EQUIPMENT ENCLOSURE

Abstract: An equipment enclosure comprises a frame (10) together with a top panel (22), two side panels (16) and front (58) and rear (60) panels together with front base (40) and rear base panels(44). The side panels (16) are held using studs (18) in recesses (20) in the frame (10). The top cover (22) rests on a top face (24) of the frame (10) initially by gravity and engages the studs (18) to position the side panels (16) relative to the frame (10). Front (58) and rear (60) panels are then affixed respectively to a front edge (54) and a rear edge (56) of the top panel and affixed at their respective lower ends (76) using the front base panel (40) and the rear base panel (44). The tolerances are such that outside dimensions of the enclosure are entirely defined by the mutual engagement between the panels (58, 60, 40, 44, 16, 22) and the frame (10) can occupy a range of positions within the completed enclosure.

Description: The present invention relates to an enclosure for electronic, data processing and other housed equipment wherein a number of covers or panels are assembled onto a frame. It is usual to provide electronic and other equipment mounted in a support frame. The frame is then surrounded by panels to provide an enclosure. Where the equipment is small the frame, which is usually made of metal, can be made to fairly precise dimensions. There is then no difficulty in fitting panels around the frame. As the equipment becomes larger so the dimensions of the frame become less accurate and tolerance errors between mounting points on the panel and mounting points on the frame mean that it is often necessary to provide instant modification to either the panel or the frame before the panels can be mounted upon the frame to make the enclosure. It is known in the Art to cause the frame itself to be an exposed part of the enclosure and to apply panels to open portions thereof. This increases the cost of the frame by adding a requirement for cosmetic acceptability and allows direct electrical access to the equipment in its frame which causes problems with electrostatic discharge and radio interference. The present invention consists in an equipment enclosure comprising: a support frame; a side panel for attachment to a top edge of a side face of said frame to cover said side face; a top panel for covering a top face of said frame with a front edge of said top panel in proximity with a top edge of a front face of said frame and a rear edge of said top panel in proximity with a top edge of a rear face of said frame; a front panel for attachment to said front face of said frame and for attachment to said top panel at said front edge; and a rear panel for attachment to said rear face of said frame and for attachment to said top panel at said rear edge; said front panel and said rear panel being co-operative with said top panel to hold said top panel onto said frame; and said top panel being co-operative with said top edge of said side face of said frame to prevent removal of said side panel from said frame. An equipment enclosure according to the present invention is made where tolerance build up on the frame does not prevent mounting of the panels. The outer dimensions of the case or enclosure are determined by the interaction between the panels rather than by the interaction between each panel and its mounting point on the frame. It is a preferred feature of the present invention that all panels further be in contact with the frame by means of elastic members such as gaskets allowing further movement between the panel and the frame whilst maintaining mechanical contact. In the preferred embodiment of the invention hereinafter described the frame has a pair of side panels mounted on catches which allow those side panels a degree of freedom of movement relative to the frame. A top panel is rested upon a top face of the frame and the side panels contact the edges of the top panel to define the width of the enclosure. Thereafter front and rear panels are attached firstly to front and rear edges of the top panel and then to the frame. In the preferred embodiment the front and rear panels are attached to the frame by means respectively of front and rear based panels which engage a lower edge respectively of the front and rear panels and are in turn attached to the frame by a releasable locking mechanism. In the preferred embodiment the top panel can thus have dimensional tolerance with respect to the frame in a forward and backward direction as well as in a side-to-side direction. The invention is further explained, by way of an example, by the following description read in conjunction with the appended drawings, in which: FIG.1 shows an exploded projected view of an equipment enclosure according to the present invention with all except the front and rear panels present. FIG.2 shows an example of a catch suitable for attaching the side panels of FIG.1 to the frame of FIG.1. FIG.3 shows the elements of FIG.1 assembled and further shows the manner of addition of the front and rear panels. FIG.4 shows the manner in which the front or rear panel comes together with the top panel along its front or rear edge. FIG.5 shows the manner in which the top panel and the side panels engage the frame and one another. FIG.6 