Cordless Spring System Overview for 38ZB Zebra Blinds

The 38ZB spring box is a dedicated in-tube spring module for cordless zebra blinds using 38 mm aluminum tubes.
It belongs to the R38 Cordless Spring System family, where 38RB modules are optimized for roller blinds and
38ZB modules are optimized for zebra (day & night) fabrics. Within this Cordless Spring System, each 38ZB module combines a low-friction POM outer shell with an internal 301 stainless-steel spiral spring that provides near constant lifting force across the stroke.

Internal Architecture: Shaft, Spring Boxes, Brake and Circlips

• Shaft – the “bamboo skewer” core: A precision R38 shaft runs through the center, but with a mechanical profile rather than a bamboo look. It defines the positions for each 38ZB spring box and the brake inside the Cordless Spring System.
• 38ZB spring boxes – the “hawthorns” on the stick: One or more 38ZB modules are threaded onto the shaft in series. Each module adds lifting capacity in the Cordless Spring System, just like adding another hawthorn on the skewer.
• Brake – the tail piece of the skewer: The Brake is central to the shade’s safe and graceful operation. It ensures the shade descends at a steady, elegant pace, preventing rapid falls and guaranteeing reliable performance.
• Circlips – the invisible stoppers: Once the spring boxes and brake are positioned, circlips are locked into the shaft grooves above and below the stack, fixing the positions and preventing movement during operation.
• Aluminum tube – the outer shell: The fully assembled spring set (shaft + 38ZB modules + brake + circlips) is then pushed into a Ø38 mm aluminum tube like a plug, creating a compact, sealed cordless lift core for zebra blinds within the Cordless Spring System.

There are two shaft versions in the R38 system: one designed to hold up to 2 pcs of 38ZB spring boxes, and one that can hold up to 5 pcs. The actual number of spring boxes used is selected according to the zebra fabric weight and bottom rail mass for each blind size.

Key Features & Benefits of the Cordless Spring System

Engineered for Zebra Fabrics

• Zebra-specific tuning: The 38ZB module is calibrated for the layered double fabric and typical weight distribution of zebra blinds, improving balance and hold at any position within the Cordless Spring System.
• Modular lift capacity: By combining 1–5 38ZB spring boxes on a single shaft, OEMs can cover a wide range of blind widths and drops without redesigning the mechanism.
• Consistent feel: The constant-force 301 stainless-steel spring delivers nearly uniform lift force, so the blind feels similar at the first pull and at full extension.

Quiet, Cordless Spring System User Experience

• No external cords or chains: The R38 38ZB Cordless Spring System supports fully cordless zebra blinds, reducing entanglement risks and eliminating bead-chain rattling.
• Low-friction POM housing: The POM shell provides self-lubricating contact surfaces, reducing internal friction and helping to keep the lift motion smooth and quiet.
• Brake and damping integration: The R38 brake and controlled spring release help avoid “snap-up” behavior.

OEM-Friendly Platform

• Standardized R38 platform: Share the same shaft, brake and circlip logic between 38RB and 38ZB variants; only the spring box type changes between roller and zebra programs in the Cordless Spring System.
• Inventory simplification: Two shaft types (2-spring and 5-spring) plus a defined set of 38ZB modules allow you to cover most zebra blind SKUs with fewer mechanism SKUs.
• Ready for automation and volume: The sealed module design and clear assembly steps are suitable for high-volume production lines and automated pressing equipment.

Application Scenarios

• Premium living rooms and bedrooms: Smooth, quiet Cordless Spring System zebra blinds that match modern interior design.
• Nursery and family spaces: No exposed cords; compliant, child-friendly hardware when paired with suitable headrails and components.
• Offices and hospitality: Unified R38 platform for large projects that require consistent operation across many windows.
• Smart-ready programs: The same R38 mechanical core can be combined with suitable tubular motors in hybrid designs, sharing the load and improving motor life.

Installation & Fabrication Notes for Cordless Spring System Zebra Blind Manufacturers

• Step 1 – Confirm tube and blind specs: Use Ø38 mm tubes and calculate total load (fabric + bottom rail) for the target zebra blind size.
• Step 2 – Select shaft type: Choose the 2-spring shaft for lighter, smaller blinds or the 5-spring shaft for wider, heavier blinds or denser fabrics.
• Step 3 – Decide the number of 38ZB modules: Based on load charts and your key SKUs, configure the shaft with the appropriate number of 38ZB spring boxes to balance the blind without over-pulling.
• Step 4 – Assemble the spring pack: Thread the 38ZB modules onto the shaft “in series”, add the R38 brake at the tail, then lock their positions using the specified circlip grooves.
• Step 5 – Insert into the tube: Push the assembled spring shaft into the aluminum tube like a plug, mount the corresponding end caps, and integrate into your zebra blind headrail.
• Step 6 – Pre-tension and test: Apply the recommended number of pre-tension turns, cycle the blind several times, and fine-tune pre-tension to achieve stable stop at any height.

