[ 0040 ] fig1 shows the self - drilling screw with expandable anchor 10 unassembled . in a first embodiment the self - drilling screw having an expandable anchor 10 has three component parts . a hex head screw threaded component 20 similar to a sammy super screw ® sold by speedy products , inc . owned by illinois tool works , inc . 3600 west lake avenue , glenview , ill . 60025 - 5811 , a mushrooming component 30 similar to avk industrial products a - r series ™ threaded insert , sold by avk industrial products of valencia , calif . and a drill point 40 . fig1 also shows tools used to install the mushrooming expandable anchor 10 . the tools include a socket 50 for turning the hex head screw 20 , a sleeve tool 70 for engaging the expandable anchor 30 , an internally broached drive shaft 80 for engaging the socket 50 , a drive tool / adaptor 83 having a hex adaptor portion 82 to turn the above described assembly and adapt to drill bit 81 , if a drill point 40 is not included in the assembly , and finally drill 84 . in a first embodiment , as shown in fig1 the drill point 40 has a slightly larger diameter than the mushrooming component 30 such that it can cut a hole in a support 60 and allow the mushrooming portion 35 of the expandable anchor body 30 to fit though the drilled hole . the mushrooming component 30 is basically a cylinder having an internal threaded portion 34 near the top and a base 38 at the bottom . slots 36 are cut thought the cylinder walls in several locations around the mushrooming component 30 so that it can be compressed and split apart along the slits to form anchoring strips 37 when the mushrooming component 30 is collapsed as shown in fig3 and 7 . the mushrooming component 30 is formed with a bulge 35 in the walls to facilitate the collapse of anchoring strips 37 . although mushrooming component 30 is shown as a cylindrical body 35 with a circular cross section in the figures it can be any shape with any cross section such as an octagon , hexagon , square , or oval etc . as long as it will fit through the hole drilled in the support and collapse as shown herein . the hex head component 20 has a hex head portion 22 , a base portion 24 and a screw shaft 26 having a diameter just smaller than the inside threaded diameter 34 of the mushrooming component 30 . the shaft 26 has a threaded section 28 on the top portion for engaging the threads 34 in the mushrooming component 30 . in one mode of use , as seen in fig2 and 3 , the inside threads 34 in mushrooming component 30 are threaded onto the threads 28 on the screw shaft 26 of hex head screw 20 by a few turns . the hex head screw 20 is placed in a socket 50 having a hexagon wall 58 on a portion of the inside surface for mating with the hex head portion 22 of hex head screw 20 . the hex head screw 20 can then be turned by the socket 50 . as best seen in fig1 a sleeve tool 70 has an inside diameter which fits over the outside diameter of the socket 50 such that the socket 50 can rotate inside the sleeve tool 70 when desired . the sleeve tool 70 has notches 72 for engaging the corners 74 of the base 38 of the mushrooming component 30 . sleeve tool 70 can either be a hand held tool on the order of 12 to 15 inches long or an expandable pole tool that can be extended to any length . the sleeve tool 70 may have a hand gripping means to hold it in place while the socket 50 is being turned therein . the socket 50 has a hex shaft 52 for connection to internally broached drive shaft 80 which allows connection to machined part 83 having a hex adapter portion 82 , as seen in fig1 . a driving means 84 such as an electric or battery operated drill , air powered drill or the like can rotating the assembly . the driving means 84 is connected to the drive shaft 80 to drive socket 50 by part 83 , which optionally holds disposable drill bit 81 . as seen in fig2 the driving means 84 will turn drill point 40 on the top of mushrooming component 30 to cut through a support 60 , which may be a thin metal decking , beams , supports , z purlin , bar joist , roof decking , or other truss materials . after the drill point 40 has cut through the support 60 the drill point 40 is no longer needed . the next step in the process is to collapse or mushroom the mushrooming component 30 , as seen in fig3 to secure it from being pulled out of the support 60 . the driving means 84 will now rotate the combination of socket 50 and drive shaft 80 while the installer is holding the sleeve tool 70 in a fixed position such that the hex head screw 20 can rotate relative to the mushrooming component 30 thus rotating the treads 28 of the screw . as best seen in fig1 the threads 28 are only on a portion of the top of the screw shaft 26 . the internal threaded portion 34 of the mushrooming component 