Abstract: A rail breakage detection device includes a first core part provided to a first cable connecting an electrical neutral point of an impedance bond that electrically connects a first rail and a second rail to the first rail, a second core part provided to a second cable connecting the electrical neutral point of the impedance bond to the second rail, a first coil wound around the first core part to generate a first electromotive force in accordance with a current variation occurring in the first cable, a second coil connected electrically to the first coil and wound around the second core part to generate a second electromotive force in accordance with a current variation occurring in the second cable, and a CPU to determine that the first or second rail is broken based on an electromotive force that is a sum of the first and second electromotive forces.

Abstract: A container of the present invention includes a bridging member disposed between a pair of inner side faces of a band insertion groove formed in a bottom wall. A rolling bearing is arranged above the bridging member and a band can be wound around the bearing and the bridging member together. Thus, since both a sideslip and jumping of the rolling bearing can be prevented without covers, the container is more superior in usability to a conventional container requiring a cover, and the stacking height can be suppressed as well.

Abstract: A container of the present invention includes a bridging member disposed between a pair of inner side faces of a band insertion groove formed in a bottom wall. A rolling bearing is arranged above the bridging member and a band can be wound around the bearing and the bridging member together. Thus, since both a sideslip and jumping of the rolling bearing can be prevented without covers, the container is more superior in usability to a conventional container requiring a cover, and the stacking height can be suppressed as well.

Abstract: There is provided a gas concentration-detecting device for detecting the concentration of gas in oil, which is capable of detecting the concentration of gas in oil with accuracy, irrespective of the temperature of oil, and even when oil is degraded. The gas concentration-detecting device includes two electrodes for being arranged in the oil such that the electrodes are opposed to each other and spaced from each other by a predetermined distance, and a capacitance amplifier for outputting a signal indicative of a concentration of gas in oil, the signal being dependent on a capacitance between the electrodes. The predetermined distance between the electrodes is set to a value equal to or larger than a predetermined value at which an amount of drift of the signal output from the capacitance amplifier dependent on variation in a temperature of the oil starts to gradually decrease as the distance between the electrodes is increased.

Abstract: A drive unit for driving an electrically-operated compressor mounted in an automotive vehicle is provided with a ventilation arrangement. The ventilation arrangement includes a casing having a vent hole defined therein. A filter having an air permeability and a water repellency is mounted on the casing so as to cover the vent hole. An elongated ventilation member is mounted on the casing so as to communicate with the vent hole and extends in a direction diverting from the direction in which the casing is splashed with water. The filter may be accommodated in the elongated ventilation member.

Abstract: The object is to prolong the life of a ball bearing by improving its ability to form oil films. A multitude of needle-like microscopic recesses are formed in a dispersed manner at random in the surface of each ball for a ball bearing. The recesses have a predetermined length and width and are present at a predetermined density so that the surface has a predetermined centerline average roughness.