FAQ

Q1: Can the 38ZB Cordless Spring System be used for roller blinds?
A1: No. The 38ZB spring box in the Cordless Spring System is tuned for zebra (day & night) fabrics. For roller blinds, DOSRON provides the matching 38RB spring box within the same R38 platform.

Q2: How do I decide how many 38ZB spring boxes to use?
A2: Selection is based on zebra fabric weight, bottom rail mass and blind size. The R38 Cordless Spring System offers shafts for up to 2 or 5 spring boxes; your final configuration should follow DOSRON’s load chart and your key SKUs.

Q3: Is the Cordless Spring System child-safe?
A3: The R38 Cordless Spring System eliminates external lift cords and chains at the user interface, helping brands design child-safe cordless zebra blinds. Final compliance still depends on the complete blind design and local regulations.

Q4: Can DOSRON customize the Cordless Spring System for my zebra blind range?
A4: Yes. DOSRON can adjust spring specification, pre-tension range and shaft configuration within the Cordless Spring System to match your target fabric weights, sizes and market requirements for OEM/ODM projects.

Q5: Can I combine the Cordless Spring System with a tubular motor?
A5: The 38ZB Cordless Spring System can be used in hybrid spring + motor architectures, where the spring shares the lifting load with a tubular motor to reduce torque demand and improve motor life.

Q6: What maintenance does the 38ZB Cordless Spring System require?
A6: The 38ZB spring box is a sealed POM module and normally does not require lubrication in use. Routine checks should focus on the overall blind: tube connection, end caps, brackets and correct pre-tension settings.

Child-Safe Window Covering Solutions for Cordless Blinds & Shades

What Are Child-Safe Window Covering Solutions?

Child-safe window covering solutions are window blinds and shades engineered to eliminate or control hazardous cords and loops. Instead of relying on long pull cords or beaded chains, they use cordless lift systems, secured tension devices or integrated motor drives so that children and pets cannot become entangled during everyday use.

The DOSRON platform focuses on three core goals: remove exposed operating cords wherever possible, control inner cords so they cannot form dangerous loops, and keep operation intuitive and comfortable for end users so safety does not come at the cost of usability.

DOSRON Child-Safe Platform Overview

1. Cordless Spring Systems for Roller, Zebra & Honeycomb Blinds

For most applications, the first choice is a fully cordless spring system. DOSRON in-tube spring modules balance the blind weight so users can simply push or pull the bottom rail to raise or lower the blind. There are no free-hanging chains or cords on the front of the blind, helping OEM brands convert a large share of their range to child-safe designs with minimal redesign of tubes and brackets.

2. Hybrid Spring + Motor Solutions

Where projects demand remote control or smart-home integration, DOSRON offers hybrid spring + motor architectures. A constant-force spring shares the load with a compact tubular motor, reducing the torque requirement and helping extend motor life while keeping the system quiet and responsive. This allows brands to offer corded-free motorized blinds that remain child-safe at the point of use.

3. Safe Chain Clutch & Tension Device Kits

For SKUs where a looped chain is still required, DOSRON supplies custom clutch systems with compliant tension devices. These kits are designed so that the loop is permanently secured and tensioned, in line with the expectations of ANSI/WCMA and CPSC rules for continuous loops, and can be combined with clear installer guidance and labels for retail or project markets.

4. Inner Cord Management for Venetian & Roman Blinds

DOSRON also supports inner cord and ladder tape safety for faux-wood Venetians and Roman shades by aligning lift components, cord routings and headrail hardware so that inner cords cannot be pulled out to form hazardous loops. Combined with cordless or wand-based tilt options, this gives OEMs a full toolkit to upgrade classic Venetian and Roman collections to child-safe configurations.

Key Features & Benefits

• Cordless by design – Primary solutions remove front-side chains and cords completely, greatly reducing entanglement risk for children and pets.
• Compliance-oriented engineering – Mechanisms and recommended usage scenarios are designed to support ANSI/WCMA A100.1-2022, CPSC 16 CFR 1260 and EN 13120 cord-safety requirements in target markets.
• Multiple form factors – Mechanisms for roller blinds, zebra blinds, honeycomb shades, faux-wood Venetian blinds and fabric Romans, allowing a portfolio-wide child-safe strategy.
• Quiet, smooth operation – Constant-force springs, POM housings and guided damping help minimize noise and bounce for a premium user experience in bedrooms, nurseries and offices.
• Installer-friendly – Drop-in spring modules and motor cores are designed around standard tube sizes and familiar assembly steps, reducing training time for fabricators and installers.
• Scalable for OEMs – A modular platform lets brands standardize on a small number of cores and tune pre-tension or accessories for different fabrics, widths and drops.
• Branding-ready hardware – Selected visible parts, such as end caps and brackets, can be offered with private-label logo options for brand differentiation at retail.