30 is also only on a top portion of the mushrooming component 30 . the relative length of the threaded portions 28 and 34 on the screw shaft 26 and the mushrooming component 30 respectively are such that as the hex head screw 20 is turned relative to the mushrooming component 30 the top of the mushrooming component 30 will be pulled downward allowing the bowed portion 35 having the slots 36 to collapse , forming anchoring strips 37 as seen in fig3 and 7 . base 38 will be pulled up against the bottom of support 60 and will not fit through the drilled hole therein . as the hex head screw 20 is turned relative to the mushrooming component 30 the anchoring strips 37 will be flattened out . the anchoring strips 37 will not fit through the hole self - drilled by drill point 40 offering a pull out strength strong enough to support whatever the hanger is to be attached to . as shown in fig2 , 4 , 7 and 9 the internal hanger threads 25 in the bottom portion of the hex head screw 20 are available to hold whatever is screwed into the hanger threads 25 or alternatively a cross drilled hole 46 may be incorporated to allow attachment of a great variety of adaptors . the pull out strength can vary depending on the support material 60 . as can be seen in fig3 the drill point 40 is expelled from the top of the mushrooming component 30 by the top of the screw shaft 26 as it pushes through the top of the expandable anchor 30 . the drill point 40 will then fall out and may land on the support 60 . the lengths of the threaded portions 28 and 34 on the screw shaft 26 and the mushrooming component 30 respectively are such that the threads 28 on the screw shaft 26 will exit the top threads 34 on the mushrooming component 30 allowing the hex head screw 20 to spin freely thereafter when the expandable anchor 10 is compressed to the desired amount . this spin free feature eliminates possible over torque or fracture of components incorporated in fastener 10 . it should be noted that the drill point 40 can be connected to the mushrooming component 30 in many different ways . in fig6 the drill point 40 is swaged into the mushrooming component 30 . in fig5 the drill point 40 has teeth 130 for engaging the mushrooming component 30 . in fig3 the drill point 40 has teeth notches 44 for engaging posts 45 the mushrooming component 30 . when self - drilling a hole in the support 60 the socket 50 turns the hex head screw 20 while notches 72 in sleeve 70 engage the corners 74 of the base 38 on the mushrooming component 30 . when the socket 50 turns the screw 20 the mushrooming component 30 and sleeve 70 will spin with the screw 20 since it takes a great deal of force to turn the threads 28 on screw 20 into the treads 34 of mushrooming component 30 . therefore the drilling can be accomplished without collapsing the mushrooming component 30 . however when the sleeve 70 is held to keep it from rotating then the mushrooming component 30 will collapse . alternatively the sleeve 70 will not be placed into engagement with the mushrooming component 30 and held from spinning until it is desired to collapse the mushrooming component 30 . there can be many different varieties of hex head screw 20 . as shown in fig1 the screw shaft 26 is integral with or fixed in the base 124 . alternatively as shown in fig2 , 4 , and 7 the hex head screw 20 is an assembly of two parts , the base portion 124 with a hex head base 22 and a screw 126 having screw shaft 26 with threads 28 , a screw hex head 29 having a rim 23 . the hex head 29 on screw 126 mates with a hex head receiving portion 31 in the base portion 124 of hex head screw 20 . the screw 126 with a hex head 29 can be a standard screw , which can be purchased in bulk at low prices from any number of suppliers . the base portion 124 can have the hex head receiving portion 31 for receiving the hex head 29 of screw 126 and then folding a flange 27 over the rim 23 to keep the screw 126 in place relative to the base portion 124 . as shown in greater detail in the applicant &# 39 ; s co pending application ser . no . 