| 摘要 |
Improved shoulder insulator for a rail seat assembly which enables the rail seat to be pre assembled at the rail tie fabrication plant into a preloaded position where a rail can be laid on the tie on site. On site the rail clips can be moved to the loaded position after the rail is placed in position. The rail seat includes a concrete rail tie; a pair of rail clip support shoulders cast in place in said rail tie each said shoulder having a rail face between its external sides; a pair of shoulder insulators each shaped to lie against the rail face of the rail shoulder; a pair of rail clips each having a base section adapted to seat within the rail clip support shoulder and a toe section adapted to seat on the rail base, the toe section comprising a pair of bifurcated arms extending from said base section and being bent in a curve so that the toes lie adjacent but beyond the base; a pair of toe insulators each adapted to fit about the toe of the rail clip to insulate the clip from the rail base; the arrangement being such that when the rail clip is in the preloaded position the toe insulator and the toe of the clips do not project beyond the face of the shoulder insulator so that a rail can be laid between the rail shoulders and their associated insulators. The shoulder insulator is shaped to lie against the rail face of the rail shoulder level with the gate of the shoulder and abutting the location flange and incorporating side arms that slip over the external retention rib of the shoulders which is dimensioned so that when the shoulder insulator top is pulled toward the rail and lifted up, the side arms clear the retention clips and the top edge of the shoulder insulator post clears the front of the toe insulator
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