Lumbar support mechanism and adjustable bed therewith

An adjustable bed, comprising:

• a frame structure having a back frame and a foot frame;
• a plurality of platforms disposed on the frame structure, the plurality of platforms comprising at least a back platform having at least one opening;
• and
• a lifting mechanism positioned between the frame structure and the plurality of platforms for operably adjusting positions of at least one of the plurality of platforms so as to adjust the adjustable bed at a desired position;
• and
• a lumbar support mechanism received in the at least one opening of and secured to the back platform for operably providing lumbar support, wherein the lumbar support mechanism comprises:
• a first lumbar lifting assembly and a second lumbar lifting assembly, each of the first and second lumbar lifting assemblies comprising:
• a fixing bracket, a first support leg, a second support leg, a bearing member, and a lifting support bracket,
• wherein the fixing bracket is secured to the back platform;
• wherein the first support leg has a lower end portion pivotally connected to the bearing member that is operably movable in the fixing bracket, and an upper portion pivotally connected to the lifting support bracket;
• and
• wherein the second support leg has a lower end portion pivotally connected to the fixing bracket, and an upper end portion pivotally connected to a middle portion of the first support leg;
• a lumbar support member connected to the lifting support brackets of the first lumbar lifting assembly and the second lumbar lifting assembly;
• a linkage member pivotally connected to the bearing member of the first lumbar lifting assembly and the second lumbar lifting assembly;
• and
• a lumbar support actuator pivotally connected to the bearing member of one of the first lumbar lifting assembly and the second lumbar lifting assembly for operably driving the bearing members so as to move the linkage member between a first position and a second position,
• wherein the lumbar support member is operably movable between a retracted position and an ejected position when the linkage member moves between the first and second positions, and wherein the lumbar support is provided when the lumbar support member is in the ejected position.