Patent Publication Number: US-11033102-B2

Title: Height adjustable desktop work surface

Description:
CLAIM OF PRIORITY 
     This patent application is a continuation of U.S. patent application Ser. No. 15/892,167, entitled “HEIGHT ADJUSTABLE DESKTOP WORK SURFACE,” filed on Feb. 8, 2018, to Mustafa A. Ergun et al., which is a continuation of U.S. patent application Ser. No. 14/971,227, entitled “HEIGHT ADJUSTABLE DESKTOP WORK SURFACE,” filed on Dec. 16, 2015, to Mustafa A. Ergun et al., which is a continuation of U.S. patent application Ser. No. 14/686,465, entitled “HEIGHT ADJUSTABLE DESKTOP WORK SURFACE,” filed on Apr. 14, 2015, to Mustafa A. Ergun et al., which claims the benefit of priority, under 35 U.S.C. Section 119(e), to Mustafa A. Ergun et al., U.S. Patent Application Ser. No. 61/979,265, entitled “HEIGHT ADJUSTABLE DESKTOP WORK SURFACE,” filed on Apr. 14, 2014 and Mustafa A. Ergun, U.S. Patent Application Ser. No. 62/053,880, entitled “HEIGHT ADJUSTABLE DESKTOP WORKSTATION,” filed on Sep. 23, 2014, the benefit of priority of each of which is claimed hereby, and each of which are incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD 
     This document pertains generally, but not by way of limitation, to a desktop assembly for providing a height adjustable work surface. 
     BACKGROUND 
     Conventional desks include a planar desktop providing a work surface and for receiving a computer monitor, computer peripherals or other desktop items. Typically, the desktop is mounted at a horizontal position to provide a flat surface for receiving and retaining desktop items. Similarly, the desktop is positioned at a height that corresponds to a position at which a seated person can comfortably use the desk. Recently, desk users have sought to use desks while standing to prevent back strain and other injuries that result from extended seated use of the desk and in particular computer use, which often results in the user being hunched over the desktop. In particular, recent information has indicated that alternating between standing and sitting while using a desk for extending periods of time has beneficial health benefits. 
     An approach for providing standing use of a desk for computer use is a computer mount including a vertical riser mountable to the work surface of a desk. Fixed or height adjustable mounts for a computer monitor and/or keyboard can be secured to the vertical riser at appropriate heights for standing or alternating between sitting and standing use of the computer. A drawback of this approach is that the monitor is typically fixed to the work surface to avoid tipping. Risers can be fixed to the work surface with an edge clamp, grommet mount or other clamping apparatuses. A drawback of clamping apparatus is that the existing desktop may have to be modified by drilling holes or removing edge sections of the desktop. The substantial and permanent modification of the desk requires substantial investment and can render the desktop unsuitable for its original intended use or other uses. 
     OVERVIEW 
     The present inventors have recognized, among other things, that a problem to be solved can include providing a stable, height adjustable work surface that is sufficiently sized for computer and other uses. In addition, the present inventors have recognized that a related problem to be solved can include converting fixed height desks to a sit-to-stand desk by incorporating a height adjustable work surface. In an example, the present subject matter can provide a solution to this problem, such as by providing a height adjustable work surface that can be set or located on a fixed height desk to convert the fixed height desk. In an example, the height adjustable work surface can have a foot assembly and a linkage assembly that adjustably connects the work surface to the foot assembly allowing vertical adjustment of the work surface relative to the foot assembly. In at least one example, the foot assembly can be placed on or releasably mounted to a work surface of a fixed height desk to provide a stable, height adjustable work surface on the fixed height desk. 
