Steering system for gantry-type crane

Details Steering system for gantry-type crane Steering system for gantry-type crane

1981-11-18

1984-07-03

Peters, Jr., Joseph F.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

B62D 508

Patent

active

044573898

ABSTRACT:
A steering system for a gantry-type crane includes a hydraulic cylinder coupled to each wheel and operable to turn the same through at least a right angle. A hydraulic control system includes a first control valve having a two-wheel steering mode for connecting a first pair of cylinders to a pressure source and in a series relation with each other for two-wheel steering and having a four-wheel mold for connecting the first pair of cylinders in a parallel relation with each other for four wheel steering. A second control valve means has a two-wheel mode for isolating a second pair of cylinders from the pressure source and a four-wheel steering mold for connecting the second pair of cylinders to a pressure source. The first and second control valve means are selectively operable for sequentially moving each of the pairs of cylinders between their first and second steering modes.

REFERENCES:
patent: 2512979 (1950-06-01), Strotmer
patent: 2863518 (1958-12-01), Pellizzetti
patent: 3087564 (1963-04-01), Quayle
patent: 3495846 (1970-02-01), Tax
patent: 3696881 (1972-10-01), Gordon
patent: 4284159 (1981-08-01), Voelz

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