Armchair

FIG. 1 is a top, front, right side perspective view of an armchair according to the present disclosure; FIG. 2 is a bottom, front, left side perspective view of the armchair shown in FIG. 1 ; FIG. 3 is a front view of the armchair shown in FIG. 1 ; FIG. 4 is a rear view of the armchair shown in FIG. 1 ; FIG. 5 is a left side view of the armchair shown in FIG. 1 ; FIG. 6 is a left side view of the armchair shown in FIG. 1 , shown in an alternative configuration; FIG. 7 is a right side view of the armchair shown in FIG. 1 ; FIG. 8 is a right side view of the armchair shown in FIG. 1 , shown in an alternative configuration; FIG. 9 is a top view of the armchair shown in FIG. 1 ; and, FIG. 10 is a bottom view of the armchair shown in FIG. 1 . The broken lines in the drawings represent portions of the article that form no part of the claimed design.