公开(公告)号：US20230272650A1

公开(公告)日：2023-08-31

申请号：US17681165

申请日：2022-02-25

Applicant: Zhide FENG

Inventor： Zhide FENG

IPC: E05D13/00

CPC classification number: E05D13/1215 ,  E05Y2201/484 ,  E05Y2201/654 ,  E05Y2201/664 ,  E05Y2900/106 ,  E05Y2900/518

Abstract: A counterbalance system for balancing an overhead door installed against a structure of a vehicle or a house, the door having at least one door panel, the system has a longitude pipe with non-circular section cut; a pair of U-brackets having two side walls with one center hole on each side; a pair of torsion spring assemblies received within the pipe, and the inboard end of the assembly being slidingly engaged within the pipe; a pair of connecting shaft, with inboard side connected with the outboard end of each of the spring assemblies; the shaft passing through the center holes of the U-bracket; the outboard end of each shaft being fixed with the side wall on the outboard end of each of the U-brackets; a pair of drums each having a center hole received by the shaft, and each of the drums located between two side walls of the U-bracket.