Abstract: A monitoring/control plug-in unit for a connection electrical enclosure comprises functional elements and allow the connection and possibly the operation and/or the surveillance of an electrical load. The monitoring/control plug-in unit able to move within the connection electrical enclosure between an operation position and a test position. The plug-in unit comprises a locking system, which comprises an electromagnetic lock. A control circuit board of the drawer control the functional elements and the electromagnetic lock. The locking system of the plug-in unit is configured to allow the monitoring/control plug-in unit to be locked in the test position or in the operation position independently of the functional elements contained in the plug-in unit, and prior validation of the correct operation of the plug-in unit and/or of the electrical load is needed for unlocking the plug-in unit, this validation being performed by the control circuit board and allowing the electromagnetic lock to be unlocked.

Abstract: According to one embodiment, a server chassis for immersion cooling includes a chassis frame having a chassis base and an adjustable server panel coupled to the chassis base to receive a server blade to be mounted on the adjustable server panel. The server blade includes a first portion and a second portion. The first portion has a first set of electronic components and the second portion has a second set of electronic components. The adjustable server panel is adjustably mounted along the chassis base, such that when the server chassis is deposited into a container having two-phase coolant therein, the first set of electronic components is at least partially submerged into a liquid region filled with the two-phase coolant, and the second set of electronic components is positioned within a vapor region above an immersion line defining the liquid region and the vapor region.

Abstract: A method is provided for positioning a data center rack relative to a rack-supporting frame. The method includes connecting at least one front attachment member to the data center rack on a front side thereof such that part of one of the at least one front attachment member and part of one of the at least one front attachment member extend leftward from a left end and rightward from a right end respectively of the data center rack; lifting and inserting the data center rack between a left and a right vertical support units until the at least one front attachment member abuts the left and right vertical support units; and moving the data center rack leftward or rightward until a hook portion of the at least one front attachment member engages the left or right vertical support unit to set a lateral position of the data center rack.

Abstract: Certain aspects of the present disclosure include a support frame having a rear side, a bottom section, a connector bracket, a first perimeter section, a second perimeter section, and a rotatable bracket. The bottom section defines a width of the support frame. The connector bracket extends upright from the bottom section. The first perimeter section and the second perimeter section extend upright from opposing ends of the bottom section. The first perimeter section and the second perimeter section are substantially parallel to the connector bracket. The rotatable bracket is rotatably coupled at one end to the first perimeter section. The rotatable bracket is configured, at another end, to removably couple to the connector bracket, thereby enclosing an opening when the rotatable bracket is in a closed configuration. The opening is defined by the first perimeter section, a portion of the bottom section, the connector bracket, and the rotatable bracket.

Abstract: A rack adapting device for an electronic equipment rack is disclosed. The electronic equipment rack is configured to house first electronic equipment modules having a first module width between left and right equipment supports laterally spaced apart from one another by a rack housing width corresponding to the first module width. The rack adapting device is configured to adapt the electronic equipment rack to house a plurality of second electronic equipment modules having a second module width and comprises: an adapter body; a plurality of rack-engaging features disposed on a first lateral side thereof and configured to engage rack mounting features of one of the left and right equipment supports; and a plurality of adapter mounting features disposed on a second lateral side such that, in use, the second electronic equipment modules are mounted between the rack adapting device and an other one of the left and right equipment supports.

Abstract: An electronic device may have a glass housing structures. The glass housing structures may be used to cover a display and other internal electronic device components. The glass housing structure may have multiple glass pieces that are joined using a glass fusing process. A peripheral glass member may be fused along the edge of a planar glass member to enhance the thickness of the edge. A rounded edge feature may be formed by machining the thickened edge. Raised fused glass features may surround openings in the planar glass member. Multiple planar glass members may be fused together to form a five-sided box in which electronic components may be mounted. Raised support structure ribs may be formed by fusing glass structures to a planar glass member. Opaque masking material and colored glass may be used to create portions of the glass housing structures that hide internal device components from view.

Abstract: A card connector, a card holder, and a terminal device, where the card connector includes a plurality of first terminals and one or more second terminals. The first terminals are arranged to form a first card access area that installs a first card, and the first terminals are configured to be electrically coupled to the first card. The one or more second terminals are distributed on a periphery of the first card access area, the first terminals and the one or more second terminals form a second card access area that installs a second card, and the first terminals and the one or more second terminals are configured to be electrically coupled to the second card.

