fig1 and 2 show respectively a front and rear view of my adjustable portable exercise desk . it will be seen to include two parallel sides and a back joined to these sides by three hinges 12 . fig3 further shows the construction of the desk sides and back . each side consists of a large rectangular element 14 , which in a preferred embodiment is assembled from vertical and horizontal rails . this large rectangular element is permanently joined at right angles along a vertical edge to a small strip - like rectangular element 16 , which is hinged to one - half of the desk back . the desk back comprises two mirror - image sections , each of which consists of a horizontal top member 18 which is reinforced by an angular brace 20 , the vertical leg of which is hinged to the desk side . the horizontal top members of the respective sides of the desk are hinged to each other along their rear medial vertical edges 22 and secured by a latch 24 spanning their front medial vertical edges . the desk will be seen to include a worksurface 26 which has protrusion 28 that project from the bottom of each end and fit onto one of several sets of support rails 30 . the rails are secured to the desk sides by screws 32 which traverse holes that line the desk sides at regular intervals 34 . the worksurface is further provided with hand - hold cutouts 36 to allow for easy repositioning . one side of the desk is equipped with four roller catches 40 which line up with mating catch pieces on the underside of the worksurface 42 so it may be secured to the desk side for transport and storage . the desk also has a set of handles 44 so it may be easily carried when collapsed . fig4 ( a ) shows the top of the worksurface 26 in greater detail , and fig4 ( b ) shows the underside of the worksurface with attention to the four mating catch pieces 42 previously mentioned . fig5 shows how the protrusions 28 on the ends of the worksurface fit into the approximately quarter - round beveled sections 46 of the worksurface support rails . thus the worksurface acts to connect and stabilize the two sides of the desk while permitting the user to change the height of the worksurface by simply lifting or sliding it off the support rails . fig6 shows how the rails 30 are secured to the desk side with screws 32 at any desired height . in a preferred embodiment the desk is provided with four sets of rails , however , a greater or lesser number may be utilized . fig7 shows the desk with the worksurface secured to its side . fig8 shows the medial latch 26 unfastened and the desk in a semi - collasped position . fig9 shows the desk in a fully collapsed position , and fig1 shows it being carried in this position by the handles . fig1 shows the desk being used with the worksurface positioned on a low set of rails for sitting on a floor cushion . fig1 shows the worksurface at conventional desk height being used with a kneeling chair . fig1 shows the user midway in the process of changing the height of the worksurface from a sitting to a standing height . note that it is not necessary to remove the computer from the worksurface during this procedure . fig1 shows the worksurface positioned on rails so it may be comfortably used at standing height . fig1 and 16 show the worksurface positioned at its greatest height so a user may pedal a stationary bicycle or walk on a treadmil concomitantly with working . it will be noted that the exercise machines fit readily under the relatively open back of the desk . in a preferred embodiment , the portable adjustable exercise desk is approximately 48 &# 34 ; high , 32 &# 34 ; wide , and 16 &# 34 ; deep ; dimensions that conform to utility and comfort when using a notebook computer ; the desk may , however , be of other dimensions . in a preferred embodiment , the sides and back of the desk are constructed of oak or other hardwood , and the worksurface is constructed of reinforced hollow - core hardwood - laminate veneer , so as to minimize its weight and provide for its easy repositioning at different heights . in the above - described embodiment , the entire desk with worksurface weighs about twenty pounds , however , for additional lightness , aesthetics or utility , the desk may be also be constructed from materials other than wood , such as metals or plastics , or combinations thereof . although the description above contains many specificities , these should not be construed as limiting the scope of my invention but as merely providing illustration of some of its present preferred embodiments and uses . other embodiments and users are contemplated , for example , in its above described or somewhat modified form my invention may also be used as a shelving and / or storage system , a reading desk , a display module , a speaker &# 39 ; s stand , a food or drink bar , and in a variety of other useful ways . thus the scope of my invention should be determined by the appended claims and their legal equivalents , rather than by the examples given .
a collapsible desk with unique height adjustment features which allow users to change positions frequently and exercise while they work . the desk may also be used for a variety of other purposes .