Abstract:
A group of identical bezel plates having bilateral symmetry interchangeable, in a compound bezel assembly, with at least one other group of identical bezel plates having bilateral symmetry to produce multiple, bilaterally symmetrical, compound bezel configurations with different appearances using a minimal number of component plates; and method and apparatus for providing a venting bezel assembly with a plenum chamber formed between component plates.

Description:
RELATED PATENT APPLICATIONS 
     This application is a continuation of Ser. No. 09/295,491 filed Apr. 20, 1999 now Pat. No. 6,183,053. This patent application contains subject matter related to U.S. patent application Ser. No. 09/294,965, now U.S. Pat. No. 6,116,023, filed Apr. 20, 1999 for ADJUSTABLE BEZEL ASSEMBLY of Foslien filed on the same date as the U.S. patent application Ser. No. 09/295,491 filed Apr. 20, 1999, now U.S. Pat. No. 6,183,053, both hereby incorporated by reference for all that they disclose. 
    
    
     FIELD OF INVENTION 
     The present invention relates generally to the production of bezel assemblies and, more particularly, to the cost effective production of multiple bezel assemblies with different appearances through the use of interchangeable component plates. 
     BACKGROUND OF THE INVENTION 
     Many devices used in the computer, telecommunications, electronics and other industries are mounted in sheet metal housings which are in turn mounted in a vertical rack assembly. Rack mounts have long been used in electronics instrumentation applications to mount housings containing various instruments such as voltmeters, signal generators, oscilloscopes, and power supplies. The telecommunications and networking industry often mount switching assemblies and other components in rack mounted housings. Examples of rack mounted housings applications in the home electronics industry include stereo components and home entertainment center audio and video components. In the computer industry computers and computer peripherals including mass storage devices such as tapes, optical disks, CD-ROMs, DVDs are provided in rack mounted sheet metal housings. Sheet metal housings are also used to house peripheral devices such as DVD drives which are fixedly or removable mounted in bays within a larger computer housing. 
     In rack mounted housings, and some other types of housings as well, an assembly known as a “bezel assembly” or simply “bezel” is attached to the front face of the housing. In some cases the bezel has no function other than to provide a “finished” appearance to the portion of the housing which is visible to users. In other cases the bezel may contain an opening, such as for insertion or removal of media, control knobs or buttons, viewable displays or other functional features. However even with such functional bezels, the appearance of the bezel is usually considered very important to the organization which markets the associated product. In many cases the bezel is the only feature of the product which the end user actually sees. 
     In many industries one company, generally referred to as an “original equipment manufacturer” or “OEM”, manufactures a particular product which it sells to other companies. Each of these other companies subsequently sells the product under its own trademark or brand name, either to distributors or directly to end users. In such cases the company selling to the distributors/end users may require the OEM to provide visual marking that identifies the product with the company selling to distributors/end users. For products sold in housings, this identifying visual marking is often provided by customizing the housing&#39;s bezel. However, producing customized bezels for its different customers typically significantly increase an OEM&#39;s manufacturing costs. If the OEM simply sells the same identical product to each of its customers it is able to maintain relatively low production costs since the same machinery, tooling and production steps may be used for producing all of the products. If the OEM produces a customized bezel for each of its customers, separate bezel tooling must be created for each customer and, depending upon the bezels, special assembly techniques and/or components may be required as well. 
     It would be generally desirable to provide a bezel assembly of a type which may be efficiently and inexpensively produced in a plurality of different configurations, each having a unique appearance. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a method and apparatus for producing multiple bezel assemblies having different appearances. 
     Thus the invention may comprise a bezel assembly for a modular rack mounted device comprising a unitary central plate having a central longitudinal plane extending parallel to its lateral side face portions. The central plate is symmetrical about the central longitudinal plane. The bezel assembly includes a first side plate having a central longitudinal plane extending parallel to its lateral side face portions, and having a central lateral plane extending parallel to its top and bottom face portions. The first side plate is bilaterally symmetrical about at least one of the central planes thereof and is disposed with one of the lateral side face portions thereof in adjacent relationship with a first lateral side face portion of the central plate. The bezel assembly includes a second side plate identical to the first side plate having a central longitudinal plane extending parallel to its lateral side face portions, and having a central lateral plane extending parallel to its top and bottom face portions. The second side plate is bilaterally symmetrical about at least one of the central planes thereof and is disposed with one of the lateral side face portions thereof in adjacent relationship with the second lateral side face portion of a central plate. 
