Lift Type (Push) Gas Springs, Gas Struts

Locking Gas Springs & Struts , Usage Fields, Control Units

Introduction Liftstrut Series

Liftsrut Series are most popular product group of MS Motion. Main function of this type is lifting or counterbalancing lids, hatches or similar applications. Lift type gas springs are easy to observe in almost all industries, such as furniture, automotive, medical, aerospace, marine, machinery and etc.

How Does Gas Spring Work?

work based on the principle of compressed gas exerting force to generate a lifting or supporting motion. They consist of a cylinder filled with pressurized gas, typically nitrogen, and a piston rod that moves within the cylinder.

Here’s how lift-type gas springs work:

Compressed Gas: The cylinder of the gas spring is filled with pressurized gas, which is typically nitrogen. The pressure of the gas inside the cylinder determines the force that the gas spring can exert.
Piston and Piston Rod: Inside the cylinder, there is a piston connected to a piston rod. The piston is designed to move freely within the cylinder, and the piston rod extends outward from the cylinder.
Extension: When force is applied to the piston rod, such as by pushing or pulling, the gas inside the cylinder compresses. This compression generates force, causing the piston rod to extend outward from the cylinder.
Compression and Energy Storage: As the piston rod extends, the gas inside the cylinder is compressed, storing potential energy within the gas spring.
Locking Mechanism (in some cases): Some gas springs come with a locking mechanism that can be engaged to fix the piston rod at a specific length or position. This feature allows the gas spring to hold a load in place securely.
Controlled Motion: Lift-type gas springs provide a controlled and damped extension and compression motion. The resistance to movement comes from the gas compression and, in some cases, additional damping features.
Support and Lifting: Lift-type gas springs are commonly used to support, lift, or assist in the movement of various objects, such as lids, hatches, doors, and adjustable components in furniture and machinery.
Release of Energy: When the force is released or the load on the piston rod is reduced, the gas spring will extend or compress to release the stored energy and return to its original position.

How to Measure Gas Spring

In case of custom design or ordering replacement gas springs there are some important parameters that needed to be provided. These parameters are;

– Extended Length (L) ; it needs to be measure as gas spring fully extended or opened. If there is not end fitting on gas spring please measure excluding threads. If there are end fitting ong gas spring please measure from center to center.

– Stroke Length (s) ; it is actually difference between fully extended and fully compressed length.

– Pressure Rate (F1) ; which can be considered as lifting power of gas spring. Each diameter range provides certain power capacity. F1 value can be stated as Newton (N) or Pound (Ibs).

Dimension Parameters of Inoxlift gas springs are being measured by universal tools which calibrated periodically according to DIN 865/866 considering item drawing. Tolerance rate is ± 2 mm in accordance with TS 1980-2 EN 22768-2.

Endurance, Lifetime

Liftstrut Series Gas springs are designed in such a way that they can reach some 100,000 cycles via the whole stroke without problem. Which means without force loss, oil leakage. Besides, corrosion resistance is main expectation from gas springs. We provide our Liftstruts Series gas springs with above 120 hours salt duration.

Salt Spray Tests being occured by officially registred laboratories according to TS EN ISO 9227 Corrosion tests in artificial atmospheres – Salt spray tests. 100 hours is acceptance criteria.

This standard describes the spraying of a salt solution in the chamber at 35°C or 50°C. Acetic acid or copper chloride can be added to the NaCl solution to accelerate the reaction. The fine salt fog condenses on the test samples and initiates corrosion. A salt spray chamber according to DIN EN ISO 9227 is supplied with a minimum volume of 400 litres.

Pressure Parameters and Tolerances

Liftsrut Series gas spring is a closed system consisting of a pressure tube and piston rod with piston, as well as compressed Nitrogen (N2) as an energy source and a lubrication oil. Pressure rate of gas spring generally defined as F1 with unit of N (Newton).

In order to get most certain results, test environment should be 20 C° (±3°). Positioning in test equipment as rod side down. There are 2 main measurement methods for measuring pressure rates of gas springs.

Dynamic Measurement

From the fully extended position,the gas spring is compressed at a con-stant test velocity until fully compressed. The subsequent, automatic extension is controlled at the same constant velocity. During com-pression/extension, the force reaction is recorded, resulting in the cha-racteristic curve. F3 measured in after 5mm compressed of rod. F4 measured 5mm before fully compressed position.F2 measured 5mm extension after fully compressed. F1 measured 5mm before fully extended position.

Static Measurement

Similar to the dynamic measurement, the static measurement is performed with a constant speed. However, the motion is interrupted at the measuring points and the spring force is measured in a static condition. F3 measured in after 5mm compressed of rod. F4 measured 5mm before fully compressed position.F2 measured 5mm extension after fully compressed. F1 measured 5mm before fully extended position. Dynamic measurement is being applied to force measure, unless otherwise specified. F1 rate is being compared to referance drawing.

Liftsrut Series Usage Fields - Applications

ift-type gas springs find extensive application across various industries due to their versatile and reliable nature. These mechanical devices, also known as gas struts or gas shocks, are commonly utilized in automotive engineering to support the opening and closing of hoods, tailgates, and trunk lids effortlessly. Additionally, in the furniture industry, they enable smooth and controlled movement for adjustable chairs and recliners, enhancing user comfort. In the aerospace sector, lift-type gas springs aid in stabilizing aircraft components and cabin amenities, optimizing weight distribution and facilitating access to maintenance areas. Furthermore, these gas springs are instrumental in the medical field, supporting adjustable hospital beds and medical equipment, ensuring ergonomic patient care. Beyond these domains, lift-type gas springs serve numerous other applications, ranging from industrial machinery to agricultural equipment, proving indispensable in scenarios where controlled lifting, lowering, and positioning are essential for enhanced safety and efficiency.