Device for interconnection of two objects

A device for fastening together two parts, comprising:

• a first part which comprises:
• a first frame carrying a screw which has a conical, pointed first end section having a longitudinal axis, said screw being rotatable, but axially immovable in relation to the first frame;
• an internally threaded piece mounted axially movable but rotatably immovable in the first frame for receiving said screw;
• at least one engagement element mounted in the internally threaded piece, and having a first contact section arranged to abut against the end section, the engagement element being movable relative to the end section in the direction of the end section's longitudinal axis, the engagement element being also movable radially in relation to the end section between a first position, wherein the distance between the longitudinal axis and the engagement element's radially outer end is minimal, and a second position, wherein said distance is at a maximum;
• a second part which comprises:
• a second frame having an opening with a narrowed section which forms a shoulder section, and through which the engagement element can be inserted when located in the first position, and said narrowed section being arranged to engage with a second contact section of the engagement element when the engagement element has passed through the opening and is located in the second position;
• said screw comprising an externally threaded sleeve surrounding a stem part which is rotationally fixed in relation to the sleeve and which comprises the first end section, said stem part being axially movable relative to the sleeve;
• and retaining means for preventing an unintentional relative axial movement.