Product Overview
The Schellenberg Screw-in Winder is a robust and practical solution for roller shutter systems. This brown plastic housing unit is designed for surface mounting, typically on a wall or window frame, making it suitable for both new installations and renovations. It comes as a pre-assembled, closed unit with a pre-tensioned roller shutter belt already integrated.
This specific model is designed for the Maxi roller shutter system, featuring a brown strap with a width of 23 mm and a length of 5.3 meters. The winder offers a 180° swivel capability and has a standard hole spacing of 170 mm for easy installation.

Figure 1: Side view of the Schellenberg Screw-in Winder, showcasing its compact brown housing and the integrated strap.
Key Features
- Swivel Belt Winder: Designed for roller shutters, allowing for flexible positioning.
- Screw-on Mounting: Easily mounts on the wall or window frame.
- Closed Unit: Includes a pre-tensioned roller shutter belt for immediate use.
- Maxi System Compatibility: Features a brown webbing with 23mm width and 5.3m length.
- 180° Swivel: Provides versatility in operation and installation, with 170 mm hole spacing.

Figure 2: The winder demonstrating its 180-degree swivel capability, enhancing user convenience.
Setup and Installation
Installation of the Schellenberg Screw-in Winder requires careful attention to ensure proper function and safety. The unit is designed for surface mounting.
Required Tools:
- Drill
- Screwdriver
- Measuring tape
- Pencil
- Level
Installation Steps:
- Prepare the Mounting Surface: Identify the desired location on the wall or window frame. Ensure the surface is clean, flat, and structurally sound.
- Mark Drilling Points: Hold the winder in position and use a pencil to mark the two drilling points for the screws. The hole spacing is 170 mm. Use a level to ensure vertical alignment.
- Drill Pilot Holes: Drill pilot holes at the marked points. The size of the drill bit should be appropriate for your screws and wall material.
- Mount the Winder: Secure the winder to the wall or window frame using appropriate screws. Ensure it is firmly attached and does not wobble.
- Connect to Roller Shutter System: To attach the pre-assembled webbing to the belt pulley, you will need to open the roller shutter box. Carefully feed the strap into the roller shutter box and secure it to the roller shutter's belt pulley according to your roller shutter system's instructions.
- Test Operation: Once installed, slowly operate the roller shutter to ensure the winder functions smoothly and the strap retracts and extends without obstruction.

Figure 3: An example of the screw-in winder installed on a wall next to a window, demonstrating its typical application.

Figure 4: Technical drawing illustrating the dimensions of the screw-in winder, including its height (188 mm) and width (156 mm).
Operating Instructions
Operating the Schellenberg Screw-in Winder is straightforward. The winder is designed for manual operation of your roller shutters.
- To Lower the Roller Shutter: Gently pull the strap downwards. The winder will release the strap, allowing the roller shutter to descend. Control the speed of descent by maintaining a steady pull.
- To Raise the Roller Shutter: Pull the strap upwards. The winder will retract the strap, lifting the roller shutter. Continue pulling until the roller shutter reaches the desired height.
- Swivel Function: The winder can be swiveled 180° to adjust the angle of the strap for comfortable operation or to move it out of the way when not in use.
Avoid sudden jerks or excessive force when operating the winder, as this can cause premature wear or damage to the strap and internal mechanism.
Maintenance
The Schellenberg Screw-in Winder is designed for durability and requires minimal maintenance. Regular inspection can help ensure its longevity and smooth operation.
- Cleaning: Wipe the exterior of the winder with a soft, damp cloth to remove dust and dirt. Do not use abrasive cleaners or solvents, as these can damage the plastic housing.
- Strap Inspection: Periodically inspect the roller shutter strap for any signs of fraying, wear, or damage. If the strap shows significant wear, it may need to be replaced to prevent operational issues.
- Mounting Security: Check the mounting screws periodically to ensure they remain tight and secure. Retighten if necessary.
- Internal Mechanism: The winder is a closed unit and does not require internal lubrication or maintenance. Do not attempt to open the housing, as this may damage the pre-tensioned mechanism and void any potential warranty.
Troubleshooting
If you encounter issues with your Schellenberg Screw-in Winder, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Strap does not retract smoothly or gets stuck. |
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| Roller shutter does not move up or down. |
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| Winder makes unusual noises. |
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If the problem persists after attempting these solutions, contact Schellenberg customer support or a qualified technician.
Specifications
| Model Number | 50803 |
| Manufacturer | Schellenberg |
| Product Dimensions | 7.4 x 6.14 x 1.34 inches (approx. 188 x 156 x 34 mm) |
| Item Weight | 1.1 pounds (approx. 0.5 kg) |
| Color | Brown |
| Strap Type | Maxi Roller Shutter Strap |
| Strap Width | 23 mm |
| Strap Length | 5.3 meters |
| Swivel Angle | 180° |
| Hole Spacing | 170 mm |
| Included Components | 1 x screw-on winder with roller shutter strap, pre-assembled |
| Batteries Required | No |

Figure 5: Product packaging highlighting key specifications and the "Made in Germany" label.
Warranty and Support
For information regarding product warranty, returns, or technical support, please refer to the official Schellenberg website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
Manufacturer: Schellenberg
Website: www.schellenberg.de (Please note: This link is for informational purposes and may lead to an external website.)