Dual-Mode Motorization Kit for Cordless Spring-Lift Roller Blinds

1. System Overview – Inside the Dual-Mode Motorization Kit

The Dual-Mode Motorization Kit is designed specifically for cordless spring-lift roller blinds. Instead of choosing between a purely manual spring system or a purely motorized blind, this kit integrates both into a single,in-tube architecture:

• Left side: A compact battery tubular motor plugs into the tube like a cork, with only a narrow drive head exposed.
• Right side: A DOSRON constant-force spring box plugs into the opposite end in the same way.
• Middle: Fabric is bonded to the aluminum tube and rolled around it; no lift cords or bead chains are visible.

In manual mode, the spring balances the blind’s weight so the user can raise or lower it by hand, keeping the cordless blind feel. In motorized mode, the tubular motor drives the tube directly, while the spring still offsets the load, reducing torque demand and improving acoustic comfort.

The kit is available for two mainstream tube diameters — Ø32 mm and Ø38 mm — making it compatible with most roller blind systems already in use in global markets.

2. Materials & Core Components

2.1 In-Tube Battery Tubular Motor

At the heart of the Motorization Kit is a slim, low-voltage tubular motor from the DOSRON DT25 family, engineered
for quiet, controlled movement and long battery life. Typical models offer:

• Battery capacity: 2,600 mAh or 5,200 mAh lithium battery packs for 6–9 months of normal use per charge.
• Charging voltage: 5 V DC via USB-Type-C or dedicated adapter.
• Rated power: around 5 W for energy-efficient daily operation.
• Speed & torque: approx. 25–28 rpm and 0.4–0.7 Nm torque depending on model.
• Protection class: IP20 for indoor blind applications, with operating temperature from 0–40 °C.

These parameters are based on the standard DT25B1/B2 product line, tested and validated for roller blind use.

2.2 Constant-Force Spring Box (Spring-Lift Core)

On the opposite side of the tube, the constant-force spring box delivers the classic DOSRON “zero-gravity” lift:

• Spring strip: 301 stainless-steel constant-force spring wound into a compact coil.
• Housing: Low-friction POM box, sealed to keep dust out and to stabilize the spring’s path.
• Diameter families: R32 and R38 spring boxes, tuned to match Ø32 mm and Ø38 mm tubes.
• Variants: Multiple spring strengths within each diameter to cover different fabric weights and bottom rails.

The spring box adds lift assistance and damping, helping the blind stay at any height with minimal bounce and without the“snapping” feel of traditional coil springs.

2.3 Aluminum Roller Tube & Mounting Hardware

The Motorization Kit is optimized around standard roller blind hardware:

• Tube options: 6063-T5 aluminum tubes in Ø32 mm and Ø38 mm.
• End-caps & adapters: Motor head, spring plug, and idle end caps designed to lock into OEM brackets.
• Brackets: Metal or high-strength plastic brackets for wall, ceiling or frame mounting.
• Bottom rail: Cordless bottom rail designed for manual lifting, with optional soft-touch or child-safe profile.

For OEMs, all these elements can be branded, color-matched, or customized while keeping the functional geometry consistent with DOSRON’s spring and motor modules.

2.4 Electronics, Remote & Smart Controls

The Motorization Kit connects to a range of DOSRON control options:

• Handheld remote: Multi-channel remotes control up to 15 blinds, with dedicated UP / DOWN / STOP keys.
• On-motor key: R1 or similar key for pairing, power on/off and limit setting during installation.
• Gateways & apps: Optional Zigbee / Wi-Fi gateways integrate the blinds into smart-home ecosystems.
• Solar or plug-in charger: USB-C or DC jack for periodic recharging of the in-tube battery.

3. Architecture & Durability – How the Kit Is Built

From the outside, a blind built on this kit looks like a clean, cordless roller blind: a slim headrail or exposed tube, a
flat fabric panel, and a bottom rail. All complexity is hidden inside the tube.

3.1 Plug-In Motor & Spring – “Two Wine Stoppers” Layout

The mechanical layout is intentionally simple:

• Motor side (left): The tubular motor is inserted into the aluminum tube until its drive wheel engages the tube’s
  inner profile. The motor’s body disappears into the tube; only the drive head and a slim collar remain visible at the end.
• Spring side (right): The constant-force spring module is inserted like a second cork from the opposite end, with its
  torque output shaft keyed into the tube.
• Tube middle: Fabric is bonded to the tube and rolled around it, storing the blind panel and providing a clean
  surface when raised.

