Height adjustment structure for a canopy

Abstract

A canopy has a framework including a plurality of vertical poles and a roof frame. A height adjustment structure for adjusting the height of the roof frame includes a sliding sleeve disposed around each vertical pole, to which the roof frame is connected. The sleeve can slide along the pole so that a through hole on a sidewall of the sleeve is aligned with one of the holes provided on the vertical pole. A spring loaded press plate pivotally mounted on the sidewall of the sleeve has a locking pin at one end which can extend into the through hole on the sleeve and the hole on the pole to lock the sleeve at a desired height along the pole.

1 . A height adjustment structure for a canopy, comprising: 
 a vertical pole having a plurality of holes defined thereon;    a sliding sleeve disposed around the vertical pole and having connecting parts formed thereon, the sliding sleeve having a through hole defined on a sidewall thereof; and    a spring loaded press plate pivotally mounted on the sidewall of the sleeve and having a locking pin at one end,    wherein the sliding sleeve is slideable along the vertical pole to align the through hole with one of the holes on the vertical pole, and wherein the locking pin of the press plate is capable of extending through the through hole of the sleeve and a hole on the vertical pole aligned with the through hole, thereby locking the sleeve at a desired height.    
   
   
       2 . The structure of  claim 1 , wherein the sliding sleeve includes two protruding plates each having a hole, wherein the spring loaded press plate includes: 
 a mounting pin extending through the two holes on the two plates, the press plate pivoting around the mounting pin; and    a spring wound around the mounting pin to urge the locking pin into the through hole of the sleeve.    
   
   
       3 . A framework of a canopy, comprising: 
 a plurality of vertical poles each having a plurality of holes defined thereon; and    a roof frame connected to the vertical poles;    wherein each vertical pole includes a height adjustment structure including: 
 a sliding sleeve disposed around the vertical pole and having connecting parts formed thereon for connecting to the roof frame, the sliding sleeve having a through hole defined on a sidewall thereof; and  
 a spring loaded press plate pivotally mounted on the sidewall of the sleeve and having a locking pin at one end,  
 wherein the sliding sleeve is slideable along the vertical pole to align the through hole with one of the holes on the vertical pole, and wherein the locking pin of the press plate is capable of extending through the through hole of the sleeve and a hole on the vertical pole aligned with the through hole, thereby locking the sleeve at a desired height.  
   
   
   
       4 . The framework for a canopy of  claim 3 , wherein the sliding sleeve includes two protruding plates each having a hole, wherein the spring loaded press plate includes: 
 a mounting pin extending through the two holes on the two plates, the press plate pivoting around the mounting pin; and    a spring wound around the mounting pin to urge the locking pin into the through hole of the sleeve.