Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1993-05-20
1995-06-06
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
200 6A, 74471XY, 414 4, E02F 920
Patent
active
054216940
ABSTRACT:
A non-contacting joystick includes a control shaft being universally movable about a Z-axis. A spherical conducting body is attached to an end of the control shaft. A plurality of conducting plates are disposed circumjacent to the spherical body. A charging power supply supplies electrical energy of a first polarity to the spherical body and electrical energy of a second polarity to the plurality of conducting plates. Each conducting plate forms a variable capacitor with the spherical body. The capacitance value of each variable capacitor is a function of the displacement of the spherical body relative to the Z-axis. A circuit produces a plurality of position signals, each position signal being responsive to a capacitance value of a respective variable capacitor. The position signals indicate the relative position of the spherical body.
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Hydraulics & Pneumatics, Jun. 1988, "What's Behind That Joystock?", by: D. D. Schumann, P.E.
Baker Thomas M.
Codina George
Franzen Larry H.
Szentes John F.
Caterpillar Inc.
Masterson David M.
Underwood Donald W.
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