fig1 a and 1b illustrate exemplary tray table devices in use in an airplane , in accordance with an embodiment of the present invention . fig1 a is a side perspective view of a tray table device 2 mounted to an existing tray table 1 , and fig1 b is a side view of multiple users 104 , 105 and 106 of tray table devices 101 , 102 and 103 using devices 101 , 102 and 103 in various different manners . in the present embodiment referring to fig1 a , tray table 1 is a compact surface that is collapsible and durable . tray table 1 is approximately 16 . 5 inches by 10 . 5 inches by approximately 1 inch thick , which is a typical size for tray tables of this type , and is attached to a seat back 1 a . fray table device 2 is compact , collapsible , lightweight and durable and may be made of various materials including , without limitation , plastics , rubbers and metals . the dimensions of tray table device 2 preferably range from no greater than 16 . 5 inches by 10 . 5 inches to an approximate thickness of one half inch to 1 . 5 inches . however , tray table devices in alternate embodiments may be larger or smaller . in the present embodiment , tray table device 2 works in conjunction with the limits of space provided by environments such as , but not limited to , an airplane seat back tray table 1 , where size is important for tray table device 2 to perform as desired . tray table 2 preferably does not exceed the width of seat back 1 a so that it may function properly . in the present embodiment , tray table device 2 is mounted to tray table 1 by mounting clips 14 a . fig2 a through 2v illustrate various views of an exemplary tray table device 2 , in accordance with an embodiment of the present invention . fig2 a is a side perspective view of tray table device 2 in a collapsed state . fig2 b is a detailed and partially cut - away view of a frame surface panel hinge 6 a . fig2 c is a diagrammatic top view of a surface panel 3 . fig2 d is a diagrammatic bottom view of surface panel 3 . fig2 e is a side perspective view of tray table device 2 in an open state . fig2 f is a diagrammatic side view of tray table device 2 . fig2 g is a side perspective view of tray table device 2 with stand appendages 8 extended . fig2 h is a side perspective view of tray table device 2 with a removable plug 13 removed . fig2 i is a side perspective view of tray table device 2 with a small electronic device 23 being held by rectilinear fingers 13 a . fig2 j is a diagrammatic top view of a frame 6 . fig2 k is a diagrammatic bottom view of frame 6 . fig2 l is a side perspective view of a stand appendage 8 and a mounting clip 14 a . fig2 m is a side perspective view of the bottom of frame 6 . fig2 n is a side perspective view of tray table device 2 mounted on a tray table 1 . fig2 o is a side perspective view of the bottom of frame 6 with stand appendages 8 extended . fig2 p is a side perspective view of the bottom of a frame stand hinge 6 e . fig2 q is a diagrammatic side view of frame stand hinge 6 e . fig2 r is a side perspective view of the bottom of frame 6 with stand appendages 8 collapsed . fig2 s is a diagrammatic bottom view of frame 6 with stand appendages 8 removed . fig2 t is a bottom perspective view of tray table device 2 mounted to tray table 1 . fig2 u is a diagrammatic rear view of tray table device 2 mounted to tray table 1 , and fig2 v is an exploded view of tray table device 2 with an attachable cushion 12 . referring to fig3 , an alternative embodiment of an adjustable workstation 10 ( hereinafter referred to simply as a “ workstation ”), is shown in use on an airplane seatback 12 tray table 14 . the workstation 10 is adapted to removably affix to the tray table 14 to provide multiple surfaces to create room for objects commonly used in flight , such as a drink 16 , snacks ( not shown ) and a laptop computer 18 , which normally will not fit together on a conventional airplane tray table at once . referring to fig4 , workstations 10 are shown in use aboard an airplane . the first passenger 20 is shown attempting to use a laptop computer 18 on an existing tray table 14 . in this configuration , the laptop screen 28 impacts the seatback 12 from which the tray table 14 extends . this tends to put the laptop screen 28 at an angle unsuitable for both viewing and typing . the laptop computer 18 also takes up all of the room on the tray table 14 . still referring to fig4 , the second passenger 22 is using a workstation 10 to dispose the laptop 18 such that the laptop screen 28 is at the proper angle . the third passenger 24 has the workstation 10 adjusted to dispose the laptop 18 above the tray table 14 . which creates extra room for additional items under the laptop 18 . the fourth passenger 26 has positioned the workstation 10 adjusted to provide a resting surface , while also creating room for additional items . referring to fig5 , the workstation 10 comprises three panels , a top panel 100 , a middle panel 200 , and a bottom panel 300 . the top panel 100 , middle panel 200 and bottom panel 300 are hingedly connected , in a manner such that the top panel 100 and bottom panel 300 are connected to opposite sides of the middle panel 200 . in the illustrated embodiment hinge pins 30 are used to create a hinged connection . referring to fig6 and 7 alternative hinging arrangements are shown . in any event , various hinged arrangements , for instance barrel hinges , butterfly hinges , or even living hinges may be used depending on desired characteristics . in one preferred embodiment , the workstation 10 is approximately 16 . 