Patent ID: 9003710
Filing Date: 2015-04-14
Classification: E05D,E05Y,Y10T

Abstract:
1. A window balance system, comprising: a housing member comprising a recess defining an arcuate housing region having a first end and a second end; and a curl spring configured to be positioned within the housing member and to contact at least a portion of the arcuate housing region; wherein the arcuate housing region comprises a contact location intermediate the first end and the second end of the arcuate housing region and protruding into the recess; wherein the contact location comprises a first non-rotatably fixed arcuate faced protuberance including a face and having a first edge and a second edge and a second non-rotatably fixed arcuate faced protuberance including a face and having a third edge and a fourth edge; and wherein the curl spring contacts the contact location as the curl spring is drawn out of the housing member.