as shown in fig1 and 3 , this invention comprises a plurality of corner connectors 1 with projecting engaging bars 10 , a plurality of aluminum - extruded hollow skeletons , or skeletal frame members , 2 with plate member inserting grooves 20 , hollow sections 14 for receiving engaging bars 10 , and a plurality of plate members 3 for locking the foregoing elements together . a slot 21 in the shape shown in fig4 is in the position between two plate member inserting grooves 20 on the hollow skeleton 2 and may communicate with the slot 21 in another hollow skeleton 2 connected to the same corner connector 1 through slot 11 of the corner connector 1 ( as shown in fig1 ), so a power source wire may be installed through this slot 21 . a stopper , or retainer , 4 is provided to cover the said wire to maintain the neatness and beauty of this invention . when engaging the hollow skeleton 2 with the plate member 3 , a bevel plastic thimble 5 having a u - shaped cross - section with a concave - convex wall can be engaged firmly in the plate member inserting groove 20 as shown in fig5 . when dividing this invention into upper and lower layers , except using the quadridirectional corner connector 110 as shown in fig2 , a hooked bar element 6 can be snapped into the plate member inserting groove 20 as shown in fig7 and blocked by a stop edge 22 on the inner side of groove 20 to prevent the hooked bar 6 from coming off . since there is a bevel groove 60 on the hooked bar 6 , when the hollow 70 of central hollow skeleton 7 is engaged with the hooked bar 6 and locked with a screw 71 , the hooked bar 6 is forced outwardly to tightly clamp the plate member inserting groove 20 of hollow skeleton 2 . the top end of screw 71 is used to tighten the screw which engages at its inner end with bevel groove 60 . in addition , the upper and lower plate member inserting grooves 20 on the central hollow skeleton 7 are designed to insert the upper and lower plate members 3 therein , respectively , and plate members 3a may be laterally positioned through a stop block 72 as shown in fig5 . in consideration of arranging a slidable and openable plate member 3 , a multi - track hollow skeleton 8 can be used as shown in fig8 . the skeleton 8 is similar to the hollow skeleton 7 but has a plurality of inner and outer plate member inserting grooves 80 . when the multi - track hollow skeleton 8 is in the lower position for engagement , a groove 303 , as shown in fig2 and 33 , may be provided below stopper element 81 at the bottom of each inserting groove 80 . the width of groove 303 is such that ball elements 82 placed therein , from the front and rear ends , may slightly project through stopper 81 but cannot slip out of groove 303 , and a suitable length portion of the stopper 81 is made into a slightly downward concave form to limit the balls 82 to slide in the given range and to prevent the balls 82 from gathering toward one direction , or at some recess . therefore , when the plate members 3 of inner and outer layers move toward a single direction , an opening may be formed ; otherwise , the desk / cabinet is closed . furthermore , the multi - track central hollow skeleton 8 may replace the central hollow skeleton 7 for a compartment structure having slidably openable panels or plate members 3 above and below as shown in fig6 . a lamp shade 100 may be engaged in slot 21 as shown in fig1 and 5 for installing a lamp tube , and a stanchion 101 may engage in slot 21 , as shown in fig1 and 9 , having slots for engaging the support arm 401 ( fig1 ) for a display shelf . where the display shelves are high or heavy , as shown in fig3 a long tubular stanchion 102 may be securely fixed at its ends onto locking seat 103 for support as shown in fig1 . in order to avoid the hollow skeleton 2 being too long for lateral support and tending toward dropping down at the center thereof , a support rod 106 may be engaged between an upper holder 104 locked on the hollow skeleton 2 and a lower holder 105 locked on the plate member 3a for support as shown in fig6 . in order to further conveniently use this invention , the projecting bars 10 on the corner connector 1 may be a plurality of bars such as 3 , 4 , 5 , 6 , 7 and 8 , and the angles therebetween are not limited to 90 °. in the case of 120 °, corner connectors can be made available such as shown in fig1 and 24 . other examples of this invention are shown in fig1 and 13 , wherein an end member 24 with rack 23 may extend from the inner end surface of inserting groove 20 on one or two sides of the hollow skeleton 2 , and a row of inserting holes 25 are disposed adjacent