fig1 is a perspective view of an embodiment of a knockdown umbrella stand with retractile umbrella cover according to the present invention . fig2 is a prespective and fragmental view of an umbrella stand according to the present invention . fig3 is a perspective view of a box body according to the present invention . the present invention is composed of a box body ( 1 ), two holder elements ( 2 ), a plurality of supporting stands ( 3 ), a plurality of cross fasteners ( 4 ), and a plurality of connectors ( 5 and 6 ). the box body ( 1 ) is composed of an upper and a lower box elements ( 11 and 12 ) of identical structure . each of the box elements ( 11 and 12 ), with appropriate holder element ( 2 ) and cross fasteners ( 4 ), can form an independent stand , and assembly of two independent stands by means of the connectors ( 5 and 6 ) can form an umbrella stand according to the present invention . structure of the present invention is described with reference to only a stand as shown in fig2 . inner side of a box element ( 11 ) is partitioned to a plurality of spaces ( 113 , 114 , 115 ) of different sizes by means of a plurality of intersecting partitioning boards ( 111 and 112 ). among them the largest spaces ( 113 ) are installed with retainers ( 116 ) for retaining umbrella covers ( 7 ). the second largest spaces ( 114 ) and the small spaces ( 115 ) are designed for containing the supporting stands ( 3 ), cross fasteners ( 4 ) and connectors ( 5 and 6 ) during closing of the box body ( 1 ). the longitudinal partitioning boards ( 111 ) at both sides of the upper box element ( 11 ) have tenons ( 117 ) and mortises ( 118 ) along their external sides . of the lateral side of the upper box element ( 11 ) has a male fastener ( 119 ) and the other has a female fastener ( 120 ). the upper and lower box elements ( 11 and 12 ) can be fixed together by menas of connection of the tenon ( 117 ) to the mortise ( 128 ), the tenon ( 127 ) to the mortise ( 118 ), the male fastener ( 119 ) to the female fastener ( 130 ), and the male fastener ( 129 ) to the female fastener ( 120 ). a side of the upper box element ( 11 ) has a handle ( 13 ) with an opening ( 131 ) for retaining by a retainer ( 132 ) above it . the holder element ( 2 ) is a structure with a plurality of umbrella cover retaining rings ( 21 ) each with two stubs ( 211 ). each of the retaining rings ( 21 ) can hold an umbrella cover ( 7 ) for placing of an umbrella . the holder element ( 2 ) has a lateral bar ( 23 ) along a side . the stubs ( 211 ) can be used to hang folded umbrellas directly . there are some mortises ( 22 ) in the holder element ( 2 ) for fixing of supporting stands ( 3 ). each supporting stand ( 3 ) is composed of an upper core barrel ( 31 ), a lower barrel ( 32 ) and a plurality of intermediate core barrels ( 33 ). each of the upper , lower and intermediate core barrels ( 31 , 32 and 33 ) has a joint flange ( 311 , 321 or 331 ) for connecting to another core barrel . key ways ( 312 , 322 ) are made on the joint flange ( 311 ) on the upper barrel ( 31 ) and the bottom of the lower barrel ( 32 ) for incorporating the supporting stand ( 3 ) and mortise ( 22 ) of the holder element ( 2 ) to the upper box element ( 11 ). the connectors ( 5 ) are for jointing the upper and lower box elements ( 11 and 12 ) with their recess holes ( 51 ). the connectors ( 6 ) are for jointing two holders ( 2 ) by placing across two lateral bars ( 23 ). the cross fasteners ( 4 ) are for fixing the holder elements ( 2 ) by incorporating with the key ways ( 312 ) after the joint flange ( 311 ) of the supporting stand ( 3 ) has passed through the holder element ( 2 ). while the present invention is used as a stand , the handles ( 13 and 14 ) on the upper and lower box elements ( 11 and 12 ) have their respective openings ( 131 and 141 ) retained by the retainers ( 132 and 142 ). the handles ( 13 and 14 ) are used to ease handling after the upper and lower box elements ( 11 and 12 ) are assembled to form a box body ( 1 ). fig4 is a perspective and sectional view of an umbrella cover in extension condition according to the present invention . fig5 is a perspective view of the umbrella cover in retracted condition according to the present invention . the umbrella cover ( 7 ) according to the present invention mainly comprises of a plurality of hollow circular pipes ( 71 , 72 , 73 , 74 , 75 and 76 ) of different diameters . the pipe ( 71 ) which has the largest diameter is incorporated with an inner ring ( 711 ) at the bottom , and the pipe ( 76 ) which has the smallest diameter is incorporated with an outer ring ( 761 ) on the top . each of the intermediate pipes ( 72 , 73 , 74 and 75 ) has an inner ring ( 721 , 731 , 741 or 751 ) at the bottom and an outer ring ( 722 , 732 , 742 or 752 ) on the top . by interconnection of adjacent inner and outer rings , two adjacent