Steering controlling device for wheel crane

Details Steering controlling device for wheel crane Steering controlling device for wheel crane

1989-11-17

1991-02-26

Marmor, Charles A.

Motor vehicles

Having four wheels driven

With means for steering all driven wheels

180140, B60K 17358

Patent

active

049954725

ABSTRACT:
A steering controlling device for a wheel crane wherein a locking operation in a special mode is permitted upon changing over from the special mode to a normal mode and locking and a mode changing over operation can be prevented during normal running of the crane. The device includes front and rear wheel steering cylinders, a mode changing over valve for controlling the cylinders to change over the steering mode, a mode selecting switch, a locking device for locking the rear wheels in the normal mode, a locking switch, a running detecting sensor for detecting a running condition of the crane, a locking change-over controller means responsive to signals from the locking switch and the running detecting sensor for developing a locking or unlocking instruction signal to the locking device when the crane is not in a normal running condition, and a mode change-over controller means responsive to a signal from the running detecting means for forwarding a steering mode selected by the mode selecting switch to the mode changing over valve when the crane is not in a normal running condition.

REFERENCES:
patent: 3185245 (1965-05-01), Hoyt
patent: 4457389 (1984-07-01), Voelz
patent: 4884647 (1989-12-01), Mimuro et al.
patent: 4893689 (1990-01-01), Laurich-Trost
patent: 4917204 (1990-04-01), Andrew et al.

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