     The invention may also comprise a method of producing housing assemblies including: 
     a) providing a plurality of identical housing frames; 
     b) providing a plurality of identical central bezel plates each being bilaterally symmetrical about a plane of symmetry; 
     c) providing a plurality of first identical side plates, each having a front face portion with a first front surface configuration, first and second parallel lateral side face portions and each being bilaterally symmetrical about a plane of symmetry; 
     d) providing one or more other sets of identical side plates including at least a plurality of second identical side plates, each having a front surface configuration different from said the front surface configuration of the first side plates and each being bilaterally symmetrical about a plane of symmetry; 
     e) mounting pairs of the plurality of identical first side plates on individual ones of the plurality of identical housing frames with one of the identical central plates disposed between each of the pairs of first side plates in a plate arrangement which is bilaterally symmetrical about the plane of symmetry of the central plate to provide a plurality of housing assemblies having a first bezel configuration; 
     f) mounting pairs of the plurality of identical second side plates on individual ones of the plurality of identical housing frames with one of the identical central plates disposed between each of the pairs of second side plates in a plate arrangement which is bilaterally symmetrical about the plane of symmetry of the central plate to provide a plurality of housing assemblies having a second bezel configuration. 
     The invention may also comprise a bezel assembly including a first plate and a second plate each having at least one vent passage extending therethrough. The second plate is mountable in overlying peripherally abutting relationship with the first plate with at least one interior portion thereof positioned in spaced relationship with an oppositely positioned portion of the first plate. A plenum chamber is formed between the first and second plates with the vent passages in the first and second plates being in fluid communication with the plenum chamber. The plenum chamber obviates aligning the vent passages of the two plates to pass air through the two plate assembly. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The objects and advantages of the invention will become more apparent and more readily appreciated from the following detailed description of the presently preferred exemplary embodiments of the invention taken in conjunction with the accompanying drawing, of which: 
     FIG. 1 is a front perspective view of three rack mounted housing modules having three identical front bezel assemblies; 
     FIG. 2 is a front perspective view of one of the housing modules of FIG. 1 with one media drawer thereof extended; 
     FIG. 3 is rear perspective view of the housing module of FIG. 2; 
     FIG. 4 is a rear perspective view of a drawer bracket and a drawer bezel assembly and lock plate associated therewith; 
     FIG. 5 is a front perspective view of the housing module of FIG. 2 with the front bezel assembly removed therefrom; 
     FIG. 6 is a rear elevation view of a drawer bezel assembly; 
     FIG. 7 is a rear elevation view of a drawer bezel assembly received in a drawer mounting bracket; 
     FIG. 8 is a rear elevation view of a drawer bezel assembly received in a drawer mounting bracket and locked into position with a lock plate; 
     FIG. 9 is a front perspective of a drawer attachable plate portion of a drawer bezel assembly; 
     FIG. 10 is a top plan view of a removable plate portion of a drawer bezel assembly of which the bottom plan view is a mirror image; 
     FIG. 11 is a rear elevation view of the removable plate portion of a drawer bezel assembly of FIG. 10; 
     FIG. 12 is a front perspective view of a central plate of a bezel assembly; 
     FIG. 13 is a rear perspective view of the central plate of FIG. 12; 
     FIG. 14 is a front perspective view of a bottom chin plate of a bezel assembly; 
     FIG. 15 is a rear perspective view of a bottom chin plate; 
     FIG. 16 is a front perspective view of a middle chin plate of a bezel assembly; 
     FIG. 17 is a front perspective view of a forehead plate of a bezel assembly; 
     FIG. 18 is a rear perspective view of a forehead plate; 
     FIG. 19 is a front perspective view of one configuration of a drawer bezel assembly; 
     FIG. 20 is a front perspective view of a second configuration of a drawer bezel assembly; 
     FIG. 21 is a front perspective view of a third configuration of a drawer bezel assembly; 
     FIG. 22 is a front elevation view of two bezel assemblies mounted on associated housing units in a two stack rack mount format; and 
     FIG. 23 is a front elevation view of a single bezel assembly associated with a single housing unit. 
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The drawing FIGS. 1-23, in general, illustrate method and apparatus for producing a plurality of different bezel assemblies  28  for housing modules  10 . Such different bezel assemblies  411 ,  461 , and  501  are shown in FIGS. 1,  23  and  22 , respectively. The components of each bezel assembly include a plurality of identical central plates  270 , FIG. 12, each being bilaterally symmetrical about a plane of symmetry  271  and having first and second lateral side face portions  292 ,  294  extending generally parallel to the plane of symmetry  271 . Also included is a first plurality of identical side plates  410 , FIG. 19, each having a front face portion  412  with a first front surface configuration, first and second parallel lateral side face portions  434 ,  436  and each being bilaterally symmetrical about a plane of symmetry  440  whereby a first one of the first plurality of identical side plates  410  is positionable with one of the lateral side face portions  434 ,  436  thereof in adjacent parallel relationship with the first lateral side face portion  292  of one of the central plates  270  and another of the first plurality of identical side plates  410  is positionable with one of the lateral side face portions  434 ,  436  thereof in adjacent parallel relationship with the second lateral side face portion  294  of the central plate  270  to provide a first three plate bezel configuration  411 , FIG. 1, which is bilaterally symmetrical about the plane of symmetry  271  of said central plate  270 . 
