Abstract:
A computing device is provided herein. For instance, the computing device comprises base and lid assemblies, and a connector. The base assembly includes a base housing, a first hinge portion attached to the housing, a keyboard, a touch-based input surface, and an electronic component within the housing. The housing includes a first surface at least partly surrounding the keyboard and touch-based input, and a second opposing surface. The lid assembly includes a lid housing, a second hinge portion, and a display, and includes a first surface at least partly surrounding the display and a second surface opposite the first surface. The connector has a third hinge portion, a fourth hinge portion and a body extending therebetween. The third hinge portion is rotatably affixed to the first hinge portion of the base assembly, and the fourth hinge portion is rotatably affixed to the second hinge portion of the lid assembly.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of the filing date of U.S. Provisional Patent Application No. 61/587,914 filed Jan. 18, 2012, the disclosure of which is hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Tablet and notebook computers are designed to be portable computing devices with specialized functionality. Notebook computers are designed to replicate the functionality of a desktop computer with a computer monitor in the form of a display screen integrated with traditional input in the form of a keyboard and trackpad. These components are often configured in a “clamshell” configuration wherein the screen in positioned in a lid housing that is rotatably affixed opposite a base housing that includes the keyboard and the trackpad (or other similar input) as well as other internal computer components. Clamshell computers can be “closed” for transportation and storage and can be opened with the keyboard, trackpad, and screen facing the user such that the screen is adjustable by tilting the lid housing. 
     Tablet computers often include a single body with internal computer components and a touch-sensitive screen at an external surface thereof. The touchsreen allows the user to interact with the display using touch with either the user&#39;s fingertips or a stylus. Tablets are generally intended for use on a flat surface or while being held by the user. Various cases, stands or other attachments can be used to hold a tablet in various other positions that users have found useful. The lack of a fixed keyboard, however, limits the use of tablet-type computers, particularly in their ability to facilitate the creation of content that requires a great deal of typing. Further, in some applications, interaction with the screen itself interferes with the user&#39;s ability to view the information on the screen. However, the simple design and potentially intuitive nature of tablet interfaces makes them desirable for other types of content creation and for content consumption. 
     Due to the distinct inherent advantages of each type of portable computer, attempts have been made to develop computers that can be reconfigured between traditional notebook computer modes and tablet modes. However, such attempts lack many functional aspects that are advantageous for users of those devices during use as either a tablet or notebook computer or during transition between such modes. 
     BRIEF SUMMARY 
     According to one aspect, a computing device is provided. The computing device comprises a base assembly, a lid assembly, and a connector. The base assembly includes a base housing, a first hinge portion attached to the housing, a keyboard, a touch-based input surface, and an electronic component within the housing. The housing further includes a first surface at least partly surrounding the keyboard and the touch-based input and a second surface opposite from the first surface. The lid assembly includes a lid housing, a second hinge portion, and a display. The lid housing includes a first surface at least partly surrounding the display and a second surface opposite the first surface. The connector has a third hinge portion, a fourth hinge portion and a body extending therebetween. The third hinge portion is rotatably affixed to the first hinge portion of the base assembly, and the fourth hinge portion is rotatably affixed to the second hinge portion of the lid assembly. 
     In one example, the body of the connector is rotatably affixed to the base housing by the rotatable affixation of the first hinge portion with the third hinge portion such that the connector is rotatable through about 180 degrees with respect to the base housing. In another example, the body of the connector is rotatably affixed to the lid housing by the rotatable affixation of the second hinge portion with the fourth hinge portion such that the connector is rotatable through about 180 degrees with respect to the lid housing. 
     In a further example, the lid housing is rotatably affixed to the base housing by the rotatable affixation of the first hinge portion with the third hinge portion and the affixation of the second hinge portion with the fourth hinge portion such that the lid housing is rotatable through about 360 degrees with respect to the base housing. In this case, the connector may be configured such that rotation of the lid housing relative to the base housing also causes translation of the lid housing in a direction perpendicular to the first surface of the base housing. Here, when the lid is rotated by 360 degrees with respect to the base housing, the lid may translate in the direction perpendicular to the first surface of the base housing through a distance approximately equal to a thickness of the base housing plus a thickness of the lid housing. 