     In an example, the linkage assembly can include one or more adjustment assemblies, each having at least two parallel linkages and a transverse linkage that maintains the work surface in a generally horizontal orientation as the work surface is elevated or lowered. One of the parallel linkages can rotate in a first plane while the second rotating linkage can rotate in second plane parallel to and offset from the first plane. The offset of the planes can reduce torqueing of the of the work surface relative to the foot assembly. In at least one example, each adjustment assembly can include a gliding upper bar that moves a glide support to elevate and lower the work surface and can also operate to maintain the work surface in a generally horizontal orientation. In at least one example, each adjustment assembly can include a biasing mechanism such as an extension spring or a torsion spring that biases the work surface toward the elevated position. In at least one example, each adjustment assembly can include a gliding upper bar that moves a glide support to elevate and lower the work surface and can also operate to maintain the work surface in a generally horizontal orientation. In this configuration, the glide rod can include a plurality of indentations that can be rotated between a first position in which the notches engage the glider to prevent adjustment of the work surface and a second position allowing lowering and raising of the work surface. 
     In at least one example, each adjustment assembly can include a lock lever assembly including a plunger pin that engages one of a plurality of holes in the transverse linkage to fix adjustment assembly preventing elevating or lowering of the work surface. 
     In an example, the height adjustable desktop can include at least one clamping member such as a clamp, a grommet, a vise, a clip, or an alternative type of fastener for securing the height adjustable desktop to a desktop, table, desk frame, wall or other structure. Securing the base foot assembly or other portion of the height adjustable desktop assembly to the desktop can improve the stability of the work surface during uses such as typing. In at least one example, each clamping members can be located in the front of the foot assembly or base and in another example; one or more clamping members can be located at the rear. In another example, a grommet mount can be used to attach the base to the desktop. The grommet mount can allow the height adjustable desk assembly to be rotated relative to the underlying supporting surface. 
     In an example, a height adjustable desktop system can include a work surface, a foot assembly and an adjustment assembly. The work surface can define an underside and include a glide support and a support bracket positioned on the underside of the work surface. The foot assembly can include at least one foot bracket. The adjustment assembly can include a glider slidable on the glide support, a first linkage rotatably connected to the glider and rotatably connected to the foot bracket, a second linkage rotatable with the first linkage, the second linkage rotatably connected to the glider and rotatably connected to the foot bracket, and a transverse linkage rotatably connected to the support bracket and rotatably connected to the second linkage. The glider can be slid on the glide support between a first position proximate to the support bracket and a second position distal to the support bracket; wherein the first, second and transverse linkages can be extended when the glide is positioned in the first position to position the work surface at an elevated position, wherein the first, second and transverse linkages can be collapsed when the glide is positioned in the second position to position the work surface at a lowered position. 
     In an example, the glide support can include a glide rod defining a plurality of indentations. In this configuration, the glider can define a first glide hole and a second glide hole aligned with the first glide hole, wherein the glide rod can be receivable in the first and second glide hole such that the glider is slidable on the glide rod. The second glide hole can define a flat edge. The glide rod can be rotated between a first position in which the indentations can be aligned to engage the flat edge to prevent sliding of the glider on the glide rod and a second position in which the indentations are out of alignment with the flat edge to allow sliding of the glider on the glide rod. 
     In an example, the transverse linkage can include a fan portion and defines a plurality of holes in the fan portion arranged in an arc. The height adjustable desktop system can also include a piston having a piston pin. The piston pin can be moved between an extended position in which the pin intersects one of the holes to prevent rotation of the transverse linkage and fixing elevation of the work surface and a retracted position allowing rotation of the transverse linkage permitting movement of the work surface. 
     This overview is intended to provide an overview of subject matter of the present patent application. It is not intended to provide an exclusive or exhaustive explanation of the present subject matter. The detailed description is included to provide further information about the present patent application. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document. 
         FIG. 1  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 2  is a schematic side view of the height adjustable desktop system depicted in  FIG. 1  having the work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 3  is a schematic side view of the height adjustable desktop system depicted in  FIG. 1  having the work surface including a shelf positioned in a lowered position, according to an example of the present disclosure. 
         FIG. 4  is a front view of the height adjustable desktop system depicted in  FIG. 1  in accordance to an example of the present disclosure. 
         FIG. 5  is a schematic front view of the height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 6  is a schematic front view of the height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 7  is a schematic side view of a height adjustable desktop system having a work surface including a shelf positioned in a lowered position, according to an example of the present disclosure. 
