Abstract:
Multi-jointed and pivoted mounting systems for support of a flat panel video display and/or keyboard tray, incorporating a plurality of pivot points providing for pivotal motion of one or more components about a plurality of vertical and horizontal axes. Support arms having elevational pivot assemblies, including plastic friction washers and gas springs, offer elevational arm control requiring constant and predetermined positioning effort on the part of the video display operator and keyboard operator.

Description:
CROSS REFERENCES TO CO-PENDING APPLICATIONS 
     This patent application is a Divisional of 08/869,873 filed Jun. 2, 1997, now U.S. Pat. No. 6,019,332, which is a continuation-in-part )CIP of U.S. Ser. No. 08/660,397 filed Jun. 7, 1996, now U.S. Pat. No. 5,842,672 entitle “Mounting System for Flat Panel Display, Keyboard, and Stand” by the same inventor. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is for mounting systems incorporating a positionable support arm, and more particularly pertains to mounting systems used for supporting a flat panel display in position for viewing or a keyboard in position for operating. 
     2. Description of the Prior Art 
     Prior art mounting systems with positionable support arms have incorporated ball gimbals, simple knob operated pivot mounts, angular slots, and control arms or spring devices which were adjusted to maintain position of a flat panel display supported thereby while offering pivotable capabilities about a small number of pivot centers. Often the lack of a sufficient amount of pivots limited the positionable capabilities of the support arm and the flat panel display about a sufficient number of pivotal axes. Lack of friction control and dynamic lift capability made adjustment of the flat panel display difficult and required the use of two hands to accomplish an adjustment. Additionally, movement of the support arm and flat panel display payload in a downward accomplished easily, as the weight of the flat panel display acted in conjunction with gravitational forces and readily overcame the frictional qualities of the friction pivot style joint. However, movement in an upward direction was not so easily and readily accomplished, as the upward force required to raise the flat panel display had to overcome the friction of the friction style joint as well as the force of gravity. In addition, two-handed adjustments added to the complexity of adjusting the flat panel display. Clearly what is needed is a positional flat panel display mounting system which is positionable over a multitude of axes, which can be repositioned without secondary controls, which incorporates an adjustable counterbalance or lifting system to provide “co-equal” movement force in either the upward or downward direction, which incorporates frictional systems which can be used to establish pre-determined moving forces within OSHA guidelines, and which provides stability for touch screen applications. 
     SUMMARY OF THE INVENTION 
     The general purpose of the present invention is a multi-jointed and pivoted mounting system for support and positioning of a flat panel display or a keyboard. 
     According to one embodiment of the present invention, there is provided a multi-jointed and pivoted mounting system for positioning of a flat panel display including: a pivotal support bracket, a support arm, an arm azimuthal pivot, an arm elevational pivot, an adjustable load counterbalance system, a display roll pivot, a display tilt pivot, a display rotation pivot, and an interface coupling, all acting in concert to support and provide positioning for a flat panel display or any other desired object, such as a keyboard. 
     A frictional pivot mount forms the basis of each pivot and is an unique tilt resistive or tilt restraining device that relies on the unique properties of a family of polymer materials having static and dynamic coefficients of friction which are substantially identical, such as Delrin or other ultra high molecular weight polyethylene (UHMWPE) materials. The result provided by the static and dynamic coefficients of friction of UHMWPE materials, such as utilized in disks or washers of the unique frictional pivot tilt restraining device, is that a flat panel display remains in any tilt position selected by the user. If the user wishes to tiltingly reposition the flat panel display upwardly or downwardly, or any other position, the flat panel display must be manually repositioned to overcome the frictional pivot tilt restraining device. Once the flat panel display is tilted to a different selected position, the unique frictional pivot tilt restraining device resistably restrains the flat panel display in the new position as selected. Sufficient friction to maintain position of the flat panel display during use is provided, and yet easy “breakaway” release to reposition the flat panel display to a new operating position or to the storage position is afforded. The unique characteristics of the polymer material allow smooth tilt adjustment of the frictional pivot tilt mechanism, and yet provide a constant frictional memory for the preset position of the flat panel display. A predetermined poise is required of the operator to reposition the flat panel display, at which time it remains in the new position. 
     One significant aspect and feature of the present invention is a multi-jointed and pivoted mounting system for a flat panel display. 
     Another significant aspect and feature of the present invention is a multi-jointed and pivoted mounting system for a flat panel display which is positionable at any point within the given range of travel of a support arm. 
     Yet another significant aspect and feature of the present invention is a plurality of pivots incorporating ultra high molecular weight polyethylene (UHMWPE) disks or washers (the subject of a pending patent application). 
     Still another significant aspect and feature of the present invention is a plurality of pivots including an arm azimuthal pivot, an arm elevational pivot, a display roll pivot, a display tilt pivot and a display rotation pivot. 
     A further significant aspect and feature of the present invention is an interface connecting the display rotation pivot to the display tilt pivot. 
     A still further significant aspect and feature of the present invention is a load counterbalance mechanism adjuster whose location and angle of adjustment in respect to the arm elevational pivot is derived through the use of a computerized mathematical algorithm for each mounting option offered in the system, to provide a user adjustable counterbalance pivot point for a broad range of display or payload weights. 
     A still further significant aspect and feature of the present invention is a load counterbalance mechanism which provides a dynamically increasing counterbalance moment which corresponds to the increasing moment load on the support arm as the support arm traverses from 0° vertical to 90° horizontal and which provides a dynamically decreasing counterbalance moment which corresponds to the decreasing moment load on the support arm as the support arm moves downward from 90° horizontal to 180° vertical to provide a linear counterbalance force throughout the total adjustable range of the support arm. 
     A still further significant aspect and feature of the present invention is a nitrogen gas spring counterbalance mechanism which operates physically within the pivot point of the support arm, allowing 180° (±90°) rotation of the flat panel display or other load. 
     A still further significant aspect and feature of the present invention is an arm elevation frictional pivot, independent of the arm counterbalance system, which provides for establishment of a predetermined, bi-directional frictional moving force which allows single-handed movement of the flat panel display within OSHA guidelines and yet provides a stable viewing or operating platform for touch screen or keyboard applications. 
     Another significant aspect and feature of the present invention is a pivot/ratchet assembly which attaches a keyboard tray to the outer end of a support arm. The pivot/ratchet assembly offers incremental pivotal positioning in an upward direction about arrays of ratchet teeth and includes a release lever assembly which is utilized to bypass the ratcheting feature to allow manual repositioning for downward positioning of the keyboard tray. The pivot/ratchet assembly can also be incorporated to support a flat panel display. 
     Having thus described significant aspects and features of the present invention, it is the principal object of the present invention to provide a multi-jointed and pivotable mounting system for a flat panel video display or a keyboard. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Other objects of the present invention and many of the attendant advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, in which like reference numerals designate like parts throughout the figures there and wherein: 
     FIG. 1 illustrates a perspective view of a mounting system embodiment according to the present invention in the form of a vertical surface mount for supporting a flat panel display, and also illustrates a flat panel display supported thereby; 
     FIG. 2 illustrates a side view of the elements illustrated in FIG. 1; 
     FIG. 3 illustrates a rotated isometric view of the pivotal support bracket of the vertical surface mount of FIG. 1; 
     FIG. 4 illustrates a front view of the elements illustrated in FIG. 1 with the support arm of the vertical surface mount in the fully lowered position; 
     FIG. 5 illustrates a front view of the pivotal support bracket of FIG. 3 secured to the wall mount track plates of the vertical surface mount of FIG. 1; 
     FIG. 6 illustrates a bottom view in partial cross section of the elements illustrated in FIG. 5; 
     FIG. 7 illustrates a partial cutaway side view of the vertical surface mount of FIG. 1 with the support arm in a downward position along its 180° pivot range about a horizontal axis; 
     FIG. 8 illustrates a partial cutaway side view of the vertical surface mount of FIG. 1 with the support arm in the 90° or horizontal position along its 180° pivot range about a horizontal axis; 
     FIG. 9 illustrates a partial cutaway side view of the vertical surface mount of FIG. 1 with the support arm in an upward position along its 180° pivot range about a horizontal axis; 
     FIG. 10 illustrates a partial cutaway side view of the vertical surface mount of FIG. 1 with the support arm in its uppermost position along its 180° pivot range about a horizontal axis; 
     FIG. 11 illustrates a top view of the elements of FIG.  1  and the pivot arc along which the support arm is capable of moving about a vertical axis; 
     FIG. 12 illustrates a perspective view of a first alternative mounting system embodiment of the present invention in the form of another vertical surface mount for supporting a flat panel display, and also illustrates a flat panel display supported thereby; 
     FIG. 13 illustrates a side view of the elements of FIG. 12; 
     FIG. 14 illustrates a rotated isometric view of the pivotal support bracket of the vertical surface mount of FIG. 12; 
     FIG. 15 illustrates a front view of the elements with the support arm of the vertical surface mount of FIG. 12 in the fully lowered position; 
     FIG. 16 illustrates a front view of the pivotal support bracket of FIG. 14; 
     FIG. 17 illustrates a bottom view in partial cross section of the pivot support bracket of FIG. 14; 
     FIG. 18 illustrates a partial cutaway side view of the vertical surface mount of FIG. 12 with the support arm in one position of various possible positionings along its 180° pivot range about horizontal axis; 
     FIG. 19 illustrates in partial cutaway and partial cross section a side view of a second alternative mounting system embodiment of the present invention in the form of horizontal surface or ceiling track mount for supporting a flat panel display, a also illustrates a flat panel display supported thereby; 
     FIG. 20 illustrates a perspective view of a third alternative mounting system embodiment of the present invention in the form of a tabletop mount incorporating a gas spring for supporting a flat panel display, and also illustrates a flat panel display supported thereby; 
     FIG. 21 illustrates a side view of the elements illustrated in FIG. 20; 
     FIG. 22 illustrates a top view of the elements illustrated in FIG. 20; 
     FIG. 23 illustrates in partial cross section and partial cutaway a side view of the elements illustrated in FIG.  20 . 
     FIG. 24 illustrates in partial cutaway a side view of a fourth alternative mounting system embodiment of the present invention in the form of a tabletop mount incorporating a steel coil spring for supporting a flat panel display, and also illustrates a flat panel display supported thereby; 
     FIG. 25 illustrates a perspective view of a fifth alternative mounting system embodiment of the present invention in the form of a keyboard support system for supporting a keyboard; 
     FIG. 26 illustrates a perspective view of the keyboard tray pivot/brake assembly of the keyboard support system of FIG. 25; 
     FIG. 27 illustrates a top view of the keyboard tray pivot/brake as illustrated in FIG. 26; 
     FIG. 28 illustrates a side view of the keyboard support system of FIG. 25; 
     FIG. 29 illustrates a perspective view of a sixth alternative mounting system embodiment of the present invention in the form of a rolling cart assembly which incorporates a vertical surface mount for supporting a flat panel display, a keyboard support system for supporting a keyboard, and various mounting brackets for supporting other equipment, and also illustrates a flat panel display supported by the vertical surface mount; 
     FIG. 30 illustrates an isometric view of a pivot/ratchet assembly useful as an alternative to certain ones of the pivoting structures of the various mounting systems illustrated in FIGS. 1,  12 ,  19 ,  20 ,  24 ,  25  and  29 ; 
     FIG. 31 illustrates an exploded isometric view of the pivot/ratchet assembly of FIG. 30; 
