Bedstead with adjustable height

Abstract

A bedstead with adjustable height has a base, a passive frame and a connecting frame. The base connects with the passive frame through the lifting element, so that the height of the passive frame can be adjusted through the lifting element. Also, the passive frame moves linearly through the restriction rod along the rail rod to increase the preciseness and stableness of the movement of the lifting element. The connecting frame is disposed between the base and the passive frame, wherein the connecting frame has two corresponding connecting rods and driving rods to form a supporting frame, so the passive frame and the base are balanced with each other through the connecting frame to increase the strength between the passive frame and the base and evenly distribute the pressure on the surface of the passive frame to prevent unsmooth adjustment of the passive frame due to single-sided pressure.

What is claimed is: 
     
         1 . A bedstead with adjustable height comprising:
 a base having a plurality of supporting rod extending upwards is disposed at periphery thereof, outer portion of each supporting rod having a rail rod, and a lifting element located at center of the base;   a passive frame, periphery thereof is slightly larger than the base, a frame rod having a restriction rod corresponding to the rail rod of the base, and a mattress disposed on top of the passive frame; and   a connecting frame having two corresponding connecting rods, each of which having a second connecting rod at its end to form an H-shaped rod body, wherein one end of the second connecting rod connects with the periphery of the passive frame, and the other end pivotally connects with the base with a conjugating rod, so that two connecting rods of the connecting frame are disposed and connected between the base and the passive frame, wherein a driving rod is disposed between two connecting rods, and said two connecting rods of the passive frame are driven simultaneously through the driving rod.   
     
     
         2 . The bedstead with adjustable height of  claim 1 , wherein said two connecting rods have at least two pivotal connecting portions to pivotally connect with second connecting rods.