Abstract: An energy absorbing bearing with a primary application in the seismic isolation of structure from the ground or parts of other structures. It may also be used to dampen other forces on structures on which it is installed. The bearing consists of end plates separated by a laminate of resilient and stiffening layers. There is a plastically deformable insert within the laminate. The laminate interfaces with the end plates in each bearing and is secured near the central axis from end plate to end plate, but not near the peripheries. The advantage provided is allowing a wider range of forces to be absorbed than with known bearings of this type.

Abstract: The invention described is a system for seismic isolation or vibration of structures which is simple, relatively inexpensive and readily used for smaller structures. It involves use of bearings comprising a ball (10) and ball seats (12, 18) interposed between the structure and its foundation. Either the ball itself (24) or the seat surface (15) on which it rolls is compressible, the resistance to that compression providing a frictional braking force resisting rolling of the ball. This serves to dampen relative movement between the structure and its foundation. There are described several alternative constructions of the friction ball which is the preferred central element in the bearing device. There may be a plurality of balls (44, 47) in each combination of balls and seats.

Abstract: An energy absorber including a pair of shear dampers mounted back to back on a common axis. Each shear damper has a central core of damping material, confined by a laminated structure of rigid plates, preferably separated by resilient material. The cores and surrounding laminates are compressed between a pair of distal end plates and an end plate common to both dampers. The common end plate may be attached to one structural member and the distal end plates to another structural member to dampen relative motion between them.