Abstract: An electronic equipment assembly has an interconnect including columns of signal conductors, connectors mounted to the columns of signal conductors, and a chassis coupled with the interconnect. The chassis provides slots that guide resource devices into engagement with the connectors mounted to the columns of signal conductors to enable the interconnect to electronically access the resource devices. At least one column of the columns of signal conductors of the interconnect is a multi-function column. Each multi-function column is constructed and arranged to electronically access different types of resource devices through a respective connector mounted to that multi-function column.

Abstract: An explosion-proof enclosure includes a front cover (first housing half or portion) and a rear cover (second housing half or portion) joined together by a retention member inserted into a passageway at least partially formed by structures of both the front cover and the rear cover. The enclosure includes an internal chamber for containing an associated electronic device. The passageway generally extends peripherally about the internal chamber. In one exemplary embodiment, the retention member is a ball-chain and the passageway completely surrounds the internal chamber such that respective end portions of the ball-chain overlap. A sealing element is provided for sealing respective mating surfaces of the front cover and rear cover. In another example, the retention member is a rigid split retention member.

Abstract: Provided is a disaggregated memory server, which in some examples is a rack-mounted hardware appliance comprising a pool of memory for allocation to memory clients. Examples of memory clients may include one or more rack-mounted computing devices co-located on a rack with the disaggregated memory server. The disaggregated memory server may be optimized for high-speed dynamic memory allocation to the other computing devices in the rack.

Abstract: A fluid connector includes an adapter panel defining at least two mounting holes configured to be secured to a mounting rail of a server chassis. The fluid connector also includes an interior connector configured to fluidly communicate with a cooling module of a server, and a blind mate connector extending from the adapter panel and configured to fluidly connect with a port of a rack manifold.

Abstract: An audio network box is provided as a master for a networked speaker system. The audio box can be configured with different combinations of modules to provide functionality as may be desired by an end user. The modules may include a power over Ethernet module, a wireless communication module/access point (AP) module, and an analog speaker module.

Abstract: A circuit board fall-out prevention structure includes: a housing; a circuit board fitted to the housing in an insertable and extractable manner; an insertion and extraction lever supported with a shaft rotatably with respect to the circuit board and capable of being hooked on the housing to facilitate an insertion and extraction operation of the circuit board; and a recess-protrusion capable of being hooked between the insertion and extraction lever and the circuit board after insertion of the circuit board in a direction different from an insertion and extraction direction of the circuit board.

Abstract: An explosion-proof enclosure includes a front cover (first housing half or portion) and a rear cover (second housing half or portion) joined together by a retention member inserted into a passageway at least partially formed by structures of both the front cover and the rear cover. The enclosure includes an internal chamber for containing an associated electronic device. The passageway generally extends peripherally about the internal chamber. In one exemplary embodiment, the retention member is a ball-chain and the passageway completely surrounds the internal chamber such that respective end portions of the ball-chain overlap. A sealing element is provided for sealing respective mating surfaces of the front cover and rear cover. In another example, the retention member is a rigid split retention member.

Abstract: A function expansion device and an electronic device including the same. The function expansion device includes a casing, an expansion device and a handle. The casing has a main space and a side space. The expansion device is accommodated in the main space of the casing. The handle is slidably disposed in the side space and is thus allowed to move between a housed position and an extracted position along a sliding direction of the casing by gravitational force. A first protruding length of the handle relative to the casing when the handle is at the housed position is less than a second protruding length of the handle relative to the casing when the handle is at the extracted position. When the handle is at the extracted position, the handle is pressed against the casing to enable the casing to be moved along with the handle.

Abstract: The multiple redundancy position sensor device intended for detecting the position of a shifter lever in a shifter device, comprises a first magnetic sensor and a second magnetic sensor facing the first magnetic sensor, one of the sensors being a dual die magnetic sensor. A polarized magnet is arranged between the sensors such that the polarized magnet can be rotated with at least one degree of freedom. A signal based on the angular position of the polarized magnet relative to the first magnetic sensor and the second magnetic sensor corresponding to a shifter lever position is output to control a vehicle transmission.

