Patent ID: 6698558
Filing Date: 2004-03-02
Classification: E05D,E05F,E05Y,E06B,F16F

Abstract:
A brake system for garage doors, comprising:A) a sealed longitudinal housing assembly containing a fluid; B) a piston assembly slidably and snugly movable within said housing assembly and including first and second ends and a central through opening longitudinally extending between said first and second ends and a threaded bushing rigidly mounted to said piston assembly coaxially within said through opening, said piston assembly further including at least one connecting aperture extending longitudinally between said first and second ends; C) guiding means for preventing the rotation of said piston assembly; D) a threaded axle having a portion external of said housing assembly and a threaded portion cooperatively meshed with said threaded bushing so that the rotation of said threaded axle causes said piston assembly to move longitudinally within said housing assembly and said threaded axle being connected to a counterbalance axle of an opening and closing mechanism for garage doors thereby transmitting the rotational movement of said counterbalance axle to said threaded axle; and E) a flapper valve assembly mounted to said first end through separating spring means and further including means for sealing said at least one connecting aperture when the force exerted by said separating spring means is overcome by the transmission of a rotational movement that exceeds a predetermined magnitude that causes said flapper valve assembly to be exposed to the force exerted by said fluid on the path of said flapper valve assembly.