Abstract:
The present invention provides for a wall mountable system for automated drawing of an image upon a wall which includes a horizontal mounting track for mounting on a wall, a robot having a y-track rigidly mounted it where the robot and the mounted y-track travel along the horizontal track. An end effector, which includes a pen holding mechanism holding a pen, is in electrical communication with the robot and travels along the y-track of the robot. The present invention provides a system and device that can attach to a wall or vertical surface in a damage-free manner and draw fast any complexity or style image of custom size in both the horizontal (X) and vertical (Y) directions, that is easy to remove and transport and require small floor space to operate.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of U.S. Provisional Application No. 62/331,637, having a filing date of May 4, 2016, the disclosure of which is hereby incorporated by reference in its entirety and all commonly owned. 
     
    
     FIELD OF INVENTION 
       [0002]    The present invention relates to an apparatus for fast outlining and drawing images on a vertical surface. More specifically, the present invention relates to a microcontroller-based apparatus for damage-free mounting to a vertical surface for drawing images based on an uploaded digital file, and expandable in both the horizontal (X) and vertical (Y) directions to accommodate any image size. The apparatus is designed for ease of assembly/disassembly, for ease in transportation and requires substantially less floor space to operate it. 
       BACKGROUND 
       [0003]    Homeowners and businesses use murals to personalize their space and create a unique atmosphere. Custom product and services oriented businesses, like wood shops, manufacture unique custom parts out of various materials. Theaters require custom sets to be made for new shows. Industries, architecture firms, universities use white/black boards to draw variety of schematics, plans, landscape layouts and drawings to make an active discussion of their projects. However, to create custom mural, part or template on a large scale either takes artistic skills or requires an outline. Few number of artists can free hand a large-scale mural but their time and availability is cost prohibitive to most businesses and homeowners. The said artist also specializes in a certain style, which may not align with the desired outcome. A number of techniques have been developed to create outlines on a large scale: stencils, image projection and grids. 
         [0004]    Stencils can be used to aide in wall art outline and are transposed to a wall. However stencils are usually time consuming and tedious to make. They have limitations on complexity and styles. Image projection uses a type of projector to display an image on to a surface, and the image size may be adjusted. However image projection still requires the outline to be drawn by a person, which is a tedious and time consuming task. Moreover, image projection can be timely as a result of blocking the projected image while the artist draws and image projection is limited by ambient light conditions. A grid, a horizontal and vertical lines at equal distances superimposed on an image, can be drawn to aid in creating the outline. It is extremely difficult, tedious, requires high artistic skill and time consuming task. Graphical plotting alleviates these shortcomings. 
         [0005]    There are three categories of Graphical plotting devices: (1) Roller, (2) Bed/Table and (3) Wire/Cable. The Roller type prints an image on paper that feeds from a roller. A pen carriage moves along a rectilinear travel path as the paper passes through the plotter. The Bed/Table type has a fixed bed or table and a pen carriage that can move in various directions over the bed surface. One drawback to both types (1) and (2) is that they are physically limited by the size of the paper or bed/table, respectively. Moreover, these types of devices cannot mount to a wall nor print directly to the wall. In general, these devices are not portable. These devices cannot draw an outline on a piece of wood or be used in small shops to create custom parts out of non-paper material. To outline an image on a non-paper material requires specialized equipment with high cost and such equipment require large floor space. The Wire/Cable type, however, can be directly attached to a vertical surface but the Wire/Cable robots are very slow, which is problematic to use for practical applications, especially for outdoor graphical plotting. Thus there remains an unmet need for a device that can attach to a wall or vertical surface in a damage-free manner and draw fast any complexity or style image of custom size in both the horizontal (X) and vertical (Y) directions, that is easy to remove and transport and require small floor space to operate. 
       SUMMARY OF INVENTION 
       [0006]    The present invention seeks to solve the unmet needs noted herein. Notwithstanding, additional advantages may be afforded by one or a combination of embodiments presented herein in excess of what has been described herein, thus nothing herein is intended to limit the advantages or solutions to problems in the field of graphical plotters that the present invention solves. In solving the unmet need, that present invention provides at least a device that can attach to a wall or vertical surface in a damage-free manner and draw fast any complexity or style image of custom size in both the horizontal (X) and vertical (Y) directions, that is easy to remove and transport and require small floor space to operate. 
