Patent ID: 9260860
Filing Date: 2016-02-16
CPC Classification: E04B,E04H,F16F

Claim Text:
1. A passive damper for dampening relative movement between members of a structure to which said damper can be connected, said damper comprising: at least a first set of parallel disposed plates coupled to a first member of the structure, and a second set of parallel disposed plates coupled to a second member of the structure, the second set of parallel disposed plates comprising at least one first plate and at least one second plate; wherein said first set of parallel disposed plates and said second set of parallel disposed plates overlap one another in an alternating fashion at a rotational joint with damping pads between said first set of parallel disposed plates and said second set of parallel disposed plates, wherein said rotational joint comprises a pin or bolt inserted through apertures in said first set of parallel disposed plates and said second set of parallel disposed plates; a connection hole in each of the at least one first plate and the at least one second plate of the second set of parallel disposed plates for receiving a connection pin therein, the connection pin connecting the second set of parallel disposed plates including the first and second plates together and connecting the second set of parallel disposed plates to the second member of the structure; wherein a shape and size of the connection hole in the at least one first plate is dimensioned relative to the shape and size of the cross-section of said connection pin such that there is substantially no clearance between the connection hole in the at least one first plate and the connection pin; and wherein the connection hole in the at least one second plate is shaped and dimensioned to provide a predetermined amount of clearance with said connection pin so that said connection pin can move inside the connection hole in the at least one second plate to a predetermined extent when the at least one first plate moves without the at least one second plate taking part in the damping action of the damper.