the invention provides a wall panel which may be assembled by mounting one or more modules to a wall . fig1 shows a wall panel module 20 according to the invention . module 20 comprises a generally planar front surface 24 . front surface 24 is divided into a regular array of rectangular segments 26 by intersecting grooves 30 , 32 . preferably the spacing between grooves 32 is the same as the spacing between grooves 30 and segments 26 are generally square . grooves 30 intersect grooves 32 at an angle θ . in fig1 grooves 32 are perpendicular to grooves 32 and θ is a right angle . the corners 34 , 36 , between segments 26 and grooves 30 , 32 are preferably rounded for ease of insertion of accessories 40 and because rounded corners have a pleasing appearance . grooves 30 , 32 are preferably uniformly spaced and penetrate substantially entirely through module 20 . preferably grooves 30 , 32 all have the same depth . for retail display applications , grooves 30 , 32 are typically between approximately 5 cm and 8 cm apart and between approximately 2 cm to 6 cm deep and are preferably between 2 . 5 cm and 4 cm deep . in general , increasing the dimensions of module 20 by increasing the spacing between grooves 30 , and 32 , increasing the depth of grooves 30 and 32 and increasing the thickness of the material from which module 20 is made tends to increase the load which can be supported by an accessory attached to panel 20 . panels 20 may be made in any convenient size . for example , approximately 60 cm by 120 cm is a convenient size for transporting and installing panels 20 . panels 20 may be conveniently manufactured by vacuum - forming a suitable plastic , such as the 0 . 45 cm thick general purpose abs plastic sheet which is available from basf corporation , plastic materials div ., of parsippany , n . j . or monsanto company , of st . louis , mo ., into a female mould . fig2 shows an accessory 40 about to be inserted into a module 20 which has been affixed to a wall 42 . accessory 40 comprises a hook 43 and a mounting end 44 . mounting end 44 comprises a first planar member 46 and a second planar member 48 which is mounted at an angle θ to planar member 46 . in module 20 θ is 90 degrees so planar members 46 and 48 intersect each other at a fight angle . as shown in fig2 and 4 , accessory 40 is mounted to module 20 by aligning planar member 46 with a groove 30 , aligning planar member 48 with a groove 32 and pushing planar members 46 and 48 until they are frilly inserted in grooves 30 and 32 respectively . after accessory 40 has been mounted ( fig4 ), hook 43 is left projecting from module 20 . as is described more fully below with respect to fig5 and 6 , planar members 46 and 48 are held in place in grooves 30 and 32 by friction between the faces of planar members 46 and 48 and the walls of grooves 30 and 32 . layers 50 of friction material , such as friction tape , may be applied to the faces of planar members 46 , 48 to increase the frictional force resisting the withdrawal of accessory 40 from module 20 . 3m ™ part number 8562 clear urethane abrasion resistant tape is a suitable material for layers 50 . preferably layers 50 cover as much of the surfaces of planar members 46 , 48 that contact the walls of grooves 30 , 32 as possible . as an alternative to using friction tape for layers 50 , layers 50 may be integral with accessories 40 . for example , fig3 shows a shelf , 52 , having a body 51 extruded from rigid pvc plastic . layer 50a on shelf 52 is a thin layer of flexible pvc plastic which has been co - extruded with body 51 . layer 50a may be , for example , approximately 0 . 05 cm ( 0 . 02 inches ) thick . layer 50a may extend over one or more faces of the portion of shelf 52 which fits into grooves 30 , 32 . as shown in fig4 a flat shelf 52 or a divider 54 may be mounted to module 20 by inserting an edge of the shelf or divider into one of grooves 30 , 32 . once inserted , the shelf or divider is held in place by friction between the walls of the groove and the faces of the divider or shelf . ribs 56 may be provided on a divider 54 or shelf 52 to further prevent the divider or shelf from sliding along the groove in which it is mounted . vertical grooves 32 allow accessories such as divider 54 or vertical signs ( not shown ) to be easily and directly mounted to module 20 . this is in contrast to slot wall systems in which it is difficult to mount vertical accessories . fig5 and 6 show the construction of grooves 30 and planar members 46 in detail . it is to be understood that grooves 32 and planar members 48 interact in an manner analogous to the interaction of grooves 30 and planar members 46 . as shown in fig6 planar member 46 has a tight interference fit in groove 30 . grooves 30 have generally parallel walls 60 and 62 . the width , w , of groove 30 is slightly less than the thickness , t , of planar member 46 . for example , when w is 0 . 46 cm ( 0 . 