Patent ID: 8068924

Claim:
A method for coordinative control of back and knee bottom sections of an adjustable bed during which the back and knee bottom sections are raised and/or lowered according to a preset action pattern, said preset action pattern comprising the steps of raising the knee bottom section to prevent a person in the bed from sliding toward a foot of the bed as the back bottom section is elevated, and then lowering the knee bottom section to prevent a person in the bed from feeling abdominal pressure as their legs approach their upper body, said raising and lowering of the knee bottom section occurring simultaneously with the elevation of the back bottom section, said method comprising the steps of: (a) detecting present starting (initial) inclination angles of the back and knee bottom sections for identifying their present starting inclination angles; (b) comparing identified present starting inclination angles of the back and knee bottom sections with the preset action pattern; (c) calculating from step (b) above a position on the back bottom section and knee bottom section of the preset action pattern nearest to the detected present starting inclination angles of the back and knee bottom sections; (d) raising and/or lowering the back and knee bottom sections to shift their starting inclination angles to predetermined inclination angles of nearest back and knee bottom section positions in the preset action pattern, for adapting a present coordinate position of the back and knee bottom sections in the preset action pattern; and then (e) raising and/or lowering the back and knee bottom sections according to said preset action pattern.