Patent ID: 6373216
Filing Date: 2002-04-16
Classification: H02P

Abstract:
A system for deploying and retracting an on-board display unit, comprising:a motor coupled to said display unit, said motor disposed to deploy the display unit in a forward direction, and said motor disposed to retract said display unit in a reverse direction; a motor voltage source coupled to said motor, said motor voltage source disposed to drive said motor to one of said forward and said reverse directions; a storage capacitor coupled to said motor voltage source, said storage capacitor disposed to store energy during operation of said motor, said storage capacitor disposed to discharge its energy when said motor voltage source malfunctions to drive said motor in said reverse direction, such that said motor still retracts said display unit in the absence of power from said motor voltage source, and a directional relay coupled to said motor, said directional relay disposed to switch the polarity of said motor between forward-driving and reverse-driving as controlled by said directional relay being in one of an energized and de-energized state, respectively, said directional relay disposed to be normally in said de-energized state in the absence of power from said motor voltage source.