![]() ![]() Lowering the weight of the hitches would be desirable to accommodate these lightweight flatbeds. Moreover, projected plans for future railroad transport of trailers include use of lightweight flatbed cars weighing only a fraction of today's conventional flatbed cars, to effect less expensive construction and also lighter, more sophisticated wheel bearings. Not only is this weight a drawback on collapsible railroad flatbed stanchions, but it also adds considerably to the weight of a conventional truck tractor. Thus, fifth wheel hitches are still of heavy steel construction. However, the cast aluminum was not of sufficient strength to withstand the stresses normally encountered. Efforts have been made heretofore to form a fifth wheel of aluminum, namely by casting the fifth wheel plate of aluminum, to achieve lightweight construction. Because fifth wheels are particularly heavy, the elevation and lowering of this weight can present a practical problem. B61D45/005- Fixing semi-trailers by using fifth wheel locksįifth wheel hitches used on flatbed railroad cars as for piggyback transport of truck trailers normally are mounted on top of a vertically collapsible stanchion.B61D45/001- Devices for fixing to walls or floors. ![]()
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