US 12,453,665 B2
Wheelchair suspension
Robert L. Cuson, LaGrange, OH (US); Robert A. Bekoscke, Medina, OH (US); and Daniel J. Stothard, North Olmsted, OH (US)
Filed by Invacare Corporation, Elyria, OH (US)
Filed on Sep. 7, 2023, as Appl. No. 18/462,557.
Application 18/462,557 is a division of application No. 17/394,525, filed on Aug. 5, 2021, granted, now 11,857,470.
Application 17/394,525 is a division of application No. 15/918,730, filed on Mar. 12, 2018, granted, now 11,096,845, issued on Aug. 24, 2021.
Application 14/690,678 is a division of application No. 12/900,548, filed on Oct. 8, 2010, granted, now 9,010,470, issued on Apr. 21, 2015.
Application 15/918,730 is a continuation of application No. 14/690,678, filed on Apr. 20, 2015, granted, now 9,913,768, issued on Mar. 13, 2018.
Claims priority of provisional application 61/250,222, filed on Oct. 9, 2009.
Prior Publication US 2023/0414421 A1, Dec. 28, 2023
Int. Cl. A61G 5/10 (2006.01); A61G 5/04 (2013.01); A61G 5/06 (2006.01)
CPC A61G 5/10 (2013.01) [A61G 5/04 (2013.01); A61G 5/042 (2013.01); A61G 5/043 (2013.01); A61G 5/06 (2013.01); A61G 5/1078 (2016.11); A61G 5/1089 (2016.11); B60G 2300/24 (2013.01); Y10S 180/907 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A wheelchair comprising:
a frame;
a drive assembly fixedly connected to the frame and forward of a vertical midpoint plane of the frame;
a front anti-tip pivot arm pivotally connected to the frame at a first pivot connection;
a rear anti-tip pivot arm pivotally connected to the frame at a second pivot connection;
a link pivotally connected to the front and rear anti-tip pivot arms;
a biasing member connected between the frame and at least one of the front and rear anti-tip pivot arms;
wherein the front anti-tip pivot arm comprises an upward mount for pivotally connecting the link to the front anti-tip pivot arm; and
wherein the rear anti-tip pivot arm comprises a forward portion that is forward of the second pivot connection and wherein the forward portion pivotally connects the link to the rear anti-tip pivot arm.