Gas Spring

Chair gas springs are designed especially for variable and comfortable seat height adjustment of office swivel chairs, task & executive chairs. This is made possible by the patented double cylinder system, consisting of a pressure tube and a guide tube. The self-supporting pressure tube is designed to allow bending moments, for example if the load on the seat is not centered.

Properties and Advantages of Swivel Chair Gas Springs from WinWorld

Available in different classes based on customer request

Available in different lengths and strokes

Swiveling and non-swiveling versions

Complete columns with different outer tube versions (Black or Chrome electroplated)

Different conic length adopted with your bases and mechanisms

Gas spring Pressure

As can be seen from the graphic, the spring characteristic represents the force progression of the gas spring over the stroke, from the extended to the compressed state and back. In the process, the spring characteristic value represents the force ratio F2/F1. When designing a gas strut, the force F1 is the most important criterion in addition to the dimensions. The force F1 is measured 5 mm before the end of the extension movement, thus defining the value of the spring force. The force FR resulting from the friction is created between the force lines in the compressed and extension direction. The extension speed is divided into two types of damping: With the standard gas spring, the extension speed is controlled via a pneumatic and hydraulic range. When installing the gas strut with piston rod facing down, the piston first moves through the gas-filled part (pneumatic area), then through the oil-filled part of the pressure tube (hydraulic area). The piston rod is braked by the oil.
If desired, the damping can also occur dynamically. For this purpose, a longitudinal groove is provided in the pipe, which allows for a positionally-independent damping of the gas spring.

Pressure-Displacement diagram

Gas spring class

Gas springs are mainly selected by their manufacturing class. Different metal thicknesses in main body and cover and its strength against exerted moments cause to provide different solutions. Here are mainly points to be remarked when ordering.

Class 1: 1.2 mm spindle pipe and 1 mm spindle guide. (Not recommended!)
Class 2: 1.5 mm spindle pipe and 1 mm spindle guide. (Standard)
Class 3: 2.0 mm spindle pipe and 1.5mm spindle guide. (Heavy duty)
Class 4: 2.5 mm spindle pipe with QPQ treatment and 1.5mm spindle guide. (Super Heavy duty)

Type of ending joints

Formed metal

Welded

Displacement stroke:

Based on the chair height standard and its specification, different strokes are recommended. Usually following rules are considered
Stroke 60 mm: Heavy managerial/executive chairs
Stroke 80 mm: Normal managerial chairs
Stroke 100-120 mm: Staff chairs
Stroke 150-210 mm: Counter chairs
Stroke 260 mm: Bar chairs

Some additional useful information about packing and container arrangements

Depending on type of packing (wrapped by Kraft paper or polybag and sizes of the cartons), Different calculations are available, but following instruction may provide an idea for us:

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