Patents by Inventor Chuan Tsai Chen

Chuan Tsai Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Structure of the main shaft of an umbrella
    Patent number: 6330887
    Abstract: An improved structure of the main shaft of a large size umbrella comprising an umbrella structure and an eccentric engaging element, characterized in that the umbrella structure includes an umbrella body, the main shaft an inner shaft and the eccentric engaging element includes an eccentric rotating gear cover and an eccentric shaft, and the eccentric rotating shaft is mounted within an eccentric slot of the eccentric shaft and is disposed at an eccentric post, which provides restriction and rotatably mounting function, a tolerance slot is provided at the eccentric rotating gear cover, and the edge of the eccentric rotating gear slot is threaded and the bottom section thereof is provided with an arch-shaped notch, which is corresponding to a protruded blocking section located at the bottom edge of the eccentric shaft, and the eccentric engaging element is mounted at the head end of the inner shaft and the inner shaft is located within the hollow body of the main shaft, a rolling slot is provided at the lower
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: December 18, 2001
    Inventor: Chuan Tsai Chen