     FIG. 32 illustrates an isometric view of the pivot/ratchet assembly of FIG. 30 in a partially assembled state; 
     FIG. 33 illustrates a top view of the pivot/ratchet assembly of FIG. 30; 
     FIG. 34 illustrates a cross sectional view of the pivot/ratchet assembly taken along the line  34 — 34  of FIG. 33; and, 
     FIG. 35 illustrates in detail the shape of the individual teeth of an array of smoothed ratchet teeth of the pivot/ratchet assembly. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 illustrates a perspective view of a mounting system embodiment according to the present invention in the form of a vertical surface mount  10  supporting a flat panel display  16 . Angled bracket assemblies  18  and  20  secure suitably to surface mount track plates  12  and  14  to support a pivotal support bracket or arm elevation bracket  22  and its associated components. Pivotal support bracket  22  serves as a pivotal mount for support arm  24  and other associated components including a gas (e.g., nitrogen) spring  25  and left and right support arm members  112  and  114 , respectively. Gas spring  25  secures between the pivotal support bracket  22  and the support arm  24 , as later described in detail. The pivotal support bracket  22  pivots about vertical axis  26  to carry the support arm  24 , a three-axis pivot  30 , and the flat panel display  16  as a unit about the vertical axis  26 . Support arm  24  pivotally secures to the pivotal support bracket  22  to offer movement of the support arm  24 , the three-axis pivot  30 , and the flat panel display  16  as a unit about the horizontal axis  28 . The three-axis pivot  30 , as described later in detail, secures at the outboard end  24   b  of the support arm  24  to support the flat panel display  16 . 
     FIG. 2 illustrates a side view of the elements of FIG.  1 . Illustrated in particular is the three-axis pivot  30  including pivot assemblies  32 ,  34  and  36  suitably secured between the outboard end  24   b  of support arm  24  and a component mount or bracket  38  on the rear surface of the flat panel display  16 . The inboard end  24   a  of the support arm is pivotally secured to the pivotal support bracket  22  to provide elevational pivotal positioning of the support arm  24  and its payload about the horizontal axis  28  illustrated in FIG.  1 . The three-axis pivot  30  and the flat panel display  16  can be elevationally positioned about the horizontal axis  28  in conjunction with and by the action of the support arm  24 . As viewed in FIG. 2, pivot assembly  32  offers rotation of the members outboard of the pivot assembly  32 , that is to say, pivot assemblies  34 ,  36  and flat panel display  16 , about the vertical axis  40  extending through the pivot assembly  32 . Pivot assembly  34  offers tilt of the members outboard of the pivot assembly  34 , that is to say, pivot assembly  36  and flat panel display  16 , about a horizontally aligned axis  42  extending through the pivot assembly  34 , as illustrated in FIG.  4 . Pivot assembly  36  offers tilt of the members outboard of the pivot assembly  36 , that is to say, flat panel display  16 , about a roll axis  44  extending through the pivot assembly  36 . 
     The pivot assembly  32 , of the three-axis pivot  30 , secures to vertically oriented flanges  46  and  48  extending from members of the support arm  24 . 
     Now, with reference to FIGS. 2 and 4 the three-axis pivot  30  is described. Pivot assembly  32  includes angle brackets  50  and  52  secured to support arm flanges  46  and  48  at end  24   b  of the support arm  24 , UHMWPE (ultra high molecular weight polyethylene) disks  54  and  56  aligned to the inner planar surfaces of angle brackets  50  and  52 , respectively, and a bolt  58  having two Belleville washers  59  and  60  and nut  62 . Aligned to the interior surfaces of the UHMWPE disks  54  and  56  are the horizontally aligned portions of angle brackets  64  and  66  which extend outwardly to present the flanged portions for mating to pivot assembly  34 . Bolt  58  extends through the brackets  50 ,  52 ,  64  and  66 , UHMWPE disks  54  and  56 , Belleville washers  59  and  60  and nut  62 . Bolt  58  is tensioned across the assembly to provide suitable friction to stabilize pivot assemblies  34  and  36  and flat panel display  16 . Pivot assembly  34 , constructed in the same manner and fashion as pivot assembly  32 , includes angle brackets  68  and  70  secured to the vertical portions of angle brackets  64  and  66  of the pivot assembly  32 , UHMWPE disks  72  and  74  aligned to the inner surfaces of angle brackets  68  and  70 , respectively, and a bolt  76  having two Belleville washers  77  and  78  and nut  80 . Aligned to the interior surfaces of the UHMWPE disks  72  and  74  are the vertically aligned portions of angle brackets  82  and  84  which extend outwardly to present the flanged portions for mating to pivot assembly  36 . Bolt  76  extends through the brackets  68 ,  70 ,  82  and  84 , UHMWPE disks  72  and  74 , Belleville washers  77  and  78  and nut  80 . Bolt  76  is tensioned across the assembly to provide suitable friction to stabilize pivot assembly  36  and flat panel display  16 , preventing the pivot assembly  36  from falling due to its weight. The frictional tension is adjustable to accommodate various weights of flat panel displays. Pivot assembly  36  includes a plate  86  suitably secured to the flanges of the angle brackets  82  and  84 , a UHMWPE disk  88 , a planar portion  38   a  of bracket  38 , a bolt  90 , a Belleville washer  92  and a nut  94 . Bolt  90  extends through the plate  86 , UHMWPE washer  88 , planar portion  38   a , Belleville washer  92  and nut  94 , and is adjusted to provide tension across the assembly to provide suitable friction. 
     It can be appreciated that an almost infinitesimal number of positionings of the flat panel display  16  are available incorporating the three-axis swiveling of the flat panel display  16  at the three-axis pivot  30  and the horizontal and elevational positionability provided by the pivotal support bracket  22 . In each case it can be appreciated that the flat panel display  16  must be adjustable and yet stay in the position selected by the user. If the user wishes to tiltingly reposition the flat panel display  16  upwardly, downwardly, left to right or in a circular plane, the flat panel display  16  must be manually repositioned to overcome the friction imposed by pivot assemblies  32 ,  34  and  36 . Once the flat panel display  16  is moved to a different selected position, the unique tilt restraining devices inherent in pivot assemblies  32 ,  34  and  36  will resistably restrain the flat panel display  16  in the new position as selected. Sufficient friction to maintain position of the flat panel display  16  during use is provided but easy “breakaway” release to reposition the flat panel display  16  to a new operating position or to a storage position is afforded. The unique characteristics of the polymer material UHMWPE disks  54 ,  56 ,  72 ,  74  and  88  combined with pressure supplied by Belleville washers  59 ,  60 ,  77 ,  78  and  92  allow smooth adjustment of the flat panel display  16  and yet provide a constant frictional memory for the present position of the flat panel display  16 . A predetermined poise is required of the operator to reposition the flat panel display  16 , at which time it remains in the new position. Each pivot point is also adjustable to accommodate various flat panel displays and different length arms. 
     FIG. 3 illustrates a rotated isometric view of the pivotal support bracket  22 , FIG. 5 illustrates a front view of the pivotal support bracket  22  secured to the track plates  12  and  14 , and FIG. 6 illustrates a bottom view in partial cross section of the pivotal support bracket  22  secured to the track plates  12  and  14 . With reference to FIGS. 3,  5  and  6 , the pivotal support bracket  22  is now described. The pivotal support bracket  22  includes a central bracket  96  pivotally suspended between angled support brackets  98  and  100 , which are part of angled bracket assemblies  18  and  20 . Angled support brackets  98  and  100  include planar portions  98   a  and  10   a , respectively, for mounting to the track plates  12  and  14 , illustrated in FIG.  1 . Planar portions  98   a  and  10   a  may be manufactured with extra length, as illustrated by dashed lines in FIG. 3, for mounting to a wall, a plate, a machine or other such surface. Planar portions  98   b  and  10   b , each having a rounded edge, extend at right angles from the planar portions  98   a  and  100   a  and pivotally secure to the central bracket  96 , as later described in detail. 
     The central bracket  96  includes a central planar area  102  having planar members  104  and  106  extending at right angles therefrom. Extending further from the planar members  104  and  106  are contiguous semi-circular members  104   a  and  106   a , respectively, which align to UHMWPE disks  108  and  110  in concert with planar members  104  and  106 . Support arm  24 , illustrated in FIG. 1, includes a left support arm member  112  and a right support arm member  114 . Referring to FIG. 3, left support arm member  112  includes a disk-like portion  112   a  corresponding to the size of the UHMWPE disk  108 . A planar member  112   b  having a flange  112   c  extends from the disk-like portion  112   a  to form part of the support arm  24 . Right support arm member  114  is not shown in FIG. 3 for purposes of brevity and clarity. However, as can be seen from FIGS. 4 and 6, right support arm member  114  is similar to left support arm member  112  and includes a disk-like portion  114   a  corresponding to the size of UHMWPE disk  110  and a planar member  114   b  having a flange  114   c  and extending from the disk-like portion  114   a  to form the other part of the support arm  24 . Planar members  112   b  and  114   b  also act as stops on pivot tabs  162  and  164 , stopping the support arm  24  at a ±90° rotation. FIG. 5 illustrates disk-like portions  112   a  and  114   a  of left and right support arm members  112  and  114  in dashed lines. FIG. 6 illustrates the left and right support arm members  112  and  114  in the down position, but shows the full disk-like portion  112   a  (partially in cross section) and a cutaway view of the disk-like portion  114   a  for purposes of brevity and clarity. A captive stud  116  secures in the disk-like portion  112   a  of the left support arm member  112  and extends through an oilite bearing  118  and accompanying oilite washer  120  assembly centered about and along holes  121  and  123  in the UHMWPE disk  108  and the planar member  104 , respectively, through a steel washer  122 , a Belleville washer  124  and a nut  126 . Nut  126  is adjusted to provide tension across the assembly to provide a predetermined suitable friction to stabilize the left support arm member  112 , pivot assembly, and the flat panel display  16  (not shown). The weight of the flat panel display  16  is counterbalanced by gas spring  25 . In a similar fashion, a captive stud  128  secures in the disk-like portion  114   a  of the right support arm member  114  and extends through an oilite bearing (not shown, but similar to oilite bearing  118 ) and accompanying oilite washer  119  assembly centered about and along holes in the UHMWPE disk  110  and the planar member  106 , through a steel washer  132 , a Belleville washer  134 , and a nut  136 . A nut  136  is adjusted to provide tension across the assembly to provide a predetermined suitable friction to stabilize the right support arm member  114 , pivot assembly, and the flat panel display  16  (not shown). 
     A predetermined frictional force is thus established to ensure that the vertical motion of support arm  24  remains in any position selected by the user. If the user wishes to reposition the flat panel display  16  upwardly or downwardly, the flat panel display  16  must be manually repositioned to overcome the support arm rotational friction established above. Once the flat panel display  16  is moved to a different selected position, the unique friction devices will resistably restrain the flat panel display  16  in its new position as selected. Sufficient friction to maintain position of the flat panel display  16  during use is provided but easy “breakaway” release to reposition the flat panel display  16  to a new operating position or to a storage position is afforded. 
     The unique characteristics of the polymer UHMWPE disks  108  and  110  in combination with a spring force supplied by Belleville washers  124  and  134  allow smooth adjustment of the flat panel display  16  and yet provide a constant frictional memory for the preset position of the flat panel display  16 . A predetermined poise is required of the operator to move the flat panel display  16 , at which time it remains in the new position. This predetermined vertical positioning force is established and functions independently of the support arm  24  payload counterbalance, which is performed by an adjustable gas spring assembly described below. 