to the end member 24 and inserting groove 20 . since the hollow skeleton 2 has the end member 24 and the support frame edge is widened , the suspension strength of plate member 3 such as glass or acrylic plate disposed in the inserting groove 20 is enhanced to make the plate member 3 more stable without moving around but with better security . an inserting groove 13 may be provided at the center of the side edge of wooden plate 12 for receiving the end member 24 at the face for bearing heavier things such as a chair or cabinet if the wooden plate 12 is inserted therein . as shown in fig1 , this invention can be arranged as a desk / cabinet in need of no 90 ° corner connector 1 through trimming the position of engagement of two hollow skeletons 2 and wooden plates 12 . as shown in fig1 and 34 , the inserting groove on wooden plate 12 may be made slightly shorter than the end member 24 , so that the wooden plate 12 is not tightly engaged against the hollow skeleton 2 when assembled , but a clearance is left therebetween , so that display shelf support arm 401 may be inserted in inserting holes 25 on the member 24 from within or without through this clearance for the purpose of expanding the display space from within or without . the aluminum - extruded hollow skeleton 2 of this invention may be made multi - directional . fig1 shows a parallel bidirectional hollow skeleton 201 and fig1 shows a parallel quadri - directional hollow skeleton 202 , so that a multi - lateral showcase and compartmented assembly may be made , as shown in fig1 for example , by using the corner connector 1 . a decorative plate member 203 may be inserted in the upper and lower ends of grooves 20 of hollow skeleton 2 respectively as shown in fig2 to cover these ends and make them more beautiful when one direction of the parallel quadri - directional hollow skeleton 202 is not used and is exposed as shown in fig1 . in addition , a compartmented assembly as shown in fig1 may be made using a skeleton pad 204 as shown in fig2 and the upper and lower support members for providing a plurality of models . the hollow skeleton 2 of this invention may be multi - angular instead of right - angular as shown in fig2 wherein it is a 112 . 5 ° skeleton 206 and in fig2 wherein it is a 157 . 5 ° skeleton 207 . a desk / cabinet with these angles can be combined as shown in fig2 through the quadri - directional corner connector 110 shown in fig2 and the tri - directional corner connector 1 similar thereto . in order to make the combination smooth and the hollow skeletons 206 , 207 even and beautiful , the quadri - directional corner connector 110 may be made with an engaging bar 111 having the same inclination as shown in fig2 in keeping with the shape of inserting holes of hollow skeletons 206 , 207 . an impact - proof rubber pad 301 may be inserted in the plate member inserting groove 20 on the hollow skeleton 2 on the two sides of a push - pull sliding glass door as shown in fig2 so as to prevent the glass from directly colliding with the hollow skeleton 2 on the two sides when opening or closing the glass , and in order to avoid the plate ( glass ) from directly contacting with the balls ( 82 ) to cause abrasion , an abrasion - resistant rubber pad 302 ( fig2 ) may be installed on the bottom end of the plate member ( glass ) as shown in fig3 . to facilitate installing various fluorescent lamp tubes having different specifications such as diameters of different sizes , which occur in different countries , an elastic clamp 304 as shown in fig3 may be inserted in the lamp shade 100 or the slot 21 wherein the fluorescent lamp tube can be clamped by the elastic member 305 on the elastic clamp 304 . a screw hole 306 may be provided of a suitable size at the bottom of slot 21 for adjusting and positioning an intermediate layer plate member 3 through locking by a screw 307 as shown in fig3 . furthermore , a light bar 309 with inserting holes 308 capable of being inserted in the plate member inserting groove 20 on the hollow skeleton 2 may be locked at the bottom of inserting groove 20 by a screw 310 in a suitable position on the light bar 309 as shown in fig3 for engaging the support arm 401 of a display shelf .
the present invention relates to a combination - type desk / cabinet compartment structure , particularly relates to various easily , simply and quickly combined display cabinets and desks with economical , beautiful and practical compartment through the multi - directional and multi - angular corner connector in keeping with the aluminum - extruded hollow skeleton and such components as plate member and glass .