Mobile crane

Details Mobile crane Mobile crane

1979-04-26

1981-08-18

Pekar, John A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

D62D 506

Patent

active

042841593

ABSTRACT:
A straddle type mobile crane includes a steering system which allows two-wheel or four-wheel steering. A first steering cylinder is associated with each wheel for four-wheel operation and an additional cylinder is associated with each of a first pair of wheels for two-wheel steering. An interlock system has a first mode for four-wheel drive wherein each wheel is coupled to its associated first steering cylinder and a second mode wherein each wheel is uncoupled from each first cylinder and each of the first pair of wheels are coupled to one of the additional cylinders and the other pair of wheels are locked to the frame. A first control prevents operation of the interlock unless the wheels are in predetermined orientation and a second control maintains proper alignment of the wheels in all angular positions.

REFERENCES:
patent: 3087564 (1963-04-01), Quayle
patent: 3556241 (1971-01-01), Mitchell
patent: 3680653 (1972-08-01), Murata et al.

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