Abstract:
Apparatus to isolate an object or equipment from earthquake motion comprises: (a) rollable bearing means supporting such structure for lateral motion generally parallel to a support; (b) and other means including interengaged bowl and roller elements to yieldably resist such lateral movement of the structure. Typically, the bowl element defines a bowl-shaped surface having an upright axis, and the roller element comprises a ball urged into engagement with that surface to exert lateral load on the object or equipment when the ball engages the bowl surface in laterally spaced relation to the bowl axis, one of the elements carried by the object or equipment to move laterally therewith and the other element carried by the support.