FIG. 1 is a front perspective view of our design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a bottom plan view;
FIG. 6 is a cross sectional view taken along the line 6-6 of FIG. 2 and viewed in the direction of the arrows;
FIG. 7 is an enlarged fragmentary cross sectional view taken from FIG. 6;
FIG. 8 is a left side plan view;
FIG. 9 is a right side plan view;
FIG. 10 is a cross sectional view taken along the line 10-10 of FIG. 2 and viewed in the direction of the arrows;
FIG. 11 is a perspective view of the second embodiment thereof;
FIG. 12 is a front elevational view;
FIG. 13 is a rear elevational view;
FIG. 14 is a top plan view;
FIG. 15 is a bottom plan view;
FIG. 16 is a cross sectional view taken along the line 6-6 of FIG. 2 and viewed in the direction of the arrows;
FIG. 17 is an enlarged fragmentary cross sectional view taken from FIG. 6;
FIG. 18 is a left side plan view;
FIG. 19 is a right side plan view; and,
FIG. 20 is a cross sectional view taken along the line 10-10 of FIG. 2 and viewed in the direction of the arrows.