The ornamental design for a lockingbracket for an air purification device, as shown and described.
FIG. 1 illustrates a perspective view of a locking bracket for an air purification device showing the new design;
FIG. 2 illustrates a front elevation view thereof;
FIG. 3 illustrates a rear elevation view thereof;
FIG. 4 illustrates a top plan view thereof;
FIG. 5 illustrates a bottom plan view thereof;
FIG. 6 illustrates a right side elevation view thereof;
FIG. 7 illustrates a left side elevation view thereof; and,
FIG. 8 illustrates a cross-sectional view thereof taken in the direction of line 8-8 in FIG. 2.
The evenly spaced broken lines and unshaded areas depict portions of the locking bracket for an air purification device that form no part of the claimed design. The dot-dash-dot broken lines denote the boundaries of the claimed design and form no part thereof. In FIG. 2, the dot-dash-dot broken lines denote the direction of the cross-sectional view of FIG. 8 and form no part of the claimed design.