     A positionable and adjustable gas spring mount  140  is adjustably mounted to adjustably slide along the central planar area  102  as positioned by a threaded shaft  142  having nuts  144  and  146  affixed at opposing ends. A slot  148  at the lower end of the threaded shaft  142  provides for rotational adjustability of the threaded shaft  142  and thus the gas spring mount  140  along the central planar area  102 . The angle of central planar area  102  and thus the angle of threaded adjustment shaft  142  in relation to the support arm  24  horizontal pivot axis  28 , as shown in FIG. 1, is predetermined by a computerized mathematical algorithm for each mounting option or weight to provide a user adjustable optimum counterbalance force pivot position corresponding to the specific weight of the flat panel display  16  mounted on support arm  24 . See FIGS. 18,  19  and  23  for examples of threaded shafts  342 ,  424  and  642  (each corresponding to threaded shaft  142 ) set at different adjustment angles for each mounting option. It should be noted that positionable and adjustable gas spring mount  140  is positionable in the space between left support arm member  112  and right support arm member  114  up to and intersecting with the support arm  24  horizontal axis  28 , as shown in FIG. 1, allowing the support arm  24  to rotate and counterbalance a variable payload in a range of 0° to 180°. Tabs  150  and  152  extend outwardly from the central planar area  102  to support the ends of the threaded shaft  142  by means of holes located in the tabs  150  and  152  through which the threaded shaft  142  passes. A threaded hole  154  central to the gas spring mount  140  accommodates the threaded shaft  142  for purposes of adjustment of the gas spring mount  140 . Gas spring mount  140  also includes opposed tabs  156  and  158 . A pivot bolt  160  passes through the opposed tabs  156  and  158  to serve as a mount for one end of the gas spring  25 . The outboard end  183  of the gas spring  25  secures to a pivot pin  184  passing through left and right support arm members  112  and  114  and plastic spacers  186  and  188 , as illustrated in FIG.  4 . 
     The load counterbalance mechanism provides a dynamically increasing counterbalance moment which corresponds to the increasing moment load on the support arm  24  as the support arm  24  traverses from 0° vertical to 90° horizontal and provides a dynamically decreasing counterbalance moment which corresponds to the decreasing moment load on the support arm  24  as the support arm  24  moves downward from 90° horizontal to 180° vertical to provide a linear counterbalance force throughout the total adjustable range of the support arm  24 . 
     Pivot tabs  162  and  164  extend at right angles from the planar members  104  and  106 , respectively, to form a portion of angled bracket assemblies  20  and  18 . At angled bracket assembly  20  a bolt  166  passes through a Belleville washer  168 , through planar portion  100   b  of angled support bracket  100 , through a UHMWPE washer  170 , and through pivot tab  162 , and secures into a threaded insert  172  secured to the inner wall of the pivot tab  162 . Bolt  166  is adjusted to provide desirable frictional properties across the assembly. In a similar fashion, and at angled bracket assembly  18 , a bolt  174  passes through a Belleville washer  176 , through planar portion  98   b  of angled support bracket  98 , through a UHMWPE washer  178 , and through pivot tab  164 , and secures into a threaded insert  180  (directly below nut  146  in FIG. 4) secured to the inner wall of the pivot tab  164 . Bolt  174  is adjusted to provide desirable frictional properties across the assembly. This friction stabilizes the entire assembly as it pivots about vertical axis  26  shown in FIG. 1. A semi-circular slot  182  passes through the planar portion  100   b  of angled support bracket  100 , UHMWPE washer  170 , and pivot tab  162  for adjustability access to the slot  148  in the end of the threaded shaft  142 . UHMWPE washer  170  is positioned and secured with respect to the angled support bracket  100  by means of mutually engaged interlock tabs (not illustrated) to prevent washer rotation and secure alignment of the semi-circular slot  182  common to the UHMWPE washer  170 , pivot tab  162 , and planar portion  100   b  of angled support bracket  100 . 
     FIG. 4 illustrates a front view of the support arm  24  in the fully lowered position with attached three-axis pivot  30  and flat panel display  16 . Illustrated in particular is a view of the three-axis pivot  30  and of the gas spring  25  secured between the gas spring mount  140  and the pivot pin  184 , with plastic spacers  186  and  188 , in the support arm  24 . 
     FIG. 5 illustrates a front view of the pivotal support bracket  22  secured to the track plates  12  and  14 . 
     FIG. 6 illustrates a bottom view in partial cross section of the pivotal support bracket  22  secured to the track plates  12  and  14 . 
     MODE OF OPERATION 
     FIGS. 7-10 are side views in partial cutaway of the vertical surface mount  10  showing various positionings of the support arm  24  along its 180° pivot range  191  about horizontal axis  28  shown in FIG.  1 . The three-axis pivot  30  and the flat panel display  16  are not illustrated for purposes of brevity and clarity. In these particular examples the gas spring mount  140  is adjusted to the maximum load position, thus providing the greatest offset from horizontal pivot axis  28 , providing the greatest gas spring assistance. As adjustable gas spring mount  140  is adjusted closer to the horizontal axis  28 , the counterbalance pivot point is lessened, which is desirable with smaller, lighter loads. Infinite adjustability within a range of payloads is desirable and attainable with this design. Also illustrated is the ability of the support arm  24  to travel from ±90° (vertical up position) to −90° (vertical down position). 
     It should be noted that for each and every various monitor weight there is an optimum position for the gas spring mount  140 . And, even further, it should be noted that at each adjustment point (weight of monitor), the support arm  24  will, by design, dynamically adjust the counterbalance moment as the support arm  24  is moved through the 180° range of travel. 
     The load moment increases as the support arm  24  travels from 0° to 90°, reaching its maximum at 90°. It then decreases as the support arm  24  is moved from 90° to 180. The load moment is at its minimum (zero) when the support arm  24  is vertical, 0° or 180°. 
     The counterbalance moment increases and decreases essentially to cancel the load moment as the support arm  24  travels from 0° to 90° to 180°. The dynamic aspect of the counterbalance is created by the relationship of the three pivot points in the system. Point B is the pivot of the support arm  24  through the horizontal axis  28 . Point A is the gas spring pivot bolt  160  on the pivotal support bracket  22 . Point C is the gas spring pivot at pivot pin  184  away from the support arm  24  pivot at B. At 0° and 180° the three pivot points B, A and C are all in line, thus providing zero counterbalance moment. As the support arm  24  pivots about the pivot at B, the angle A-C-B increases to its maximum at 90° and then decreases back to zero at 180°. This dynamic angle exactly corresponds with the load moment. The angle created about these pivot points puts the gas spring  25  in the correct position to counterbalance the load moment for each position of the support arm  24 . 
     FIG. 11 illustrates a top view of the elements of FIG.  1  and the pivot arc  190  of the support arm  24  about vertical axis  26 , as shown in FIG. 1, where bolt  174  secures angled bracket assembly  18  to the pivotal support bracket  22 . The pivot arc  190  is capable of ±90° range, or greater, depending on the mounting configuration. The limit would normally be set by the width of the flat panel display  16  when it contacts the wall, plate, machine or other such surface, prior to the 90° pivot. Pivot assembly  32  allows the flat panel display  16  to be pivoted about vertical axis  40 , shown in FIG. 2, allowing the flat panel display  16  to be positioned parallel to the wall, plate, machine or other such surface. 
     FIG. 12 illustrates a perspective view of another vertical surface mount  210 , the first alternative mounting system embodiment, supporting a flat panel display  216 . Pivotal support bracket or arm elevation bracket  222  serves as a pivotal mount for support arm  224  and other associated components including a gas (e.g., nitrogen) spring  225 . Gas spring  225  secures between the pivotal support bracket  222  and the support arm  224 , as later described in detail. Support arm  224  pivotally secures to the pivotal support bracket  222  to offer movement of the support arm  224 , the single-axis pivot  230 , as shown in FIG. 13, and the flat panel display  216  as a unit about the horizontal axis  228 . Alternately, the three-axis pivot  30 , such as previously described in detail, can be secured at the outboard end  224   b  of the support arm  224  to support the flat panel display  216 . 
     FIG. 13 illustrates a side view of the elements of FIG.  12 . Illustrated in particular is the single-axis pivot  230  suitably secured between the outboard end  224   b  of support arm  224  and a component mount or bracket  238  on the rear surface of the flat panel display  216 . The inboard end  224   a  of the support arm  224  is pivotally secured to the pivotal support bracket  222  to provide elevational pivotal positioning of the support arm  224  and its flat panel display  216  payload about the horizontal axis  228  illustrated in FIG.  12 . The single-axis pivot  230  and the flat panel display  216  can be elevationally positioned about the horizontal axis  228  in conjunction with and by the action of the pivoted support arm  224 . As viewed in FIG. 13, the single-axis pivot  230  offers tilt of the flat panel display  216  about the horizontal axis  240 , as shown in FIG. 15, extending through the single-axis pivot  230 . 
     The single-axis pivot  230  secures to vertically oriented flanges  246  and  248  extending from members of the support arm  224 . 
     Now, with reference to FIGS. 13 and 15 the single-axis pivot  230  is further described. The single-axis pivot  230  includes angle brackets  250  and  252  secured to support arm flanges  246  and  248  at outboard end  224   b  of the support arm  224 , UHMWPE disks  254  and  256  aligned to the inner planar surfaces of angle brackets  250  and  252 , respectively, and a bolt  258  having two Belleville washers  259  and  260  and nut  262 . Aligned to the interior surfaces of the UHMWPE disks  254  and  256  are the vertically aligned juxtaposed portions of angle brackets  264  and  266  which extend outwardly to present flanged portions for mating to bracket  238 , which mounts the flat panel display  216  to the single-axis pivot  230 . Bolt  258  extends through the angle brackets  250 ,  252 ,  264  and  266 , UHMWPE disks  254  and  256 , Belleville washers  259  and  260 , and nut  262 . Bolt  258  is tensioned across the assembly to provide suitable friction to support the flat panel display weight at all positions as the flat panel display  216  is tilted about horizontal axis  240 , of FIG. 15, and moved vertically about horizontal axis  228 , of FIG. 12, with support arm  224 . 
     FIG. 14 illustrates a rotated isometric view of the pivotal support bracket  222 , FIG. 16 illustrates a front view of the pivotal support bracket  222 , and FIG. 17 illustrates a bottom view in partial cross section of the pivotal support bracket  222 . With reference to FIGS. 14,  16  and  17 , the pivotal support bracket  222  is now described. The pivotal support bracket  222  includes a central bracket  296  having a central planar area  302  and planar members  304  and  306  extending at right angles therefrom. Extending further from the planar members  304  and  306  are contiguous semi-circular members  304   a  and  306   a , respectively, which align to UHMWPE disks  308  and  310  in concert with planar members  304  and  306 . Support arm  224 , illustrated in FIG. 12, includes a left support arm member  312  and a right support arm member  314 . Referring to FIG. 14, left support arm member  312  includes a disk-like portion  312   a  corresponding to the size of the UHMWPE disk  308 . A planar member  312   b  having a flange  312   c  extends from the disk-like portion  312   a  to form part of the support arm  224 . Right support arm member  314  is not shown in FIG. 14 for purposes of brevity and clarity. However, as can be seen from FIGS. 15 and 17, right support arm member  314  is similar to left support arm member  312  and includes a disk-like portion  314   a  corresponding to the size of the UHMWPE disk  310  and a planar member  314   b  having a flange  314   c  and extending from the disk-like portion  314   a  to form the other part of the support arm  224 . Flanges  312   c  and  314   c  of FIG. 15 also act as stops on bracket tabs  304   b  and  306   b , stopping the support arm  224  at a ±90° rotation. FIG. 16 illustrates disk-like portions  312   a  and  314   a  of left and right support arm members  312  and  314  in dashed lines. FIG. 17 illustrates the left and right support arm members  312  and  314  the down position, but shows the full disk-like portion  312   a  (partially in cross section) and a cutaway view of the disk-like portion  314   a  for purposes of brevity and clarity. A captive stud  316  secures in the disk-like portion  312   a  of the left support arm ember  312  and extends through an oilite bearing  318  and accompany oilite washer  320  assembly centered about and along holes  321  and  323  in the UHMWPE disk  308  and the planar member  304 , respectively, through a steel washer  322 , a Belleville washer  324 , and a nut  326 . Nut  326  is adjusted to provide tension across the assembly to provide suitable friction to stabilize the left support arm member  312 . In a similar fashion, a captive stud  328  secures in the disk-like portion  314   a  of the right support arm member  314  and extends through an oilite bearing (not shown, but similar to oilite bearing  318 ) and accompanying oilite washer  319  assembly centered about and along holes in the UHMWPE disk  310  and the planar member  306 , through a steel washer  332 , a Belleville washer  334 , and a nut  336 . Nut  336  is adjusted to provide tension across the assembly to provide suitable friction to stabilize the right support arm member  314 . 
