Abstract:
A peripheral device mounting apparatus including a peripheral device bay with carrier guides located to accommodate at least two different types of peripheral devices, and a keying mechanism allowing carrier insertion only into certain carrier guides, advantageously provides optimal use of the device bay space for a particular type of peripheral device. Additionally, the keying mechanism prevents installation of a peripheral device into the bay in a location that wastes bay space.

Description:
RELATED APPLICATIONS 
     This application relates to the co-pending U.S. patent application Ser. No. 09/013,956 entitled “Peripheral Device Carrier,” by Ty R. Schmitt, filed the same day as the present application, and incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to computer equipment enclosures, and more particularly to peripheral device bays with guiding features and peripheral device carriers. 
     2. Description of the Related Art 
     Many computer systems, including personal computers, workstations, servers, and embedded systems are designed to have multiple peripheral devices included in the system. A typical personal computer system includes a processor, associated memory and control logic and a number of peripheral devices that provide input and output (I/O) for the system. Such peripheral devices include, for example, compact disk read-only memory (CD-ROM) drives, hard disk drives, floppy disk drives, and other mass storage devices such as tape drives, compact disk recordable (CD-R) drives or digital video/versatile disk (DVD) drives. Additionally, computer systems often have the capability to interface with external enclosures that include additional peripheral devices. 
     In many computer systems, it is desirable to include the maximum number of peripheral devices, e.g. hard drives, that can be enclosed in the chassis of the computer system. Similarly, if an external enclosure is used for hard drives, it is also desirable to design the enclosure to optimize space for the hard drives. One type of computer system where it is particularly desirable to optimize hard drive space is the network server. A network server is a focal point for processing and storage in a network, as the network server is responsible for distribution of application programs and data to client computer systems. Because of resource demands, network servers typically have several hard disk drives contained in a peripheral bay and providing nonvolatile storage for the application programs and data. 
     Additionally, multiple disk drives can be configured to cooperate advantageously using technology generally known as redundant array of inexpensive disks (RAID). RAID systems are particularly useful in the environment of network servers because they provide data redundancy, such that if a single disk drive fails, the data stored thereon can be reconstructed from the data stored on the remaining disks. In the most sophisticated network servers and RAID systems, a failed disk drive can be replaced and the data thereon restored by software without interrupting the server&#39;s operation. In so-called “hot plugging,” the failed disk drive is removed and a new one installed in its place without cutting off the power to the drive or server, and without rebooting the server. A disk drive with this capability is often referred to as “hot-pluggable.” One consequence of using hot-pluggable hard drives is that additional mounting hardware is required in a peripheral bay so that individual drives may be easily inserted and removed. 
     While designers of peripheral bays, computer system chassis, and external peripheral enclosures often seek to accommodate as many of a particular type of device as possible, they also desire the flexibility of accommodating a variety of different types of devices. For example, hard drives come in a variety of heights including one inch and 1.6 inches. A designer of a peripheral bay might choose to include mounting features so that a maximum number of one inch hard drives can be accommodated, for example five one inch hard drives. However, if that same drive bay is used for 1.6 inch hard drives, no more than two such drives can be accommodated using the same mounting features, thereby wasting space and failing to optimize the drive bay. 
     One solution is to have different peripheral bays for different sizes of hard drives. Thus, there would be one peripheral bay optimized for the maximum number of one inch hard drives, and a second peripheral bay optimized for 1.6 inch drive bays. Consequently, the manufacturer of the computer system must be able to install different bays depending on a customer&#39;s drive selection. Additionally, a user who desires to switch from one drive size to another must remove a currently installed peripheral bay, and install a new peripheral bay. Either circumstance leads to additional assembly/modification effort, multiple different peripheral bay parts, and a weaker chassis structure because the peripheral bay must be removable instead of permanently installed in the chassis. 
     Another solution is to use a single drive bay with movable mounting features. For example, a drive bay can have multiple sets of mounting slots to which driver carrier guides are attached. To allow a maximum number of one inch drives, a user or manufacturer places the carrier guides in those mounting slots positioned to allow the maximum number of one inch drives in the drive bay. To allow the maximum number of 1.6 in hard drives, the user or manufacture removes the carrier guides from the mounting slots located for one inch drives, and installs the guides in mounting slots for 1.6 inch drives. Unfortunately, such a peripheral bay system requires added effort on the part of a manufacturer or user to configure or reconfigure a drive bay. Additionally, users and manufacturers must be careful to install certain guides in certain locations, i.e. one can install a guide in a location designated for one inch drives and then mistakenly install the next guide in a location for 1.6 inch drives, thereby wasting drive bay space. 