         FIG. 8  is a schematic side view of a height adjustable desktop system having a work surface including a shelf positioned in a lowered position, according to an example of the present disclosure. 
         FIG. 9  is a schematic side view of a height adjustable desktop system having a clamping member, according to an example of the present disclosure. 
         FIG. 10  is a schematic side view of a height adjustable desktop system having a clamping member, according to an example of the present disclosure. 
         FIG. 11  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 12  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure, wherein an extension spring operably linking a glider to a transverse linkage. 
         FIG. 13  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure, wherein an extension spring operably linking a glider to a spring holding bracket affixed to the work surface. 
         FIG. 14  is a schematic side view of the height adjustable desktop system depicted in  FIG. 7  having a work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 15  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure, wherein a torsion spring is positioned bias the work surface to the elevated position. 
         FIG. 16  is a schematic side view of the height adjustable desktop system depicted in  FIG. 15  having a work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 17  is a schematic side view of a height adjustable desktop system having a work surface in an elevated position and having a wall bracket for mounting the system to a wall, according to an example of the present disclosure. 
         FIG. 18  is a perspective view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 19  is a side view of the height adjustable desktop system having a work surface depicted in  FIG. 18 . 
         FIG. 20  is a front view of the height adjustable desktop system having a work surface depicted in  FIG. 18 . 
         FIG. 21  is a side view of the height adjustable desktop system depicted in  FIG. 18  having the work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 22  is a side view of the height adjustable desktop system depicted in  FIG. 18  having the work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 23  is partial front view of a height adjustable desktop system illustrating a lever for a glide rod, according to an example of the present disclosure. 
         FIG. 24  is a partial perspective view of a height adjustable desktop system, according to an example of the present disclosure. 
         FIG. 25  is a perspective view of a glider rod, support frame and glider assembly, according to an example of the present disclosure. 
         FIG. 26  is a perspective view of a glider, according to an example of the present disclosure. 
         FIG. 27  is a perspective view of a glider rod, according to an example of the present disclosure. 
         FIG. 28  is a top view of a lever of a glider rod, according to an example of the present disclosure. 
         FIG. 29  is a partial cross-sectional view of a glider rod, according to an example of the present disclosure. 
         FIG. 30  is a perspective view of a height adjustable desktop system having a work surface in an elevated position, according to an example of the present disclosure. 
         FIG. 31  is a side view of the height adjustable desktop system having a work surface depicted in  FIG. 30  of the present disclosure. 
         FIG. 32  is a side view of the height adjustable desktop system depicted in  FIG. 30  having the work surface positioned in an intermediate lowered position, according to an example of the present disclosure. 
         FIG. 33  is a front view of the height adjustable desktop system having a work surface depicted in  FIG. 24  of the present disclosure. 
         FIG. 34  is a partial perspective view of a lock lever assembly according to an example of the present disclosure. 
         FIG. 35  is a partial cross-sectional side view of a lock lever assembly according to an example of the present disclosure. 
         FIG. 36  is a perspective view of a height adjustable desktop system having a lower lock assembly, with a work surface positioned in an elevated position, according to an example of the present disclosure. 
         FIG. 37  is a perspective view of a height adjustable desktop system having a lower lock assembly, with a work surface positioned in a lowered and locked position, according to an example of the present disclosure. 
         FIG. 38  is a perspective view of a lever having a locking arm according to an example of the present disclosure. 
         FIG. 39  is a partial perspective view of a height adjustable desktop system locked into a lowered position according to an example of the present disclosure. 
         FIG. 40  is a cross-sectional perspective view of a height adjustable desktop system locked into a lowered position according to an example of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     As depicted in  FIGS. 1-3 , a height adjustable desktop system  100 , according to an example of the present disclosure, can include a work surface  102 , a linkage assembly  104  and a foot assembly  106 . The work surface  102  provides a planar surface for writing or receiving desktop items such as computer peripherals. The foot assembly  106  is configured to be placed on a desktop  99  of a desk, secured to the frame of the desk or secured to a wall or other structure. The linkage assembly  104  operably connects the work surface  102  to the foot assembly  106 . The linkage assembly  104  is configured to position the work surface  102  for vertical height adjustment of the work surface  102  and permitting use of the work surface  102  while seated, standing or in other positions. As illustrated in  FIG. 2 , in an example, the linkage assembly  104  can elevate as depicted in  FIG. 1  or lower the work surface  102  relative to the foot assembly  106  as depicted in  FIG. 3 . 
