The tension spring is used wherever a normal gas pressure spring cannot be used for reasons of space. They support the hand force when opening flaps that have to be pulled upwards. This type of installation can be found in the exit hatches of elevators. In addition, tension springs are used when flaps are to be held when opening, for example desks with a folding work surface.
Mode of Action
In unencumbered state the piston rod of a tension spring is always retracted. By moving out of the piston rod the volume inside the cylinder decrease and the gas becomes compressed. The result is force increase (progression) of the gas spring dependent on diameter/ volume of the piston rod and diameter/ volume of the cylinder.
Addition the gas spring contains an oil filling for the lubrication and end position dampening.
More information about features, allowance and application in the technical instructions.