Abstract: A device for clearing pipe blockage includes: pumping means (A) for compressing air by pumping and having an outlet (18) for discharging compressed air out; and an inflatable balloon mounted at the outlet and expanding by air discharged through the outlet. The outlet is a one-way valve, and a cylindrical guide member (24) is formed to surround the outside of the inflatable balloon, guides the inflatable balloon to move forward inside a pipe when a front end part of the guide member is inserted into the pipe, and is made of flexible material. A presser which cleans the inner surface of the pipe while moving in a state where it gets in contact with the inner surface of the pipe is mounted at a front end of the inflatable balloon, and the blocked pipe is cleared by shock pressure by movement of the pumping unit and a change in pressure by expansion of the inflatable balloon by the compressed air.

Abstract: A railroad car wheel is designed to have an amount of displacement of 40 mm or larger, this amount being the amount of displacement of a rim portion relative to a boss portion of the wheel which is the distance between two lines perpendicular to the axis of the wheel, one from the midpoint of the thickness of a plate portion adjacent to ends of curves of the rim fillets and the other from the midpoint of thickness of the plate portion adjacent to ends of curves of the boss fillets.

Abstract: A railway wheel of lightweight construction, having a disc-like wheel body and a tire which is tension-mounted on the wheel rim, and with the wheel disc including a tangential undulating or wavelike configuration of radially extending crests and troughs. In the railway wheel, between an inner annularly extending groove formed in the wheel tire and an outer annular groove formed in the wheel rim, there is provided a pre-tensioned or pre-stressed rubber insert, and in which the wheel disc has a radially unwaved conical basic configuration.