Application Range - FlexiForce 651LH Installation Manual

Installation, maintenance and repairs can only be done by qualified and experienced

APPLICATION RANGE

The Flexi-Force spring breaking devices 651 and 667 can be used for residential (garage) overhead doors, both manually
operated as well as power operated doors.
Model 651 is used for torsion springs with an internal diameter of 44,5 mm (1 ¾") and 51 mm (2") with the proper plugs.
These are the spring plugs from our delivery program with article codes: FF-1.75, FSW51and FF-2.00TAI.
Model 667 is used for torsion springs with an internal diameter of 67 mm (2 5/8") with the proper plugs. These are the spring
plugs from our delivery program with article codes: FF-2.63TAI and FSW67.
Both types are suitable for garage overhead doors with a 1" tubular shaft without key-hole (article code 701-....Z) and small
normal lift cable drums (article code FF-4X8 and FF-4-13).
The max. torque per spring breaking device for type 651 is 31.5 Nm.
The max. torque per spring breaking device for type 667 is 42 Nm.
For the above mentioned cable drums (diameter 105,6 mm; with cable diameter 4 mm) the maximum door weight can be
determined with the next formulas:
Maximal torque [Nm]
0.5 x D drum [m]
Model 651 31.5 ____
0,5 x 0,1056 = 600 N
Model 667 42 ____ _
0,5 x 0,1056 = 800 N
We strongly recommend always to use two torsion springs to balance a door.
Attention: The maximum door weight, determined by the supplier of the cable drums,
may not be exceeded. Per torsion spring one spring breaking device can and must be used.
TUV-APPROVAL
The spring breaking devices, types 651 and 667 are approved under number 01020 from the BG (Berufs Genossenschaft
"Bauliche Einrichtungen in Bonn, Germany). They both are tested by TÜV (Technische Uberwachungs Verein, Bayern). With
this, the devices easily match the demands from the new European Norms, such as the EN12604 (mechanical aspects).
FUNCTIONING OF THE SPRING BREAKING DEVICE:
By tensioning the torsion spring(1) the cam shafts(4) rotate in the slotted holes of the bearing plate(9). The spring(6) fitted on
the bearing plate (9) pushes against the camshaft (4a) without pal. The camshaft (4b) with pal(10) turns around the stift
(turning point) on the bearing plate and the edge of the pal is being released out of the tooth of the palwheel(5), which is
fitted onto the shaft.
When the spring breaks, the tension of it drops. Because of this drop of tension and the sudden release of energy from the
spring, the camshafts rotate in the slotted holes of the bearing plate.
This causes the camshaft pal to turn around the stift on the bearing plate and the edge of the pal droppes into one of the
tooth of the palwheel which is fitted onto the shaft. This stops the drop of the door. Plate(11) is reinforcement of the
orig\651manual gb.ja3
GENERAL WARNINGS!
There is a lot of tension on torsion springs.
At all times, work safely and with proper precautions.
overhead door mechanics.
= [N] F [N] = m [kg] x a [m/s2]
600
m = 10 = 60 kg
800
m = 10 = 80 kg
MANUAL
(a=10)
2