Technical Specifications (Platform Overview)

Typical Tubular Motor Options for Hybrid Child-Safe Systems

For hybrid and fully motorized child-safe blinds, DOSRON integrates compact DT25 series tubular motors with built-in lithium batteries, matched to constant-force spring modules to lower torque demand and extend system life.:contentReference[oaicite:0]{index=0}

Application Scenarios

• Family homes and apartments – Living rooms, bedrooms and balconies where parents want a clean look and peace of mind with no hanging cords.
• Nurseries and kids’ rooms – Blackout roller or honeycomb blinds with cordless or hybrid operation to support safe sleep and quiet naps.
• Schools and childcare facilities – Classrooms, reading corners and common areas where regulations and inspections focus on child safety.
• Healthcare and hospitality – Hospitals, clinics and hotels that require easy-to-clean, safe, low-noise blinds for patient and guest comfort.
• Retail and showrooms – Display windows and fitting rooms where retailers need compliant, robust blinds that withstand frequent operation.

Installation & Integration Guidelines

For Cordless Spring Blinds

• Confirm blind type, tube size (for example Ø32 or Ø38 mm) and target width × drop × fabric mass.
• Select the DOSRON cordless spring unit model that matches the weight range and application (roller, zebra, honeycomb, Roman).
• Cut the tube to size, fix the fabric, then insert the spring unit and matching idler or adaptor at each end.
• Mount standard brackets, adjust pre-tension and verify that the blind holds position at mid-height without drifting.

For Hybrid Spring + Motor Systems

• Define the required control method: handheld remote, wall switch or smart-home integration via gateway.
• Select a DT25 series motor and compatible spring unit according to tube size and load band.
• Assemble motor and spring in the same tube, pair the remote, set upper and lower limits, then fine-tune learning positions for everyday use.
• Provide clear user instructions on cordless operation and battery charging where applicable.

Safety & Compliance Considerations

• Eliminate long free-hanging cords on the majority of stock and custom products by using cordless or hybrid solutions wherever technically feasible.
• Use tension devices on continuous loops that cannot be made cordless, and mount them at the correct height in line with WCMA and CPSC requirements.
• Control inner cords and ladders so they cannot be drawn out to form hazardous loops, especially in Venetian and Roman systems.
• Align packaging, labels and IFUs (Instructions for Use) with target market regulations, making the child-safe features visible and easy to understand.
• Work with accredited labs where needed to validate that finished products meet the latest test methods and documentation requirements.

OEM / ODM Services for Brands & Fabricators

• System design support – Help mapping fabrics, tube sizes and target blind sizes to suitable cordless or hybrid mechanisms.
• Custom spring and motor tuning – Adjust torque curves, pre-tension and damping for different markets and user preferences.
• Private-label options – Branding on visible components and documentation to support premium or volume retail programs.
• Technical documentation – Assembly guides, selection charts and basic marketing copy to accelerate product launches.
• Long-term platform roadmap – Consistent hardware platform that can evolve with new regulations and smart-home trends without redesigning every SKU from zero.

What Is the L11 Cordless Spring Mechanism for Fabric Roman Shade?

The L11 Cordless Spring Mechanism is DOSRON’s dedicated platform for turning classic fabric Roman shades into modern cordless products. The core component is the L11 Spring Box, which replaces traditional cord locks and cleats with an internal constant-force spring and cord drum hidden inside the headrail. Together with the 1″ Cord Bases, it keeps lift cords inside the headrail and fabric instead of hanging in front of the window.

In a standard layout, one L11 Spring Box is fixed to the shade headrail. The lift cord is wound inside the box and exits from both sides. These two cord runs pass through a pair of 1″ Cord Bases installed in square cut-outs on the headrail, then drop down behind the fabric, through sewn pockets or rings and finally attach to the bottom rail. From the user’s point of view, there are no hanging cords or chains – only a clean fabric panel and a bottom rail that can be positioned smoothly at any height.

Inside the L11 Spring Box: Materials and Construction

The L11 Spring Box is engineered as a sealed, service-friendly module that can be integrated into OEM Roman shade headrails with minimal design changes.

• Housing: Low-friction POM (acetal) or equivalent engineering plastic, designed as a closed box to protect the constant-force spring and cord drum from dust and contamination.
• Constant-force spring: Stainless-steel strip (e.g. 301 grade) formed into a constant-force coil that delivers nearly flat torque over the full lifting stroke of the shade.
• Cord drum: Precisely sized drum guiding the lift cord turns so that winding and unwinding remain controlled, avoiding sudden jumps or slack.
• Dual cord exits: Two cord exits at both ends of the L11 Spring Box, creating a symmetric double-cord layout to keep the bottom rail level and stable.

By combining a constant-force spring with a sealed housing and guided cord path, the L11 Spring Box acts as a compact “engine” that provides a stable lifting force and a cleaner user interface than traditional corded Roman systems.

1″ Cord Base: Guiding the Cord and Locking Position in the Headrail

While the L11 Spring Box is the core product, the 1″ Cord Base is the key supporting part that stabilises the cord path and secures the mechanism to the headrail. Together they form the complete L11 Cordless Spring Mechanism.