     A positionable and adjustable gas spring mount  340  is adjustably mounted to adjustably slide along the central planar area  302  as positioned by a threaded shaft  342  having nuts  344  and  346  affixed at opposing ends. A slot  348  at the lower end of the threaded shaft  342  provides for rotational adjustability of the threaded shaft  342  and thus the gas spring mount  340  along the central planar area  302 . The angle of central planar area  302  and thus the angle of threaded adjustment shaft  342  in relation to the support arm  224  horizontal pivot axis  228 , as shown in FIG. 12, is predetermined by a computerized mathematical algorithm for each mounting option or weight to provide a user adjustable counterbalance force pivot position throughout the support arm  224  operating range. See FIGS. 18,  19  and  23  for examples of threaded shafts  342 ,  424  and  642  set at different adjustment angles for each mounting option. It should be noted that positionable and adjustable gas spring mount  340  is positionable in the space between left support arm member  312  and right support arm member  314  up to and intersecting with the support arm  224  horizontal axis  228 , as shown in FIG. 12, allowing the support arm  224  to rotate and counterbalance a variable payload in a range of 0° to 180. Tabs  350  and  352  extend outwardly from the central planar area  302  to support the ends of the threaded shaft  342  by means of holes located in the tabs  350  and  352  through which the threaded shaft  342  passes. A threaded hole  354  central to the gas spring mount  340  accommodates the threaded shaft  342  for purposes of adjustment of the gas spring mount  340 . Gas spring mount  340  also includes opposed tabs  356  and  358 . A pivot bolt  360  passes through the opposed tabs  356  and  358  to serve as a mount for one end of the gas spring  225 . The outboard end  383  of the gas spring  225  secures to a pivot pin  384  passing through left and right support arm members  312  and  314  and plastic spacers  386  and  388 , as illustrated in FIG.  15 . 
     The load counterbalance mechanism provides a dynamically increasing counterbalance moment which corresponds to the increasing moment load on the support arm  224  as the support arm  224  traverses from 0° vertical to 90° horizontal and provides a dynamically decreasing counterbalance moment which corresponds to the decreasing moment load on the support arm  224  as the support arm  224  moves downward from 90° horizontal to 180° vertical to provide a linear counterbalance force throughout the total adjustment range of the support arm  224 . 
     FIG. 15 illustrates a front view of the elements of FIG. 12 with the support arm  224  in the fully lowered position with attached single-axis pivot  230  and flat panel display  216 . Illustrated in particular is a view of the single-axis pivot  230  and of the gas spring  225  secured between the gas spring mount  340  and the pivot pin  384 , with plastic spacers  386  and  388 , in the support arm  224 . 
     FIG. 16 illustrates a front view of the pivotal support bracket  222 . 
     FIG. 17 illustrates a bottom view in partial cross section of the pivotal support bracket  222 . 
     FIG. 18 illustrates a partial cutaway side view of the vertical surface mount  210  with the support arm  224  in one position of various possible positionings along its 180° pivot range about horizontal axis  228  shown in FIG.  12 . Arc  390  further illustrates the 180° range of motion of the pivot positionings. The single-axis pivot  230  and the flat panel display  216  are not illustrated for purposes of brevity and clarity. 
     FIG. 19 illustrates, in partial cutaway and partial cross section, a side view of a horizontal surface or ceiling track mount  400 , the second alternate mounting system embodiment, supporting a flat panel display. The horizontal surface or ceiling track mount  400  is comprised of a support bracket  402  and four track wheels  404 ,  405 ,  406  and  407 , a support arm  432 , a single-axis pivot  430 , and a pivotal support bracket or arm elevation bracket  408  constructed according to the same principles as pivotal support bracket  222  illustrated in FIG.  14 . The support arm  432  and the single-axis pivot  430  are constructed identically to the support arm  224  and single-axis pivot  230 , respectively, illustrated in FIG.  15 . The pivotal support bracket  408  rotates around vertical axis  410  providing an infinitesimal number of azimuthal positionings. The horizontal surface or ceiling track mount  400  is designed according to the same principles taught in the vertical surface mount embodiments, having a pivotal support bracket  408 , bolt  412 , Belleville washers  413  and  418 , steel washer  414 , UHMWPE disk  416 , nuts  420 ,  426  and  428 , an adjustable gas spring mount  422 , and threaded shaft  424 . Threaded shaft  424  is at a 3° offset to the vertical axis  410 . 
     Track wheels  404 ,  405 ,  406  and  407  are captured by a ceiling mounted track  401  which allows the horizontal surface or ceiling track mount  400  and supported flat panel display to be easily rolled to any location along the ceiling mounted track. In the alternative, eliminating the ceiling mounted track  401  provides the option of incorporation of a fixed, rotational overhead mount. 
     FIGS. 20-21 illustrate two views of a tabletop (or desktop) mount  510 , the third alternative mounting system embodiment of the present invention, supporting a flat panel display  516 . The tabletop mount  510  is comprised of an angled base  512  with a recess  514 , a pivotal support bracket or arm elevation bracket assembly  522 , and a support arm  524  having a gas (e.g., nitrogen) spring  525 . The pivotal support bracket assembly  522  is designed and constructed according to the same principles taught in the previous embodiments and rotates about vertical axis  523  providing azimuthal rotation of the support arm  524  and the flat panel display  516 . A single-axis pivot  530  connects the support arm  524  to the flat panel display  516 . The single-axis pivot  530  is designed and constructed according to the concept of the single-axis pivot  230  described in relation to FIG.  15 . 
     FIG. 22 illustrates a top view of the tabletop mount  510 . Specifically, the pivotal support bracket assembly  522 , the support arm  524 , and the single-axis pivot  530  will now be described in detail. 
     The pivotal support bracket assembly  522 , designed and constructed using the same principles taught in the previous embodiments, is comprised of nuts  626  and  636 , Belleville washers  624  and  634 , steel washers  622  and  632 , oilite washers  619  and  620 , bracket planar members  604  and  606 , UHMWPE disks  608  and  610 , left and right support arm members  612  and  614 , respectively, with disk-like portions  612   a  and  614   a , respectively, captive studs  616  and  628 , an adjustable gas spring mount  640  movable along a threaded shaft  642 , and a pivot bolt  660 . 
     The support arm  524  is comprised of a left support arm member  612 , designed and constructed using the same principles taught in the previous embodiments, a right support arm member  614 , a gas spring  525 , plastic spacers  686  and  688 , a pivot pin  684 , and flanges  546  and  548 . 
     The single-axis pivot  530 , designed and constructed using the same principles taught in the first alternative embodiment, is comprised of angle brackets  550 ,  552 ,  564  and  566 , UHMWPE disks  554  and  556 , Belleville washers  559  and  560 , component mount or bracket  538 , and bolt  558  and nut  562 . 
     FIG. 23 illustrates in partial cross section and in partial cutaway a side view of the third alternative mounting system embodiment. The pivotal support bracket assembly  522 , which rotates about its vertical axis  523 , is now described in detail, specifically the mounting of the pivotal support bracket assembly  522  to the angled base  512 . The pivotal support bracket assembly  522  is secured to angled base  512  in the recess  514  where bolt  694  passes downwardly through Belleville washer  696 , pivotal support bracket assembly  522 , UHMWPE disk  700 , planar member  512   a  of angled base  512 , steel washer  698 , and Belleville washer  702 , and is frictionally secured via nut  704 . Removal of the angled base  512  allows the pivotal support bracket assembly  522  to be mounted in a pivotal application to a table, desk or countertop, or other mounting surface. Threaded shaft  642 , secured by nuts  690  and  692 , is offset  100  to the vertical axis  523 . 
     FIG. 24, a fourth alternative mounting system embodiment, illustrates in partial cutaway a side view of a tabletop (or desktop) mount  800  similar in construction and concept to the tabletop mount illustrated in FIGS. 20-23 and incorporating a support arm  802  having a steel coil spring  810 . The tabletop mount  800 , with a steel coil spring  810 , is designed and constructed using the same principles taught in the previous embodiments, with the substitution of a steel coil spring  810  for the gas spring  525 , and provides a pulling counterbalance force in lieu of the lifting force provided by gas spring  525 , shown in FIG.  23 . Since the steel coil spring is providing a pulling force, the positionable and adjustable gas spring mount  640  is mounted above the support arm horizontal pivot axis, such as axis  28  as shown in FIG. 1, instead of below. The support arm  802  with a steel coil spring  810  is mounted to angled base  512  in the same fashion using the same hardware as shown and described in FIG.  23 . 
     FIG. 25 illustrates a perspective view of a keyboard support system  1000 , the fifth alternative mounting system embodiment. The keyboard support system  1000  consists of a keyboard tray  1010 , a mouse pad tray  1012 , a pivot/brake assembly  1072  and a support arm  1014 . The keyboard tray  1010  includes a fixed portion  1016  with mounting lip  1018  which extends perpendicular to the fixed portion  1016 . Cable access holes  1022 ,  1024  and  1026  are located at the junction of the fixed portion  1016  and the mounting lip  1018 . The mounting lip  1018  also has a plurality of mounting holes  1020   a - 1020   n  for securing the keyboard tray  1010  to the pivot/brake assembly  1072  and connected support arm  1014 . Support arm  1014  is designed and constructed similarly to support arm  224  of FIG.  15 . The pivot/brake assembly  1072  attaches to support arm  1014  with a plurality of screw and nut combinations  1021   a - 1021   n . The keyboard tray  1010  also includes a slide plate  1028  having a right extended member  1030 , a left extended member  1032 , slots  1034  and  1036 , machine screws  1040  and  1042 , and a front lip  1038 . The right and left extended members  1030  and  1032  accommodate various lengths of keyboard wrist rests. The slide plate  1028  slidingly secures to the fixed portion  1016  via slots  1034  and  1036  where machine screws  1040  and  1042  frictionally secure mutually thereto. Mounting lip  1018  and front lip  1038 , when properly adjusted, capture and secure the keyboard and keyboard wrist rest to the keyboard tray  1010 . 
     The mouse pad tray  1012  consists of a contiguous slide plate  1054  having an upper planar member  1056  and a lower planar member  1058 , which are vertically offset and joined by an intermediate portion  1060 . Mouse pad tray  1012 , having a planar surface  1044  and lips  1046 ,  1048 ,  1050  and  1052 , secures to the lower planar member  1058  of the contiguous slide plate  1054  via hook and loop material, double-sided tape or like materials. The upper planar member  1056  slidingly engages slide channels  1068  and  1070 , shown in FIG. 28, where a machine screw  1064 , having a knob  1064   a , extends through a threaded hole in contiguous slide plate  1054  and upward into slot  1062 . Machine screw  1066 , having a knob  1066   a , extends through a threaded hole in the contiguous slide plate  1054  to lock or stop all movement of the mouse pad tray  1012 . Machine screw  1064  is a stop to limit lateral travel of the mouse pad tray  1012 . The machine screw  1064  can be loosened by the knob  1064   a  to back the machine screw  1064  out of slot  1062  to allow the mouse pad tray  1012  to be removed and reinserted on the other side of the keyboard tray fixed portion  1016 . 
     FIG. 26 illustrates a perspective view of the pivot/brake assembly  1072 . Support arm  1014  is not shown for purposes of brevity and clarity. The pivot/brake assembly  1072  includes a U-shaped bracket  1074  with a left member  1074   a  and a right member  1074   b  which support friction assembly  1100  and brake assembly  1102 , respectively. 
     The friction assembly  1100  is now described. Bolt  1084  extends through angled bracket  1076 , UHMWPE disk  1088 , the left member  1074   a  of U-shaped bracket  1074 , UHMWPE disk  1090 , angled bracket  1078 , and Belleville washer  1104 , all of which are collectively frictionally secured via nut  1096 , as shown in FIG. 27. A predetermined frictional force is thus established to ensure that the tilting motion of keyboard tray  1010 , shown in FIG. 25, remains in any position selected by the user. If the user wishes to reposition the tilt of the keyboard tray  1010 , the keyboard tray  1010  must be manually repositioned to overcome the keyboard tray  1010  tilting friction established above. Once the keyboard tray  1010  is moved to a different selected position, the unique friction devices will resistably restrain the keyboard tray  1010  in its new position as selected. Sufficient friction to maintain position of the keyboard tray  1010  during preparation for use is provided, but easy “breakaway” release to reposition the keyboard tray  1010  to a new operating position or to a storage position is afforded. The keyboard tray  1010  is locked into any position to provide increased stability using brake assembly  1102 , which will be described in detail later, before the keyboard tray  1010  is used for mouse or keyboard input. 
     The unique characteristics of the UHMWPE disks  1088  and  1090  in combination with a spring force supplied by Belleville washer  1104  allow smooth adjustment of the keyboard tray and yet provide a constant frictional memory for the preset position of the keyboard tray. A predetermined poise is required of the operator to move the keyboard tray, at which time it remains in the new position. 
