text: the preferred embodiments of the present invention will be described in terms of tents with reference to fig1 - 13 , although the principles and concepts are equally applicable to other collapsible shade structures . the scope of the invention is best defined by the appended claims . as shown in fig1 and 3 , the basic structure for a tent 30 comprises four resilient frame members 34 , 38 , 42 and 46 . each of the frame members 34 , 38 , 42 and 46 has three sides connected by curved portions to form a triangular - shape . the frame members 34 , 38 , 42 and 46 are retained in position by fabric or sheet material 50 , which includes internal frame retaining sleeves 54 , 58 , 62 and 66 for retaining the frame members 34 , 38 , 42 and 46 , respectively . the internal frame retaining sleeves 54 , 58 , 62 and 66 may be provided by mechanically fastening ( stitching ), fusing , or gluing so that the frame members 34 , 38 , 42 , and 46 are retained in position . the fabric 50 in conjunction with the frame members 34 , 38 , 42 , and 46 form four triangular side panels 70 , 74 , 78 , and 82 , respectively , so that each frame member is used to support one side panel . each side panel and its associated frame member is vertically inclined inwardly at an angle to create a domed structure in which the interior area of the structure gradually decreases from the bottom to the top although the frame members 34 , 38 , 42 , and 46 are described as formed of flexible steel , other materials such as plastics may be used . the frame members should be made of a material which is relatively strong and yet is flexible to a sufficient degree to allow it to be coiled . the term fabric is to be given its broadest meaning and should be made from strong , lightweight materials and may include woven fabrics , sheet fabrics or even films . the fabric should be waterproof and capable of withstanding the harsh outdoor environment to be suitable for use as an outdoor tent during camping . the fabric and frame members are preferably made of lightweight material to facilitate ease of transportation of the tent . the tent 30 is further provided with a roof 86 which is made of the same material as fabric 50 . the roof 86 is located between the upper curved portions of the side panels 70 , 74 , 78 and 82 and takes the form of an interconnecting fabric . a floor portion 84 which may be made from the same material as the fabric 50 is provided to interconnect the lower edges of the side panels 70 , 74 , 78 and 82 . ties 88 are provided at the corners of the side panels 70 , 74 , 78 and 82 for securing the tent 30 to the ground . the area of the floor 84 is larger than the area of the roof 86 due to the vertically inclined side panels forming the domed structure . the tent 30 is also provided with a door 90 , preferably located in a side panel , for example , side panel 70 , for ingress and egress . the door 90 is essentially a triangular - shaped cutout in the side panel 70 having a portion which is made of a fly - screen 94 . the door 90 has two zipper edges 98 and 102 and a hinged edge 106 . mating zipper halves are provided along each side of the edges 98 and 102 of the door 90 and the corresponding edges of the side panel 70 to releasably hold the door 90 in a sealed position when the tent 30 is being occupied and the zippers pulled up . ventilation of the tent 30 is achieved through the fly - screen 94 and through vents 110 and 114 disposed at the upper curved portion of side panels 74 and 82 , respectively . vents 110 and 114 have the same construction . for example , referring to fig1 , 4 , and 5 , the vent 110 has a waterproof hood 118 which is sewn along the upper curved edges of the side panel 74 . the hood 118 extends outwardly from the side panel 74 in an open position . the outer periphery 120 of the hood 118 is formed by a small steel loop 122 enclosed within the outer periphery 120 which defines the semi - circular shape of the outer periphery 120 . a hinged hook 126 is provided at a central portion of the outer periphery 120 . a strip 130 having one end sewn to a central portion of the bottom of side panel 74 has an opposite end which may be hooked by the hinged hook 126 to keep the hood open the upper portion of side panel 74 is made up of a mesh portion 132 . the upper curved portion of the frame member 38 and an elongated steel strip 138 together define the semi - circular shape of the mesh portion 132 . the outer periphery 120 of the hood 118 and the steel strip 138 define a semi - circular shape for fitting another screen mesh 134 therebetween . the vent 110 may be held in the open position shown in fig1 , and 5 by hooking the strip 130 to the hook 126 . the hood 118 is retracted when the tent 30 is to be collapsed and stored . when the hood 118 is to be retracted , the strip 130 is unhooked from the hook 126 , and the hood 118 is pulled upwardly so that the hinged hook 126 may be made to hook an elastic loop 142 so that the screen mesh 134 is held firmly against the mesh portion 132 of the side panel 74 . regardless of whether the hood 118 is tied in the open or in the closed position , the mesh portion 132 and the screen mesh 134 provide ventilation to the inside compartment of the tent 30 , as well as shielding the interior of the tent 30 from bugs and insects . fig6 illustrates an additional modification that may be made to the tent 30 of the present invention . for example , rods 146 and 150 are