| 摘要 |
A rail construction for rail-type electrification systems, comprising a metal, conducting carrier rail member of relatively high expansion coefficient, having a cross-sectional configuration somewhat like a pair of channel shapes disposed back-to-back. One channel shape is used for suspension or mounting, as well as rigidity. The other channel shape contains a metal insert in the form of a flat contact member of relatively low expansion coefficient which is secured in place by being pinched between opposed wall areas of flanges of the rail member, in consequence of the flanges being swaged or displaced beyond their elastic limit to effect a gripping of the contact member. The inner walls of the flanges, which adjoin the elongate contact member, constitute metal guideways that assure a positive tracking of the collector shoe. Any small relative movement between the conducting rail member and the metal insert, as occasioned by temperature changes for example, cannot result in permanent distortion of the carrier rail member and consequent loosening of the insert or deterioration of the electrical conductance thereto. The carrier rail member can be provided with a skin-tight jacket of insulation that is coextensive with the member and capable of accommodating mounting clamps at any desired locations.
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