Patents by Inventor Yeh-Ching Chang

Yeh-Ching Chang 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).

  • Publication number: 20250214208
    Abstract: A screwdriver includes a handle, a fixed stem, a storage assembly and an engaging mechanism. The handle includes a housing defining an inner space. The fixed stem defines an axial direction and is disposed on the housing and protrudes into the inner space. The storage assembly includes a movable stem and at least one storage seat disposed on the movable stem, and the movable stem is movably sleeved with the fixed stem. The engaging mechanism includes at least one first engaging portion disposed on the fixed stem, a second engaging portion disposed on the movable stem and a release assembly. The release assembly is operatable to abut against the second engaging portion so that the second engaging portion is disengaged from said first engaging portion, and the storage assembly is detachable from the fixed stem and removable from the handle.
    Type: Application
    Filed: October 18, 2024
    Publication date: July 3, 2025
    Inventor: YEH-CHING CHANG
  • Publication number: 20240359301
    Abstract: Driver bits comprise a body, a tip disposed at proximal end of the body and configured to engage a faster, a shank disposed at distal end of the body and configured to fit into a power tool, a neck extending between the tip and the shank, and a torsion transfer section with one or more rings at distal end of the tip to absorb and transfer torque to torsion zone of the neck. The shank can also include one or more rings at proximal end of the shank to distribute impact force from the shank to the torsion zone of the neck.
    Type: Application
    Filed: April 30, 2023
    Publication date: October 31, 2024
    Applicant: Makita U.S.A., Inc.
    Inventors: Andrew CAMP, Kenneth HEFLEY, Nathan SANTOS, Yeh Ching CHANG
  • Patent number: 11628546
    Abstract: A tool connecting rod is provided, including: a main body, a sleeve member and a magnetic mechanism. The main body includes a driving portion and an assembling portion opposite to the driving portion, and the assembling portion has an assembling hole extending in an axial direction. The sleeve member is non-rotatably disposed on the assembling portion and includes at least one sleeving hole configured to be connected with a connecting member. The magnetic mechanism is disposed within the assembling hole and includes a magnetic member penetrating into the sleeve member and an elastic member abutted against and between the main body and the magnetic member. In a circumferential direction of the magnetic member, a first gap is defined between the sleeve member and the magnetic member so that the sleeve member and the magnetic member are movable radially relative to each other.
    Type: Grant
    Filed: June 21, 2021
    Date of Patent: April 18, 2023
    Assignee: UNITEK ENTERPRISE CORP.
    Inventor: Yeh-Ching Chang
  • Publication number: 20220402104
    Abstract: A tool connecting rod is provided, including: a main body, a sleeve member and a magnetic mechanism. The main body includes a driving portion and an assembling portion opposite to the driving portion, and the assembling portion has an assembling hole extending in an axial direction. The sleeve member is non-rotatably disposed on the assembling portion and includes at least one sleeving hole configured to be connected with a connecting member. The magnetic mechanism is disposed within the assembling hole and includes a magnetic member penetrating into the sleeve member and an elastic member abutted against and between the main body and the magnetic member. In a circumferential direction of the magnetic member, a first gap is defined between the sleeve member and the magnetic member so that the sleeve member and the magnetic member are movable radially relative to each other.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 22, 2022
    Inventor: YEH-CHING CHANG
  • Patent number: 10434632
    Abstract: A tool connector is provided, including: a shaft, including a connection end configured to be connected to a driving tool; a slidable sleeve, slidably disposed around the shaft; a tubular member, disposed around the shaft, including an inner hole, an insertion opening communicated with the inner hole and a slanted slot communicated with the inner hole, the slanted slot extending inwardly toward the insertion opening; a locking mechanism, including an elastic mechanism and a locking mechanism, the elastic mechanism abutted between the slidable sleeve and the locking mechanism, the elastic mechanism normally urging the locking mechanism in a direction toward the slanted slot, the locking mechanism including a driven portion comovable with the slidable sleeve, and a locking portion received within the slanted slot and radially projectable into the inner hole.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: October 8, 2019
    Inventor: Yeh-Ching Chang
  • Publication number: 20190184529
    Abstract: A tool connector is provided, including: a shaft, including a connection end configured to be connected to a driving tool; a slidable sleeve, slidably disposed around the shaft; a tubular member, disposed around the shaft, including an inner hole, an insertion opening communicated with the inner hole and a slanted slot communicated with the inner hole, the slanted slot extending inwardly toward the insertion opening; a locking mechanism, including an elastic mechanism and a locking mechanism, the elastic mechanism abutted between the slidable sleeve and the locking mechanism, the elastic mechanism normally urging the locking mechanism in a direction toward the slanted slot, the locking mechanism including a driven portion comovable with the slidable sleeve, and a locking portion received within the slanted slot and radially projectable into the inner hole.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 20, 2019
