Abstract:
A portable information handling system has an automatic latching system that maintains a lid having a display in a desired position relative to a housing, such as a closed position having the lid closed proximate the housing and including a tablet configuration having the display exposed in the closed position. A post automatically extends from the housing into the lid when in the closed position to prevent rotation of the lid. The post automatically retracts into the housing when the lid is in the open position to provide an aesthetically pleasing latch solution for tablet portable information handling systems.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates in general to the field of information handling system convertible lids, and more particularly to a system and method for a self-stowing information handling system lid latch. 
         [0003]    2. Description of the Related Art 
         [0004]    As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to users is information handling systems. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems. 
         [0005]    Increased performance and decreased size of information handling system components have resulted in a trend towards smaller information handling systems having increased processing power. For example, end users have tended to select portable information handling systems as replacements for desktop systems. Portable information handling systems typically include an integrated display and battery so that the system operates free from external connections for power and peripherals. Typically, the display is integrated into a lid that is rotationally coupled to a portable housing. In a closed position, the lid covers the housing to prevent damage to the display as well a keyboard exposed at the upper portion of the housing. In the closed position, the information handling system is in a portable configuration that allows easy transport. Typically, a latch interacts between the lid and housing to secure the information handling system in the closed position. In order to use the information handling system, the latch is released so that the lid rotates to an open position to expose the display and keyboard. 
         [0006]    A modification to the traditional rotational lid and housing has resulted in the development of tablet information handling systems. In a tablet system, the lid rotates approximately 360 degrees so that the system is in a closed configuration with the display and keyboard exposed. Tablet systems typically include a touch screen display that accepts user inputs, such as by handwriting with a stencil on the screen. In addition, tablet systems act as a presentation device since the end user can easily show the display to others. To further improve on the display of information to others, some tablet information handling systems include displays that rotate not only between open and closed positions but also rotate about a central axis running through the middle of the display. For instance, when the lid is open 90 degrees, the end user can rotate the lid about a vertical axis to show the display to individuals sitting across from the end user. Further, once the lid is rotated, the end user can close the lid to form a tablet without rotating the lid a full 360 degrees. One difficulty associated with tablet information handling systems is that rotation about multiple axes requires a latching solution that secures the information handling system in a closed position about each axis. Typically, a latch is used for each axis, however, this requires the end user to activate multiple latches in order to transition to a tablet configuration. Further, conventional latching systems that require multiple end user inputs to transition to a tablet configuration tend to be bulky and are often prominently located along the edge of the housing in a cosmetically unpleasant manner. 
       SUMMARY OF THE INVENTION 
       [0007]    Therefore a need has arisen for a system and method which secures an information handling system lid along plural axes. 
         [0008]    In accordance with the present invention, a system and method are provided which substantially reduce the disadvantages and problems associated with previous methods and systems for securing an information handling system lid to its housing. Posts automatically extend when the lid rotates to a closed position so that rotation about an axis is restricted. The posts automatically retract upon rotation to an open position to remain out of the way of operation of the information handling system. 
         [0009]    More specifically, an information handling system has processing components disposed in a housing and a lid rotationally coupled to the housing. The lid rotates about a horizontal axis between open and closed positions and a vertical axis that changes the direction that a display integrated in the lid points. One or more retractable posts disposed in an opening of the housing are biased into the housing opening by springs. As the lid approaches a closed position, a magnet in an opening of the lid draws the posts out of the housing and into the opening of the lid. The posts prevent rotation of the lid about the vertical axis when the lid is in the closed position. Upon movement of the lid from the closed to an open position, the springs bias the posts to retract into the housing to keep the posts out of the way during use of the information handling system. Openings in opposing sides of the lid accept the posts in both a storage configuration with the display against the housing and a tablet configuration with the display exposed. 
         [0010]    The present invention provides a number of important technical advantages. One example of an important technical advantage is that an information handling system lid is secured along plural axes with a cosmetically pleasing and simple latch. Retractable posts extend between the lid and housing to prevent rotation of the lid when the lid is closed and retract when the lid is open so that the tablet presents an aesthetically pleasing design. When detent hinges maintain the lid in a closed position, an end user can rotate the lid between a tablet configuration and a closed configuration without actuating any latches. Even where a manual latch is used to maintain the lid in a closed position, a single actuation of the manual latch releases the lid to rotate about multiple axes. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]    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. The use of the same reference number throughout the several figures designates a like or similar element. 
