Fastening Apparatus

1 . A fastening apparatus for a hollow and closed additional wing on a two-part basic body of a rear spoiler for a motor vehicle, the additional wing extending between cheeks of the two-part basic body and being mounted on supporting faces, and at least one transversely extending air throughflow opening being defined between the two-part basic body and the additional wing, the fastening apparatus comprising:

screw connections for connecting free ends of the additional wing in a region of the supporting faces of the two-part basic body, said screw connections each having a cage and a threaded screw being held in said cage, said cage disposed within a hollow space of the two-part basic body, the hollow space of the two-part basic body being closed off by a covering shell of the rear spoiler, said screw connections further having a threaded nut held to correspond with said threaded screw being captive in said cage and disposed within a hollow space of the additional wing.

2 . The fastening apparatus according to claim 1 , wherein:

said threaded screw has a head and a free shaft end;

said cage is disposed in the two-part basic body and has a web; and

said threaded screw being captive in said cage is held by way of said head such that said threaded screw is supported on said web of said cage in a premounting position such that said free shaft end of said threaded screw is held in a positionally fixed manner in a through hole of a wall of the two-part basic body.

3 . The fastening apparatus according to claim 1 , wherein the covering shell has a hole formed therein for a passage of a tool and the hole is disposed coaxially with respect to said threaded screw, said threaded screw can be transferred by use of the tool from the premounting position into a fixed position and vice versa.

4 . The fastening apparatus according to claim 1 , wherein:

the additional wing is produced with said threaded nut inserted therein;

the two-part basic body is produced with said cage attached therein and has said threaded screw situated therein; and

subsequently the covering shell is connected to the two-part basic body and the additional wing is fastened to the two-part basic body via said threaded screw.

5 . The fastening apparatus according to claim 2 , wherein said web is an annular web.

6 . A rear spoiler for a motor vehicle, the rear spoiler comprising:

a two-part basic body having cheeks, supporting surfaces, and a hollow space formed therein;

a covering shell closing off said hollow space of said two-part basic body;

an additional wing disposed on said two-part basic body and having free ends and a hollow space formed therein, said additional wing extending between said cheeks of said two-part basic body and being mounted on said supporting faces, and at least one transversely extending air throughflow opening being defined between said two-part basic body and said additional wing; and

a fastening apparatus containing screw connections for connecting said free ends of said additional wing disposed in a region of said supporting faces of said two-part basic body, said screw connections each having a cage and a threaded screw being held in said cage, said cage disposed within said hollow space of said two-part basic body, said screw connections further having a threaded nut held to correspond with said threaded screw held captive in said cage and disposed within said hollow space of said additional wing.

7 . The fastening apparatus according to claim 6 , wherein:

said threaded screw has a head and a free shaft end;

said cage is disposed in said two-part basic body and has a web;

said two-part basic body has a wall with a through hole formed therein; and

said threaded screw which is captive in said cage is held by way of said head such that said threaded screw is supported on said web of said cage in a premounting position such that said free shaft end of said threaded screw is held in a positionally fixed manner in said through hole of said wall of said two-part basic body.

8 . The fastening apparatus according to claim 6 , wherein said covering shell has a hole formed therein for a passage of a tool and said hole is disposed coaxially with respect to said threaded screw, said threaded screw can be transferred by use of the tool from the premounting position into a fixed position and vice versa.

9 . The fastening apparatus according to claim 6 , wherein:

said additional wing is produced with said threaded nut inserted therein;

said two-part basic body is produced with said cage attached therein and has said threaded screw situated therein; and

subsequently said covering shell is connected to said two-part basic body and said additional wing is fastened to said two-part basic body via said threaded screw.

10 . The fastening apparatus according to claim 6 , wherein said web is an annular web.