• Headrail integration: Two square holes are punched or milled into the headrail on both sides of the L11 Spring Box. The Cord Bases snap or screw into these holes, locking their position relative to the box.
• Cord guidance: The cord exits the Spring Box, passes through the Cord Bases and then turns downward underneath the headrail.
• Load transfer: Each Cord Base helps distribute forces from the moving cord into the headrail, reducing side loads on the L11 Spring Box housing and improving long-term stability.
• Assembly efficiency: In production, installers mount the L11 Spring Box, insert the Cord Bases into the pre-made openings and thread the cord through. This repeatable process is suitable for high-volume OEM lines.

How the L11 Cordless Spring Mechanism Operates in a Roman Shade

The complete system is designed around a simple user action – moving the bottom rail – while all the work is done inside the headrail.

1. The L11 Spring Box is fixed near the centre of the headrail with screws or integrated clips.
2. The lift cord is wound around the internal drum and exits from both ends of the L11 Spring Box.
3. On each side, the cord passes through a 1″ Cord Base mounted in a square opening in the headrail and then exits underneath the headrail.
4. From there, the cord runs downward behind the fabric, passing through rings or sewn channels until it reaches the bottom of the shade.
5. At the bottom, the cord is secured using cord retainers or knots inside the bottom rail so that the entire fabric panel and bottom rail hang from the L11 Cordless Spring Mechanism.
6. When the user lifts the bottom rail, the constant-force spring in the L11 Spring Box winds in cord and raises the shade. When they pull the bottom rail down, the spring unwinds in a controlled way, allowing smooth, balanced descent.

At no point does the user need to handle exposed lift cords. The visible interface is a clean fabric Roman shade and a bottom rail that moves quietly and predictably.

Key Features and Benefits of the L11 Cordless Spring Mechanism

• Cordless user interface: No external pull cords or beaded chains at the front of the shade; the Cordless Spring Mechanism is fully hidden inside the headrail and fabric.
• Smoother lift feel: The constant-force spring in the L11 Spring Box helps neutralise fabric and bottom rail weight so the shade feels lighter and easier to position.
• Stable intermediate positions: Properly matched spring torque and cord routing through the Cord Bases allow the Roman shade to stay at the height where the user leaves it.
• Cleaner visual design: By removing front cords and cleats, attention returns to the fabric and sewing details instead of hardware.
• Child-safer architecture: Internal lift cords reduce accessible cord hazards at the user side and support modern expectations for child-safe window coverings.
• OEM-friendly platform: The L11 Spring Box and Cord Bases can be adapted to existing headrail programs with simple hole patterns and mounting interfaces.

Technical Specifications for the L11 Cordless Spring Mechanism

Typical Application Scenarios

The L11 Cordless Spring Mechanism is designed for daily-use residential and light-commercial environments where a cordless Roman shade offers a clear upgrade in both safety and appearance.

• Bedrooms and children’s rooms: Soft fabric Roman shades with a cordless interface that reduces cord hazards and keeps the view clean.
• Living rooms and lofts: Decorative Roman shades where the mechanism must support heavier fabrics without feeling stiff or noisy.
• Hotels and serviced apartments: Guest-facing windows where easy operation, reduced maintenance and a premium look are all important.
• Boutiques and showrooms: Display windows using Roman shades as part of the interior design language, with no visible cords to distract from the products.

OEM / ODM Integration for L11 Spring Box Programs

DOSRON works with Roman shade manufacturers and brand owners to adapt the L11 Cordless Spring Mechanism to their existing headrail and fabric standards.

• Headrail adaptation: Review of current headrail drawings and recommendation of hole patterns and mounting details for the L11 Spring Box and Cord Bases.
• Spring tuning: Selection of torque levels and pre-tension windows around your main fabric SKUs, widths and drops.
• Assembly guidance: Suggested sewing, threading and balancing procedures to keep line setup simple and repeatable.
• Documentation support: Drawings and basic performance data to support internal quality files and safety documentation.

About DOSRON Cordless Mechanisms

DOSRON specialises in spring-based cordless mechanisms and motor platforms for modern window coverings. The L11 Spring Box and Cord Base system for fabric Roman shades sits alongside DOSRON solutions for roller, zebra and Venetian blinds, allowing OEM partners to build complete cordless collections on a consistent engineering philosophy.

With a focus on practical installation, stable supply and repeatable quality, DOSRON acts as a long-term partner for brands upgrading from traditional corded systems to safer and more refined cordless products.

FAQ for the L11 Cordless Spring Mechanism

Q1: What is the main difference between the L11 system and a traditional corded Roman shade?

A1: Traditional systems rely on exposed cord locks and free-hanging cords at the front of the shade. The L11 Cordless Spring Mechanism uses an internal L11 Spring Box and 1″ Cord Bases inside the headrail so that users only touch the bottom rail, not the lift cords.

Q2: Can I use one L11 Spring Box on all Roman shade sizes?

A2: One L11 Spring Box covers a typical residential window range, but best results come from matching the spring torque and pre-tension to your main sizes. For very wide or heavy shades, DOSRON can recommend stronger springs or multi-module layouts.