         [0007]    The present invention provides for a wall mountable system for automated drawing of an image upon a wall which includes a mounting track for mounting on a wall, a robot for traveling along said mounting track, said robot further comprising a y-track rigidly mounted to said robot, said y-track extending from the robot and perpendicular to the mounting track; and an end effector, said end effector traveling along the y-track of said robot, said end effector further comprising at least one pen, wherein said pen is selected from the group consisting of: stylus, a pen, a pencil, a marker, a crayon, chalk, charcoal, painting tool, paint pen, laser cutter, laser diode, engraving device, glass etching, router, mechanical cutter or combinations thereof. It is intended that the mounting track is mounted horizontally to a wall wherein said wall is selected from the group consisting of: interior/exterior wall, wood panel/wall, concrete wall, glass, plastic, chalk board, metal sheet, plywood, paper, cardboard or any combinations thereof. 
         [0008]    The present invention provides additional unique features by providing, for example, an expandable mounting track having a first end, a second end and an intermediate extent therebetween. Novel mounting tracks are further used, for example one embodiment employs mounting tracks that are mounted to the wall using a damage-free adhesive, or in other embodiments using at least one adjustable extension pole angularly positioned between the mounting track and the ground to provide both horizontal and vertical support to the horizontal rack to maintain the horizontal track against the vertical surface. 
         [0009]    The robot further includes certain novel features. For example in at least one embodiment, the robot includes wheels or gears that can attach to and engage with the mounting track. In addition in some embodiments, the y-track rigidly mounted to the robot is also extendable. The robot in certain embodiments utilizes a communication means to control the position of the end effector along the y-track. For example in at least one embodiment the robot transmits power and communicates to the end effector using a conductive wire or strips along the y-track. 
         [0010]    The robot, the horizontal track (x-track), the vertical track (y-track), the end effector, the mounting tracks, and the system, in general, contain additional elements, embodiments and features, each further described herein. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]    For the present invention to be clearly understood and readily practiced, the present invention will be described in conjunction with the following figures, wherein like reference characters designate the same or similar elements, which figures are incorporated into and constitute a part of the specification, wherein: 
           [0012]      FIG. 1  is a front view of the entire system when it is set up and hanging on vertical surface  600 . 
           [0013]      FIG. 2  illustrates a blown up view of an intermediate extent  105  of the mounting track  100 . 
           [0014]      FIG. 3  illustrates a blown up view of the mounting brackets  50  that will attach the mounting track  100  to a wall  600 . 
           [0015]      FIG. 4  is a blown up view of the robot  200  with the cover removed as to show the various components that the robot  200  is comprised of. 
           [0016]      FIG. 5  is a front view of the y-track  300  with intermediate extents  305 . 
           [0017]      FIG. 6  illustrates a blown up view of the end effector  400  and a perspective view of one at least one embodiment of a drawing tool attached to the end effector  400 . 
           [0018]      FIG. 7  is a rotated view of the end effector  400  without the pen. 
           [0019]      FIG. 8A  is an exploded view of a plurality of mounting tracks  100  which can be assembled to form a custom length track.  FIG. 8B  is an assembly view of the plurality of mounting tracks to form a single track. 
           [0020]      FIG. 9  illustrates a perspective view of the bottom bracket  500  illustrating its constituent elements. 
           [0021]      FIG. 10  illustrates a top view of the mounting bracket(s)  50  mounted to an uneven mounting surface keep the mounting track  100  straight. 
           [0022]      FIG. 11  is a detailed view of the y-track  300  and the inside parts of the end effector  400 . 
           [0023]      FIG. 12  illustrates a perspective view of the bottom bracket  500  with a wheel  508  for stabilization of y-track. 
           [0024]      FIG. 13  is one embodiments of a top perspective view of the robot  200  and mounting track  100 . 
           [0025]      FIG. 14  is one embodiments of a bottom perspective view of the robot  200  and mounting track  100 . 
           [0026]      FIG. 15  illustrates alternative non-damage method for fast mounting of the system on the wall. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]    The following detailed description is merely exemplary in nature and is in no way intended to limit the scope of the invention, its application, or uses, which may vary. The invention is described with relation to the non-limiting definitions and terminology included herein. These definitions and terminology are not designed to function as a limitation on the scope or practice of the invention, but are presented for illustrative and descriptive purposes only. 
