OEM cordless spring unit device for window blind manufacturers
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The OEM cordless spring unit device for window blind manufacturers is designed as a
drop-in lift core for modern cordless programs. Instead of stocking different mechanisms for each line,
OEM brands can standardize on one constant-force platform and tune it by pre-tension and spring spec.
- Constant-force spring balance: 301 stainless-steel coil maintains nearly constant lifting force over the full stroke for smooth, “zero-gravity” handling.
- Compact sealed module: Enclosed POM housing lowers friction and blocks dust, making it suitable for high-volume OEM production and automated assembly lines.
- Multi-tube compatibility: Adapters allow integration with Ø25 / Ø28 / Ø32 / Ø38 mm roller tubes and headrail designs.
- Child-safe cordless design: Lift cords and chains are eliminated at the user interface, supporting compliance with North American and European cord-safety requirements.
- Adjustable pre-tension: Installers can add or remove turns to match local fabrics and bottom rails without changing the core mechanism.
- Quiet operation: Guided friction and internal damping cut bounce and impact noise, protecting brand perception in premium markets.
Technical Specifications – OEM Cordless Spring Unit Device
The figures below are typical engineering targets for the OEM cordless spring unit device for window blind manufacturers.
Final values can be tuned per project.
| Parameter | Value | Notes |
|---|---|---|
| Spring material | 301 stainless steel, 0.11–0.15 mm thickness | Corrosion-resistant, high fatigue life |
| Housing material | POM (acetal) engineering plastic | Self-lubricating, low friction, stable dimensions |
| Rated shade weight range | 1.0–4.5 kg per lift side (≈ 2.2–9.9 lb) | Depending on fabric, tube size and rail design |
| Recommended shade width | 600–2600 mm | Single module; wider spans can use dual units |
| Cycle life | ≥15,000 cycles at rated load | For normal residential applications |
| Noise level | ≤40 dB at nominal speed | Measured at 1 m in typical test rig |
| Operating temperature | 0–40 °C | Indoor use only |
| Tube compatibility | Ø25 / Ø28 / Ø32 / Ø38 mm | Via modular adapters for different programs |
| Holding torque stability | ±8 % across working stroke | For consistent “hover at any height” feel |
Compatible Window Blind Types & Programs
The same OEM cordless spring unit device can support multiple SKUs and price tiers by
changing only the external hardware and fabric. This helps window blind manufacturers simplify inventory.
1. Cordless Roller Shades
- Blackout roller shades for bedrooms, nurseries and media rooms.
- Light-filtering fabrics for living rooms, dining rooms and offices.
- Day–night dual roller combinations using paired modules.
2. Cordless Zebra / Dual Shades
- Layered “day and night” fabrics where precise hover and slow motion are critical.
- Suitable for mid-width zebra shades with bottom weight bars and valances.
3. Roman & Fabric Shades
- Flat Roman shades with guided tapes or ladders.
- Soft fabric shades where smooth motion prevents jerks and wrinkles.
4. Hybrid Spring + Motor Concepts
- Pre-balance the panel weight with the spring unit; use a compact DC motor only for positioning.
- Reduce motor size, noise and battery consumption in smart-home lines.
Assembly & Pre-Tension Workflow for OEM Fabricators
The device is designed for efficient, repeatable processing on the factory floor. Below is a typical
workflow for roller and zebra shade programs.
- Select the spring spec: Choose the torque band based on target fabric weight, shade width and bottom rail mass.
- Mount into tube or headrail: Insert the spring unit into the designated end of the tube/headrail using the matched adapter and bearing support.
- Set initial pre-tension: Apply the recommended number of turns (for example, 6–10 pre-turns) according to the width × drop chart.
- Hang the shade panel: Attach fabric, bottom rail and any fascia or cassette components.
- Fine-tune on test rack: Lift and lower the blind 3–5 times; add or remove ½–1 turn as needed until the blind hovers smoothly at mid-height.
- Quality check: Confirm max speed, noise level, and hover stability fit the program’s target feel before packing.
For high-volume OEM partners, DOSRON can provide pre-tension charts, torque-curve samples and
assembly checkpoints so that production teams can maintain a consistent user feel across regions and batches.
OEM & ODM Support for Window Blind Manufacturers
This OEM cordless spring unit device for window blind manufacturers is part of a wider component
ecosystem built for brands that need predictable performance and long-term support.
- Project-based torque selection: Share width × drop ranges, fabric GSM and rail type; we recommend the matching spring spec and pre-tension window.
- Custom housings & adapters: Tailored end-cap geometries, colors and mounting schemes to fit your existing headrails and tubes.
- Co-branded documentation: Install guides, care labels and safety cards aligned with your brand language and local regulations.
- Validation & testing support: Cycle testing, hover drift checks and torque sampling to document performance for major retailers or importers.
- Scalable production: Batch traceability for each spring spec and housing lot to support long-term supply and quality assurance.
