FIG. 1 is a front perspective view of a back support pad assembly for a wheelchair showing our new design, the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front perspective view of a second embodiment of the back support pad assembly for a wheelchair;

FIG. 9 is a rear perspective view of a FIG. 8;

FIG. 10 is a front elevational view of FIG. 8;

FIG. 11 is a rear elevational view of FIG. 8;

FIG. 12 is a side elevational view of FIG. 8;

FIG. 13 is a top plan view of FIG. 8;

FIG. 14 is a bottom plan view of FIG. 8;

FIG. 15 is a rear perspective view of a third embodiment of the back support pad assembly for a wheelchair;

FIG. 16 is a front elevational view of FIG. 15;

FIG. 17 is a rear elevational view of FIG. 15;

FIG. 18 is a side elevational view of FIG. 15;

FIG. 19 is a top plan view of FIG. 15; and,

FIG. 20 is a bottom plan view of FIG. 15.