Mobile crane
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United States of America Patent
Stats
-
Aug 18, 1981
Grant Date -
N/A
app pub date -
Apr 26, 1979
filing date -
Apr 26, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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- Non-US Classification not provided for expired patents
Cited Art Landscape
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