referring now to fig1 - 5 , there are shown various views of an exemplary embodiment of a projection screen system , generally designated 10 , of the present invention in a screen storage arrangement . system 10 includes a protective housing 12 formed of a top wall or panel 14 having opposite side edge portions from which downwardly extend side wall 16 and side wall 18 . the shown orthogonal configuration of side walls 16 and 18 with respect to top wall 14 results in housing 12 having an inverted square u - shaped configuration , but other wall arrangements may be utilized in alternate embodiments . housing 12 is fabricated from a lightweight and strong material such as aluminum . housing 12 is preferably formed in one - piece in an extrusion process , but may be formed in alternate fashions , such as by rigidly interconnecting separate panels or plates . along its longitudinal length that extends from end 20 to end 21 , housing 12 is uniformly configured , and therefore the shapes of the housing shown in fig3 - 5 are representative rather than merely coincidentally similar . in the shown embodiment , housing 12 is symmetrical about a vertical plane longitudinally extending through line 164 shown in fig3 and therefore housing 12 may be installed such that either side wall 16 or side wall 18 is the front wall ( i . e . the housing wall closer to the center of the room in which projection screen system 10 is to be viewed ). housing side wall 16 includes a pair of screw channels 23 , and side wall 18 includes a pair of screw channels 24 . end cap 27 is attached to housing 12 by four screws 29 that insert into screw channels 23 and 24 and closes off the end of the interior volume defined by housing 12 . end cap 28 is similar attached with screws 30 to cap the opposite housing end . end caps 27 and 28 are formed of a high strength material , such as steel . end caps 27 , 28 respectively include upper flanges 33 , 34 that each include two apertures as shown in dotted lines in fig2 . the apertured flanges 33 , 34 may be attached to a support member of a structure in which projection screen system 10 is to be installed with any of a variety of conventional fasteners , such as threaded rods with locking nuts and wires as indicated in fig1 at 36 and 37 , respectively . housing 12 may alternatively be directly attached to the support member by fasteners that extend through a housing wall , such as top wall 14 . installed within the interior volume 38 formed by walls 14 , 16 and 18 is a junction box , generally designated 40 , that furnishes a protected compartment for the electrical connections between projection screen system 10 and a conduit to the installation structure &# 39 ; s power supply . junction box 40 includes vertical side flanges 42 and 43 and a bottom facing horizontal flange 44 that substantially span the entire horizontal space between side walls 16 and 18 . self - tapping screws 46 and 47 that fit through tabs 49 , 50 horizontally extending from box flanges 42 , 43 insert into a screw channel 52 formed into housing top wall 14 to mount junction box 40 to housing 12 . junction box 40 may be manufactured by orthogonally bending a suitably sized and shaped single piece of sheet metal into the shown configuration . junction box 40 is positioned directly below an entry hole 55 in housing top wall 14 through which an electrical conduit ( not shown ) connected to a structure &# 39 ; s power supply can be inserted . bottom flange 44 includes a rectangular opening 57 which allows access to the interior or contents of box 40 . a junction box cover plate 59 , shown in dashed lines in fig2 is attached to bottom flange 44 with not shown screws that insert through four holes 60 in flange 44 . a second opening 62 adapted to installably receive a power connector is also provided through bottom flange 44 . mounted to junction box 40 and positioned within the interior of box 40 is a power connector abstractly shown in fig1 at 64 . connector 64 includes a socket portion 65 from which extend four wire leads 67 . socket portion 65 snap fits into flange opening 62 during installation so as to permit its connection with a complementary power connector in a convenient fashion and without removing cover plate 59 . socket portion 65 includes hollows or sockets within its body that receive projecting plugs of a plug portion of a power connector . in the shown embodiment in which four wire leads 67 are employed , socket portion 65 includes four separate plug receiving sockets . wire leads 67 , with the use of wire nuts ( not shown ), are attached to the end of the electrical conduit ( not shown ) hardwired into the building . a quick disconnect power connector external to junction box 40 is shown at 70 and includes a plug portion 72 from which project individual plugs insertable into the sockets of power connector 64 . power connector 70 is circuited with a power cord 74 connected to screen motor 76 . power connectors 64 and 70 may be readily mated together as described further