The gas springs manufactured by MOLITON Ltd. can be used as a spring-like machine element for moving or supporting the doors, seats or other parts of cars, buses, trucks, tractors, machine tools, buildings, furniture, etc.

A gas spring, as opposed to a mechanical spring:

• it forms a compact unit,
  allows easy connection in many variations,
• provides a flat characteristic with high spring force and stroke,
• capable of controlled movement,
• its end position can be damped by means of an internal structure,
• can be positioned along its stroke as desired.

Our gas springs have adequate corrosion protection:

• • tube: black painted

• • piston rod: nitridated or hard chromed

• • End connectors: painted or zinc plated

Gas springs are available in four rod/pipe diameters: 6mm/15mm, 8mm/18mm, 10mm/23mm and 14mm/28mm. There are also different pairings, namely 8mm/23mm and 10mm/28mm. For example, hard-locking gas springs are only available in 10mm/28mm.Each rod diameter has a maximum force that we can produce a gas spring with that rod diameter. In order to avoid rod deflection, there is also an upper limit to the product of the stroke (L, [mm]) and the extension force (F1, [N]).

We can also make gas springs to meet your specific needs. Ask our team for help if you can’t decide which type of gas spring is right for you.

Our gas springs are compression gas springs. We do not manufacture compression gas springs.

Installation suggestion:

The gas spring is only suitable for absorbing axial forces in the direction of the rod! The axial load is only axial – axial load only. The gas spring must be installed with the rod downwards! Otherwise, the rod will no longer be lubricated and the service life of the gas spring will be considerably reduced. A horizontal installation should be avoided. During operation, neither the tube nor the rod face should touch other structural elements to avoid seizing of the gas spring. The gas spring is not suitable for the end-positioning, end-positioning-locking of heavy, inertia elements. In such cases, the gas spring may be subjected to a tensile load so great that the gas spring fails. In such cases, some other means of impact shall be used to prevent the gas spring from being pulled apart.

The piston rod must be protected:

• mechanical damage of any kind
• particles, dust
• paint coatings
• acidic, alkaline media
• welding particles
• adhesives

Calculating the force of the gas spring:

Figure 1. – Determination of Gas Spring tension adjustment

S – centre of gravity
a, b – distance of forces from the fulcrum [mm]
F₁ – extension force of the gas spring [N]
m – door weight [kg]
g – gravity acceleration (9,81 m/s²)
n – number of gas springs (normal: n=2)
k – safety factor (k=1,3)

Distances „a” and „b” must always be measured in the position where the door exerts the maximum torque to the fulcrum. Thus in the example above, the position where the door is opened squarely should be examined.

Five versions of rod extension speed control

1 – braking when the rod is moving outward

2 – braking when the rod is moving inward

3 – braking in both directions of movement

4 – no braking

5- braking when the rod is moving outward (increased braking)

Most gas springs are with braking 1. Braking 2 is not too frequent, because the inward movement is damped by the gas from the beginning. Usually braking the movement outwards is more important than braking the movement inwards. Braking 3 is more widespread. In this case both the inward and outward movements are at a constant speed. All our lockable gas springs are produced brake type 3. Braking 4 is very rare.

Operation conditions:

• Temperature range: -30 C^o – +80 C^o
• Frequency: max. 5/min.

Maintenance:

If properly installed and used, gas springs do not require any maintenance.

Safety introductions:

Gas springs are filled with high pressure nitrogen gas (10-200 bar), unprofessional disassembling is dangerous and prohibited. The assembled gas spring does not constitute a source of danger and does not require any special treatment.

Disposal:

Gas springs are predominantly made of metal parts. After oil and pressure release, handle it as steel scrap.

Releasing the gas:

• Bore a 1.5 mm hole into the tube at 30 mm from the tube end (opposite to the rod). When the wall brakes, the gas comes out from the tube and blows out the sliver, so using goggles is mandatory.
• Pump the oil out from the gas spring and pour it to the used oil.
• The leaving nitrogen gas is harmless to the environment.

Warranty:

Warranty is 1 year from the date of manufacturing which is indicated on the gas spring.

Warranty void if:

• the tube or rod is damaged or shows lateral abrasion – gas has been released because of incorrect installation or usage,
• the piston rod has been soiled with another substance (paint, adhesive, grains, powder) and as a result the sealing is damaged,
• the operating frequency has exceeded 5 cycles per minute, hence extreme load and abrasion has occurred,
• the gas spring suffered extremely big tensile strain and the piston is pulled through the stroke limiter,
• the data plate on the gas spring is painted over or removed and the date of manufacturing is illegible,
• the gas spring has been used outside the specified temperature range