Seat assembly for wheelchair

Abstract

A seat assembly can be mounted on various wheelchair bases. The seat assembly enables the seat width and backrest width to be adjusted independently of each other. A backrest has a plurality of open slots, the number and orientation of which contributes to depth, width, and height adjustment of the backrest as well as angular adjustment of lateral supports to permit the backrest to conform to the anatomical curves of a user. A backrest foam assembly comprises multiple foam sections that are adapted to be positioned relative to each other and thereby vary the overall width of the assembly. A cover comprises multiple sections, each covering a foam section. A multi-position adjustable armrest assembly combines large-scale and small-scale adjustments, which provides a broad range of adjustment for the armrest and its position. A power recline mechanism with programmable shear reduction includes a dual rotary recline mechanism.

1 . A seat assembly for a wheelchair, wherein the seat assembly can be mounted on various wheelchair bases.  
     
     
         2 . A seat assembly for a wheelchair, wherein the seat assembly has a seat and a backrest, the seat having a width that is adjustable and the backrest having a width that can be adjustable independently of the seat.  
     
     
         3 . A backrest for a wheelchair, wherein backrest is adjustable to conform to the anatomical curves of a user.  
     
     
         4 . The backrest of  claim 3 , wherein the backrest is adjustable in width, height, and depth.  
     
     
         5 . The backrest of  claim 4 , further comprising a plurality of open slots, the number and orientation of which contributes to the depth, width, and height adjustment of the backrest as well as angular adjustment of lateral supports.  
     
     
         6 . A backrest foam assembly comprising foam comprising multiple sections that are adapted to be positioned relative to each other and thereby vary the overall width of the foam.  
     
     
         7 . The backrest foam assembly of  claim 6 , further comprising cover covering each of the foam sections.  
     
     
         8 . A multi-position adjustable armrest assembly that combines large-scale and small-scale adjustments, which provides a broad range of adjustment for the armrest and its position.  
     
     
         9 . A power recline mechanism with programmable shear reduction.  
     
     
         10 . The power recline mechanism of  claim 1  comprising a dual rotary recline mechanism.