shows the manner in which either the front or rear panel and the front or rear base panel of the enclosure are brought together to complete assembly of the enclosure; and FIG.7 shows the elements of FIG.6 in the finally assembled position. FIG.1 shows an exploded view of a preferred embodiment of an equipment enclosure according to the present invention lacking only front and rear panels. A frame 10 is fitted on either side with a side base panel 12 at the lower edge of a side face generally indicated by 14. A side panel 16 is provided to cover each side face 14 of the frame 10. The side panels 16 are provided with studs 18 for fitting into complementary recesses 20 in the open framework of the frame 10. Whilst in the preferred embodiment there are shown to be four such studs 18 and recesses 20 associated with each side face 14 of the frame 10 it is to be appreciated that fewer or more than four studs can be so used. A top panel 22 sits upon a top face 24 of the frame 10. Cut-away portions 26 on a side edge 28 of the top panel 22 straddle the studs 18 when the enclosure is assembled in a manner later described in relation to FIG.2 to allow movement of the side panels 16 in a direction towards and away from the side faces 14 of the frame 10. The side edge 28 of the top panel 22 when the enclosure is assembled projects down between the top side edges 30 of the frame 10 and the side panels 16. The side edges 28 of the top panel 22 are given a generally tapered outline in cross section with increasing thickness with increasing height and there is one side edge 28 to the top panel 22 on either side of the frame 10. The side edges 28 therefore overhang the frame 10 when the top panel 22 is in place. Referring to FIG.2, which shows a stud and recess suitable for use in the invention, the stud 18 comprises a head 32 on a shank 34. The side top edge 30 of the frame 10 which is generally reconstructed from bent steel sheet has the recess 20 set into the top side edge 30. The recess comprises a recess opening 36 designed to accept and roughly centralise the head 32 of the stud 18. A channel 38 in the lower half of the recess 20 accepts the shank 34 of the stud 18 and allows that the shank is free to move over a range of positions within the channel 38. While the head 32 of the stud 18 is shown in this example as being of triangular outline it is to be appreciated that many other shapes will work. In general terms a circular or rectangular head 32 may be provided. Likewise the opening 36 to the recess 20 may be made wider than the head 32 of the stud 18 to accommodate a degree of mismatching between the position of the stud 18 on the side panel 16 and the position of the recess 20 on the frame 10. Similarly the channel 38 can be made much wider than the shank 34 of the stud 18 again to accommodate such mismatching. When the top panel 22 is in position the cut-away portions 26 pass around the shank 34 of the stud 18 to define the position of the side panel 16 in relation to the top panel 22 without reference to the position of the frame 10. Returning to FIG.1, a front base panel 40 is applied to a bottom edge of a front face 42 of the frame 10 and a rear base panel 44 is applied to the bottom edge of a rear face 46 of the frame 10, each in a manner later to be described. In assembly the side panels 16 are first applied with the studs 18 in the recesses 20 loosely held against the side face 14 of the frame 10. The top panel 22 is then placed upon the top face 24 of the frame 10 and remains there under the influence of gravity. In being placed upon the top face 24 the side edges 28 of the top panel 22 pass between upper edge portions 48 of the side panel 16 and the top side edges 30 of the frame 10 to move the side panel 16 away from the side faces 14 of the frame 10 until the top panel 22 has settled down on the top face 24 of the frame 10 with one of the side edges 28 of the top panel 22 on either side of the top side edges 30 of the frame 10. The wedge shape of the side edges 28 of the top panel 22 ensures a snug fit no matter what the dimensional tolerances of the frame 10. The cut-away portions 26 in the top panel 22 engage the shanks 34 of the studs 18 in the side panels 16 and thus cause the side panels 16 to move such that the shanks 34 of the stud 18 become centralised in the cut-away portions 26 of the top panel 22. Thus the side panel 16 and the top panel 22 move into a mutually correct positional relationship despite any mechanical tolerances present upon the frame 10. When the enclosure has the side panel 16 thus in place a front edge portion 50 of each side panel 16 extends beyond the front face 42 of the frame 10 and a rear edge portion 52 of each side panel 16 extends beyond the rear face 46 of the frame 10. When the top panel 22 is in place over the top face 24 of the frame 10 a front edge 54 of the top panel 22 overhangs the front face 42 of the frame 10 and a rear edge 56 of the top panel 22 overhangs and extends beyond the rear face 46 of the frame 10. The frame 10 whilst here described as being generally constructed of bent sheet metal, can equally well be made from solid metal or plastics or any other materials. FIG.3 shows the elements of FIG.1 assembled onto the frame 10 as described and further