Automotive Manual Height-Adjustable Front Driver Seat Cushion Steel Frame Assembly

This manual seat cushion steel frame assembly is engineered specifically for front driver seats in passenger cars and commercial vehicles. Integrating a height-adjustment mechanism, heavy-duty tubular steel frame, and S-shaped spring suspension grid, it relies on a manual side lever mechanism to provide smooth vertical elevation adjustments. Designed to assemble with molded PU seat cushion foam and backrest frames, it allows drivers of varying heights to optimize their seating posture and driving field of view.

Parameter
Features

Main Cushion Frame	Q235 cold-rolled steel tubing, wall thickness 1.3 to 1.6 mm; Full immersion electro-coating anti-rust treatment; Neutral salt spray test 480 hours or higher, resisting corrosion in humid cabin environments.
S-Type Support Springs	65Mn high-carbon manganese spring steel wire, wire diameter 3.0 to 3.6 mm; Heat-treated, quenched, and tempered; High fatigue resistance and long-term tension retention without sagging.
Manual Adjustment Drive Mechanism	Thickened stamped steel plate with high-strength ratchet gear assembly; Quenched gear teeth for wear resistance and anti-stripping performance.
Vibration Buffer Sleeves	EPDM aging-resistant rubber material; Resistant to high and low temperatures and aging; Eliminates metal clashing noise.
Adjustment Travel & Method	Height adjustment stroke 30 to 60 mm with multi-position stepped locking; Side manual hand lever operation with 30 to 45 N operating force.
Locking Reliability	Zero automatic sinkage or gear slippage under full load seating conditions.
Durability Life	Cumulative height adjustment cycles 8000 or higher without slippage or mechanical failure.
Slide Rail Compatibility	Can be integrated with fore-aft seat slide rails; Height adjustment operates independently without interfering with fore-aft sliding motion.

Key Features & Selling Points:
- Corrosion-Resistant Structural Steel Frame: Built from electro-coated Q235 steel tubing (1.3 to 1.6 mm wall thickness) withstanding over 480 hours of neutral salt spray testing for long-term rust prevention.
- High-Fatigue S-Spring Grid: Features 65Mn high-carbon spring steel wires (3.0 to 3.6 mm diameter) to support full body weight without permanent deformation or sagging over time.
- Smooth Manual Height Adjustment: Operates via an ergonomic side lever requiring low operating effort (30 to 45 N) to deliver 30 to 60 mm of vertical elevation across multiple stepped locking positions.
- Fail-Safe Ratchet Locking: Utilizes heat-treated alloy ratchet gears to prevent gear stripping, automatic sinkage, or position slipping under full load conditions.
- Quiet & Independent Operation: Equipped with EPDM buffer sleeves to eliminate metallic noise, operating seamlessly alongside fore-aft slide rail mechanisms without interference.