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 a cross-sectional view taken along the line 3-3 of FIG. 1;
FIG. 4 is an enlarged view of a detail of FIG. 3;
FIG. 5 is a cross-sectional view taken along the line 5-5 of FIG. 1;
FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. 1;
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 a cross-sectional view taken along the line 9-9 of FIG. 7;
FIG. 10 is an enlarged view of a detail of FIG. 9;
FIG. 11 is a front elevational view of a third embodiment of my design;
FIG. 12 is a cross-sectional view taken along the line 12-12 of FIG. 11;
FIG. 13 is a cross-sectional view taken along the line 13-13 of FIG. 11;
FIG. 14 is an enlarged view of a detail of FIG. 13;
FIG. 15 is a front elevational view of a fourth embodiment of my design;
FIG. 16 is a cross-sectional view taken along the line 16-16 of FIG. 15;
FIG. 17 is a cross-sectional view taken along the line 17-17 of FIG. 15;
FIG. 18 is an enlarged view of a detail of FIG. 17;
FIG. 19 is a front elevational view of a fifth embodiment of my design;
FIG. 20 is a cross-sectional view taken along the line 20-20 of FIG. 19;
FIG. 21 is a cross-sectional view taken along the line 21-21 of FIG. 19;
FIG. 22 is an enlarged view of a detail of FIG. 21;
FIG. 23 is a front elevational view of a sixth embodiment of my design;
FIG. 24 is a cross-sectional view taken along the line 24-24 of FIGS. 23 and 28;
FIG. 25 is an enlarged view of a detail of FIG. 24;
FIG. 26 is a cross-sectional view taken along the line 26-26 of FIG. 23;
FIG. 27 is a cross-sectional view taken along the line 26-26 of FIG. 23;
FIG. 28 is a front elevational view of a seventh embodiment of my design;
FIG. 29 is a cross-sectional view taken along the line 29-29 of FIG. 23;
FIG. 30 is an enlarged view of a detail of FIG. 29;
FIG. 31 is a cross-sectional view taken along the line 31-31 of FIG. 28;
FIG. 32 is a cross-sectional view taken along the line 32-32 of FIG. 28;
FIG. 33 is a front elevational view of an eighth embodiment of my design;
FIG. 34 is a cross-sectional view taken along the line 34-34 of FIGS. 33 and 38;
FIG. 35 is an enlarged view of a detail of FIG. 34;
FIG. 36 is a cross-sectional view taken along the line 36-36 of FIG. 33;
FIG. 37 is a cross-sectional view taken along the line 37-37 of FIG. 33;
FIG. 38 is a front elevational view of a ninth embodiment of my design;
FIG. 39 is a cross-sectional view taken along the line 39-39 of FIG. 38;
FIG. 40 is an enlarged view of a detail of FIG. 39;
FIG. 41 is a cross-sectional view taken along the line 41-41 of FIG. 38;
FIG. 42 is a cross-sectional view taken along the line 42-42 of FIG. 38;
FIG. 43 is a front elevational view of a tenth embodiment of my design;
FIG. 44 is a cross-sectional view taken along the line 44-44 of FIGS. 43 and 48;
FIG. 45 is an enlarged view of a detail of FIG. 44;
FIG. 46 is a cross-sectional view taken along the line 46-46 of FIG. 43;
FIG. 47 is a cross-sectional view taken along the line 47-47 of FIG. 43;
FIG. 48 is a front elevational view of an eleventh embodiment of my design;
FIG. 49 is a cross-sectional view taken along the line 49-49 of FIG. 48;
FIG. 50 is an enlarged view of a detail of FIG. 49;
FIG. 51 is a cross-sectional view taken along the line 51-51 of FIG. 48;
FIG. 52 is a cross-sectional view taken along the line 51-51 of FIG. 48;
FIG. 53 is a front elevational view of a twelfth embodiment of my design;
FIG. 54 is a cross-sectional view taken along the line 54-54 of FIGS. 53 and 58;
FIG. 55 is an enlarged view of a detail of FIG. 54;