     As depicted in  FIGS. 1-6 , the work surface  102  can define a primary top surface  108  and an underside  110 . The top surface  108  can be planar to provide a flat surface for writing or receiving desktop items. In an example, the primary top surface  108  can include a high friction surface to prevent desktop items from sliding on the primary top surface  108  while the work surface  102  is being elevated or lowered by the linkage assembly  104 . As depicted in  FIG. 4 , in at least one example, the work surface  102  can include at least one glide support  112  and a support bracket  114  arranged on the underside  110  of the work surface  102  along an axis. In this configuration, a first adjustment assembly  120   a  can be located proximate the center of the work surface  102 . The foot assembly  106  can be large enough to maintain stability of the work surface  102  during use of the height adjustable desktop system  100 . 
     As depicted in  FIGS. 7-8 , in an example, the work surface  102  can include a shelf  116  defining a secondary top surface  118  for use as a keyboard tray or other purposes providing a bi-level work surface. In at least one example, the secondary top surface  118  can be located at a lower height than the primary top surface  108 . In this configuration, the lower secondary top surface  118  can permit use of certain peripherals at a lower height relative to the primary top surface  108  to position the peripherals at a more ergonomic operating position for the user&#39;s hands while the relatively higher primary top surface  108  positions other peripherals, such as computer monitors, at a more ergonomic viewing position for the user&#39;s head and eyes. For example, the peripherals for use on the secondary top surface  118  can include, but not limited to computer monitors, keyboards, mice, speakers, boon microphones and other peripherals commonly used with computers. As depicted in  FIG. 7 , in an example, the secondary top surface  118  can rest against the foot assembly  106  on the desktop  99  in the lowered position  144 . As depicted in  FIG. 8 , in an example, the secondary top surface  118  can extend forward of the front  140  of the desktop  99  and can include a lowered position  144  that can be lower than the surface of the foot assembly  106  or the surface of the desktop  99 . In this configuration, the secondary top surface  118  can be positioned at a height about or below the primary top surface  108 . As depicted in  FIGS. 18-22 and 30 , in at least one example, the work surface  102  can include at least one attachment bracket  119  for releasably securing the shelf  116  to the work surface  102 . As depicted in  FIG. 5 , in at least one example, 
     As depicted in  FIGS. 5-6 , in at least one example, the work surface  102  can include a first glide support  112   a  and a first support bracket  114   a  arranged on the underside  110  of the work surface  102  along a first axis. In this configuration, the work surface  102  also can include a second glide support  112   b  and a second support bracket  114   b  arranged on the underside  110  of the work surface  102  along a second axis parallel to the first axis. In this configuration, the first support bracket  114   a  and the second support bracket  114   b  cooperate to support the work surface  102 . In at least one example, the work surface  102  further can include a back bracket  115  joining the first and second glide supports  112   a ,  112   b.    
     As depicted in  FIGS. 5-6 , the linkage assembly  104  can include a first adjustment assembly  120   a  and a second adjustment assembly  120   b . Whether the linkage assembly  104  includes only one adjustment assembly or additional adjustment assemblies, the following description may use the “first adjustment assembly” nomenclature and element numbering in various examples. The work surface  102  can include a first glide support  112   a  and a first support bracket  114   a  arranged on the underside  110  of the work surface  102  along a first axis. Each adjustment assembly  120   a ,  120   b  can include a first parallel linkage  122 , a second parallel linkage  124  and a transverse linkage  126 . Each adjustment assembly  120   a ,  120   b  also can include a glider  128  configured to slide on one of the glide supports  112   a ,  112   b . The first adjustment assembly  120   a  can be located proximate to a first edge  145   a  of the work surface  102 . The second adjustment assembly  120   b  can be located proximate to a second edge  145   b  of the work surface  102  which can be opposite the first edge  145   a . The first and second adjustment assemblies  120   a ,  120   b  can be operationally connected to the work surface  102  on the upper end, such as at the underside  110 , and operationally connected to the foot assembly  106  at the lower end. The foot assembly  106  can include an individual foot portion  132  for each adjustment assembly  120   a ,  120   b  as illustrated in  FIG. 5 , or in some configurations, the foot assembly  106  can be formed as a base  147  that spans from the first adjustment assembly  120   a  to the second adjustment assembly  120   b  as illustrated in  FIG. 6 . 
