The ornamental design for a convertiblechair, substantially as shown and described.
FIG. 1 is a front perspective view of a convertible chair showing my
design.
FIG. 2 is a rear perspective view thereof.
FIG. 3 is an enlarged front perspective view wherein the seat and backrest
cover has been removed to convert the chair into position for use as a
loom.
The broken line disclosure of a shuttle, shuttle yarn, warp yarn, and
heddles are for illustrative purposes only.