shows a front panel 58 and a rear panel 60 ready for placement. The top panel 22 traps the studs 18 in the recesses 20 and prevents removal of the side panel 16 whilst the top panel 22 is in place. The front panel 58 and the rear panel 60 each comprise arms 62,64,66. The arms 62 are provided on either side of the front 58 and rear 60 panels and fit into a gap 68 between the front edge 54 of the top panel 22 and the front edge portions 50 of the side panel 16. The arms 62 together with a staircase structure later to be described with reference to FIG.4 together hold the front panel 58 onto the front edge 54 of the top panel 22. The rear panel 60 is similarly attached to the rear face 46 of the frame 10 by attachment to the rear edge 56 of the top panel 22. When in place the upper surface of the top panel 22 is substantially at the same level as the uppermost part of the top edge portion 48 of each side panel 16. Likewise it is intended that the outer surface 58 of each of the front 58 and rear 60 panels should be substantially level with the most extreme part respectively of each of the front edge portions 50 and rear edge portions 52 of the side panels 16. FIG.4 shows the manner in which the front panel 58 joins with the top panel 22 along the front edge 54 of the top panel 22. The view shown is a cross sectional view. The top panel 22 at its front edge 54 is provided with a tip portion 70 which engages a complementary tip portion 72 of the front panel 58. The tip portion 70 of the top panel 22 comprises a staircase structure at its extreme end which engages a complementary staircase structure at the extreme end of the tip portion 72 of the front panel 58 in such a manner that the top panel 22 provides mechanical support to the front panel 58. The combined action of the arms 62 upon ledges or pivots beneath the top cover 22 and the mutually engaging staircase structures in the tip portion 70 of the top panel 22 and the tip portion 72 of the front panel 58 serves to provide a firm support for the front panel 58 on the front edge 54 of the top panel 22 without the front panel 58 being directly attached to the frame 10. The position of the front panel 58 with respect to the front face 42 of the frame 10 is thus defined by the position of the front edge 54 of the top panel 22. The rear panel 60 is attached to the rear edge 56 of the top panel 22 in a similar manner. A sealing gasket 74 in the form of a thin rubber or elastic cylindrical body of material is held between the tip portion 70 of the top panel 22 and the tip portion 72 of the front panel 58. This sealing gasket not only provides a seal resistant to ingress of liquid solid and gaseous contaminants but also assists in mechanical support of the front panel 58 on the front edge 54 of the top panel 22 and further allows a degree of mutual movement and variability of position between the top panel 22 and the front panel 58 whilst maintaining the integrity of the enclosure. The mutually engaging staircase structure on the tip portions 70,72 also permit such movement. A staircase structure of similar type is provided also on the front base panel 40 and the lower edge 76 of the front panel 58 so that the front panel 58 is supported both at the top and bottom by such a staircase structure comprising a sealing gasket 74. The rear panel 60 is similarly provided with staircase structures and the rear base panel 44 also has a complementary structure. FIG.5 shows a cross sectional view, along the line X-X' in FIG.3 looking in the direction of the arrows, of the join between the side cover 16, the top cover 22 and the frame 10. A top cover support gasket 78 of rubber or other elastic material allows the top cover 22 to rest upon the top face 24 of the frame 10 proximate to the top side edges 30 of the Frame 10. Likewise a side panel support gasket 80 again in the form of rubber or other elastic or elastomer material supports the side panel 16 against the side face 14 of the frame 10. The side panel support gasket 80 is provided with a standoff arm or ledge 82. The side edge 28 of the top panel 22 descends between the top edge portion 48 of the side panel 16 and the top side edge 30 of the frame 10 to reach a point close to the standoff arm or ledge 82. The support gaskets 78 80 reach along the entire length of the frame 10 and the combination of the shielding action of the top edge position 48 of the side panel 16 , the shielding action of the of the side edge 28 of the top panel 22 and of the two gaskets 78 80 acting against the frame 10 provide further protection against the ingress of foreign matter in the form of solids, liquids or vapours. Figure 6 shows the manner in which the lower edge 76 of the front panel 58 is attached to the front base panel 40 in co-operation with the side base panel 12. It is to be understood that the rear panel 60 is attached to the rear face 46 of the frame 10 employing the rear base panel 44 and the side base panel 12 in just the same manner. It is further to be understood that while Figure 6 shows just one side of the lower edge 76 of the front panel 58, the other side is held in exactly the same manner as hereinafter described. Each side of the front base panel 40 and of the rear base panel 44 is provided with a leg 84 (also shown in figure 