Adjustable bed with tilting mechanisms

An adjustable bed, comprising:

• a bed frame comprising a pair of side rails, an upper rail and a lower rail, wherein the pair of side rails is transversely spaced, longitudinally aligned and arranged parallel to each other, each side rail having a first end and an opposite, second end;
• and the upper rail and the lower rail are longitudinally spaced and transversely aligned, two ends of the upper rail being connected to the first ends of the pair of side rails and two ends of the lower rail being connected to the second ends of the pair of side rails such that the upper rail and the lower rail are parallel to each other, wherein each of the pair of side rails, the upper rail, the lower rail and the intermediate rail is a straight rail;
• a back lifting assembly comprising a back lifting bracket pivotally connected to the pair of side rails, and a back lifting actuator pivotally connected between the back lifting bracket and the upper rail for operably driving the back lifting bracket to pivotally move in an upward rotation direction or a downward rotation direction relative to the bed frame;
• a foot lifting assembly comprising a foot lifting bracket pivotally connected to the pair of side rails, and a foot lifting actuator pivotally connected between the foot lifting bracket and the lower rail for operably driving the foot lifting bracket to pivotally move in an upward rotation direction or a downward rotation direction relative to the bed frame;
• a tilting mechanism coupled to the bed frame for operably adjusting the bed frame from a horizontal position to a sloping position, or vice versa;
• a plurality of platforms disposed on the bed frame, the plurality of platforms comprising a head platform, a back platform, a waist platform, a seat platform, a thigh platform and a foot platform, wherein the back platform is movably coupled with the back lifting assembly, the seat platform is mounted onto the bed frame, and the thigh platform and the foot platform are movably coupled with the foot lifting assembly, wherein the waist platform is connected to the seat platform with one or more hinges, the seat platform, in turn, is connected to the thigh platform with one or more hinges, and the thigh platform, in turn, is connected to the foot platform with one or more hinges, and wherein the back platform and the waist platform are joined with angle limit brackets such that when the back platform moves in an upward rotation direction to a certain position, the angle limit brackets on the back platform are against the angle limit brackets on the waist platform so that further movement of the back platform in the same upward rotation direction causes the waist platform to move accordingly;
• and
• a head platform tilting actuator pivotally connected to the head platform and the back platform for operably adjusting the head platform in a tilting position or a flat position relative to the back platform, wherein the head platform tilting actuator comprises a motor member, an outer tube extending from the motor member, an activation rod received in the outer tube, engaged with the motor member and configured to be telescopically expandable or contractible relative to the outer tube according to a direction of motor rotation, wherein the motor member is pivotally connected to the back platform by a back platform mounting bracket that is directly mounted on the back platform, and the activation rod has a distal end portion pivotally connected to the head platform by a head platform mounting bracket having a reinforcement angle bracket holding a lower edge portion of the head platform and a head mounting bracket protruded from the reinforcement angle bracket and directly mounted onto the head platform.