Seat having an adjustable back support arrangement

US4601514A · kind A · utility

Assignee

• Messrs. Willibald Grammer · DE

Inventor

• Hermann Meiller · Wernberg-Köblitz, DE

Key dates

• Filing date: Jan 6, 1984
• Grant date: Jul 22, 1986
• Expiry date: Jan 6, 2004

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A47C7/462
• WIPO field: Furniture, games
• WIPO sector: Other fields

Abstract

The seat has a backrest with a back support integrated therein, comprising a curved spring plate member which bears against the rear of the backrest cushion. The distance, as measured in the heightwise direction of the backrest, between the upper and lower edges of the spring plate member can be adjusted by manual or motor-driven means to vary its curvature and the resistance to bending of the spring plate member is lower in its lower region than in its upper region whereby, when the distance between its upper and lower edges is progressively reduced, the spring plate member initially becomes more curved in its lower region until a restricting means comes into action to limit that initially produced increase in curvature, with the result that the curvature in the upper region is then increased.