| 摘要 |
An improvement in rail threading devices having at least four rollers mounted on two rectangular plates. Each rectangular plate is fastened by a stud to a framing member which allows movement of the rectangular plate relative to the framing member. The framing members are mechanically attached together so that the rollers will straddle a section of rail and grip the rail from the underside of the rails' upper section when the device is lifted by a crane. The mechanical attachment of the framing members is such that the device can be used to lift a rail which is on the ground and further allow the rollers to be separated when the tension on an attached crane cable is relaxed thereby providing for ease in removal or attachment of the device.
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