IP Library › Granted Patent US 12669315
Granted Patent B1
US 12669315 · App. 19/051,688 · Granted Jun 30, 2026

Modular exploding foil initiator assembly

Inventors: Daniel Swenston (Middletown, CA); Brent Chicoine (Middletown, CA)
Assignee: Reynolds Systems, Inc.
F42B3/125
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Quick Facts
Patent No.
US 12669315
App. No.
19/051,688
Granted
Jun 30, 2026
Kind
B1
Abstract

An exploding foil initiator (EFI) assembly includes: a housing assembly, having a base, one or more elongated supports spaced about a circumference of the base extending axially away from the base, and protuberances extending radially-inwardly toward a central axis; a spring configured to compress a leadframe, an insulator, a pellet sleeve, and an explosive pellet; and a retainer cap with a surface that abuts the spring that releasably engages the protuberances and compresses the spring while engaged with the protuberances.

Claims (34)

1 . An exploding foil initiator (EFI) assembly, comprising:

a housing assembly, having a base, elongated supports spaced about a circumference of the base extending axially away from the base, and protuberances extending away from a distal end of the elongated supports;

an elastic member configured to compress a leadframe, an insulator, a pellet sleeve, and an explosive pellet; and

a retainer cap with a surface that abuts the elastic member spring that releasably engages the protuberances and the retainer cap compresses the elastic member to direct an axial force received from the retainer cap towards the base while engaged with the protuberances.

2 . The EFI assembly recited in claim 1 , wherein the elastic member is formed from foam.

3 . The EFI assembly recited in claim 1 , wherein the housing assembly further comprises an annular housing having an annular cavity.

4 . The EFI assembly recited in claim 1 , wherein the housing assembly is formed from a plant-based resin.

5 . The EFI assembly recited in claim 1 , wherein the housing assembly includes a receptacle for a microprocessor.

6 . The EFI assembly recited in claim 1 , wherein the leadframe includes two or more terminals.

7 . The EFI assembly recited in claim 1 , wherein the leadframe includes three terminals.

8 . The EFI assembly recited in claim 1 , wherein the pellet sleeve includes a locating member extending radially outwardly away from the central axis, and the locating member abuts adjacent elongated supports.

9 . The EFI assembly recited in claim 1 , wherein the pellet sleeve has a non-continuous inner diameter and outer diameter.

10 . The EFI assembly recited in claim 1 , wherein the retainer cap includes a plurality of ears that releasably engage with the protuberances.

11 . An exploding foil initiator (EFI) assembly, comprising:

a housing assembly, having a base, elongated supports spaced about a circumference of the base extending axially away from the base, and protuberances extending away from a distal end of the elongated supports;

a leadframe having a plurality of elongated conductors, received by the housing assembly;

a pellet sleeve received coaxially within the housing assembly, having an inner diameter;

an insulator having a metallic foil attached to a surface;

an explosive pellet received within the inner diameter of the pellet sleeve;

an elastic member configured to compress the leadframe, the insulator, the pellet sleeve, and the explosive pellet; and

a retainer cap, with a surface that abuts the elastic member, that releasably engages the protuberances and the retainer cap compresses the elastic member to direct an axial force received from the retainer cap towards the base while the retainer cap is engaged with the protuberances.

12 . The EFI assembly recited in claim 11 , wherein the elastic member is formed from foam.

13 . The EFI assembly recited in claim 11 wherein the housing assembly further comprises an annular housing having an annular cavity.

14 . The EFI assembly recited in claim 11 , wherein the housing assembly is formed from a plant-based resin.

15 . The EFI assembly recited in claim 11 , wherein the housing assembly includes a receptacle for a microprocessor.

16 . The EFI assembly recited in claim 11 , wherein the leadframe includes two or more terminals.

17 . The EFI assembly recited in claim 11 , wherein the leadframe includes three terminals.

18 . The EFI assembly recited in claim 11 , wherein the pellet sleeve includes a locating member extending radially outwardly away from the central axis, and the locating member abuts adjacent elongated supports.

19 . The EFI assembly recited in claim 11 , wherein the pellet sleeve has a non-continuous inner diameter and outer diameter.

20 . The EFI assembly recited in claim 11 , wherein the retainer cap includes a plurality of ears that releasably engage with the protuberances.

21 . An exploding foil initiator (EFI) assembly, comprising:

a housing assembly, having a base, elongated supports spaced about a circumference of the base extending axially away from the base, and protuberances extending away from a distal end of the elongated supports;

an elastic member formed from foam configured to compress a leadframe, an insulator, a pellet sleeve, and an explosive pellet; and

a retainer cap with a surface that abuts the elastic member that releasably engages the protuberances and the retainer cap compresses the elastic member while engaged with the protuberances.