Structural bearing

A structural bearing subjected to loads having vertical, horizontal, rotational and torsional components comprising:

• a) a first, rigid-support member, defined by a first perimeter, for mounting on a structure on which the bearing is supported;
• b) a first layer of elastomeric material centrally mounted on top of said first, rigid-support member having a second perimeter that is short of said first perimeter;
• c) a second rigid member mounted on top of said first layer of elastomeric material and defined by a third perimeter extending beyond said second perimeter;
• d) a plurality of pins rigidly attached to one of said support members, outboard of said second perimeter and inboard of said first and said third perimeters and extending across and through complimentary bores formed in said other support member;
• e) said pins containing means restricting movement of said support member through which they extend from sliding further from said first layer of elastomeric material;
• f) a ring-shaped layer of a second elastomeric material interposed said means of each said pin and said second rigid member for cooperating with said first layer of elastomeric material to share the physical load imposed on said bearing;
• g) a third layer of elastomeric material centrally mounted on top of said support member through which said pins extend;
• h) a third, rigid-support member for operative engagement with a structure supported by the bearing mounted on top of said third layer of elastomeric material and defined by a second perimeter extending beyond said perimeter of said second rigid member;
• and,
• i) a wall extending from said perimeter of said third, rigid-support member downward toward and about said second, rigid-support member to restrict the horizontal movement of said third support member.

A structural bearing subjected to loads having vertical, horizontal and torsional components comprising:

• a) a first, rigid-support member for mounting on a structure on which the bearing is supported;
• b) a first layer of elastomeric material mounted on top of said first, rigid-support member;
• c) a second rigid member, defined by a perimeter, mounted on top of said first layer of elastomeric material;
• d) a pin of finite length and terminated by spaced-apart distal ends rigidly attached at one said distal end to one of said rigid members and extending through said first layer of elastomeric material toward said other rigid member;
• e) a ring extending, from said support member to which said pin is not attached, toward and surrounding said other distal end of said pin and spaced-apart therefrom and further extending at least partially about the free end of said pin to form a cavity thereabout;
• f) a first, ring-shaped layer of of elastomeric material in said cavity restrained between said ring and said pin and in contact with said first layer of elastomeric material for sharing the components of the vertical, horizontal, rotational and torsional loads on the bearing;
• g) a third, rigid-support member for operative engagement with a structure supported by the bearing mounted on top of said second rigid member;
• h) a layer of low-friction, elastomeric material interposed said second rigid member and said third, rigid-support member for allowing horizontal intermovement therebetween due to earthquake loads;
• i) said third support member defined by a perimeter greater than said perimeter of said second rigid member;
• j) a ring-shaped wall extending from said perimeter of said third, rigid-support member toward and about said perimeter of said second rigid member and spaced-apart therefrom;
• and,
• k) a second, ring-shaped layer of elastomeric material interposed said wall and said perimeter of said second rigid member for damping the horizontal movement in the bearing caused by said transient loads impressed thereon.