8. Product Specifications
- Brand: BOSMILLER
- Model: B0BP1J189K
- Color: Black
- Material: Perforated PU Leather, High-Density Foam
- Maximum Weight Capacity: 400 lbs (181 kg)
- Overall Height: 45.7 - 48.6 inches
- Backrest Height: 25.2 inches
- Adjustable Seat Height: 20.5 - 23.4 inches
- Seat Depth: 18.5 inches
- Seat Width: 21.7 inches
- Back Width: 21.7 inches
- Special Features: Adjustable Height, Flip-Up Armrests, Ergonomic Design, Rocking Function with Tilt Tension Control, Wide Seat.
- Item Weight: 42.7 pounds
Image: Diagram illustrating the key dimensions of the BOSMILLER office chair, including seat height, seat depth, backrest height, and overall width.
9. Warranty and Customer Support
BOSMILLER is committed to providing quality products. For any questions, missing parts, or issues with your chair, please contact BOSMILLER customer support. Please have your model number (B0BP1J189K) and purchase information ready when contacting support.
Specific warranty details may vary by region and retailer. Please refer to your purchase documentation for precise warranty terms.