         [0028]    Various terms used throughout the specification and claims are defined as set forth below as it may be helpful to an understanding of the invention. 
         [0029]    As used herein a “pen” shall mean a pen, a pencil, a marker, a crayon, chalk, charcoal, painting tool, paint pen, laser cutter, laser diode, engraving device, glass etching, router, mechanical cutter or combinations thereof. 
         [0030]    As used herein a “wall” shall mean a vertical surface that can be interior/exterior wall, wood panel/wall, concrete wall, drywall, glass, plastic, chalk board, metal sheet, plywood, paper, cardboard or any combinations thereof. Vertical surfaces can also hold raw materials such as paper, metal sheet, cardboard, etc on a wall and be drawn on or combinations thereof. 
         [0031]    As used herein a “drawing” shall mean drafting, outlining, plotting, engraving, etching, cutting, burning or drawing or combinations thereof. 
         [0032]    As used herein a “servo” shall mean servo motor, a servo, a stepper motor, a motor (DC or AC), or combinations thereof. 
         [0033]    A mountable system for automated drawing of a digital file upon a wall is provided on  FIG. 1 . The system includes a mounting track  100  for mounting on a wall  600 , a robot  200  for traveling along the mounting track  100 , and an end effector  400 . In order for the system to plot on both the horizontal and vertical axis, the robot  200  further includes a y-track  300 , rigidly mounted to the robot  200 , which extends from the robot  200  perpendicular to the mounting track  100 . In addition, in order to perform the actual plot, the system further includes an end effector  400 , which travels along the y-track  300  of the robot  200 . The end effector  400  includes a pen  413 .  FIG. 1  illustrates at least one embodiment of the present invention. A mounting track  100  is attached to a wall  600  by the mounting brackets  50 . A robot  200  travels along the mounting track  100 . A y-track  300  that extends from the robot  200  is attached to the robot  200  such that this y-track  300  is perpendicular to the mounting track  100 . An end effector  400 , capable of holding a pen, travels along the y-track  300 . In at least one embodiment, a bottom bracket  500  is attached to the bottom of the y-track  300 . 
       Mounting Track  100   
       [0034]    The mounting track  100  is intended to be attached horizontally to a wall by mounting brackets  50  to support and guide the robot  200  in horizontal direction. The mounting track  100  has a first end, a second end and an intermediate extent  105  therebetween. The mounting track  100  further includes a front side and a backside. The first end and second end of a single mounting track  100  can fit together to form longer length mounting track  100  as illustrated in  FIG. 8 . The intermediate extent  105  has at least one or a plurality of fixed toothed rack(s)  106  that can engage with a pinion gear  115  on a robot  200 . In at least one embodiment, the cogs or toothed racks  106  are evenly spaced such that the robot  200  can determine its position relative to the mounting track  100  for drawing an image. The intermediate extent  105  has a plurality of small openings  107 ,  108  that pass from the backside through the front side. A mounting bracket  50  compromises of backing plate  113  and a dowel  110  having a distal end  111  and a proximal end  112 . The dowel  110  can be inserted into the small opening  107 ,  108  on the intermediate extent  105 . In at least one embodiment, the backing plate  113  of the mounting bracket  50  is mounted to the wall using a damage-free adhesive(s)  114 . In other embodiments, the mounting bracket  50  can use damage-free methods of attaching to a wall: magnetic, electro-magnetic, or a vacuum suction systems. A permanent attachment via fasteners or glue is also possible to attach the mounting bracket  50  to a wall. The function of the mounting bracket  50  is to attach the mounting track  100  to a wall or to an uneven wall.  FIG. 10  illustrates a top view of uneven wall and how mounting bracket  50  attaches to the surface, while keeping the mounting track  100  straight, not bent. The mounting track  100  can remain on wall  600  while the robot is not used and not attached. 