Because both motor and spring are fully in-tube, the headrail retains a minimalist profile and the blind remains truly
cordless on the room side — no chains, no dangling cords, and no visible clutch.

3.2 Load Sharing & Quiet Operation

One of the biggest advantages of combining a spring-lift core with a tubular motor is load sharing:

• The spring offsets a large portion of the fabric and bottom-rail weight.
• The motor supplies the remaining torque needed to move the blind.
• Because the motor never “fights” full weight alone, noise and stress are reduced.

This means:

• Quieter blinds: Less strain on gears and bearings, fewer harsh starts and stops.
• Longer motor life: Motors running under partial load stay cooler and last longer.
• Smoother feel: When users choose manual lift, the spring provides that “easy, balanced” motion.

3.3 Durability & Life Cycle

The Motorization Kit inherits DOSRON’s design standards for cycle life:

• Spring modules: Designed for high cycle counts under repeated lift-lower operations.
• Motors: Built on proven DT25 hardware with consistent performance across thousands of cycles. :contentReference[oaicite:1]{index=1}
• Housings & plastics: POM and engineering plastics selected for wear and impact resistance.

For OEM programs, DOSRON can provide cycle-life data and testing methods so you can integrate this kit into retailer or project-spec requirements.

4. Capacity & Use Scenarios – Where the Motorization Kit Fits

The Dual-Mode Motorization Kit is ideal wherever you need a blind that behaves like a modern cordless product, but also offers motorized convenience:

• Bedrooms & nurseries: Smooth, quiet lift with no bead chain, plus remote control for early mornings or nap times.
• Living rooms & media rooms: Large roller blinds operated from the sofa, with the option of manual adjustment.
• Home offices: Frequent small adjustments via hand or remote to manage glare on screens.
• Hospitality & serviced apartments: Simple, intuitive operation for guests—tap the bottom rail or press a button.
• Light commercial: Conference rooms, small offices, and boutique spaces that need quiet, discreet blinds.

Because the kit supports both Ø32 mm and Ø38 mm tubes, OEMs can match it to a wide span of blind sizes, from lighter daylight fabrics to heavier blackout materials, without overcomplicating the hardware list.

5. System Layout – How the Motorization Kit Works from End to End

5.1 In-Tube Layout

From left to right, a typical blind built on this kit looks like this internally:

1. Left bracket & motor head: Supports the motor and provides drive connection to the tube.
2. Battery tubular motor: Housed fully inside the tube, with charging port either on the head or via pigtail cable.
3. Aluminum tube: Rotates as the motor drives or as the user lifts/lower manually.
4. Fabric panel: Bonded and rolled on the tube, forming the visible blind.
5. Constant-force spring box: Seated in the right end of the tube, pre-tensioned to match the blind load.
6. Right bracket: Receives the spring shaft and locks the assembly into the frame.
7. Bottom rail: User interface for manual lift — grasp and gently move up or down.

5.2 Control Logic – Manual First, Motor When Needed

The Dual-Mode Motorization Kit is designed so that manual cordless operation remains the default behaviour:

• Users can always move the blind by touching the bottom rail, even if they ignore the remote.
• The spring holds the blind in position when the user lets go, just like a traditional cordless spring-lift blind.
• When the remote is used, the motor rotates the tube while the spring keeps the system balanced.

This approach keeps the system intuitive for anyone who walks into the room, while premium buyers still get the comfort of motorization and smart-home integration.

5.3 Safety Logic & Limits

Standard DOSRON motors support:

• Top & bottom limit positions: Installer-set stops to protect fabric and hardware.
• Optional “learning” positions: Intermediate preset points for favourite scenes (e.g., TV mode).
• Overload protection: Stall detection to avoid damage when blocked. :contentReference[oaicite:2]{index=2}
• Low-battery protection: Motor stops and alerts installers to recharge instead of running under unsafe voltage.

6. Engineering & Compliance – Designed for Cordless Safety

Global regulations increasingly push the industry towards cordless blinds, particularly in homes with children. The
Motorization Kit is engineered to help OEMs align with these expectations.

6.1 Cordless Architecture

Because lift cords and bead chains are completely removed from the user interface:

• There are no exposed cord loops in the room.
• The bottom rail is the only touch point, with a stable, two-hand friendly profile.
• Operation is intuitive: push up, pull down, or use the remote.

