Electric bed frame

Abstract

An electric bed frame includes a fixed rack, a base plate disposed at a bottom side of the fixed rack, a movable rack rotatably connected with the fixed rack, an actuator rotatably connected with the fixed and movable racks and including a cylinder and a push lever movable into and out of the cylinder, and a supporting board disposed on the movable rack. When the push lever is moved out of the cylinder to make the actuator lengthened, the movable rack is swung upwardly relative to the fixed rack. When the push lever is moved into the cylinder to make the actuator shortened, the movable rack is swung downwardly relative to the fixed rack. As a result, it's convenient for users to use the electric bed frame in coordination with the traditional bed without damaging the traditional bed.

What is claimed is: 
     
         1 . An electric bed frame comprising:
 a fixed rack;   a base plate disposed at a bottom side of the fixed rack;   a movable rack rotatably connected with the fixed rack;   an actuator, two ends of which are rotatably connected with the fixed rack and the movable rack respectively, the actuator comprising a cylinder and a push lever extended from the cylinder and movable into and out of the cylinder, the movable rack being swung upwardly relative to the fixed rack when the push lever is moved out of the cylinder to make the actuator lengthened, the movable rack being swung downwardly relative to the fixed rack when the push lever is moved into the cylinder to make the actuator shortened; and   a supporting board disposed on a top side of the movable rack.   
     
     
         2 . The electric bed frame as claimed in  claim 1 , wherein the cylinder of the actuator is rotatably connected with the movable rack, and the push lever of the actuator is rotatably connected with the fixed rack. 
     
     
         3 . The electric bed frame as claimed in  claim 1 , wherein the push lever of the actuator is rotatably connected with the movable rack, and the cylinder of the actuator is rotatably connected with the fixed rack. 
     
     
         4 . The electric bed frame as claimed in  claim 1 , wherein the supporting board has a hollow portion accommodating a part of the actuator. 
     
     
         5 . The electric bed frame as claimed in  claim 4 , wherein the movable rack has a connecting portion rotatably connected with one of the two ends of the actuator and partially located in the hollow portion of the supporting board. 
     
     
         6 . The electric bed frame as claimed in  claim 1 , wherein a bottom of the base plate is a plane. 
     
     
         7 . The electric bed frame as claimed in  claim 6 , wherein the base plate has at least one hollowed-out portion. 
     
     
         8 . An electric bed frame comprising:
 a fixed rack, comprising at least two first rods parallel with each other and at least three second rods unparalleled to the first rods, the first rods being connected with the second rods, and bottoms of the first and the second rods being substantially at an imaginary plane;   a movable rack rotatably connected with the fixed rack;   an actuator, two ends of which are rotatably connected with the fixed rack and the movable rack respectively, the actuator comprising a cylinder and a push lever extended from the cylinder and movable into and out of the cylinder, the movable rack being swung upwardly relative to the fixed rack when the push lever is moved out of the cylinder to make the actuator lengthened, the movable rack being swung downwardly relative to the fixed rack when the push lever is moved into the cylinder to make the actuator shortened; and   a supporting board disposed on a top side of the movable rack.   
     
     
         9 . The electric bed frame as claimed in  claim 8 , wherein the cylinder of the actuator is rotatably connected with the movable rack, and the push lever of the actuator is rotatably connected with the fixed rack. 
     
     
         10 . The electric bed frame as claimed in  claim 8 , wherein the push lever of the actuator is rotatably connected with the movable rack, and the cylinder of the actuator is rotatably connected with the fixed rack. 
     
     
         11 . The electric bed frame as claimed in  claim 8 , wherein the supporting board has a hollow portion accommodating a part of the actuator. 
     
     
         12 . The electric bed frame as claimed in  claim 11 , wherein the movable rack has a connecting portion rotatably connected with one of the two ends of the actuator and partially located in the hollow portion of the supporting board. 
     
     
         13 . The electric bed frame as claimed in  claim 8 , wherein the bottoms of the first and the second rods form a mesh surface. 
     
     
         14 . An electric bed frame comprising:
 a fixed rack, comprising a plurality of supporting rods parallel with each other and a plurality of connecting rods connected with the supporting rods, bottoms of the supporting rods being substantially at an imaginary plane;   a movable rack rotatably connected with the fixed rack;   an actuator, two ends of which are rotatably connected with the fixed rack and the movable rack respectively, the actuator comprising a cylinder and a push lever extended from the cylinder and movable into and out of the cylinder, the movable rack being swung upwardly relative to the fixed rack when the push lever is moved out of the cylinder to make the actuator lengthened, the movable rack being swung downwardly relative to the fixed rack when the push lever is moved into the cylinder to make the actuator shortened; and   a supporting board disposed on a top side of the movable rack.   
     
     
         15 . The electric bed frame as claimed in  claim 14 , wherein the cylinder of the actuator is rotatably connected with the movable rack, and the push lever of the actuator is rotatably connected with the fixed rack. 
     
     
         16 . The electric bed frame as claimed in  claim 14 , wherein the push lever of the actuator is rotatably connected with the movable rack, and the cylinder of the actuator is rotatably connected with the fixed rack. 
     
     
         17 . The electric bed frame as claimed in  claim 14 , wherein the supporting board has a hollow portion accommodating a part of the actuator. 
     
     
         18 . The electric bed frame as claimed in  claim 17 , wherein the movable rack has a connecting portion rotatably connected with one of the two ends of the actuator and partially located in the hollow portion of the supporting board.