Aircraft seat with nested energy attenuation guide system
An aircraft seat assembly including stanchions defining elongated guide channels and elongated motion sleds nested in the guide channels and affixed to a seat bucket. An energy absorber implemented as a wire bender assembly is coupled between the stanchions and the motion sled. In use, the elongated guide channels guide motion of the motion sleds and the wire bender assemblies attenuate energy during a dynamic event exceeding a predetermined threshold load value. The elongated interface between the guide channels and motion sleds serve to transfer excessive loading to the seat frame thereby protecting the seat assembly from damage and the occupant from excessive lumbar spinal loads.
1. An aircraft seat assembly, comprising:
a stanchion including an elongated guide channel;
an elongated motion sled nested in the elongated guide channel;
a seat bucket affixed to the elongated motion sled; and
an energy absorber coupled between the stanchion and the elongated motion sled, the energy absorber configured to control motion of the elongated motion sled relative to the stanchion as the elongated motion sled strokes relative to the stanchion when a predetermined threshold load value is exceeded;
wherein the energy absorber is a wire bender assembly comprising:
a plurality of rollers affixed to the stanchion and positioned in the elongated guide channel; and
a wire affixed to the elongated motion sled and engaging the plurality of rollers;
wherein, when the predetermined threshold load value is exceeded, movement of the elongated motion sled relative to the stanchion causes the wire to be pulled through the plurality of rollers thereby deforming the wire by bending the wire thereby attenuating energy; and
wherein the wire increases in cross section toward a top of the wire such that resistance increases with continued motion of the elongated motion sled relative to the stanchion.
2. The aircraft seat assembly according to claim 1 , further comprising a low friction material positioned at an interface between the elongated motion sled and the stanchion, the low friction material having a lower coefficient of friction as compared to at least one of the elongated motion sled and the stanchion.
3. The aircraft seat assembly according to claim 1 , wherein the guide channel has a C-shaped cross section opening in a first direction and the elongated motion sled has a C-shaped cross section opening in a second direction opposite the first direction.
4. The aircraft seat assembly according to claim 1 , wherein the seat bucket is affixed to the elongated motion sled by at least three attachment points.
5. The aircraft seat assembly according to claim 1 , comprising two stanchions symmetrically arranged, each of the two stanchions defining the elongated guide channel and having the elongated motion sled positioned therein and the energy absorber, and wherein the seat bucket is affixed to the two elongated motion sleds in a symmetrical arrangement.
6. The aircraft seat assembly according to claim 1 , wherein the elongated guide channel and the elongated motion sled overlap a length of at least 24 inches.
7. An aircraft seat assembly, comprising:
a stanchion including an elongated guide channel;
an elongated motion sled nested in the elongated guide channel;
a seat bucket affixed to the elongated motion sled; and
an energy absorber coupled between the stanchion and the elongated motion sled, the energy absorber configured to control motion of the elongated motion sled relative to the stanchion as the elongated motion sled strokes relative to the stanchion when a predetermined threshold load value is exceeded;
wherein the guide channel has a C-shaped cross section opening in a first direction, and the elongated motion sled has a C-shaped cross section opening in a second direction opposite the first direction.
8. The aircraft seat assembly according to claim 7 , further comprising a low friction material positioned at an interface between the elongated motion sled and the stanchion, the low friction material having a lower coefficient of friction as compared to at least one of the elongated motion sled and the stanchion.
9. The aircraft seat assembly according to claim 7 , wherein the energy absorber is a wire bender assembly comprising:
a plurality of rollers affixed to the stanchion and positioned in the elongated guide channel; and
a wire affixed to the elongated motion sled and engaging the plurality of rollers;
wherein, when the predetermined threshold load value is exceeded, movement of the elongated motion sled relative to the stanchion causes the wire to be pulled through the plurality of rollers thereby deforming the wire by bending the wire thereby attenuating energy.
10. The aircraft seat assembly according to claim 9 , wherein the wire increases in cross section toward a top of the wire such that resistance increases with continued motion of the elongated motion sled relative to the stanchion.
11. The aircraft seat assembly according to claim 7 , wherein the seat bucket is affixed to the elongated motion sled by at least three attachment points.
12. The aircraft seat assembly according to claim 7 , comprising two stanchions symmetrically arranged, each of the two stanchions defining the elongated guide channel and having the elongated motion sled positioned therein and the energy absorber, and wherein the seat bucket is affixed to the two elongated motion sleds in a symmetrical arrangement.
13. The aircraft seat assembly according to claim 7 , wherein the elongated guide channel and the elongated motion sled overlap a length of at least 24 inches.
14. An aircraft seat assembly, comprising:
a stanchion including an elongated guide channel;
an elongated motion sled nested in the elongated guide channel;
a seat bucket affixed to the elongated motion sled; and
an energy absorber coupled between the stanchion and the elongated motion sled, the energy absorber configured to control motion of the elongated motion sled relative to the stanchion as the elongated motion sled strokes relative to the stanchion when a predetermined threshold load value is exceeded;
wherein the elongated guide channel and the elongated motion sled overlap a length of at least 24 inches.
15. The aircraft seat assembly according to claim 14 , further comprising a low friction material positioned at an interface between the elongated motion sled and the stanchion, the low friction material having a lower coefficient of friction as compared to at least one of the elongated motion sled and the stanchion.
16. The aircraft seat assembly according to claim 14 , wherein the energy absorber is a wire bender assembly comprising:
a plurality of rollers affixed to the stanchion and positioned in the elongated guide channel; and
a wire affixed to the elongated motion sled and engaging the plurality of rollers;
wherein, when the predetermined threshold load value is exceeded, movement of the elongated motion sled relative to the stanchion causes the wire to be pulled through the plurality of rollers thereby deforming the wire by bending the wire thereby attenuating energy.
17. The aircraft seat assembly according to claim 16 , wherein the wire increases in cross section toward a top of the wire such that resistance increases with continued motion of the elongated motion sled relative to the stanchion.
18. The aircraft seat assembly according to claim 14 , wherein the guide channel has a C-shaped cross section opening in a first direction and the elongated motion sled has a C-shaped cross section opening in a second direction opposite the first direction.
19. The aircraft seat assembly according to claim 14 , wherein the seat bucket is affixed to the elongated motion sled by at least three attachment points.
20. The aircraft seat assembly according to claim 14 , comprising two stanchions symmetrically arranged, each of the two stanchions defining the elongated guide channel and having the elongated motion sled positioned therein and the energy absorber, and wherein the seat bucket is affixed to the two elongated motion sleds in a symmetrical arrangement.