Passenger seat support structure

Claim 1

A vehicle seat support arrangement for passenger vehicles on land, water or in the air, comprising a seat support structure carrying a number of seats and backrests mounted on said seats, said seat support structure including support legs, a transverse frame structure mounted on said support legs and consisting of two essentially tubular spaced parallel profile struts of quadrilateral cross-section and at least one quadrilateral support frame mounted on said profile struts and seat and backrest members mounted on said support frame, said profile struts having two partial box spar sections each having a closed cross-sectional shape and two C-shaped track sections integral with the box spar sections, all arranged along opposite edges of said profile struts such that said C-shaped track sections overlay said partial box spar sections with their tracks being open in opposite directions, and said quadrilateral support frames comprising tubular members of quadrilateral cross-section disposed edgewise on said profile struts, said support legs and said quadrilateral support frames being mounted to said profile struts by groove bolts disposed slidably in the grooves of the C-shaped track sections of the profile struts so as to form together a rigid yet lightweight support arrangement.