     The brake assembly  1102  is now described. Brake assembly  1102  has a brake handle  1108  having a threaded shaft  1086  which extends from the lower portion of the brake handle  1108  at a 90° angle, and extends through washer  1106 , shown in FIG. 27, angled bracket  1082 , steel washer  1094 , the right member  1074   b  of U-shaped bracket  1074 , steel washer  1092 , and angled bracket  1080 , all of which are collectively frictionally secured via nut  1098 , which is welded to angled bracket  1080 . Rotating brake handle  1108  will cause threaded shaft  1086  to turn in either direction, either lessening the frictional tension, allowing for a new tilt position to be selected, or increasing the frictional tension, which will act as a brake mechanism, locking the keyboard tray  1010  into position. 
     FIG. 27 illustrates a top view of the pivot/brake assembly  1072 . 
     FIG. 28 illustrates a side view of the keyboard support system  1000 . Illustrated in particular are the slide channels  1068  and  1070  where the contiguous slide plate  1054  of the mouse pad tray  1012  slidingly engages the keyboard tray  1010 . The upper planar member  1056  of the mouse pad tray  1012  is captured by the slide channels  1068  and  1070 . 
     Also illustrated in FIG. 28 is a plurality of mounting bolts  1112   a - 1112   n  and nuts  1110   a - 1110   n  which secure the mounting lip  1018  of the keyboard tray  1010  to the pivot/brake assembly  1072 . 
     FIG. 29 illustrates a perspective view of a sixth alternative mounting system embodiment in the form of a rolling cart assembly  1200 . The rolling cart assembly  1200  includes a base  1210  with a plurality of dual wheel casters  1212   a - 1212   n  which supports a mounting pole  1214 . Secured to the mounting pole  1214 , via a plurality of pole mounting brackets  1216 a- 1216 n, are the pivotal support bracket  222  and the support arm  224  of a vertical surface mount  210  which supports flat panel display  216 , and the support arm  1014  in connection with pivot/brake assembly  1072  of a keyboard support system  1000 . Also supported by the mounting pole  1214  is a CPU mounting bracket  1218 . A mail tray bracket  1220  is secured to the base  1210  of the mounting pole  1214 . The combination of these elements creates a mobile, easily adjustable, computer work station. The adjustability features of the rolling cart assembly  1200  allow the mobile work station to be easily adjusted for standing and sitting work applications, providing the ability to maintain a  16 -inch or other desired separation between the monitor and keyboard in any position. The support arm  224  and support arm  1014  may be positioned vertically for easy storage, ease of mobility and other considerations. 
     FIG. 30 illustrates an isometric view of a pivot/ratchet assembly  1300  which can be incorporated and utilized as an alternative for (a) the pivot assembly  34  for support of the flat panel display  16  of FIG. 2; (b) the single-axis pivot  230  for support of the flat panel display  216  of FIG. 13; (c) the single-axis pivot  430  for support of a flat panel display of FIG. 19; (d) the single-axis pivot  530  for support of the flat panel display  516  of FIG. 21; (e) pivot/brake assembly  1072  for support of the keyboard tray  1010  of FIG. 25; and (f) the support of any keyboard or keyboard tray, keyboard/mouse/trackball tray, flat panel or other display or any other device requiring pivotal support. 
     With reference to FIGS. 30,  31  and  32  the structure of the pivot/ratchet assembly  1300  is now described where FIG. 31 illustrates an isometric exploded view and FIG. 32 illustrates an isometric view of a partially assembled pivot/ratchet assembly  1300 . A U-shaped bracket  1302  is central to the pivot/ratchet assembly  1300  and includes a planar portion  1302   a  having a plurality of mounting holes  1304   a - 1304   n . A left planar member  1302   b  and a right planar member  1302   c  extend at right angles from the planar portion  1302   a . Threaded pivot studs  1306  and  1308  extend through and frictionally engage the left planar member  1302   b  and the right planar member  1302   c , respectively. A semi-circular array of smoothed ratchet teeth  1310 , whose radius center is co-located with the center of the pivot stud  1306 , is located at one end of the left planar member  1302   b . Another semi-circular array of smoothed ratchet teeth  1312 , whose radius center is co-located with the center of the pivot stud  1308 , is located at one end of the right planar member  1302   c . In order, and with reference to FIG. 31, a UHMWPE washer  1314 , an angle bracket  1316  having a large pivot hole  1318 , a Belleville washer  1320 , a thrust washer  1322 , and a Nylock nut  1324  align and secure over and about the threaded pivot stud  1306 . In the same fashion, a UHMWPE washer  1326 , an angle bracket  1328  having a large pivot hole  1330 , a Belleville washer  1332 , a thrust washer  1334 , and a Nylock nut  1336  align and secure over and about the threaded pivot stud  1308 . Angle bracket  1316  includes a large planar member  1316   a , one end of which is rounded, having an upper pivot hole  1338  and a lower hole  1340  in addition to the large pivot hole  1318  and also includes a small planar member  1316   b  extending perpendicular to the large planar member  1316   a . Angle bracket  1328  includes a large planar member  1328   a , one end of which is rounded, having an upper pivot hole  1342  and a lower hole  1344  in addition to the large pivot hole  1330  and also includes a small planar member  1328   b  extending perpendicular to the large planar member  1328   a . Mounting holes  1319 a and  1319 b and mounting holes  1329   a  and  1329   b  are included in angle bracket small planar members  1316   b  and  1328   b , respectively, for mounting to a keyboard tray such as keyboard tray  1010 , previously illustrated, or, in the alternative, to a flat panel display. 
     A release lever assembly  1346  pivotally secures and aligns between the left angle bracket  1316  and the right angle bracket  1328  and interfaces with the semi-circular arrays of smoothed ratchet teeth  1310  and  1312 . The release lever assembly  1346  includes a configured body member  1348  formed from a planar member and having a plurality of tabs extending at right angles from a lower central planar portion  1357  for the mounting of a pivot pin  1350  and roll pins  1352  and  1354 . The substantially vertically aligned configured body member  1348  includes, coplanar with the central planar portion  1357 , a release tab  1356  for manual release from the ratcheting feature which is described later in detail. A vertically aligned outer left tab  1358  and an opposing vertically aligned outer right tab  1360  extend at right angles from the central planar portion  1357 . Pivot holes  1362  and  1364  are located in the upper regions of the outer left tab  1358  and the outer right tab  1360 , respectively. Holes  1366  and  1368  are located in the lower region of the outer left tab  1358  and the outer right tab  1360 , respectively. Pivot pin  1350  aligns through pivot holes  1362  and  1364  located in the upper regions of the outer left tab  1358  and the outer right tab  1360 , respectively, as well as through respective holes  1338  and  1342  in the upper regions of angle brackets  1316  and  1328 . Press-on nuts  1370  and  1372  frictionally engage the ends of the pivot pin  1350  to positionally fix the pivot pin  1350  in position. opposing vertically aligned left and right inner tabs  1374  and  1376  extend at right angles from the lower central planar portion  1357  and include holes  1378  and  1380 , respectively. Roll pin  1352  aligns in and frictionally engages holes  1366  and  1378  in the outer left tab  1358  and the inner left tab  1374 , respectively. Roll pin  1354  aligns in and frictionally engages holes  1368  and  1380  in the outer right tab  1360  and the inner right tab  1376 , respectively. Roll pins  1352  and  1354  engage the arrays of smooth ratchet teeth  1310  and  1312 , respectively, the operation of which is described later in detail. Blocks of rubber, foam, plastic or other suitable resilient material  1382  and  1384 , secure in a suitable fashion to the rearward lower planar surface of the central planar portion  1357  of the release lever assembly  1346  to provide positive spring-like pressure for forced engagement of the roll pins  1352  and  1354  with the semi-circular arrays of smoothed ratchet teeth  1310  and  1312 , as later described in detail. Any suitable spring-like arrangement can be utilized for this function and shall not be construed to be limiting to the scope of the invention. 
     FIG. 33 illustrates a top view of the pivot/ratchet assembly  1300 . Illustrated in particular is the alignment of the roll pins  1352  and  1354  in the release lever assembly  1346  with the smoothed ratchet teeth arrays  1310  and  1312  on the U-shaped bracket  1302 . 
     FIG. 34 illustrates a cross sectional view of the pivot/ratchet assembly  1300  along line  34 — 34  of FIG.  33 . The relationship between the release lever assembly  1346  and the smoothed ratchet teeth array  1312  is described herein. The relationship between the release lever assembly  1346  and the smoothed ratchet teeth array  1310  is similar and is not described for purpose of brevity and clarity. The release lever assembly  1346  and an attached keyboard tray  1010  are supported by and pivot about pivot stud  1308  (and  1306 ) and are positionally held by interaction of the smoothed ratchet teeth array  1312  (and  1310 ) and roll pin  1354  (and  1352 ). The release lever assembly  1346  pivots either clockwise or counterclockwise about pivot pin  1350  to position the roll pin  1354  with respect to the smoothed ratchet teeth array  1312 . Roll pin  1354 , being part of the release lever assembly  1346 , is forced and held in engagement between an angled and non-angled portion of ratchet teeth of the smoothed ratchet teeth array  1312 , as shown in FIG. 35, by the spring-like action of the resilient rubber block  1382  and holds in position and prevents rotation of the release lever assembly  1346  and the attached keyboard tray  1010  and the angle bracket  1328  in a clockwise direction about the pivot stud  1308 . Cantilever forces force the roll pin  1354  against the non-angled portion of a ratchet tooth of the smoothed ratchet teeth array  1312  for support of the release lever assembly  1346 , the attached keyboard tray  1010 , and angle bracket  1328 . 
     Counterclockwise rotation of the release lever assembly  1346 , the attached keyboard tray  1010 , and the angle bracket  1328  about the pivot stud  1308  for upward angular displacemental adjustment of the keyboard tray  1010  is allowed and effected by manually grasping the outer end of the keyboard tray  1010  and lifting, thereby causing the roll pin  1354  to be forced, against the spring-like pressure exerted by the resilient rubber block  1382 , along the angled portion of a ratchet tooth of the smoothed ratchet teeth array  1312 , along and about the smoothed tooth end, and into a position between successive angled and non-angled teeth surfaces to a desired position. 
     Clockwise rotation about pivot stud  1308  to angularly displace the keyboard tray  1010  downwardly is effected by depressing the release tab  1356  to the left, against the spring-like pressure exerted by the resilient rubber block  1382 , to pivot the release lever assembly  1346  about the pivot pin  1350  to remove the roll pin  1354  from influence of the smoothed ratchet teeth array  1312  to allow rotational freedom of the release lever assembly  1346 , the attached keyboard tray  1010 , and the angle bracket  1328  in a clockwise direction about the pivot stud  1308 . Releasing of the release tab  1356  then causes the roll pin  1354  to again engage a position between adjacent angled and non-angled teeth surfaces to secure the release lever assembly  1346 , the attached keyboard tray  1010 , and angle bracket  1328  against further clockwise rotation. 
     Elevational rotation of the support arm  1014  about a pivot support bracket, such as pivotal support bracket  222 , in combination with the pivotal positioning of the keyboard tray  1010  about the pivot/ratchet assembly  1300 , as just previously described, offers a great degree of elevational and angular adjustment. 
     FIG. 35 illustrates in detail the shape of the teeth in the smoothed ratchet teeth array  1312 . With reference to a horizontally aligned radius line  1386  the shape of the teeth is now described. Tooth  1388  includes a flat surface  1392  which is parallel to radius line  1386  upon which vertical forces from the keyboard tray  1010  are brought to bear through roll pin  1354  during static operation. Also, lateral forces caused by the resilient rubber block  1382  force the roll pin  1354  into the arced portion  1394  between teeth  1388  and  1390  during static operation. During upward keyboard adjustment, as previously described, the spring force of the resilient rubber block  1382  is overcome as roll pin  1354  is forced along and about the flat tooth surface  1396 , which is angled or ramped with respect to the radius line  1386 . The roll pin  1354  then traverses the arc surface  1398  at the end of tooth  1390  to be forced by the resilient rubber block  1382  between teeth  1390  and  1400 . Smooth and quieted transition of a roll pin, such as roll pin  1354 , between tooth ends is promoted by the use of an arced surface, such as arc surface  1398 , instead of abrupt angled surfaces such as are found in other ratcheting devices. Also, less deflection of the roll pin  1354  and shorter actuation of the release lever assembly  1346  is required to transit between rounded teeth as opposed to using non-rounded teeth whose surfaces form a sharp angle. 
     Various modifications can be made to the present invention without departing from the apparent scope hereof. 
     
