fig1 shows a light shelf assembly 10 mounted to structural members 12 a , 12 b , e . g ., metal studs of a wall of a building or a mounting framework for a plurality or array of light shelves , e . g ., stacked one above another with a spacing there between . the assembly 10 may include a shelf 14 with a panel 16 formed from sheet metal , such as aluminum or an aluminized plastic to confer reflectivity to the surface ( s ) of the panel 16 . the panel 16 may be painted with reflective paint , such as aluminum or white paint . in addition , the panel 16 could be made from a polymeric material , which could be translucent or opaque . alternatively , the panel 16 may be composed of a variety of rigid or flexible materials with a variety of visual characteristics . in the embodiment shown , the panel 16 is supported in a frame 18 , e . g ., made from extruded aluminum alloy , like that used to make aluminum windows and doors . alternatively , the frame may be made from other materials , such as plastic , wood , stainless steel or other types of metals . the frame 18 and / or panel 16 is attached to a base member 20 that spans the width of the panel 16 and frame 18 . as shall be described further below , the base member 20 is connectable to a structure via mounting assemblies 22 , 24 . fig2 and 3 show that the mounting assemblies , 22 , 24 feature a receiver portion 26 ( receiver ) and an inserter portion 28 ( inserter ). the receiver 26 may be fastened to a support member , such as structural member 12 a or 12 b , via fasteners 30 , such as bolts , screws , rivets , nails , etc . alternatively , the receiver 26 may have other coupling features , such as integral hooks that insert into apertures in a structural member 12 a or 12 b , similar to peg board hooks or other conventional removable shelf hooks . in the embodiment shown , the receiver 26 may be used in both mounting assemblies 22 and 24 to support both sides of the shelf 14 , such that specialized right and left receivers are not required . the receiver 26 has a lower bracket 32 and an upper bracket 34 which extend laterally from an upright portion 36 , which extends longitudinally and which receives the fasteners 30 to hold the receiver 26 to a structural member 12 a or 12 b . as described below in reference to fig1 , in another embodiment , the lower bracket 32 and the upper bracket 34 may extend at different angles relative to the upright portion 36 to accommodate different installation requirements . the lower bracket 32 and the upper bracket 34 are separated by a slot 38 . the inserter 28 has an insertion leg 40 , a pair of base attachment legs 42 , 44 , and an abutment leg 46 with an extension 48 to which the frame 18 may be attached . as described below in reference to fig8 a - 10 c , the inserter 26 may utilize features that promote bending of an overloaded mounting assembly too avoid disengagement from a structural member 12 a , 12 b . the inserter 28 may be fastened to a base member 20 by sliding the base attachments legs 42 , 44 into a hollow 50 of the base member 20 , and retained therein by fasteners 52 that are received in apertures 54 . similarly , the frame 18 is held to the extension 48 by fasteners 56 and apertures 58 . a groove 60 may be provided in the base member 20 to receive a panel 16 , which is not shown in fig2 and 3 . the depth and width of the groove 60 may be varied to accommodate panels 16 having different sizes and thicknesses . a set screw 61 is received in threaded aperture 61 a in abutment leg 46 and may be used to adjust the position of the shelf 14 , i . e ., by encountering abutment support surface 70 and pushing the abutment leg 46 away from the abutment surface 70 to a selected degree . fig4 a shows a receiver 26 fastened to a structural member 12 b juxtaposed next to an inserter 28 . the inserter 28 has an insertion leg 40 and an abutment leg 46 . a frame 18 is attached to the inserter 28 and depends downwardly therefrom for supporting a panel 16 ( not depicted ) of a shelf 14 . the shelf 14 would typically be held by a person ( installer ) in their hands and lifted and moved through the sequence of movements shown in fig4 a - 4 f in order to assemble and position the inserter 28 into the receiver 26 to hold the shelf 14 at a desired position . the lower bracket 32 of the receiver 26 has a floor 62 extending between a back wall 64 and a front wall 66 , which extends upwardly to form a lip 68 . the lip 68 is adjacent an abutment support surface 70 . the upper bracket 34 has a downwardly depending block 72 which defines a recess 74 proximate back wall 64 and a relief 76 opposite to the lip 68 of the lower bracket 32 , which defining a threshold gap 78 through which the insertion leg 40 may be passed into the slot 38 . fig4 b shows the insertion leg 40 as it is inserted into