Windows with vertically moving sashes are called "Sash Windows".

Modern mechanisms have made sash windows as practical and safe to use as they have never been before.

Besides being used in period buildings, sash windows are also employed in new residences for the sake of practicality and architectural concerns in the whole Europe.

Sash windows are supposed to originate in Holland. However the oldest written document in this issue dates back to 1669 and is from Britain: The famous British architect Sir Christoper Wren, orders Thomas Kinward (a carpenter in London) to place cords and pulleys to the sash windows in Queen's drawing room. This refers to the traditional mechanism, which enables to stop the sash vertically at the desired position and to move it easily by hand. Modern mechanisms are in a way more developped versions of what Sir Christoper Wren mentioned at his time.

A modern mechanism, consisting of stainless steel springs placed in a pipe of 16-26 cm diameter is able to move a 45 kg sash simply by your fingers and to leave it at any position you like. Historical sash mechanisms, on the other hand, continue to draw attentions with many examples still working on period buildings from 19th and 18th centuries.

The common practice in many countries is to conserve period buildings by controlling renovation works and therefore, replacement of historic windows must replicate the detailing of the originals. ARBOR manufactures sash windows with modern mechanisms for both contemporary and historic buildings.

Sash Windows With Counterweights:
Traditional sash windows consisting of two sashes, which slide vertically in a frame, supported by cords that are balanced with metal weights are still manufactured by skilled carpenters in small scales. However such windows usually turn out to bring difficulties during use.
The following sketch shows such a traditional balance system.
Üst makaralar: Pulleys
K.ağırlık blokları: Metal weights.
İç cephe:Inside. Dış cephe: Outside
K.ağırlık boşluğu: Space for metal weights.

Spiral Type Sash Mechanisms:
They are essentially used for timber sash windows. They are good for windows with sash weights from 1 kg to 18 kg, and dimensions from 200 mm to 1200 mm.
An aluminum pipe of 14 mm diameter and a spiral metal band are the main components. They are widely used today for small sash windows substituting the traditional cord - pulley system. System components are shown below:

Spring Balances For Sash Windows:
This is the most developped sash mechanism and is the one preferred by ARBOR.
Many people believe that sash windows are expensive, costly to replace and most important of all, unreliable to use. This is not true, provided that the appropriate system is chosen. Sash windows operate with metal spring systems as easy and smooth as they have never done before.
Spring balances are available for sashs from 30 cm to 180 cm height and from 3 kg to 50 kg weight.
A metal spring sash window and the sections of spring mechanisms are shown below.

Double Hung Windows With Tilting Sash:
Cleaning may be difficult for sash windows.

Tilting double hung windows incorporate sash that tilt smoothly in. This is in addition to their normal vertical operation. Tilting enables safe ventilation and easy cleaning.

A double hung window with both sash tilt is shown below:

Benefits of Sash Windows

1. Unlike an inwards-opening side-hung sash, a vertically moving sash doesnot affect the life and decoration inside. You may use the space in front of your sash window as you like.
2. The vertically moving sash can be left at any position.
3. Modern sash windows are highly reliable with developped spring mechanism.
4. Tilting sash enables easy cleaning.
5. Sash windows enables safe ventilation. Vertical moving sash stays fixed even during air current while side-hung sash may open or close without control
6. Ventilation gap may be adjusted precisely by moving sash and leaving it where desired.
7. Unlike casement windows, curtains will not be deformed in front of an open sash window.

ARBOR SIGN OF DISTINCTION