     Accordingly, it is desirable to have a peripheral device bay for a computer system chassis or external enclosure that will accommodate the maximum number of devices for each of a variety of different types, including sizes, of peripheral devices while simultaneously minimizing the effort required by users and manufactures to configure and reconfigure the bay for different types of peripheral devices. Additionally, it is desirable that possibility of mis-configuration of the bay is minimized. Furthermore, such a bay should utilize peripheral device carriers that are easy to insert and remove from the bay while still allowing optimization of peripheral device bay space. 
     SUMMARY OF THE INVENTION 
     It has been discovered that a peripheral device mounting apparatus including a peripheral device bay with carrier guides located to accommodate at least two different types of peripheral devices, and a keying mechanism allowing carrier insertion only into certain carrier guides, advantageously provides optimal use of the device bay space for a particular type of peripheral device. Additionally, the keying mechanism prevents installation of a peripheral device into the bay in a location that wastes bay space. 
     Accordingly, one aspect of the present invention provides a peripheral device mounting apparatus. The apparatus includes a peripheral device bay having a first plurality of carrier guides on a first interior surface and a second plurality of carrier guides on a second interior surface. The second interior surface opposes the first interior surface, and each of the first plurality of carrier guides corresponds to a parallel opposing carrier guide from the second plurality of carrier guides. A keying mechanism extends along a front edge of the peripheral device bay. The keying mechanism includes a first edge and a first plurality of guiding slots formed along the first edge. The first plurality of guiding slots guide a peripheral device carrier retaining a first type of peripheral device. The keying mechanism is located adjacent to the peripheral device bay so that the first edge prevents the insertion of peripheral device carriers into the peripheral device bay except through the first plurality of guiding slots. 
     In another aspect of the invention, a computer system includes a processor, a memory coupled to the processor, and a chassis supporting the memory and the processor. The chassis includes a peripheral device mounting apparatus. The apparatus includes a peripheral device bay having a first plurality of carrier guides on a first interior surface and a second plurality of carrier guides on a second interior surface. The second interior surface opposes the first interior surface, and each of the first plurality of carrier guides corresponds to a parallel opposing carrier guide from the second plurality of carrier guides. A keying mechanism extends along a front edge of the peripheral device bay. The keying mechanism includes a first edge and a first plurality of guiding slots formed along the first edge. The first plurality of guiding slots guide a peripheral device carrier retaining a first type of peripheral device. The keying mechanism is located adjacent to the peripheral device bay so that the first edge prevents the insertion of peripheral device carriers into the peripheral device bay except through the first plurality of guiding slots. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention may be better understood, and its numerous objects, features, and advantages made apparent to those skilled in the art by referencing the accompanying drawings. 
     FIG. 1 is a perspective view of a peripheral device bay. 
     FIG. 2 is a perspective view of a peripheral device carrier including a one inch hard drive. 
     FIGS. 3A and 3B are perspective views of another peripheral device carrier. 
     FIG. 4 is a perspective view of a keying mechanism. 
     FIG. 5 is a perspective view of an assembled computer system including the device bay, the carrier and the keying mechanism of FIGS. 1,  2 , and  4 , respectively. 
    
    
     DETAILED DESCRIPTION 
     FIG. 1 shows a peripheral device bay  100  designed to contain hard disk drives retained by peripheral device carriers. Bay  100  generally has a box-shaped construction with a front opening allowing the insertion and extraction of peripheral devices. First interior side surface  102  and opposing second interior side surface  104  each have a plurality of carrier guides, for example carrier guides  120 ,  122 ,  124  and  126 . Each carrier guide on the first interior side surface  102  is parallel to and directly opposite from another carrier guide on the second interior side surface  104 . This positioning of carrier guides as well as the use of four carrier guides for each carrier inserted (i.e. two guides from surface  102  and two from surface  104 ) facilitates both the insertion/extraction of peripheral device carriers and secure retention of the carriers. However, bay  100  need not have four guides for each carrier. For example, carrier guide  120  and either one of carrier guides  124  and  126  are sufficient to allow insertion/extraction of a peripheral device carrier. Alternatively, carrier guide  120  can extend further into bay  100 , thereby obviating the need for carrier guide  122 . Moreover, surfaces  102  and  104  need not be parallel as shown, as long as the carrier guides used in the bay continue to accommodate peripheral device carriers. 
