High explosive firing mechanism

Patent metadata

Field	Value
Publication number	US-10837747-B2
Application number	US-201815897840-A
Country	US
Kind code	B2
Filing date	Feb 15, 2018
Priority date	Feb 15, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The present disclosure provides a high explosive firing mechanism. The high explosive firing mechanism may comprise a housing comprising a firing pin tube having a primer inlet. The high explosive firing mechanism may further comprise a firing pin disposed within the firing pin tube, the firing pin comprising a nub. The nub may partially extend into the primer inlet.

First claim

What is claimed is:

1. A high explosive firing mechanism, comprising:
a housing comprising,
a firing pin tube having a first tube portion that extends to an end wall that closes an open end of the firing pin tube, and a primer inlet that extends through the end wall, wherein the first tube portion comprises a first diameter and the primer inlet comprises a second diameter that is less than the first diameter;
a firing pin comprising a first firing pin portion disposed within the first tube portion of the firing pin tube, the firing pin further comprising an end face and a nub that protrudes from the end face, wherein the end face of the firing pin is spaced from the end wall and the nub partially extends into the primer inlet prior to activation of the high explosive firing mechanism; and
a transition tube in fluid communication with the firing pin tube; and

a high energy transfer line coupled to the housing and configured to transfer expanding gases to the firing pin, wherein the high explosive firing mechanism forms a portion of an egress system.

2. The high explosive firing mechanism of claim 1 , wherein the firing pin further comprises a first face, an O-ring groove extending circumferentially around the firing pin, and a shear pin groove extending circumferentially around the firing pin and situated between the first face and O-ring groove, wherein the O-ring groove is situated between the end face and the shear pin groove.

3. The high explosive firing mechanism of claim 2 , wherein a spacing between an end of the nub and the end face of the firing pin is greater than a spacing between the end face of the firing pin and the end wall of firing pin tube.

4. The high explosive firing mechanism of claim 2 , wherein the end face of the firing pin is located a distance between 0.038 and 0.070 inches from the end wall of the firing pin tube in a first position for the firing pin.

5. The high explosive firing mechanism of claim 1 , wherein the housing further comprises an input tube in fluid communication with the transition tube.

6. The high explosive firing mechanism of claim 1 , wherein the nub is configured to impact a primer contained in the primer inlet in a second position for the firing pin.

7. The high explosive firing mechanism of claim 2 , further comprising a shear pin extending through a housing aperture into the shear pin groove and an O-ring situated within the O-ring groove.

8. The high explosive firing mechanism of claim 7 , wherein the shear pin is configured to mechanically fail at a threshold force on the shear pin.

9. An egress system for an aircraft, comprising:
a high explosive firing mechanism, comprising,
a housing comprising,
a firing pin tube having a first tube portion that extends to an end wall that closes an open end of the firing pin tube, and a primer inlet that extends through the end wall, wherein the first tube portion comprises a first diameter and the primer inlet comprises a second diameter that is less than the first diameter;
a firing pin comprising a first firing pin portion disposed within the first tube portion of the firing pin tube, the firing pin further comprising an end face and a nub that protrudes from the end face, wherein the end face of the firing pin is spaced from the end wall and the nub partially extends into the primer inlet prior to activation of the high explosive firing mechanism; and
a transition tube in fluid communication with the firing pin tube; and

a high energy transfer line coupled to the housing and configured to transfer expanding gases to the firing pin, wherein the high explosive firing mechanism forms a portion of the egress system.

10. The egress system of claim 9 , further comprising an input component and output component coupled to the high explosive firing mechanism.

11. The egress system of claim 9 , wherein the firing pin further comprises a first face, an O-ring groove extending circumerentially around the firing pin, and a shear pin groove extending circumferentially around the firing pin and situated between the first face and O-ring groove, wherein the O-ring groove is situated between the end face and the shear pin groove.

12. The egress system of claim 11 , wherein the end face of the firing pin is configured to contact the end wall of the firing pin tube when the firing pin is in a second position, and wherein the end face of the firing pin is spaced from the end wall of the firing pin tube when the firing pin is in a first position.

13. The egress system of claim 12 , wherein the end face of the firing pin is located a distance between 0.038 and 0.070 inches from the end wall of the firing pin tube when the firing pin is in the first position.

14. The egress system of claim 12 , wherein the nub is configured to impact a primer contained in the primer inlet when the firing pin is in the second position.

15. The egress system of claim 11 , wherein the high explosive firing mechanism further comprises a shear pin extending through a housing aperture into the shear pin groove and an O-ring situated within the O-ring groove.

16. The egress system of claim 15 , wherein the shear pin is configured to mechanically fail at a threshold force on the shear pin.

17. A method of transferring a high explosive signal, comprising:
forming an input tube and firing pin tube within a housing, wherein the firing pin tube comprises a first tube portion, wherein the first tube portion comprises a first diameter;
inserting an O-ring in an O-ring groove of a firing pin;
inserting the firing pin into the firing pin tube, wherein the firing pin comprises a first firing pin portion disposed within the first tube portion of the firing pin tube, the firing pin further comprising an end face and a nub that protrudes from the end face, wherein an end wall closes an open end of the firing pin tube, and wherein a primer inlet extends through the end wall and comprises a second diameter that is less than the first diameter; and
inserting a high energy transfer line into the input tube, wherein the housing forms a portion of an egress system, wherein the end face of the firing pin is spaced from the end wall and the nub of the firing pin extends into a primer inlet prior to activation of the high energy transfer line.

18. The method of claim 17 , further comprising,
igniting the high energy transfer line; and
impacting a primer with the firing pin.

Assignees

• Goodrich Corp

Inventors

• Wilson Brian
• Mueller Kevin

Classifications

• F42C7/00 Primary

  Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure (by ammunition impact F42C1/00, by exposure to a predetermined ambient fluid pressure F42C5/00) · CPC title

• B64C1/32

  Severable or jettisonable parts of fuselage facilitating emergency escape · CPC title

• F42C19/0807

  characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters · CPC title

• F42B3/10 Primary

  Initiators therefor (percussion fuzes F42C7/00; percussion caps F42C19/10; electric primers F42C19/12) · CPC title

• F42D1/043

  Connectors for detonating cords and ignition tubes, e.g. Nonel tubes (mounting of detonators in blasting cartridges F42B3/26) · CPC title