Abstract: Disclosed herein is an oven including a display module. The oven includes a main body and a display module pivotably installed on the main body, wherein the display module includes a fixed module fixedly coupled to the main body, a moving module pivotably coupled to the fixed module and including a display panel provided to be manipulated by a user, a driving module and disposed on the fixed module and configured to generate a driving force such that the moving module is pivoted, and a detection module including a press pin configured to detect a position of the moving module depending on whether or not the press pin is pressurized.

Abstract: The side profile of a hard drive assembly may be configured with one or more open areas to allow cooling air to pass side-to-side through a lateral flow channel provided by a cavity defined in the base portion of the hard drive assembly. Corresponding and complementary open areas may be also be defined in mating drive carrier assembly side components to allow passage of lateral side-to-side cooling air through the base portion flow channel of a hard drive assembled to the drive carrier assembly to form a mountable hard drive system that is installed into a storage enclosure. The at least partially aligned open flow areas of the assembled hard dive assembly and drive carrier assembly may cooperate to reduce air flow impedance across multiple rows of hard drive systems through a storage enclosure.

Abstract: Cable backplane systems and communication devices are provided according to examples of the present disclosure. In one aspect, a cable backplane system includes a frame and a cable unit; the cable unit includes a first connector array, a second connector array and communication cables; the first connector array is fixed on the frame, wherein a first connector in the first connector array is connected with a first plug-in card, first connectors in a same row are connected with a same first plug-in card; the second connector array is fixed on the frame, wherein a second connector in the second connector array is connected with a second plug-in card, second connectors in a same column are connected with a same second plug-in card; and the communication cables is connected with the first connector array and the second connector array.

Abstract: The present disclosure relates to a modular sensory immersion system including one or more panels that introduce the tactile component of audio vibration from multi-media formats into the various surface areas of the human body, while synchronized with audio to the ears. In certain embodiments, the modular sensory immersion system also delivers a range of additional haptic and multi-sensory stimuli synchronized to audio and audio-visual content. In one embodiment, each panel houses vibrating transducers and associated electronics to deliver the audio synchronized force feedback vibrations, as well as the mechanical components associated with the delivery air busts of ambient or heated/cooled variety, water streams and mists, fragrances, and solid or semi solid projectiles. The system can be used as a single interactive panel, as a multi-panel platform, or a multi-panel platform with attached paneled walls that deliver all of the above mentioned sensory stimuli.

Abstract: A battery pack includes a fixing part, and more particularly, a battery pack includes a fixing member and a fixing part, which fix an entire structure in top/bottom, left/right, and front/rear directions. A space defined in the battery pack is filled. As such, the battery pack may provide a power source that is safe against vibration, has a high capacity, and is fast in assembling.

Abstract: A drive latch apparatus may include a latch coupled to a chassis such that the latch secures a hard drive to the chassis. The apparatus may also include a handle coupled to a proximal end of the latch such that compressing the handle unlocks the latch from the chassis. In addition, the apparatus may include a drive holder coupled to a distal end of the latch such that a distal end of the drive holder bends under the hard drive to unseat the hard drive and the drive holder slides vertically from the chassis in tandem with the latch. Various other apparatuses, systems, and methods are also disclosed.

Abstract: The present disclosure discloses an expansion bus device that is communicatively coupled to a plurality of input-output devices. The expansion bus device includes a plurality of input-output slots, via which the plurality of input-output devices are coupled to the expansion bus device. The expansion bus device also includes a retimer switch communicatively connected to each of the plurality of input-output slots. The retimer switch supports switching between the plurality of input-output slots.

Abstract: A plug-in module (100), has a first side face (110), a first elastic strip (10) and a first pull tab (20) provided at a same end of the first side face; the first elastic strip has an elongated shape, and is provided with at least one first limiting lug (11) on a first surface of the first elastic strip opposite to the first side face, an end of the first elastic strip located in close proximity to the first pull tab is referred to as an opposite end, another end of the first elastic strip is referred to as the distal end, and the distal end and the first side face are affixed together. The opposite end is provided with an elastic strip retraction head (12), and the elastic strip retraction head is provided in correspondence with the first pull tab. Further provided is a smartboard. The plug-in module can be conveniently plugged in and unplugged, simplifying user operations and improving user experience.

Abstract: The present disclosure relates to a protective relay. According to the present disclosure, the handle is fixed or separated by a lever structure rather than a gear structure, so that the user may easily fix or separate the handle to or from the outer casing. Therefore, convenience and operability of the user are improved.