     Carrier guides  120 ,  130 , and  140  are located across first interior side surface  102  so as to accommodate a variety of different types of peripheral devices and still provide for optimal use of device bay space. For example, carrier guide  120  (as well as associated carrier guides  122 ,  124  and  126 ) is located to receive a peripheral device carrier that retains either a one inch or a 1.6 in hard drive. When a one inch hard drive retained by a carrier is inserted into carrier guides  120 ,  122 ,  124  and  126 , carrier guide  130  is left unobstructed so that it can receive another one inch drive retained by a carrier. Thus, carrier guides  120  and  130  (as well as other carrier guides in bay  100 ) are located a particular distance from each other so that the bay is optimized to contain the maximum number of one inch hard drives that bay volume will allow. When a 1.6 inch hard drive retained by a carrier is inserted into carrier guides  120 ,  122 ,  124  and  126 , carrier guide  130  and/or other guides associated with carrier guide  130  are obstructed by the carrier and cannot be used. However, carrier guide  140  is located far enough from carrier guide  120  to allow another carrier retaining a 1.6 inch hard drive to be inserted into the bay, thereby optimizing the bay volume for 1.6 inch hard drives. Thus, some carrier guides (e.g. guide  120 ) will accommodate several types of peripheral devices, while other carrier guides (e.g. guides  130  and  140 ) are designed to receive only one type of peripheral device. Nevertheless, the use of a variety of different carrier guides in the same bay permits the bay space to contain the maximum number of either type of peripheral device. 
     Carrier guides can be constructed in a variety of different ways, depending in part on the construction of the carriers used with the bay. For example, carrier guides  120 ,  130 , and  140 , are channels integrally formed from interior side surface  102  of bay  100 . Each guide has a front portion  134  that is wider than the majority of the guide, thereby facilitating insertion of a carrier. Each guide also includes an interior portion  138  easing carrier insertion/extraction and providing support for the inserted carriers. Consequently, the carrier guides shown in FIG. 1 have a substantially U-shaped cross section. Those of ordinary skill in the art will readily recognize that a variety of different carrier guide designs can be used including rails, groves formed by pairs of rails or lances, slots, and the like. 
     Peripheral device bay  100  includes a variety of mounting features including mounting brackets  110 , mounting lug  115 , and tabs  150 . Mounting brackets  110  allow bay  100  to be fastened to a chassis or housing, such as chassis  510  of FIG.  5 . Alternatively, the drive bay can be an integral feature of a chassis, thereby obviating the need for mounting brackets  110 . Tabs  150  and mounting lug  115  serve as mounting features for a printed circuit board (not shown) interfacing peripheral devices to other devices such as power supplies or a processor of a computer system. Bay  100  is preferably constructed from sheet metal, but may be formed from any other suitable material such as plastic. 
     FIG. 2 illustrates a peripheral device carrier  200  for retaining peripheral devices (e.g. one inch high hard drive  260 ) for installation into peripheral device bay  100 . The carrier includes a base  210 , peripheral device mounting features  220 , lever  230 , and clip  240 . Base  210  has two edges  250  which fit into the guides of bay  100 , thereby allowing the carrier to be smoothly inserted and extracted from the carrier. Lever  230  is rotatably coupled to a front portion of the base by hinge  255 . Lever  230  need not be coupled directly to the base, but should be rotatable with respect to the base in order to allow a user to easily insert and extract the carrier. Base  210  can be, for example, a metal plate, plastic, or a printed circuit board. Lever  230  is preferably constructed from plastic, but can also be constructed from a variety of suitable materials including metal. 
     One end of lever  230  includes a deflectable locking tab  232  that is deflectable in a direction along the length of the lever. Deflectable locking tab  232  is flexible enough so that when the lever is pushed toward the carrier, the locking tab can be deflected toward the opposite end of the lever, thereby allowing the locking tab to be received by clip  240  as the locking tab deflects down and into clip opening  245 . When locking tab  232  is engaged by clip  240 , the lever is in a closed position, and thus lever  239  and clip  240  form a handle by which carrier  200  can be carried. When locking tab  232  is not engaged by clip  240 , lever  230  it is said to be in an open position. Ribs  233  provide a textured surface for users to actuate the deflectable locking tab using, for example, a thumb. Those having ordinary skill in the art will readily recognize that a variety of different selectively engageable schemes can be used allowing the lever to be opened and closed and providing secure retainment. Lever  230  also includes a grip  234  with a recess  235 . Recess  235  is sized to receive one or more fingers so that a user can readily grasp lever  230 . Grip  234 , recess  235 , and locking tab  232  are located so that opening and closing the lever can be accomplished using one hand. For example, a user can open the lever by sliding their index finger into the recess and simultaneously using their thumb to depress locking tab  232 . Once the locking tab is released from clip  240 , lever  230  can be pulled away from the carrier, rotating about hinge  255 . 