         [0035]      FIGS. 2&amp;3  further illustrate the mounting track  100  and the intermediate extent  105 . The intermediate extent  105  has a toothed rack  106 . The intermediate extent  105  has a groove cut out for wheel assembly  206 ,  207  as shown on  FIG. 13 . The intermediate extent  105  has a plurality of small openings  107 ,  108  that pass completely through the intermediate extent  105 . A dowel  110  is attached such that the distal end  111  of the dowel  110  (in relation to the backing plate  113 ) is inserted into the intermediate extent&#39;s  105  small openings  107 ,  108 . The proximal end  112  of the dowel  110  is connected to a backing plate  113 . The backing plate  113  is attached to a wall. In at least one embodiment, a damage-free adhesive  114  is used. The intermediate extent  105  can be any length. In one embodiment, the dowel  110  may tilt vertically in a small angle to adapt the backing plate  113  to uneven wall. 
         [0036]    It is appreciated that the mounting track  100  and its components can be made of many suitable materials known in the art. For example, the dowel  110 , intermediate extent  105 , cogs/teeth, or backing plate  113  may be made of wood, metal, plastic, ceramic, or combinations thereof. 
         [0037]    In at least one embodiment, an additional track on the bottom of the apparatus may provide additional stability, especially in instances where the present invention is used on tall walls. The additional track may include a wheel or some other means for engaging with the apparatus. Without being bound by any particular theory, the additional track may be used to assist in keeping the y-track  300  rigidly mounted to the robot  200  and spaced evenly from the wall for the entire length of the vertically y-track  300 . It is appreciated that the construction of the additional track on the bottom may be similar to that of the mounting track  100  used for the top.  FIG. 12  shows a wheel  508  connected at the end of the y-track  300  for riding along the bottom track allowing for the y-track  300  to stay parallel relative to the wall for the entire length of the y-track. The wheel  508  is controlled by additional x-stepper motor  509  to synchronize the movement of the robot  200  and the bottom of y-track  300 . The additional wheel  508  can be used without the bottom track. 
         [0038]      FIG. 15  illustrates alternative non-damage method for fast installation of the system on the wall  600 . The mounting track  100  is horizontally leveled and supported by (2) two adjustable extension poles  700 . Both ends of the mounting track  100  are connected to the top of the adjustable extension poles  700  by adapters  710 . The bottom ends of the adjustable extension poles  700  have non-slip inserts sitting on the ground or a floor  650 . This method also allows to draw fragments of a large mural/drawing by easily shifting the draw area up and down, left and right without any need to permanently attach the system. 
       Bottom Bracket  500   
       [0039]      FIG. 9  depicts the bottom bracket  500  in more detail. A bottom mount  501  has a bottom mount opening  502  such that it can attach to the end of the y-track  300  rigidly. A pulley tensioner assembly  503  is attached on the bottom mount  501 . A bottom bracket strip  504  is inserted into the mount  501 . In at least one-embodiment feet  505 ,  506  may be used to act as a guide, provide friction and distribute any rotational force to the wall. It is appreciated that the construction of the bottom track may be similar to that of the horizontal track used for the top. 
       Robot  200   
       [0040]      FIG. 4  the robot  200  provides the essential function of the present invention, which is to receive a communicated image, and to plot the image on a wall by traveling along the mounting track  100 , and controlling the position of the end effector  400  having a pen along the y-track  300  that is rigidly mounted to the robot  200 . The robot  200  includes wheel assembly  206 ,  207 , teeth and gears that attach to and engage with the mounting track  100  so that the robot  200  may travel about the mounting track  100 . Without intending to limit the invention, the robot  200  may, upon initiation of a drawing, ride along the mounting track  100  in order to count the number of teeth or cogs so that the robot  200  may determine the extent of which it is able to plot the desired image. The robot  200  may also use encoders attached to x-motor  209  or y-motor  203  or both to determine its location relative to the drawing area. 
         [0041]    The robot  200  further includes a rigidly mounted y-track  300 , which is perpendicular to the mounting track  100 . The y-track  300  is illustrated in  FIG. 1 . The y-track  300  provides the end effector  400  the ability to move in the vertical direction. The y-track  300  also supplies electrical power and signals from the robot  200  to the end effector  400  to control the position of the pen  413 . The y-track  300  includes a first end, a second end and an intermediate extent  305  therebetween. In at least one embodiment, the intermediate extent  305  may be a plurality of intermediate extents  305  which may be connected or removed to lengthen or shorten the y-track  300 .  FIG. 5  illustrates a portion of the y-track  300 . The y-track  300  can be made of many suitable materials known in the art such as wood, metal, plastic, or otherwise. The y-track  300  can be square, rectangular or circular in profile to provide the right rigidity to the system. As illustrated by  FIG. 5 , the first end has a y-track male electrical connector  301  that can attach to the robot  200  and draw power/signal. The second end has a female connector  302 . The y-track  300  may have conductive strips  303  travels along one side or multiple sides of the y-track  300 . In at least one embodiment, the conductive strips  303  is a copper wire. 
