FIG. 1 is a front elevational view of our design;

FIG. 2 is a transverse sectional view taken along line 2 — 2 in FIG. 1;

FIG. 3 is a rear elevational view of our design;

FIG. 4 is a top plan view of our design;

FIG, 5 is a bottom plan view of our design;

FIG. 6 is a top, right front perspective view embodying our design;

FIG. 7 is a right side elevational view of our design and the left side elevational view being a mirror image;

FIG. 8 is a sectional view taken along line 8 — 8 in FIG. 7; and,

FIG. 9 is a sectional view taken along line 9 — 9 in FIG. 7; and,

FIG. 10 is a bottom, left rear perspective view embodying our design and being some what enlarged from that of FIGS. 1 through 9.