Detachable connecting unit for connecting hopper and arm of digging excavator that is utilized for construction works, has retaining device with sheet metal plates whose thickness in area of hook is smaller than distance between plates

摘要

The connecting unit has a retaining device with two sheet metal plates arranged at a distance from each other. A bolt (2) runs between the plates, and a hook (14) is rotatably fastened at a support frame, where the hook has an area (20.1) with a height (11) that extends till half diameter of the bolt. The hook has another area (20.3) with an extension length (12), and a boundary of a hook plate at the extension length in a contact area to the plates is formed as a straight line. Thickness of the plates in the latter area is smaller than the distance between the plates.