    Inventor: YEH-CHING CHANG
  • Patent number: 8915169
    Abstract: An adjustable driving tool includes a handle and a driving rod. The handle has a limiting portion disposed in the handle and a slot. The limiting portion has an inner space communicating with openings of a first sleeve portion and a second sleeve portion. The slot communicates with the inner space. The handle provided with a pin disposed through the inner space, and the first and second sleeve portions are disposed around the pin. The driving rod has a working end and a fixation end having an elongate through hole around the pin. The fixation end is disposed into the inner space through the slot. The driving rod is slidable relative to the pin, and the fixation end is controllably selectively inserted into the first sleeve portion or the second sleeve portion so that the driving rod is held.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: December 23, 2014
    Inventor: Yeh-Ching Chang
  • Publication number: 20140298960
    Abstract: An adjustable driving tool includes a handle and a driving rod. The handle has a limiting portion disposed in the handle and a slot. The limiting portion has an inner space communicating with openings of a first sleeve portion and a second sleeve portion. The slot communicates with the inner space. The handle provided with a pin disposed through the inner space, and the first and second sleeve portions are disposed around the pin. The driving rod has a working end and a fixation end having an elongate through hole around the pin. The fixation end is disposed into the inner space through the slot. The driving rod is slidable relative to the pin, and the fixation end is .controllably selectively inserted into the first sleeve portion or the second sleeve portion so that the driving rod is held.
    Type: Application
    Filed: November 21, 2013
    Publication date: October 9, 2014
    Inventor: Yeh-Ching CHANG
  • Patent number: 8770071
    Abstract: An electronic torque wrench a wrench head unit adapted to engage and turn a fastener, a tubular first wrench body securely engaged with the wrench head unit, a tubular second wrench body coupled and aligned with the first wrench body by a fitting member to permit rotation of the second wrench body relative to the first wrench body, a mounting shell sleeved on the second wrench body for mounting a display unit to provide a display representing a measured torque. By rotation of the second wrench body, the display unit can be adjusted to a desired angular position for being viewed easily by the user.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: July 8, 2014
    Inventors: Yeh-Ching Chang, Hsien-Cheng Lin
  • Publication number: 20120255405
    Abstract: An electronic torque wrench a wrench head unit adapted to engage and turn a fastener, a tubular first wrench body securely engaged with the wrench head unit, a tubular second wrench body coupled and aligned with the first wrench body by a fitting member to permit rotation of the second wrench body relative to the first wrench body, a mounting shell sleeved on the second wrench body for mounting a display unit to provide a display representing a measured torque. By rotation of the second wrench body, the display unit can be adjusted to a desired angular position for being viewed easily by the user.
    Type: Application
    Filed: April 8, 2011
    Publication date: October 11, 2012
    Inventors: Yeh-Ching CHANG, Hsien-Cheng LIN
  • Publication number: 20120255404
    Abstract: An electronic torque wrench includes a wrench head unit adapted to engage and turn a fastener, a tubular wrench body which includes a front tubular end fittingly engaged and secured with the wrench head unit, and an intermediate tubular segment having an access opening, a grip handle which is configured to securely grip a rear tubular end of the tubular wrench body, a mounting shell which is sleeved on the intermediate tubular segment, and which has an access hole communicated with the access opening, a housing sleeve sleeved on, and rotatable relative to the mounting shell about a lengthwise axis, and a display unit disposed on the housing sleeve to provide a display representing a torque measured by a strain gauge on the wrench head unit. By rotating the housing sleeve, the display unit can be adjusted to a desired angular position for being viewed easily by the user.
    Type: Application
    Filed: April 8, 2011
    Publication date: October 11, 2012
    Inventors: Yeh-Ching CHANG, Hsien-Cheng Lin
  • Patent number: 6612435
    Abstract: A tool case has multiple side plates, a bottom plate, an upper cover and multiple side covers. The side plates are connected with each other to define a containing space for storing large tools. Multiple recesses are defined in the outer side of each respective side plate for receiving tools. Each side cover is pivotally connected to one of the side plates and has an inner side with multiple recesses to receive tools. Accordingly, the space for storing tools in the tool case is large and many, and the use of the tool case is versatile.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: September 2, 2003
    Inventor: Yeh-Ching Chang