ENGINEERING STRUCTURAL BREAKDOWN

Spring System Works in Real Operation
NOTE
  •  ANSI/WCMA A100.1(U.S. Window Covering Safety Standard)
  • CPSC 16 CFR 1260(U.S. Federal Mandatory Cordless Rule)
  • EN 13120(European Child Safety Standard for Window Coverings)
  • AS/NZS 60335.2.97(Australia & New Zealand Safety Standard for Motorized Blinds)

At DOSRON, our cordless systems are engineered to eliminate exposed cords and hazardous loops — reducing strangulation risks at the source. Every architecture is developed in alignment with key global child-safety standards:

  • ANSI/WCMA A100.1(U.S. Window Covering Safety Standard)
  • CPSC 16 CFR 1260(U.S. Federal Mandatory Cordless Rule)
  • EN 13120(European Child Safety Standard for Window Coverings)
  • AS/NZS 60335.2.97(Australia & New Zealand Safety Standard for Motorized Blinds)

Because protecting children is not a feature upgrade.It is the starting point of responsible engineering.

Quick Summary

The Spring Assisted Cordless Lift System for roller shades, also known as the R38, is designed for effortless operation in cordless roller blinds. Compatible with 38mm diameter tubes, the R38 system consists of four key components: the Spring Box, Shaft, Brake, and Circlip/Pin for secure brake positioning. The core component, the Spring Box, is crafted from high-quality materials, featuring a 304 stainless steel spiral spring housed in a durable POM casing. This system ensures smooth, efficient, and child-safe operation of roller shades without the need for cords, making it perfect for both residential and commercial applications. With various spring box models, the system is adaptable to different curtain and rail weights.

Product Description

Spring Assisted Cordless Lift System for Roller Shades: The R38 Advantage

The R38 Spring Assisted Cordless Lift System is an innovative solution designed for roller shades, offering smooth, effortless lifting without the need for cumbersome cords. This system is compatible with roller shades that use 38mm diameter tubes, making it a versatile and reliable choice for a range of window treatments.

Key Features and Benefits

Cordless Spring Mechanism 1 Cordless Spring Mechanism 2
  • Cordless Operation for Enhanced Child Safety: The cordless operation eliminates the risks associated with traditional corded blinds, such as strangulation or entanglement. This feature has made the system especially popular for homes, daycare centers, schools, and offices, where child safety is a top concern.
  • Durability and Longevity: Built to last, the system includes a 301 stainless steel spring and a POM casing that ensure long-lasting performance and resistance to wear and tear.
  • Effortless Operation: The spring-assisted lift mechanism makes the operation of roller shades effortless. With minimal physical effort, the user can easily raise or lower the shades, making this system an excellent option for individuals with limited mobility or those who prefer ease of use.
  • Silent Operation: Unlike many other blind systems, the R38 system operates with minimal noise, ensuring a quiet and peaceful environment.
  • Versatile Compatibility: The R38 system is compatible with a wide range of roller shades, including blackout, sheer, and thermal roller shades, offering smooth and consistent performance across different fabrics and weights.
  • Modern Aesthetic: The sleek, modern design of the R38 system fits well into any décor. Its minimalist, clean appearance blends perfectly with contemporary and traditional interior designs.

Materials and Design

Spring Box

38RB Spring boxes

 

The Spring Box is the core component of the R38 system, housing the 301 stainless steel spiral spring that provides the necessary tension for the lift mechanism. The spring is precision-engineered to provide consistent performance while maintaining its strength over time. The POM casing surrounding the spring is a high-performance plastic known for its exceptional wear resistance and mechanical strength.

Shaft

Shaft 38SS 2+1
Shaft 38SS 2+1

Shaft 38SL 5+1
Shaft 38SL 5+1

The Shaft connects the spring box to the other components of the system and ensures that the force generated by the spring is effectively transferred to the roller shade. Made from durable materials, the shaft is designed to withstand high loads without bending or deforming, ensuring smooth operation.

Brake

R38 Brake

The Brake component plays a crucial role in controlling the movement of the roller shade. It provides a smooth, controlled descent of the shade, ensuring that it doesn’t fall too quickly. The brake’s design is such that it allows the shade to be lowered at a steady, controlled rate, enhancing both safety and functionality.

Circlip and Pin

Circlip
Circlip

Pin
Pin

The Circlip and Pin secure the spring box and brake components in place, ensuring that the system operates as intended without the risk of components loosening or coming apart. These small but essential components are made of corrosion-resistant metals, further enhancing the overall durability of the system.

Installation and Usage

Fabric/inch
/cm
36 48 54 60 64 72 84 86 96 102 112 Top rebound force Unit
91.44 121.92 137.16 152.4 162.56 182.88 213.36 218.44 243.84 259.08 284.48
Spring  mm
0.09*19*2000 180 207 220 234 243 260 287 292 314 327 350 50 g
0.10*19*2000 274 315 335 356 370 397 438 445 480 500 75 g
0.11*19*2000 382 426 448 470 484 513 557 565 600 125 g
0.12*19*2000 482 526 548 570 584 613 657 665 700 175 g

The R38 Spring Assisted Cordless Lift System is designed for quick and hassle-free installation. The system comes with easy-to-follow instructions, and no specialized tools are required for assembly. Whether you are a DIY enthusiast or a professional installer, the process is straightforward. The system is designed to fit securely into 38mm diameter tubes, with clear steps to mount the components.

