Patent ID: 7174583

Claim:
A mattress assembly having an adjustable height, comprising: a. a first mattress foundation member comprising: i. a generally planar and essentially rigid top surface having an upper side and a lower side; and ii. a plurality of first spacer members disposed on the lower side; and b. a second mattress foundation member comprising: i. a generally planar and essentially rigid top surface having an upper side and a lower side; and ii. a plurality of second spacer members or openings, or both, disposed on the upper side of the second mattress foundation member and configured to mate with the first spacer members when the first mattress foundation member is placed on top of the second mattress foundation member so that the lower side of the first mattress member faces the upper side of the second mattress member to define a first height disposed in a first orientation; wherein at least a second height of the assembly different from said first height is defined by at least a second orientation of the first mattress foundation member relative to and overlying the second mattress foundation member and different from said first orientation.