Mounting rail assembly for a roller shade

[0001]FIG. 1 is a front perspective view of a mounting rail assembly for a roller shade showing my new design;

[0002]FIG. 2 is a front elevational view thereof;

[0003]FIG. 3 is a rear elevational view thereof;

[0004]FIG. 4 is a right side elevational view thereof;

[0005]FIG. 5 is a left side elevational view thereof;

[0006]FIG. 6 is a top plan view thereof;

[0007]FIG. 7 is a bottom plan view thereof; and,

[0008]FIG. 8 is a rear perspective view thereof.

[0009]In FIGS. 1-3 and 6-8, the mounting rail assembly for a roller shade is shown with break lines. The break lines symbolize breaks in the length of the article in which the claimed design is embodied. The appearance of any portion of the article between the break lines forms no part of the claimed design.