     In another example, the device can be configured in a closed position such that the first surface of the lid housing faces the first surface of the base housing and such that the screen, keyboard, and touch-based input are not accessible for contact therewith by a user. In one alternative, the body of the connector includes an outside surface that is perpendicular to the second surface of the lid housing when the device is in the closed position. In another alternative, the computing device further includes retention means that are mutually engageable between the base housing and the lid housing to maintain the device in the closed position. 
     In yet another alternative, the device is further configurable in an easel position such that the first surface of the lid housing is positioned at an angle of between 310 and 330 degrees with respect to the first surface of the base housing. And when in the easel position, the device is positionable on a surface such that a front edge of the base housing and a front edge of the lid housing contact the surface. In this case, the device may further include retention mechanisms attached between each of the first and third hinge portions and the second and fourth hinge portions, the retention mechanisms being configured to releasably secure the notebook in the easel position. Here, the retention mechanisms may include a depression and a raised portion, each being respectively associated with the first or third and the second or fourth hinge portions, the depression and raised portion being mutually engagable when the device is moved into the easel position. Optionally, the raised portion is spring-biased. 
     In another example, the device is further configurable in a tablet position such that the second surface of the lid housing faces the second surface of the base housing and such that the screen and keyboard are exposed on opposite sides of the device. In this case, the electronic component may include a sensor configured to determine when the device is in the tablet position and to output a signal in response thereto, the component further including a processor adapted to receive the signal from the sensor and executing a command to disable a keyboard function in response thereto. Here, the device may further include a gyroscopic sensor configured to determine an orientation of the device, wherein the processor is further adapted for executing a command to utilize the gyroscopic sensor to orient an image presentable on the display in response to the determined orientation upon receiving the signal from the sensor. 
     And in another alternative, the connector includes means for synchronizing rotation of the lid with respect to the connector with rotation of the base with respect to the connector. 
     According to another aspect, a computing device comprises a base assembly, a lid assembly and a connector. The base assembly includes a base housing, a keyboard, a touch-based input surface, and an electronic component within the housing. The housing further includes a first surface surrounding the keyboard and the touch-based input and a second surface opposite from the first surface and defining a front edge of the base housing. The lid assembly includes a lid housing, and a display. The lid housing includes a first surface surrounding the display and a second surface opposite the first surface and defining a front edge of the lid housing. The connector is rotatably affixed between the base assembly and the lid assembly to alternately permit rotation of the lid assembly with respect to the base assembly and to retain the device in an easel position such that the first surface of the lid housing is positioned at an angle of between 310 and 330 degrees with respect to the first surface of the base housing. And when in the easel position, the device is positionable on a surface such that a front edge of the base housing and a front edge of the lid housing contact the surface. 
     In one example, the front edge of the lid housing and the front edge of the base housing are adjacent front surfaces of the lid housing that are angled with respect to their respective first surfaces to be parallel to a surface when the device is positioned thereon. In another example, the base assembly includes a first hinge portion, the lid assembly includes a second hinge portion, and the connector has a third hinge portion, a fourth hinge portion and a body extending therebetween, wherein the third hinge portion is rotatably affixed to the first hinge portion of the base assembly, and wherein the fourth hinge portion is rotatably affixed to the second hinge portion of the lid assembly. 
     In yet another example, the device further includes retention mechanisms attached between each of the first and third hinge portions and the second and fourth hinge portions, the retention mechanisms being configured to releasably secure the notebook in the easel position. 
