Adjustable electric bed

1. An adjustable electric bed ( 1 ), including comprising:

a bed frame, a plurality of bed boards articulated mutually and a driving device for driving the plurality of bed boards to rise and fall;

the plurality of bed boards at least comprise a head bed board ( 2 ), a fixed bed board ( 3 ), a leg bed board ( 4 ) and a foot bed board ( 5 ) which are articulated successively, the fixed bed board ( 3 ) is fixed with the bed frame;

wherein, an undersurface of the head bed board ( 2 ) is fixedly provided with a head connector ( 31 ), the driving device at least comprises a head motor and a leg motor, two ends of the head motor are respectively articulated with the bed frame and the head connector ( 31 ), an undersurface of the leg bed board ( 4 ) is fixedly provided with a leg connector ( 32 ), two ends of the leg motor are respectively articulated with bed frame and the leg connector ( 32 ).

2. The adjustable electric bed ( 1 ) according to claim 1 , wherein the foot bed board ( 5 ) is connected with the bed frame by a movable support bar ( 38 ), one end of the support bar ( 38 ) is articulated with said bed frame, the other end is articulated with the foot bed board ( 5 ), and when the leg motor drives the leg bed board ( 4 ) to rise and fall, the support bar supports the foot bed board ( 5 ).

3. The adjustable electric bed ( 1 ) according to claim 1 , wherein the bed frame comprises a fixed platform ( 13 ) protruding upwards from a horizontal plane of the bed frame and several fixed blocks ( 14 ), the fixed platform ( 13 ) is used for fixing the fixed bed board ( 3 ), said several fixed blocks ( 14 ) play a role of supporting when the head bed board ( 2 ), the leg bed board ( 4 ) and the foot bed board ( 5 ) are at a horizontal plane.

4. The adjustable electric bed ( 1 ) according to claim 3 , wherein at least one of said several fixed blocks ( 14 ) is fixed at a position on the bed frame corresponding to a hinge joint of the leg bed board ( 4 ) and the foot bed board ( 5 ) at a horizontal plane.

5. The adjustable electric bed ( 1 ) according to claim 1 , wherein each one of the head motor and the leg motor comprises a drive end and a push rod, for the head motor the drive end ( 23 ) is articulated with the bed frame and the push rod end ( 24 ) is articulated with the head bed board ( 2 ); for the leg motor the drive end ( 21 ) is articulated with the bed frame and the push rod end ( 22 ) is articulated with the leg bed board ( 4 ).

6. The adjustable electric bed ( 1 ) according to claim 5 , wherein the drive ends and the push rod ends of the head motor and the leg motor are located in two different horizontal planes respectively.

7. The adjustable electric bed ( 1 ) according to claim 1 , wherein the head connector ( 31 ) and the leg connector ( 32 ) are respectively arranged at the undersurfaces of the head bed board ( 2 ) and of the leg bed board ( 4 ) along a straight line.

8. The adjustable electric bed ( 1 ) according to claim 7 , wherein the head connector ( 31 ) and the leg connector ( 32 ) are arranged respectively along a center lines of the head bed board ( 2 ) and of the leg bed board ( 4 ).

9. The adjustable electric bed ( 1 ) according to claim 1 , wherein a length of the head connector ( 31 ) and a length of the leg connector ( 32 ) are respectively longer than a half length of the head bed board ( 2 ) and a half length of the leg bed board ( 4 ).

10. The adjustable electric bed ( 1 ) according to claim 1 , wherein the bed frame is made of cold-drawn steel for furniture tube.