13
E
N
G
L
I
S
H
[3] Impact and Crushing on the Main
Closing Edge (figure 1, risk A)
□
Measure the closing stress (with the proper
tool required by regulation EN 12445) as
indicated in the figure.
Check that the values measured by the
instrument are less than the ones indicated in
the graphic.
Take measurements at the following points:
L = 50, 300, and 500mm;
H = 50mm,
at half of the height of the door and at the
height of the door minus 300 mm (max
2500).
N.B. The measurements must be taken three
times at each point.
In the graphic, the maximum values of the
dynamic operative, static and residual stresses
are indicated compared with the different
positions of the door.
N.B. As regards the measurement points L=50,
300, and 500mm, the maximum value allowed
by the dynamic stress is 400 N.
□
If the stresses' values are higher, install a
safety device in accordance with the regulation
EN 12978 (e.g. safety edge) and take the
measurements again.
N.B. The reduction of the dynamic stress can
be obtained for example by reducing the door
speed or by using a sensitive edge with a high
elastic shear.
Dynamic IMPACT
Stress
time
Stress
Static CRUSHING
Stress
1400 N
L>500 mm
400 N
L=50÷500 mm
150 N
25 N
5 s
0,75 s
Door with Overlapped and Delayed Close
Protective Device
Protective Device
500
300
50
500
300
50
F
F
E
N
G
L
I
S
H
30
0
50
=
=