     A first lower bar  130   a  can be formed as part of the foot assembly  106 . The first lower bar  130   a  can extend upwardly from the foot assembly  106  and can be formed separately or integrally with the foot assembly  106 . The first lower bar  130   a  can be an attachment structure, a bracket, a foot bracket, or similar structure. Similarly, the second adjustment assembly  120   b  can include a second lower bar  130   b  such that the first and second parallel linkages  122 ,  124  of the second adjustment assembly  120   b  can be individually mounted to the foot portion  132 . 
     As depicted in  FIG. 1 , the first and second parallel linkages  122 ,  124  can be rotatably mounted at one end to the first lower bar  130   a  at a first hinge  148  and a second hinge  149  such that the first and second parallel linkages  122 ,  124  rotate in parallel on the first lower bar  130   a . The first and second parallel linkages  122 ,  124  can be rotatably mounted at an opposite end to the glider  128  at a third hinge  150  and a fourth hinge  151  such that the first and second parallel linkages  122 ,  124  rotate in parallel on the glider  128 . Similarly, the transverse linkage  126  can be rotatably mounted at one end to the second parallel linkage  124  by a sixth hinge  153  and rotatably mounted to the corresponding support brackets  114   a ,  114   b  through a fifth hinge  152 . In an example, the transverse linkage  126  can be rotatably mounted to the second parallel linkage  124  at about the midpoint of the second parallel linkage  124 . In an example, the transverse linkage  126  is about half the length of the second parallel linkage  124 . 
     As depicted in  FIGS. 30 and 33 , in an example, the first parallel linkages  122  of the adjustment assemblies  120   a ,  120   b  can be connected by a first cross-piece  123 . Similarly, the second parallel linkages  124  of the adjustment assemblies  120   a ,  120   b  can be connected by a second cross-piece  125 . 
     As depicted in  FIGS. 4-6 , in an example, the first and second parallel linkages  122 ,  124 , the transverse linkage  126  and combinations thereof can be offset along an axis transverse to plane of rotation of the first and second parallel linkages  122 ,  124  and the transverse linkage  126 . In this configuration, the offset prevents contact or pinching of the linkages  122 ,  124 , and  126  during rotation of the linkages  122 ,  124 , and  126 . As illustrated in  FIG. 4 , in at least one example, the first parallel linkage  122  can rotate in a first plane and the second parallel linkage  124  can rotate in a second plane. The second plane can be parallel to and offset from the first plane. The offsetting of the first and second planes can prevent torqueing of the work surface  108  relative to the foot assembly  147  during use of the work surface  108 . 
       FIGS. 1-3  illustrate side views of a height adjustable desktop system  100  and a linkage assembly  104 .  FIG. 1  illustrates an elevated position  142 ,  FIG. 2  illustrates an intermediate position  143  and  FIG. 3  illustrates a lowered position  144 . As depicted in  FIGS. 1-3 , the linkage assembly  104  can be configured with a 4-bar linkage  105  to keep the platform in horizontal orientation during the height adjustment. 
