Energy absorbing device

Abstract

An energy absorbing device includes a first connector and a second connector. The first connector is for connection to the base of a seat back of an aircraft seat and the second connector is for connection to the frame of an aircraft seat. The first connector is moveable relative to the second connector. The energy absorbing device further includes one or more resiliently deformable members which are compressed when the first connector is moved away from the second connector. Also described is a seat comprising the energy absorbing device and a row of seats.

Claims

1. A vehicle seat comprising a seat frame, a seat back and an energy absorbing device, wherein the energy absorbing device comprising a first connector and a second connector, wherein the first connector is configured for connection to the base of the seat back and the second connector is configured for connection to the frame, wherein the first connector is moveable relative to the second connector, wherein the energy absorbing device further comprises at least two resiliently deformable members, which are compressed when the first connector is moved away from the second connector, wherein the at least two resiliently deformable members comprise a polymer material and are separated by a joining member.

2. The vehicle seat according to claim 1, comprising a first part and a second part, the first part being moveable relative to the second part, wherein the first connector is provided on the first part and the second connector is provided on the second part.

3. The vehicle seat according to claim 2, wherein the first part comprises an elongate member.

4. The vehicle seat according to claim 3, comprising a sleeve positioned around the elongate member of the first part and between said elongate member and the at least two resiliently deformable members.

5. The vehicle seat according to claim 2, wherein the first part is pivotable relative to the second part.

6. The vehicle seat according to claim 2, wherein the second part comprises a holding means for holding the first part.

7. The vehicle seat according to claim 6, wherein the holding means is positioned around the first part.

8. The vehicle seat according to claim 6, wherein the first part is moveable through the holding means.

9. The vehicle seat according to claim 6, wherein the holding means is pivotally connected to the second part.

10. The vehicle seat according to claim 6, wherein the first part comprises a first abutment member and the second part comprises a second abutment member and wherein the holding means comprises the second abutment member and wherein the first connector is positioned at or near a first end of the first part, the first abutment member is positioned at or near an opposing second end of the first part, the holding means comprises the second abutment member and the at least two resiliently deformable members are positioned between the holding means and the first abutment member.

11. The vehicle seat according to claim 2, wherein the first part comprises a first abutment member and the second part comprises a second abutment member, wherein the first abutment member abuts one end of the at least two resiliently deformable members and the second abutment member abuts an opposing end of the at least two resiliently deformable members.

12. The vehicle seat according to claim 11, wherein the first connector is positioned at or near a first end of the first part and the first abutment member is positioned at or near an opposing second end of the first part.

13. The vehicle seat according to claim 11, wherein the first abutment member abuts a forward facing end of the at least two resiliently deformable members and the second abutment member abuts a rearward facing end of the at least two resiliently deformable members.

14. The vehicle seat according to claim 2, wherein the at least two resiliently deformable members are positioned around the first part.

15. The vehicle seat according to claim 1, comprising a tensioning means for compressing the at least two resiliently deformable members.

16. The vehicle seat according to claim 1, comprising a recline mechanism.

17. A row of vehicle seats according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Example embodiments of the disclosed technology will now be described with reference to the accompanying Figures, in which

(2) FIGS. 1 and 2 show external and cross-sectional views of an energy absorbing device of the present disclosure;

(3) FIGS. 3 and 4 show external and cross-sectional views of an energy absorbing device which includes a recline mechanism;

(4) FIG. 5 shows the energy absorbing device of FIGS. 3 and 4 attached to the underside of an aircraft seat; and

(5) FIGS. 6A and 6B show side and end views of a resiliently deformable member.

DETAILED DESCRIPTION

(6) The present application relates to an energy absorbing device for use in a seat, preferably a vehicle seat, most preferably an aircraft seat, in particular to a head injury criterion (HIC) device.

(7) With reference to FIGS. 1 and 2, an energy absorbing device 1 comprises a first connector 2a and a second connector 2b. With reference to FIG. 5, the first connector 2a is for connection to the base of a seat back 3 of an aircraft seat and the second connector 2b is for connection to the frame 4 of an aircraft seat.

(8) The first connector 2a is moveable relative to the second connector 2b. When the first connector 2a is moved away from the second connector 2b, a pair of resiliently deformable members 5a, 5b are compressed.

(9) As noted elsewhere herein, the energy absorbing device 1 is intended for use with a seat back 3 which is pivotally supported about side pivot points (not shown), such that when the head of the seat back 3 moves in a forward direction, the base of the seat back 3 moves in a rearward direction. Such movement is typical in the event of an impact from behind the seat; for example, if a passenger sitting in the seat behind is thrown forward in the event of a crash such that their head hits the upper part of the seat back 3 in front of them. When the first connector 2a is connected to the base of the seat back 3 and the second connector 3b is connected to the frame 4 of the aircraft seat at a position forward of the first connector 2a, forward movement of the upper part of the seat back 3 causes rearward movement of the base of the seat back 3 and thus also of the first connector 2a. The position of the second connector 2b is fixed by virtue of its connection to the frame 4 and so the first connector 2a moves away from the second connector 2b and the pair of deformable members 5a, 5b are compressed. Compression of the deformable members 5a, 5b dampens the force of the impact and restricts forward movement of the upper part of seat back 3 minimising injury to both a passenger seated behind the seat back 3 and a passenger seated in a seat of the seat back 3.

