Attachment of a landing gear

1. An attachment connecting a helicopter cabin extending in a longitudinal direction to a landing gear traverse extending in a transverse direction generally perpendicular to the longitudinal direction, the attachment comprising:

a bracket extending from the helicopter cabin;

a landing gear retainer secured around the landing gear traverse and hinged to the bracket;

a pendulum comprising:

a lower pendulum bolt connected to the bracket below the landing gear retainer to rotate about a lower rotational axis parallel to the longitudinal direction;

at least one upper pendulum bolt connected to the landing gear retainer; and

at least one connecting rod connected to the lower and upper pendulum bolts to pivot;

wherein the landing gear retainer is hinged to the bracket by the pendulum to move in the landing gear transverse direction relative to the helicopter cabin.

2. The attachment according to claim 1 , wherein the upper pendulum bolt is generally co-linear with a central axis of the landing gear traverse.

3. The attachment according to claim 2 , wherein the connecting rod is offset from a centerline of the landing gear traverse.

4. The attachment according to claim 3 , wherein the at least one connecting rod comprises two connecting rods symmetric about the centerline of the landing gear traverse.

5. The attachment according to claim 4 , wherein the at least one upper pendulum bolt comprises two upper pendulum bolts, wherein one of the connecting rods is connected to each of the upper pendulum bolts.

6. The attachment according to claim 1 , wherein the upper pendulum bolt is positioned below the landing gear traverse.

7. The attachment according to claim 6 , wherein the at least one connecting rod comprises two connecting rods connected between the upper and lower pendulum bolts.

8. The attachment according to claim 1 , wherein the landing gear retainer comprises a ring being coaxial with the transverse direction.

9. The attachment according to claim 8 , wherein the ring comprises a clamp ring having a screw for tightening the clamp ring on the landing gear traverse to prevent movement of the landing gear traverse relative to the landing gear retainer.

10. The attachment according to claim 1 , further comprising at least one compound spring generally perpendicular to the upper and lower pendulum bolts.

11. The attachment according to claim 10 , wherein the at least one compound spring includes a spring bolt and a plurality of springs.

12. The attachment according to claim 1 , further comprising stop plates positioned between the landing gear retainer and the bracket to limit motion of the transverse in the longitudinal direction.

13. The attachment according to claim 12 , wherein the stop plates have a friction coefficient between 0.5 and 0.15.

14. An attachment bracket connecting a helicopter cabin extending a longitudinal direction to a landing gear traverse extending in a transverse direction generally perpendicular to the longitudinal direction, the attachment bracket comprising:

a bracket connected to the helicopter cabin;

a landing gear retainer connected to the helicopter cabin and secured around the landing gear traverse and coaxial with the transverse direction; and

a pendulum hinged to the cabin with a lower pendulum bolt in a lower pendulum bearing, and the pendulum hinged to the landing gear retainer with an upper pendulum bolt in an upper pendulum bearing, wherein the upper pendulum bolt is generally co-linear with a central axis of the landing gear traverse; and

an offset rod connecting the upper and lower pendulum bolts,

wherein the pendulum provides mobility of the helicopter cabin in the landing gear traverse direction.

15. The attachment according to claim 14 , further comprising a second offset connecting rod connecting the upper and lower pendulum bolts.

16. The attachment according to claim 14 , further comprising a second upper pendulum bolt.

17. The attachment according to claim 14 , further comprising at least one compound spring generally perpendicular to the upper and lower pendulum bolts.

18. The attachment according to claim 14 , wherein the upper and lower pendulum bolts are mounted on one side of the transverse.

19. The attachment according to claim 14 , further comprising:

a lever extending from the landing gear retainer;

a flange extending from the bracket; and

a spring pad positioned between the lever and the flange to limit amplitude of movement of the transverse in the longitudinal direction.