Coupling hook for the lower steering arms of a three-point attaching device of a tractor

US5441117A · kind A · utility

Assignee

• GKN Walterscheid GmbH · DE

Inventors

• Norbert Fartmann · Hannover, DE
• Joachim Laubner · Adenau, DE
• Norbert Muller · Tamm, DE

Key dates

• Filing date: Oct 22, 1993
• Grant date: Aug 15, 1995
• Expiry date: Oct 22, 2013

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01B59/006
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A coupling hook (5) for the lower steering arms (3) of a three-point attaching device of a tractor has a hook body (6) with a locking pawl (7). The pawl (7) is spring-loaded in the direction of the locking position. The locking pawl (7) is arranged in a recess (12) of the hook body (6) and projects through an aperture (13) into a bearing recess (10), which receives a bearing ball (11). For the purpose of supporting and guiding the locking pawl (7), the hook body (6) includes a first stop face (14), a second supporting stop (15) offset backwardly at a distance therefrom and a locking stop (16). In the locking position, the locking pawl (7) is supported on the looking stop (16) via a first supporting face (19), a second supporting face (21) and a locking face (22). The design is such that the contact between the locking face (22) and the locking stop (16) takes place below an imaginary connecting line (27) which is between the point of contact of the locking face (25) of the locking pawl (7) with the outer face (26) of the bearing ball (11), on the one hand, and the center (29) of the convex locking stop (16) on the other hand. An improved locking affect is ensured.