18 inches ) and modules 20 are constructed as described above , then t is preferably approximately 0 . 48 cm ( 0 . 188 inches ). when accessory 40 is mounted to module 20 , planar member 46 is forced into groove 30 as indicated by arrow 63 . during this process , walls 60 and 62 of groove 30 are forced slightly away from each other by the passage of planar member 46 . rounded corners 65 help to guide planar member 46 into slot 30 . walls 60 and 62 are resilient . when walls 60 and 62 are moved apart by the introduction of planar member 46 they subject planar member 46 to restoring forces as indicated by arrows f in fig6 . these forces squeeze planar member 46 and tend to increase the frictional force between the faces of planar member 46 and walls 60 , 62 . for a groove of width w the thickness t of planar member 46 is limited by the degree to which walls 60 and 62 of groove 30 may be forced apart without becoming non - parallel . if planar member 46 is too thick for a groove 30 then inserting planar member 46 in groove 30 may wedge walls 60 , 62 apart at an angle . then , only the innermost portion of planar member 46 will be in contact with walls 60 , 62 and planar member 46 will not be firmly retained in slot 30 . for maximum strength , when planar member 46 is fully inserted in slot 30 , walls 60 and 62 should be parallel and in flat forceful contact with opposing sides of planar member 46 . for a given slot 30 , to obtain maximum holding force , planar member 46 is preferably as thick as possible without making walls 60 and 62 non - parallel when planar member 46 is inserted into slot 30 . if module 20 is vacuum formed , as described above , then front face 24 and the walls 60 , 62 of grooves 30 , 32 are formed from a single unitary sheet 66 of material . grooves 30 , 32 comprise indentations in sheet 66 . the resiliency of walls 60 and 62 depends upon resiliency of the material from which they are formed and , to some degree upon the shape of grooves 30 . the corners 65 formed between walls 60 and 62 and front face 24 are rounded and preferably have a radius of curvature on the order of 0 . 32 cm ( 0 . 125 inches ). voids 64 may optionally be filled with a resilient foam material to enhance the resiliency of walls 60 and 62 . as an alternative to vacuum forming , module 20 may be made by injection moulding a resilient plastic material or by moulding a resilient foamed plastic or rubber material . as shown in fig5 module 20 may be affixed to a wall by passing screws 70 through the rear walls 72 of grooves 30 and 32 . the screws are hidden from sight and so do not detract from the appearance of module 20 . preferably the width w of grooves 30 and 32 is large enough that a mounting screw 70 may be easily installed at the junction of a groove 30 and a groove 32 and small enough that screw 70 is reasonably well hidden from view when the installation is complete . preferably the radius of curvature of the corners formed at the intersections of grooves 30 and 32 by walls 60 , 62 of grooves 30 and the walls of grooves 32 is on the order of 0 . 38 cm ( 0 . 15 inches ). this radius and the widths of grooves 30 , 32 together define the maximum size of screw head that can be inserted at the intersections of grooves 30 and 32 . v - shaped notches 74 may be provided in the centres of rear walls 72 to assist in placing screws 70 and to act as guides for cutting modules 20 to size with a knife . as shown in fig5 notches 74 are preferably v - shaped notches formed by two planar surfaces 74a which have a dihedral angle of approximately 90 degrees . preferably surfaces 74a extend the full width of the forward faces of rear walls 72 . the mounting edges of planar members 46 , 48 ( or the mounting edges of shelves or other accessories to be inserted into grooves 30 , 32 ) may be bevelled for easy insertion . screwing module 20 to a wall increases the rigidity of module 20 and , consequently , increases the weight bearing capacity of accessories mounted to module 20 . generally , the more points of attachment there are between module 20 and a wall the more rigid is the resulting wall panel and the greater is the holding strength . the holding strength of module 20 is maximized when module 20 is affixed to a rigid wall with a suitable adhesive and / or a large number of closely spaced mounting screws 70 . because module 20 is reinforced by the wall to which it is attached it is possible to provide a display panel according to the invention which is durable and strong when installed , and yet is considerably lighter in weight than a slot wall panel , with correspondingly lower shipping costs , and correspondingly easier handling and installation . as shown in fig7 a backing sheet 75 , such as a sheet of abs plastic on the order of approximately 0 . 15 cm to 0 . 3 cm ( 0 . 06 inches to 0 . 