Q3: Do I need to redesign my headrail to use the L11 Cordless Spring Mechanism?

A3: In many cases you can keep your existing headrail profile and simply add mounting points and square openings for the L11 Spring Box and 1″ Cord Bases. DOSRON can review your current design and propose a practical interface.

Q4: How does the L11 Cordless Spring Mechanism help with safety expectations?

A4: By moving lift cords inside the headrail and fabric and removing exposed operating cords, the L11 architecture aligns with modern expectations for child-safer, cordless window coverings at the user interface.

Q5: Is field adjustment possible if the Roman shade feels slightly over-balanced or under-balanced?

A5: Yes. Within the recommended range, installers can fine-tune cord attachment points and follow DOSRON’s guidance for pre-tension settings so that the shade feels natural to operate and holds position correctly.

Cordless Blind Mechanisms Manufacturer for OEM Window Coverings

Who We Are – Cordless Blind Mechanisms Manufacturer for OEM Brands

DOSRON focuses on the engineering and production of cordless blind mechanisms for global OEM / ODM partners.
Instead of selling finished blinds, we manufacture the core hardware that makes modern cordless blinds possible:
in-tube springs, lift modules, brakes, mounting interfaces and related components.

Whether you are upgrading from traditional chain-operated roller blinds or launching a new
cordless blind collection, our mechanisms are designed to fit directly into your existing tube and headrail platforms,
reducing re-tooling cost while improving child safety, acoustic comfort and user experience.

What Is a Cordless Blind Mechanism?

A cordless blind mechanism replaces exposed lift cords and chains with an internal mechanism that lets users
lift and lower the blind by touching the bottom rail or fabric. Inside the tube or headrail, a combination of
constant-force spring, brake and shaft provides the lifting force and holds the blind in position.

• Constant-force spring core: Stainless-steel spring strip wound inside a compact module, providing nearly flat lifting force across the full stroke.
• Brake / friction control: Internal brake or damping structure that prevents the blind from snapping up too fast and holds it at the desired height.
• Tube / headrail interface: Adaptors and shafts that connect the mechanism to your existing aluminum tubes or headrail profiles.
• Bottom rail interaction: The user gently pushes or pulls the bottom rail to raise or lower the blind – no chains, no hanging cords.

Compared with traditional corded systems, a well-designed cordless mechanism delivers safer operation for children and pets,
a cleaner appearance and a noticeably quieter movement during everyday use.

DOSRON Cordless Blind Mechanism Families

As a cordless blind mechanisms manufacturer, DOSRON offers several mechanism families to cover different
blind types and tube sizes.

1. Cordless Spring Units for Roller & Zebra Blinds

• Tube sizes: Compatible with Ø25 / Ø28 / Ø32 / Ø38 mm aluminum tubes.
• Balance range: Configurable for approx. 1 – 8 kg fabric and bottom rail loads (model-dependent).
• Applications: Light-filtering roller blinds, blackout roller blinds, day & night zebra blinds.
• Key benefits: Smooth cordless lifting, reduced bounce, cleaner front view with no chain.

2. Cordless Lift Mechanisms for Faux-Wood & Aluminum Venetian Blinds

• Use case: Replace cord locks and cord ladders with an internal spring-lift core while keeping tilt function.
• Blind sizes: Typical widths from 600 – 2400 mm, heights from 1000 – 2500 mm.
• Lift feel: “Zero-gravity” style lift for slat stacks when raising and lowering the blind.
• Child safety: No front lift cords, supporting compliance with modern blind safety standards.

3. Cordless Honeycomb & Cellular Blind Mechanisms

• Top-down / bottom-up options: Spring-balanced systems for standard lift and top-down bottom-up configurations.
• Profile compatibility: Adaptable to common honeycomb rail designs with custom carriers and sliders.
• Comfort: Soft, controlled movement suitable for bedrooms and nurseries.

4. Hybrid Spring + Motor Mechanisms

• Architecture: The spring unit shares the load with a low-voltage tubular motor.
• Advantages: Lower motor torque requirement, extended battery life, quieter start / stop.
• Scenarios: Smart-home roller blinds where cordless manual and motorized options share the same platform.

Key Features & Benefits for OEM Manufacturers

2.1 Child-Safe Cordless Design

• No exposed lift cords or chains on the front of the blind, helping reduce strangulation risk for children and pets.
• Support for safety documentation: Engineering data and drawings to assist with compliance files and retailer requirements.
• Clear product segmentation: Use cordless mechanisms for nursery, kids’ room and family-focused SKUs while keeping clutched or motorized options in other channels.

2.2 Quiet, Smooth Operation

• Constant-force spring curve to minimize jerky movement and hard impacts at the top.
• POM guidance and internal damping to reduce friction noise inside the tube or headrail.
• Balanced lifting so users feel light, consistent pull from fully closed to fully open position.

