Patent ID: 8230759
Filing Date: 2012-07-31
Classification: E05D,E05F,E05Y,E06B

Abstract:
1. An integrated brake and chain disk assembly for a door operator, said door operator comprising a housing having a space therein, an electric motor mounted in a left side of the space of said housing with the right end of a main shaft of the electric motor operatively coupled to a gear box to roll a rolling door, wherein said integrated brake and chain disk assembly comprises: an intermediate shaft disposed within said housing of said door operator, said intermediate shaft having a left end connected to the right end of said main shaft of said electric motor, and a right end coupled to said gear box; an end disk fixedly mounted to the right side of said intermediate shaft; a clutch device having a sleeve disposed on said intermediate shaft; a driven disk being disposed on the right end portion of said sleeve to face said end disk; wherein said sleeve is controlled by actuation means to move between a first position in which said driven disk is retracted away from said end disk when said clutch device is energized, and a second position in which said driven disk is actuated to engage said end disk when said clutch device is not energized; a chain disk device having a chain disk disposed at the left end of said sleeve, said chain disk including a receiving portion at the center and a chain surrounding an outer periphery thereof; a manual switch unit having a central disk and an outer ring portion, wherein the right end of said central disk is fixedly connected to the left end of said sleeve and received within said receiving portion of said chain disk, a block plate projects axially outward from said central disk, said outer ring portion and said chain disk are attached to each other and pivotally mounted on an outer periphery of said central disk, and said outer ring portion has a push plate projecting axially outward therefrom to form a pair of intervals with said block plate axially; a brake device comprising a first hub and at least one torsion spring, in which the left end of said first hub is fixed to said housing, and the right end thereof projects to locate at the interior of said block plate and said push plate, said at least one torsion spring has an internal diameter and is constricted on an outer periphery of said first hub, and has two free ends, each forming into a loop accommodated in said respective interval; whereby when either end of said torsion spring is subject to a force applied by said block plate in the twisting direction of said torsion spring, the internal diameter of said torsion spring is reduced further so that said torsion spring tightly fits on said first hub and becomes immovable, thereby inducing a braking effect on said intermediate shaft; and when either end of said torsion spring is subject to a force applied by said manual switch unit in the direction opposite to the twisting direction of said torsion spring, the internal diameter of said torsion spring is restored so that said torsion spring is loosened from said first hub, thereby releasing the braking of said intermediate shaft such that said intermediate shaft is manually rotatable.