The ornamental design for a door closer, as shown and described.
FIG. 1 is a front elevational view of a door closer showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof, shown in an alternate position;
FIG. 7 is a perspective view thereof, showing the article in use; and,
FIG. 8 is another perspective view thereof, showing the article in use.
The broken lines showing an environment are for illustrative purposes only. The other broken lines indicate disclaimed portions of the design. None of the broken lines form part of the claimed design.
Swinging door with a door closer having a slide rail at the door frame with a suspension system for adjusting the height of the slide rail with respect to the door frame