(57) A mobile crane (2) for lifting and transportion of immobile patients consists of
a driving chassis (4) having a crane post (10) topwise provided with a vertically
pivotal crane boom (14) projecting forwardly over the driving chassis (4) and supported
by a raising and lowering mechanism (16). The wheel supported driving chassis (4)
has a transverse base member (8), which carries the crane post (10) and is connected
with forwardly protruding floor supported beams (6), which are adjustable in the horizontal
plane between a "narrow" position, in which the crane (2) may be moved through a door
opening, and a "broad" position, in which the crane (2) is more safely supported on
the floor. It has been normal practice that the floor beams (6) are movable between
the two positions by means of a manually powered shifting mechanism, which, however,
involves certain serious problems with respect to a safe handling of the patient.
According to the invention the shifting of the floor beams (6) between the said positions
is effected by a motor driven mechanism, which is actuated from a hand carried control
box (18), whereby the operator may attend to the patient with both hands also during
the actuation of the shifting mechanism.
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