Safety belt and method for producing a safety belt

1. A seat belt ( 10 ) for a motor vehicle, comprising a webbing ( 12 ) that includes two webbing layers ( 28 , 30 ), which define a webbing interior, and a heating layer ( 26 ) substantially in the webbing interior, the heating layer ( 26 ) including an electric heating element ( 24 ) having an end penetrating one of the webbing layers ( 28 , 30 ) from an interior surface of the penetrated webbing layer ( 28 , 30 ) to an exterior surface of the penetrated webbing layer ( 28 , 30 ), the penetrating end of the electric heating element ( 24 ) being connected to the exterior surface of the penetrated webbing layer ( 28 , 30 ).

2. The seat belt according to claim 1 , wherein the heating element ( 24 ) extends at least over a partial area of the webbing ( 12 ) in the longitudinal direction.

3. The seat belt according to claim 1 , wherein the electric heating element ( 24 ) includes an electric heating material ( 34 ) which is coupled to webbing material of the heating layer ( 26 ).

4. The seat belt according to claim 1 , wherein the heating element ( 24 ) is at least partially interwoven with webbing material of the heating layer ( 26 ).

5. The seat belt according to claim 1 , wherein the seat belt ( 10 ) includes an end fitting ( 16 ) connected to an end of the webbing ( 12 ), the end fitting ( 16 ) having a power supply interface ( 40 ) thereon, the power supply interface ( 40 ) being electrically coupled to the end of the electric heating element ( 24 ).

6. The seat belt according to claim 5 , wherein the end of the electric heating element ( 24 ) is connected to the exterior surface of the webbing ( 12 ) via a solder and/or crimp bonding ( 36 ), an electric line ( 38 ) extending from the power supply interface ( 40 ) to the solder and/or crimp bonding ( 36 ) such that the electric heating element ( 24 ) is electrically connected to the power supply interface ( 40 ) via the electric line ( 38 ) and the solder and/or crimp bonding ( 36 ).

7. A method for manufacturing the seat belt ( 10 ) according to claim 1 , comprising the steps of:

providing a webbing material and the electric heating element ( 24 ), and

coupling the webbing material to the electric heating element ( 24 ) in a weaving process to form the heating layer ( 26 ).

8. The method according to claim 7 , wherein the two webbing layers ( 28 , 30 ) are provided, wherein the electric heating element ( 24 ) is interposed substantially between the two webbing layers ( 28 , 30 ), wherein the two webbing layers ( 28 , 30 ) are interconnected, for example at the periphery.

9. The method according to claim 7 , further comprising:

providing the two webbing layers ( 28 , 30 ),

interposing the heating layer ( 26 ) between the two webbing layers ( 28 , 30 ) such that the heating layer ( 26 ) and electric heating element ( 24 ) are in the webbing interior defined by the two webbing layers ( 28 , 30 ), and

passing the end of the electric heating element ( 24 ) entirely through one of the webbing layers ( 28 , 30 ) from the webbing interior to the exterior surface of the webbing ( 12 ).

10. The method according to claim 7 , wherein the end of heating element ( 24 ) is contacted on the exterior surface of the webbing ( 12 ) by means of soldering or crimping.

11. The seat belt according to claim 3 , wherein the heating material ( 34 ) comprises at least one conductive carbon fiber yarn, at least one conductive silver yarn, at least one conductive wire, at least one conductive copper strand and/or at least one conductive stainless steel strand.

12. The seat belt according to claim 5 , wherein the end fitting ( 16 ) is connected to a first end of the webbing ( 12 ), the seat belt ( 10 ) further comprising:

a webbing retractor ( 14 ) connected to a second end of the webbing ( 12 ); and

a plug tongue ( 20 ) on and moveable along the webbing ( 12 ) between the first and second ends of the webbing ( 12 ).

13. A seat belt ( 10 ) for a motor vehicle, comprising a webbing ( 12 ) that includes two webbing layers ( 28 , 30 ), which define a webbing interior, and a heating layer ( 26 ) substantially in the webbing interior, each webbing layer ( 28 , 30 ) including yarns ( 32 ) of webbing material, the heating layer ( 26 ) including first yarns of an electric heating material ( 34 ) and second yarns ( 42 ) of webbing material, the first yarns of electric heating material ( 34 ) being configured to provide thermal heat when supplied with current, portions of the second yarns ( 42 ) of the heating layer ( 26 ) being connected to the yarns ( 32 ) of each webbing layer ( 28 , 30 ).

14. The seat belt according to claim 13 , wherein a portion of the yarns ( 32 ) of a first one of the webbing layers ( 28 ) is passed downward to the heating layer ( 26 ) and connected with a portion of the second yarns ( 42 ) of the heating layer ( 26 ) via interweaving, a portion of the yarns ( 32 ) of a second one of the webbing layers ( 28 ) being passed upward to the heating layer ( 26 ) and connected with a portion of the second yarns ( 42 ) of the heating layer ( 26 ) via interweaving.

15. The seat belt according to claim 14 , wherein the yarns ( 32 ) of the first and second webbing layers ( 28 , 30 ) are warp yarns, the first yarns of the heating layer ( 26 ) are warp yarns, and the second yarns ( 42 ) of the heating layer ( 26 ) are weft yarns.

16. The seat belt according to claim 13 , wherein ends of the first yarns of the electric heating material ( 34 ) extend entirely through one of the webbing layers ( 28 , 30 ) to an exterior surface of the webbing ( 12 ).

17. A seat belt ( 10 ) for a motor vehicle, comprising:

a first webbing layer ( 28 ) including first and second yarns of webbing material;

a second webbing layer ( 30 ) including first and second yarns of webbing material, the first yarns of the second webbing layer ( 30 ) being connected to the second yarns of the first webbing layer ( 28 ) at the first webbing layer ( 28 ), the first yarns of the first webbing layer ( 28 ) being connected to the second yarns of the second webbing layer ( 30 ) at the second webbing layer ( 30 ); and

a heating layer ( 26 ) interposed between the first and second webbing layers ( 28 , 30 ), the heating layer ( 26 ) including conductive fibers ( 34 ) configured to provide thermal heat when supplied with current, the first yarns of each of the first and second webbing layers ( 28 , 30 ) extending through the heating layer ( 26 ) between the conductive fibers ( 34 ) of the heating layer ( 26 ) to the other of the first and second webbing layers ( 28 , 30 ).

18. The seat belt according to claim 17 , wherein the first yarns of the first and second webbing layers ( 28 , 30 ) are warp yarns and the second yarns of the first and second webbing layers ( 28 , 30 ) are weft yarns.

19. The seat belt according to claim 17 , wherein ends of the conductive fibers ( 34 ) extend entirely through one of the first and second webbing layers ( 28 , 30 ) to an exterior surface of the webbing ( 12 ).