Appeal No. 1997-2162
Application 08/280,430
a power supply for converting alternating current into
direct current at a low voltage, wherein said first circuit
and said second circuit are powered by said direct current.
18. A mobile lifting device comprising:
a car having fixed sides and a first gate at one end of
said car;
a wheeled chassis;
a jack coupled to said car and said chassis for raising
and lowering said car relative to said chassis;
a dock plate attached to said car at said one end and
rotating about a horizontal axis; and
a stage height sensor for stopping said car at any point
within a continuous range of movement, said sensor including
an electrical switch, said switch having a wand extending from
said sensor, wherein said car includes a knob attached to one
of said sides and said knob engages said wand to actuate said
switch when said car is raised to a predetermined height
relative to a stage.
22. A mobile lifting device comprising:
a car having fixed sides, a first gate at one end of said
car, and a second gate at a second end of said car;
a wheeled chassis;
a power supply for converting alternating current into
direct current at a low voltage;
an electro-mechanical jack coupled to said car and said
chassis for raising and lowering said car relative to said
chassis, said electro-mechanical jack including an electric
motor powered by said alternating current;
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