     The components also include a second plurality of identical side plates  460 , FIG. 20, each having a front face portion  462  with a second front surface configuration different from the first front surface configuration. The second plurality of identical side plates  460  each have first and second parallel lateral side face portions  463 ,  465  and are bilaterally symmetrical about a plane of symmetry  484  whereby a first one of the second plurality of identical side plates is positionable with one of the lateral side face portions  463 ,  465  thereof in adjacent parallel relationship with the first lateral side face portion  492  of one of the central plates  270  and another of the second plurality of identical side plates  460  is positionable with one of the lateral side face portions  463 ,  465  thereof in adjacent parallel relationship with the second lateral side face portion  294  of the central plate  270  to provide a second three plate bezel configuration  461 , FIG. 23, which is bilaterally symmetrical about the plane of symmetry  271  of the central plate  270  and which is different in appearance from the first three plate bezel configuration  411 . 
     Having thus described method and apparatus for forming multiple bezel assemblies in general, various components and subassemblies thereof will now be described in further detail. 
     FIG. 1 illustrates a standard rack frame  10  well known in the art having a top wall  12  a pair of side walls  14 ,  16  and an open front face  18 . Rack frames of this type are available under the product designation HP Rack System/E41 from Hewlett-Packard Company. A plurality of ribs  20 ,  22  or other bracket like components and screw holes  24 ,  26 , etc. and the like enable sheet metal housings module units  30 , FIGS. 2 and 3 to be mounted in stacked relationship within the rack frame  10 . Rack frames may be provided in various heights to accommodate different numbers and sizes of housing units. For example, the rack assembly  10  illustrated in FIG. 1 is shown having three housing units stacked therein with open space below for the mounting of additional housing units of the same type or different types. Each of the three housing units positioned in rack  10  have an identical bezel assembly  28  mounted thereon which covers the front of the housing  30  and the front edge portion  29  of the rack frame  10 . 
     FIGS. 2,  3  and  5  illustrate a parallelepiped shaped (box shaped) housing  30  of a data storage media autochanger. The housing  30  has a top wall  32 , a bottom wall  34  and lateral side walls  36 ,  38 . As shown in FIG. 5 the housing  30  has a front wall  42  with left, central and right front wall opening  41 ,  43 ,  45  respectively, provided therein. As illustrated in FIG. 3 the housing comprises a rear wall  44  having rear wall openings  46 ,  48 ,  50 . Each of the front and rear walls of the housing comprise a plurality of cutouts  47 ,  49 , etc. and screw receiving bores  53 , etc. provided therein. 
     As best illustrated in FIGS. 2 and 3 each of the housings  30  have mounted therein two identical media holding drawers  54  with slots  56 ,  58 , etc. therein for receiving and holding data storage media  60 ,  62 , etc. such as tape cartridges, optical disk cartridges, CD ROMs, DVDs, etc. The media  60 ,  62  are moved into and out of slots  56 ,  58  in the directions indicated at  64  by a picker assembly (not shown) such as described in detail in U.S. patent application Ser. No. 09/137,350 filed Aug. 20, 1998 for MODULAR DATA STORAGE SYSTEM of Joseph White, Matthias Lester and Dave Jones, which is hereby incorporated by reference for all that is disclosed therein. The housing  30  may comprise a plate  66  in its top wall if it is used as the upper most housing in the rack. When the housing is disposed below the top housing, plate  66  is removed. The bottom wall has a similar bottom wall plate (not shown) in aligned relationship with plate  66  which remains in place if the housing  30  is the lower most housing in the stack. Otherwise the bottom housing plate is removed. As described in detail in the above referenced patent application of White et al. a picker assembly may move vertically between the housings units  30  of the stacked array in one autochanger embodiment. In other autochanger embodiments each of the housings units  30  may have a picker assembly which accesses data media only within that single housing. A rear portion  68  of the housing may have media drives (not shown) mounted therein which may also be accessed by the picker assembly. 
     Each media drawer  54 , FIGS. 2 and 3, has a front end portion  72  on which is mounted, as by brackets, screws, clips, or any other attachment means a bracket  74 . The bracket  74 , FIG. 4, has a bottom wall portion  76 , a central wall portion  78 , and two lateral sidewall portions  82 ,  84 . The central wall portion  78  has a plurality of holes  92 ,  94 ,  96 ,  98 ,  102 ,  104 ,  106 , FIG. 7, provided therein. The holes may be rectangular in shape, each having lateral edge portions  91 ,  93  and top and bottom edged portions  95 ,  97 . 
