Adjustable preload severance cutter for ejection systems

Patent metadata

Field	Value
Publication number	US-11345477-B2
Application number	US-201916707810-A
Country	US
Kind code	B2
Filing date	Dec 9, 2019
Priority date	Dec 9, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A severance cutter may comprise a housing and a blade may be coupled to the housing. A restraint support may be configured to translate relative to the blade. A spring may be configured to bias a support opening defined by the restraint support away from the blade.

First claim

What is claimed is:

1. A severance cutter, comprising:
a housing;
a blade coupled to the housing;
a restraint support configured to translate relative to the blade; and
a spring adjustably coupled to the restraint support, wherein the spring is configured to bias a support opening defined by the restraint support away from the blade.

2. The severance cutter of claim 1 , further comprising a cap coupled to the housing.

3. The severance cutter of claim 2 , wherein the spring is configured to bias the restraint support toward the cap.

4. The severance cutter of claim 2 , wherein the spring is configured to bias the restraint support away from the cap.

5. The severance cutter of claim 1 , wherein the housing defines an opening, and wherein a cutting edge of the blade is exposed by the opening.

6. The severance cutter of claim 1 , further comprising a collar adjustably coupled to the housing.

7. The severance cutter of claim 6 , wherein the housing defines a first threaded surface configured to engage a second threaded surface defined by the collar.

8. A leg restraint system for an ejection seat, comprising:
a leg restraint;
a pully operably coupled to the leg restraint, the pully including a wheel, wherein the leg restraint is located through the pully, wherein the pully is configured to allow the wheel to rotate in a first direction and to restrict a rotation of the wheel in a second direction opposite the first direction; and
a severance cutter coupled to an end of the leg restraint, the severance cutter including:
a housing;
a blade coupled to the housing;
a restraint support configured to translate relative to the blade, wherein the leg restraint is located through a support opening defined by the restraint support; and
a spring adjustably coupled to the restraint support, wherein the spring is configured to bias the leg restraint away from the blade.

9. The leg restraint system of claim 8 , wherein the severance cutter further comprises:
a collar adjustably coupled to the housing; and
a cap coupled to the housing.

10. The leg restraint system of claim 9 , wherein the spring is configured to bias the restraint support toward the cap.

11. The leg restraint system of claim 9 , wherein the spring is configured to bias the restraint support away from the cap.

12. The leg restraint system of claim 9 , wherein the housing defines an opening, and wherein the leg restraint is located through the opening.

13. The leg restraint system of claim 9 , wherein the severance cutter further includes a lock nut configured to restrict translation of the collar relative to the housing.

14. The leg restraint system of claim 13 , wherein a load associated with translating the restraint support is increased by translating the collar relative to the housing.

15. The leg restraint system of claim 14 , wherein the housing defines a first threaded surface configured to engage a second threaded surface defined by the collar.

16. The leg restraint system of claim 9 , further comprising a lanyard coupled to at least one of the cap or the collar.

17. An ejection seat, comprising:
a seat pan;
a leg restraint coupled to the seat pan; and
a severance cutter coupled to an end of the leg restraint, the severance cutter including:
a housing;
a blade coupled to the housing;
a restraint support configured to translate relative to the blade, wherein the leg restraint is located through a support opening defined by the restraint support; and
a spring configured to bias the leg restraint away from the blade.

18. The ejection seat of claim 17 , wherein the severance cutter further comprises a cap coupled to the housing, and wherein the spring is configured to bias the restraint support toward the cap.

19. The ejection seat of claim 17 , wherein the severance cutter further comprises a cap coupled to the housing, and wherein the spring is configured to bias the restraint support away from the cap.

20. The ejection seat of claim 17 , further comprising a collar adjustably coupled to the housing, wherein a load associated with translating the restraint support is increased by translating the collar relative to the housing.

Assignees

• Ami Ind Inc

Inventors

• Gough David Linden
• Benjamin Jeff
• Salois Matthew D

Classifications

• B64D25/10 Primary

  Ejector seats · CPC title

• B26D5/08 Primary

  Means for actuating the cutting member to effect the cut · CPC title

• B26D7/2614

  Means for mounting the cutting member · CPC title