       FIGS. 1-3  illustrate the operation of the height adjustable desktop system  100 . In operation, the gliders  128  of the first and second adjustment assemblies  120   a ,  120   b  can each slide along the corresponding first and second glide support  112   a ,  112   b  between a first position  138  and a second position  139 , which correspondingly moves the work surface  102  between an elevated position  142  and a lowered position  144 ,  FIG. 2  illustrates the work surface  102  in an intermediate position  143  as the first glide support  112   a  is between a first position  138  and a second position  139 . In the first position  138 , each glider  128  can be positioned proximate to the corresponding support bracket  114   a ,  114   b  along the corresponding first and second glide support  112   a ,  112   b  such that the work surface  102  can be raised to an elevated position  142  (see  FIG. 1 ). In the elevated position  142 , the first, second and transverse linkages  122 ,  124 ,  126 , can be extended when the glider  128  is positioned in the first position  138 . In the second position  139 , each glider  128  can be located distal to the corresponding support bracket  114   a  along the corresponding first and second glide support  112   a ,  112   b  such that the work surface  102  can be located in a lowered position  144  (see  FIG. 3 ). As the work surface  102  moves from elevated position  142  to lowered position  144  by means of the linkage assembly  104 , parallel linkages  122  and  124  can maintain the horizontal orientation of the work surface  102 , and the transverse linkage  126  can maintain the vertical orientation of the work surface  102 . The first parallel linkage  122 , the second parallel linkage  124  and the transverse linkage  126  can be collapsed toward the foot assembly  106  when the glider  128  is positioned in the second position  139 . When the glider  128  reaches the second position, the work surface  102  can be at the lowered position  144 . 
     The height adjustable desktop system  100  can also be configured with a work surface  102  that is angled, such as a drafting table. The linkage assembly  104  can be configured to maintain the angle of the work surface  102  relative to the foot assembly  106  during a height adjustment. 
     The height adjustable desktop system  100  can be used as free standing on the top of a desktop  99  as illustrated in  FIGS. 1-8 . However, in some configurations, the base  147  or foot assembly  106  of the work surface  102  can be secured to the desktop  99  as illustrated in  FIGS. 9-11 . The securement can be accomplished by a clamping member such as a clamp, a grommet, a vise, a cramp, a dog, a clip, or an alternative type of fastener. In some configurations, one or more clamping members  154  can be located in front  140  of the base  147  as illustrated in  FIG. 9 . In other configurations, one or more clamping members  154  can be located at the rear  141  of the base  147  as illustrated in  FIG. 10 . Clamping members  154  can be located on any edge of the base  147  and in any number desired. Still in other configurations, a grommet mount  155  can be used to attach the base  147  to the desktop  99  as illustrated in  FIG. 11 . The grommet mount  155  can allow the height adjustable desktop system  100  to be rotated to the right or left. The grommet mount  155  can be located at the center of the base  147  or at other locations of the base  147 . The grommet mount  155  can form a rotation center of the base  147 . Multiple grommet mounts  155  can also be used. Various clamping devices are disclosed as part of the patent application Ser. No. 13/191,170, published as 2012/0187056 which is hereby incorporated by reference herein in its entirety. Clamping the base  147  of the height adjustable desktop system  100  to the desktop  99  can improve the stability of the work surface  102  during uses such as typing. 
     A counterbalance mechanism can be used for lift assist during the height adjustment to reduce the force exerted by the user. As depicted in  FIGS. 12-14 , in an example, each adjustment assembly  120   a ,  120   b  can include a counterbalance mechanism such as an extension spring  157 . The extension spring  157  can operably connect the glider  128  to the corresponding transverse linkage  126  as depicted in  FIG. 12 . As the work surface  102  is lowered and the glider  128  moves away from the corresponding support bracket  114   a ,  114   b , the extension spring  157  can be stretched (see  FIG. 14 ) to bias the work surface  102  toward the elevated position  142  (see  FIGS. 12-13 ). In certain examples, the work surface  102  can further include a spring holding bracket  158  located on the underside  110  of the work surface  102 .  FIGS. 13-14  illustrate the extension spring  157  can be operably connected to the spring holding bracket  158  rather than the transverse linkage  126  as depicted in  FIG. 12 . 
     As depicted in  FIGS. 15-16 , in an example, each adjustment assembly  120   a ,  120   b  can include a counterbalance mechanism such as a torsion spring  159 . The torsion spring  159  operably engages the transverse linkage  126  and the underside  110  of the work surface  102 . As the work surface  102  is lowered and the transverse linkage  126  collapses (see  FIG. 16 ), the torsion spring  159  is tensioned biasing the work surface  102  toward the elevated position  142  (see  FIG. 15 ). 