     Lever  230  alo includes engaging portion  236  having first and second camming surfaces  237  and  238 . For insertion of carrier  200 , lever  230  is rotated so that it is approximately parallel with carrier edge  250  and the carrier is inserted into bay  100  along the carrier guides. The carrier moves into the bay until first camping surface  237  makes contact with a camming edge located along the front of the peripheral device bay. The camming edge can be a feature of the drive bay, a feature of the chassis in which the drive bay is mounted, or an edge  410  or  410  of the keying mechanism shown in FIG.  4 . As the first camming surface  237  comes into contact with the camming edge, carrier alignment features such as alignment pin  280  and/or connectors (not shown) can engage or begin to engage a printed circuit board located at the rear of the peripheral device bay. As lever  230  is rotated toward the carrier, second camming surface  238  engages the camming edge and acts to lever the carrier into the bay. Insertion is complete when clip  240  engages locking tab  232 , thereby securing the lever between clip  240  and the camming edge. Additionally, as the carrier is secured into the bay, any connection between the carrier and/or the device retained by the carrier and the printed circuit board at the rear of the bay is completed. 
     To remove carrier  200  from device bay  100 , the lever is unlocked from clip  240  by depressing deflectable locking tab  232  and pulling the lever away from the carrier. First camming surface  237  engages the camming edge, levering the carrier out of the bay. Alternatively, a third camming surface  239  can engage a surface of the drive bay or chassis to lever the carrier out of the bay. Once the carrier is released from the bay and any connectors on the carrier are disconnected from the printed circuit board at the rear of the bay, the carrier can be pulled out of the bay by lever  230 . Whether during insertion or extraction, the camming action of engagement portion  236  and the overall performance of carrier  200  is enhanced by the width of the engaging portion. Those having ordinary skill in the art will readily recognize that engaging portion  236  can utilize a variety of different features to help secure carrier  200  into a bay including, for example, a hook or a single flat surface. Additionally, the camming edge can take a variety of forms including a lip, a ledge, a rib, a protrusion, and even a surface. 
     Lever  230  also includes a cosmetic surface  270  upon which cosmetic features, e.g. an embossed or molded logo, can be located. Clip  240  can be a separate part coupled to base  210 , and need not be integrally formed from the base as shown in FIG.  2 . Additionally, although peripheral device mounting features  220  are shown as lugs integrally formed from the base and including through holes for fasteners, a variety of mounting features can be used, and the mounting features need not be formed from the base. Carrier  200  can also be used to retain more than one type of peripheral device. For example, FIG. 2 shows carrier  200  retaining a one inch hard drive  260 , but the same carrier can retain a 1.6 inch hard drive. A face plate or filler panel (not shown) can also be included with carrier  200  located, for example, along the width of the carrier, i.e. perpendicular to edge  250 , between hard drive  260  and clip  240 . Such a face plate or filler panel can serve as an additional cosmetic surface or as a plate covering open spaces in the bay. 
     FIGS. 3A and 3B illustrate another peripheral device carrier  300 . Carrier  300  includes a base  310 , a handle  315  coupled to the base, peripheral device mounting features  320 , and a lever  330 . Base  310  has two edges  350  which fit into the guides of bay  100 , thereby allowing the carrier to be smoothly inserted and extracted from the carrier. Lever  330  is rotatably coupled to handle  315  through hinge  355  and is rotatable with respect to the base. 
     One end of lever  330  includes a deflectable locking tab  332  that is deflectable in a direction along the length of the lever. Deflectable locking tab  332  operates in a manner similar to deflectable locking tab  232  and can be retained by a clip (not shown) in handle  315 . When locking tab  332  is engaged by the clip, the lever is in a closed position, and when the locking tab is not engaged by the clip, the lever is said to be in an open position. Ribs  333  provide a textured surface for users to actuate the deflectable locking tab using, for example, a thumb. Lever  330  also includes a grip  334  with a recess  335 . Recess  335  is sized to receive one or more fingers so that a user can readily grasp lever  330 . Grip  334 , recess  335 , and locking tab  332  are located so that opening and closing the lever can be accomplished using one hand Once the locking tab is released from the clip, lever  330  can be pulled away from the carrier, rotating about hinge  355 . 
