Passive damper

A passive damper (1) for dampening relative movement between members (2,3) of a structure to which said damper (1) can be connected, said damper (1) comprising:

• at least a first set (7) of parallel disposed plates (7a),
• and a second set (8) of parallel disposed plates (8b,8c,8d),
• said first set (7) of plates and said second set (8) of plates overlap one another in an alternating fashion at a rotational joint with damping pads (15) between said plates (7a,8b,8c,8d), said rotational joint comprises a pin or bolt (9) inserted through apertures (15) in said plates (7a,8b,8c,8d),
• a connection hole (14b) in each of the plates of the second set (8) of plates for receiving a connection pin (6) therein for connecting the second set of plates (8) to one of said members (2,3),
• characterized in that
• said connection holes (14c,14d) in a selection of said plates (8c,8d) of said second set (8) of plates being shaped and dimensioned to provide a predetermined amount of clearance with said connection pin (6) so that said connection pin (6) can move inside the connection holes (14c,14d) of said selection of said plates (8c,8d) to a predetermined extent without said selection of plates (8c,8d) taking part in the damping action of the damper (1).