     Attachment of a drawer bezel assembly  140  to bracket  74  is facilitated by a snap-on attachment plate  110  shown in FIGS. 4 and 8. The snap-on plate  110  has a large central cutout  112  with partially rectangular upper corner portions  114 ,  116  and has lower rectangular shaped cutouts  118 ,  120 . Cutout portions  114 ,  116 ,  118 , and  120  receive projecting portions of the drawer plate therethrough as described in further detail below. Large cutout  112  defines a locking portion  122  having an upper surface  124  connected at  123  to a downwardly and inwardly sloping surface  126  and has a lower surface  127 . A tab  128  projects forwardly from the plate  110  and may be provided at an upper portion thereof. 
     Drawer bezel assembly  140 , FIGS. 2-4,  6 - 8  and  19 - 21 , comprises a drawer attachable plate portion  142 , best illustrated in FIG. 9, and a removable plate portion  144 , shown from the top and rear in FIGS. 10 and 11. The drawer attachable plate portion  142  comprises a rear face portion  146 , FIG. 4, having bores  148 ,  150 , etc. therein for attaching removable plate portion  144  as with screws  152 . Drawer attachable plate portion  142  has raised surface portions  154 ,  156  adapted to abut the forward face of bracket  74  central wall portion  78 . A plurality of rearwardly projecting stud portions  161 - 166  are provided at the rear surface  160  of plate portion  142 . Each stud portion comprises a lip portion  170  having an inwardly positioned vertical surface portion  172  extending generally parallel to surfaces  154  and  156  and positioned rearwardly (outwardly)  174  thereof. The distance in direction  174  between surface  172  and surfaces  154 ,  156  is just slightly greater, e.g., 0.5 millimeters greater than the combined thickness of bracket  74  central wall portion  78  and plate  110  which may have thicknesses of e.g., 1.4 mm and 1.4 mm respectively. Each lip portion  170  has lateral side surfaces  171 ,  173  which are separated by a distance smaller, e.g., 2.2 mm smaller, than the distance between lateral edges  91 ,  93  of the holes  92 ,  94 , etc. in bracket  74  central wall  78 , FIGS. 6 and 7. Similarly, each lip  170  comprises top and bottom surfaces  175 ,  177  which are separated by a distance somewhat less than, e.g., 5.2 mm less than, the distance between top and bottom edges  95 ,  97  of the holes  92 ,  94 , etc. in bracket  74 . This size relationship between lip portions  170  and rectangular cutouts  92 ,  94 , etc. enables a floating relationship between the bracket  74  and the drawer bezel assembly  140  which facilitates registration with a chin plate as explained in further detail below. Also, an upper recessed horizontal surface portion  169  extending parallel to and recessed, e.g., 2.5 mm from surface  175  limits downward displacement of plate  110  as described further below. 
     The drawer attachable plate portion  142  of the drawer bezel assembly  140  also has projecting from the rear surface thereof a deflectable member portion  176  which is adapted to be deflected in direction  178  by snap-on attachable plate  110  downwardly and inwardly sloping surface  126  and to thereafter elastically return in direction  179  to lock snap-on attachment plate  110  in position as described in further detail below. The deflectable member portion  176  has a bottom edge surface  182  which engages surface  124  of locking plate  110  when the locking plate is in the locked position illustrated in FIG.  8  and further described below. 
     FIG. 9 is a front perspective view of drawer bezel assembly drawer attachable plate portion  142 . Plate portion  142  has a lower more forwardly projecting portion  184  having a rectangular shaped front face portion  185 , a bottom face portion  186 , a top face portion  188  and first and second lateral side face portions  190 ,  192  respectively. A lock opening  194  may be centered in portion  184  for receiving a lock assembly  195 , FIG. 21 which co-acts with structure (not shown) inside the housing  30  to lock the media drawer when the lock assembly is suitably actuated as with a conventional key. The drawer attachable plate portion  142  may comprise an upper, less forwardly projecting portion  208 , which may be integrally formed with portion  184  and which may have one or more vent openings  209 ,  211 , etc. extending therethrough. Upper portion  208  may comprise a top face portion  212 , lateral side face portions  214 ,  216  which may be laterally recessed, e.g., 3.8 mm, from side faces  190 ,  192 . Upper portion  208  may also comprise a rectangular shaped front face portion  210  which may be recessed rearwardly, e.g., 8 mm, from front face portion  185 . 
