Base of sunshade umbrella

Abstract

The present utility model is a large-sized sunshade umbrella which is used at fixed site outdoor. The interior of the base is divided into several independent portions, a protection case which is mated with the base is brought to cover the base, and the devices of caster wheel which can be stretched-out and drawn-back are provided in the holes at the corners of the base. Sand or water as the counterweight in the base can be added or reduced freely. When the base needs to fix, the caster wheels are drawn-back into the base through manual regulation to make the base rest on the ground to increase the attaching force; when the umbrella needs to move, the four caster wheels are stretched-out from the base to contact with the ground, so that a man or woman can push the umbrella smoothly to the site where he or she intends to place it.

1 . A base of sunshade umbrella, characterized in that the interior of the base is divided into several independent portions, a protection case which is mated with the base is brought to cover over the base, and devices of caster wheel which can be stretched-out and drawn-back are provided in the holes at the corners of the base.  
   
   
       2 . The base of sunshade umbrella according to  claim 1 , characterized in that said device of caster wheel which can be stretched-out and drawn-back comprises a lead screw, a holder of lead screw and a caster wheel, the caster wheel is fixed to the lead screw, the lead screw is thread-engaged with its holder, and the holder of lead screw is fixed to the base.  
   
   
       3 . The base of sunshade umbrella according to  claim 2 , characterized in that said caster wheel comprises a fixing frame, a retainer ring, a plurality of steel balls, a riveted member, a positioning plate and a wheel, based on the fixing frame, the upper steel balls are provided in the annular groove on the fixing frame, and the lead screw is inserted into the center hole of the fixing frame; the lower steel balls are supported by the positioning plate, and the wheel is rotatably fixed in the notch of the fixing frame with the riveted member as a shaft which is retained with the retaining ring at its tail.  
   
   
       4 . The base of sunshade umbrella according to  claim 1 , characterized in that the link rod is linked to the upper end of the lead screw, and the rotating handle is connected to the link rod.  
   
   
       5 . The base of sunshade umbrella according to  claim 2 , characterized in that the link rod is linked to the upper end of the lead screw, and the rotating handle is connected to the link rod.  
   
   
       6 . The base of sunshade umbrella according to  claim 1 , characterized in that the holes for lead screw on the protection case are covered with caps.  
   
   
       7 . The base of sunshade umbrella according to  claim 2 , characterized in that the holes for lead screw on the protection case are covered with caps.