Patent ID: 7461683
Filing Date: 2008-12-09
Classification: E06B

Abstract:
1. An improved curtain rolling buffer apparatus, comprising a casing, a bushing, a hub, a cap and a rotor, wherein: the casing has a strut extending outwards from one end thereof having a cavity formed in the center therein, and an annular indented recess and a hollow interior formed on another end, the hollow interior having a bottom side with a stub shaft located thereon; the bushing has a round aperture formed on one end in the center thereof to couple with the stub shaft of the casing, and an annular jutting ring extending outwards from an end surface of another end thereof; the hub has a hub body on one end that has a trough formed on the periphery, and a rod on another end thereof with an elongated chamfer section formed thereon; the cap has an annular retaining ring located on one end thereof to encase and press an oil seal located on the end surface of another end of the bushing to prevent the oil seal from falling out, and a cap rim located on another end to couple with the annular indented recess of the casing; and the rotor has an elongated cavity formed in the center of one end thereof to couple with the elongated chamfer section of the rod of the hub; wherein during extending a curtain with the curtain rolling buffer apparatus, a spring surrounding an axle in the bushing and the hub are coupled and turned clockwise, the spring being extended outwards and running idle, and the spring force being smaller than the corresponding force due to the lube oil pressure in the first space such that the curtain is pulled and extended smoothly; on the contrary, during winding and retracting the curtain by turning counterclockwise, the spring in the bushing being tightened and driving the bushing to rotate together counterclockwise, the bushing being retarded by the lube oil and generating a reaction force in an opposite direction to reduce the winding speed to retract the curtain at a lower speed.