Adjustable-length compression spring and seat provided therewith

• Main Authors: BOHM WALTER, KNAUST HOLGER, KNAPP RAINER
• Format: Patent
• Language: English
• Published: 26.12.2006
• Subjects: BEDS; BLASTING; CHAIRS; COFFEE MILLS; DOMESTIC ARTICLES OR APPLIANCES; ENGINEERING ELEMENTS AND UNITS; FURNITURE; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HUMAN NECESSITIES; LIGHTING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; SEATS SPECIALLY ADAPTED FOR VEHICLES; SHOCK-ABSORBERS; SOFAS; SPICE MILLS; SPRINGS; SUCTION CLEANERS IN GENERAL; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDEDFOR; VEHICLES IN GENERAL; WEAPONS

A compression spring comprises a casing in which a piston is arranged for displacement, the piston being mounted on a piston rod. In the casing provision is made for two sectional casing chambers which are filled with pressure fluid, at least one of which being defined by the piston. A first operating valve, in an open position, connects the sectional casing chambers to each other and, in a shut-off position, blocks the compression spring. An additional throttle element ensures that an actuation and over-flow assembly between the sectional casing chambers is completely open only when the throttle element, with the valve pin tripped, is simultaneously moved by corresponding actuation into a position of release. Without any such actuation of the throttle element, there will be only throttled flow between the sectional casing chambers. Any inadvertent extension of the piston rod is thus precluded. This is an especially convenient and intuitive way of backrest adjustment in a seat.