Machine element or mechanism – Gearing – Plural prime movers selectively coupled to common output
Reexamination Certificate
2007-02-06
2007-02-06
Pang, Roger (Department: 3681)
Machine element or mechanism
Gearing
Plural prime movers selectively coupled to common output
C074S352000, C074S732100, C060S788000
Reexamination Certificate
active
10963360
ABSTRACT:
In a system in which a large motor, to be energized from a power grid, is connected to drive a main fluid drive through a main impeller shaft that has a main impeller shaft gear mounted on it, a relatively small start-up motor is provided, driving a start-up fluid drive. A start-up gear is connected to be driven by the start-up fluid drive and selectively to drive the main impeller shaft gear, and to be disengaged from the main impeller shaft gear. In operation, the small motor is first started, with the start-up gear engaging the main impeller shaft gear, and brought up to a speed at which the large motor begins to rotate at close to synchronous speed with the electrical frequency of the grid, at which point the large motor is connected to the grid.
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patent: 5505662 (1996-04-01), Giberson
patent: 6640917 (2003-11-01), Maruyama
patent: 6848329 (2005-02-01), Okada et al.
Pang Roger
Polster Lieder Woodruff & Lucchesi L.C.
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