     FIGS.  4  and  6 - 8  illustrate the manner by which drawer attachable plate  142  is attached to drawer bracket  74 . FIG. 6 is a rear elevation view of plate portion  142  prior to engagement with drawer bracket  74 . In FIG. 7 plate portion  142  has been positioned with the rearwardly projecting stud portions  161 - 166  thereof extending through the openings  92 ,  94 ,  96 ,  98 ,  102 ,  104  of drawer bracket  74 . The bracket central wall  78  is positioned in abutting engagement with raised surface portions  154 ,  156  of drawer attachable plate portion  142 . Next, locking plate  110  is positioned as illustrated in dashed lines in FIG. 8 with cutout portions  114 ,  116 ,  118 , and  120  receiving stud portions  161  through  164  therethrough and with stud portions  165 ,  166 , positioned below edge surfaces  130 ,  132 . Next, as shown in FIG. 8, the plate  110  is urged downwardly,  220 , as by pushing on tab  128  from the position shown in dashed lines to the position shown in solid lines. During this downward movement the downwardly and inwardly sloping surface  126  of the snap-on attachment plate  110  engages the lower portion of plate  142  deflectable member  176  urging it in direction  178  until it clears the tip  123  of locking portion  122 , which corresponds with the engagement or near engagement of surfaces  115 ,  117 ,  119 ,  121 ,  130 , and  132  with upper recessed horizontal surface portion  169 , FIG. 4, of each of the stud members  161 - 166 . In other words, plate  110  is captured with respect to vertical  220 ,  221  movement between an abutting surface  182  of deflectable member  176  and abutting surfaces  169  of stud members  161 - 166 . Once positioned, as illustrated in solid lines in FIG. 8, the attachment plate  110  is also captured with respect to forward or rearward  174 , FIG. 4, displacement. It is prevented from being removed in direction  174  by the abutting engagement between the rear vertical surface portion  172 , FIG. 4, of each lip portion  170  and the flat face surface  111  of snap-on plate  110 . In order to remove the snap-on plate  110  it is necessary for a user to move deflectable member portion  176  in direction  178  until it clears tip  123 , FIG. 4, and thereafter to slide snap-on attachment plate  110  upwardly,  221 , to a position where the plate is no longer engaged by the rear surface portion of the lip portions  170  of studs  161 - 166 . Thereafter, the plate  110  may be moved rearwardly to remove it from the studs. Next, the drawer attachable plate portion  142  may be moved upwardly  221  with respect to the bracket plate  74  to position the upper edges  95  of holes  92 ,  94 , etc. above the lip portions  170  of the stud portions. Finally, the drawer attachable plate portion  142  may be moved rearwardly,  174 , FIG. 4, with respect to the bracket  74  to entirely remove it therefrom. 
     It will be appreciated from the above description that, even though the attachment plate  110  is prevented from moving with respect to the drawer attachable plate portion  142 , the drawer attachable plate portion  142  is relatively displaceable with respect to the drawer bracket  74 . Relative movement between plate portion  142  and bracket  74  in a direction parallel to bracket central wall portion  78  due to the fact that the cut out  92 ,  94 ,  96 ,  98 ,  102 ,  104  in the central wall portion  78  are larger, both vertically  221 ,  221  and horizontally  178 ,  179  than the studs  161 - 166  received therethrough. There is sufficient frictional contact between bracket central wall portion  78 , which may be constructed from sheet metal, and the abuttingly engaged surfaces  154 ,  156  of plate portion  142  which may be constructed from high strength plastic, to ordinarily retain plate portion  142  in stationary relationship with respect to bracket central wall portion  78 . However, this frictional engagement is sufficiently weak that a person of ordinary strength can move plate portion  142  both translationally and rotationally with respect to bracket central wall portion  78  (in translational directions parallel to wall portion  78  and rotational directions about axes perpendicular to central wall  78 . Such displacement may be necessary to align plate portion  142  and attached removable plate portion  144  with adjacent bezel components such as central bezel plate  270  and/or chin plates  310 ,  330 . 
     It will be appreciated by those having skill in the art that although plate portion  142  is the specifically described embodiment has six stud portions  161 - 166  that a similar floating attachment could be provided with one or any member of rear projections. Similarly, although member  176  is shown in an arrangement where it deflects laterally, any other snap lock configuration may be used such as, for example, an arrangement where member  123  projects in direction  174  rather than direction  178  and wherein member  176  moves in direction  174  and the opposite direction in order to snap lock into position. It is also to be understood that the snap fit relationship between plate portion  142  and attachment plate  110  may also be accomplished by one or more flexible members mounted on attachment plate  110  which coact with rigid surface portion projecting from plate portion  142 . For example, a flexible member (not shown) similar in profile to member  176  but rotated 180° could be provided on plate  110 . A rearwardly projecting locking stud (not shown) similar in profile to that of locking portion  122  but rotated 180° could be provided on plate portion  142 . The flexible member (not shown) provided on the locking plate  110  and the locking stud (not shown) provided on plate portion  142  could be constructed and arranged such that the flexible member (not shown) was deflected laterally by the locking stud (not shown) during downward displacement of the plate  110  until it snapped laterally back to a position below the locking stud. In this position it would prevent the plate  110  from being moved upwardly because of the abutting engagement between the end of the flexible member (not shown) and the locking stud (not shown). 
