Suspa Federungstechnik Fritz Bauer & Sohne Ohg

Ludwig Stadelmann

Fritz Bauer

A lengthwise-adjustable, compressed-gas-filled gas spring, particularly for continuous height adjustment of chairs, seats, tables, or the like, has two cylinders, coaxially mounted one inside the other, and leaving an annular chamber therebetween. A piston and piston rod are displaceably provided within the inner cylinder, the piston sealingly dividing the cylinder into a first housing chamber, on the piston rod side, and a second housing chamber. The piston rod extends sealingly out of the cylinders. The first housing chamber has a fluid connection to the annular chamber at all times. The inner cylinder has a passageway therethrough near the end opposite the piston rod end, and is axially displaceable within the center cylinder between a first position at which the passageway is sealed off and a second position at which a fluid connection is allowed between the second housing chamber and the annular chamber.

Lengthwise-adjustable gas spring

An adjustment assembly has two coaxially mounted cylinders fitting into one another with a piston displaceably mounted within the inside cylinder and dividing the inside cylinder into two fluid filled housing chambers. The piston is connected to a piston rod which is guided out of one end of the cylinder in a sealed manner. A pressure medium chamber is provided in the annular space between the cylinders and is separated in a fluid tight manner from fluid filled parts of the annular space by two axially displaceable separating pistons. The lower housing chamber has a fluid passageway to the lower portion of the annular space and the upper housing chamber has a fluid passageway to the upper part of the annular space. The inner cylinder may be axially displaced from outside the assembly to seal or open the upper passageway thus locking or unlocking the piston.

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Altdorf, Germany

Ludwig Stadelmann