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    • 7. 发明公开
    • Maximum demand meter
    • Maximumzähler。
    • EP0095687A1
    • 1983-12-07
    • EP83105053.9
    • 1983-05-21
    • MITSUBISHI DENKI KABUSHIKI KAISHA
    • Takeshita, Shigeki
    • G01R11/64G01D4/10
    • G01R11/64G01D4/10
    • A maximum demand meter comprises a driving part for transmitting a rotation depending on a consumed electric energy, a differential gear mechanism (36) comprising a first sun gear (38) rotated by the driving part in a predetermined direction, a second sun gear (41) driven in the opposite direction of the rotation of the first sun gear and a planet gear (39) for transmitting the rotations of the first and second sun gears to a push arm (50) for moving a pointer (19), a zero-returning driving means (44-47) for rotating the second sun gear (41) of said differential gear mechanism in a predetermined direction and an engaging pawl means (52, 53) for inhibiting either of the first and second sun gears of the differential gear mechanism from rotating in a predetermined direction. In normal state, the engaging pawl means (52, 53) inhibits the second sun gear (41) from rotation and allows the rotation of the first sun gear (38) to rotate the planet gear (39) thereby to forwardly move the push arm (50) and at a demand time, the engaging pawl means inhibits the first sun gear from the rotation and allows the second sun gear (41) to rotate and the zero-returning driving means (44-47) drives the second sun gear (41) to rotate the planet gear (39) thereby to return the push arm (50) to the zero position.