     In a further example, the electronic component includes a sensor configured to determine when the device is in the easel position and to output a signal in response thereto. Here, the component further includes a processor adapted to receive the signal from the sensor and executing a disabling command to ignore at least one of a keyboard and a trackpad function in response thereto. In one alternative, the processor is further adapted to receive an override command for the disabling command. And in another alternative, the processor is further adapted for executing a display orientation command in response to the determined orientation upon receiving the signal from the sensor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a computer according to an aspect of the present disclosure in a first configuration; 
         FIG. 2  shows the computer of  FIG. 1  in a further configuration; 
         FIG. 3  shows the computer of  FIG. 1  in another configuration; 
         FIG. 4  shows the computer of  FIG. 1  in yet another configuration; 
         FIGS. 5A-5C  show side views of the computer of  FIG. 1  in the configurations of  FIGS. 2 ,  3 , and  4 ; 
         FIG. 6A  shows a front view of the computer of  FIG. 1  in a further configuration; 
         FIG. 6B  shows a rear view of the configuration of  FIG. 6A ; 
         FIG. 6C  shows a side view of an alternative axample of a computer according to an aspect of the disclosure; and 
         FIG. 7  shows an exploded detail view of a portion of the computer of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure are described herein with reference to the drawing figures.  FIG. 1  illustrates an example of an embodiment of a notebook computer  10  that has many aspects thereof, including a base unit  12  and a lid unit  30  that is connected to the base unit  12  in such a way that the lid  30  is rotatable with respect to the base  12 . The base unit  12  includes a base housing  14  that includes a lower surface  16  and a deck surface  18  that is opposite and generally parallel to lower surface  16 . Input devices, which can include a keyboard  20  and a touch-based input such as a trackpad  22  (which can also be referred to as a touchpad or the like) can be affixed to the base housing  14  and exposed for access by a user on deck surface  18 . The base housing  14  can also include additional components of computer  10  such as various electronic structures including the computer&#39;s central processing unit, various internal memory structures, batteries, graphics cards, cooling mechanisms, and structures for making various external connections with the computer&#39;s internal components (including a power port, USB, firewire, or thunderbolt ports, audio input and output ports, and slots for receiving additional memory cards or the like). The base housing  14  can also include openings appropriate for access to such connection structures. 
     Lid unit  30  includes a lid housing  32  that has an upper surface  34  and a bezel surface  36 . A display unit  38 , that can be in the form of an LCD, LED, OLED, or AMOLED video display or the like, can be attached to lid housing  32  that is exposed for viewing by the user at the bezel surface  36  such as through an opening therein. Display  38  can be in the form of a touchscreen configured to simultaneously present a viewable image and receive touch-based inputs from a user along the viewing surface thereof. The touchscreen, in connection with specialized software in the computer&#39;s memory, can detect user touch and movement thereacross as well and can recognize various “clicks” and other gestures made by the user on the screen. Various known touchscreen configurations can be used for display  38  including those with capacitive, resistive, or surface acoustic wave sensing structures. 
     The rotatable attachment of lid unit  30  to base unit allows for the computer  10  to be configured in different positions, including a “closed” position, as shown in  FIG. 2 , in which the bezel surface  36  is placed adjacent to deck surface  18  with the upper surface  34  of the lid housing  32  and lower surface  16  of the base housing  14  generally parallel to each other and spaced apart over a total thickness of the computer  10 . This configuration can be used during storage or transportation of computer  10 , as it is a compact position with display  38 , keyboard  20 , and touchpad  22  protected from accidental actuation or damage during transpiration. During use, the lid unit  30  can be rotated with respect to the base unit  12  into any of an infinite number of positions that position the display  38  facing the user in a comfortable viewing position for the user with the base unit  12  resting on a surface or supported by the user (such as on the user&#39;s lap) with the keyboard  20  and touchpad  22  positioned for use. Such a configuration is shown in  FIG. 1  and is generally referred to herein as a “laptop” configuration. 
     In the present example, lid unit  30  is affixed to base unit  12  by a multi-hinge connector  50  that is configured to allow lid unit  30  to rotate beyond a range generally used in the laptop configuration and up to 360° with respect to the base unit  12 . This allows computer  10  to be positioned in additional configurations that are described herein. An example of a hinge mechanism including an exemplary connector  50  is shown in  FIG. 1 . In the present example, a single connector  50  has a body  52  that extends across a majority of the width of both the lid housing  32  and the base housing  14 . The body  52  of connector  50  is received within cutouts  54  in the lid housing  32  and the base housing  14 . The cutouts  54  can be appropriately shaped to allow for the desired rotation between lid unit  30  and connector  50  as well as between base unit  12  and connector  50 . 
