Patent ID: 7743870
Filing Date: 2010-06-29
Classification: B62D,B66C

Abstract:
1. A crane comprising: bogie structures in the corners of the crane, two wheels arranged in tandem in each bogie structure, each of the wheels being arranged in the bogie structure to be turnable about its own vertical axis, and being offset from its own vertical axis, and one wheel being a drive wheel and another being an idle wheel, a mechanism that drives and turns each drive wheel, and a turning device arrangement provided between each wheel pair for turning the wheel pair in co-operation to a selected position, wherein the turning device arrangement comprises at least two turning rods connecting the wheels, which turning rods are connected to counterparts provided for each turning position in load-bearing structures of the wheels and turning along therewith, wherein one of the turning rods is arranged to turn the wheels in the same direction and another of the turning rods is arranged to turn the wheels in opposite directions, whereby at one wheel the position of one of the turning rods and the counterparts in the wheel's load-bearing structure is slidable around the load-bearing structure, yet the one of the counterparts and turning rods that corresponds to the selected turning position may be locked with a locking mechanism immobile with respect to the load-bearing structure for enabling wheel turning, wherein the turning rods are secured to fastenings in the load-bearing structures of the wheels, which fastenings are able to slide or rotate at one wheel about the load-bearing structure thereof, yet the one of the fastenings that corresponds to the selected turning position may be locked with a locking mechanism immobile to the load-bearing structure for enabling wheel turning.