The ornamental design for a collapsible brace member for a furniture support structure, as shown and described.
FIG. 1 is a top perspective view of a furniture support structure having identical brace members on opposing halves of the furniture support structure in an extended position;
FIG. 2 is a bottom perspective view of the brace member of one half of the furniture support structure of FIG. 1 in the extended position;
FIG. 3 is a side plan view of the brace member of FIG. 2 in the extended position;
FIG. 4 is a rear elevational view of the brace member of FIG. 2 in the extended position;
FIG. 5 is a bottom plan view of the brace member of FIG. 2 in the extended position;
FIG. 6 is a bottom perspective view of the furniture support structure of FIG. 1 in a collapsed position;
FIG. 7 is a bottom perspective view of the brace member of FIG. 2 in the collapsed position; and,
FIG. 8 is a bottom plan view of the brace member of FIG. 2 in the collapsed position.
The broken lines in the drawings are included for the purpose of illustrating unclaimed features and form no part of the claimed design.