FIG. 1 is a front perspective view of the a mattress retention bracket for adjustable beds, and illustrates the design in its environment, namely, an adjustable bed frame, bed spring and bed mattress all shown in phantom outline;

FIG. 2 is a fragmentary enlarged rear perspective view of an adjustable bed frame, bed spring and bed mattress, all shown in phantom outline, and the mattress retention bracket for adjustable beds of this invention;

FIG. 3 is a perspective view of my design;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a side elevational view thereof; and,

FIG. 8 is a side elevational view opposite that illustrated in FIG. 7.