Impact absorbing structure and seat structure

• US 20030116999A1
• Filed: 12/18/2002
• Published: 06/26/2003
• Est. Priority Date: 12/20/2001
• Status: Active Grant

• Current Assignee: Delta Tooling Co., Ltd.
• Original Assignee: Delta Tooling Co., Ltd.
• Inventors: Takata, Yasuhide, Fujita, Etsunori, Sakamoto, Yutaka
• Granted Patent: US 6,926,358 B2
• Time in Patent Office: Days
• US Class Current: 297/216.13
• CPC Class Codes: B60N 2/4228 due to impact coming from the rear
• CPC Class Codes: B60N 2/42736 of the whole seat
• CPC Class Codes: B60N 2/42754 of the cushion
• CPC Class Codes: B60N 2/7094 Upholstery springs

Abstract

The object of the present invention is to suppress rebound of a human body when receiving a large impact load accompanying a collision or the like. A back frame member 20 and a seat frame member 10 are individually formed by welding or caulking, and a link member 30 for connecting both is attached to the back frame member 20 and the seat frame member 10 by welding or caulking. Each of the frame members is provided with a cushioning member as a tension structure. Upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the tension of the cushioning member provided as the tension structure lowers to be able to exhibit high damping characteristics.

Claims

1. An impact absorbing structure having a cushioning member provided as a tension structure with a tension field formed by being supported on a frame member,

wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, said frame member deforms in a direction to reduce the tension of said tension structure.

4. The impact absorbing structure according to any one of claim 1 to claim 3,

wherein said frame members disposed with a predetermined distance therebetween with said tension structure put up thereon deform in a direction to get closer to each other upon receipt of an impact vibration or an impact force at a predetermined magnitude or more.

5. The impact absorbing structure according to any one of claim 1 to claim 3,

wherein said cushioning member is formed of a three-dimensional net member formed by connecting together a pair of ground knitted fabrics disposed apart from each other using connecting fibers, or a structure with urethane comprising a two-dimensional fabric or a two-dimensional knitting and a urethane layer layered on the two-dimensional fabric or the two-dimensional knitting.

2. An impact absorbing structure having a cushioning member provided as a tension structure with a tension field formed by being supported on a frame member,

wherein at least a part of said cushioning member is provided in a state of contracting in a tangential direction of said cushioning member in a normal state, and upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the contraction state of said cushioning member is released.

3. An impact absorbing structure having a cushioning member provided as a tension structure with a tension field formed by being supported on a frame member,

wherein at least a part of said cushioning member is provided in a state of contracting in a tangent direction of said cushioning member in a normal state, and

wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the contraction state of said cushioning member is released, and said frame member deforms in a direction to reduce the tension of said tension structure.

6. A seat structure, comprising:

a back frame member;

a seat frame member; and

a cushioning member provided as a tension structure with a tension field formed by being supported on each of said frame members,

wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, at least one of said frame members deforms in a direction to reduce the tension of said tension structure.

9. The seat structure according to any one of claim 6 to claim 8,

wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, a side frame portion constituting said back frame member deforms to fall inward to reduce the tension of said tension structure.

10. The seat structure according to any one of claim 6 to claim 8,

wherein said back frame member is provided with a bending action portion that bends rearward when receiving an impact vibration or an impact force at a predetermined magnitude or more.

11. The seat structure according to any one of claim 6 to claim 8,

wherein said seat frame member has a lifting mechanism that lifts a front end side of said seat frame member when receiving an impact vibration or an impact force at a predetermined magnitude or more.

12. The seat structure according to any one of claim 6 to claim 8,

wherein said back frame member for supporting said back cushioning member and said seat frame member for supporting said seat cushioning member are individually formed by welding or caulking, and

wherein a back arm member and a seat arm member are attached to said back frame member and said seat frame member respectively by welding or caulking to connect both through a reclining adjuster.

13. The seat structure according to claim 12,

wherein said reclining adjuster is attached to both said back arm member and said seat arm member by welding or caulking.

14. The seat structure according to any one of claim 6 to claim 8,

wherein a slide adjuster for moving said seat frame member back and forth along a rail member fixed on a support floor surface is attached to said seat frame member and/or said seat arm member by welding or caulking.

15. The seat structure according to any one of claim 6 to claim 8,

wherein said back frame member is formed in a shape of a frame having a lower frame portion disposed to run between lower portions of said pair of side frame portions, and a space portion above said lower frame portion for permitting said back cushioning member to protrude further to the rear than said lower frame portion.

16. The seat structure according to any one of claim 6 to claim 8,

wherein a spring mechanism for serving functions of complementing a stroke of said cushioning members during seating and relieving vibration, comprises a torsion bar and a movable portion connected to said torsion bar, and said movable portion is provided at any position within a range of said cushioning members corresponding to the range from the vicinity of the waist portion to the vicinity of the haunches.

17. The seat structure according to claim 16,

wherein said movable portion is disposed in a width direction under a rear portion of said seat cushioning member and forced downward by said torsion bar in a normal state, and pulls downward said seat cushioning member by said torsion bar when the tension of said back cushioning member lowers due to receipt of an impact vibration or an impact force at a predetermined magnitude or more.

18. The seat structure according to claim 16,

wherein said movable portion is disposed in a width direction behind a lower portion of said seat cushioning member and forced rearward by said torsion bar in a normal state, and pulls rearward said seat cushioning member by said torsion bar when the tension of said back cushioning member lowers due to receipt of an impact vibration or an impact force at a predetermined magnitude or more.

19. The seat structure according to any one of claim 6 to claim 8,

wherein said cushioning member is formed of a three-dimensional net member formed by connecting together a pair of ground knitted fabrics disposed apart from each other using connecting fibers, or a structure with urethane comprising a two-dimensional fabric or a two-dimensional knitting and a urethane layer layered on the two-dimensional fabric or the two-dimensional knitting.

7. A seat structure, comprising:

a back frame member;

a seat frame member; and

a cushioning member provided as a tension structure with a tension field formed by being supported on each of said frame members,

wherein at least a part of said cushioning member is provided in a state of contracting in a tangential direction of said cushioning member in a normal state, and upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the contraction state of said cushioning member is released.

8. A seat structure, comprising:

a back frame member;

a seat frame member; and

a cushioning member provided as a tension structure with a tension field formed by being supported on each of said frame members,

wherein at least a part of said cushioning member is provided in a state of contracting in a tangent direction of said cushioning member in a normal state, and

wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the contraction state of said cushioning member is released, and said frame member deforms in a direction to reduce the tension of said tension structure.