2.3 Modular Platform, Fewer SKUs

• Shared components across roller, zebra and honeycomb ranges where possible.
• Adjustable pre-tension so installers can fine-tune lift performance without changing the core mechanism.
• Custom adaptors to fit your existing tubes and rails, avoiding a complete system redesign.

2.4 Customization Options from the Manufacturer

• Tube size & torque: Mechanism options for Ø25 / Ø28 / Ø32 / Ø38 mm tubes and different load ranges.
• Spring spec: Stainless-steel spring thickness, width and pre-tension can be tuned for your key fabric SKUs.
• Visible colors: White, black, grey and project-specific colors for exposed parts such as end caps or brackets.
• Branding: Discreet private-label logo options on visible components.

Technical Snapshot – Typical Cordless Mechanism Parameters

The table below shows a typical parameter window for DOSRON cordless mechanisms. Model codes and exact values are customized
according to tube profile, blind size and target market.

*Values above are reference ranges. Final selection should follow your own load calculations, profile design and safety requirements.

Typical Application Scenarios

• Family homes & nurseries: Cordless blackout blinds for bedrooms and baby rooms where visible cords are not acceptable.
• Modern apartments & condos: Clean, minimal blinds with no chains to disturb the façade or interior design.
• Hospitality & serviced apartments: Robust cordless systems that are easy for guests to use and hard to misuse.
• Education & healthcare: Safer, low-maintenance blinds in classrooms, training rooms, clinics and waiting areas.
• Retail private-label programs: Upgrade corded ranges to cordless while keeping existing tube and rail systems.

Integration with Other DOSRON Systems

Cordless mechanisms are one part of DOSRON’s hardware ecosystem. OEM brands can build full product ladders using
related systems on the same platform.

• Cordless spring unit device: For in-tube spring lift cores in roller and zebra blinds –
  see cordless spring unit device.
• Hybrid spring + motor kits: For blinds that need both manual cordless lift and motorized tilt or automation –
  see hybrid cordless spring and motor kits.
• Battery tubular motors: For smart-home and premium channels where automation is required –
  see battery tubular motor systems.

By standardizing on a common DOSRON platform, you can keep child-safe cordless, clutched and motorized blinds
in one coherent hardware family.

OEM / ODM Support from the Manufacturer

• Engineering consultation: Tube / rail drawings, load estimates and mechanism selection for your key blind sizes.
• Sampling & pilot runs: Pre-production kits for lab testing, internal validation and first project roll-outs.
• Customization: Spring specs, visible colors and mounting interfaces tuned to your brand and regional standards.
• Documentation: Basic safety instructions, installer guides and adjustment procedures for field teams.
• Long-term cooperation: Continuous optimization based on feedback from your production lines and installers.

Custom Window Blind Clutch Systems for OEM Roller Blinds

What Is a Custom Window Blind Clutch System?

A window blind clutch system is the mechanical core that transfers the user’s pull on a
beaded chain into controlled rotation of the blind tube. Instead of relying on friction only, the clutch
uses internal gears and pawls to:

• Lift and lower the blind fabric smoothly and predictably.
• Hold the blind at any height without drifting down.
• Manage load from different fabric weights and sizes.

DOSRON designs custom window blind clutch systems as a family of drop-in modules. OEM partners can match clutch
spec (tube size, gear ratio, chain type and mounting style) to each SKU, while keeping a unified look and shared components
across the whole collection.

Key Features of DOSRON Custom Window Blind Clutch Systems

2.1 Engineering Core

• High-precision gear train: Optimized tooth profile for low backlash, smoother pull and reduced noise.
• POM & reinforced nylon housing: Low-friction, wear-resistant polymers for long service life in daily use.
• Steel drive shaft: Ensures torsional rigidity on wider blinds and heavier fabrics.
• Positive locking mechanism: Holds the tube securely to prevent creeping or sudden drops.

2.2 Customization Options for OEM Programs

• Tube compatibility: Modules for Ø25 / Ø28 / Ø32 / Ø38 mm aluminum tubes.
• Gear ratios: Multiple ratios (e.g. 1:1 / 1:1.5 / 1:2 / 1:3) to balance pull force and speed.
• Chain choices: Plastic or metal chains, different pitches and colors, ready for global markets.
• Bracket interface: Clip-in or screw-fix options to match your existing headrail and mounting style.
• Branding options: Discreet logo placement on end caps or brackets for private-label programs.

2.3 Performance & User Experience

• Stable pull force: Optimized gearing keeps chain tension light but consistent across the blind travel.
• Quiet operation: Guided contact surfaces and polymer damping reduce mechanical noise during lifting.
• Smooth stacking: Even fabric roll-up to protect fabric edges and minimize telescoping.
• Wide size coverage: Models available for compact shades and large picture windows.

Technical Specifications

The table below shows typical parameters for DOSRON custom window blind clutch systems. Values can be tuned based
on your tube profile, fabric type and target markets.

*Values above are reference ranges. Final selection should follow your own load calculations, tube design and safety requirements.