Abstract: A combiner-positioning apparatus for a vehicular head-up display is provided. The combiner-positioning apparatus includes a drive unit for supplying a driving force, a combiner assembly including a combiner, the combiner being projected and exposed to an outside or retracted or hidden into a slot formed in a dashboard by the driving force, a guide unit for guiding sliding movement of the combiner assembly in a vertical direction, and a power transmitter for transmitting the driving force to the combiner assembly.

Abstract: In one implementation, a system for a tool-less multipoint latching mechanism includes a number of adjustable cams of a bracket to interact with a number of corresponding cam surfaces located on a computing board, a number of locking locations to couple a printed circuit assembly (PCA) to the bracket, and a number of pin-in-slot joints of the bracket that interact with the number of adjustable cams to vertically lower the coupled PCA into a number of receiving connectors on the computing board.

Abstract: A server comprises case, first storage module, second storage module and at least one third storage module. The case comprises base plate and two side plates. The base plate has first side, second side and fourth side. The first side is opposite to the second side. The third side and the fourth side are located between the first side and the second side, and the third side is opposite to the fourth side. Two side plates respectively stand on first side and second side. The first storage module is fixed to case and located between third side and fourth side. The second storage module is located between first storage module and fourth side and movably disposed on the case. The at least one third storage module is located between the second storage module and the fourth side and movably disposed on the case.

Abstract: An apparatus of sliding a submodule includes a sliding rail part installed on one side of a cabinet; a submodule capable of being entered into or withdrawn from the cabinet; and a sliding guide part installed at one side of the submodule and slidingly moved by the sliding rail part. The sliding rail part may include a rail body, first and second extending parts extending from opposite ends of the rail body, and first and second sliding rails connected to the first and second extending parts respectively and protruding toward the sliding guide part.

Abstract: Mechanical mounting devices for an electronic housing in a frame are provided, the electronic housing comprising a front face, a rear face, a bottom and two lateral faces, the frame comprising an opening. The electronic housing comprises, on each lateral face, a mechanical cam having a quarter-circle form, one of the two ends of the cam being terminated by a triangular point the end bearing the point being disposed close to the bottom, the second end being disposed along the front face. The bottom of the frame comprises a bottom abutment parallel to the front face. The opening of the frame comprises two guiding pins disposed on either side of the uprights of the opening and arranged such that each cam can be displaced in rotation on the pin which corresponds to it during the phase of mounting of the electronic housing in the frame.

Abstract: Electrical equipment, in particular for aircraft, comprising: a fixed frame delimiting a storage compartment having a front opening, a pivoting frame mounted to pivot on the fixed frame to occupy a storage position in which it is placed inside the storage compartment of the fixed frame and an accessibility position in which it extends through the front opening of the fixed frame, the pivoting frame delimiting a reception space having at least one access opening, situated behind its front, for the introduction of electronic cards and their removal when the pivoting frame is in said accessibility position in which said access opening is situated in front of said front opening of the fixed frame, the pivoting frame being provided with electrical connection means that can be coupled to electrical connection means of the electronic cards.

Abstract: A manufacturing method of a bottom chassis includes providing a base plate having a flexibility and a first rigidity through a press molding process, providing a bent-maintaining member having a second rigidity greater than the first rigidity and being curved in a first direction through an extrusion molding process, and coupling the base plate to the bent-maintaining member.

Abstract: A server capable of rotating and accessing storage devices accommodated therein includes a server chassis, a motherboard, a power supply module, two racks, and a system cooling module. The server chassis includes two side plates and an accommodating space between the two side plates. The power supply module is disposed in the accommodating space and arranged corresponding to the motherboard. The racks are arranged parallel to each other and detachably connected to the server chassis. A pivot structure and a handle for operating the rack are disposed at the rack near the motherboard. The rack is rotatable with respect to the server chassis by means of the pivot structure. The system cooling module is disposed adjacent to the rack. At least one cord passage is provided between the system cooling module and each of the side plates.

Abstract: Swing arm assemblies for providing access to wiring enclosures are described that provide convenient one handed operation and the ability to temporarily fix the enclosure at a telescoped height and optionally in a rotated position.

