Adjustable-length compression spring and seat provided therewith

US7152719B2 · kind B2 · utility

Assignee

• SUSPA GMBH · DE

Inventors

• Holger Knaust · Neuenburg am Rhein, DE
• Rainer Knapp · Oxford, US
• Walter Bohm · Leverkusen, DE

Key dates

• Filing date: Oct 19, 2004
• Grant date: Dec 26, 2006
• Expiry date: Oct 19, 2024

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60N2/231
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

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.