Abstract: A return air blocking device for ventilation of the interior of a motor vehicle, with a frame or housing with at least one sealing surface and with at least one flexible valve flap mounted on the frame or the housing, which in an idle position abuts on the sealing surface and prevents a flow of air through the return air blocking device, and which, when a sufficient pressure occurs, assumes an opening position lifted from the sealing surface in which it allows a flow of air through the return air blocking device, wherein the at least one valve flap comprises at least one slit on its end mounted on the frame or housing, wherein the frame or the housing comprises at least one holding projection which engages in the at least one slit.

Abstract: A return air blocking device for ventilation of the interior of a motor vehicle, with a frame or housing with at least one sealing surface and with at least one flexible valve flap mounted on the frame or the housing, which in an idle position abuts on the sealing surface and prevents a flow of air through the return air blocking device, and which, when a sufficient pressure occurs, assumes an opening position lifted from the sealing surface in which it allows a flow of air through the return air blocking device, wherein the at least one valve flap comprises at least one slit on its end mounted on the frame or housing, wherein the frame or the housing comprises at least one holding projection which engages in the at least one slit.

Abstract: A molded plastic rivet for affixing two parts to each other when the rivet is inserted through two mutually aligned apertures in the parts. The rivet includes a pin having a pin head, a pin shank and first and second pin latching offsets at the distal end of the pin shank. The latching elements include at least first latching offsets.

Abstract: A molded plastic rivet (10) for affixing two parts to each other when said rivet is inserted through two mutually aligned apertures in said parts, said rivet comprising, a pin (14) having a head (38), a shank (36) and first and second latching offsets (40,42) at the distal end of the shank, a rivet body (12) having a head (20), and a shank that is insertable in said apertures and comprises several legs running away from the head of the rivet body, wherein approximately diametrically opposite protrusions (50,52) are configured on the side of the head of the rivet body at regions opposite the shank of the rivet body and are fitted with recesses or apertures (54,56) for receiving the arms of a fork-shaped assembly tool (66).