     In the example shown in the Figures, computer  10  can include a single connector  50  that extends along at least about 60% of the width thereof. In a further example, connector  50  can be centered with respect to base  12  and lid  30  and can extend through up to at least about 90% of the width thereof. Cutouts in lid housing  32  and base housing  14  can be sized to correspond to the width of connector  50 . The use of a single connector that extends through at least 60% of the width of the computer  10  can provide desirable levels of stability in the connection between base  12  and lid  30 . Additionally, such a connector  50  can provide adequate internal space to house various electronic components, such as WiFi antennas or the like. In another example, connector  50  can be adequately sized to provide a dock for a stylus or the like that can be used in connection with screen  38  such that stylus can be available for removal from connector  50  when computer  10  is at least in the tablet configuration ( FIG. 4 ), but is enclosed within computer  10  when in the closed configuration. In other embodiments, multiple connectors can be used that have narrower bodies than shown in the figures. Such connectors can be spaced apart along multiple locations through the width of the lid and base assemblies that can have multiple cutouts to accommodate the connectors. 
     Connector  50  in the present example is rotatably affixed to lid housing  32  at the lateral ends of the connector  50 . Further, connector  50  is rotatably affixed to the base housing  14  in locations that mirror the connection between connector  50  and lid housing  32 . Connector  50  is sized to extend between lid housing  32  and base housing  14 , as shown in  FIG. 2 , when computer  10  is in the closed configuration. The connections between the connector  50  and the lid  32  and base housings  14 , respectively can be centered at a halfway point between the thickness of each housing  14 , 32  with the overall height of connector  50  being sized to accommodate such a connection arrangement. The connector arrangement shown can permit computer to be positioned in the laptop and closed configurations described above and shown in  FIGS. 1-3 . 
     Additionally, the rotational attachment between lid unit  30  and base unit  12  using connector  50  can allow for additional usage configurations. As shown in  FIG. 3 , lid unit  30  can be rotated 180° with respect to base unit  12  (as measured between bezel surface  36  and deck surface  18 ) such that upper surface  34  of lid housing  32  and lower surface  16  of base housing can both lie along a surface. It is noted that in an embodiment where base housing  14  includes elastomeric feet  28  or the like along lower surface  16 , lid housing  32  can also include feet (not shown) on upper surface  34  thereof such that lower surface  16  and upper surface  34  are substantially flush. In an embodiment where lid housing  32  and base housing  14  have a generally equal thickness, bezel surface  36  and deck surface  16  can also be substantially flush when computer  10  is in the flat position, although arrangements where lid housing  32  is thinner than base housing  14  are possible. 
     As shown in  FIG. 4 , the above-described hinge mechanism including connector  50  or variations thereof can allow lid unit  30  to be rotated to 360° from the closed position and into the “tablet” configuration shown. In this configuration, both the lid unit  30  and the base unit  12  are inverted such that the upper surface  34  of the lid housing  32  is adjacent the lower surface  16  of base housing  14  with bezel surface  36  and deck surface  18  being positioned on the outside of the computer  10 . In this configuration, computer  10  can be used as a tablet device where the user interacts with the touchscreen display  38  with the keyboard  20  and trackpad  22  facing away from the user. In this configuration computer  10  can be held by the user or can be positioned on a surface. Features (not shown) similar to feet  28  can also be positioned on deck surface  18  for use in such a configuration (and to appropriately space apart bezel surface  36  and deck surface  18  when the computer  10  is closed). Further, it may be advantageous for keyboard  20  and trackpad  22  to be somewhat recessed relative to deck surface  18  to prevent damage thereto when computer  10  is positioned on a surface in the tablet configuration. 
     As shown in  FIGS. 5A-5C , the configuration of connector  50  can accommodate the full 360° rotation of lid unit relative to base unit  12  due to the spacing between its connections with lid housing  32  and base housing  14 , respectively. As shown, the connection point  62  of connector  50  to base housing  14  and the connection point  64  of connector  50  with lid housing  32  are each positioned at about the halfway point through the thickness of the lid housing  32  and the base housing  14 , respectively. Further, the connection points  62 , 64  can be spaced apart vertically when the computer  10  is in the closed position ( FIG. 5A ) at a distance  66  that is at least equal to half of the overall thickness of the computer  10 . This distance can be slightly greater to accommodate tolerances or to accept any spacers or feet on either bezel surface  36  of deck surface  18 . When the computer  10  is moved into the flat configuration ( FIG. 5B ), the distance  66  between connection points  62 , 64  can horizontally space apart lid unit  30  and base unit  14  to allow them to rest flush on a common surface. Further, when in the tablet configuration ( FIG. 5C ), the lid unit is translated vertically compared to when in the closed position by the rotation of connector  50 , the translation being equal to the distance  66 . 
