A spring suspension system allowing movements between the drive compartment and a frame portion of a heavy duty vehicle with a plurality of degrees of freedom and with a frequency range of from as low as about 1 Hz and up to 5000 Hz and more, comprises at least one axially operative spring member formed...http://www.google.de/patents/US4500076?utm_source=gb-gplus-sharePatent US4500076 - Arrangement in spring suspension systems particularly for vehicles
