Patent ID: 8646976
Filing Date: 2014-02-11
Classification: E01D,E04B,E21B

Abstract:
1. A structural bearing apparatus comprising: (a) a lower bearing plate having a planar upper surface; (b) an upper bearing plate having a planar lower surface, said upper bearing plate being positioned such that said planar lower surface is above and parallel to the upper surface of the lower bearing plate; (c) lateral displacement means comprising roller means, said lateral displacement means being disposed between the lower and upper bearing plates with said roller means in direct rollable contact with the planar upper surface of the lower bearing plate and with the planar lower surface of the upper upper bearing plate, whereby when the upper bearing plate is subjected to a lateral load acting in a first direction: (d) centering means, for returning the upper bearing plate and the first lateral displacement means to their neutral positions upon removal of the lateral load.