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Energy-absorbing seat arrangement
| Details |
Inventors: Martin, John S.;
Assignee: Engineering Patents and Equipment Limited (St. Peter, GB1)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
An energy absorbing seat arrangement, particularly for a helicopter, in which a seat pan is carried by a frame slidably mounted on parallel upwardly extending pillars secured to the helicopter. In normal conditions, downward sliding of the frame on the pillars is prevented, in one embodiment, by metal rods fixed with respect to the pillars, and extending through drawing dies fixed with respect to the seat frame. In a variant the rods and dies are replaced by a deformable metal tube and a mandrel extending through the tube. In the event of a crash in which rapid downward movement of the helicopter and the pillars is halted suddenly, the seat and seat frame continue to move downwardly, sliding along the pillars, while drawing of the rods through the dies, or drawing of the mandrel through the deformable tube, to dissipate the kinetic energy of the seat and its occupant relatively gradually. |
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DETAILED DESCRIPTION It is an object of the present invention to provide such an energy-absorbing seat arrangement which is simple and reliable in operation and which will not present a hazard in normal use.
According to the present invention there is provided an energy-absorbing seat arrangement including a first structure, including a seat pan, and a second structure adapted for fixing to an aircraft, vehicle or the like, said first structure being connected with said second structure by means including at least one deformable metal member arranged to undergo controlled, predetermined plastic deformation, in the event of the force acting between said first and second structure in at least one predetermined direction exceeding a predetermined value, in such a way as to allow controlled, energy-absorbing movement to take place between said structure under the action of said force.
In one embodiment of the invention, deformable metal members are provided in the form of elongate bolts which are drawn through dies under tension arising from impact or inertial forces in a crash situation, the drawing of said bolts through the dies serving to absorb the energy of the impact relatively gradually.
In another embodiment of the invention the bolts and dies are replaced by mandrels which are drawn through respective deformable tubular members to expand the same in the event of a crash.
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Telecommunications 