below to operatively circuit motor 76 to the building &# 39 ; s electrical power supply . one suitable type of power connector is available from amp incorporated of harrisburg , pa . as universal mate - n - lok connectors . other styles of plug / socket connectors , as well as other types of connectors readily connectable without handling of potentially hot wiring , may be substituted for the shown connectors 64 and 70 within the scope of the invention . as shown in fig3 downwardly projecting from top wall 14 are two l - shaped projections or interactive members , generally designated 80 and 84 , that extend the longitudinal length of housing 12 and allow for the adjustable attachment of a projection screen assembly to housing 12 . projection 80 includes a vertically projecting flange 81 that terminates with a horizontally extending lip portion 82 pointing toward the middle of top wall 14 . the upper surface of lip portion 82 is spaced from the region of top wall 14 which it overlays to provide an insertion space for bracket mounting as described below . projection 84 is a mirror image of projection 80 and includes flange 85 and lip portion 86 , which points toward lip portion 82 . projections 80 and 84 are integrally formed with top wall 14 , but in alternate embodiments may be provided on side walls 16 and 18 , such as if a roller is to be mounted to that side wall . differently shaped projections , such as slat - shaped flanges that are inclined relative to top wall 14 , may be substituted for the l - shaped projections shown . in addition , the insertion spaces defined by projections 80 and 84 may be provided by recesses provided in the housing walls within the scope of the invention . a projection screen assembly that may be readily mounted to housing 12 subsequent to the installation of housing 12 in a building is generally designated 100 and includes brackets 102 and 104 directly attachable to housing 12 . fig6 a and 6b are further described as showing views of bracket 102 , but this shown bracket configuration enables its use as either bracket 102 or 104 , which simplifies manufacture and assembly . bracket 102 includes an attachment flange 106 from which downwardly extends support flange 108 . four tapped holes 107 through flange 106 receive set screws 116 ( see fig1 ). the end regions 110 and 112 of flange 106 serve as attachment lugs or interactive members . attachment lugs 110 , 112 have a thickness insertable into the space between top wall 14 and the lip portions 82 and 86 of lipped projections 80 and 84 . attachment lugs 110 and 112 further are sized such that the distance from the outward edge of attachment lug 110 to the outward edge of attachment lug 112 , as measured in a direction perpendicular to a roller when installed to bracket 102 , is greater than the distance between the tips of lip portions 82 and 86 but less than the distance between flanges 81 and 85 . diagonally opposite or catercorner portions 113 and 114 of attachment lugs 110 and 112 are rounded such that the diagonal length therebetween is less than the distance between flanges 81 and 85 to allow a rotational bracket installation described further below . support flange 108 includes horizontally spaced apertures 115 , vertically spaced apertures 119 , and a central aperture 121 . apertures 119 and 121 are not used in bracket 102 , but when a bracket shaped as shown in fig6 a and 6b is used as bracket 104 , such apertures respectively receive dampener mounting screws and an idler shaft as described further below . bracket 104 is configured identical to bracket 102 and generally includes an attachment flange 117 and support flange 118 ( see fig1 ). although configured as an outwardly extending and coplanar continuation of bracket flange 106 in the illustrated embodiment , attachment lugs 110 and 112 may be differently configured within the scope of the present invention . in alternate embodiments , for example , lugs 110 and 112 may be provided as tabs projecting from support flange 108 , or as movable members shiftable along attachment flange 106 . operationally supported by bracket 102 is the electric motor 76 connected to power cord 74 . the rotatable output shaft of motor 76 is operationally attached to a cylindrical roller 120 in a well known fashion . motor 76 includes a square stud ( not shown ) that projects from the motor housing and inserts into a square throughbore provided in a finned insert ( not shown ) made of aluminum molded into dampener 128 . the finned insert engages the motor housing stud to prevent relative rotation therebetween . sound dampener 128 is formed of thermoplastic rubber and includes two laterally extending projections 130 into which are integrally molded t - nuts 132 . a pair of screws 134 extend through apertures 115 in support flange 108 and engage the internal threads of t - nuts 132 to mount dampener 128 to bracket flange 108 . shown wound around roller 120 and unwindable therefrom upon roller revolution is a sheet of fabric 122 that