Vehicle seat

Abstract

A vehicle seat 10 of the present invention uses a net member of a three-dimensional structure in which a front mesh layer and a back mesh layer are connected with a number of piles, as a covering member. A seat back covering member 30 has an upper end portion 30 a thereof fixed at an upper end frame 22 a , while a seat cushion covering member 40 has a front end portion 40 e thereof fixed to a front end frame 21 a , and side portions 30 c of the seat back covering member 30 is supported to be movable up and down with respect to guide frames 22 d . Both the covering members 30 and 40 are placed at an extremely low elongation percentage. Accordingly, the seat is excellent in vibration absorption characteristic, because movements of a support member 50 and metal springs 60 disposed under the seat cushion covering member 40 are not restricted and a mechanism of vibration absorption by them is not hindered.

What is claimed is:  
     
         1 . A vehicle seat using a net member of a three-dimensional structure in which a front mesh layer and a back mesh layer are connected with a number of piles, as a covering member, 
 wherein of said covering member, an upper end portion of a seat back section and a front end portion of a seat cushion section are fixed to frame members, and side portions of the seat back section are supported to be movable up and down with respect to frame members.    
     
     
         2 . The vehicle seat according to  claim 1 , 
 wherein said covering member are supported by the frame members at an elongation percentage of less than 5% under no load.    
     
     
         3 . The vehicle seat according to  claim 1 , further comprising: 
 a support member connected to and supported by any of the frame members placed to be laterally spaced, under the covering member constituting said seat cushion section, for supporting the covering member constituting said seat cushion section and giving a restoring force thereto.    
     
     
         4 . The vehicle seat according to  claim 3 , 
 wherein belt-shaped members are laid across said support member and the frame members to control a reaction force after deformation of said metal spring.    
     
     
         5 . The vehicle seat according to  claim 3 , further comprising: 
 a soft cushion member layer between said support member and the covering member.    
     
     
         6 . The vehicle seat according to  claim 5 , 
 wherein said support member comprises a flat-type elastic member, and is placed with a hard cushion member layer between said support member and said soft cushion member layer.    
     
     
         7 . The vehicle seat according to  claim 1 , 
 wherein while the covering member constituting said seat cushion section and the covering member constituting said seat back section are formed of net members independent from each other, rear end portion of the covering member constituting the seat cushion section and a lower end portion of the covering member constituting the seat back section are connected.    
     
     
         8 . The vehicle seat according to  claim 7 , 
 wherein the net member as the covering member constituting said seat cushion section is placed so that a direction in which it is more stretchable is along a direction connecting the rear end portion and the front end portion of the seat cushion section, and the net member as the covering member constituting said seat back section is placed so that a direction in which it is more stretchable is along a direction connecting side portions of the seat back section.    
     
     
         9 . The vehicle seat according to  claim 7 , 
 wherein the net members as the respective covering members constituting said seat cushion section and the seat back section are respectively placed so that each direction in which they are more stretchable is along each direction connecting the respective side portions.    
     
     
         10 . The vehicle seat according to  claim 1 , 
 wherein the net member as the covering member constituting said seat back section is formed of a soft material with a smaller spring constant than the net member as the covering member constituting said seat cushion section.    
     
     
         11 . The vehicle seat according to  claim 1 , 
 wherein a cushion member layer for supplementing an elastic force of the covering member is provided on a back side of the covering member constituting said seat back section.    
     
     
         12 . The vehicle seat according to  claim 11 , 
 wherein said cushion member layer is formed into a final posture support form in which said covering member constituting the seat back section is folded toward the back side from both sides, both end edges are joined in a substantially center portion, the substantially center portion is located in a rearward position from both side portions.    
     
     
         13 . The vehicle seat according to  claim 1 , 
 wherein a member with stretchability for biasing the covering member in a direction to contract toward substantially the center portion is laid on a back face of the covering member constituting said seat back section.    
     
     
         14 . The vehicle seat according to  claim 1 , 
 wherein both side portions of the covering members constituting said seat back section and the seat cushion section are folded toward the back side respectively, and parts thereof located on the frame members are formed into at least a twofold structure.    
     
     
         15 . The vehicle seat according to  claim 1 , 
 wherein the covering member constituting said seat back section is supported by the frame members so that both side portions protrude forward from an inner part thereof and the covering member constituting said seat cushion section is supported by the frame members so that both side portions protrude upward from an inner part thereof.    
     
     
         16 . The vehicle seat according to  claim 15 , 
 wherein border portions between the both side portions in the covering members constituting said seat back section and the seat cushion section, and the inner parts are formed into a groove shape.    
     
     
         17 . The vehicle seat according to  claim 16 , 
 wherein said border portions are formed by joining a front mesh layer, piles and a back mesh layer of the net member constituting the covering member to one another by vibration welding means.    
     
     
         18 . The vehicle seat according to  claim 16 , 
 wherein said border portions are formed by joining a front mesh layer, piles and a back mesh layer of the net member constituting the covering member to one another in a half-crushed state by vibration welding means and thereafter, by further applying sewing means thereto.