A gas lift chair is a form of office chair

Office chair

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It should be comfortable and adjustable and can swivel 360 degrees.-History:...

 that allows the user to modify their height in relation to the height of a desk, leading to an increase in comfort and ergonomic benefit.

The concept of using a gas spring

Gas spring

A gas spring is a type of spring that, unlike a typical metal spring, uses a compressed gas, contained in a cylinder and compressed by a piston, to exert a force. Gas springs are used in automobiles, where they are incorporated into the design of struts that support the weight of hatchback doors...

 to aid the adjustment of chairs is described in patent , issued in 1972 to Drabert Soehne of Minden

Minden

Minden is a town of about 83,000 inhabitants in the north-east of North Rhine-Westphalia, Germany. The town extends along both sides of the river Weser. It is the capital of the Kreis of Minden-Lübbecke, which is part of the region of Detmold. Minden is the historic political centre of the...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

and cites the inventor as Drabert Fritz. Nearly all gas cylinders are 28 mm (1.102 inches) in diameter, a worldwide standard.Gas Cylinder diameter:http://www.swivel-chair-parts.com