the present invention is designed to provide a work station support which will allow the mounting of a shelf or shelves and / or a screen relative to a work station top . the work station top may be the top of a desk or a bench or any other flat work surface that is located and designed to provide a working environment for a worker . in fig1 the work station top 1 has associated therewith a shelf 2 and a screen 3 using the work station support according to the present invention . the work station support has two mounting brackets 4 attached to the under surface of the work station top 1 at a spaced relationship . the mounting bracket 4 is detailed in fig1 - 4 of the drawings and has a circular fixing plate 5 with an arm 6 extending centrally from the under surface thereof . the arm 6 is arranged so that in use the end or head 7 of the arm 6 protrudes beyond the edge of the work station top 1 . in use the circular fixing plate 5 of each mounting bracket 4 is fixed in a complimentary recess extending in from the under surface of the work station top 1 as will be described here below . an aperture or socket 8 is formed through the head 7 and located , when the bracket 4 is engaged in place , so that a post supported in the aperture 8 will rise substantially vertically from the work station top 1 . a face plate 9 is attached to the outer end of the head 7 . located on the outside face of the face plate 9 are two headed studs 10 which are substantially in line with the axis through the aperture 8 . the headed studs 10 are arranged to engage with apertures in the screen 3 to enable the screen 3 to be supported in a position as illustrated in fig1 . as depicted in fig2 - 4 , the circular fixing plate 5 of the mounting bracket 4 has formed therein two key hole slots or openings 11 and 12 preferably arranged diametrically opposed to each other and on a locus about the center of the plate 5 . each key hole slot 11 , 12 has a central aperture 13 with narrower extensions 14 and 15 on the locus about the center of the plate 5 and extending in either direction from the central aperture 13 . this gives an either handed operation to the brackets 4 . it is understood , however , that it would be possible within the ambit of the invention to create the mounting brackets 4 so that the key hole slots 11 , 12 function with either a left or right handed operation . also , while less convenient , the mounting bracket 4 could operate with other than a circular fixing plate 5 and with the keyhole slots 11 , 12 arranged in other than a strictly diametrical opposed configuration . on the under side of the work station top 1 is formed a circular recess 16 of a size to cooperatively receive the circular fixing plate 5 . two headed studs 17 are pre - positioned in the recess 16 and are arranged to be engaged by the key hole slots 11 , 12 in the fixing plate 5 . this means that the fixing studs 17 are located so that they do not protrude from the under surface of the work station top 1 , thereby ensuring greater convenience in handling the work station top 1 during transportation to the site for assembly . when the work station has been assembled , the two sites for the mounting brackets 4 each have fixed thereto a mounted bracket 4 by engaging the fixing plate 5 over the studs 17 and rotating the arms 6 towards each other . this operation takes advantage of the either handed operation of the key hole slots 11 , 12 in the fixing plates 5 . furthermore , this operation can quickly and easily be preformed without any tools being required and leaves the mounting brackets 4 in an engaged position extending from the work station top 1 ready to receive a screen or a shelf support frame . once the mounting brackets 4 have been fitted in place , the screen 3 can be engaged from the headed studs 10 . in this configuration , the screen 3 operates in part to retain the mounting brackets 4 in place . alternatively , as depicted in fig1 a shelf support 30 can be engaged with the arms 6 and will also serve the same function . clearly , as illustrated in fig1 both the screen 3 and shelf support 30 can , if desired , be fitted at the same time . the shelf support 30 is illustrated in fig5 and comprises two posts 18 each having a lower end 19 of reduced diameter to engage through the aperture 8 of mounting brackets 4 . in the illustrated preferred example , shelf support 30 is provided with two arms 20 , one extending from each post 18 . the two arms 20 are joined together by a connecting brace 21 extending therebetween . as a result of connecting brace 21 , when the posts 18 are engaged in apertures 8 of the mounting brackets 4 , the mounting brackets 4 are not free to rotate and hence are locked in position . that is , connecting brace 21 prevents the rotation of mounting brackets 4 is opposite directions . the shelf 2 is configured for mounting on shelf support 30 . specifically , the under surface of shelf 2 has complimentary grooves 22 into which will fit the arms 20 and a groove 23 into which the connecting brace 21 will engage . the connection between shelf 2 and shelf