Appeal No. 1997-2162
Application 08/280,430
opening or closing of the sensor switch stops the ascent of
the car.
Representative independent claims 1, 7, 18, and 22 are
reproduced as follow:
1. 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; and
a dock plate attached to said car at said one end and
rotating about a horizontal axis, wherein said dock plate is
approximately vertical when said gate is closed and said dock
plate is mechanically linked to said gate whereby said dock
plate is lowered to an approximately horizontal position as
said gate is opened.
7. In a mobile lifting device including a vertically
movable car and an electro-mechanical jack for raising or
lowering said car, the control system comprising:
a first circuit for causing said jack to raise said car;
a second circuit for causing said jack to lower said car;
wherein said first circuit includes a first switch
controlled by said second circuit and said second circuit
includes a second switch controlled by said first circuit,
whereby operating one of said first and second circuits
prevents the other of said first and second circuits from
operating;
3
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