Patents by Inventor Cheng Chao-Hsing

Cheng Chao-Hsing 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).

  • Locking apparatus for upper and lower molds of a press
    Patent number: 5879726
    Abstract: A locking apparatus for an upper mold and a lower mold of a press apparatus includes a ball screw, a screw nut, a force producing spanner structure and at least one engagement structure. The screw nut is responsive to a first power source for driving the ball screw in an axial direction to perform a lower-pressure higher-speed stroke. The spanner is responsive to a second power source for producing a force in circumferential direction. The engagement structure is arranged around an external rim of the screw nut. Responsive to the force in the circumferential direction, the engagement structure closely engages with the external rim of the screw nut such that a corresponding friction force is applied to the screw nut. The screw nut, responsive to the friction force, drives the ball screw in the axial direction to perform a higher-pressure stroke to lock the upper mold and lower mold.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: March 9, 1999
    Assignee: Gallant Precision Machining Co., L.T.D.
    Inventor: Cheng Chao Hsing
  • Electrical connector
    Patent number: D446775
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: August 21, 2001
    Inventors: Cheng Chao-Hsing, Wang Yao-Te