Seat backing having an inclined sitting face

Abstract

A seat backing formed by a closed hollow plastic jacket defining a chamber fillable with a fluid and a valve, provided in the jacket, serving for feeding the fluid to the chamber. The invention includes a bearing region for holding a seat; a sitting region for receiving a sitting person; and a transition region formed between the bearing and sitting regions. The sitting region includes an upper sitting region and a lower sitting region. The transition region includes upper and lower sections formed around the sitting region and the bearing region to be integrally interconnect the bearing region and the sitting region. The area of sitting and bearing regions increases when the seat backing is used.

1 . A seat backing formed by a closed hollow plastic jacket defining a chamber fillable with a fluid and a valve provided in the jacket, serving for feeding the fluid to the chamber, said seat backing comprising: 
 a bearing region intended for putting on a seat;    a sitting region intended for receiving a sitting person which is inclined relative to the bearing region when placed on the seat; and    a transition region formed between the bearing and the sitting region and interconnecting the regions; and wherein    the sitting region comprises an upper sitting region which is proximate a spine of a person sitting on the sitting region and a lower sitting region which is proximate the legs of the person sitting on the sitting region;    the transition region comprises upper and lower sections which are joined to define a periphery of the hollow plastic jacket and which extend inwardly from the periphery to join the sitting region and the bearing region and which sitting and bearing regions are separated only by the fluid with a distance of separation inside the jacket when filled with fluid between the upper and lower sections increasing from a minimum spacing at the lower sitting region toward the upper sitting region to a greater spacing whereby the person sitting on the sitting region may rock the spine forward and backward to vary the distance of separation between the upper and lower sections to a greater extent proximate the upper sitting region than proximate the lower sitting region; and    the hollow plastic jacket is elastic so as in response to movement of the person sitting on the sitting region causes the periphery to increase to provide additional sitting region and bearing region area.    
     
     
         2 . The seat backing of  claim 1 , wherein an angle between the sitting region and the bearing region is about 4° to about 30°.  
     
     
         3 . The seat backing of  claim 2  wherein the angle is about 4° to 14°.  
     
     
         4 . The seat backing of claims  1 , wherein the bearing region is defined substantially symmetrically to the sitting region of the transition region.  
     
     
         5 . The seat backing of  claim 1 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower section.  
     
     
         6 . The seat backing of  claim 2 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower section.  
     
     
         7 . The seat backing of  claim 3 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower.  
     
     
         8 . The seat backing of  claim 4 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower section.  
     
     
         9 . The seat backing of  claim 1 , wherein the transition region has a cross section with at least some part thereof is curved or bent.  
     
     
         10 . The seat backing of  claim 1 , wherein the transition region has a cross section of which at least some part thereof is non-curved or has at least one straight section therein.  
     
     
         11 . The seat backing of  claim 1 , wherein the transition region forms a continuous marginal edge in a region of the lower section.  
     
     
         12 . The seat backing of  claim 1 , wherein the seat backing is at least partially made of thermoplastic plastic.  
     
     
         13 . The seat backing of  claim 1 , wherein the plastic jacket has protrusions made of a same material as the plastic jacket.  
     
     
         14 . The seat backing of  claim 13 , wherein the protrusions made of the same material produce a slip-resistant profile.  
     
     
         15 . The seat backing of  claim 1 , wherein a surface of the plastic jacket comprises a slip-resistant surface in regions of the sitting region or bearing region.  
     
     
         16 . The seat backing of  claim 1 , wherein the sitting region and the bearing region are substantially flat in an unloaded state.  
     
     
         17 . The seat backing of  claim 16 , wherein in the unloaded state the transition region, in the upper section comprises a curved cross section or a cross section of which at least some sections are straight, and in the lower section, two regions meet in an acute angle and form an edge.  
     
     
         18 . The seat backing of  claim 2 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower section.  
     
     
         19 . The seat backing of  claim 3 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at the upper section than at the lower section.  
     
     
         20 . The seat backing of  claim 4 , wherein the upper section has a larger area than an area of the lower section which provides a greater flexibility between the sitting and bearing regions at upper section than at the lower section.  
     
     
         21 . The seat backing of  claim 1 , wherein the transition region has a cross section of which at least some part thereof is non-curved or has at least one straight section therein.  
     
     
         22 . The seat backing of  claim 3 , wherein the transition region has a cross section of which at least some part thereof is non-curved or has at least one straight section therein.  
     
     
         23 . The seat backing of  claim 4 , wherein the transition region has a cross section of which at least some part thereof is non-curved or has at least one straight section therein.