Patents by Inventor Changhai Dai

Changhai Dai 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: 10703129
    Abstract: An electric pencil sharpener includes a power device. The power device is connected to two rotatable rubber wheels by a transmission mechanism. The two rubber wheels are located on two sides of the pencil to be sharpened, are rotated in opposite directions and closely fit a side wall of the pencil to be sharpened, to push upwards or downwards the pencil to be sharpened to move. A gap between the two rubber wheels is adjustable. The electric pencil sharpener further includes a rotatable cutter carrier assembly located below the rubber wheels configured to sharpen the pencil to be sharpened. The electric pencil sharpener can sharpen the pencil of different diameters, and has a sharpening process requiring no human participation, has a wide application and saves manual operation.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: July 7, 2020
    Assignee: NINGBO WEISHU STATIONERY CO., LTD
    Inventors: Changhai Dai, Zhongmin Duan
  • Patent number: 10556363
    Abstract: An electric stapler includes a base and a press portion articulated to the base. The press portion is provided with, from down to up, a staple channel assembly configured to receive a staple, a staple pressing plate assembly configured to press the staple and a drive assembly in sequence. The position of the drive assembly is fixed relative to the press portion. The staple channel assembly and the staple pressing plate assembly are rotatable relative to the press portion. The drive assembly includes a power unit and an execution component connected to the power unit to press or raise the staple pressing plate assembly. The above electric stapler addresses the technical issues that the staple channel cannot reset automatically after the staple is stuck and it is difficult to clear away a failed staple.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: February 11, 2020
    Assignee: NINGBO WEISHU STATIONERY CO., LTD
    Inventors: Zhongmin Duan, Changhai Dai
  • Publication number: 20180319036
    Abstract: An electric stapler includes a base and a press portion articulated to the base. The press portion is provided with, from down to up, a staple channel assembly configured to receive a staple, a staple pressing plate assembly configured to press the staple and a drive assembly in sequence. The position of the drive assembly is fixed relative to the press portion. The staple channel assembly and the staple pressing plate assembly are rotatable relative to the press portion. The drive assembly includes a power unit and an execution component connected to the power unit to press or raise the staple pressing plate assembly. The above electric stapler addresses the technical issues that the staple channel cannot reset automatically after the staple is stuck and it is difficult to clear away a failed staple.
    Type: Application
    Filed: August 14, 2017
    Publication date: November 8, 2018
    Applicant: NINGBO WEISHU STATIONERY CO., LTD
    Inventors: Zhongmin DUAN, Changhai DAI
  • Publication number: 20180319203
    Abstract: An electric pencil sharpener includes a power device. The power device is connected to two rotatable rubber wheels by a transmission mechanism. The two rubber wheels are located on two sides of the pencil to be sharpened, are rotated in opposite directions and closely fit a side wall of the pencil to be sharpened, to push upwards or downwards the pencil to be sharpened to move. A gap between the two rubber wheels is adjustable. The electric pencil sharpener further includes a rotatable cutter carrier assembly located below the rubber wheels configured to sharpen the pencil to be sharpened. The electric pencil sharpener can sharpen the pencil of different diameters, and has a sharpening process requiring no human participation, has a wide application and saves manual operation.
    Type: Application
    Filed: August 18, 2017
    Publication date: November 8, 2018
    Applicant: NINGBO WEISHU STATIONERY CO., LTD
    Inventors: Changhai DAI, Zhongmin DUAN
  • Patent number: 9669651
    Abstract: A fully-automatic pencil sharpener is provided according to embodiments of the present application, which may avoid the problem of the pencil being overly sharpened in the conventional electric pencil sharpener, and realize a maximized utilization of the length of the pencil, thus is more economical and environmental friendly compared to the conventional electric pencil sharpener. The fully-automatic pencil sharpener according to embodiments of the present application includes a pencil-pushing module, a pencil-sharpening module, a power module, a detection module, a control module and a housing. The pencil-pushing module is adapted to push a pencil to a preset position, for example pushing the pencil to the pencil-sharpening module when the pencil is placed in the pencil sharpener, and pushing the pencil out of the fully-automatic pencil sharpener when the pencil has been sharpened.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: June 6, 2017
    Assignee: GuangZhou PanYu Tung Yung Stationery MFY., LTD.
    Inventors: Liangchun Zhong, Zhongmin Duan, Changhai Dai
  • Publication number: 20150000791
    Abstract: A fully-automatic pencil sharpener is provided according to embodiments of the present application, which may avoid the problem of the pencil being overly sharpened in the conventional electric pencil sharpener, and realize a maximized utilization of the length of the pencil, thus is more economical and environmental friendly compared to the conventional electric pencil sharpener. The fully-automatic pencil sharpener according to embodiments of the present application includes a pencil-pushing module, a pencil-sharpening module, a power module, a detection module, a control module and a housing. The pencil-pushing module is adapted to push a pencil to a preset position, for example pushing the pencil to the pencil-sharpening module when the pencil is placed in the pencil sharpener, and pushing the pencil out of the fully-automatic pencil sharpener when the pencil has been sharpened.
    Type: Application
    Filed: December 4, 2013
    Publication date: January 1, 2015
    Applicant: GuangZhou PanYu Tung Yung Stationery MFY., LTD.
    Inventors: Liangchun ZHONG, Zhongmin Duan, Changhai Dai
  • Publication number: 20140284369
    Abstract: An embodiment of the present application provides a staple-ejecting type stapler, which can use an energy storing and energy releasing assembly to store energy by means of the lever principle and to generate an elastic force by releasing the elastic potential energy. Under the action of the elastic force, a staple driver pushes a staple to pierce through paper, and legs of the staple are bent by an anvil plate, thereby realizing the binding function in a convenient and labor-saving manner.
    Type: Application
    Filed: December 2, 2013
    Publication date: September 25, 2014
    Applicant: GuangZhou PanYu Tung Yung Stationery MFY., LTD.
    Inventors: Xiaorong Yang, Zhongmin Duan, Changhai Dai