Integral pyrotechnic initiator with molded connector

• US 6,644,198 B1
• Filed: 10/31/2000
• Issued: 11/11/2003
• Est. Priority Date: 10/31/2000
• Status: Expired due to Term

• Current Assignee: Special Devices Incorporated (Daicel Corporation)
• Original Assignee: Special Devices Incorporated (Daicel Corporation)
• Inventors: Avetisian, Vahan, Chimayan, Mher
• Primary Examiner(s): JOHNSON, STEPHEN
• Application Number:
  US09/703,097
• Time in Patent Office: 1,106 Days
• Field of Search: 102/202.5, 102/202.7, 102/202.8, 102/202.9, 102/202.12, 102/202.14, 280/741
• US Class Current: 102/202.14
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: F42B 3/103 Mounting initiator heads in initiators; Sealing-plugs
• CPC Class Codes: F42C 19/06 Electric contact parts specially adapted for use with electric fuzes switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/005 requiring successive relative motions to complete the coupling, e.g. bayonet type
• CPC Class Codes: H01R 43/18 for manufacturing bases or cases for contact members

Abstract

A pyrotechnic initiator has a molded connector with a hollow interior, where the connector includes at least one locking tab extending from the connector wall toward the centerline of the connector, overhanging the hollow interior of the connector. A mating connector can be inserted past the locking tab for a mounting connection and pulled out past the locking tab for disconnecting the pyrotechnic initiator. The molded connector feature preferably is injection molded around a molding assembly which is used to form at least one locking tab. Cavities corresponding to the location of the locking tabs are provided by the intersection of separate pieces of the molding assembly.

Claims

1. A pyrotechnic initiator for mating, comprising:

a pyrotechnic igniter including a top, a bottom including one or more electrical leads, and an outer surface between said top and said bottom;

a retainer; and

a molded nonconductive body intimately and directly bonded to substantially all of said outer surface of said igniter and to said retainer, said body including a connector comprising;

a substantially solid connector wall defining a hollow interior and including a substantially cylindrical exposed inner surface; and

at least one exposed locking tab extending inwardly from said inner surface and radially extending along less than substantially all of the radial extent of said substantially cylindrical exposed inner surface of said connector wall.

2. The pyrotechnic initiator of claim 1, wherein said connector has a plurality of said locking tabs.

3. The pyrotechnic initiator of claim 2, wherein said connector wall has a rim around which said plurality of locking tabs are positioned.

4. The pyrotechnic initiator of claim 3, wherein said locking tabs are positioned substantially symmetrically along said rim.

5. The pyrotechnic initiator of claim 3, wherein said locking tabs are positioned substantially evenly along said rim.

6. The pyrotechnic initiator of claim 2, wherein said connector has four locking tabs.

7. The pyrotechnic initiator of claim 1, wherein said at least one locking tab extends substantially along a length defined by a forty-five degree arc segment of said inner surface.

8. The pyrotechnic initiator of claim 1, wherein said nonconductive body is substantially composed of nylon.

9. The pyrotechnic initiator of claim 8, wherein said connector includes a rim with a plurality of inwardly-extending locking tabs positioned symmetrically and spaced evenly along said rim, and said one or more electrical leads extend into said hollow interior of said connector.

10. The pyrotechnic initiator of claim 9, wherein said connector is a universal connector.

11. A pyrotechnic initiator for mating made by a method comprising the steps of:

providing a pyrotechnic igniter including a top, a bottom including one or more electrical leads, and an outer surface between said top and said bottom;

providing a retainer; and

intimately and directly bonding a molded nonconductive body to substantially all of said outer surface of said igniter and to said retainer, said body including a connector comprising;

a substantially solid connector wall defining a hollow interior and including a substantially cylindrical exposed inner surface; and

at least one exposed locking tab extending inwardly from said inner surface and radially extending along less than substantially all of the radial extent of said substantially cylindrical exposed inner surface of said connector wall.

12. The initiator of claim 11, wherein said step of intimately and directly bonding includes the following steps:

placing said retainer in a mold along with said igniter and one or more electrical leads;

forming at least one cavity at the intersection of separate parts of a molding assembly;

engaging said one or more electrical leads with said molding assembly; and

,

injecting hot liquid into said mold, said liquid adapted for injection molding, whereby at least one locking tab is formed at the location of said at least one cavity.

13. The initiator of claim 12, wherein said molding assembly includes a sleeve, and a core, said core having a plurality of protrusions.

14. The initiator of claim 13, wherein said method further comprises the steps of:

moving said sleeve in a substantially axial direction;

rotating said core; and

,

moving said core in a substantially axial direction.

15. A method of making a pyrotechnic initiator for mating, comprising the steps of:

providing a pyrotechnic igniter including a top, a bottom including one or more electrical leads, and an outer surface between said top and said bottom;

providing a retainer; and

intimately and directly bonding a molded nonconductive body to substantially all of said outer surface of said igniter and to said retainer, said body including a connector comprising;

a substantially solid connector wall defining a hollow interior and including a substantially cylindrical exposed inner surface; and

at least one exposed locking tab extending inwardly from said inner surface and radially extending along less than substantially all of the radial extent of said substantially cylindrical exposed inner surface of said connector wall.

16. The method of claim 15, wherein said nonconductive body is substantially composed of nylon.

17. The method of claim 15, wherein said connector is a universal connector.

18. The method of claim 15, wherein said step of intimately and directly bonding includes the following steps:

placing said retainer in a mold along with said igniter and one or more electrical leads;

forming at least one cavity at the intersection of separate parts of a molding assembly;

engaging said one or more electrical leads with said molding assembly; and

,

injecting hot liquid into said mold, said liquid adapted for injection molding, whereby at least one locking tab is formed at the location of said at least one cavity.

19. The method of claim 18, wherein said molding assembly includes a sleeve, and a core, said core having a plurality of protrusions.

20. The method of claim 19, further comprising the steps of:

moving said sleeve in a substantially axial direction;

rotating said core; and

,

moving said core in a substantially axial direction.