Safety & Compliance Considerations

While clutched blinds still use a chain, a well-designed system helps OEM brands meet modern child-safety expectations
and local regulations:

• Chain tensioners & guides to keep the chain fixed to the wall and reduce strangulation risk.
• Controlled pull force through correct gear ratio, avoiding excessive resistance for elderly or children.
• Stable locking to prevent accidental free-fall of the blind when the chain is released.
• Compatibility with cordless upgrade paths (e.g. spring-assisted cordless systems) for higher-risk SKUs.

DOSRON supports OEM partners with data sheets and guidance so clutched blinds can coexist with cordless and
motorized ranges in a single, safety-first portfolio.

Typical Application Scenarios

• Residential roller blinds: Living rooms, bedrooms and home offices using light-filtering or blackout fabrics.
• Office & commercial spaces: Open-plan offices, meeting rooms, training rooms with standardized window modules.
• Retail & hospitality: Hotels, serviced apartments and shops that need robust, easy-to-service hardware.
• Project and contract markets: Large roll-outs where stable quality and easy replacement are critical.

Integration with Cordless & Motorized Systems

Many brands run mixed hardware strategies by market and price level. DOSRON clutch systems are designed to sit
alongside other DOSRON platforms:

• Cordless spring units: For nurseries and family-focused ranges, upgrade to
  cordless spring lift systems with no front chain at all.
• Tubular motor upgrades: Use the same tube profiles with
  battery tubular motors for smart-home or premium channels.
• Hybrid collections: Offer clutched blinds as the entry level, cordless as mid-tier, and motorized as top tier –
  all built around related components to simplify supply chain and training.

OEM / ODM Support for Clutch-Based Blind Programs

DOSRON works with blind manufacturers, fabricators and brand owners to turn
custom window blind clutch systems into complete product programs:

• Engineering support: Tube drawings, bracket interfaces and load estimates for your key fabric SKUs.
• Sample & pilot runs: Pre-production kits for lab testing and first store sets.
• Custom colors: White, black, grey and project-specific colors for visible parts.
• Documentation: Assembly guides, installer sheets and basic safety instructions.
• Packaging options: Bulk industrial packing or retail-ready packing for DIY markets.

Hybrid Cordless Spring and Motor Kit for Venetian Blinds 

1. What Is the DOSRON Hybrid Cordless Spring and Motor Kit for Venetian Blinds?

The DOSRON Hybrid cordless spring and motor kit for Venetian blinds is a modular drive system that hides both a spring-balanced lift unit and a compact
motor module inside the headrail. Users can lift or lower the blind by hand for everyday “grab-and-go” control, or trigger the motor via remote, wall switch, or smart-home hub.
If power is low or offline, the constant-force spring still supports the slat stack, so the blind remains comfortable to use instead of becoming “dead weight”.

For OEM and private-label brands, this platform turns a single headrail architecture into multiple SKUs: manual cordless, hybrid spring + motor, and
even motor-only programs — without re-engineering the entire product line.

2. Why Venetian Blind Brands Choose DOSRON’s Hybrid Platform

• True cordless interface: No pull cords or chains at the window, supporting global child-safety expectations and reducing strangulation risk.
• Spring-balanced comfort: Constant-force spring unit offsets the slat weight, so the blind feels light and controlled in manual operation.
• Motorized convenience: Integrated motor drive delivers one-touch or scheduled operation for smart-home projects.
• Fail-safe usability: If the battery is low or power supply is disconnected, users can still operate the blind by hand.
• Extended motor life: The spring absorbs part of the load, helping reduce motor torque demand and supporting longer service life.
• Flexible SKU strategy: Same headrail and accessory family for faux-wood Venetians, aluminum blinds, and composite slats.
• DOSRON engineering support: Co-development of spring specs, motor selection, and headrail tooling for different markets and weight ranges.

3. Inside the System: How Spring and Motor Work Together

3.1 Spring Unit – The Passive “Muscle”

The cordless spring unit is a sealed module using a constant-force stainless-steel spring and POM housing. It provides nearly flat lifting force over the full stroke,
helping the blind stay in place at any height while minimizing bounce and impact noise.

• Material: 301 stainless-steel spring strip & low-friction POM casing.
• Function: Offsets 50–80% of slat stack weight (tuned by spring spec and pre-tension).
• Comfort: Smooth lift with reduced “jerk” when users start or stop movement.
• Noise control: Internal guides and damping design support quiet operation in bedrooms and offices.

3.2 Motor Module – The Active “Brain”

The motor module is based on DOSRON’s DT25 low-voltage tubular motor platform with integrated lithium battery and multi-channel remote pairing. Typical models operate at
5 V DC, with rated power around 5 W, speed in the 25–28 rpm range and torque in the 0.4–0.7 Nm class, depending on configuration.:contentReference[oaicite:0]{index=0}

• Battery capacity options: Approx. 2600 mAh or 5200 mAh integrated Li-ion pack.
• Control modes: Hand-held remote, wall-mounted transmitter, or third-party gateway integration.
• Travel learning: Electronic upper/lower limit and “favorite” position setting via remote.
• Protection: Low-battery indication, stall detection, and internal electronics protection.