     Lever  330  also includes an engaging portion  336  that allows carrier  300  to engage and disengage a camming edge depending upon movement of lever  330 , and keeps the carrier secured in a peripheral device bay when the carrier is fully inserted and the lever is place in its closed position. Cosmetic features can be located on cosmetic surface  370 . Additionally, handle  315  includes light pipes  325  that extend from the front of the carrier to the rear of the carrier. Light pipes  325  bring light from hard disk drive  260  or from a printed circuit board located along the rear of a peripheral device bay to the front of the carrier where it can more easily be seen. For example, light pipes  325  can be positioned to receive light from light emitting diodes (LEDs) mounted on hard drive  260  or a printed circuit board. Such LEDs can indicate, for example, drive activity and device failure. Light pipes  325  are commonly formed from a clear plastic or glass. A face plate or filler panel (not shown) can also be included with carrier  300  attached, for example, to handle  315 . Such a face plate or filler panel can serve as an additional cosmetic surface or as a plate covering open spaces in the bay. 
     Referring to FIG. 4, a keying mechanism  400  is shown that is used in conjunction with a device bay like device bay  100  to facilitate placement of carriers in the proper carrier guides given the type of device retained by the carriers. Keying mechanism  400  typically extends along a front edge of a peripheral device bay (See FIG.  5 ). Keying mechanism  400  has a first edge  410  and a second edge  420 . Edges  410  and  420  are shown as parallel opposing edges, but need not be so. For example, keying mechanism  400  can have a shape similar to an angle iron or bracket wherein the first edge and the second edge are perpendicular to each other and meet at a common comer. Edge  410  includes guiding slots  415  spaced apart so that carriers can only be inserted in carrier guides the are aligned with the guiding slots. For example, guiding slots  415  are positioned to correspond to the carrier guides that are used when filling a peripheral device bay with the maximum number of carriers (here four) retaining 1.6 inch hard drives. Similarly, edge  420  has guiding slots  425  positioned to correspond to the carrier guides that are used when filling the peripheral device bay with the maximum number of carriers (six) retaining one inch hard drives. Thus, a peripheral device mounting apparatus including a peripheral device bay  100  and a keying mechanism  400  controls which configuration of drives is used. 
     Keying mechanism  400  includes mounting features such as mounting slots  430  and mounting holes  440 . These mounting features allow the keying mechanism to be removably attached to a device bay or chassis so that the appropriate edge can be located (i.e. by changing the orientation of the keying mechanism) to guide peripheral device carriers into the peripheral device bay. Keying mechanism  400  can also include guiding tabs (not shown) to help position the keying mechanism with respect to the chassis or drive bay before fasteners secure it to the chassis or bay. As previously noted, edges  410  and  420  can serve as camming edges for peripheral device carriers  200  and  300 . 
     FIG. 5 shows a computer system  500  including chassis  510 , door  520 , peripheral device bay  100 , peripheral device carrier  200 , and keying mechanism  400 . Door  520  includes a key lock assembly  524  and attaches to chassis  510  via hinges  528 . Examples of key lock assembly  524  and hinge  510  are found in U.S. Patent application Ser. No. 09/013,767 entitled “Combination Keylock Device and Securing Device,” by Ty R. Schmitt, filed on the same day as the present application, and incorporated herein by reference. 
     Peripheral device bay  100  is shown attached to chassis  510 . This can be accomplished by, for example, riveting bay  100  to the chassis using bay mounting brackets  110 . Chassis  100  also includes guiding slots  530  similar to the guiding slots  419  and  425  of keying mechanism  400 . However, chassis  510  has guiding slots  530  that correspond to each of the carrier guides of bay  100 , and not merely selected carrier guides, as is the case with guiding slots  415  and  425 . Keying mechanism  400  is located along the lower front edge of bay  400 , but with edge  410  obstructing carrier insertion into the bay except through guide slots  415 . Because keying mechanism  400  is oriented as shown, carriers can only be inserted into carrier guides corresponding to the optimal installation of carriers retaining 1.6 inch hard drives. Carrier  200  is shown installed in bay  100  and retaining a 1.6 inch hard drive. Keying mechanism  400  is shown attached to the chassis using hooks  540  that are received by mounting slots  430 , however the keying mechanism can be attached to the chassis using a variety of different features including, for example, mounting holes  440 . 
     Although the examples shown in FIGS. 1-5 illustrate peripheral devices that are hard disk drives, it will be apparent to those of ordinary skill in the art that a variety of different peripheral devices can take advantage of the peripheral device bay, keying mechanism, and peripheral device carriers disclosed in this application. Additionally, other devices associated with computer system operation, for example removable power supplies, may also benefit from the bay, keying mechanism, and carriers described herein. 
     The description of the invention set forth herein is illustrative and is not intended to limit the scope of the invention as set forth in the following claims. Variations and modifications of the embodiments disclosed herein may be made based on the description set forth herein, without departing from the scope and spirit of the invention as set forth in the following claims.