support 30 may be affected by any suitable fastening means but preferably it has been found desirable to fix the shelf 2 in place by using an adhesive to retain the arms 20 and brace 21 in their respective grooves . within the ambit of the invention it would be possible to have a different shelf support to hold the shelf 2 . it would be desirable , however , to ensure that once the posts 18 of the shelf support are in position , there is a locking action to retain the mounting brackets 4 in position in case this function was not fulfilled by the screen 3 . the manner in which the shelf 2 is connected to the posts 18 could utilize any of the numerous means of allowing detachable attachment of shelves to the posts . for convenient operation at a work station , one of the requirements is to retain in a tidy manner the material stored on the shelf 2 . as depicted in fig5 the present invention addresses this requirement by providing a back rail 25 extending through an aperture 24 appropriately positioned towards the top of each post 18 . the top of each post 18 preferably includes a threaded aperture 32 into which a threaded stem 34 of a top 26 may engage . when stem 34 is received within aperture 32 , stem 34 engages against back rail 25 so as to lock or retain the back rail 25 in position . the back rail 25 provides a back stop for articles on the shelf 2 but also , more importantly , ensures a support for retaining arms that can be used to retain articles on the shelf 2 . a retaining arm 36 is illustrated in fig7 and 8 of the drawings . two such retaining arms 36 are provided in an opposite handed relationship on the back rail 25 . the back rail 25 and retaining arms 36 could be dispatched separately and could be assembled on site without requiring any tools for such fitting . each retaining arm 36 comprises a bush 29 having a slidable fit on the rail 25 . an arm 27 is shaped to extend up and away from the bush 29 effectively parallel with the rail 25 . the arm 27 then continues as an arc or suitably shaped end 28 to act as a holder or stop . any force against the section 28 of the arm will tilt the bush 29 causing it to engage or lock on the rail 25 , thus effecting the retaining action required . by a suitable pressure to relocate the bush 29 , the retaining arm 36 can be located so that the bush 29 can freely slide along the rail 25 . in this way a convenient retaining means is formed on the back rail 25 to be used in association with the shelf 2 . the present invention desirably encapsulates the advantages for the work station support provided by the mounting bracket 4 and the shelf support 30 but an effective support could be achieved using a fixing plate which is fixed by more conventional fastenings such as by screws into the under surface of the work station top 1 while still preserving the remaining features of the present invention as disclosed and it is intended that this should be incorporated within the ambit of the present invention . as stated above the screen 3 can be fitted separately or it may be included with the shelf support 30 . in many instances it will be desirable for a screen to be fitted by itself . where the screen 3 is supplied , it is desirable to ensure that there is a degree of height adjustability . this can be achieved by providing a plurality of apertures and vertical rows spaced to correspond with the location of the studs 10 on the face plate 9 of the fixed mounting brackets 4 . the screen 3 can be of any convenient material . preferably a perforated metal screen is both aesthetically pleasing and convenient for fitting in position to retain the mounting brackets 4 in place . selecting the appropriate apertures to determine the height of the screen 3 allows the screen 3 to be fitted by engaging the screen apertures over the head of the stud 10 and allowing the screen 3 to drop into the supported position . the screen 3 can assume the peripheral shape of the work station periphery allowing for a flexibility in design that is desirable in the modern working environment the present invention thus has a number of advantages in establishing a modern and conveniently adjustable work station support for a shelf or shelves or a screen associated with a work station top in an office or office type environment .
a work station support comprises two mounting brackets arranged in use to be attached to a work station top at a spaced relationship . each mounting bracket has a fixing plate and an arm extending from said fixing plate . two separate key hole slots are formed on each fixing plate at a locus about a center of rotation of the fixing plate . the key hole slots are formed to engage studs projecting from the table top when the fixing plates are rotated in opposite directions . a post upwardly extends from each mounting bracket . outwardly projecting from the top end of each post is an arm . a shelf is supported on and extends between the arms . a rail also extends between the posts and functions as a back stop for the shelf . a retainer is slidably mounted on the rail and partially extends across the shelf .