FIG. 1 is a front elevational view of a first embodiment of my design;
FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1;
FIG. 3 is an enlarged view of a detail taken at the circular section line of FIG. 2;
FIG. 4 is a cross-sectional view taken along the line 4-4 of FIG. 1;
FIG. 5 is an enlarged view of a detail taken at the circular section line of FIG. 4;
FIG. 6 is an enlarged view of a detail taken at the circular section line of FIG. 4;
FIG. 7 is a front elevational view of a second embodiment of my design;
FIG. 8 is a cross-sectional view taken along the line 8-8 of FIG. 7;
FIG. 9 is an enlarged view of a detail taken at the circular section line of FIG. 8;
FIG. 10 is a cross-sectional view taken along the line 10-10 of FIG. 7;
FIG. 11 is an enlarged view of a detail taken at the circular section line of FIG. 10;
FIG. 12 is an enlarged view of a detail taken at the circular section line of FIG. 10.
FIG. 13 is a front elevational view of a third embodiment of my design;
FIG. 14 is a cross-sectional view taken along the line 14-14 of FIG. 13;
FIG. 15 is an enlarged view of a detail taken at the circular section line of FIG. 14;
FIG. 16 is a cross-sectional view taken along the line 16-16 of FIG. 13;
FIG. 17 is an enlarged view of a detail taken at the circular section line of FIG. 16;
FIG. 18 is an enlarged view of a detail taken at the circular section line of FIG. 16;
FIG. 19 is a front elevational view of a fourth embodiment of my design;
FIG. 20 is a cross-sectional view taken along the line 20-20 of FIG. 19;
FIG. 21 is an enlarged view of a detail taken at the circular section line of FIG. 20;
FIG. 22 is a cross-sectional view taken along the line 22-22 of FIG. 19;
FIG. 23 is an enlarged view of a detail taken at the circular section line of FIG. 22;
FIG. 24 is an enlarged view of a detail taken at the circular section line of FIG. 22;
FIG. 25 is a front elevational view of a fifth embodiment of my design;
FIG. 26 is a cross-sectional view taken along the line 26-26 of FIG. 25;
FIG. 27 is an enlarged view of a detail taken at the circular section line of FIG. 26;
FIG. 28 is a cross-sectional view taken along the line 28-28 of FIG. 25;
FIG. 29 is an enlarged view of a detail taken at the circular section line of FIG. 28; and,
FIG. 30 is an enlarged view of a detail taken at the circular section line of FIG. 28.