This architecture supports compliance with mainstream child-safety standards that restrict hazardous cord loops in residential products.

6.2 Quiet Operation & Comfort

Acoustic comfort is a key differentiator in premium blinds. In this kit:

• The constant-force spring smooths out torque spikes, reducing internal impact noise.
• The motor runs under partial load, which typically means quieter operation than full-load systems.
• Guided plastic housings and damping design minimize rattling in the headrail area.

6.3 Manufacturing Quality & Documentation

DOSRON can support OEM programs with:

• Dimensional drawings of motor, spring boxes, and adapters.
• Material specifications for springs, housings, tubes and plastics.
• Test reports and internal validation data for motor and spring performance.
• Assembly guides for factory lines and installation manuals for field teams.

7. Product Details & Configurations

7.1 Core Specification Table – 32 mm vs 38 mm Kit

Parameter	Ø32 mm Dual-Mode Kit	Ø38 mm Dual-Mode Kit
Tube Outer Diameter	Approx. 32 mm	Approx. 38 mm
Motor Platform	DT25 series for 32 mm tubes (0.4–0.7 Nm)	DT25 series for 38 mm tubes (0.4–0.7 Nm)
Battery Capacity Options	2,600 mAh / 5,200 mAh	2,600 mAh / 5,200 mAh
Spring Module Family	R32 constant-force spring boxes (multiple strengths)	R38 constant-force spring boxes (multiple strengths)
Typical Blind Types	Light-to-medium roller blinds, zebra blinds	Medium-to-heavier roller blinds, wider zebra blinds
Core Operation	Cordless manual lift + motorized control	Cordless manual lift + motorized control
Recommended Use	Bedrooms, home offices, smaller living room openings	Living rooms, hospitality, larger windows

7.2 Tubular Motor Technical Snapshot

The exact motor model used in the kit can be selected according to blind size and OEM preference. A simplified snapshot of the DT25 family looks like this:

Model	Battery (mAh)	Rated Speed (rpm)	Rated Torque (Nm)	Motor Length (mm)
DT25B1/28-32X	2,600	28	0.7	396
DT25B2/28-32X	5,200	28	0.7	461
DT25B1/25-32B	2,600	25	0.4	396
DT25B2/25-32B	5,200	25	0.4	461

Note: Additional models (for Ø38 mm tubes) follow the same logic; OEMs can select torque and battery according to their
blind program.

7.3 Configuration Comparison – Choosing the Right Kit

For OEMs building a portfolio, the Motorization Kit can be configured along three simple axes:

• Tube diameter: Standardizing around Ø32 mm and Ø38 mm keeps tooling and components under control.
• Torque & load: 0.4 Nm for lighter blinds, 0.7 Nm for heavier fabrics and wider spans.
• Battery size: 2,600 mAh for typical residential, 5,200 mAh for heavier use or reduced charging frequency.

By combining these variants with different R32 / R38 spring boxes, you can cover a wide range of blind sizes without creating a complex SKU jungle.

7.4 Matching Accessories

To build a complete product range around the Motorization Kit, DOSRON can supply:

• Wall / ceiling brackets matched to the motor and spring heads.
• Decorative fascia or cassette systems to conceal the tube.
• Bottom rails, side channels and hem bars for blackout or light-filtering projects.
• Handheld remotes, wall switches, and smart-home gateways.
• Solar panels and power adapters for charging support.

8. Installation & Commissioning Overview

8.1 Factory Assembly Flow

In the factory, the Motorization Kit fits cleanly into existing roller blind assembly lines:

1. Cut and prep the Ø32 mm or Ø38 mm aluminum tube to required size.
2. Bond the fabric to the tube and roll it to the correct initial position.
3. Insert the pre-tensioned spring box into the right end of the tube.
4. Insert the selected DT25 motor into the left end until fully seated.
5. Fit end caps, adapters and brackets as per hardware design.
6. Perform initial function check (manual lift and motorized drive).

8.2 On-Site Commissioning

Installers follow a straightforward process at the project site:

1. Mount brackets and snap in the roller blind assembly.
2. Use motor’s R1 key and the remote to power on and pair.
3. Set top and bottom limits with the blind at its physical end positions.
4. Optionally set one or two “favourite” intermediate positions.
5. Check manual lift behaviour — the spring should hold at any height with minimal drift.