provided in a manner perpendicular to each other to provide further support to the upper portion of the tent and , in particular , the roof 86 . openings 154 are provided at an upper central portion of each side panel for receiving the ends of the rods 146 and 150 . a retaining member 158 is fixed at the central point of the roof 86 and holds the rods 146 and 150 perpendicular to each other in such a manner that each end of the rod 146 or 150 is fitted through a guide 162 and its corresponding opening 154 . this provides more stability to the roof 86 of the tent 30 . fig7 illustrates a second embodiment 200 of the tent of the present invention wherein the tent 200 is provided with six inclined triangular side panels as opposed to the four triangular side panels shown in the embodiment of fig1 . as with the embodiment of fig1 each side panel 204 is provided with a separate frame member 208 to provide the necessary stable support . fig8 illustrates a third embodiment 230 of the tent of the present invention wherein five inclined triangular side panels 234 supported by five frame members 238 are provided . fig9 illustrates a fourth embodiment 250 of the tent of the present invention wherein four rectangular side panels 254 are provided but are arranged to stand vertically as opposed to being inclined at an angle so as to form a rectangular internal block or space . the roof in the embodiment of fig9 may be formed by two triangular - shaped frame members 258 which ma be folded one upon the other when the tent is folded up . fig1 illustrates a fifth embodiment 280 of the tent of the present invention wherein two opposing walls 284 may be lengthened by providing three inclined side panels 288 to comprise each wall 284 , each side panel 288 supported by a separate frame member 292 . it can be seen , therefore , that the tent of the present invention may take a variety of external shapes . these external shapes are facilitated by the provision of additional frame members configured to form the desired shape . each side of the tent , regardless of the shape , is supported by at least one frame member . the tent may be of any size but is commonly of such a size as to accommodate one or more persons . fig1 ( a ) through 11 ( f ) describe the various steps for folding the tent 30 of the embodiment of fig1 - 5 for storage . in fig1 ( a ), the first step consists of pushing in side panels 70 and 74 such that side panel 70 collapses upon side panel 82 and side panel 74 collapses upon side panel 78 . then , in the second step shown in fig1 ( b ), the two side panels 70 and 82 are folded so as to be collapsed upon the two side panels 74 and 78 . the structure is twisted and folded to collapse the frame members and side panels into a smaller shape . in the third step shown in fig1 ( c ) and 11 ( d ), the opposite border 320 of the structure is folded in upon the previous fold to further collapse the frame members with the side panels . as shown in fig1 ( e ), the fourth step is to continue the collapsing so that the initial size of the structure is reduced . fig1 ( f ) shows the fifth step with the frame members and side panels collapsed on each other to provide for a small essentially compact configuration having a plurality of concentric frame members and layers of the side panels so that the collapsed structure has a size which is a fraction of the size of the initial structure . therefore , the present invention provides a collapsible shade structure in which each side panel is supported by at least one frame member to provide stable support for the entire structure . the collapsible shade structure may be easily collapsed by folding and twisting the frame members and the side panels to cause the frame members to collapse within themselves to form smaller concentric frame members and layers of side panels to create a compact folded configuration which may be stored and transported very easily . referring to fig1 , the collapsible shade structure of the present invention may take the form of a cabana 170 . the cabana 170 is comprised of three side panels 174 , 178 and 182 , each supported by a frame member , 176 , 180 and 184 , respectively . the cabana 170 also has a mesh door 186 which is also supported by a frame member 188 . the mesh door 186 is sewn to the roof 190 along a hinged edge 194 so that the mesh door may be flipped up or down about the hinged edge 194 . the mesh door 186 may be flipped to an open position such as that shown in fig1 and held in place atop the roof 190 by means of &# 34 ; velcro &# 34 ; pads 198 . as shown in fig1 , the four corners of the cabana may be provided with pockets 202 which are used to collect sand . each pocket 202 is provided with a flap 206 , which is normally secured to the pocket 202 by means of &# 34 ; velcro &# 34 ; pads , but the flap 206 may be opened to allow the sand collected therein to be emptied . while the description above refers to particular embodiments of the present invention , it will be understood that many modifications may be made without departing from the spirit thereof . the accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention . the presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive , the scope of the invention being indicated by the appended claims , rather than the foregoing description , and all changes which come within the meaning and range of equivalency of the claims ar therefore intended to be embraced therein .