Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1988-07-20
1990-04-17
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
B62D 506
Patent
active
049172042
ABSTRACT:
A materials handling vehicle having two pairs of ground wheels movable to effect steering of the vehicle, the wheels of each pair being mounted at opposite sides of the vehicle chassis, at least one pair of wheels being lockable in a position so that steering is effected solely by the other pair of wheels wherein sensor means are provided associated with each of the two pairs of wheels to provide an electrical signal to a control means when the respective wheels are in an aligned position in which their axes of rotation are perpendicular to a longitudinal axis of the vehicle, the control means including a selector means comprising electrical switch means to enable an operator to select simple steering mode in which only one of the pairs of wheels are movable to effect steering, or a compound steering mode in which both of the pairs of wheels are movable to effect steering, the control means further comprising means to maintain the selected steering mode until an alternative steering mode is selected by operation of the selector means and the control means receives a signal from at least one of the sensor means associated with one of the pairs of wheels.
REFERENCES:
patent: 3185245 (1965-05-01), Hoyt
patent: 3750834 (1973-08-01), Luft
patent: 4175638 (1979-11-01), Christesen
Andrew Robert J.
Frost Roger A.
Herbert Paul F.
J. C. Bamford Excavators Limited
Pekar John A.
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