US 9,808,079 B2
Height adjustable desk system and method
Mustafa A. Ergun, Eden Prairie, MN (US); Robert William Fluhrer, Prior Lake, MN (US); Scott Trish, Lakeville, MN (US); and Jeffrey Randall Mensing, Blaine, MN (US)
Assigned to Ergotron, Inc., St. Paul, MN (US)
Filed by Ergotron, Inc., St. Paul, MN (US)
Filed on Feb. 22, 2017, as Appl. No. 15/439,366.
Application 15/439,366 is a continuation of application No. 15/265,399, filed on Sep. 14, 2016, granted, now 9,591,919.
Application 15/265,399 is a continuation of application No. 14/883,010, filed on Oct. 14, 2015, granted, now 9,510,671.
Application 14/883,010 is a continuation of application No. 14/461,932, filed on Aug. 18, 2014, granted, now 9,232,855.
Claims priority of provisional application 61/867,308, filed on Aug. 19, 2013.
Prior Publication US 2017/0156488 A1, Jun. 8, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. A47B 9/00 (2006.01); A47B 9/02 (2006.01); A47B 21/02 (2006.01); A47B 9/20 (2006.01); A47B 9/12 (2006.01); A47B 9/10 (2006.01)
CPC A47B 9/02 (2013.01) [A47B 9/10 (2013.01); A47B 9/12 (2013.01); A47B 9/20 (2013.01); A47B 21/02 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A height adjustable desk comprising:
a work surface;
a first leg assembly attached to the work surface;
a second leg assembly attached to the work surface;
each of the first and second leg assemblies including a lift mechanism, the lift mechanism including:
a first member;
a second member moveable relative to the first member along a longitudinal axis;
a third member moveable relative to the second member along the longitudinal axis;
a synchronization assembly coupled to at least one of the first and second leg assemblies, wherein the synchronization assembly is configured to balance movement between the first and second members with movement between the second and third members; and
a counterbalance mechanism assembly configured to counteract a force exerted on the first and second leg assemblies and attached to a bottom surface of the work surface, wherein the counterbalance mechanism assembly further comprises:
a bracket coupled to the bottom surface of the work surface;
a cam/wheel assembly rotatably coupled to the bracket, the cam/wheel assembly rotating about a vertical axis, the cam/wheel assembly including an upper wheel, a lower wheel, and a cam assembly;
an energy storage member coupled to the bottom surface of the work surface;
a first tension member coupled to the upper wheel and the first leg assembly;
a second tension member coupled to the lower wheel and the second leg assembly; and
a third tension member coupled to the cam assembly and the energy storage member.