3.3 Hybrid Logic – Who Does What?

In a Hybrid cordless spring and motor kit for Venetian blinds, the spring handles the base lifting effort while the motor provides direction and fine speed control:

• Manual mode: User lifts the bottom rail; spring supports the weight; motor is idle.
• Motor mode: Motor drives the drum with spring assistance, reducing peak torque demand.
• Power-off mode: System reverts to “smart manual” cordless operation instead of locking the blind.

4. Typical Applications for DOSRON Hybrid Venetian Systems

DOSRON designed this hybrid kit for OEMs serving mid-to-high-end residential and light commercial projects where both aesthetics and function matter:

• Faux-wood Venetian blinds in family living rooms, bedrooms, and nurseries.
• Aluminum Venetians for home offices, study rooms, and small commercial spaces.
• Hospitality & serviced apartments needing cordless safety with motorized comfort.
• Smart-home upgrade packages sold through dealers and installers.
• Retail private-label programs that want to migrate from cord-lock to cordless and motor-ready SKUs.

5. Core Technical Specifications (Indicative Range)

Final specifications of the DOSRON Hybrid cordless spring and motor kit for Venetian blinds are tuned per project. The table below shows a typical design window used by many OEM partners:

*Values above are indicative. DOSRON will confirm detailed specifications and test results according to your headrail design, slat material, and target market.

6. System Components in the DOSRON Hybrid Kit

A typical DOSRON Hybrid cordless spring and motor kit for Venetian blinds includes:

• Cordless spring unit: Sealed constant-force spring module with pre-tension options.
• Battery motor module: DT25-based low-voltage motor with integrated control and limit-setting.
• Drive drum & adapters: Interfaces between motor/spring and your ladder tape & lift tape system.
• Headrail brackets & end-caps: Compatible with standard Venetian blind profiles (custom tooling optional).
• Remote control / wall transmitter: Multi-channel control with group and favorite positions.
• Cables / charging accessories: USB Type-C cable, optional power adapter or solar panel.

DOSRON can also supply tilt mechanisms, wands, and Venetian blind accessories for a complete bill of materials.

7. Child Safety, Standards, and Market Positioning

Because the interface is 100% cordless, DOSRON’s hybrid kit supports retailers and brands working to align with North American and European child-safety requirements for window coverings.
Your marketing teams can confidently position hybrid Venetian blinds as:

• “No visible cords” solutions for families with children and pets.
• Future-ready for evolving regulations that restrict exposed pull cords and chains.
• Premium comfort products that are quiet, smooth, and easy to use every day.

8. OEM / ODM Options with DOSRON

As a component specialist, DOSRON works directly with fabricators, headrail extruders, and brand owners. Typical cooperation steps:

1. Review your target blind sizes, slat materials, and market (US, EU, or others).
2. Select an appropriate spring spec and motor torque / battery option.
3. Match the headrail profile and design adapters or brackets if needed.
4. Run sample builds and cycle tests before mass production.
5. Provide assembly guides and marketing support for your launch.

If you are upgrading from classic cord-lock Venetian blinds, DOSRON can help you map the old SKUs to new cordless spring-only and Hybrid cordless spring and motor kit SKUs, reducing confusion for dealers.

9. FAQ: Hybrid Cordless Spring & Motor Kit for Venetian Blinds

Q1: Is the hybrid system safe for children’s rooms?

Yes. There are no exposed lift cords or chains at the window. The blind is operated by hand on the bottom rail or via remote control, aligning with child-safety expectations in key markets.

Q2: What happens if the battery is empty?

The blind remains manually operable because the constant-force spring still supports the slat weight. Users can continue to move the blind until the motor is recharged.

Q3: Can I offer both manual cordless and hybrid in the same program?

Yes. Many OEM partners use the same DOSRON headrail platform and simply add or remove the motor module to create different price levels: cordless spring-only, hybrid spring + motor, or motor-only.

Q4: Which slat types are compatible?

The kit is suitable for faux-wood, composite, and aluminum slats. DOSRON will help tune spring and motor specs according to slat weight and ladder tape layout.

Q5: How many blinds can one remote control?

DOSRON multi-channel remotes typically support up to 15 channels plus an “all” channel, giving dealers flexible grouping for rooms and open-plan spaces.

10. Start Your Hybrid Venetian Project with DOSRON

If you are planning to upgrade corded Venetian blinds to a cordless, child-safe, and hybrid motor-ready line, the
DOSRON Hybrid cordless spring and motor kit for Venetian blinds gives you a practical platform to move quickly — without re-inventing your entire headrail system.

Contact DOSRON’s engineering and sales team to discuss:

• Target blind sizes and weight ranges.
• Spring and motor configuration for your market.
• Sample kits and pilot projects.
• Branding and packaging options for private-label programs.

DOSRON helps you turn quiet, cordless technology into a clear market advantage — one Venetian blind at a time.