Patent ID: 8535362

Claim:
Device for conveying air, in particular heated air, to a person, in which the device comprises an air-permeable inner sheet to be turned towards the person and an air-impermeable outer sheet to be turned away from the person; in which the inner sheet and the outer sheet are connected to one another in an air-tight manner by a peripheral weld which, together with the inner and outer sheet, defines an air chamber; in which the device is provided with at least one connection for blowing in air; in which the inner sheet and the outer sheet, in the air chamber, are connected to one another by a plurality of welds in such a manner that, when air is blown into the device via the connection, the former assumes a panel-like shape having a plurality of air ducts which are connected to one another; in which the plurality of air ducts comprises a main duct and one or more ancillary ducts; in which the main duct has an inlet end and an outlet end; in which the connection ends at an inlet end of the main duct; in that the main duct, viewed at the inlet end and in the non-inflated state, has a main duct width; in that the plurality of welds comprises at least one first series of elongate first welded strips, first intermediate spaces between which are in line with one another, which first series delimits one side of the main duct; in that the length of each of these first intermediate spaces, viewed in the non-inflated state, is in each case smaller than the main duct width; in that the length of each first welded strip of the first series is at least 15% of the main duct width and at most 80% of the main duct width; and in that the plurality of welds comprises a dividing weld which is arranged outside of the main duct at the outlet end in line with the main duct and which is surrounded by divided air both upstream and downstream of the dividing weld.