the threshold gap 78 . in the embodiment shown , the insertion leg 40 has a rectangular cross - section , such that the insertion leg will only clear the threshold gap 78 if held in the orientation depicted , i . e ., with the smaller dimension of the rectangular cross - section of the insertion leg 40 parallel to the threshold gap 78 , i . e . extending across the gap 78 . this dimensional relationship may be used to control the angle at which the insertion leg 40 may be passed into and out of the slot 38 , e . g ., to prevent inadvertent removal during assembly , adjustment and disassembly of the light shelf assembly 10 ( and consequently the orientations of the shelf 14 that enable / disable these functions ). in the embodiment shown in fig4 b , the shelf 14 is perpendicular to the horizon / ground for insertion . the threshold gap 78 may be modified to permit / require different angles of insertion of the insertion leg 40 and may be enlarged so as to allow insertion at any angle . as shown in fig4 c , once past the threshold gap 78 , the insertion leg 40 may drop down and rest on the floor 62 proximate the lip 68 . since a pair of mounting assemblies 22 , 24 may be used to support a shelf 14 , the engagement between the inserter portion 28 and the receiver portion 26 may take place on the mounting assemblies 22 , 24 on opposite sides of the base member 20 , such that the shelf 14 may be hung in the position shown in fig4 c without the support of a person . the installer can therefore release the light shelf 10 and it will hang from the assemblies 22 , 24 . fig4 d and 4 e show that the shelf 14 can be pivoted up on the insertion leg 40 within the slot 38 and slid back until the insertion leg 40 encounters back wall 64 . as shown in fig4 d , the pivoting of the insertion leg 40 is conducted while the insertion leg 40 is positioned proximate the lip 68 , allowing the abutment leg 46 to clear the lower bracket 32 as it swings upward . fig4 e shows that once the abutment leg 46 is clear of the lower bracket 32 and held at an angle b relative to the horizontal h , the insertion leg 40 can be slid back to the rear wall 64 , bringing the abutment block 46 over the abutment support surface 70 . fig4 f shows that when the shelf 14 is then swung down to the horizontal position , the abutment leg 46 or the adjustment set screw 61 ( see fig3 ) comes to rest upon the abutment support surface 70 and the insertion leg 40 pivots up into engagement with the recess 74 and is held in that position by the force of gravity g . the insertion leg 40 engaging the recess 74 resists forces directed perpendicular to the support member 12 b , and in cooperation with the abutment leg 46 and abutment support surface 70 , provides a cantilevered mounting for the shelf 14 , which is held in a horizontal orientation . if removal of the shelf 14 is desired , it can readily be accomplished by reversing the foregoing procedure . as can be appreciated , the shelf 14 can be adjusted between a depending orientation to a horizontal orientation and installed and removed from a mounted receiver 26 without tools . referring to fig2 and 3 , one or more set screws 79 may be used to adjust the angle of the shelf 14 . more particularly , the degree to which the set screw 79 protrudes through the abutment leg 46 and pushes the abutment leg away from the abutment surface 70 can be adjusted by turning the screw 79 in or out , varying the angle of the shelf 14 relative to the horizontal orientation . fig5 shows a corner 80 , e . g ., of a room in which a pair of light shelf assemblies 82 a , 82 b have been installed . the light shelf assemblies 82 a , 82 b have similar features as the light shelf assembly 10 described above in reference to fig1 - 4 , except for mitered edges 84 a , 84 b , which allow close relative juxtaposition in corner 80 . as before , the light shelf assemblies 82 a , 82 b are mounted to structural members 86 , e . g ., studs of a wall of a building or a mounting framework for a plurality or array of light shelves . the light shelf assemblies 82 a , 82 b may include a shelf 88 a , 88 b , with a panel 90 a , 90 b , respectively , formed from the same type of materials described above in reference to the embodiment shown in fig1 . the panels 90 a , 90 b may be supported in a corresponding frame 92 a , 92 b , respectively , e . g ., made from extruded aluminum alloy , like that used to make aluminum windows and doors . alternatively , the frame 92 a , 92 b may be made from other materials , such as plastic , wood , stainless steel or other types of metals . the frames 92 a , 92 b and / or panels 90 a , 90 b are attached to base members 94 a , 94 b . as before , the base members 94 and 94 b are connectable to a structure via mounting assemblies 96 a , 96 b that are like the mounting assemblies 