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1. (WO2019028005) MECHANICALLY DAMPED PULL THEN LIFT HOLD OPEN ROD MECHANISM
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WHAT IS CLAIMED IS:

1 . A hold open rod configured to provide switched damping movement comprising:

an inner tube assembly coupled to an outer tube assembly, the inner tube assembly movable within the outer tube assembly; and

a damping mechanism configured to damp movement of the outer tube assembly with respect to the inner tube assembly.

2. The hold open rod of claim 1 further comprising:

an inner collar having a lock groove and unlock groove;

an outer collar assembly coupled around the inner collar;

a spring located within the outer collar assembly configured to engage the inner collar; and

a locking dog configured to engage the unlock groove when the hold open rod is in an unlocked configuration and the locking dog further configured to engage the lock groove when the hold open rod is in a locked configuration,

wherein the damping mechanism comprises a damping dog configured to engage the inner tube assembly.

3. The hold open rod of claim 2, wherein the damping mechanism comprises the damping dog configured to engage the inner tube assembly and a damping collar configured to move the damping dog from a damping configuration to a non-damping configuration.

4. The hold open rod of claim 2, wherein the damping mechanism comprises the damping dog configured to engage the inner tube assembly and a damping collar having a damping groove and a non-damping groove configured to receive the damping dog.

5. The hold open rod of claim 2, wherein the damping mechanism is arranged inside the outer collar assembly.

6. The hold open rod of claim 2, further comprising:

a lock body coupled to the outer tube assembly.

7. The hold open rod of claim 6, further comprising a collar locking pin configured to engage a groove on the lock body or the outer tube assembly when the hold open rod changes from the locked configuration to the unlocked configuration.

8. The hold open rod of claim 7, wherein the outer collar assembly is configured to hold the collar locking pin and the inner collar.

9. The hold open rod of claim 2, wherein the damping mechanism comprises the damping dog configured to engage the inner tube assembly, a damping collar configured to move the damping dog from a damping configuration to a non-damping configuration, and the damping collar having a damping groove and a non-damping groove configured to receive the damping dog.

10. A movable aircraft structure comprising the hold open rod of claim 2.

1 1 . A hold open rod, comprising:

an inner tube assembly coupled to an outer tube assembly, the inner tube assembly movable within the outer tube assembly;

an inner collar having a lock groove and unlock groove;

an outer collar assembly coupled around the inner collar;

a spring located within the outer collar assembly configured to engage the inner collar;

a locking dog configured to engage the unlock groove when the hold open rod is in an unlocked configuration and the locking dog further configured to engage the lock groove when the hold open rod is in a locked configuration; and

a damping mechanism configured to selectively damp movement of the outer tube assembly with respect to the inner tube assembly when the inner tube assembly is moving with respect to the outer tube assembly.

12. The hold open rod of claim 1 1 , wherein the damping mechanism comprises a damping dog configured to engage the inner tube assembly.

13. The hold open rod of claim 1 1 , wherein the damping mechanism comprises a damping dog configured to engage the inner tube assembly and a damping collar configured to move the damping dog from a damping configuration to a non-damping configuration.

14. The hold open rod of claim 1 1 , wherein the damping mechanism comprises a damping dog configured to engage the inner tube assembly and a damping collar

having a damping groove and a non-damping groove configured to receive the damping dog.

15. The hold open rod of claim 1 1 , wherein the damping mechanism is arranged inside the outer collar assembly.

16. The hold open rod of claim 1 1 , further comprising:

a lock body coupled to the outer tube assembly.

17. The hold open rod of claim 16, further comprising a collar locking pin configured to engage a groove on the lock body or the outer tube assembly when the hold open rod changes from the locked configuration to the unlocked configuration.

18. The hold open rod of claim 17, wherein the outer collar assembly is configured to hold the collar locking pin and the inner collar.

19. The hold open rod of claim 1 1 , wherein the damping mechanism comprises a damping dog configured to engage the inner tube assembly, a damping collar configured to move the damping dog from a damping configuration to a non-damping configuration, and the damping collar having a damping groove and a non-damping groove configured to receive the damping dog.

20. A hold open rod, comprising:

an inner tube assembly coupled to an outer tube assembly, the inner tube assembly movable within the outer tube assembly;

an inner collar having a lock groove and unlock groove;

an outer collar assembly coupled around the inner collar;

a spring located within the outer collar assembly configured to engage the inner collar;

a locking dog configured to engage the unlock groove when the hold open rod is in an unlocked configuration and the locking dog further configured to engage the lock groove when the hold open rod is in a locked configuration; and

a damping mechanism configured to damp movement of the outer tube assembly with respect to the inner tube assembly when the inner tube assembly is retracting into the outer tube assembly.