     Computer  10  can also be configured in an “easel” configuration by positioning lid unit  32  relative to base unit  12  such that display  38  faces away from keyboard  20  but such that the computer  10  is not yet in the tablet configuration. For example, the easel configuration can be such that bezel surface  36  is at an angle of between about 310° and 330° with respect to the deck surface  18 . This configuration can position the respective top-front and bottom-front edges of the lid housing  32  and the base housing  14  at a distance sufficient to give computer  10  a base that can support it in the upright position shown in  FIGS. 6A and 6B  with connector  50  positioned vertically at the top of the configuration. This can allow for use of the computer as a tablet through interaction with the touchscreen display  38  while the computer is in a self-supported position with the display  38  elevated. This configuration can be used to display video, slideshows or the like with keyboard  20  and trackpad  22  out of the way. It can also allow for self supported use in tight spaces. 
     Various examples of computer  10  can include features to help maintain the position in the easel configuration against the weight of computer  10  and against the force of the user&#39;s interaction with touchscreen display  38 . For example, as shown in  FIG. 6C , the front surfaces  127  and  145  of base housing  114  and lid housing  132 , respectively, can be angled such that they can be parallel to a surface  102  (such as a desktop or the like) when computer  110  is positioned thereon in the easel configuration. Additionally or alternatively, the front surfaces  127 , 145  or the edges  129 , 144  thereof can include elastomeric members configured to increase friction with a surface to help hold the easel position. 
     The hinge mechanism can also include mechanical features to help maintain the easel position. An example of such a feature is shown in  FIG. 7 , where the connector is shown having a boss  56  that engages with a hole  42  formed by lid housing  14 . Other features or mechanisms can be used to rotatably connect connector  50  to lid housing  14 , and the example shown can also include additional components or features such as washers, bearings, or other components to control the friction within the hinge mechanism. The features can also include cable routing or heat transfer features between connector  50  and lid unit  30 . Similar features can connect connector  50  to base housing  14  and can further include cable routing or heat transfer features between connector  50  and base unit  12 . 
     In the example shown, boss  56  can include a spring-biased or resiliently deformable pawl  58  that can extend beyond the radius of boss  56  and can be depressed to recede into boss  56 . Hole  42  can include one or more detents  60 , e.g.,  60 A and  60 B, that are sized to receive pawl  58  when in the extended position. This arrangement can be such that boss  56  can rotate freely within hole  42  with boss held in the depressed position by the wall of hole  42 . When lid unit  30  is rotated such that detent  60  aligns with pawl  58 , pawl  58  will move into its natural extended position and into detent  60 . The outwardly-biased force of pawl  58  can increase the amount of force to rotate lid unit  30  in either direction to an amount greater that the friction of the hinge assembly alone. Similar features can be implemented between the connector  50  and the base housing  14  such that various positions between connector  50  and base unit  12  can be similarly maintained. 
     In the example shown in  FIG. 7 , hole  42  includes multiple detents  60  that can provide retention forces for multiple positions, such as those discussed above. Detent  60  A is positioned to align with pawl  58  when the lid unit  30  is positioned at 90° with respect to the back surface  53  of the connector. If a detent  60  is similarly positioned between connector  50  and base housing  14 , then the result can be to help maintain computer  10  in the closed position. Detent  60 B can be positioned along hole  58  at a location between about 155° and 165° relative to detent  60 A. When similarly implemented in the base (in essentially a mirror-image position about horizontal plane), the arrangement can help maintain computer  10  in a desired configuration for the easel configuration. For example, if an easel position is desired wherein the bezel surface  38  is at an angle of 320° with respect to the deck surface  18 , detent  60 B can be positioned such that pawl  58  will engage detent  60 B after rotation of lid housing  32  form the closed position relative to connector  50  through an angle of 160°. Similarly positioning a corresponding detent in base housing  14  can provide for the desired easel position retention. Additional detents can be included to provide similar retention of computer  10  in the flat (clockwise 90° from detent  60 A) and tablet (180° from detent  60 A) configurations. 