     As depicted in  FIGS. 5-6 and 18 , the foot assembly  106  can include a first foot bracket  130   a , a second foot bracket  130   b  and a foot portion  132 . The foot brackets  130   a ,  130   b  can be fixed to the foot portion  132 . In this configuration, the first and second parallel linkages  122 ,  124  of the first adjustment assembly  120   a  can be rotatably mounted to the foot bracket  130   a  through a hinge connection. Similarly, the first and second parallel linkages  122 ,  124  of the second adjustment assembly  120   b  can be rotatably mounted to the foot bracket  130   b  through a hinge connection. In an example, the foot portion  132  comprises a planar element for interfacing a top surface of a desktop as depicted in  FIGS. 1-16 . In an example, the foot portion  132  comprises a wall bracket  134  for receiving a fastener for securing the foot assembly  106  to a wall or other vertical surfaces such as depicted in  FIG. 17 . In at least one example, the wall bracket  134  can be configured to attach to shelf or other mounting bracket attached to the wall. In an example, the foot portion  132  comprises a U-shape element  136  having a pair of arms  137  for stabilizing the foot assembly  106  as depicted in  FIGS. 18-22 and 30-33 . In at least one example, the foot assembly  106  can include a plurality of first foot brackets  130   a  such that the first and second parallel linkages  122 ,  124  of the first adjustment assembly  120   a  can be individually mounted to the foot portion  132 . Similarly, the second foot assembly  106  can include a plurality of second foot brackets  130   b  such that the first and second parallel linkages  122 ,  124  of the second adjustment assembly  120   b  can be individually mounted to the foot portion  106 . 
     As depicted in  FIGS. 6-8 , in an example, each adjustment assembly  120   a ,  120   b  can include a counterbalance mechanism such as an extension spring  157 . The extension spring  157  operably connects the glider  128  to the corresponding transverse linkage  126  as depicted in  FIG. 6 . As the work surface  102  is lowered and the glider  128  moves away from the corresponding support bracket  114   a ,  114   b , the extension spring  157  is stretched to bias the work surface  102  toward the elevated position. 
     As depicted in  FIGS. 18-29 , in an example, each glide support  112   a ,  112   b  can include a glide rod  146  and a support frame  157 . The glide rod  146  further can include a lever  150  that can be actuated to rotate the glider rod  146 . The support frame  157  defines a pair of opposing bore holes  152  for rotatably receiving the glider rod  146 . In this configuration, each glider  128  also can include a first glide hole  154  and a second glide hole  156 , wherein the first glide hole  154  is aligned with the second glide hole  156  such that the glider  128  is slidable along the glider rod  146 . 
     As depicted in  FIGS. 24-26 and 27-29 , in an example, the glider rod  146  defines a plurality of indentations  161 , in this configuration, the first glide hole  154  of the glider  128  comprises a circular shape and is configured to receive a bushing  160  allowing the glide rod  146  to slide through the first glide hole  154  regardless of the rotational orientation of the glide rod  146 . The second glide hole  156  comprises a flat edge  162  positioned to engage the indentations  161  of the glide rod  146  to prevent movement of glider  128  along the glide rod  146 . In operation, the glide rod  146  is adapted to rotate the glide rod  146  between a first position in which the indentations  161  can be aligned with the flat edge  162  of the second glide hole  156  preventing the glider  128  from moving on the glide rod  128  and a second position in which the indentations  161  are out of alignment with the flat edge  162  allowing the glider  128  to move along the glide rod  146 . 
     As depicted in  FIGS. 30-35 , in an example, each transverse linkage  126  can include a fan portion  164  defining a plurality of holes  166  arranged in an arc. In this configuration, each adjustment assembly  120   a ,  120   b  can include a plunger  168  having a moving pin  170  extendable to engage one of the holes  166  in the transverse linkage  126  to prevent rotation of the transverse linkage  126  and raising or lowering of the work surface  120  as depicted in  FIGS. 31-32 and 35 . Similarly, the moving pin  170  can be retracted to disengage from the transverse linkage  126  to allow raising or lowering of the work surface  120  as depicted in  FIGS. 31-32 and 35 . 
