Backrest

FIG. 1 is a front elevation view of a backrest, showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a rear perspective view thereof;

FIG. 9 is a cross sectional view taken along the vertical center line of the backrest; and,

FIG. 10 is an enlarged detail view of encircled area 10 shown in FIG. 9 .

The broken line portion of the figure drawings is included to show portions of the article that forms no part of the claimed design. The evenly dashed broken line circle in FIG. 9 and FIG. 10 illustrate the border of the enlarged detailed view and forms no part of the claimed design.