Igniter case
AssigneeAutoliv Development AB
InventorsPatrice Boutin, Jose Reinoso
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a metallic case of a pyrotechnical igniter having a wall with at least one weak zone and an inner surface in the case with at least one part facing this at least one weak zone includes positioning the case on a matrix having a plane zone. The method further includes striking the wall with at least one punch so as to, in a single movement of striking, deform at least the part of the inner surface facing this at least one weak zone and having at least one initially curved-in zone in order to bring it on the plane zone and to form in this manner a plane inner surface, and to form the at least one weak zone.
Claims17
A method of manufacturing a metallic case of a pyrotechnical igniter, the pyrotechnic igniter including a wall having at least one weak zone and an inner surface in the case with at least one part facing the at least one weak zone, the method comprising:
- positioning the case on a matrix having a plane zone;
- and
- striking the wall with at least one punch so as to, in a single movement of striking:
- deforming at least the at least one part of the inner surface facing the at least one weak zone and having at least one initially curved-in zone in order to bring on the plane zone and to form an inner plane inner surface, and
- to form the at least one weak zone.
A metallic case of a pyrotechnical igniter comprising
- a wall defining a charging volume;
- and
- at least one weak zone defined by a profile extending along a curved line positioned on the wall, the at least one weak zone designed to rupture at a predetermined pressure lower than a rupture pressure of the wall;
- wherein the at least one weak zone defines a vent hole, the curved line is defined a curved outer surface of the wall opposite a plane inner surface, and at least a part of the inner surface of the vent hole circumferentially between first and second portions of the curved line is curved.
Dependencies are inferred from the claim text.