Patent ID: 7891577
Filing Date: 2011-02-22
Classification: E01B

Abstract:
1. A derailment prevention guard comprises a guard member installed within a gauge and a support member fixed to a sleeper or a concrete slab track, wherein the guard member is held by a hold member which can turn around a central axis supported by the support member as turning center between a main rail and the inside of the gauge on the sleeper or the concrete slab track, and the support member is engaged with the hold member by means of an engaging member through turning the hold member toward the main rail around the central axis as turning center on the sleeper or the concrete slab track, and the guard member can be shunted inward within the gauge by turning the hold member toward the inside of the gauge around the central axis as turning center on the sleeper or the concrete slab track after disengagement of the engaging member; wherein the hold member is provided with a wire spring as freely engaging and disengaging hold means for holding the guard member; and wherein the wire spring comprises a first straight connecting portion extending from a first hook-shaped portion at one end and a second straight connecting portion extending from a second ok-shaped portion at the other end, and the first straight connecting portion is approximately in parallel with the second straight connecting portion in sight of plane, and both the first straight connecting portion and the second straight connecting portion are connected to a straight pushing down portion via a connecting portion looking like the Japanese cursive character “<”, and the connecting portion looking like the Japanese cursive character “<” comprises an outward obliquely upward extending lower portion looking like the Japanese cursive character “<” and an inward obliquely upward extending upper portion looking like the Japanese cursive character “<”, and both lower portions looking like the Japanese cursive character “<” are connected to the first and second straight connecting portions, and both upper portions looking like the Japanese cursive character “<” are connected to the straight pushing down portion.