           [0012]      FIG. 1  depicts a side view of a portable information handling system with a lid in an open position and operable to rotate about first and second axes; 
           [0013]      FIG. 2  depicts a top view of a portable information handling system with a lid in a closed position and operable to rotate about the second axis; 
           [0014]      FIG. 3  depicts a side view of a portable information handling system in a closed position and having retractable posts to prevent rotation about the second axis; and 
           [0015]      FIGS. 4A and 4B  depict retractable posts in an unlatched position and a latched position. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    An automated latch secures a portable information handling system in a closed position, including a tablet configuration having a display exposed. For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components. 
         [0017]    Referring now to  FIG. 1 , a side view depicts a portable information handling system  10  with a lid  12  in an open position and operable to rotate about first and second axes. Information handling system  10  has plural processing components disposed in a housing  14  that cooperate to process information, such as a CPU  16 , a hard disk drive  18 , RAM  20  and a chipset  22 . Chipset  22  communicates information to a display  24  for presentation to an end user. Display  24  is, for instance, a liquid crystal display (LCD) integrated in lid  12 . Lid  12  is rotationally coupled to housing  14  with a hinge  26  that allows rotation about a first horizontal axis  28  and a second vertical axis  30 . For example, hinge  26  is a detent hinge that includes a detent mechanism for maintaining lid  12  in predetermined positions. For instance, a detent of hinge  26  is set to maintain lid  12  in a closed position when lid  12  is rotated about horizontal axis  28  to place display  24  proximate housing  14 . 
         [0018]    Hinge  26  rotates about vertical axis  30  so that, in the open position, display  24  rotates to face away from the front of housing  14  and the presumed position of an end user. When display  24  is rotated about vertical axis  30  to face the rear of housing  14 , rotation about horizontal axis  28  to a closed position will have display  24  facing outwards from housing  14  in a tablet configuration. Hinge  26  includes a detent to maintain lid  12  in the closed position, both for the storage closed position in which the display is not exposed and in the tablet closed position in which the display is exposed. Referring to  FIG. 2 , a top view depicts a portable information handling system  10  with a lid in a closed position and operable to rotate about the vertical second axis  30 . In the closed position depicted by  FIG. 2 , lid  12  has display  24  exposed in the tablet configuration and not exposed in the storage configuration. Rotation of lid  12  relative to housing  14  is generally not desirable. In order to prevent rotation about axis  30 , a latch is engaged when lid  12  and housing  14  are aligned. Automatic engagement of the latch in either the storage or the tablet configuration to prevent rotation about axis  30  allows end users to select the storage or tablet configuration without a need for manual manipulation of a latch switch. 
         [0019]    Referring now to  FIG. 3 , a side view depicts a portable information handling system  10  in a closed position and having retractable posts  32  to prevent rotation about the vertical second axis. Posts  32  are stored out of sight in openings  34  of housing  14  when lid  12  is in an open position. However, as lid  12  is rotated to a closed position, an opening  34  in lid  12  aligns with the opening  34  in housing  14  and post  32  drawn from within housing  14  and into lid  12 . The insertion of post  32  into opening  34  prevents rotation of lid  12  about the vertical axis  30 . In alternative embodiments, post  32  might instead store in lid  12  and extend into housing  14 . However, placing posts  32  in housing  14  provides the advantage of dual use of a post  32  for maintaining the lid  12  in the closed position for both the storage and tablet configurations. Openings  34  on opposing sides of lid  12  are each aligned to accept the same post  32 . In the storage configuration, openings  34  proximate to the display side of lid  12  accept post  32 . In the tablet configuration, openings  34  on the side of lid  12  opposite the display accept post  32  so that the display is exposed with lid  12  closed against housing  14 . 
         [0020]    Referring now to  FIGS. 4A and 4B , retractable posts are depicted in an unlatched position and a latched position. In the unlatched position of  FIG. 4A , post  32  is biased into opening  34  of housing  14  by a spring  36 . As lid  12  approaches housing  14 , a magnet  38  builds a magnetic attraction with a ferrous material of post  32  to overcome the bias of spring  36  and draw post  32  into the opening  34  of lid  12 , as depicted by  FIG. 4B . In alternative embodiments, a magnet might instead be associated with post  32  to attract to ferrous material in lid  12 , or a magnet might be associated with both post  32  and lid  12 . As post  32  extends from housing  14  into lid  12 , a retaining lip  40  limits the extension to prevent the withdrawal of post  32  from the opening  34  within housing  14 . Thus, post  32  automatically extends when lid  12  is in a closed position to prevent rotation about the vertical axis and retracts when lid  12  is in the open position to limit any interference caused by the latch with the use of the information handling system. Automatic extension and retraction allows an end user to open and close the lid without manual activation of a latch associated with the vertical axis. 
         [0021]    Although the present invention has been described in detail, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims.