| CPC B60N 2/4242 (2013.01) [B60N 2/42709 (2013.01); B60N 2/42736 (2013.01); B64D 11/0619 (2014.12)] | 10 Claims |

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1. A mechanism disposed between a frame structure and a base structure, the mechanism comprising:
a damper including a piston rod, wherein the damper is mechanically connected between the frame structure and the base structure in a normal mode of operation, wherein the damper enables a longitudinal and suspended upward and downward movement of the frame perpendicular to a plane;
an energy-absorbing arrangement comprising:
a plastically deformable absorbing element, wherein the plastically deformable absorbing element is adapted to plastically deform in response to stresses greater than a predetermined threshold stress along an axis perpendicular to the plane;
a bar mechanically attached to the plastically deformable absorbing element and having a first engagement portion;
a locking mechanism attached to the frame structure, wherein the locking mechanism comprises:
a pivot perpendicularly attached through the base structure;
a plate including a second engagement portion rotationally attached to the pivot, wherein responsive to an explosion the plate is rotated about the pivot to provide an engagement of the second engagement portion with the first engagement portion to switch from the normal mode of operation to an abnormal mode of operation, wherein in the abnormal mode of operation the energy-absorbing arrangement is operatively connected between the frame structure and the base structure thereby, to utilize the energy absorption properties of the energy-absorbing arrangement.
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