Patents by Inventor Ming-Da Li

Ming-Da Li 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).

  • Bypass-type motor protecting device for a vacuum cleaner
    Patent number: 8347458
    Abstract: A bypass-type motor protecting device includes: a casing fitted into a bypass opening in a body housing of a vacuum cleaner and having an inner abutment wall; a seat body having a bypass entry port; a valve body unit movable within the casing relative to the bypass entry port and including a valve disc to be engaged with and disengaged from the seat body, a plunger body having an externally accessible operated head and an axially extending threaded shank, and an abutment member threadedly engaged with the shank such that rotation of the operated head results in a change of an axial distance between the abutment member and the inner abutment wall; and a biasing member disposed to bias the abutment member and the inner abutment wall such that a biasing force thereof is varied in strength by the change of the axial distance.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: January 8, 2013
    Assignee: Zeng Hsing Industrial Co., Ltd.
    Inventors: Shui-Chun Tseng, Chin-Chao Chung, Ming-Da Li
  • Bypass-Type Motor Protecting Device for a Vacuum Cleaner
    Publication number: 20110033289
    Abstract: A bypass-type motor protecting device includes: a casing fitted into a bypass opening in a body housing of a vacuum cleaner and having an inner abutment wall; a seat body having a bypass entry port; a valve body unit movable within the casing relative to the bypass entry port and including a valve disc to be engaged with and disengaged from the seat body, a plunger body having an externally accessible operated head and an axially extending threaded shank, and an abutment member threadedly engaged with the shank such that rotation of the operated head results in a change of an axial distance between the abutment member and the inner abutment wall; and a biasing member disposed to bias the abutment member and the inner abutment wall such that a biasing force thereof is varied in strength by the change of the axial distance.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 10, 2011
    Applicant: ZENG HSING INDUSTRIAL CO., LTD.
    Inventors: Shui-Chun Tseng, Chin-Chao Chung, Ming-Da Li