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Locking gas springs

 


A lockable gas spring functions basically the same way of a gas push spring. Contrary to a standard gas spring, a lockable gas spring can be adjusted continuously in every required position. Classic fields of application are e.g. height adjustments of tables or adjustments of back rests of beds or armchairs.


Pressure: from 150 Newton (=15 kg) to 1200 Newton (=120 Kg)
Stroke: from 20 mm to 500 mm

The way of locking can be delivered in three different ways: 
- Flexible locking gas springs
- Rigid in tension locking gas springs
- Rigid in compression locking gas springs
 

This type of gas spring can be mounted in any position, however, it is recommended to mount this type of gas spring with the plunger downwards to avoid any dirt penetration at the release pen. 


Flexible locking gas springs
 
A flexible locking gas spring has gas on both sides of the piston. This gas is compressible so if sufficient force is applied on the rod when it is locked, either in tension or compression, the gas will compress and the rod will move a few millimeters from its locked position. When the force is removed the rod will return to its original position, while remaining locked. This gives the characteristic flexible movement.  
 
A small quantity of oil is inserted into the spring so that when he is mounted in his normal rod down position, the seal is lubricated for a maximum life. Other orientations are possible with an addition oil chamber.
 
High oil fill design: A gas spring built as a flexible locking spring with a high oil fill and an oil chamber will provide a fully rigid in compression function should this be required. 
 

Rigid in tension locking gas springs
 
Rigid in tension locking gas spring has oil on both sides of the piston such the chamber where the rod enters the body and the piston is always full of oil. This oil is contained by a floating piston that separates it from the gas in the enclosed tube. Since oil is incompressible, when a tension load is applied to the locked rod the oil between the nose bearing and the piston will not compress and the piston cannot move.
 
When a locked, rigid in tension springs is subjected to a compression load, only the compressible gas resists the force transmitted from the piston to the floating piston. This gas will consequently compress and permit the rod to move.  However, because the oil on the other side of the locked piston cannot expand, the permitted movement is significantly less than experienced on a flexible locking gas spring.

In addition, because the oil is always held between the piston and nose bearing (containing the main seal), a rigid in tension locking spring can be mounted in any orientation..  
 

Rigid in compression locking gas springs
 
This gas spring is similar to the rigid in tension locking spring with oil on both sides of the piston. However, at this type of gas spring the oil is contained in the closed end of the tube and a floating piston retains the gas in the nose bearing end chamber. When a compressive force is applied to the locked rod, the oil between the piston and the closed end of the tube will not compress and the rod cannot move. 
Conversely when a tensile force is applied, the gas in the nose bearing will compress permitting a small amount of movement but again, since the oil in the closed end cannot expand, the movement is less than that experienced with a flexible locking spring. 
 
A small quantity of oil is inserted into the gas chamber so that when he is mounted in his normal rod down position, the seal is lubricated for a maximum life. Other orientations are possible with an addition oil chamber.
 
A release valves is not available for rigid in compression gas springs, due to their construction.

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