1) which fits into an aperture in the frame 10 on either side of the front 42 or rear 46 face . The aperture forms a void and the leg 84 engages the edges or extremities of the void to allow the front base panel 44 to swing as indicated by the arrow 86. The leg 84 also provides support for the front base panel 40 on the frame 10. The lower edge 76 of the front panel 58 is provided at its extremity with a projection 88. While the projection 88 is only required to perform the function for which it is hereinafter described, it is preferred that the projection 88 should be identical with the arm 62 so that the front panel 58 may be mounted upon the front face 42 of the frame 10 either way up. The side face panel 12 comprises a recess 90 which accepts the leading edge 92 of the lower edge 76 of the front panel 58. The front base panel 40 comprises a clamp member 94 operative to trap the projection 88 in the recess 90 to hold the front panel 58 in position. With reference both to figure 6 and figure 7, the arm 62 on the top edge 64 of the front panel 58 been inserted into the gaps 68 , the front panel 58 is swung as indicated by the arrow 96 such that the projections 88 enter the recess 90 in the side base panel 12 all the time with the front base panel 40 as indicated in figure 6 at an angle to its final position such that the clamp member 94 allows passage of the projection 88 into the recess 90 while the leg 84 is in its aperture or void in the frame 10 . Thereafter the frontbase panel 40 is rotated as indicated by the arrow 86 for the clamp member 94 to come up behind the projection 88 and trap the projection 88 in the recess 90 to hold the front panel 58 in position. In entering that position a further staircase structure 98 also comprising a gasket engages its complementary staircase structure (not shown in figure 6 ) in the lower edge 76 of the front panel 58 to provide mechanical support as generally indicated in figure 4. The front base panel 40 is provided with a locking device 100 which also comprises a frame portion 102. The locking device 100 102 can be of any type. It is preferred either to be a simple mechanical key operated lock or a quick release screw device whereby the front base panel 40 may be quickly fixed in place and, if dismantling of the enclosure is required, swung back into the position indicated in figure 6 ready to allow dis-assembly of the enclosure. When the enclosure is assembled the front panel 58 rests between the front edge portions 50 of the side panels 16 and the rear panel 60 rests between the rear edge portions 52 of the side panels 16. The separation of the side panels 16 can thus equally be defined by engagement of the front edge portions and rear edge portions 50 52 of the side panels 16 with the edges of the front 58 and rear 60 panels. The overall dimensions of the completed enclosure are thus defined by the mutual engagement of the panels 16 22 40 12 58 60 and the frame 10 can be in range of possible positions within the enclosure depending upon the build up of mechanical tolerances between the frame 10 and the panels 16 22 58 60 40 44 and between the panels 16 22 40 44 58 60 themselves. For example, if the top panel 22 is particularly wide , the separation between the side panels 16 will be decided by the width of the top panel 22. On the other hand, if the top panel 22 is narrower than its specified dimension, and the front or rear panel 58 60 is the widest, the overall width of the enclosure and the separation between the side panels 16 will be determined by the width of the widest panel 58 60 22. Likewise, if the top panel 22 is longer than its specified dimension, because the front panel 58 and the rear panel 60 are attached to the top panel 22 alone at their respective top edges 64 66 , the front panel 58 will adopt a position spaced from the front face 42 of the frame 10 (save for the gasket filling any gap) and the overall dimensions of the enclosure front to rear will be determined by the length of the top panel 22. The manner of attachment of the lower edge 76 of the front panel 58 (and of the rear panel 60) as shown in figures 6 and 7 allows a degree of angular tolerance in the position of the front panel 58 since only the lower edge 76 is attached. The front panel 58 is therefore able to accomodate the above described tolerances in length of the top panel 22. The preferred use of the enclosure is for housing data processing equipment including data procssors, disc drives, communications devices, power supplies, fans, blowers and the like. It is however to be appreciated that other equipment can be housed in such an enclosure. Examples of such other equipment include small scale laboratory chemical processing equipment, pneumatic equipment and hydraulic equipment. The frame 10 for preference is mounted upon castors (not shown) and the side base panels 12 and the front 40 and rear 44 base panels together form a plinth allowing the castors freedom to roll whilst providing visual concealment. If the castors are omitted, the plinth so formed is the overall support for the frame 10 together with concealed feet in place of the castors. It is further to be appreeciated that the frame 10 can comprise a base panel for its insulated and enclosed support on its lower face.

