When a locked, rigid in tension springs are subjected to a compression load, only the compressible gas resists the force transmitted from the piston to the floating piston. However, because the oil on the other side of the locked piston cannot expand the movement permitted is significantly less than experienced on a flexible locking gas spring. This gas will consequently compress and permit the rod to move. In addition, because the oil is always held between the piston and nose bearing (containing the main seal), a rigid in tension spring can be used in any orientation.
Rigid in tension lockable gas springs have oil on both sides of the piston such that the chamber between (where the rod enters the body) and the piston is always full of oil. 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 rod cannot move.This oil is contained by a floating piston that separates it from the gas in the enclosed tube.
Applications for rigid in tension locking springs include hospital beds, aircraft, coach and rail seat back recline control and wheel chair recline and support systems.
|
| Flexible 10/23 | Flexible 10/28 |
| Shoulder length constant | 3.66 | 3.98 |
| Multiplier | 2.5 | 2.5 |
| K factor obtained (P2/P1) | 1.5 | 1.3 |
Example - Calculation of shoulder length for a rigid in tension locking gas spring with a 28mm body and a stroke of 120mm: Minimum shoulder Length = (4x2.5) + 3.98 = 11.98"
Flexible 10/23 Flexible 10/28 Body diameter B 23 28 Maximum force required to depress the plunger (P2 is the force 5mm from full compression) 14% of force P2 14% of force P2 Admissible P1 force from 34 to 150 Pounds from 34 to 150 Pounds
(P1 is the force 5mm from full extension)
Calculate the shoulder length for a rigid in tension locking gas spring
Shoulder Length = (stroke x multiplier) + Shoulder length constant
