in this invention we use various folding mechanisms to implement a number of concepts for reducing the volume of a tv during transport . several different embodiments are described here with variations on each of the embodiments . fig1 is a perspective view of one embodiment of the system as used in the rear projection ( rp ) mode . in this embodiment a main cabinet 1 , supports the viewing screen 2 , two speakers 3 , and 4 near the lower front comers , and a door 5 , in the center of the front face of the cabinet to provide access to the interior of the cabinet for removal and / or adjustment of the projector and internal optical and electronic components . all these items may be detachable for use in a front projection ( fp ) mode . the sides 6 , and 7 , of the enclosure are pleated and attached to the sloping part of the rear section 9 by means of sliding fasteners in a groove at the sides of the sloping rear section . as the sloping section folds downward the pleats compress and slide forward in the grooves until the rear sloping section reaches a limit somewhat before the vertical position . this limit is the point where the pleated sections are fully compressed and the sliding fasteners in the upper groove are touching one another . fig2 shows an arrangement where the projector and speakers have been removed from the system and used as a conventional front projection ( fp ) system . the screen in this embodiment has been removed from the set and used in a standard arrangement , for example at the front of a meeting room . using the screen from the rp set has the further advantage that it can also be illuminated from the rear as in the rp mode . when used in the fp mode , the speakers may be easily removed by simply pulling forward which disengages the electrical connectors , for example a standard type of slot connector , within the enclosure . thus the speakers are available for use with the system in the fp mode using separate extension cables that mate with the connectors on the speakers and the projector . fig3 is an exploded view of the above embodiment of the system showing the pleated side sections , the viewing screen , the speakers , the projector and the projector holder disengaged from the system . in fig4 the projector and screen have been replaced back into the set for rp operation . optical paths identical to those in the fp mode may be maintained within the cabinet , resulting in the same quality picture in either mode . fig4 further identifies the folding floor or bottom sections of the cabinet , 22 and 23 hinged to permit folding of the set . fig5 is a cross sectional side view of an embodiment of the system arranged for television viewing in the rp mode . internal to the cabinet are the components that make up the optical , electronic , and possibly , other parts of the system . the main projector 11 , is removable from the front of the cabinet . it mounts on a fixed carrier 15 , that locks into position and holds the projector rigidly in place in the configuration shown in fig5 . the television beam is reflected by a single mirror 13 , to the rear side of the viewing screen 2 . in another arrangement , a second mirror may be added and the projector operated facing downward to increase the optical path length and further reduce the system bulk . such an arrangement is shown in fig6 . in the embodiment shown in fig6 , the cabinet or frame comprises seven sections , a main cabinet 1 , two flexible side sections 6 , and 7 ( not visible in the cross section ), a vertical rear section 8 , a sloping rear section 9 , and two bottom or floor sections , 22 and 23 . the rigid main cabinet 1 , makes up the front face and serves as the carrier , a sort of box for the rest of the system as the system is folded into a compact unit within and / or against the main cabinet 1 . the two sides , 6 and 7 , are bellows - like structures in this embodiment that compress with the folding down of sloping rear section 9 , to which they are slideably connected at the top . the rear vertical section 8 , is made up of a lower rigid part and an upper bellows part as shown in the rear view , fig7 . the rear sloping section 9 , supports mirror 13 , on its inside and is itself a rigid structure . this rear sloping section is attached to a set of telescoping tubes 24 , one on the inside of each rear corner of the section to maintain the alignment and rigidity of the system during the folding operation . the bottom section or floor is made up of two pieces 22 , and 23 that are hinged to each other and to the front and rear sections of the system as was shown in fig4 . the system is folded by first releasing all the latching fasteners 21 of fig7 , ( after removing the projector and any other detachable items ) then lifting upward at the hinged joint joining rigid bottom sections 22 and 23 while pressing downward on the rear sloping section 9 . as the folding proceeds , the telescoping tubes 23 guide the rear sloping section 9 until it reaches the rigid lower part of rear section 8 at this point the folding process is complete and the cabinet is in the fully compacted position shown in fig9 . fig1 shows another embodiment of the system as used in rp mode . this embodiment comprises a multi - piece cabinet made up of seven sections to house the components . section 1 is the base cabinet to which the other components attach directly or indirectly . sections 6 and 7 make up the sides of the system cabinet pleated as in the previous embodiment . the vertical rear section 8 , instead of the being partly pleated , it is one regid section , folding proceeds in a way similar to the previous embodiment but sloping rear section 9 , slides downward inside and contacting the rigid rear section 8 on either side by means of slideable attachments in a groove in rear section 8 . rigid vertical rear section 8 is attached hingeably to bottom sections 22 and 23 . sloping rear section 9 completes the closure of the structure , being hingably attached to the base cabinet 1 at the top of the system , and slideably attached to the vertical rear section 8 . bottom sections 22 and 23 , are hingeably attached to each other and to the base cabinet 1 , at the front of the set , as well as to the rear vertical section 8 in this embodiment , folding proceeds as follows : after opening its removal doorway 5 , projector 11 , is electrically disconnected , disengaged from its support and removed from the system by pulling forward . after removal of the projector , any additional removable components may be removed through the opening where the projector previously resided . at this point , a slight lifting on the bottom sections 22 and 23 at the point where they are hingeably connected will start the folding operation . simultaneously , a downward pressure on rear sloping section 9 allows it to slide downward while remaining connected to rear section 8 by means of sliding members in a groove . this process is shown in fig8 where the system is partly folded . as the folding process proceeds , an optical component , said mirror 13 , swings forward while remaining attached to rear sloping section 9 . after being fully folded , the system appears as shown in fig1 . a latching mechanism is provided to lock the system together in the fully folded position where it may be handled easily and carried in any position . details of the folding sides in a third embodiment is shown in fig1 as a variation of the first embodiment . in this version , the sides of the cabinet 6 and 7 are rigid and hingeably attached to the main cabinet section 1 at a point far enough rearward that these sides fold inward into the base cabinet 1 . a latching mechanism then binds the entire system together in a compact bundle . this same hinged rigid side arrangement may also be applied to either of the embodiments previously discussed . the screen itself , although appearing herein to be a rigid structure , may actually be made of a flexible material and designed to fold or roll up for storage or transport , or used separately for another purpose . after removing the projector from the cabinet , the projector becomes a free - standing unit and may be used as a front projection assembly with a separate screen or the screen removed from the foldable tv set . thus , the use of a standard projector in this system adds a great deal to its versatility . although three embodiments of the system with variations have been shown in some detail here , other modifications based on these principles will undoubtedly occur to one skilled in the art . the particular details presented here are not intended to limit the invention to these embodiments , but to show some applications of the principle of folding to achieve a compact transportable unit . the invention is intended to encompass all embodiments that employ the same basic principles .