Assembly for detachably mounting a tool on a driving member

Assembly for detachably mounting a tool on a driving member, comprising:

• a tool carrier,
• a mounting head for connecting the tool carrier to the driving member, the mounting head including at least one seat surface being cooperatively engaged with a corresponding portion of the tool carrier,
• a device for holding the tool carrier in contact with the seat, and
• means for positioning the mounting head in a specific position relative to the tool carrier when the tool carrier is held by the holding device, the positioning means including:
• at least one stop member preventing displacement of the tool carrier on the seat,
• abutment members disposed in a specific direction for preventing displacement of the tool carrier on the seat in any path transverse to said direction, and
• at least one thrust member acting on the tool carrier in a direction for holding the tool carrier in permanent contact with the stop member in said specific position with respect to said mounting head,
• said mounting head being formed by a body having at least a portion of an external surface hollowed out by a recess, said recess having a base, longitudinal side walls, a top wall and being open at one end thereof, at least a portion of the base of the recess forming said seat, at least a portion of the longitudinal side walls of the recess forming said abutment member, at least a portion of the top wall of the recess defining the other end of said recess forming said stop member,
• said tool carrier including a plate portion having a shape which substantially corresponds to the shape of said recess of the mounting head, a first end of said plate portion being in contact with said stop member.