Because the blind remains usable in manual mode even during commissioning, installers can fine-tune limits without stressing users or the hardware.

8.3 Maintenance & Service

Routine service focuses mostly on charging and occasional adjustment:

• Recharge every 6–9 months under typical household use. :contentReference[oaicite:5]{index=5}
• Inspect brackets and mounting points periodically in high-traffic spaces.
• For load changes (e.g., fabric swap), installers can re-tension or replace the spring module.

9. OEM / ODM Support – Building Your Own Dual-Mode Range

The Motorization Kit is designed as an OEM platform, not just a single retail SKU. DOSRON can help blind manufacturers and brand owners turn this hardware into a full product range.

9.1 Engineering Support

• Selection guidance for spring strengths vs tube size vs blind weight.
• Torque and battery recommendations for different region usage patterns.
• Bracket and headrail design support to fit local installation habits.
• Assistance integrating the kit into existing manual or motorized product families.

9.2 Branding & Customization

• Private-label packaging, printed manuals and QR-code installation videos.
• Laser-etched or printed logos on bottom rails, brackets and cassettes.
• Custom colour options on visible plastic parts and fascias.
• Firmware tweaks for preferred speed, soft-start / soft-stop behaviour or preset logic (subject to project volume).

9.3 Typical Project Scenarios

Examples of how OEMs can deploy this Motorization Kit include:

• A “good-better-best” range where dual-mode blinds sit between manual cordless and fully wired smart blinds.
• A hospitality bundle offering in-room motorized roller blinds without running mains power to the window.
• A retrofit-friendly solution for existing cordless spring-lift blinds by reusing tube sizes and brackets.

10. About DOSRON – Dual-Mode Motorization & Spring-Lift Specialist

DOSRON focuses on hardware platforms for modern blinds: constant-force spring systems, tubular motors, and integrated solutions like this Dual-Mode Motorization Kit. From spring boxes and shafts to remote controls and gateways, the goal is to give OEMs a modular toolbox for building safe, quiet, and smart blinds.

With dedicated production lines for springs and motors, DOSRON can maintain consistency from metal strip and POM granules all the way to finished blind hardware kits. For global customers, that translates into predictable quality and scalable supply.

11. Conclusion – Why This Motorization Kit Changes the Game

The Dual-Mode Motorization Kit for Cordless Spring-Lift Roller Blinds is more than a motor added to a blind. It is a complete mechanical and control architecture that:

• Keeps the familiar, intuitive behaviour of cordless spring-lift blinds.
• Adds the convenience and comfort of motorization on demand.
• Protects the clean visual language of modern blinds with fully in-tube components.
• Simplifies OEM hardware strategy via just two tube diameters and a rational spring / motor family.

For brands and fabricators, this is a practical way to step into smart blinds without abandoning proven cordless platforms.
For end users, it quietly blends manual and motorized control into one seamless experience.

12. FAQ

Q1: What exactly is “dual-mode” in this Motorization Kit?

“Dual-mode” means the blind can be operated both manually (via the spring-lift bottom rail) and
motorized (via remote or smart-home control). The same tube and hardware support both modes without exposed cords or chains.

Q2: If the battery is low, can I still move the blind?

Yes. The constant-force spring continues to provide manual lift function even if the motor battery is low. The motor will
stop when voltage falls below its threshold to protect the battery, but manual operation remains available.

Q3: Which tube diameters are compatible with this Motorization Kit?

The kit is designed around Ø32 mm and Ø38 mm aluminum tubes, which are common in roller blind manufacturing. Adapters and brackets can be customized for specific OEM profiles if needed.

Q4: Is this Motorization Kit suitable for all blind sizes?

The kit covers typical residential and light commercial blinds where 0.4–0.7 Nm tubular motors are appropriate. For very large or extremely heavy blinds, DOSRON can advise on whether this platform or a higher-torque solution is more suitable.

Q5: How often does the battery need to be charged?

Under normal residential use, a fully charged battery usually supports approximately 6–9 months of operation before
recharging is needed, depending on blind size and daily cycles.

Q6: Can this Motorization Kit integrate with smart-home systems?

Yes. With DOSRON gateways, the motor can be linked to Zigbee, Wi-Fi or other protocols, enabling control via mobile apps,voice assistants or automation routines while retaining manual spring-lift operation.