5 inches by 10 . 5 inches to fit on a conventional tray table ( not shown ) referring to fig8 , the top panel 100 of the workstation 10 includes features useful for holding objects , such as a laptop computer ( not shown ) on the workstation 10 . among other features , the top panel 100 may include a front holding bar 102 for preventing items from slipping off the top panel 100 when disposed at an angle . a back holding bar 104 may also be incorporated on the opposite side of the top panel 100 . in addition to the front holding bar 102 and back holding bar 104 , the top panel 100 may incorporate a holding slot 106 for holding objects such as tablet computer ( not shown ), and include rubberized strips 108 for preventing slippage . referring to fig9 , the workstation 10 is shown in expanded for use . the top panel 100 is shown with the front holding bar 102 and back holding bar 104 in a raised configuration . the top panel 100 is designed with cut - outs 110 , which allow the front holding bar 102 and back holding bar 104 to rest flush with the top panel 100 when not in use . in order to raise the front holding bar 102 and back holding bar 104 , pins 30 may be used to create an articulating arrangement . still referring to fig9 , the middle panel 200 is generally horseshoe shaped , including two arm members 202 extending from the top panel 100 to the bottom panel 300 , and a center member 204 connecting the two arm members 202 and connecting the middle panel 200 to the top panel 100 . the ends of the arm members 202 opposite the center member 204 connect the middle panel 200 to the bottom panel 300 . the bottom panel 300 includes a retractable shelf 302 , which a user may pull out , thereby creating more space . in a preferred embodiment , the retractable shelf 302 may include a handle 304 , a ring - like soda can holder 306 , and a conventional drink holder 308 , which may be a hollow circle , thereby allowing a drink cup ( not shown ) to depend from the underside of the retractable shelf 302 . the bottom panel 300 may also include tracks 310 for adjusting the position of the workstation 10 . still referring to fig9 , the workstation 10 is adjusted and positioned by a series of arms 32 , which extend between the top panel 100 and the middle panel 200 , and between the middle panel 200 and the bottom panel 300 . the arms 32 between the top panel 100 and the middle panel 200 articulate from hinge pins 30 in the top panel 100 , allowing the arms 32 to swing downward and engage tracks 206 in the middle panel 200 . when not in use the arms 32 between the top panel 100 and the middle panel 200 may be articulated into housings ( not shown ) on the underside of the top panel 100 making them flush with the top panel 100 for storage , and to allow the top panel 100 to rest flat against the middle panel 200 . still referring to fig9 , in addition to the arms 32 between the top panel 100 and middle panel 200 , folding supports or arms 32 are also disposed between the middle panel 200 and bottom panel 300 . like the arms 32 between the top panel 100 and middle panel 200 , the arms between the middle panel 200 and bottom panel 300 are hinged , preferably by pins 30 to the middle panel 200 such that they may be articulated downward to engage tracks 34 on the bottom panel 300 . because the position of the middle panel 200 has a large effect on the overall position of the top of the workstation 10 , it is anticipated that multiple tracks 34 will be located on the bottom panel 30 to create a variety of positions . still referring to fig9 , in some instances , it may be desirable to have a very slight angle to the top panel 100 . since the arms 32 depending from the middle panel 200 place the top panel 100 at a more extreme angle , the bottom panel 300 may also include articulating tabs 310 . like the arms 32 , the tabs 310 are preferably disposed in the bottom panel 300 when not in use , and articulate into position by pins 30 . the tabs 310 may also engage tracks 34 located on the underside of the middle panel 200 . fig1 shows the workstation 10 with the retractable shelf 302 extended . in one embodiment , the retractable shelf 302 may be guided by shelf guides 312 incorporated into the bottom member 300 . fig1 shows the workstation 10 set up in an alternate configuration , where creating an additional work surface is not necessary , but where an angled work surface is preferred . in this illustration , the top panel 100 and middle panel 200 have been angled relative to the bottom panel 300 to create a slanted surface , such as for reading . in order to prevent objects on the top panel 100 from sliding therefrom , the front holding bar 102 has been articulated into a holding position . the arms 32 depending from the middle panel 200 are shown engaging the preferred tracks 34 on the bottom panel 300 , thereby preserving the angle of the top panel 100 and middle panel 200 . fig1 and 13 show