     The above described mounting and dismounting of plate portion  142  from drawer bracket  74  would ordinarily be accomplished with removable plate portion  144  attached to drawer attachable plate portion  142 . The structure of one embodiment of a removable plate portion  144  and a manner of attachment thereof to drawer attachable plate portion  142  will now be described with reference to FIGS. 2,  4 ,  10 , and  11 . Each removable plate portion  144  comprises first and second bottom/top wall portions  232 ,  233 . The plate portion  144  comprises a first lateral side wall  234  having a first rearwardly projecting flange portion  236  having an inter-surface portion  237  which abuts plate  142  lateral side wall portion  216  or  214  depending upon whether plate  144  is mounted on a left-hand or right-hand drawer. Plate portion  144  also comprises a second lateral side face  238  with rearwardly projecting flange portion  240  having an inner-surface  241  adapted to abut surface  214  or  216 . Plate portion  144  has a rear edge surface portion  242  comprising portions  244 ,  246  associated with flanges  236 ,  240  respectively. The removable plate has first and second horizontally extending peripheral rear edge surface portions  248 ,  250  which are recessed, e.g. 6.7 mm, from edge portions  244 ,  246  and extend transversely thereof. A plurality of screw receiving bosses  252 , may be integrally formed with and project rearwardly from the removable plate portion  144 . The bosses are positioned with respect to the lateral side face portions  234 ,  238 , so as to be positioned in alinement with corresponding holes  148 ,  150 , etc, in the drawer bracket attachable plate portion  142  for securing plate portion  144  to plate portion  142 . The spacing between the inner surfaces  237 ,  241  of flange portions  236 ,  240  is substantially the same as the spacing between lateral side faced portions  214 ,  216  of member  142  to maintain lateral stability of the plate  144  when mounted on plate  142 . Surfaces  248 ,  250  of removable plate portion  144  are positioned in abutting engagement with front face  210  of plate portion  142 . Removable plate portion  144  comprises a plurality of vent openings  251 ,  253  extending therethrough from front to rear. The plane  257  of rear peripheral wall portion  255  positioned about each vent opening is preferably recessed e.g., 2.5 mm from the edge surface portions  248 ,  250  which abuttingly engage plate  142 . Thus, the front face  210  of upper portion  208  of plate  142  and the rear surface  259  of plate  144  and inner surfaces  237 ,  241  of plate  144  lateral side walls  234 ,  238  define a plenum chamber (manifold)  254  which is in fluid communication with both vent openings  252 ,  253  in plate  144  and vent openings  209 ,  211 , etc. in plate  142 . Thus, the housing  30  is vented by air traveling through vent openings  251 ,  253 , etc. and  209 ,  211 , etc. and corresponding holes in bracket  74  and snap on plate. The plenum chamber obviates the need to alight the vent openings in plate  142  with those in plate  144 . 
     FIGS. 12 and 13 illustrate a central bezel plate  270  having a plane of symmetry  271  dividing the plate into mirror image left and right halves  273 ,  275 . The plate has a front face portion  272  having a rectangular periphery. The front face may include left and right opaque, vertically elongated rectangular panels  274 ,  276  extending from the top to the bottom of the front face. The front face may also include a central intermediate, vertically elongated, rectangular panel  278  which may be transparent. Panel  278  may extend between top and bottom opaque horizontally elongated panels  282 ,  284 . In some configurations the central transparent panel  278  may be replaced, as shown in FIG. 1, by an upper plate  277  and a lower plate  283 . The upper plate may be transparent and may have a control panel  279  positioned immediately behind it. The control panel may have buttons  280 ,  281 , etc. projecting through corresponding holes in upper plate  277 . Central bezel plate  270  may include a generally rectangular top face portion  286  and generally rectangular bottom face face portion  288  as shown in FIGS. 12 and 13. The central bezel plate  270  may also include a generally rectangular left lateral side wall  292  and right lateral side wall  294 . Projections  296 ,  298 , etc. and bored bosses  300 , etc. and lower flange  302  having bores  304 , etc. therein are adapted to facilitated attachment of central plate  270  to the front face  42  of sheet metal housing  30  and/or attach chin plate  310  thereto. In a typical autochanger rack configuration only one of the bezel assemblies  28  provided on each housing would include a control unit. The other bezel assemblies would simply contain the single transparent plate  278  as best illustrated in FIG.  1 . The central bezel plate may be constructed from any relatively rigid, durable material such as metal or high strength plastic. 