FIG. 56 is a cross-sectional view taken along the line 56-56 of FIG. 53;
FIG. 57 is a cross-sectional view taken along the line 57-57 of FIG. 53;
FIG. 58 is a front elevational view of a thirteenth embodiment of my design;
FIG. 59 is a cross-sectional view taken along the line 59-59 of FIG. 58;
FIG. 60 is an enlarged view of a detail of FIG. 59;
FIG. 61 is a cross-sectional view taken along the line 61-61 of FIG. 58;
FIG. 62 is a cross-sectional view taken along the line 62-62 of FIG. 58;
FIG. 63 is a front elevational view of a fourteenth embodiment of my design;
FIG. 64 is a cross-sectional view taken along the line 64-64 of FIGS. 63 and 66;
FIG. 65 is an enlarged view of a detail of FIG. 64;
FIG. 66 is a front elevational view of a fifteenth embodiment of my design;
FIG. 67 is a cross-sectional view taken along the line 67-67 of FIG. 66;
FIG. 68 is an enlarged view of a detail of FIG. 67;
FIG. 69 is a front elevational view of a sixteenth embodiment of my design;
FIG. 70 is a cross-sectional view taken along the line 70-70 of FIGS. 69 and 72;
FIG. 71 is an enlarged view of a detail of FIG. 70;
FIG. 72 is a front elevational view of a seventeenth embodiment of my design;
FIG. 73 is a cross-sectional view taken along the line 73-73 of FIG. 72;
FIG. 74 is an enlarged view of a detail of FIG. 73;
FIG. 75 is a front elevational view of an eighteenth embodiment of my design;
FIG. 76 is a cross-sectional view taken along the line 76-76 of FIGS. 75 and 78;
FIG. 77 is an enlarged view of a detail of FIG. 76;
FIG. 78 is a front elevational view of a nineteenth embodiment of my design;
FIG. 79 is a cross-sectional view taken along the line 79-79 of FIG. 78;
FIG. 80 is an enlarged view of a detail of FIG. 79;
FIG. 81 is a front elevational view of a twentieth embodiment of my design;
FIG. 82 is a cross-sectional view taken along the line 82-82 of FIGS. 81 and 84;
FIG. 83 is an enlarged view of a detail of FIG. 82;
FIG. 84 is a front elevational view of a twenty-first embodiment of my design;
FIG. 85 is a cross-sectional view taken along the line 85-85 of FIG. 84;
FIG. 86 is an enlarged view of a detail of FIG. 85;
FIG. 87 is a front elevational view of a twenty-second embodiment of my design;
FIG. 88 is a cross-sectional view taken along the line 88-88 of FIG. 87;
FIG. 89 is an enlarged view of a detail of FIG. 88;
FIG. 90 is a cross-sectional view taken along the line 90-90 of FIG. 87;
FIG. 91 is an enlarged view of a detail of FIG. 90;
FIG. 92 is a cross-sectional view taken along the line 92-92 of FIG. 87;
FIG. 93 is a cross-sectional view taken along the line 93-93 of FIG. 87;
FIG. 94 is a front elevational view of a twenty-third embodiment of my design;
FIG. 95 is a cross-sectional view taken along the line 95-95 of FIG. 94;
FIG. 96 is an enlarged view of a detail of FIG. 95;
FIG. 97 is a cross-sectional view taken along the line 97-97 of FIG. 94;
FIG. 98 is an enlarged view of a detail of FIG. 97;
FIG. 99 is a cross-sectional view taken along the line 99-99 of FIG. 94;
FIG. 100 is a cross-sectional view taken along the line 100-100 of FIG. 94;
FIG. 101 is a front elevational view of a twenty-fourth embodiment of my design;
FIG. 102 is a cross-sectional view taken along the line 102-102 of FIG. 101;
FIG. 103 is an enlarged view of a detail of FIG. 102;
FIG. 104 is a cross-sectional view taken along the line 104-104 of FIG. 101;
FIG. 105 is an enlarged view of a detail of FIG. 104;
FIG. 106 is a cross-sectional view taken along the line 106-106 of FIG. 101; and,
FIG. 107 is a cross-sectional view taken along the line 107-107 of FIG. 101.