       
         
               
             
               
               
               
             
           
               
                   
               
               
                 MOUNTING SYSTEMS FOR FLAT 
               
               
                 PANEL DISPLAY OR KEYBOARD 
               
               
                 PARTS LIST 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                  10 
                 vertical surface 
               
               
                   
                   
                 mount 
               
               
                   
                  12 
                 track plate 
               
               
                   
                  14 
                 track plate 
               
               
                   
                  16 
                 flat panel 
               
               
                   
                   
                 display 
               
               
                   
                  18 
                 angled bracket 
               
               
                   
                   
                 assembly 
               
               
                   
                  20 
                 angled bracket 
               
               
                   
                   
                 assembly 
               
               
                   
                  22 
                 pivotal support 
               
               
                   
                   
                 bracket or arm 
               
               
                   
                   
                 elevation bracket 
               
               
                   
                  24 
                 support arm 
               
               
                   
                  24a 
                 inboard end 
               
               
                   
                  24b 
                 outboard end 
               
               
                   
                  25 
                 gas spring 
               
               
                   
                  26 
                 vertical axis 
               
               
                   
                  28 
                 horizontal axis 
               
               
                   
                  30 
                 three-axis pivot 
               
               
                   
                  32 
                 pivot assembly 
               
               
                   
                  34 
                 pivot assembly 
               
               
                   
                  36 
                 pivot assembly 
               
               
                   
