Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Reexamination Certificate
2005-02-28
2008-09-09
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
C254S418000, C254S423000, C254S424000, C254S425000, C318S135000
Reexamination Certificate
active
07423392
ABSTRACT:
A trailer jack system includes an electric linear actuator having an electric motor, a source of electric power, and a controller that supplies a first voltage to the electric motor when the electric linear actuator is loaded and a second voltage to the electric motor when the electric linear actuator is unloaded. The electric linear actuator also includes a cylindrically shaped housing, a leg coaxially extending and retracting from the housing, and a support foot at a free end of the leg. The controller supplies the first voltage to the electric motor when a motor current of the electric motor is below a predetermined threshold value and supplies the second voltage to the electric motor when the motor current is above the predetermined threshold value. Preferably, the first voltage is about 24 volts and the second voltage is about 12 volts.
REFERENCES:
patent: 4307799 (1981-12-01), Zouzoulas
patent: 6614195 (2003-09-01), Bushey et al.
patent: 6695289 (2004-02-01), Mickael
patent: 2006/0102578 (2006-05-01), Zakula et al.
Atwood Mobile Products LLC
Brandt Michael
Donovan Lincoln
Porter Wright Morris & Arthur LLP
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