Jack

FIG. 1 is a perspective view of a jack in a lowered position, according to an embodiment of the invention; FIG. 2 is a first end view of the jack of FIG. 1 ; FIG. 3 is a second end view of the jack of FIG. 1 ; FIG. 4 is a first side view of the jack of FIG. 1 ; FIG. 5 is a second side view of the jack of FIG. 1 ; FIG. 6 is a top view of the jack of FIG. 1 ; FIG. 7 is a bottom view of the jack of FIG. 1 ; FIG. 8 is a perspective view of the jack of FIG. 1 in a raised position; FIG. 9 is a first end view of the jack of FIG. 8 ; FIG. 10 is a second end view of the jack of FIG. 8 ; FIG. 11 is a first side view of the jack of FIG. 8 ; FIG. 12 is a second side view of the jack of FIG. 8 ; FIG. 13 is a top view of the jack of FIG. 8 ; and, FIG. 14 is a bottom view of the jack of FIG. 8 . The broken lines in the drawings depict portions of the jack that form no part of the claimed design.