Patent ID: 7766249

Claim:
In combination with a base in which an anchor sleeve defining an axis is imbedded and a plate lying on an upper surface of the base and on top of which rests a rail, a resilient anchor-bolt assembly comprising: an elastomeric buffer sheet between the rail plate and the base upper surface; a bolt set in the anchor sleeve, having a head, and passing axially through the rail plate and bearing downward on the plate; an insulating washer compressed vertically between the bolt and an upper surface of the rail plate; a rigid metal washer underneath the head and bearing downward on the insulating washer; a metallic inner ring surrounding and radially bearing directly on the bolt, having a lower end pressed axially downward by the bolt against the base surface, and having an annular radially outwardly directed outer surface; a metallic outer ring transfixed by the bolt, having an annular inner surface spaced radially outward from the inner-ring outer surface, having a lower end spaced mainly above the base surface, and bearing axially upward and radially outward on the rail plate; and an annular elastomeric body between the inner and outer rings and bonded to the respective outer and inner surfaces thereof, whereby vertical displacement of the outer ring relative to the inner ring is resisted largely as shear and lateral displacement largely as compression in the elastomeric body.