Retractable gymnastic backboard

Abstract

A retractable gymnastic backboard includes a first frame member having a positioning groove and a screw hole, a second frame member having a positioning groove, a bendable board member having two distal ends thereof respectively engaged into the positioning grooves of the first and second frame members, and an adjustment rod member having a middle handhold portion, a screw portion disposed at one end and threaded into the screw hole of the first frame member, and a coupling portion disposed at the other end and pivotally coupled to the second frame member for allowing rotation of the adjustment rod member to move the first frame member relative to the second frame member and to further adjust the height of the board member.

1 . A retractable gymnastic backboard comprising: 
 a first frame member having a positioning groove and a screw hole;    a second frame member having a positioning groove;    a bendable board member having two distal ends respectively engaged into the positioning groove of said first frame member and the positioning groove of said second frame member; and    an adjustment rod member having a handhold portion, a screw portion threaded into the screw hole of said first frame member, and a coupling portion pivotally coupled to said second frame member.    
   
   
       2 . The retractable gymnastic backboard as claimed in  claim 1 , wherein said second frame member has at least one guide hole; said first frame member has at least one coupling rod slidably inserted into the at least one guide hole of said second frame member.  
   
   
       3 . The retractable gymnastic backboard as claimed in  claim 1 , wherein said first frame member has at least one guide hole; said second frame member has at least one coupling rod slidably inserted into the at least one guide hole of said first frame member.  
   
   
       4 . The retractable gymnastic backboard as claimed in  claim 1 , wherein said handhold portion of said adjustment rod member has a non-circular cross section.  
   
   
       5 . The retractable gymnastic backboard as claimed in  claim 1 , wherein said board member has a through hole at a middle thereof.  
   
   
       6 . The retractable gymnastic backboard as claimed in  claim 1 , wherein said second frame member has a coupling hole, which receives the coupling portion of said adjustment rod member.  
   
   
       7 . The retractable gymnastic backboard as claimed in  claim 1 , wherein the coupling portion of said adjustment rod member has a coupling hole; said second frame member has a coupling portion pivotally coupled to the coupling hole of the adjustment rod member.