OF THE DISCLOSURE A gas Spring for a drawing table which has a cylinder, a piston in the cylinder, and a piston rod projecting from the piston through one end wall of the cylinder, the other end wall being imperforate. Gas under pressure fills the cylinder and may be released from the chamber adjacent the piston rod if the latter is almost fully expelled from the cylinder against a compression spring through a chan nel having orifices in the piston and in the piston rod. Additional gas is admitted to the cylinder of a modified Spring when the piston rod is almost fully retracted into the cylinder and the piston strikes a normally closed valve Separating the cylinder cavity from a storage chamber.
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