French wooden windows are distinguished not only by their style but also by their double-sash opening system without a fixed post. This result, typical of French window joinery, is achieved thanks to mechanism such as the GDL (Wolf’s Jaw) closing.
GDL (Wolf’s Jaw) – simultaneous opening of both sashes
The GDL (Wolf’s Jaw) system we offer is based on a movable central post. When the window is opened, both sashes open simultaneously thanks to an ingenious mechanism inspired by the „wolf’s jaw – sheep’s head” principle. This allows for complete freedom of space, providing panoramic views and unobstructed access.
This type of opening is particularly appreciated in wooden window designs installed in kitchens or living rooms, where natural light and convenient access are a priority.
Interior aesthetics – the importance of a movable post
French wooden windows are often left uncurtained, especially in modern or classic interiors. As a result, their appearance becomes a decorative element on its own.
The version with a central handle integrated into the movable post is particularly recommended because it guarantees:
- Perfect visual symmetry
- Convenient opening and closing
- High-quality joinery solution
Locking system with Cremona – the authentic charm of old houses
Cremona is a traditional locking system („handle”) – often decorative – used to close French windows.
It’s ideal for historic renovation projects where it is desired to recreate a vintage, authentic style.
- Elegant wrought iron or brass handle
- Vertical tie rod lock
- Compatible with most wooden double-sash windows
