Patent ID: 9004372
Filing Date: 2015-04-14
Classification: E01B

Abstract:
1. A bonded, direct fixation fastener as supportive structure for a rail on a railroad tie or bed comprising: a rail plate, wherein the rail plate has a generally horizontal center portion having a lower face and an upper face and defining a rail plate horizontal plane, and wherein the rail plate center portion extends at a first angle from opposing sides as rail plate tongues above the rail plate horizontal plane, the rail plate having a rail securing device; a bed plate comprising a generally horizontal center portion, an upper bed plate face defining a bed plate horizontal plane, and a pair of opposing bed plate tongues extending from opposing sides of the bed plate horizontal center portion disposed at a second angle above the bed plate horizontal plane; a horizontal elastomeric portion of relatively lower hardness encapsulating at least a portion of the bed plate and at least a portion of the rail plate; and vertical elastomeric portions of relatively higher hardness encapsulating at least a portion of each bed plate tongue and at least a portion of each rail plate tongue, and surrounding the upper face of the rail plate; wherein each vertical elastomeric portion is physically continuous with the horizontal elastomeric portion; wherein each rail plate tongue has an interior face and an exterior face and a tongue plane midway between the interior face and the exterior face; the rail plate horizontal plane is located between the rail plate lower face and rail plate upper face; a third plane defined by a line intersecting the rail plate horizontal plane and extending below the rail plate horizontal plane wherein an angle between the rail plate horizontal plane and the line is less than or equal to about 45 degrees; wherein the third plane defines a boundary between the vertical elastomeric portions and the horizontal elastomeric portion; and wherein the horizontal elastomeric portion has a relative durometer at least 5 lower than the durometer of the vertical elastomeric portion.