09 / 848 , 658 filed may 4 , 2001 titled mounting apparatus having a swivel head , which is hereby made a part hereof and incorporated herein by reference , the flange 27 can be some distance from the hex head receiving portion 31 providing space 33 for a dome portion within the base portion 124 , as shown in fig7 . the dome portion 33 allows the screw hex head 29 to broach into the hex head receiving portion 31 when it is desired to fix the screw in position while in use for compressing the expandable anchor 30 and thereafter to release the screw hex head 29 from the hex head receiving portion 31 so that it can swivel freely in the domed portion 33 . in an alternative embodiment , the self - drilling on pre drilling of the hole in the support 60 would proceed as in prior embodiments , however , instead of a screw hex head 29 the screw head would be replaced by an alternatively shaped head 125 with a slot or other such driver 129 therein as in fig9 . in this embodiment , the threads 228 of the screw shaft 226 can be turned relative to the threads 234 while the mushrooming component 230 is held stationary by a wrench while a screw driver , preferrably connected to a drill , is inserted in the slot 129 or some other means provided the screw head is designed to receive such a turning device . in this manner the mushrooming component 230 is collapsed . as shown in fig9 mushrooming component 230 is internally broached into head 22 and held in place by flange 27 . as shown in fig1 a disposable drill bit 81 fits into machine part 83 that has a hex adaptor portion 82 having a set screw 87 . this fits into a drill chuck 84 to drill a hole in a support 60 . in this embodiment the drill bit 40 is not used . after the hole is drilled a drive shaft 80 having interior hex portions 53 on both ends attaches to the hex portion 82 of the bit adaptor and hex portion 52 of socket 50 allowing the rotation of part 20 while sleeve 70 prevents rotation of mushrooming component 30 . in this manner an installer can use the assembly repeatedly without rechucking his drill . he drills a hole in support material 60 with the drill bit 81 and then attaches the assembly as shown in fig1 and 10 by the assembly of parts 80 , 50 and 70 over hex adaptor portion 82 , to collapse mushrooming component 30 in the support 60 . he then removes the assembly of parts 80 , 50 and 70 to make the drill bit available for drilling the next hole in the support , then inserts another pre assembled non self - drilling screw with expandable anchor 10 in socket 50 and is ready to mushroom another collapsible component 30 in the support 60 . expandable anchor 10 is significantly less expensive without drill point 40 as a component . one of the advantages of the screw with expandable anchor 10 with a drill point 40 thereon is that it can be used with a pole installation method such that the installer need not be on a ladder adjacent the support 60 to drill a hole therein . he can stand on the floor and move about freely without having to reposition a ladder for each installation operation . with this method the installer can also access the support 60 through narrow gaps between pipes , vents or other equipment . the pole and equipment attached thereto can be held at a position considerably below the support 60 for self - drilling a hole therein and collapsing the collapsible anchor 10 . to use this method a threaded rod 90 as seen in fig4 can be threaded to the base of self - drilling hex head screw 20 using threads 25 therein . a long or an extendable pole tool 70 can be used with the threaded rod to match the length of the threaded rod . as shown in fig4 drill chuck 84 receives internally threaded driver 85 , which accepts a length of threaded rod 90 . threaded rod 90 must protrude from the lower end of pole tool 70 . by rotating the assembly comprising the drill chuck 84 , the driver 85 the threaded rod 90 , part 10 and the drill point 40 will self drill through material 60 . once drilling is complete , pole tool 70 is raised to engage collar 74 of seated collapsible anchor portion 30 . the installer grasps pole tool 70 preventing it from rotating while activating drill 84 thus turning threaded rod 90 and internal screw 20 causing collapse of mushrooming component 30 . then pole tool 70 is slid down leaving the complete fastener assembly 10 with threaded rod 90 ready for the intended load to be attached . the pole tool 70 can be extendable to be used with different lengths of rods 90 . alternatively if the installer would prefer to use an embodiment with no drill tip 40 on the mushrooming component 30 he would have to first drill a hole in the support 60 with a drill 84 and the assembly comprising disposable drill bit 81 , and adaptor 83 , and then install the collapsible anchor 10 as described above . as shown in the figures the base of the screw 20 has internal threads 25 providing a connection to the object to be hung therefrom , however the base of screw 20 may use any means of attaching an object thereto . in an alternate embodiment a hole 46 cross drilled through the hex head portion 22 can be used to insert a rod or bolt ( not shown ) for hanging an object or bracket by use of the hole 46 . obviously , many modifications and variations of the present invention are possible in light of the above teachings . it is therefore to be understood that , within the scope of the appended claims , the invention may be practiced otherwise than as specifically described .