Backrest assembly

Abstract

A bracket assembly includes a backrest, a support and a fastener. The backrest defines a hole with a wall formed with a thread. The support is attached to a seat and defines a slot. The fastener includes a bolt formed with a thread and a head secured to the bolt. The bolt is inserted through the slot and the thread formed on the bolt is engaged with the thread formed on the wall of the hole in order to sandwich the support between the backrest and the head so as retain the backrest in position on the support. The engagement the thread formed on the bolt with the thread formed on the wall of the hole can be loosened so as allow adjustment of the position of the backrest on the support. In another aspect, the backrest includes a first panel and a second panel. The first panel defines a hole with a wall on which a thread is formed and a second panel. The second panel defines a hole. The support is located between the first panel and the second panel. The bolt is inserted through the hole defined in the second panel and the slot. The thread formed on the bolt is engaged with the thread formed on the wall of the hole defined in the first panel in order to sandwich the support between the first panel and the second panel so as retain the backrest in position on the support.

1 . A backrest assembly including: 
 a backrest defining a hole with a wall formed with a thread;    a support defining a slot and being attached to a seat;    a fastener including a bolt formed with a thread and a head secured to the bolt, wherein the bolt is inserted through the slot and the thread formed on the bolt is engaged with the thread formed on the wall of the hole in order to sandwich the support between the backrest and the head so as retain the backrest in position on the support, and the engagement the thread formed on the bolt with the thread formed on the wall of the hole can be loosened so as allow adjustment of the position of the backrest on the support.    
     
     
         2 . The backrest assembly according to  claim 1  wherein the support is a tube.  
     
     
         3 . The backrest assembly according to  claim 1  wherein the support is a strip.  
     
     
         4 . The backrest assembly according to  claim 1  wherein the backrest includes two ridges formed thereon, and the support is located between the ridges so as to restrain rotation of the backrest on the support.  
     
     
         5 . The backrest assembly according to  claim 1  wherein the fastener includes a knob secured to the head in order to facilitate rotation of the bolt.  
     
     
         6 . A backrest assembly including: 
 a backrest including a first panel defining a hole with a wall formed with a thread and a second panel defining a hole;    a support including a first section attached to a seat and a second section defining a slot and being located between the first panel and the second panel;    a fastener including a bolt formed with a thread and a head secured to the bolt, wherein the bolt is inserted through the hole defined in the second panel and the slot, and the thread formed on the bolt is engaged with the thread formed on the wall of the hole defined in the first panel in order to sandwich the support between the first panel and the second panel so as retain the backrest in position on the support, and the engagement the thread formed on the bolt with the thread formed on the wall of the hole can be loosened so as allow adjustment of the position of the backrest on the support.    
     
     
         7 . The backrest assembly according to  claim 6  wherein the support is a tube.  
     
     
         8 . The backrest assembly according to  claim 6  wherein the support is a strip.  
     
     
         9 . The backrest assembly according to  claim 6  wherein the first panel includes two ridges formed thereon, and the support is located between the ridges so as to restrain rotation of the first panel on the support.  
     
     
         10 . The backrest assembly according to  claim 6  wherein one of the first and second panels includes a plurality of bosses and the remaining one of the first and second panels defines a corresponding number of recesses for receiving the bosses in order to align the first pane with the second panel.  
     
     
         11 . The backrest assembly according to  claim 6  wherein the fastener includes a knob secured to the head in order to facilitate rotation of the bolt.