         [0042]      FIG. 4  illustrates the internal components of at least one embodiment of the robot  200 . The internal of the robot  200  include a robot base plate  201 , a CPU  202  attached to the robot base plate  201 . A y-motor  203  is attached to the robot base plate  201 ; the y-motor  203  and x-motor  209  are connected to the CPU  202 . A y-track female electrical connector  204  is attached to the robot base plate  201 . A hinge  205  is attached to the top of the robot base plate  201 . The second end of the hinge  205  is attached to a cover plate (see  FIG. 1  for the robot  200  which has the cover in place). Wheel assembly  206 ,  207  are mounted to the top corners of the robot base plate  201 . The release spring  208  is attached to an x-motor  209  and the robot base plate  201 . An x-motor slot  210  limits the x-motor  209  motion to vertically. The release spring  208  allows user to disengage the robot  200  from the mounting track. The release spring  208  allows the pinion gear  115  on x-motor  209  to stay engaged to the toothed rack  106  during operation as shown on  FIG. 14 . 
         [0043]    The robot  200  further includes a communication means to control the position of the end effector  400  traveling along the intermediate extent  305  of the y-track  300  rigidly mounted to the robot  200 . In at least one embodiment, the robot  200  communicates with the end effector  400  using the electro-conductive strips. In at least one embodiment, the communication means is three (but not limited by three) conductive strips  303  made out of conductive material that runs the length of the y-track  300 . The y-track male electrical connector  301  connects to the y-track female electrical connector  204  in order to supply power and signal to the end effector  400  without the need of wires. 
         [0044]    The robot  200  communicates with external computing device, smart phone, handheld computer, personal computer, personal digital assistance (PDA) by cables or wirelessly. The electrical power supplies to the robot  200  by directly connected cable to CPU  202  or through conductive strips  116  attached to the mounting track  100  as shown on  FIG. 13 . 
       End Effector  400   
       [0045]    The end effector  400  interfaces with the y-track  300  that is attached to the robot  200 . The end effector  400  provides the means for plotting the image on the wall through the use of a pen attached to the end effector  400 . In at least one embodiment, an end effector motor  415  is attached to the end effector  400 , wherein the end effector motor  415  controls the pen  413  position, such that the end effector motor  415  may lift or engage the pen  413  where needed. The end effector motor  415  allows for the drawing to be discontinuous. The end effector  400  travels up and down along the y-track  300  attached to the robot  200  providing the relative position on the vertical coordinate plane (Y), while the robot  200  travels along the mounted track  100  to provide the position relative to the horizontal coordinate plane (X). An end effector motor  415  can be replaced by a servo motor, solenoid, DC motor, stepper motor or another actuator that lifts and engages the pen  413 . 
         [0046]    At least one embodiment of the end effector  400  is more particularly illustrated in  FIGS. 6&amp;7  which illustrates a rectangular hollow housing  401  seated over the y-track  300  such that the y-track  300  passes through the rectangular hollow housing  401 . A peripheral extent  402 , has two parallel slots  403 ,  404 . A timing belt (not depicted) seats in each slot  403 ,  404 . One slot has a mean for attaching the end effector  400  to the timing belt, the other slot is merely a guide for the timing belt. The timing belt makes a closed loop over y-motor&#39;s  203  pulley at the top and over a pulley at the pulley tensioner assembly  503  on the bottom mount  501 . A pen cradle  406  is attached to the side of the end effector  400 . A pen cradle  406  creates an opening for a pen  413 . A thumbscrew  407  has a mean to fix a pen by pushing the pen clamp  405 . A thumbscrew  407  end is attracted to the backside of a pen clamp&#39;s magnet  408 , the second end having a thumbscrew. A shaft  409 ,  411  is inserted through tabs on the end effector  400  and the pen cradle  406  so it can slide over the shafts  409 ,  411 . A compression spring  410  is inserted over the shaft  409 . An end effector motor  415  is attached to the backside of the end effector  400 . The end effector motor  415  has an end effector motor arm  416 . The end effector motor arm  416  is capable of pushing against the pen cradle  406  such that the pen cradle  406  will move to an unseated position when the end effector motor  415  is engaged. When the end effector motor arm  416  is not engaged, the compression spring  410  instantaneously adjusts the pen position allowing for drawing on uneven walls without discontinuity of the line of the drawing. The end effector feet  412  engage with conductive strips  303  of the y-track  300  to draw signal and electrical power from the robot  200 .  FIG. 11  shows parts inside of the rectangular hollow housing  401 . In one embodiment, end effector electrical connector  701  has electrical feet connected to a PCB board, which feeds power and signal to the end effector motor  415  by electrical wires from conductive strips  303 . A pressure pad  702  can be used to vary the pressure and friction of the end effector  400  on the y-track  300 . 
