Patents by Inventor Yuan-Chin Chi

Yuan-Chin Chi 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).

  • Patent number: 8616095
    Abstract: A hand tool includes a head in which a driving member is received and a pawl is engaged with the driving member. A handle has a substantially round driving end which is rotatably received in a pivoting recess in the head and a pushing member protrudes from the driving end and is engaged with the pawl. The handle includes two contact sides which alternatively contact two outward tapered sidewalls of a driving recess in the driving end when operating the handle. The pawl is shifted to contact the driving member by the teeth at different positions of the pawl when operating the handle to change the driving direction of the driving member. No switching member is connected to the pawl and protrudes from the top surface of the head of the hand tool.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: December 31, 2013
    Inventor: Yuan-Chin Chi
  • Patent number: 8156846
    Abstract: An extension rod includes a body having an axial passage and a restriction hole and a positioning hole are respectively defined radially in the body and communicate with the axial passage. A shaft of a control member is rotatably inserted into the positioning hole and includes a recess defined in radially which is located within the axial passage. An operation rod is axially movably inserted into the axial passage and a spring is biased between the operation rod and an end piece which seals the axial passage. The operation rod is engaged with the recess and includes first and second dents in different depths. When rotating the shaft, the first and second dents are movable to receive a bead in the restriction hole such that the bead is control to protrude out from the restriction hole to position or release a socket mounted to the body.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: April 17, 2012
    Inventor: Yuan-Chin Chi
  • Publication number: 20110100168
    Abstract: An extension rod includes a body having an axial passage and a restriction hole and a positioning hole are respectively defined radially in the body and communicate with the axial passage. A shaft of a control member is rotatably inserted into the positioning hole and includes a recess defined in radially which is located within the axial passage. An operation rod is axially movably inserted into the axial passage and a spring is biased between the operation rod and an end piece which seals the axial passage. The operation rod is engaged with the recess and includes first and second dents in different depths. When rotating the shaft, the first and second dents are movable to receive a bead in the restriction hole such that the bead is control to protrude out from the restriction hole to position or release a socket mounted to the body.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 5, 2011
    Inventor: YUAN-CHIN CHI
  • Publication number: 20100251860
    Abstract: A hand tool includes a head in which a driving member is received and a pawl is engaged with the driving member. A handle has a substantially round driving end which is rotatably received in a pivoting recess in the head and a pushing member protrudes from the driving end and is engaged with the pawl. The handle includes two contact sides which alternatively contact two outward tapered sidewalls of a driving recess in the driving end when operating the handle. The pawl is shifted to contact the driving member by the teeth at different positions of the pawl when operating the handle to change the driving direction of the driving member. No switching member is connected to the pawl and protrudes from the top surface of the head of the hand tool.
    Type: Application
    Filed: October 30, 2009
    Publication date: October 7, 2010
    Inventor: YUAN-CHIN CHI