Operating the R38 System

Once installed, the R38 system offers effortless lifting and lowering of the shades. Simply pull or release the bottom bar of the shade to raise or lower it. The spring-assisted design ensures that minimal physical effort is required, making the system suitable for all users, regardless of age or strength.

Maintenance and Care

The R38 Spring Assisted Cordless Lift System requires minimal maintenance. To keep the system functioning smoothly, it’s recommended to clean the components periodically with a soft cloth to remove any dust or debris. The spring and other internal parts are sealed within the spring box, preventing external elements from affecting its performance.

Advantages of the R38 System

Cordless Blind Cordless Shade
  • Child-Safe: Eliminates the danger of cords, making it ideal for homes and facilities with young children.
  • Durable and Long-Lasting: Built with high-quality stainless steel and POM casing, ensuring long-term reliability.
  • Efficient and Quiet: Provides smooth and quiet operation, enhancing comfort in any environment.
  • Flexible and Versatile: Suitable for a wide range of roller shades and applications, from residential to commercial spaces.
  • Easy to Install and Use: Can be quickly installed and operated with minimal effort.

Frequently Asked Questions (FAQ)

1. How does the R38 system work?

The R38 system uses a spring-assisted mechanism to raise and lower roller shades without the need for cords. The spring box, made from durable stainless steel, provides the lifting force, while the brake ensures smooth and controlled movement.

2. Is the R38 system compatible with all roller shades?

The R38 system is designed to work with 38mm diameter tubes. It is compatible with most standard roller shades, including blackout, sheer, and thermal shades.

3. Can I install the R38 system myself?

Yes, the R38 system is designed for easy installation. Clear instructions are provided.

4. Is the R38 system child-safe?

Yes, the cordless operation eliminates any safety risks associated with traditional corded blinds, making the R38 system ideal for homes with young children.

Field Insight

The R38 Spring Assisted Cordless Lift System for roller shades is a true game-changer in window treatment solutions, offering unmatched benefits in terms of safety, durability, and ease of use. With its child-safe design, long-lasting materials, and effortless operation, this system is ideal for both residential and commercial settings. Here’s a final look at the core advantages:

  • Enhanced Child Safety: The cordless operation eliminates the dangers of traditional corded systems, making it a perfect choice for homes, schools, and daycare centers where child safety is a priority.
  • Durability and Longevity: Built with corrosion-resistant materials like 304 stainless steel and a high-performance POM casing, the R38 system ensures reliable and smooth operation for many years.
  • Effortless Operation: The spring-assisted lift mechanism provides smooth, easy adjustment of roller shades, ensuring a user-friendly experience with minimal physical effort required.
  • Quiet and Smooth Functionality: The system operates with minimal noise, ensuring that users can adjust their shades without disrupting their environment, whether at home or in a professional setting.
  • Versatility: Whether for light sheer shades or heavy blackout ones, the R38 system is versatile enough to support a wide range of roller shades, making it suitable for diverse window treatments across various applications.
  • Modern Aesthetic: The sleek, cord-free design complements modern interior décor, providing a clean, minimalist look that enhances any space.

With all these features, the R38 Spring Assisted Cordless Lift System not only offers top-tier functionality but also aligns with modern safety standards, environmental concerns, and aesthetic preferences. It’s the perfect addition to any window treatment setup, ensuring both convenience and peace of mind.

Capacity & Drop

R32 spring box Capacity & Drop

Spring Box PN.

Maximum Capacity /g

Support Maximum Drop /inch

Support Maximum Drop /cm

0.07*16*2000

   

0.08*16*2000

   

0.09*16*2000

   

0.10*16*2000

   

0.11*16*2000

   

 

R38 spring box Capacity & Drop

Spring Box PN.

Maximum Capacity /g

Support Maximum Drop /inch

Support Maximum Drop /cm

0.09*16*2000

   

0.10*16*2000

   

0.11*16*2000

   

0.12*16*2000

   

Why Us?

This will help you understand the differences between our products and those currently on the market.

Item

Electric tubular motors for cordless Spring Mechanism Roller BlindVSElectric tubular motors for cordless Spring Mechanism Roller BlindVSElectric tubular motors for cordless Spring Mechanism Roller Blind

Stablity

   

Force compensate

   

Assembly Safety

   

SKU

   

Lifecycle

   

Cost

   

Operation

   

Patents & Certifications

We design and manufacture cordless spring mechanisms and tubular motors for roller shades, honeycomb shades, zebrablinds, and venetian blinds,roman shades and more. Trusted by top international brands, DOSRON delivers scalableOEM/ODM solutions worldwide.

Get in touch

If you are interested in our solutions, please leave us a message. Let us provide a complete solution tailored to your specific situation.

Frequently Asked Question about Dosron

Q1: Is this Cordless Spring Drive suitable for motorized zebra blinds?

No. This system is engineered for manual cordless zebra blinds. Hybrid motor-spring platforms use different control logic.

Q2: How many Spring Boxes should I use?

It depends on measured fabric + bottom rail weight and required drop. Use the selection table to choose model and quantity per Shaft.

Q3: Why is pre-winding required before installation?

Pre-winding stores initial energy so the system enters the intended force band immediately. The Pin locks the pre-tension state.

Q4: Can a stronger Brake solve drift if the spring is mismatched?

Not reliably. The Spring Box defines the force band; the Brake only governs motion within it. Correct selection comes first.

Q5: Can different Spring Box models be mixed on one Shaft?

Yes, but only with proper load calculations to keep force distribution stable across the full travel.

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