       EXAMPLES 
       [0047]    It is to be understood that while the invention has been described in conjunction with the detailed description thereof, the foregoing description is intended to illustrate and not limit the scope of the invention, which is defined by the scope of the appended claims. Other aspects, advantages, and modifications are within the scope of the following claims. 
       Example 1 
       [0048]      FIG. 8  shows a horizontally extended wall mountable system for automated drawing of a mural, technical drawing or template outline upon a wall which includes an extended mounting track  100  for mounting on a wall which has three (3) intermediate extents. The mounting track  100  is mounted to the wall using a damage-free adhesive  114 , which is connected between the wall and the backing plate  113 . Each backing plate  113  has a dowel  110  that connects to the mounting track  100  of each intermediate extent  105 . Each intermediate extent  105  has two (2) openings for connecting a dowel  110  and backing plate  113  for mounting. Each mounting track  100  is leveled while being attached to the wall such that the whole extended mounting track is horizontally leveled. The dowels  110  are self leveling by tilting vertically up and down within a small angle inside the backing plate  113  to adapt the backing plate  113  to uneven wall. 
         [0049]    A robot  200  having a y-track  300  rigidly mounted to said robot  200  is engaged upon the horizontally mounted mounting track  100  with a pinion on the x-motor  209  shown in  FIG. 14 . The y-track  300  extending from the robot  200  is perpendicular to the mounting track  100 . The wheel assembly of robot  200  may travel inside a groove shown in  FIG. 13 . 
         [0050]    An end effector  400 , having a servo as the end effector motor  415  is engaged to the y-track  300 , where the end effector  400  travels along the y-track  300  (in the vertical direction) while communicating with the robot  200  via conductive strips  303  running the length of the y-track. The conductive strips  303  are connected to y-track electrical connector  301  that in turn is mated to the y-track female electrical connector  204  on the robot  200 . The conductive strips  303  allow instructions to be delivered from the robot  200  to the end effector  400  to control the servo motor and the pen movements for drawing the desired image. When said servo is not energized, the compression spring  410  instantaneously pushes the pen to the wall, adjusting to any imperfections and deviations of the said wall.  FIG. 6  shows one example of a pen inside the end effector  400 . 
         [0051]    The robot  200  first receives an image file uploaded from a remote location or a memory storage device connected to the CPU  202 . The robot  200  then initializes by traveling the length of the mounting track  100  to define its vertical axis, and then moves the end effector  400  along the y-track  300  to determine its horizontal axis. The robot  200  positions the end effector  400  by moving about the horizontal axis and moving the end effector  400  about the vertical axis. When the robot  200  is ready to draw, the robot  200  communicates a signal to the servo on the end effector  400 , whereby the servo engages the pen to the wall. The end effector  400  and robot  200  move in relation to each other to move the pen based on the drawing received by the robot  200  and reproduce the drawing on the wall. The robot  200 , end effector  400 , bottom bracket  500  and y-track  300  are removed from the wall as one unit by pushing the x-motor  209  down with one hand and lifting the system off from the mounting track  100  with another. 
       Example 2 
       [0052]    The system provided in Example 1 is used, but further includes a bottom track mounted similar and parallel as the top mounting track  100 . A wheel is connected at the end of the y-track  300  for riding along the bottom track allowing for the y-track  300  to stay parallel relative to the wall for the entire length of the y-track. 
         [0053]    While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the described embodiments in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing the exemplary embodiment or exemplary embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope as set forth in the appended claims and the legal equivalents thereof.