     FIGS. 14 and 15 illustrate a chin plate  310  which is adapted to be used with the bottom most one in a stacked array of bezel assemblies  28  as illustrated in FIG.  1 . The bottom chin plate  310  may have a generally flat rectangular front face portion  312 , rectangular lateral side wall portion  314 ,  316  and a rectangular bottom wall  317 . The front face may have a horizontally elongated bore  320  extending there through for the purpose of power switch access. A plurality of flanges  322 , etc. screw receiving bores  324 , etc. and rear projections  326 , etc. are provided for attaching the bottom chin plate  310  to central plate flanges  302  and the housing  30 . The bottom chin plate  310  is not attached to the drawer bezel assembly  140 . A middle chin plate  330  which is adapted to be used with all bezel assemblies  28  in a stacked array, except for the bottom most bezel plate assembly is illustrated in FIG.  1  and FIG.  16 . Depending upon the slot spacing distances in a rack  10  the middle chin plate  330  may have a height greater than, less than or equal to the height of the bottom chin plate  310 . As best seen in FIG. 1 the middle chin plate  330  is configured to maintain a generally planar relationship with each portion of the bezel assembly  28  components that are positioned immediately above it. Thus, as illustrated in FIG. 16 the middle chin plate may comprise a front face having a central rectangular front wall portion  332  outer rectangular front wall portions  334 ,  336 , and intermediate rectangular front face portions  338 ,  340 . The outer face portions and intermediate face portions are connected by forwardly projecting portions  342  (only one shown). The central face portion  332  may be recessed slightly from the intermediate face portions  338 ,  340 . The middle chin plate  330  has a bottom face portion  344  a top face portion  346  and opposite side face portions  348  (only one shown). The middle chin plate may have the same type of connector structure as described above with respect to the bottom chin plate  310 . It will be seen from FIG. 1, FIG. 22, and FIG. 23 that the chin plates  310 ,  330  are adapted to be positioned immediately below associated drawer bezel assemblies  140  and central bezel plates  370 . The chin plates are fixedly attached to the central bezel plates  270  and may serve as a reference structure for alignment of the left and right drawer bezel assemblies  142  which are positioned immediately above the left and right end portions of an associated chin plate. The above described structure for mounting the drawer bezel assembly on an associated drawer bracket  74  allows the drawer bezel assembly to “float” i.e., be displaced and rotated slightly in a horizontally and vertically extending plane perpendicular to plane  271 . Thus, each drawer bezel assembly  140  may be hand rotated and vertically displaced if necessary to position it with the bottom face portion thereof in the exact parallel relationship with the top face portion of an associated chin plate  310  or  330 . 
     FIGS. 17 and 18 illustrate a forehead plate  350  which may have a smooth rectangular front face portion  352  a rectangular top face portion  354 , rectangular lateral side face portions  356 ,  358  and a generally rectangular bottom face portion  359 . A plurality of flanges  360 ,  362 ,  364  having bores  366 , etc. there through are provided for attaching the forehead plate  350  to a top portion of rack  10  immediately above the uppermost bezel assembly  28  as shown in FIG.  1 . Different height forehead plates may be used depending upon rack  10  configurations or, as shown in FIG. 23 the forehead plate may be eliminated in some embodiments. 
     It is a feature of the bezel assembly  28  that it may be provided in multiple different configurations (e.g.,  411  shown in FIG. 1,  461  shown in FIG. 23 and 501 shown in FIG. 22) by simply changing the appearance of bezel drawer removal plate portion  144 . Drawer bezel assemblies  140  having three different removable plate portions  144  are illustrated in FIGS. 19,  20 , and  21 . In FIG. 19 the removal plate portion  144  is the same as the one shown and described above with reference to FIGS. 10 and 11. It may be seen from FIG. 19 that this configuration  410  of removal plate  144  has a front face portion  412  which includes a flat vertically elongated panel portion  414  and a beveled portion  416  integrally formed therewith. The beveled portion  416  includes a plurality of horizontally extending panel portions having parallel face surfaces  420 ,  422 ,  424 ,  426 , and  428 . Between these paneled portions are horizontally extending front vent openings  419 ,  421 , etc. which correspond to previously described rear vent openings  351 ,  253 , etc. Disposed between horizontally extending panel portions  422  and  424  is a horizontally extending panel portion  430  having a recessed portion  432  therein. Side wall portions associated with horizontally extending panel portions  422 ,  424  have upwardly and downwardly extending recesses therein, respectively. The regions of horizontally extending panel portions  422  and  424  adjacent to recess  430  may thus act as handles into which a user may insert one or more fingers in order to pull open the attached media holding drawer  54 , FIG.  2 . It may be seen from FIG. 19 that a horizontally extending plane of bilateral symmetry  440  divides this first removal plate configuration  410  into mirror image first and second halves  442 ,  444 . As a result of the bilateral symmetry of configuration  410  it is necessary to have only one forming mold for producing removable plate portions  144  for this bezel assembly  28  configuration  411 . The reason is that the removable plate  144  shown in FIG. 19 on a left hand drawer of the housing may be flipped 180 degrees so that lateral side face  238  is positioned on the left hand side thereof rather than the right hand side thereof. The panel portion  144  and this configuration may then be used in association with the right hand drawer. It will also be appreciated that because of the bilateral symmetry of drawer attachable plate portion  142  about a vertically extending plane that it too may be used on either a left hand or right hand drawer. Thus, in order to provide the portion of the bezel assembly  28  position between any two chin plates or a chin plate and forehead plate it is necessary to have only three molds to produce the five different separate plates that form that portion of bezel assembly  28 . In other words, both the left hand and right hand removal plates  144  of configuration  410  may be formed from a single mold and both the drawer attachable plate portions  142  may be formed from a single mold. Central bezel plate portion  270 , of course, also requires a separate mold. FIG. 1 illustrates the bezel assembly  28  configuration  411  in a three stack format  446 . 