(10) The energy absorbing device 1 comprises a first part 6a which includes the first connector 2a and a second part 6b which includes the second connector 2b. The first part 6a is moveable relative to the second part 6b about a hinge 7.

(11) The first part 6a includes a first abutment member 8a and the second part 6b includes a second abutment member 8b. The first abutment member 8a abuts one end of the second resiliently deformable member 5b and the second abutment member 8b abuts an opposing end of the first resiliently deformable member 5a. As such, when the first connector 2a moves away from the second connector 2b, the resiliently deformable members 5a, 5b are compressed between the first 8a and second 8b abutment members.

(12) Taking into account the orientation of the seat and the resiliently deformable members 5a, 5b, it will be appreciated that the first abutment member 8a abuts a forward facing end of the resiliently deformable member 5b and the second abutment member 8b abuts a rearward facing end of the resiliently deformable member 5a.

(13) In the example shown, the first 8a and second 8b abutment members are discs provided with a central aperture through which an elongate member 9 of the first part 6a passes. The elongate member 9 includes a screw thread 10 and a nut 11 provided at one end of the screw thread 10. The nut 11 provides a tensioning means for partially compressing the resiliently deformable members 5a, 5b between the abutment members 8a and 8b. In use, the nut 11 is tightened against the first abutment member 8a such that the deformable members 5a, 5b are compressed to about 10% of their length. In the example shown, and with particular reference to FIG. 6A, the length L of each resiliently deformable member 5a, 5b is 35 mm0.2 mm before installation. Once pre-tensioned, the length of each member 5a, 5b is reduced to about 31.5 mm0.2 mm. With reference to FIG. 6B, the pre-installation diameter D of each resiliently deformable member 5a, 5b is 32 mm0.2 mm and the pre-installation diameter D of the central aperture is 13.5 mm0.2 mm.

(14) As noted above, whilst specific examples for the dimensions of the resiliently deformable members have been presented herein, it will be appreciated that the specific dimensions are determined to suit the particular application.

(15) As shown in FIG. 1, the second part 6b includes a holding means 12 for holding the first part 6a. In the example shown, the holding means 12 comprises a ring positioned around the first part 6a and the first part 6a is moveable through the holding means 12. Also in the example shown, the holding means 12 comprises the disc/ring which forms the second abutment member 8b. The holding means 12 is pivotable about the hinge 7 to allow for pivotable movement of the first part 6a relative to the fixed second part 6b.

(16) Pivotable movement of the first part 6a is particularly advantageous because it allows for the provision of the seat back 3 in different recline positions. For example, this allows one seat to be provided with a different pre-set angle of seat back 3 recline to another seat. Alternatively, or in addition, and as shown with reference to FIGS. 3 to 5 the energy absorbing device 1 can include a recline mechanism 13 and so pivotable movement of the first part 6a allows for movement of the first connector 2a with the base of the seat back 3 as it moves forward/upward during recline of the seat back 3 and rearward/downward during straightening of the seat back 3.

(17) With further reference to FIGS. 3 to 5, a recline mechanism includes a hydraulic piston and cylinder assembly 13, such as a Hydrolok hydraulic seat recline device, provided on the first part 6a adjacent the first connector 2a. The elongate member 9 extends from the forward facing end of the hydraulic piston and cylinder assembly 13 through the holding means 12 and second abutment member 8b and through the resiliently deformable members 5a, 5b, with the first abutment member 8a and tensioning nut 11 provided at its forward facing end.

(18) A cover 14 is provided around the elongate member 9 between the hydraulic piston and cylinder assembly 13 and holding means 12.

(19) As shown in the Figures, each resiliently deformable member 5a, 5b is a cylindrical polyurethane bush. It has been found that if a single resiliently deformable member is provided at a length corresponding to the pair of resiliently deformable members, it bows under compression. However, it has been found that this is prevented by the use of a pair of separate, resiliently deformable members 5a, 5b, with a joining member (metal ring) 15, provided therebetween.

(20) Whilst the polyurethane has been found to be particularly well suited, it will be appreciated that other suitable materials could be used for the resiliently deformable members.

(21) With particular reference to FIGS. 2 and 4, the abutment members 8a, 8b and joining member 15 include recesses 17 bordered by a wall 18 for holding the resiliently deformable members 5a, 5b in the correct position.

(22) As shown in FIGS. 2 and 4, a sleeve 16 is positioned between the screw thread 10 of said elongate member 9 and the resiliently deformable members 5a, 5b.

(23) This not only provides a guide for movement of the elongate member 9 through the resiliently deformable members 5a, 5b and the second abutment member 8b, but also prevents snagging on the screw thread 10 and so allows for smooth movement of the elongate member 9 through the resiliently deformable members 5a, 5b.

(24) It should be understood that various changes and modifications to the embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the disclosure and without diminishing its attendant advantages. It is therefore intended that such changes and modifications are covered by the appended claims.