     Alternative structures can be used to attach lid housing  32  or base housing  14  to connector  50 , which can include alternative retention features with similar geometric locations or similar structural principles. The hole  42  and boss  56  can be reversed with the hole positioned in connector  50 , for example. Further, both the lid housing  32  and connector  50  can include holes with single or the like extending therethrough. Such a rod can extend completely through connector  50  and into a mating hole on the opposite side of lid housing  32 . In such an arrangement, the retention features can, for example, be included within connector body  52 . Such attachment features can further be linked such as by gears or the like, which can be contained within housing  32 , so as to cause lid unit  30  to rotate relative to connector  50  at the same rate as connector  50  relative to base unit  12  when, for example, a user moves lid unit  30 . 
     Computer  10  can have various forms of software or firmware stored in its memory that can implement various functions or execute various commands that can enable improved use of computer  10  when configured in or moved between the various positions described herein. In an example software stored in the memory of computer  10  and configured to be run by the processor of computer  10  can control the orientation of the image presented on display  38  or enable and disable keyboard  20  or trackpad  22  depending on the position of computer  10 , as determined by various sensors or switches from which the processor collects information. 
     In an example, a sensor, such as a magnetic sensor can be positioned in base housing  14 , for example within the attachment to connector  50 . A series of magnets can also be positioned within the mating attachment feature in connector  50  at locations determined to correspond to the position of computer  10  based on the degree of rotation of connector  50  relative to base unit  12 . Based on the information collected from the sensor, the software, which can be a part of the computer&#39;s operating system or within application-specific software, can, for example, orient the display  38  image in an upright position when the computer is in the laptop position. The software can also enable the keyboard  20  and trackpad  22  for normal use. When the computer  10  is in the closed position, the software can cause the display  38  as well as the keyboard  20  and trackpad  22  to be deactivated. 
     In further examples, when the software determines that the computer  10  is in the flat position (as shown in  FIG. 3 ), the display can be reoriented for viewing by a person positioned opposite from base unit  12 , which can include rotating the display 180° from the orientation in the laptop position. Alternatively, the display can be oriented at 90° in either direction from the orientation in the laptop position. Either of these re-orientations can be done automatically accordingly to system, software, or user preferences or by a command executed by a user response to a prompt presented in response to the software&#39;s position determination. An additional prompt can allow the user to cause the software to display a virtual keyboard on the display to allow simultaneous input by two users on opposite sides of base unit  12 . 
     When the software has determined that the computer  10  is in the easel position (as shown in  FIGS. 6A and 6B , above) can also rotate the display to 180° from the orientation in the laptop configuration. This can be done automatically based on the feedback from a sensor to sense the laptop position (as described above, for example, or based on feedback from an additional sensor in lid unit  30  that is enabled when the computer  10  is in the easel position. The gyroscopic sensor can be configured to determine the orientation of the lid unit  30  and can appropriately orient the display based thereon according to known conventions. This can allow for viewing of an upright image in the landscape mode when in the orientation shown in  FIG. 6A . It can also re-orient the display  38  image when computer  10  is rotated 90° from the  FIG. 6A  position (with deck surface  18  placed on a work surface) in an elevated tablet position. It can also orient the display  38  image in a portrait mode when the computer  10  is stood upright in the easel position (resting on its sides) in a “book” mode. Any of these re-orientations can be done automatically based on position sensing or upon user-selection or confirmation upon a prompt in response to position sensing. 
     The position sensing described above can also cause the keyboard  20  or trackpad  22  to be disabled when the computer is in the easel position to prevent accidental or unintentional actuation thereof. Various actions can override this disabling to enter into a “presentation mode” or the like. Such actions can include a double-click on the trackpad or spacebar, for example, or depressing a specific key combination, or depressing a virtual button on the touchscreen display  38 . In the presentation mode, the keyboard and trackpad can be active to allow a presenter on the keyboard  20  side to control images presented on display  38  to others. 
     When the software determines that computer  10  is in the tablet mode, it can allow gyroscopic display orientation, as described above, and can disable the keyboard and trackpad to allow the user to hold computer  10  without actuating either input. 
     Although the description herein has been made with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present disclosure. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present disclosure as defined by the appended claims.