serves as a projection screen . projection screen 122 is shown in fig1 - 5 in a retracted position fully stored within the protective housing 12 . as is conventional when used as a front projection screen , one surface of fabric sheet 122 is of the type of material on which images may be projected for viewing , and the opposite surface is formed of an opaque material . the lower end of fabric sheet 122 is looped and secured around a dowel abstractly indicated at 126 . dowel 126 serves as a suspended weight that causes screen 122 to descend in a relatively planar configuration as it unwinds from roller 120 . at the end of roller 120 opposite the end to which motor 76 is attached , an idler shaft 137 is fixed to roller 120 to be rotatable therewith . idler shaft 137 extends through a flanged nylon bushing 139 mounted within thermoplastic rubber dampener 141 , and through a central aperture ( corresponding to aperture 121 through support flange 108 ) in support flange 118 . slipped over the end of idler shaft 137 is a washer 143 , and spring clip 145 attaches around shaft 137 to prevent shaft 137 from being axially withdrawn through flange 118 . two screws 147 , 149 insert through vertically spaced holes through flange 118 to threadedly engage t - nuts ( not shown ) integrally molded into dampener 141 to mount dampener 141 to flange 118 . with particular reference to fig3 a lipped projection 154 projects inwardly from an interior surface 153 of an outwardly offset lower region 152 of housing side wall 16 . a second lipped projection 156 projects from surface 153 below projection 154 . lipped projections 154 and 156 extend the longitudinal length of side wall 16 . the outwardly offset lower region 158 of housing side wall 18 similar includes lipped projections 160 and 162 , which are mirror images of projections 154 and 156 . a bottom closure panel 166 made of aluminum that extends the entire longitudinal length of housing 12 and which has a uniform cross - section along its length includes an attachment member 168 comprising hook end 170 . closure panel 166 is sized narrower than the space or opening between side walls 16 and 18 such that when attached to either side wall 16 or side wall 18 , closure panel 166 defines a slot shaped gap 172 with the side wall to which it is not attached . the projection screen 122 can be lowered and raised through this gap 172 during system operation . hook end 170 fits over the upturned lip of lipped projection 154 as shown in fig3 to mount closure panel 166 to side wall 16 . the lip of lipped projection 156 provides an enlarged bearing surface against which the side surface of attachment member 168 abuts when installed . an upstanding longitudinal rib 174 stiffens panel 166 to resist panel bowing . nub 176 that laterally extends from rib 174 and a longitudinally extending l - shaped rib 178 define a channel 180 . not shown brackets insertable into channel 180 at opposite ends of panel 166 include upstanding leaf spring portions with longitudinally projecting pins . apertures ( not shown ) on end caps 27 and 28 receive the pins of the leaf spring portions when closure panel 166 is installed to line up the panel housing and prevent panel sag . attachment member 168 may be used to attach to either lipped projection 154 or 160 due to the projections complementary structure with member 168 . other detachable , interconnecting structures , including housing recesses or apertures that releasably receive prongs of the closure panel , may be employed within the scope of the invention . referring now to fig7 and 8 , the installation adaptability afforded by the configuration of the housing and closure panel of projection screen system 10 is further illustrated . fig7 diagrammatically shows projection screen 122 unwinding from roller 120 installed within housing 12 and passing through gap 172 . as closure panel 166 is mounted to side wall 16 , gap 172 is provided between the edge of panel 166 and side wall 18 . depending on the requirements of a user of system 10 , the viewing surface of screen 122 may be furnished on either surface 183 or surface 184 . in screens fabricated with only one surface being a viewing surface , the direction that surface faces is controlled by the manner in which screen 122 is wrapped around roller 120 . in the diagrammatic view of fig8 closure panel 166 is mounted to side wall 18 and consequently projection screen 122 unwinding from roller 120 passes through gap 172 formed between the edge of panel 166 and side wall 16 . the viewing direction of screen 122 in fig8 may be from either side . the structure of projection screen system 10 will be further understood in view of the following explanation of its installation and operation . a first stage of installation typically involves mounting an assembly including housing 12 to the structure , such as to a beam above the room in which system 10 is intended to be used . after end caps 27 and 28 and junction box 40 are preinstalled or fastened to the housing ends and