Corner arrangement for frame sections

A frame assembly comprising two frame sections (1, 2) located at an angle with respect to each other, said frame sections each having a respective abutment surface for positioning adjacent the abutment surface of the other frame section, a corner arrangement for securing the frame sections together, said corner arrangement including a corner piece (3) having two legs (3a, 3b) located on angle to each other, said frame sections (1, 2) each having a longitudinal groove (5) for receiving a respective leg (3a, 3b) of the corner piece (3), said corner piece legs (3a, 3b) each having at least one locking screw (4) for locking the corner piece (3) to the frame sections (1, 2), said at least one locking screw (4) having a tapered end which comprises at least a portion of a cone, and said frame sections (1, 2) each having a counter surface (8) inclined relative to a respective at least one locking screw (4) such that rotation of the locking screw (4) to a locking position forces the frame section abutment surfaces together.