22 , 24 described above , but also by mitered corner mounting assemblies 98 a , 98 b that have features providing a relative mitered fit one to another . fig6 and 7 show that the mitered mounting assemblies , 98 a , 98 b feature a receiver portion 100 having a mitered face 102 which is disposed at angle c , e . g ., 45 degrees relative to opposing face 104 . the inserter portion 106 features an extension 108 with a distal portion 110 that extends from a root portion 112 at an angle d , e . g ., 135 degrees . the angled extension 108 holds frame 92 a at acute angle e , e . g ., 45 degrees , relative to base member 94 a when coupled to the inserter portion 106 . end 114 of frame 92 a is cut at an angle f , e . g ., 45 degrees , to cover distal portion 110 up to the root portion 112 . as shown in fig5 , the mitered mounting assemblies 98 a , 98 b are mirror images of one another , such that they conjoin in a complementary , mitered relationship to fit in corner 80 . beyond the foregoing differences , the mitered mounting assemblies 98 a , 98 b are constructed and function in a similar manner to the mounting assemblies 22 , 24 described above in relation to fig1 - 4 . each of fig8 a - 10 c show inserters 120 . 130 . 140 , respectively , which have the same basic form and function as the inserters 28 and 106 described above with respect to fig1 - 7 , but illustrating different approaches to limiting the bending strength thereof . more particularly , fig8 a and 8 b show an inserter 120 having an aperture 122 extending through the inserter 120 proximate the junction of the extension 126 and the abutment leg 128 and having an orientation approximately perpendicular to the threaded aperture 124 ( which would receive an adjustment set screw ( not shown ) like screw 61 of fig3 ). the aperture 122 is dimensioned to reduce the bending strength of the inserter 120 , such that the extension 126 is likely to bend relative to the abutment leg 128 prior to the failure of mounting screws 30 ( see fig3 ) holding a cooperating receiver 26 , e . g ., as shown in fig3 . in the instance of an unexpected loading of a light shelf , e . g ., 14 or 88 a , e . g ., due to an installer pulling on the shelf 14 or 88 a , bending is preferred in that it occurs more gradually , allowing perception of the bending movement and corrective action to be taken ( encouraging the installer to stop pulling on the shelf . in addition , early bending limits the amount of force that can build up in the system . fig1 shows a receiver 150 affixed to a structural member 152 that is disposed at an angle k relative to plumb p . the receiver 150 has a lower bracket 154 and an upper bracket 156 that extend from the base attachment leg 158 at an angle that , in cooperation with an inserter 160 supports the light shelf 162 in a horizontal orientation . a receiver 26 like that shown in fig2 and 3 would have an orientation like that illustrated by the lower bracket 164 shown in dotted lines , if installed on an angled structural member 152 and would require a re - orientation through angle q , in order to hold the shelf horizontal . a receiver 26 , 152 may be selected with a lower bracket 32 , 154 and upper bracket 34 , 156 orientation that provides a desired incidence angle i and reflection angle r for light l , such that the reflected light rl is directed to a desired location within a given building for any given structural member 12 a , 152 orientation . it will be understood that the embodiments described herein are merely exemplary and that a person skilled in the art may make many variations and modifications without departing from the spirit and scope of the claimed subject matter . for example , while the disclosure has been expressed in terms of apparatus for supporting light shelves , the apparatus disclosed herein could be utilized to support other types of horizontal members , shelves and support surfaces , e . g ., storage shelves . all such variations and modifications are intended to be included within the scope of the appended claims .
a mounting assembly for connecting a light shelf to a structure in cantilever fashion . a pair of receiver units attach to the structure and each has a pair of brackets with a slot there between . a recess is formed on an upper interior surface of the upper bracket . the lower bracket has an abutment support surface distal to the structure . a pair of inserter units attach to opposite sides of the shelf , each having an insertion leg and an abutment support . the insertion leg inserts into the recess of a corresponding receiver when the abutment support rests on the abutment surface . the weight of the shelf pulls the abutment support into engagement with the abutment surface and pushes the insertion leg into engagement with the recess , holding the shelf horizontally .