Claims: An equipment enclosure comprising: a support frame (10); a side panel (16) for attachment to a top edge (30) of a side face (14) of said frame to cover said side face; a top panel (22) for covering a top face of said frame with a front edge (54) of said top panel in proximity with a top edge of a front face of said frame and a rear edge (56) of said top panel in proximity with a top edge of a rear face of said frame; a front panel (58) for attachment to said front face of said frame and for attachment to said top panel at said front edge; and a rear panel (60) for attachment to said rear face of said frame and for attachment to said top panel at said rear edge; said front panel (58) and said rear panel (60) being co-operative with said top panel (22) to hold said top panel onto said frame; and said top panel (22) being co-operative with said top edge (30) of said side face of said frame to prevent removal of said side panel from said frame. An enclosure according to Claim 1 comprising a front base panel for attachment to a lower edge of said front face with said front base panel in engagement with a lower edge of said front panel to provide said attachment of said front panel to said front face. An enclosure according to any of the preceding Claims wherein said side panel comprises a stud; wherein said top edge of said side face of same frame comprises a recess; wherein said attachment of said side panel to said side face of said frame includes insertion of said stud into said recess; and wherein said top panel, when co-operative with said top edge of said side face, is operative to prevent removal of said stud from said recess. An enclosure according to Claim 2 or according to Claim 3 when dependent upon Claim 2 comprising a side base panel for attachment to a lower edge of said side face; said side base panel including a recess for accepting a projection at said lower edge of said front panel; and said front base panel, when attached to said frame, being operative to trap said projection in said recess to provide said attachment of said front panel to said frame. An enclosure according to any of the preceding Claims wherein said top, side, front and rear panels, when on said frame, are in mutual engagement; and wherein said frame is located within said enclosure within a range of possible positions. An enclosure according to Claim 5 wherein said side panel comprises an upper edge portion which, when said side panel is attached to said frame and when said top panel is covering said top face, projects above said upper edge of said side face to engage a side edge of said top panel for said top panel to define the position of said upper edge portion of said side panel. An enclosure according to Claim 5 or Claim 6 wherein said side panel comprises a front edge portion which, when said side panel is attached to said frame and said front panel is attached to said front face, projects beyond a front edge of said side face to engage a side edge of said front panel to define the position of said front edge portion of said side panel. An enclosure according to Claim 2, or according to any of Claims 3 to 7 when dependent upon Claim 2, wherein said front base panel comprises: a leg insertable into a void in said front face of said frame to engage extremities of said void; and a catch operative to lock said front base panel to said frame; said leg, said extremities of said void and said catch being co-operative to provide said attachment of said lower base panel to said lower edge of said front face. An enclosure according to any of the preceding Claims wherein said front panel comprises an arm at a top edge of said front panel; and wherein said top panel comprises means operative to engage said arm to provide said attachment of said front panel to said top panel at said front edge. An enclosure according to any of the preceding Claims used to house electronic equipment.

Inventors: MCINTOSH, RENNIE FRANK
Applicants: UNISYS CORPORATION
Application year: 1987
Main classification: H05K7
IPC codes: A47B47, H05K5, H05K7