                  38 
                 component mount or 
               
               
                   
                   
                 bracket 
               
               
                   
                  38a 
                 planar portion 
               
               
                   
                  40 
                 vertical axis 
               
               
                   
                  42 
                 horizontal axis 
               
               
                   
                  44 
                 roll axis 
               
               
                   
                  46 
                 vertical oriented 
               
               
                   
                   
                 flange 
               
               
                   
                  48 
                 vertical oriented 
               
               
                   
                   
                 flange 
               
               
                   
                  50 
                 angle bracket 
               
               
                   
                  52 
                 angle bracket 
               
               
                   
                  54 
                 UHMWPE disk 
               
               
                   
                  56 
                 UHMWPE disk 
               
               
                   
                  58 
                 bolt 
               
               
                   
                  59 
                 Belleville washer 
               
               
                   
                  60 
                 Belleville washer 
               
               
                   
                  62 
                 nut 
               
               
                   
                  64 
                 angle bracket 
               
               
                   
                  66 
                 angle bracket 
               
               
                   
                  68 
                 angle bracket 
               
               
                   
                  70 
                 angle bracket 
               
               
                   
                  72 
                 UHMWPE disk 
               
               
                   
                  74 
                 UHMWPE disk 
               
               
                   
                  76 
                 bolt 
               
               
                   
                  77 
                 Belleville washer 
               
               
                   
                  78 
                 Belleville washer 
               
               
                   
                  80 
                 nut 
               
               
                   
                  82 
                 angle bracket 
               
               
                   
                  84 
                 angle bracket 
               
               
                   
                  86 
                 plate 
               
               
                   
                  88 
                 UHMWPE disk 
               
               
                   
                  90 
                 bolt 
               
               
                   
                  92 
                 Belleville washer 
               
               
                   
                  94 
                 nut 
               
               
                   
                  96 
                 central bracket 
               
               
                   
                  98 
                 angled support 
               
               
                   
                   
                 bracket 
               
               
                   
                  98a 
                 planar portion 
               
               
                   
                  98b 
                 planar portion 
               
               
                   
                  100 
                 angled support 
               
               
                   
                   
                 bracket 
               
               
                   
                  100a 
                 planar portion 
               
               
                   
                 100b 
                 planar portion 
               
               
                   
                  102 
                 central planar 
               
               
                   
                   
                 area 
               
               
                   
                  104 
                 planar member 
               
               
                   
                  104a 
                 semi-circular member 
               
               
                   
                  106 
                 planar member 
               
               
                   
                  106a 
                 semi-circular member 
               
               
                   
                  108 
                 UHMWPE disk 
               
               
                   
                  110 
                 UHMWPE disk 
               
               
                   
                  112 
                 left support arm 
               
               
                   
                   
                 member 
               
               
                   
                  112a 
                 disk-like portion 
               
               
                   
                  112b 
                 planar member 
               
               
                   
                  112c 
                 flange 
               
               
                   
                  114 
                 right support arm 
               
               
                   
                   
                 member 
               
               
                   
                  114a 
                 disk-like portion 
               
               
                   
                  114b 
                 planar member 
               
               
                   
                  114c 
                 flange 
               
               
                   
                  116 
                 captive stud 
               
               
                   
                  118 
                 oilite bearing 
               
               
                   
                  119 
                 oilite washer 
               
               
                   
                  120 
                 oilite washer 
               
               
                   
                  121 
                 hole 
               
               
                   
                  122 
                 steel washer 
               
               
                   
                  123 
                 hole 
               
               
                   
                  124 
                 Belleville washer 
               
               
                   
                  126 
                 nut 
               
               
                   
                  128 
                 captive stud 
               
               
                   
                  132 
                 steel washer 
               
               
                   
                  134 
                 Belleville washer 
               
               
                   
                  136 
                 nut 
               
               
                   
                  140 
                 gas spring mount 
               
               
                   
                  142 
                 threaded shaft 
               
               
                   
                  144 
                 nut 
               
               
                   
                  146 
                 nut 
               
               
                   
                  148 
                 slot 
               
               
                   
                  150 
                 tab 
               
               
                   
                  152 
                 tab 
               
               
                   
                  154 
                 threaded hole 
               
               
                   
                  156 
                 tab 
               
               
                   
                  158 
                 tab 
               
               
                   
                  160 
                 pivot bolt 
               
               
                   
                  162 
                 pivot tab 
               
               
                   
                  164 
                 pivot tab 
               
               
                   
                  166 
                 bolt 
               
               
                   
                  168 
                 Belleville washer 
               
               
                   
                  170 
                 UHMWPE washer 
               
               
                   
                  172 
                 threaded insert 
               
               
                   
                  174 
                 bolt 
               
               
                   
                  176 
                 Belleville washer 
               
               
                   
                  178 
                 UHMWPE washer 
               
               
                   
                  180 
                 threaded insert 
               
               
                   
                  182 
                 semi-circular slot 
               
               
                   
                  183 
                 outboard end 
               
               
                   
                  184 
                 pivot pin 
               
               
                   
                  186 
                 plastic spacer 
               
               
                   
                  188 
                 plastic spacer 
               
               
                   
                  190 
                 pivot arc 
               
               
                   
                  191 
                 pivot range 
               
               
                   
                  210 
                 vertical surface 
               
               
                   
                   
                 mount 
               
               
                   
                  216 
                 flat panel display 
               
               
                   
                  222 
                 pivotal support 
               
               
                   
                   
                 bracket 
               
               
                   
                  224 
                 support arm 
               
               
                   
                  224a 
                 inboard end 
               
               
                   
                  224b 
                 outboard end 
               
               
                   
                  225 
                 gas spring 
               
               
                   
                  228 
                 horizontal axis 
               
               
                   
                  230 
                 single-axis pivot 
               
               
                   
                  238 
                 component mount or 
               
               
                   
                   
                 bracket 
               
               
                   
                  240 
                 horizontal axis 
               
               
                   
                  246 
                 vertically oriented 
               
               
                   
                   
                 flange 
               
               
                   
                  248 
                 vertically 
               
               
                   
                   
                 oriented flange 
               
               
                   
                  250 
                 angle bracket 
               
               
                   
                  252 
                 angle bracket 
               
               
                   
                  254 
                 UHMWPE disk 
               
               
                   
                  256 
                 UHMWPE disk 
               
               
                   
                  258 
                 bolt 
               
               
                   
                  259 
                 Belleville washer 
               
               
                   
                  260 
                 Belleville washer 
               
               
                   
                  262 
                 nut 
               
               
                   
                  264 
                 angle bracket 
               
               
                   
                  266 
                 angle bracket 
               
               
                   
                  296 
                 central bracket 
               
               
                   
                  302 
                 central planar 
               
               
                   
                   
                 area 
               
               
                   
                  304 
                 planar member 
               
               
                   
                  304a 
                 semi-circular 
               
               
                   
                   
                 member 
               
               
                   
                  304b 
                 bracket tab 
               
               
                   
                  306 
                 planar member 
               
               
                   
                  306a 
                 semi-circular 
               
               
                   
                   
                 member 
               
               
                   
                  306b 
                 bracket tab 
               
               
                   
                  308 
                 UHMWPE disk 
               
               
                   
                  310 
                 UHMWPE disk 
               
               
                   
                  312 
                 left support arm 
               
               
                   
                   
                 member 
               
               
                   
                  312a 
                 disk-like portion 
               
               
                   
                  312b 
                 planar member 
               
               
                   
                  312c 
                 flange 
               
               
                   
                  314 
                 right support arm 
               
               
                   
                   
                 member 
               
               
                   
                  314a 
                 disk-like portion 
               
               
                   
                  314b 
                 planar member 
               
               
                   
                  314c 
                 flange 
               
               
                   
                  316 
                 captive stud 
               
               
                   
                  318 
                 oilite bearing 
               
               
                   
                  319 
                 oilite washer 
               
               
                   
                  320 
                 oilite washer 
               
               
                   
                  321 
                 hole 
               
               
                   
                  322 
                 steel washer 
               
               
                   
                  323 
                 hole 
               
               
                   
                  324 
                 Belleville washer 
               
               
                   
                  326 
                 nut 
               
               
                   
                  328 
                 captive stud 
               
               
                   
                  332 
                 steel washer 
               
               
                   
                  334 
                 Belleville washer 
               
               
                   
                  336 
                 nut 
               
               
                   
                  340 
                 gas spring mount 
               
               
                   
                  342 
                 threaded shaft 
               
               
                   
                  344 
                 nut 
               
               
                   
                  346 
                 nut 
               
               
                   
                  348 
                 slot 
               
               
                   
                  350 
                 tab 
               
               
                   
                  352 
                 tab 
               
               
                   
                  354 
                 threaded hole 
               
               
                   
                  356 
                 tab 
               
               
                   
                  358 
                 tab 
               
               
                   
                  360 
                 pivot bolt 
               
               
                   
                  383 
                 outboard end 
               
               
                   
                  384 
                 pivot pin 
               
               
                   
                  386 
                 plastic spacer 
               
               
                   
                  388 
                 plastic spacer 
               
               
                   
                  390 
                 arc 
               
               
                   
                  400 
                 horizontal 
               
               
                   
                   
                 surface or 
               
               
                   
                   
                 ceiling track 
               
               
                   
                   
                 mount 
               
               
                   
                  401 
                 ceiling mounted 
               
               
                   
                   
                 track 
               
               
                   
                  402 
                 support bracket 
               
               
                   
                  404 
                 track wheel 
               
               
                   
                  405 
                 track wheel 
               
               
                   
                  406 
                 track wheel 
               
               
                   
                  407 
                 track wheel 
               
               
                   
                  408 
                 pivotal support 
               
               
                   
                   
                 bracket or arm 
               
               
                   
                   
                 elevation bracket 
               
               
                   
                  410 
                 vertical axis 
               
               
                   
                  412 
                 bolt 
               
               
                   
                  413 
                 Belleville washer 
               
               
                   
                  414 
                 steel washer 
               
               
                   
                  416 
                 UHMWPE disk 
               
               
                   
                  418 
                 Belleville washer 
               
               
                   
                  420 
                 nut 
               
               
                   
                  422 
                 gas spring mount 
               
               
                   
                  424 
                 threaded shaft 
               
               
                   
                  426 
                 nut 
               
               
                   
                  428 
                 nut 
               
               
                   
                  430 
                 single-axis pivot 
               
               
                   
                  432 
                 support arm 
               
               
                   
                  510 
                 tabletop mount 
               
               
                   