125 inches ) thick may be bonded to the rear surface of a module 20 to increase the rigidity of module 20 . with a sufficiently rigid backing sheet 75 , module 20 may be used in free - standing applications such as in an office divider or a free - standing display unit . several modules 20 may be affixed to a wall next to each other to cover a large area . as shown in fig1 modules 20 have a rim 76 projecting in a flange - like fashion from their rear edges . rim 76 is one half of the width of grooves 30 and 32 , so that when two modules 20 are butted against each other a groove having the same dimensions of grooves 30 , 32 is formed between the two modules 20 . the seam between adjacent modules 20 is thereby hidden at the bottom of a groove and the groove formed between the adjacent modules may be used in the same manner as other ones of grooves 30 , and 32 . it is convenient to make rim 76 have the same profile in cross section as one half of a rear wall of grooves 30 , 32 . where the wall surface to be covered with modules 20 is an odd size , modules 20 may be trimmed to fit , simply by cutting along the centre of one of grooves 30 or 32 with a hand held knife . unlike slot - wall panels , modules 20 are omni - directional . the module 20 , shown in fig1 will function identically in any orientation turned through any multiple of 90 degrees from an initial orientation . because modules 20 , or portions of modules 20 , can be combined to cover a large area without leaving any unsightly seams the problem of wasting panel parts which are left over after an installation is virtually eliminated . such left over parts can be easily re - used . even a portion of a module 20 as small as two segments 26 wide by two segments high , may be installed and used . as shown in fig4 a flat shelf 52 of suitable thickness may be simply inserted into horizontal grooves 30 in a module 20 . flat shelves 52 are suitable for bearing light weight objects . fig8 shows an alternative shelf 80 which may be mounted to module 20 of fig1 for bearing heavier loads . shelf 80 is mounted to a module 20 by inserting mounting edge 81 into a horizontal groove 30 . as described above with reference to planar member 46 , mounting edge 81 fits into a groove 30 with an interference fit . shelf 80 has vertical supports 82 projecting from its underside . vertical supports 82 are spaced apart by a distance d which is equal to a multiple of the spacing of vertical grooves 32 in module 20 . vertical supports 82 fit into vertical grooves 32 of module 20 with an interference fit . to further increase the resistance of shelf 80 to pulling out from module 20 strips 84 of friction tape may be provided on one or both sides of the mounting edge of shelf 80 . accessories , such as shelf 80 , may optionally be equipped with mechanical fasteners 86 to further enhance the resistance of such accessories to pulling out from module 20 . fasteners 86 may be , for example , rubber expansion bolts which can be tightened after the accessory has been mounted to module 20 . when they are tightened , fasteners 86 expand against the sides of grooves 30 or 32 to hold the accessory in place on a module 20 with a tight friction grip . fig9 shows an alternative module 90 according to the invention . in addition to vertical grooves 32 and horizontal grooves 30 , module 90 has diagonal grooves 92 , 94 . diagonal grooves 92 , and 94 allow accessories to be mounted to module 90 at an angle and provide an alternative appearance . fig1 shows a further alternative module 95 and an accessory 96 for use with module 95 . module 95 has three sets of grooves 97 , 98 , and 99 . grooves 97 , 98 , and 99 are all at an angle of 60 degrees to one another . module 95 is symmetrical with respect to rotations through any multiple of 60 degrees . as will be apparent to those skilled in the art in the light of the foregoing disclosure , many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof . accordingly , the scope of the invention is to be construed in accordance with the substance defined by the following claims .
a display wall system is disclosed . the system is suitable for use in displaying items and can be quickly reconfigured . the system includes modules which can be affixed to a wall to form wall panels , and accessories such as shelves , hooks , dividers , and hangers which may be mounted to the wall panels . the wall panels have a generally flat front face and a grid of intersecting grooves in the front face . the grooves have generally parallel walls extending generally perpendicular to the front face of the panel . accessories for mounting to the panel have a mounting end bearing one or more planar members which can be pushed into the grooves where they are held by friction . the planar members are somewhat thicker than the grooves are wide so that the planar members fit in the grooves with a tight interference fit . the components of the system are light in weight , durable , simple to install and can be installed with minimal waste . the resulting wall panel display system is attractive to the eye and does not have any visible seams .