Opening and closing behaviour – factors
Various factors (such as sash format, sash centre of mass, hardware axis, etc.) influence the behaviour of the sash
and therefore operating convenience. The impact of a changing sash centre of mass, for example, is demonstrated
below. Other factors such as profile design, installation situation and wind conditions are not taken into consideration
at this point.
The opening behaviour is influenced by two factors: sash format (see diagram above) and profile geometry.
Example profile geometry
Sash centre of mass moved
inwards in relation to the
hardware axis
Sash centre of mass in
alignment with hardware axis –
optimal profile structure
Sash centre of mass moved outwards
in relation to the hardware axis
4
A
B
1
2
3
5
6
4
A
B
2
1
3
5
6
A
B
2
1
3
4
5
6
[A] Inside
[B] Outside
[1] Frame
[2] Sash
[3] Sash panelling
[4] Friction stay
[5] Hardware axis
[6] Sash axis centre of mass
INFO
Sash tends to open in an
uncontrolled manner.
This becomes worse as
the opening angle and
width increase.
Recommended: use of an
opening restrictor
INFO
Sash tends to fall back in an
uncontrolled manner when
opening. This becomes worse
as the opening angle and
width increase.
Recommended: use of an
opening restrictor
Information on the product
Application ranges
Top-Hung selection
Subject to change.
Roto FS Kempton
IMO_539_EN_v0
·
11 / 2020
· 25