                  512 
                 angled base 
               
               
                   
                  512a 
                 planar member 
               
               
                   
                  514 
                 recessed hole 
               
               
                   
                  516 
                 flat panel display 
               
               
                   
                  522 
                 pivotal support 
               
               
                   
                   
                 bracket and arm 
               
               
                   
                   
                 elevation bracket 
               
               
                   
                   
                 assembly 
               
               
                   
                  523 
                 vertical axis 
               
               
                   
                  524 
                 support arm 
               
               
                   
                  525 
                 gas spring 
               
               
                   
                  530 
                 single-axis pivot 
               
               
                   
                  538 
                 component mount 
               
               
                   
                   
                 or bracket 
               
               
                   
                  546 
                 flange 
               
               
                   
                  548 
                 flange 
               
               
                   
                  550 
                 angle bracket 
               
               
                   
                  552 
                 angle bracket 
               
               
                   
                  554 
                 UHMWPE disk 
               
               
                   
                  556 
                 UHMWPE disk 
               
               
                   
                  559 
                 Belleville washer 
               
               
                   
                  560 
                 Belleville washer 
               
               
                   
                  562 
                 nut 
               
               
                   
                  564 
                 angle bracket 
               
               
                   
                  566 
                 angle bracket 
               
               
                   
                  604 
                 bracket planar 
               
               
                   
                   
                 member 
               
               
                   
                  606 
                 bracket planar 
               
               
                   
                   
                 member 
               
               
                   
                  608 
                 UHMWPE disk 
               
               
                   
                  610 
                 UHMWPE disk 
               
               
                   
                  612 
                 left support arm 
               
               
                   
                   
                 member 
               
               
                   
                  612a 
                 disk-like portion 
               
               
                   
                  614 
                 right support arm 
               
               
                   
                  614a 
                 disk-like portion 
               
               
                   
                  616 
                 captive stud 
               
               
                   
                  619 
                 oilite washer 
               
               
                   
                  620 
                 oilite washer 
               
               
                   
                  622 
                 steel washer 
               
               
                   
                  624 
                 Belleville washer 
               
               
                   
                  626 
                 nut 
               
               
                   
                  628 
                 captive stud 
               
               
                   
                  632 
                 steel washer 
               
               
                   
                  634 
                 Belleville washer 
               
               
                   
                  636 
                 nut 
               
               
                   
                  640 
                 gas spring mount 
               
               
                   
                  642 
                 threaded shaft 
               
               
                   
                  660 
                 pivot bolt 
               
               
                   
                  684 
                 pivot pin 
               
               
                   
                  686 
                 plastic spacer 
               
               
                   
                  688 
                 plastic spacer 
               
               
                   
                  690 
                 nut 
               
               
                   
                  692 
                 nut 
               
               
                   
                  694 
                 bolt 
               
               
                   
                  696 
                 Belleville washer 
               
               
                   
                  698 
                 steel washer 
               
               
                   
                  700 
                 UHMWPE disk 
               
               
                   
                  702 
                 Belleville washer 
               
               
                   
                  704 
                 nut 
               
               
                   
                  800 
                 tabletop mount 
               
               
                   
                  802 
                 support arm 
               
               
                   
                  810 
                 steel coil spring 
               
               
                   
                 1000 
                 keyboard support 
               
               
                   
                   
                 system 
               
               
                   
                 1010 
                 keyboard tray 
               
               
                   
                 1012 
                 mouse pad tray 
               
               
                   
                 1014 
                 support arm 
               
               
                   
                 1016 
                 fixed portion 
               
               
                   
                 1018 
                 mounting lip 
               
               
                   
                 1020a-n 
                 mounting holes 
               
               
                   
                 1021a-n 
                 nut and screw 
               
               
                   
                   
                 combinations 
               
               
                   
                 1022 
                 cable access hole 
               
               
                   
                 1024 
                 cable access hole 
               
               
                   
                 1026 
                 cable access hole 
               
               
                   
                 1028 
                 slide plate 
               
               
                   
                 1030 
                 right extended 
               
               
                   
                   
                 member 
               
               
                   
                 1032 
                 left extended member 
               
               
                   
                 1034 
                 slot 
               
               
                   
                 1036 
                 slot 
               
               
                   
                 1038 
                 front lip 
               
               
                   
                 1040 
                 machine screw 
               
               
                   
                 1042 
                 machine screw 
               
               
                   
                 1044 
                 planar surface 
               
               
                   
                 1046 
                 lip 
               
               
                   
                 1048 
                 lip 
               
               
                   
                 1050 
                 lip 
               
               
                   
                 1052 
                 lip 
               
               
                   
                 1054 
                 contiguous slide 
               
               
                   
                   
                 plate 
               
               
                   
                 1056 
                 upper planar member 
               
               
                   
                 1058 
                 lower planar member 
               
               
                   
                 1060 
                 intermediate portion 
               
               
                   
                 1062 
                 slot 
               
               
                   
                 1064 
                 machine screw 
               
               
                   
                 1064a 
                 knob 
               
               
                   
                 1066 
                 machine screw 
               
               
                   
                 1066a 
                 knob 
               
               
                   
                 1068 
                 slide channel 
               
               
                   
                 1070 
                 slide channel 
               
               
                   
                 1072 
                 pivot/brake assembly 
               
               
                   
                 1074 
                 U-shaped bracket 
               
               
                   
                 1074a 
                 left member 
               
               
                   
                 1074b 
                 right member 
               
               
                   
                 1076 
                 angled bracket 
               
               
                   
                 1078 
                 angled bracket 
               
               
                   
                 1080 
                 angled bracket 
               
               
                   
                 1082 
                 angled bracket 
               
               
                   
                 1084 
                 bolt 
               
               
                   
                 1086 
                 threaded shaft 
               
               
                   
                 1088 
                 UHMWPE disk 
               
               
                   
                 1090 
                 UHMWPE disk 
               
               
                   
                 1092 
                 steel washer 
               
               
                   
                 1094 
                 steel washer 
               
               
                   
                 1096 
                 nut 
               
               
                   
                 1098 
                 nut 
               
               
                   
                 1100 
                 friction assembly 
               
               
                   
                 1102 
                 brake assembly 
               
               
                   
                 1104 
                 Belleville washer 
               
               
                   
                 1106 
                 washer 
               
               
                   
                 1108 
                 brake handle 
               
               
                   
                 1110a-n 
                 nuts 
               
               
                   
                 1112a-n 
                 mounting bolts 
               
               
                   
                 1200 
                 rolling cart 
               
               
                   
                   
                 assembly 
               
               
                   
                 1210 
                 base 
               
               
                   
                 1212a-n 
                 casters 
               
               
                   
                 1214 
                 mounting pole 
               
               
                   
                 1216a-n 
                 pole mounting 
               
               
                   
                   
                 brackets 
               
               
                   
                 1218 
                 mail tray bracket 
               
               
                   
                 1220 
                 UPS mounting bracket 
               
               
                   
                 1300 
                 pivot/ratchet 
               
               
                   
                   
                 assembly 
               
               
                   
                 1302 
                 U-shaped bracket 
               
               
                   
                 1302a 
                 planar portion 
               
               
                   
                 1302b 
                 left planar member 
               
               
                   
                 1302c 
                 right planar member 
               
               
                   
                 1304a-n 
                 mounting holes 
               
               
                   
                 1306 
                 pivot stud 
               
               
                   
                 1308 
                 pivot stud 
               
               
                   
                 1310 
                 smoothed ratchet 
               
               
                   
                   
                 teeth array 
               
               
                   
                 1312 
                 smoothed ratchet 
               
               
                   
                   
                 teeth array 
               
               
                   
                 1314 
                 UHMWPE washer 
               
               
                   
                 1316 
                 angle bracket 
               
               
                   
                 1316a 
                 large planar member 
               
               
                   
                 1316b 
                 small planar member 
               
               
                   
                 1318 
                 large pivot hole 
               
               
                   
                 1319a-b 
                 mounting holes 
               
               
                   
                 1320 
                 Belleville washer 
               
               
                   
                 1322 
                 thrust washer 
               
               
                   
                 1324 
                 Nylock nut 
               
               
                   
                 1326 
                 UHMWPE washer 
               
               
                   
                 1328 
                 angle bracket 
               
               
                   
                 1328a 
                 large planar 
               
               
                   
                   
                 member 
               
               
                   
                 1328b 
                 small planar 
               
               
                   
                   
                 member 
               
               
                   
                 1329a-b 
                 mounting holes 
               
               
                   
                 1330 
                 large pivot hole 
               
               
                   
                 1332 
                 Belleville washer 
               
               
                   
                   
                 thrust washer 
               
               
                   
                 1336 
                 Nylock nut 
               
               
                   
                 1338 
                 upper pivot hole 
               
               
                   
                 1340 
                 lower hole 
               
               
                   
                 1342 
                 upper pivot hole 
               
               
                   
                 1344 
                 lower hole 
               
               
                   
                 1346 
                 release lever 
               
               
                   
                   
                 assembly 
               
               
                   
                 1348 
                 body member 
               
               
                   
                 1350 
                 pivot pin 
               
               
                   
                 1352 
                 roll pin 
               
               
                   
                 1354 
                 roll pin 
               
               
                   
                 1356 
                 release tab 
               
               
                   
                 1357 
                 central planar 
               
               
                   
                   
                 portion 
               
               
                   
                 1358 
                 outer left tab 
               
               
                   
                 1360 
                 outer right tab 
               
               
                   
                 1362 
                 pivot hole 
               
               
                   
                 1364 
                 pivot hole 
               
               
                   
                 1366 
                 hole 
               
               
                   
                 1368 
                 hole 
               
               
                   
                 1370 
                 press-on nut 
               
               
                   
                 1372 
                 press-on nut 
               
               
                   
                 1374 
                 inner left tab 
               
               
                   
                 1376 
                 inner right tab 
               
               
                   
                 1378 
                 hole 
               
               
                   
                 1380 
                 hole 
               
               
                   
                 1382 
                 rubber block 
               
               
                   
                 1384 
                 rubber block 
               
               
                   
                 1386 
                 radius line 
               
               
                   
                 1388 
                 tooth 
               
               
                   
                 1390 
                 tooth 
               
               
                   
                 1392 
                 flat surface 
               
               
                   
                 1394 
                 arced portion 
               
               
                   
                 1396 
                 flat surface 
               
               
                   
                 1398 
                 arc surface 
               
               
                   
                 1400 
                 tooth