Extendable shelf apparatus

Abstract

The present disclosure discloses an extendable shelf comprising: plastic upper covers, joinable net sheets, clamping pieces, bamboo-shaped pipes, threaded connectors, seamless cone sleeves, and adjusters etc. The extendable shelf may be configured to be extended along a left and right direction, and along an upward and downward direction. The present disclosure provides many advantages such as a simple and compact structure, good stability, high weight-bearing capability, convenience for disassembly and assembly, saving bamboo-shaped pipes, low cost, elegant appearance, and good structural integrity.

1 . An extendable shelf comprising:
 a plurality of plastic upper covers configured as T-shaped bolts;   a plurality of joinable net sheets;   a plurality of clamping pieces;   a plurality of bamboo-shaped pipes;   a plurality of threaded connecting rods, wherein the plurality of bamboo-shaped pipes are assembled in pairs through thread engagement of said plurality of threaded connecting rods to form a plurality of bamboo-shaped pipes;   a plurality of upper seamless cone sleeves; and   a plurality of lower seamless cone sleeves, wherein both ends of each bamboo-shaped pipe are provided with inner iron plugs by means of punching;   wherein the plurality of plastic upper covers, the plurality of joinable net sheets, the plurality of bamboo-shaped pipes, the plurality of clamping pieces, the plurality of threaded connecting rods, the plurality of upper seamless cone sleeves and lower seamless cone sleeves and plurality of adjusters configured as a plurality of foundation bolts, are assembled together in an extendable manner to form a whole shelf, which includes a plurality of layers, including a top layer, a middle layer and a bottom layer, and a plurality of rows, including a left row and a right row, of the joinable net sheets arranged on the plurality of bamboo-shaped pipes; and   wherein the plurality of adjusters are thread engaged to inner threads of iron inner plugs punched into the bottom ends of the plurality of bamboo-shaped pipes, and the plurality of plastic top covers are engaged to inner threads of iron plugs punched into the top ends of the plurality of bamboo-shaped pipes.   
   
   
       2 . The extendable shelf according to  claim 1 , wherein:
 each of the plurality of joinable net sheets is a rectangular net piece comprising top boundary lines and bottom boundary lines, configured to surround grid pieces and being welded thereto;   the plurality of upper seamless cone sleeves are respectively mounted on the plurality of top corners of one side of upper layer of the plurality of joinable net sheets, and the plurality of lower seamless cone sleeves are respectively mounted on the plurality of top corners of the other side of lower layer of the plurality of net sheets; and   one end of the top boundary line is punched and bent near the lower seamless cone sleeves to encompass the grid pieces at one side, then is welded to connect with the upper seamless cone sleeves at the other side; one end of the bottom boundary line is punched and bent near the upper seamless cone sleeves to encompass the grid pieces at one side, then is welded and connected with the lower seamless cone sleeves at the other side.   
   
   
       3 . The extendable shelf as recited in  claim 1 , wherein:
 each of the height of the plurality of upper seamless cone sleeves and the height of the plurality of lower seamless cone sleeves is half of that of cone sleeves of net sheets in the existing shelf.   
   
   
       4 . The extendable shelf as recited in  claim 1 , wherein:
 the clamping pieces are concave with protruding slices on one side, grooves on the other side, and tongues on the inner wall, which are narrow at the top but wide at the bottom; and   each two said clamping pieces are combined together so as to form a hollow truncated cone by inserting one into another, then fixedly placed on the joint of the plurality of bamboo-shaped pipes for connecting with the joinable net sheets.   
   
   
       5 . The extendable shelf as recited in  claim 1 , wherein:
 the plurality of bamboo-shaped pipes are pipe-shaped elements with slots uniformly placed on the surfaces thereof, the inner sides of the top end and bottom end of each said bamboo-shaped pipes being provided with iron inner plugs having inner threads by means of punching;   the plurality of bamboo-shaped pipes are connected and mounted to form the plurality of bamboo-shaped pipes via the threads on the plurality of connecting rods;   at least one of said clamping pieces combined by inserting one into another are engaged and fixed in the slots at the surface of the bamboo-shaped pipes through the tongues placed on the inner wall; and   the plurality of top seamless cone sleeves and the plurality of bottom seamless cone sleeves which are mounted at the top corners of the plurality of net pieces are respectively inserted to encompass the outer surfaces of the plurality of clamping pieces engaged with each other.   
   
   
       6 . An extendable shelf as recited  claim 1 , wherein:
 the threaded connecting rods are double-ended bolts which have outer threads on the two ends and openings at the middle.   
   
   
       7 . An extendable shelf as recited  claim 1 , wherein:
 the plurality of joinable net sheets, at four top corners of which are respectively mounted the plurality of top seamless cone sleeves and the plurality of bottom seamless cone sleeves, are respectively placed and fixed in sequence, from bottom to top and from left to right, at the plurality of layers, i.e. a bottom layer, a middle layer and a top layer, of the plurality of bamboo-shaped pipes, which are surrounded by a plurality of said clamping pieces combined together.