Support for antiseismic protection

Abstract

This seismic protection support comprises a lower supporting base that is intended to be rested or fixed on the ground, an upper table intended to carry an object to be protected against an earthquake, and a mechanical connection system between the supporting base and the table. The mechanical system comprises at least one pantographic arm, with a succession of inner links and outer links connected together by pin elements; the first link of the succession is hinged to the supporting base through a base pin element and the last link of the succession is hinged to the table through a table pin element. In such a way, the table is free to move with respect to the base between a predetermined initial position and a plurality of final positions. In the case in which there is an earthquake, while the supporting base is moved by the earthquake itself, the table tends to remain in its previous position.

1 . Seismic protection support, comprising a lower support base intended to be rested or fixed on the ground, an upper table intended to carry an object to be protected against an earthquake, a mechanical connection system between the supporting base and the table, characterised in that the mechanical system comprises at least one pantographic arm, with a succession of inner links and outer links connected together by pin elements, wherein each outer link comprises an upper rod and a lower rod that are parallel to one another, wherein the first link of the succession is hinged to the supporting base through a base pin element and wherein the last link of the succession is hinged to the table through a table pin element, so that the table is free to move with respect to the base between a predetermined initial position and a plurality of final positions. 
     
     
         2 . Support according to  claim 1 , wherein the mechanical system comprises at least two pantographic arms. 
     
     
         3 . Support according to  claim 2 , wherein the mechanical system comprises at least three pantographic arms. 
     
     
         4 . Support according to  claim 3 , wherein the mechanical system comprises four pantographic arms. 
     
     
         5 . Support according to  claim 1 , wherein the pin elements of the pantographic arm, the base pin element and the table pin element are provided with combined rolling bearings, of the type suitable for sustaining axial loads. 
     
     
         6 . Support according to  claim 1 , wherein each inner link comprises an upper rod and a lower rod, parallel to one another. 
     
     
         7 . Support according to  claim 2 , wherein the mechanical system comprises a single pair of intermediate flanges fixed to the base or to the table, the base pin elements or the table pin elements, respectively, of each pantographic arm being carried by the pair of intermediate flanges. 
     
     
         8 . Support according to  claim 1 , wherein the mechanical system comprises at least one elastic return member, to bias the table towards its initial position. 
     
     
         9 . Support according to  claim 8 , wherein the elastic return member comprises torsion springs applied to at least some of the pin elements of the arm and/or of the base and/or of the table. 
     
     
         10 . Support according to  claim 8 , wherein the elastic return member comprises traction springs applied between the table and the supporting base. 
     
     
         11 . Support according to  claim 1 , wherein the mechanical system comprises at least one damping member, to brake the movement of the table away from its initial position. 
     
     
         12 . Support according to  claim 11 , wherein the damping member comprises linear dampers applied between the table and the supporting base. 
     
     
         13 . Support according to  claim 11 , wherein the damping member is of the variable damping type, in which the braking action is linked not only to the speed of movement but also to the extent of the movement.