     As depicted in  FIGS. 33-35 , in an example, each adjustment assembly  120   a ,  120   b  can include a lock lever assembly  172  can include a plunger bracket  174 , rotating linkage  176  and a lever bracket  178 . The plunger bracket  174  can be operably connected to the plunger pin  170  at one end and the rotatably connected to one end of the rotating linkage  176 . The lever bracket  178  can be rotatably connected to the other end of the rotating linkage  176 . In operation, pulling the lever bracket  178  rotates the rotating linkage  176  in a first direction, thereby pulling the plunger bracket  174  and retracting the pin  170  from the transverse linkage  126 . Similarly, pushing the lever bracket  178  rotates the rotating linkage  176  in a second direction, thereby pushing the plunger bracket  174  and pushing the plunger pin  170  into engagement with the transverse linkage  126 . 
     As depicted in  FIGS. 33-35 , in an example, the lock lever assembly  172  can include a lever  180  rotatably mounted to the lever bracket  178 . The lever  180  can be pulled or pushed to operate the lever bracket  178  and correspondingly the plunger pin  170 . In example, the lever  180  further can include an extended rod  182  for operably connecting the lever  180  to the lever bracket  178 . The extended rod  182  can be sized to position the lever  180  at a convenient position relative to the work surface  102  for access to the lever  180 . 
     As depicted in  FIGS. 36-40 , in an example, the height adjustable desktop system  100  can further include a lock lever assembly  184  that can lock the work surface  102  in the lowered position. The lever  180  can fiirther include a hook arm  186  rotatable between a lock position (shown in  FIG. 38 ) and a release position. The foot portion  132  can also include at least one lock housing  188  corresponding to each hook arm  186 . Each lock housing  188  can define at least one lock notch  190 . In operation, the work surface  102  can be positioned in the lowered position and the lever  180  rotated to position the hook arm  186  in the lock position such that the hook arm  186  engages the lock notch  190 . The engagement of the hook ami  186  to the lock housing  188  maintains the work surface  102  in the lowered position. The lever  180  can be rotated to position the hook arm  186  into the release position in which the hook arm  186  disengages from the hook arm  186  allowing the work surface  102  to be raised into the elevated position. 
     Each of these non-limiting examples can stand on its own, or can be combined in any permutation or combination with any one or more of the other examples. 
     The above detailed description can include references to the accompanying drawings, which form a part of the detailed description. The drawings show, by way of illustration, specific embodiments in which the present subject matter can be practiced. These embodiments are also referred to herein as “examples.” Such examples can include elements in addition to those shown or described. However, the present inventors also contemplate examples in which only those elements shown or described are provided. Moreover, the present inventors also contemplate examples using any combination or permutation of those elements shown or described (or one or more aspects thereof), either with respect to a particular example (or one or more aspects thereof), or with respect to other examples (or one or more aspects thereof) shown or described herein. 
     In the event of inconsistent usages between this document and any documents so incorporated by reference, the usage in this document controls. 
     In this document, the terms “a” or “an” are used, as is common in patent documents, to include one or more than one, independent of any other instances or usages of “at least one” or “one or more.” in this document, the term “or” is used to refer to a nonexclusive or, such that “A or B” can include “A but not B,” “B but not” and “A and B,” unless otherwise indicated. In this document, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Also, in the following claims, the terms “including” and “comprising” are open-ended, that is, a system, device, article, composition, formulation, or process that can include elements in addition to those listed after such a term in a claim are still deemed to fall within the scope of that claim. Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels, and are not intended to impose numerical requirements on their objects. 
     The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments can be used, such as by one of ordinary skill in the art upon reviewing the above description. The Abstract is provided to comply with 37 C.F.R. § 1.72(b), to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Also, in the above Detailed Description, various features may be grouped together to streamline the disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that such embodiments can be combined with each other in various combinations or permutations. The scope of the present subject matter should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.