Seat assembly with blast mitigation device and front end collision resistance
A seat assembly having a front and a back and adapted to be attached to a floor comprises a seat base and a seat back attached to the seat base, a seat belt mechanism attached to the seat base and free of the floor, a blast mitigation device attached to the seat base and adapted to be secured to the floor, wherein the blast mitigation device has a crumple zone which absorbs energy in the event of a blast, and a front impact dislocation resistance device mounted on the blast mitigation device with a pair of brackets. The front impact dislocation resistance device acts to resist separation of the seat base from the blast mitigation device.
1. A seat assembly having a front and a back and adapted to be attached to a floor comprising, in combination:
a seat base and a seat back attached to the seat base;
a seat belt mechanism attached to the seat base and free of the floor;
a blast mitigation device attached to the seat base and adapted to be secured to the floor, wherein the blast mitigation device has a crumple zone which absorbs energy in the event of a blast, wherein the blast mitigation device comprises a blast box including a rigid front wall, a deformable left wall, a deformable right wall and a deformable back wall; wherein the left wall, right wall and back wall are each formed as a pair of angled plates separated with a crease, and in the event of a blast the left walk right wall and bark wall each deform at the corresponding crease and wherein the rigid front wall does not have a crease and resists deformation; and
a front impact dislocation resistance device mounted on the blast mitigation device with a pair of brackets, wherein the front impact dislocation resistance device acts to resist separation of the seat base from the blast mitigation device.
2. The seat assembly of claim 1 wherein the front impact dislocation resistance device comprises one of a tether and a rigid support.
3. The seat assembly of claim 2 wherein the blast mitigation device has a left wall and a right wall, and the front impact dislocation resistance device comprises a first device and a second device, with the first device positioned on the left wall and the second device positioned on the right wall.
4. The seat assembly of claim 3 wherein the first device and the second device are each mounted on the back wall.
5. The seat assembly of claim 1 wherein the crumple zone is restricted to the left wall, the right wall and the back wall.
6. The seat assembly of claim 1 wherein the crumple zone is remote from the front wall so that during the blast a back portion of the blast box collapses forcing the occupant back into the seat back and seat base in a reclined position.
7. The scat assembly of claim 1 wherein the front impact dislocation resistance device is located on the blast box attached to the back wall.
8. The seat assembly of claim 1 wherein each of the front wall, left wall, right wall and back wall have a pair of horizontal flanges extending parallel to the seat base, and each of the horizontal flanges define mounting surfaces adapted to receive corresponding mounting surfaces from one of the other horizontal flanges, wherein the front wall is an integral single piece with its pair of upper and lower horizontal flanges.
9. A seat assembly having a front and a back and adapted to be attached to a floor comprising, in combination:
a seat having a seat base and a seat back attached to the seat base;
a seat belt mechanism attached to the seat base and free of the floor;
a collapsible blast box attached to the seat base and adapted to be secured to the floor, the blast box includes a rigid sole front wall that resists deformation, a deformable left wall, a deformable right wall and a deformable back wall, wherein the blast box has a crumple zone restricted to the left wall, the right wall and the back wall that absorbs energy in the event of a blast and wherein the left wall, right wall and back wall are each formed as a pair of angled plates separated with a crease, and in the event of a blast the left wall, right wall and back wall each deform at the corresponding crease and wherein the right front wall does not have a crease and resists deformation.
10. The seat assembly of claim 9 wherein the crumple zone is remote from the front wall so that during the blast a back portion of the blast box collapses forcing the occupant back into the seat in a reclined position.