FIELD: machine building.
SUBSTANCE: group of inventions relates to excavating tools and elements of their attachment. Fixing assembly for attachment of the excavating working element to the bucket includes a fixture with a working axis, a turning surface made on the bucket and oriented to the other side from the cutting edge of the bucket, a cutout for receiving the fixture. Cutout for receiving the retainer is made on the excavating working element, has an inlet on the outer surface and is made elongated along the axis. Inlet has a length along the axis which is less than that of the cut itself. Retainer is made with a section of engagement with the bucket and a section of engagement with the excavating working element and with a length along the axis which is greater than at the inlet of the cutout for receiving the retainer. In addition, the fixing unit provides movement of the excavating working element relative to the bucket between: first position, in which the retainer is located so that the engagement section with the bucket rests against the turning surface of the bucket, and section of engagement with excavating working element passes through inlet of cutout for receiving retainer, and a second position in which the retainer is located inside the recess for receiving the retainer, wherein the engagement portion with the bucket rests against the turning surface of the bucket, and the engagement section with the excavating working element rests against the supporting surface of the excavating working element. Design of the fixing unit allows the fixture to turn around the surface of the bucket turn during movement of the excavating working element between its first and second positions.
EFFECT: reliability and durability of system of attachment of elements of protection of excavating tool.
23 cl, 30 dwg