Abstract: An example module is provided herein. The module includes a tray and a cable support member. The tray includes a cage, a handle mechanism, a tray handle, and a tray midplane. The cage receives an electronic component and the handle mechanism rotates the cage using a cage lever and a cam member between a closed position, a top open position, and a bottom open position. The tray handle releases the tray from an engaged position. The tray midplane provides a connector for the electronic component. The cable support member provides a movable connection between the tray midplane and an enclosure backplane.

Abstract: An adjustable support for multi-axis is adapted for a host device where at least one element is installed. The adjustable support for multi-axis comprises a base, at least one installation element and a support element. The base comprises an installation portion and a slide-guiding portion. The installation portion is located at one end of the base, and the slide-guiding portion is located at the center of the base. The installation element is disposed on the installation portion for being detachably attached to the host device. The support element is adjustably disposed on the slide-guiding portion. When the support element is fixed, one end of the support element is capable of supporting the at least one element. When adjusting the position of the support element, the support element is capable of moving on the slide-guiding portion and rotating about the slide-guiding portion.

Abstract: A card ejector comprising a pair of tapered lever arms coupled at a proximal end of the card ejector and coupled at a distal end of the card ejector, a cam block coupling the pair of tapered lever arms at the proximal end of the card ejector, the cam block operable to be rotatably coupled to a card and to engage a card cage, the cam block operable to urge the card into or out of the card cage when a rotational force is applied to the card ejector, and a latching mechanism coupling the pair of tapered lever arms at the distal end of the card ejector, the latching mechanism operable to automatically and releasably secure the distal end of the card ejector in a position near a face portion of the card by engaging an opening in the face portion.

Abstract: A power supply includes a main body having a coupling face and a handlebar. The coupling face includes a first end and a second end forming a power socket. The handlebar includes a first beam coupled to the first end and a second beam. The first beam extends a tab outwardly. The handlebar defines a window configured to expose the power socket. The handlebar is transitionable between: (i) a first configuration in which the second beam couples the second end, the window corresponds and exposes the power socket, the tab extends toward a first direction, and (ii) a second configuration in which the second beam is remote from the second end, the window is remote from the power socket, and the tab extends toward a second direction different from the first direction. A method for removing the power supply from a case of an electronic device is also provided.

Abstract: Embodiments of the present disclosure provide techniques and configurations for a rack assembly. In one embodiment, a tray to be disposed in a rack assembly may comprise a plurality of sleds with individual sleds including one or more compute nodes; and a networking element coupled with a sled of the plurality of sleds and configured to communicatively connect the sled to one or more other components of the rack assembly via an optical communication system. The optical communication system may include an external optical cable configured to communicatively connect the networking element with the rack assembly. Other embodiments may be described and/or claimed.

Abstract: A universal load control module may include a power supply that operates over a wide voltage range, a microcontroller, and one or more functional control blocks. A functional control block may include a dimmer circuit for controlling a lighting load that provides reverse phase cut mode dimming, forward phase cut mode dimming, and hybrid phase cut mode dimming, as well as thermal protection. One or more universal control modules may be housed in a cabinet that include a cabinet control module. The cabinet may include additional thermal protection measures.

Abstract: According to one embodiment, a docking station for a portable device is provided with an improved latching mechanism for securing the portable device within the docking station. In general, the latching mechanism may comprise a pivotable lever and a larch assembly that operate together as a cam-follower mechanism. The pivotable lever may have a curved lower surface and contoured upper surface, and may be generally configured to rotate about a rotational axis when a back surface of the portable device contacts and pushes against the curved lower surface of the pivotable lever. The latch assembly may be generally configured to translate a rotational motion of the pivotable lever into a linear motion, which causes a hidden latch portion of the latch assembly to extend out of the docking station for securing the portable device within the docking station.

Abstract: A positioning structure (10) of an electrical peripheral device (100) includes a positioning plate (101). The positioning structure (10) includes a fastening seat (1) having an engaging portion (11), and a rotating piece (2) pivoted around and rotating with respect to the fastening seat (1). The rotating piece (2) has a latching portion (21) and a detent part (22) at one end thereof. When the latching portion (21) is latched to the engaging portion (11), the detent part (22) presses and locks the top of the position plate (101) correspondingly Thus, the installation and uninstallation of the electrical peripheral device (100) are made efficient and the convenience of using the positioning structure (10) is improved.