the workstation 10 in another configuration . in this view a lock 36 on the underside of the top panel 100 fits into a catch 38 on the middle panel . the lock 36 may be coated with flexible material such as rubber , enabling the material to expand and hold the top panel 100 tight against middle panel 200 . ideally , manual pressure can separate and join the lock 36 and catch 38 . a user may then adjust the supporting arms 32 to hold the top panel 100 at a preferred angle . fig1 illustrates how a hollow space 206 in the middle panel 200 can be used for storage . in the illustrated example a tablet computer 40 is shown resting in the hollow space 206 . in one embodiment , the top panel 100 may have a complimentary holding slot 112 to provide more room for storage . in order to hold an object securely , the middle panel 200 may also have a rubberized hold 208 to prevent slippage . fig1 shows the underside of the workstation 10 , including a mechanism for holding the workstation 10 on a surface . in the illustrated embodiment , anchoring clips 314 are inserted along slide guides 316 where they are held in place . the sliding nature of the anchoring clips 314 enables them to be easily removed from the slide guides 316 when not needed . also shown in fig1 are feet 318 , preferably rubber feet 318 , for preventing the workstation 10 from sliding on a surface . also shown are mounts 320 , for affixing the workstation 10 to a surface . fig1 shows the workstation 10 mounted on a tray table 14 . in this view , the workstation 10 is mounted such that the anchoring clips 314 slide over the forward portion of the tray table 14 . in alternate embodiments , the clips or another mounting mechanism may engage the sides or bottom of the tray table 14 . fig1 is an exploded view of the workstation 10 . in this view , another mounting mechanism is shown in the form of a standard tripod nut 322 . fig1 a - 17c show how the workstation 10 may be incorporated into a tray table having an indented area . in fig1 a , the workstation 10 is shown in its expanded configuration and ready for use . fig1 b shows a modified seatback 12 tray table 14 , having a receptacle 42 designed for holding the workstation 10 or a similar flat object . fig1 c shows the workstation 10 collapsed and installed in the receptacle 42 . in this manner , the workstation 10 can be easily collapsed when meals or other objects are placed on the tray table 14 . ideally , the workstation 10 will be of a thickness relative to the receptacle 42 to present a uniform surface as shown in fig1 c . fig1 a - 18b show the workstation 10 as designed to be incorporated onto a carrying bag 44 . fig1 a shows the workstation 10 prepared for installation on a carrying bag 44 having catches 46 installed on the exterior of the carrying bag 44 . it is anticipated in one embodiment that the catches 46 will engage the mounts 320 ( not shown ) on the bottom panel 300 ( not shown ), allowing the top panel 100 to be exposed to view . fig1 b shows the workstation installed on a carrying bag . fig1 a - 19b show the workstation 10 as designed to be incorporated onto a travel pillow 48 . fig1 a shows the workstation 10 prepared for installation on a travel pillow 48 . like the carrying bag 44 ( not shown ), the travel pillow 48 includes catches 46 installed on one side for attaching to the workstation 10 . fig1 shows the workstation 10 attached to the travel pillow 48 . in this illustration , the workstation 10 is in use , with the top panel 100 and middle panel 200 raised relative to the bottom panel 300 with arms 32 for support . in this configuration , the travel pillow 48 provides a soft surface for resting the workstation 10 on a person &# 39 ; s lap ( not shown ). fig2 a - 20c show the workstation 10 affixed to a tripod 50 . fig2 a shows the workstation 10 attached to the tripod mount using the tripod nut 322 ( not shown ), allowing the workstation to be tilted into at any preferred angle , including flat , as shown , enabling the workstation 10 to function as a table . fig2 shows the workstation 10 and tripod 50 functioning as an easel . by raising the top panel 100 and middle panel 200 relative to the bottom panel 300 with arms 32 for support , the workstation provides a slanted surface with which to hold a canvas 54 . the canvas 54 is held in place by the front holding bar 102 . also in this view , the retractable shell 302 is extended for holding an object such as a palette ( not shown ). fig2 c shows the workstation 10 affixed to a tripod 50 and extended to create an upper and lower surface . in this manner , items may be held on both the top panel 100 and bottom panel 300 easily and conveniently .
a portable workstation includes a top panel having a distal edge and a lower surface . also included are a bottom panel having a proximal edge and an upper surface , and a middle panel connected by a hinge to the distal edge and to the proximal edge . the middle panel and the bottom panel are spanned by a first folding support . the middle panel and the top panel are spanned by a second folding support , so that the first folding support and the second folding support hold the top panel , the bottom panel , and the middle panel in a predetermined , expanded position .