Low profile igniter
An igniter includes a housing having a first end with an opening, a second end opposite the first end, a longitudinal axis extending from the first end to the second end, and a top surface with a weakened area. The igniter may further include a pyrotechnic material disposed within the housing, a header having a first end and a second end opposite the first end, and a bridge element provided on the first end of the header and having lead wires on the second end of the header. The first end of the header may be inserted into the opening of the housing in a first direction so as to force the header against the pyrotechnic material. Flow of current through the bridge element heats the bridge element and ignites the pyrotechnic material, which causes the weakened area to rupture.
1. An igniter comprising:
a housing having a first end, a second end opposite the first end, a longitudinal axis extending from the first end to the second end, a housing side wall, a bottom wall, and a top wall with a top surface, the first end having an opening, the top wall in contact with the housing side wall, the housing side wall extending around the second end, the bottom wall in contact with the housing side wall, and the top surface having a weakened area;
a pyrotechnic material disposed within the housing;
a header having a first end and a second end opposite the first end, the first end of the header being inserted into the opening of the housing in a first direction so as to force the header against the pyrotechnic material; and
a bridge element provided on the first end of the header and having lead wires on the second end of the header, wherein
flow of current through the bridge element heats the bridge element and ignites the pyrotechnic material, which causes the weakened area to rupture, and
the housing has a hollow, rectangular cross-section in a plane perpendicular to the longitudinal axis.
2. The igniter according to claim 1 , wherein the top surface of the housing extends in a plane substantially parallel to the longitudinal axis of the housing.
3. The igniter according to claim 2 , wherein, when the weakened area ruptures, the ignited pyrotechnic material is expelled in a direction perpendicular to the longitudinal axis of the housing.
4. The igniter according to claim 1 , wherein the housing is composed of an aluminum alloy.
5. The igniter according to claim 4 , wherein the aluminum alloy is an anodized aluminum alloy.
6. The igniter according to claim 1 , wherein the second end of the housing is curved when viewed from above the top surface.
7. The igniter according to claim 1 , wherein the header, inserted into the housing, is sealed to the housing.
8. The igniter according to clam 1 , wherein the weakened area of the top surface has a reduced thickness compared to a remainder of the housing.
9. The igniter according to claim 1 , wherein the pyrotechnic material is a single type of pyrotechnic material.
10. The igniter according to claim 9 , wherein the single type of pyrotechnic material is electrically conductive.
11. The igniter according to claim 1 , wherein
the housing with the top surface is configured to direct the rupture of the weakened area in only one direction; and
the pyrotechnic material is in direct contact with the weakened area before rupture.
12. A method of manufacturing an igniter, the method comprising:
providing an igniter housing, the igniter housing having a first end, a second end opposite the first end, a longitudinal axis extending from the first end to the second end, a housing side wall, a bottom wall, and a top wall with a top surface, the first end having an opening, the top wall in contact with the housing side wall, the housing side wall extending around the second end, the bottom wall in contact with the housing side wall ,and the top surface having a weakened area;
loading a pyrotechnic material into the opening of the housing;
inserting a header into the opening of the pre-filled housing in a first direction parallel to the longitudinal axis, the header having a first end that is inserted into the housing, a second end opposite the first end, and a bridge element provided on the first end and having lead wires on the second end;
pressing the bridge element of the header against the pyrotechnic material within the housing; and
attaching the header to the housing, wherein
when current flows through the bridge element, the bridge element is heated to ignite the pyrotechnic material, which ruptures the weakened area, and
the housing has a hollow, rectangular cross-section in a plane perpendicular to the longitudinal axis.
13. The method according to claim 12 , wherein the top surface of the housing extends in a plane substantially parallel to the longitudinal axis of the housing.
14. The method according to claim 13 , wherein, when the weakened area ruptures, the ignited pyrotechnic material is expelled in a direction perpendicular to the first direction.
15. The method according to claim 12 , wherein the housing is composed of an aluminum alloy.
16. The method according to claim 15 , wherein the aluminum alloy is an anodized aluminum alloy.
17. The method according to claim 12 , wherein the second end of the housing is curved when viewed from above the top surface.
18. The method according to claim 12 , wherein the weakened area of the top surface has a reduced thickness compared to surrounding areas of the housing.
19. The igniter according to claim 12 , wherein
the igniter housing with the top surface is configured to direct the rupture of the weakened area in only one direction; and
the pyrotechnic material is in direct contact with the weakened area before rupture.