Hidden-Fastener fence

Abstract

A hidden-fastener fence is disclosed, which features wavelike seizing surfaces on the opposite inner walls of horizontal tubes of the fence. And wavelike embedding verges are set up at both sides of horizontal plate of a fixing bar to fit in the seizing surfaces of the horizontal tube. Accordingly, the joining of the embedding verges at the both sides of the horizontal plate of the fixing bar and the seizing surfaces of the corresponding inner walls of the horizontal tube would prop the bottom opening of the horizontal tube outward, which considerably boosts the structural strength of the bottom opening of the horizontal tube, and the wavelike seizing surfaces on the inner walls of the horizontal tube further fortifies the rigidity of the horizontal tube.

1 . A hidden-fastener fence, made up of a plurality of horizontal tubes and vertical tubes, where both are vertically intersecting to each other, and an axial fixing bar being provided in each horizontal tube, which is used to join fixedly with a vertical tube by a fastener, wherein,
 a.) a horizontal tube, having an opening at its bottom, and a hole at the location corresponding to each vertical tube, where the hole is used for the penetration of the horizontal tube by the vertical tube;   b.) a fixing bar, having a horizontal plate and a vertical plate, where the horizontal plate is provided with a bore, corresponding to the location of each vertical tube, for the penetration by the vertical tube through it; and a through hole, corresponding to the tube wall of each vertical tube, at the vertical plate, for the penetration by a fastener to join fixedly with tube wall of the vertical tube through it, which enables the fixing bar to intersect each vertical tube in a firm joining, the improvement comprising:   wavelike seizing surfaces being set up on the opposite inner walls of the horizontal tube, and wavelike embedding verges being set up at both outer sides of the horizontal plate of the fixing bar to fit in the seizing surfaces of the horizontal tube.   
     
     
         2 . A hidden-fastener fence as in  claim 1  wherein the fixing bar is L-shaped. 
     
     
         3 . A hidden-fastener fence as in  claim 1  wherein the thickness of the vertical plate at the top of the embedding verge of the horizontal plate of the fixing bar is diminished, and the diminished width being just same to the thickness of the nut of the fastener.