pipes are moveably connected together in a manner that no pipe may disengage from its larger and adjacent pipe . in order to prevent falling of the smaller pipe into larger pipe which may make extension of the smaller pipe difficult , flanges ( 723 , 733 , 743 and 753 ) are designed at the bottoms of the pipes ( 72 , 73 , 74 and 75 ) respectively in a manner that such flanges will stop on the bottom of their respective larger and adjacent pipes . for instance , the flange ( 723 ) of the second largest pipe ( 72 ) will lay on the bottom of the largest pipe ( 71 ) while it is retracting into the largest pipe ( 71 ), and this design will prevent falling of the second largest pipe ( 72 ) into the largest pipe ( 71 ) which makes extension difficult . connection between other pipes will not be described here because it is identical to that between the pipes ( 71 ) and ( 72 ). in order to make the umbrella cover ( 7 ) water - tight , each of the pipes ( 72 , 73 , 74 and 75 ), except the largest pipe ( 71 ), has a lead - proof gasket ( 724 , 734 , 744 , 754 and 764 ) below their respective outer rings ( 722 , 732 , 742 , 752 and 762 ) in a manner that each leak - proof gasket is located between the inner wall of a pipe and outer wall of its smaller pipe , such as between the inner wall of the largest pipe ( 72 ) to provide good water tightness effect and to prevent leakage of water from seam of the cover when umbrella is kept in it . the largest pipe ( 71 ) according to the present invention has a hanging bracket ( 77 ) at the upper end . an end of the hanging bracket ( 77 ) is made in the form of a raised race ( 771 ). a nose ( 712 ) is formed on the surface of the largest pipe ( 71 ) at a position corresponding to the hanging bracket ( 77 ). the nose ( 712 ) and the raised face ( 771 ) divide the hanging bracket into two control spaces . when the control space is applied to fix the hanging bracket ( 77 ) to a retaining ring ( 21 ), position of the largest pipe ( 71 ) is adjustable by placing the retaining ring ( 21 ) between the nose ( 712 ) and the raised face ( 771 ), or between the nose and a retaining hole ( 772 ) of the hanging bracket ( 77 ) and thus the weight of the umbrella cover ( 7 ) become adjustable . the retaining hole ( 772 ) is for holding a cover plate ( 78 ) of the umbrella cover ( 7 ). the smallest pipe ( 76 ) has inner thread at its upper end and a closed lower end so that the umbrella cover ( 7 ) is a hollow structure with a closed end to keep water content when wet umbrella is kept in it and thus no water will leak to contaminate ground or floor on which it is placed . outer thread ( 763 ) is made on the bottom of the smallest pipe ( 76 ) to fit the inner thread ( 81 ) on a cover plate ( 8 ) for screwing the cover plate ( 8 ) to the smallest pipe ( 76 ) so that after retracting the umbrella cover the cover plate ( 8 ) can cover the other pipes ( 72 , 73 , 74 , 75 and 76 ) in the largest pipe ( 71 ). fig6 is a perspective and exploded partial view illustrating keeping of knockdown components in the box body according to the present invention . for knocking down the stand according to the present invention , the cross connectors ( 4 ), connectors ( 5 and 6 ), holder elements ( 2 ) and supporting stands are separated from each other , the umbrella covers ( 7 ) are retracted and fixed in the box element ( 11 ). then , barrel elements of the supporting stands ( 3 ), cross fasteners ( 4 ), connectors ( 5 and 6 ) are placed within the second largest spaces ( 114 ) and the small spaces ( 115 ), the holder elements ( 2 ) are placed on the partitioning boards ( 111 ) and ( 112 ), the other box element ( 12 ) is fixed to the box element ( 11 ) by connecting the connecting the mortise ( 128 ) and tenon ( 127 ) to the tenon ( 117 ) and mortise ( 118 ), and finally the male fasteners ( 119 and 129 ) are secured to the female fasteners ( 120 and 130 ) to secure the box elements ( 11 and 12 ) to form a box ( 1 ) which is portable by holding the handles ( 13 and 14 ).
a structure of retractile umbrella cover and knockdown umbrella stand comprising a box body composed of an upper and a lower box elements , two holder elements , a plurality of supporting stands , cross fasteners and umbrella covers . each box element upon incorporation with a holder element , some supporting stands and cross fasteners can form an umbrella stand unit , and a plurality of such units can be used in combination by means of connection with connectors for placing of umbrellas in umbrella covers , on hanging of them on stubs on the holder elements . bottom of the umbrella cover is used to keep water dropped from umbrella . the present invention can be knocked down and have its components kept in the box body which is small in volume and easy in storage as well as carriage since the box is designed with handle for such purpose .