| 摘要 |
<p>The invention is a new knife (1) for rotating harrows on vertical axles having notchings (12) on the connection part (11) placed from the normal position of the holes for the screws to one of the edges of said connection part (11). The knife (1) is assembled inserting it to 'bayonet connection' between the fastening screwheads, which have been loosened, and the plain part of the rotor on which the knife (1) is fixed. The notchings (12) can have rectilinear, arcuate or stairs shape; the shape of the notchings (12) can, in combination with the bent stop plates (3) which are placed on the stairs of the notchings (12) or on the slots of the connection part of the knife (1), prevent the knife from unscrewing.</p> |
