Rack assembly

Abstract

A rack assembly has two side racks, two rails, and at least one sub-rack. The rails are mounted between the side racks and include a front rail and a rear rail parallel with each other. Each rail has an opening in a bottom of the rail. The at least one sub-rack is slidable along the rails and each sub-rack has a rack frame, a connection rod, and at least one supporting member. The rack frame has at least one front rod and at least one rear rod. Each front rod has an extension rod mounted retractably on a top of the front rod and having a front wheel.

1 . A rack assembly comprising:
 two side racks spaced from each other;   two rails mounted between and connected with the side racks, being parallel with each other, located at a same height, and including a front rail and a rear rail, and each rail having a U-section to form an opening in a bottom of the rail, wherein
 each rail comprises a bottom panel, an outer panel, and an inner panel; 
 the outer panel and the inner panel are respectively formed on and extend downwardly from two sides of the bottom panel; 
 the inner panels of the two rails face each other; and 
 the inner panel has a downward extension length larger than a downward extension length of the outer panel; and 
   at least one sub-rack disposed between the side racks, being slidable along the rails, and each one of the at least one sub-rack comprising
 a rack frame composed of multiple longitudinal rods, which include at least one front rod and at least one rear rod corresponding in position respectively to the front rail and the rear rail, wherein each one of the at least one front rod has
 an extension rod mounted retractably on a top of the front rod and having a front wheel mounted rotatably on a top of the extension rod; and 
 a spring mounted in the front rod and abutting a bottom of the extension rod to push the extension rod upward and to hold the front wheel on the extension rod in the front rail; 
 
 a connection rod connected to the extension rod of each one of the at least one front rod; and 
 at least one supporting member mounted on the rack frame. 
   
     
     
         2 . The rack assembly as claimed in  claim 1 , wherein each side rack comprises a rack frame composed of multiple longitudinal rods and at least one supporting member mounted securely on the rack frame of the side rack. 
     
     
         3 . The rack assembly as claimed in  claim 2 , wherein each one of the at least one sub-rack further comprises a pulling rod mounted on the connection rod of the sub-rack. 
     
     
         4 . The rack assembly as claimed in  claim 3 , wherein each longitudinal rod of each one of the at least one sub-rack has a bottom and a rotating wheel mounted on the bottom of the longitudinal rod of the sub-rack. 
     
     
         5 . The rack assembly as claimed in  claim 1 , wherein each one of the at least one sub-rack further comprises a pulling rod mounted on the each connection rod of the each sub-rack. 
     
     
         6 . The rack assembly as claimed in  claim 5 , wherein each longitudinal rod of each one of the at least one sub-rack has a bottom and a rotating wheel mounted on the bottom of the longitudinal rod of the sub-rack. 
     
     
         7 . The rack assembly as claimed in  claim 2 , wherein each longitudinal rod of each one of the at least one sub-rack has a bottom and a rotating wheel mounted on the bottom of the longitudinal rod of the sub-rack. 
     
     
         8 . The rack assembly as claimed in  claim 1 , wherein each longitudinal rod of each one of the at least one sub-rack has a bottom and a rotating wheel mounted on the bottom of the longitudinal rod of the sub-rack.