Quick adjustable supporting device

Abstract

A supporting device includes a base with a tube connected thereto and a rod having a threaded outer periphery is freely and movably received in the tube. A support platform is connected to the rod. A biasing device includes a box, a spring received in the box and a pushing member which is movably inserted through one end of the box and contacts the spring. The pushing member has a through hole with threads defined in an inner periphery of the through hole. The rod movably extends through two alignment holes of the box and the threads are engaged with the threaded outer periphery. The rod is quickly moved relative to the tube by pushing the pushing member to disengage the threads of the through hole from the rod.

What is claimed is:  
     
         1 . A supporting device comprising: 
 a base;    a tube connected to the base;    a rod having a threaded outer periphery and movably received in the tube, an inner diameter of a passage of the tube being larger than an outer diameter of the threaded outer periphery of the rod, a support platform connected to the rod, and    a biasing device composed of a box, a spring received in the box and a pushing member which is movably inserted through one end of the box and contacts the spring which is biased between the pushing member and an inside of the box, the pushing member having a through hole defined radially therethrough and threads defined in an inner periphery of the through hole, the rod movably extending through two alignment holes of the box and the threads engaged with the threaded outer periphery.    
     
     
         2 . The device as claimed in  claim 1 , wherein a connection member pivotably connected between the support platform and the rod.  
     
     
         3 . The device as claimed in  claim 2 , wherein the platform includes two lugs extending from an underside thereof and the connection member has an ear which is connected between the two lugs.  
     
     
         4 . The device as claimed in  claim 2 , wherein the connection member has a threaded hole and an end of the rod is threadedly engaged with the threaded hole.  
     
     
         5 . The device as claimed in  claim 1 , further comprising a neck extending from the box and an end of the tube being rotatably retained in the neck.  
     
     
         6 . The device as claimed in  claim 5 , wherein the end of the tube has a groove and the neck has a threaded hole defined therethrough, a bolt extending through the threaded hole and engaged with the groove.