Air-sprung seat

US4484723A · kind A · utility

Assignee

• Willibald Grammer · DE

Inventors

• Hermann Meiller · Wernberg-Köblitz, DE
• Johann Grassl · Schwandorf, DE

Key dates

• Filing date: Feb 1, 1982
• Grant date: Nov 27, 1984
• Expiry date: Feb 1, 2002

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60N2/914
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An air-sprung vehicle seat wherein adjustment in respect of weight is provided by a control cam and two spaced-apart switches actuable thereby upon relative movement thereof in dependence on a variation in the seat height. One of the switches controls the supply of air into the air spring and the other the discharge of air therefrom. The switches each have two actuating stages such that, with increasing actuation, the first actuating stage serves as an idle stage and it is only in the subsequent second actuating stage that the respective switch is switched on, while, with decreasing actuation, a switch which has been switched on remains switched on until both actuating stages have passed. The control cam has two control portions such that, in both directions of actuating movement, the control portion which moves the respective switch being actuated into the first actuating stage is operative first and it is only upon further movement in the same direction that the second control portion is operative to move the respective switch into its second actuating stage. This arrangement reliably prevents a continuous air supply to and discharge from the air spring, due to the seat oscillati…