The ornamental design for a wheelchairsupportplatform, as shown and described.
FIG. 1 is a top-front-left perspective view of a wheelchair support platform showing my new design;
FIG. 2 is a bottom-rear-right perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left-side elevational view thereof, the right-side elevational view being mirrored thereto;
FIG. 6 is a front elevational view thereof, the rear elevational view being mirrored thereto;
FIG. 7 is a top-front-left perspective view of the present invention, wherein the present invention is shown mounted to a tilt-actuator while retaining a wheelchair; and,
FIG. 8 is top-front-left perspective view thereof, wherein the present invention is shown in a tilted configuration.
The dashed line showing an exemplary retainer slot in FIGS. 1, 3, 7, and 8; and the exemplary tilt-actuator and wheelchair in FIGS. 7 and 8 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.