headchair

名词 n.
中文释义

英文释义

名词 n.
  1. Part of a block switch on a railway line that the ends of the moveable rails rest on, and to which the stationary rails are attached.
    — I desire to be understood'as disclaimin g the broad features, first, of making a railway headchair with bearing-cheeks of different heights, one for the flange and the other for the tread of a car-wheel, whereby, in passing over theswitch on either the main or the side track rail, the wheel will have bearing upon respective cheek of the chair; and, second, of providing such side bearings with detachable wearing surfaces, either inclined, plane, or grooved.

词形变化

headchairs plural

词源

From head + chair.
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