Impact absorbing structure and seat structure
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.
1. 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 each side frame portion constituting said back frame member is respectively provided with a shaping frame portion protruding forward from said side frame portion, and said cushioning member supported on said back frame is put up between the shaping frame portions; and
wherein upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, said shaping frame portions protruding forward from said side frame portion deform to fall toward each other to reduce the tension of said cushioning member supported on said back frame.
2. The seat structure according to claim 1 ,
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.
3. The seat structure according to claim 1 ,
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.
4. The seat structure according to claim 3 ,
wherein said reclining adjuster is attached to both said back arm member and said seat arm member by welding or caulking.
5. The seat structure according to claim 1 ,
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.
6. The seat structure according to claim 1 ,
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.
7. The seat structure according to claim 1 , 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.
8. The seat structure according to claim 1 , 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.