Adjustable seat frame

Abstract

The invention relates to a seat frame for fitting to the running gear ( 15 ) of a wheelchair or pushchair, comprising a backrest ( 1 ), a seating surface ( 2 ) and feet support ( 3 ). The aim of the invention is to produce a seat frame which is particularly flexible and may be adjusted to various sizes. Said aim is achieved, whereby long recesses, in particular grooves ( 5 ), are arranged running longitudinally along both sides of the seating surface ( 2 ), for housing fixing elements. Preferably, long recesses, in particular grooves ( 5 ), are also arranged running longitudinally along both sides of the backrest ( 1 ), for housing fixing elements.

1 . A seat shell which is provided in particular for attachment to the chassis ( 15 ) of a wheelchair or a stroller, having a backrest ( 1 ), a seat ( 2 ), and a footrest ( 3 ), characterized in that oblong recesses running in its longitudinal direction, grooves ( 5 ) in particular, for receiving fastening elements are situated on both sides of the seat ( 2 ).  
     
     
         2 . The seat shell as recited in  claim 1 , characterized in that oblong recesses running in its longitudinal direction, grooves ( 5 ) in particular, for receiving fastening elements are situated on both sides of the backrest ( 1 ).  
     
     
         3 . The seat shell as recited in  claim 1  or  claim 2 , characterized in that a metallic extruded profile ( 4 ), having at least one longitudinal groove ( 5 ), is attached to each side of the seat ( 2 ) and/or the backrest ( 1 ).  
     
     
         4 . The seat shell as recited in  claim 3 , characterized in that the extruded profile ( 4 ) has a rectangular cross section and a continuous groove on all four sides.  
     
     
         5 . The seat shell as recited in one of claims  2  through  4 , characterized in that holding elements ( 16 ), connecting the backrest ( 1 ) to the chassis ( 15 ), are mounted in the longitudinal grooves ( 5 ) of the backrest ( 1 ).  
     
     
         6 . The seat shell as recited in one of claims  3  through  5 , characterized in that the extruded profiles ( 4 ) have a central longitudinal bore hole ( 7 ).  
     
     
         7 . The seat shell as recited in  claim 6 , characterized in that the bore hole ( 7 ) serves the purpose of receiving fastening elements.  
     
     
         8 . The seat shell as recited in  claim 7 , characterized in that the fastening elements support a headrest.  
     
     
         9 . The seat shell as recited in one of the preceding claims, characterized in that lateral support elements ( 34 ) are adjustably attached to the seat ( 2 ), and the fastening elements ( 38 - 41 ) serve the purpose of locking the support elements ( 34 ) in their adjusted position.  
     
     
         10 . The seat shell as recited in one of the preceding claims, characterized in that joining elements ( 8 ,  12 ,  27 ), connecting the backrest ( 1 ) to the seat ( 2 ), are mounted in the longitudinal grooves ( 5 ) of the seat ( 2 ).  
     
     
         11 . The seat shell as recited in  claim 10 , characterized in that the joining elements ( 8 ,  12 ,  27 ) are mounted in the longitudinal grooves ( 5 ) of the backrest ( 1 ).  
     
     
         12 . The seat shell as recited in one of the preceding claims, characterized in that joining elements ( 21 ), connecting the footrest ( 3 ) to the seat ( 2 ), are mounted in the longitudinal grooves ( 5 ) of the seat ( 2 ).  
     
     
         13 . The seat shell as recited in one of claims  10  through  12 , characterized in that the joining elements ( 8 ,  12 ,  21 ) have an articulated design.  
     
     
         14 . The seat shell as recited in  claim 13 , characterized in that the joining elements are composed of two base plates ( 8 ,  12 ) which are articulatedly connected to one another.  
     
     
         15 . The seat shell as recited in one of claims  10  through  14 , characterized in that the joining elements ( 8 ,  12 ,  21 ,  27 ) are mounted in the longitudinal grooves ( 5 ) using attachment screws ( 9 ).  
     
     
         16 . The seat shell as recited in  claim 15 , characterized in that the joining elements ( 8 ,  12 ) have elongate holes ( 19 ,  20 ) for receiving the attachment screws ( 9 ).  
     
     
         17 . The seat shell as recited in  claim 1 , characterized in that the chassis ( 15 ) to which the seat shell is attached has an adjustable design.  
     
     
         18 . The seat shell as recited in  claim 17 , characterized in that the chassis ( 15 ) has at least one receiver tube ( 30 ) and a clamp body ( 32 ) which is inserted into this receiver tube ( 30 ), the clamp body being lockable in a certain displacement area.  
     
     
         19 . The seat shell as recited in  claim 18 , characterized in that the clamp body ( 32 ) is attached to a frame ( 18 ) which extends vertically and transversally to the longitudinal direction of the seat ( 2 ).