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A pyrotechnic pretensioner (10) for a safety system in a vehicle has an inflator (22) including a propelling charge (26) and an igniter (32) and including a housing (12) in which a pressure chamber (14) is provided into which gas can flow and in which a piston can be displaced by the gas, an end pie

A pyrotechnic pretensioner (10) for a safety system in a vehicle has an inflator (22) including a propelling charge (26) and an igniter (32) and including a housing (12) in which a pressure chamber (14) is provided into which gas can flow and in which a piston can be displaced by the gas, an end piece (16) which closes the pressure chamber (14) and in which a chamber (24) is formed into which the propelling charge (26) is filled and whose wall constitutes the wall of the propellant is provided on the housing (12).

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1. A pyrotechnic pretensioner (10) for a safety system in a vehicle comprising: an inflator (22) including a propelling charge (26) as well as an igniter (32);a housing (12) in which a pressure chamber (14) is provided into which gas from the inflator (22) flow and in which a piston is displaced by

1. A pyrotechnic pretensioner (10) for a safety system in a vehicle comprising: an inflator (22) including a propelling charge (26) as well as an igniter (32);a housing (12) in which a pressure chamber (14) is provided into which gas from the inflator (22) flow and in which a piston is displaced by the gas, the housing (12) including metallic tube (38, 40); andan end piece (16) closing the pressure chamber (14) and having a wall extending towards the igniter (32) to form a chamber (24) for the propelling charge (26),wherein the end piece (16) connects one of the metallic tubes (38) to another of the metallic tubes (40). 2. The pyrotechnic pretensioner according to claim 1, wherein an igniter (32) is provided on the end piece (16). 3. The pyrotechnic pretensioner according to claim 1, wherein the end piece (16) is made of plastic material. 4. The pyrotechnic pretensioner according to claim 1, wherein the metallic tube (38) at least partly encloses the end piece (16). 5. The pyrotechnic pretensioner according to claim 1, wherein the igniter (32) is a pre-fabricated, self-contained component separated from the propelling charge (26) by an igniter housing. 6. The pyrotechnic pretensioner according to claim 1, wherein the wall of the end piece defines a substantially cylindrical chamber for receiving the propelling charge such that the wall engages the propelling charge. 7. The pyrotechnic pretensioner according to claim 1, wherein the wall of the end piece extends the entire length of the propelling charge. 8. The pyrotechnic pretensioner according to claim 1, wherein the end piece includes a first portion extending into one of the metallic tubes along a first direction and a second portion extending into another of the metallic tubes along a second direction angled relative to first direction. 9. The pyrotechnic pretensioner according to claim 1, wherein the wall of the end piece engages the igniter. 10. A pyrotechnic pretensioner (10) for a safety system in a vehicle comprising: an inflator (22) including a propelling charge (26) as well as an igniter (32);a housing (12) in which a pressure chamber (14) is provided into which gas from the inflator (22) can flow and in which a piston can be displaced by the gas; andan end piece (16) closing the pressure chamber (14) and having a wall forming a chamber (24) for the propelling charge (26), wherein a gas conduit (36) is provided in the end piece (16) and forms a fluidic communication between the chamber (24) for the propelling charge (26) and the pressure chamber (14) when the propelling charge (26) is ignited;wherein the housing (12) includes interconnected metallic tubes (38, 40) connected by the end piece (16). 11. The pyrotechnic pretensioner according to claim 10, wherein a guide passage (34) for a tensile element of the safety system is provided on the end piece (16). 12. The pyrotechnic pretensioner according to claim 11, wherein the end piece (16) includes a first portion (18) in which the guide passage (34) and the gas conduit (36) is arranged, and a second portion (20) laterally projecting and arranged at an angle to the first portion (18) in which the chamber (24) for the propelling charge (26) is arranged. 13. The pyrotechnic pretensioner according to claim 12, wherein the igniter (32) is provided on the second portion (20) and closes the chamber (24) for the propelling charge (26) of the inflator (22). 14. A pyrotechnic pretensioner (10) for a safety system in a vehicle comprising: an inflator (22) including a propelling charge (26) as well as an igniter (32);a housing (12) in which a pressure chamber (14) is provided into which gas from the inflator (22) can flow and in which a piston can be displaced by the gas; andan end piece (16) closing the pressure chamber (14) and having a wall forming a chamber (24) for the propelling charge (26), wherein a bursting wall (28) is provided in the end piece (16) between the chamber (24) for the propelling charge (26) and the pressure chamber (14),wherein the housing (12) includes interconnected metallic tubes (38, 40) connected by the end piece (16). 15. A pyrotechnic pretensioner for a safety system in a vehicle comprising: an inflator including a propelling charge and an igniter;a housing including first and second metallic tubes and a pressure chamber into which gas from the inflator can flow and in which a piston can be displaced by the gas; andan end piece closing the pressure chamber and extending into the first and second tubes to interconnect the first and second tubes, the wall of the end piece defining a chamber extending the entire length of the propelling charge for receiving the propelling charge. 16. The pyrotechnic pretensioner according to claim 15 wherein the end piece includes a first portion extending into the first tube along a first direction and a second portion extending into the second tube along a second direction angled relative to the first direction. 17. The pyrotechnic pretensioner according to claim 15, wherein the wall of the end piece engages the propelling charge.