A problem with existing articulating beds are that they do not have a flexible mattress support member and lumbar support adjustment with reduced mattress interference. The invention aims to solve at least such problem by providing an articulating bed comprising a frame having side frame members (14) and a rigid cross frame member (16) extending between the side frame members (14). A flexible support member (12) is secured to the rigid cross frame member. Support arms (20) engage an upper body portion (13) of the flexible support member with lubricious support and are rotatable through a range of motion from an aligned position with the side frame members to a fully elevated position angularly supporting the upper body portion in a raised position. A leg portion adjustment member (24) engages the flexible support member (12) at a knee position intermediate a thigh portion (15) and a leg portion (19) of the flexible support member (12). The leg portion adjustment member (24) is rotatable through a range of motion from an aligned position with the side frame members (14) to a fully elevated position placing the knee position at an elevated location with angular positioning of the thigh portion and leg portion. The lubricious support comprises a plurality of shuttles movable on the support arms (20).