     A second configuration  460  of removable drawer plate portion  144 , FIG. 20, is used to provide a second bezel assembly  28  configuration  461 , FIG.  23 . In this embodiment of the removable plate portion  144  a front face portion  462  comprises two outer vertically elongated rectangular panels  464 ,  468  having a plurality of ribs  470 ,  472 , etc. extending horizontally therebetween. The ribs are divided by vent openings  474 ,  476 , etc. Each of the ribs may be generally flat except for the bottom rib  478  which has a partial disk shape which extends outwardly from the other ribs and provides a grippable upper surface  480  and lower surface (not shown) for facilitating opening of the attached medial drawer  54 . This plate has identical lateral side faces  463 ,  465 . This configuration  460  has a vertical plane of bilateral symmetry  484  dividing it into first and second mirror image halves  486 ,  488 . It will be appreciated that because of the bilateral symmetry about vertical plane  484  that configuration  460  may be used in association with either a left hand or a right hand drawer. Thus, the portion of the bezel assembly configuration  461  shown above chin plate  310  in FIG. 23 may also be provided with only three mold cavities. To the extent that a bezel manufacturer is manufacturing the bezel assembly configuration  411  shown in FIG. 1 it will be necessary to produce only a single additional mold in order to provide the bezel assembly shown in FIG. 23 since plate portions  142  and  270  of configuration  461  are identical to those of configuration  411  as are the chin and forehead plates. The plate configuration  460  may also be provided to form a plenum chamber between it and the associated drawer attachable plate portion  142  to provide the same venting capability as that of configuration  410 . FIG. 23 in addition to showing bezel assembly configuration  463  also illustrates an autochanger in a one stack bezel array  50 . 
     FIG. 21 illustrates a removable plate portion  144  in a third configuration  500  which provides a third bezel assembly configuration  501 , FIG.  22 . Third configuration  500  may be essentially identical to first configuration  410  except that the horizontally extending panel and vent arrangement is replaced by a plurality of rectangular holes  502 ,  504 , etc. arranged in a plurality of rows  506 ,  508 ,  510 ,  512 , and columns  514 ,  516 ,  518 ,  520 . A user may stick the tips of her fingers into holes  502 ,  504 , etc. in order to grip plate portion  144  to open the associated media drawer. Third configuration  500  has a horizontal plane of bilateral symmetry of  530  dividing the panel into mirror image first and second halves  532 ,  534 . Like configuration  410  of FIG. 19 this removable plate configuration  500  may be used on the left hand drawer in a first orientation and used on the right hand drawer in a second orientation rotated 180 degrees from the first orientation. FIG. 22 illustrates bezel assemblies  28  mounted in a two stack array  540 . It will of course be appreciated that any of the bezel assembly configurations  411 ,  461 ,  501 , may be provided in a single stack, two stack, three stack, or any other multi stack array. It will also be understood that although specific removable plate portion  144  configurations have been described that any number of configurations could be provided which enable use of the removable plate portion  144  with either a left hand drawer or a right hand drawer so long as the plates have at least one plane of bilateral symmetry passing through them in the directions  173 ,  174  in which the media drawer opens and closes. 
     It is also to be understood that although the specific embodiments disclosed each have a drawer bezel assembly  28  with a drawer attachable plate portion  142  having its viewable face portion  185  positioned below the removable plate portion  144  that the relative position up and down of the drawer attachable plate portion and the removable plate portion could be reversed. It will also be appreciated that any of the drawer bezel assemblies of FIGS. 19 through 21 could be rotated 90 degrees either clockwise or counterclockwise and be vertically elongated and horizontally shorten. Such configuration would also provide the same features of bilateral symmetry within the entire bezel assembly  28 , and ease of modification through changing the removable plate portion, which is provided in the above specifically described embodiments of FIGS. 19 through 21. Also, although the above embodiments have been described with respect to a media autochanger housing  30  having only a single left hand drawer and a single right hand drawer positioned about a central panel these same basic features would be applicable to an autochanger or other device having any number of drawers with or without a stationary central panel. It is to be noted that in all of the bezel configurations  28  shown that the entire bezel configuration  28  has bilateral symmetry about the central vertical plane  271  of the central plate  270 . 
     While illustrative and presently preferred embodiments of the invention have been described above, it should be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims are intended to be construed to include such variations except insofar as limited by the prior art.