Three-point coupling device

US4944354A · kind A · utility

Assignee

• Jean Walterscheid GmbH · DE

Inventors

• Hans Langen · Frechen, DE
• Norbert Fartmann · Hannover, DE
• Herbert Coenen · Hennef (Sieg), DE

Key dates

• Filing date: Apr 6, 1989
• Grant date: Jul 31, 1990
• Expiry date: Apr 6, 2009

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01B71/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an three-point coupling device (3) for connecting a tractor to an implement (4). Two lower hitch arms (5, 5a) have been provided with catching hooks (7, 7a). An upper hitch arm (8) has also been provided with a catching hook (11). The lower hitch arms (5, 5a) may be raised or lowered by a power drive via lifting bars (10, 10a) and lifting arms (9, 9a). The upper hitch arm (8) is suspended from a holding device (20, 20a) which is associated with the lifting bars (10, 10a). As a result, the upper hitch arm (8) may be moved jointly with the lower hitch arms (5, 5a) upon actuation of the power drive which moves the lifting arms (9, 9a) and the lifting bar (10, 10a). It is no longer necessary for the tractor driver to hold the upper hitch arm (8) himself and place it on the upper coupling point (14) of the implement (4).