Self-stowage assembly for a seat

1. A seat with self-stowage capability, the seat comprising:

a seat pan lever which is rotatable between stowed and open positions;

a fixed seat structure comprising an annulus; and

an elastic assembly comprising a damper and an arc-spring disposable within the annulus to permit first rotations of the seat pan lever from the stowed position to the open positions and to urge second rotations of the seat pan lever from the open positions to the stowed position,

wherein the arc-spring comprises:

a major longitudinal curvature that follows a corresponding curvature of the annulus; and

a minor curvature, which is defined along the major longitudinal curvature, and which is constrained within radial and axial dimensions of the annulus.

2. The seat according to claim 1 , wherein a fully open position is 90° from the stowed position.

3. A seat with self-stowage capability, the seat comprising:

a seat pan comprising a lever, a boss coupled with the lever and defining an axis about which the lever is rotatable and a first stopper coupled with the boss;

a fixed seat structure comprising a second stopper and an annulus in which the second stopper is fixed and the first stopper is disposable; and

an elastic assembly comprising an arc-spring and being disposable within the annulus between the first and second stoppers to permit first movements of the first stopper through the annulus relative to the second stopper in association with first rotations of the lever about the axis and to urge second movements of the first stopper through the annulus relative to the second stopper in association with second rotations of the lever about the axis,

wherein the arc-spring comprises:

a major longitudinal curvature that follows a corresponding curvature of the annulus; and

a minor curvature, which is defined along the major longitudinal curvature, and which is constrained within radial and axial dimensions of the annulus.

4. The seat according to claim 3 , wherein the lever is rotatable about the axis between a stowed rotational position and open rotational positions.

5. The seat according to claim 3 , wherein the boss is partially cylindrical and the first stopper extends radially outwardly from an exterior surface of the boss.

6. The seat according to claim 3 , wherein the seat pan comprises a pair of first stoppers and the fixed seat structure comprises a pair of second stoppers.

7. The seat according to claim 3 , wherein:

the elastic assembly further comprises a damper, which is disposable for abutment with the first stopper, and

the arc-spring is anchored between the second stopper and the damper.

8. The seat according to claim 7 , wherein the damper comprises material that is one or more of deformable and compliant.

9. The seat according to claim 7 , wherein the arc-spring comprises an arc-compression spring, which is compressed in the circumferential dimension of the annulus.

10. The seat according to claim 7 , wherein the elastic assembly further comprises a bearing assembly to support the elastic assembly.

11. The seat according to claim 7 , wherein a full extension of the arc-spring positions the damper and the first stopper less than halfway around the annulus.

12. An aircraft, comprising:

a fixed wall structure; and

a seat with self-stowage capability, comprising:

a seat pan comprising a lever, a boss coupled with the lever and defining an axis about which the lever is rotatable relative to the fixed wall structure between stowed and open positions and a first stopper coupled with the boss;

a fixed seat structure which is fixed to the fixed wall structure and comprises a second stopper and an annulus in which the second stopper is fixed and the first stopper is disposable; and

an elastic assembly comprising an arc-spring and being disposable within the annulus between the first and second stoppers to permit first movements of the first stopper through the annulus relative to the second stopper in association with first rotations of the lever about the axis and to urge second movements of the first stopper through the annulus relative to the second stopper in association with second rotations of the lever about the axis,

wherein the arc-spring comprises:

a major longitudinal curvature that follows a corresponding curvature of the annulus; and

a minor curvature, which is defined along the major longitudinal curvature, and which is constrained within radial and axial dimensions of the annulus.

13. The aircraft according to claim 12 , wherein a fully open position is 90° from the stowed position.

14. The aircraft according to claim 12 , wherein the boss is partially cylindrical and the first stopper extends radially outwardly from an exterior surface of the boss.

15. The aircraft according to claim 12 , wherein the seat pan comprises a pair of first stoppers and the fixed seat structure comprises a pair of second stoppers.

16. The aircraft according to claim 12 , wherein:

the elastic assembly further comprises a damper, which is disposable for abutment with the first stopper, and

the arc-spring is anchored between the second stopper and the damper.

17. The aircraft according to claim 16 , wherein the damper comprises material that is one or more of deformable and compliant.

18. The aircraft according to claim 16 , wherein the arc-spring comprises an arc-compression spring, which is compressed in the circumferential dimension of the annulus.

19. The aircraft according to claim 16 , wherein the elastic assembly further comprises a bearing assembly to support the elastic assembly.

20. The aircraft according to claim 16 , wherein a full extension of the arc-spring positions the damper and the first stopper less than halfway around the annulus.