Electricity: motive power systems – Braking – Plural – diverse or diversely controlled braking means
Reexamination Certificate
2005-03-31
2010-02-09
Benson, Walter (Department: 2837)
Electricity: motive power systems
Braking
Plural, diverse or diversely controlled braking means
C318S362000, C318S372000, C318S375000, C318S461000
Reexamination Certificate
active
07659677
ABSTRACT:
To stop, in an emergency, a revolving superstructure quickly from rotating while preventing damage of a mechanical brake. A revolving superstructure is driven swiveling using a permanent magnetic-type swiveling electric motor; in an emergency, such as a malfunction in a drive or control system for the swiveling electric motor, allowing electric power generated in the electric motor due to inertial rotation to be consumed in an external braking resistor so as to make an electric braking action; and a mechanical brake is activated to stop the rotation and hold the stopped revolving superstructure when a rotation speed of the revolving superstructure becomes equal to or lower than a preset value.
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Inoue Koji
Komiyama Masayuki
Sugano Naoki
Yoshimatsu Hideaki
Benson Walter
Colon Eduardo
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd).
Kobelco Construction Machinery Co., Ltd.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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