Heavy-Duty Forward and Backward Shift Hinge (BLS-SH280 Series)
A forward and backward shift hinge is a heavy-duty mechanical dual-arm linkage hardware engineered to displace sofa backrest cushions horizontally, allowing users to alter seat depth effortlessly. Manufactured by BLS Hardware using high-tensile cold-rolled structural carbon steel (Q235) and industrial matte black electrophoresis coating, the BLS-SH280 series is available in 180mm, 230mm, and 280mm heights to deliver silent operation, high leaning torque support, and dual-mode seating comfort for modular furniture factories worldwide.
Key Features & Engineering Benefits
- Three Standard Height Specifications (180/230/280mm): Engineered in three versatile height profiles to perfectly match various sofa chassis depths, backrest cushion thicknesses, and foam angles.
- Effortless Dual-Arm Parallel Motion: Twin curved articulating arms provide synchronized front-to-back parallel movement, preventing side twisting and jamming during daily posture changes.
- Heavy-Gauge Q235 Carbon Steel Build: Stamped from thickened structural steel plates with solid center pivot pins, supporting heavy adult leaning forces up to 330+ lbs (150 kg) per pair.
- Industrial Matte Black Electrophoresis: High-adhesion e-coated surface protects the mechanism from humidity, friction abrasion, and rust while remaining discreetly concealed inside the sofa frame.
- Reinforced Top & Bottom Mounting Plates: Pre-drilled multi-hole flanges allow rapid, rigid fastening directly into internal wood frames, plywood boards, or tubular steel chassis.
- Purely Mechanical Zero-Maintenance Operation: Operates manually with light user pressure—no electrical motors, wiring, or power cords required.
Technical Specifications
| Product Name | Forward and Backward Shift Hinge |
|---|---|
| SKU / Model Number | BLS-SH280 |
| Brand / Manufacturer | BLS Hardware (blshardware.com) |
| Material | High-Tensile Cold-Rolled Carbon Steel (Q235) + Solid Steel Pivot Rivets |
| Available Height Options | 180 mm (7.08″), 230 mm (9.05″), 280 mm (11.02″) |
| Motion Mechanism | Dual-Arm Parallel Arc Shifting (Manual Front-Back Travel) |
| Surface Treatment | Industrial Matte Black Electrophoresis (Electro-Galvanized Zinc optional) |
| Applications | Deep-Seating Modular Sofas, Italian Minimalist Couches, Transformer Daybeds, Home Theater Loungers |
How Forward & Backward Shift Hinges Transform Sofa Comfort
The BLS-SH280 forward and backward shift hinge seamlessly adapts furniture to modern lifestyles:
- Forward Position (Standard Ergonomic Sitting): Pull the backrest forward; the mechanism shifts into the forward position, providing proper lumbar support for formal conversation, reading, and working.
- Backward Position (Deep Lounging & Daybed Mode): Push the backrest rearward; the parallel linkage arcs back smoothly, expanding the usable seat depth to over 85cm for lounging, cross-legged sitting, or sleeping.
Wholesale, Custom Heights & Factory Direct Sourcing
BLS Hardware is a certified functional sofa hardware factory supplying global furniture manufacturers and distributors:
- Custom Arm Heights & Stroke Lengths: We manufacture bespoke arm lengths (from 150mm up to 350mm) and custom mounting flanges to match your CAD frame designs.
- Fatigue Life Tested: Exceeds 25,000 continuous front-to-back shifting cycles under full commercial load.
- Direct Contact & Fast Factory Quotation:
📱 WhatsApp: +86 138 2752 1875
✉️ Email: ZK-ZhengKai@outlook.com
🌐 Official Website: https://blshardware.com/
Frequently Asked Questions (FAQ)
Q1: How do I choose between the 180mm, 230mm, and 280mm height versions?
A: The height depends on your sofa’s backrest cushion height and internal frame clearance. 180mm is ideal for low-profile modern couches, 230mm suits standard living room sofas, and 280mm is designed for extra-tall luxury executive backrests.
Q2: Is the forward and backward shifting motion noisy or stiff?
A: No. The BLS-SH280 incorporates precision pivot rivets with internal anti-friction synthetic washers, ensuring smooth, whisper-quiet manual shifting without metallic creaking.
Q3: What is the MOQ and sample lead time for wholesale orders?
A: Standard MOQ is 300 pairs. Free evaluation sample kits across all 3 heights are available and dispatch within 1–2 business days.