top wall 14 , respectively , end caps 27 , 28 may be used to mount this screen assembly to the structure . at this stage of installation , the remainder of projection screen system 10 is not installed within housing 12 . for example , roller 120 with projection screen 122 , as well as roller mounting brackets 102 and 104 , have yet to be installed , and for that matter may be safely held in storage at another location where it is clear of the risk of damage from the construction site environment . after housing 12 is secured to the structure , an electrical conduit is routed through entry hole 55 and into junction box 40 . after an electrician removes cover plate 59 and electrically interconnects lead wires 67 to the appropriate wires of the electrical conduit , socket portion 65 is snap fit into opening 62 of junction box 40 and cover plate 59 is fastened to flange 44 . projection screen assembly 100 is subsequently installed to the previously installed housing assembly . this installation step , which may occur immediately after housing 12 installation but normally is delayed until construction of the building is essentially complete , begins with roller mounting brackets 102 and 104 separated from roller 120 . roller bracket 102 is manipulated by an installer such that attachment flange 106 rests substantially flush with the interior surface of housing top wall 14 between lipped projections 80 and 84 . due to the span of attachment lugs 110 and 112 being larger than the gap between lip portions 82 and 86 , to so manipulate bracket 102 an installer must arrange bracket 102 in a rotational orientation different from the installed arrangement shown in fig1 such as about a forty - five degree rotation counter - clockwise from the perspective of a fig2 viewer therefrom . as bracket 102 is then rotated ( in a clockwise direction from the perspective of a fig2 viewer ) while being held at the same elevation , attachment lugs 110 , 112 are rotated into the insertion spaces between top wall 14 and lip portions 82 and 86 . the truncated corner portions 113 and 114 do not engage the flanges of the lipped projections and thereby do not prevent this rotational insertion of the attachment lugs 110 and 112 . the underside of attachment lugs 110 and 112 abut the upper surfaces of lips 82 and 86 to prevent bracket 102 from falling out from housing 12 . after bracket 104 is mounted to housing 12 in a similar fashion , namely by first positioning it in a rotational offset arrangement and rotating it such that the attachment lugs of its attachment flange insert and engage the attachment lips 82 and 86 , the roller 120 and its associated mounting accessories may be installed between the mounted brackets . the longitudinal position of roller 120 may be adjusted along the length of housing 12 by sliding brackets 102 and 104 within the channel defined between projections 80 and 84 . when the proper longitudinal positioning of screen 122 has been achieved , the set screws through the attachment flanges of each of the roller mounting brackets may be tightened to lock brackets 102 and 104 , and thereby lock screen 122 in its longitudinal position . next , an operator may take the power connector 70 attached to power cord 74 and simply plug it into the exposed socket portion 65 of power connector 64 . it will be appreciated that no electrician is required for this plug insertion , but rather a person with minimal mechanical aptitude may complete the circuiting of electrical motor 76 with the power supply . the next installation step is to mount bottom closure panel 166 . an installer may simply maneuver closure panel 166 such that hook end 170 fits over lip projection 154 . this positioning may be performed by tilting upward the end of the panel opposite attachment member 168 and then lowering it after the hooking process is complete . after the closure panel has been manipulated such that the brackets mounted in channell 80 engage the apertures of end caps 27 and 28 , installation is complete . subsequent operation of motor 76 allows roller 120 to revolve , which in turn causes projection screen 122 to unwind therefrom and pass down through gap 172 to a lowered position where an image can be projected on its surface for viewing . motor 76 is reversible to wind screen 122 around roller 120 to raise screen 122 . it will be recognized that if an installer wishes to have the screen unwind from the opposite side of roller 120 , the screen assembly may be flipped and the closure panel 166 mounted to lipped projection 160 . housing 12 need not be removed from its installed position to achieve this modification . while this invention has been shown and described as having multiple designs , the present invention may be further modified within the spirit and scope of this disclosure . this application is therefore intended to cover any variations , uses , or adaptations of the invention using its general principles . further , this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains .