Rock tumbler

[0001]FIG. 1 is a front, left and top perspective view of a rock tumbler showing my new design;

[0002]FIG. 2 is a rear, right and bottom perspective view thereof;

[0003]FIG. 3 is a front elevational view thereof;

[0004]FIG. 4 is a rear elevational view thereof;

[0005]FIG. 5 is a left side elevational view thereof;

[0006]FIG. 6 is a right side elevational view thereof;

[0007]FIG. 7 is a top plan view thereof;

[0008]FIG. 8 is a bottom plan view thereof; and,

[0009]FIG. 9 is an enlarged view of portion 9 shown in FIG. 2.

[0010]The dash-dash broken lines in the drawings depict portions of the rock tumbler that form no part of the claimed design. The dot-dash broken lines represent boundaries of the enlarged portions and form no part of the claimed design.