Abstract: A disk drive carrier includes a frame and a shuttle. The frame includes supports configured to be in physical communication with a disk drive, a first index tab to align the disk drive with a connector on a backplane of a server tray, and an arm configured to engage the disk drive with the connector in a horizontal orientation. The shuttle includes a base including a channel, edges extending from the base and forming an enclosure to receive the frame and the disk drive in a vertical orientation, a fastener connected to the server tray through the channel, and an alignment key configured to slide along the first index tab and to align the disk drive with the connector. The disk drive shuttle is configured to horizontally move along the server tray and to enable the disk drive to connect with the connector in the horizontal orientation.

Abstract: A curved frame for securing a display panel includes two long-side frame parts having a curved shape, each of the two long-side frame parts including a groove member provided through each of edge portions thereof and a first coupling hole defined to penetrate the groove member, and two short-side frame parts having a straight line shape, each of the two short-side frame parts including a protruding member provided in correspondence with the groove member of the two long-side frame parts and a second coupling hole defined to penetrate the protruding member, each of the two short-side frame parts being coupled to the two long-side frame parts to define a rectangular frame shape.

Abstract: A self-supporting server chassis accepts blade server computing devices, and other like computing devices and associated infrastructure hardware, and also provides structural support for vertical stacking of such self-supporting server chassis, thereby eliminating the need for conventional racks. Internal support structures, such as rails, holes and standoffs, accept and provide physical support for the computing devices and other infrastructure hardware. Vertical stacking support structures provide physical stability and rigidity for stacking multiple self-supporting server chassis in a vertical direction, and allow interconnection among self-supporting server chassis. Stacks of self-supporting server chassis can comprise a base member with casters or other like transportation hardware, as well as a top member that provides further structural stability and rigidity, as well as providing cooling and airflow benefits, such as airflow containment.

Abstract: The side profile of a hard drive assembly may be configured with one or more open areas to allow cooling air to pass side-to-side through a lateral flow channel provided by a cavity defined in the base portion of the hard drive assembly. Corresponding and complementary open areas may be also be defined in mating drive carrier assembly side components to allow passage of lateral side-to-side cooling air through the base portion flow channel of a hard drive assembled to the drive carrier assembly to form a mountable hard drive system that is installed into a storage enclosure. The at least partially aligned open flow areas of the assembled hard dive assembly and drive carrier assembly may cooperate to reduce air flow impedance across multiple rows of hard drive systems through a storage enclosure.

Abstract: An electronic device includes a blade having a faceplate and a handle out locked position ejector. The handle out locked position ejector is configured to secure the blade to a chassis. The handle out locked position ejector includes two ejectors and a handle binding the two ejectors together. The handle out locked position ejector extends perpendicularly from the faceplate when the blade is secured to the chassis thus locating the handle out of the way of ports of the blade.

Abstract: Described is a lightweight and durable storage device comprising a main enclosure of rigid material with interior partitions (FIG. 18), a hingedly attached and lockable access door panel (210) (119), an infinitely designable cosmetic door cover (113), a means for securing the enclosure to a fixed surface (111), a self contained unit for charging electronic items stored inside the enclosure (1410), a means for exterior venting (218), an exterior attachment (114) and means for securing larger items outside the enclosure (1210), and a non-abrasive surface material (1810) applied to high use areas of the enclosure.

Abstract: Two system boards may be connected by a blind plug connector assembly. The top system board supports a first connector and has a hole adjacent the first connector that secures a guide bracket. The blind plug connector assembly is selectively received in the guide bracket to position a proximal connector on the assembly for connecting to the first connector on the top system board and position a distal connector on the assembly for connecting to a second connector on the lower system board. A flexible wired connection extends within the assembly between the proximal connector and the distal connector, and may form a scalability cable. The interaction between the assembly and the guide bracket provide alignment of the connectors.

Abstract: The present invention provides a joined back panel structure of display device, which includes: a first mounting member that is L-shaped and a second mounting member, a third mounting member, a fourth mounting member, and a fifth mounting member that are linear, ends of the first mounting member, the second mounting member, and the third mounting member are sequentially connected to form an enclosed outer frame, the fourth mounting member being disposed inside the outer frame and having two ends connected to the outer frame, the fifth mounting member being disposed inside the outer frame and having two ends connected to the outer frame so as to form a hollow back panel. The outer frame of the present invention has an improved structural strength and low cast and is easy to manufacture.