FIG. 1 is a front perspective view of a swing seat showing our new design, it being understood that the broken line showing the child and the chain are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front perspective view of the swing seat shown by itself on an enlarged scale with the restraining belt in unbuckled position;

FIG. 3 is a front elevational view of FIG. 2;

FIG. 4 is a right side elevational view of FIG. 2;

FIG. 5 is a rear elevational view of FIG. 2;

FIG. 6 is a left elevational view of FIG. 2;

FIG. 7 is a top elevational view of FIG. 2;

FIG. 8 is a bottom elevational view of FIG. 2; and,

FIG. 9 is a top elevational view of FIG. 2 showing the restraining belt in an unbuckled position.