Patents by Inventor Chang I. Heo

Chang I. Heo 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).

  • System for automatically opening and closing doors of vehicles
    Patent number: 5228239
    Abstract: A system for automatically opening and closing a door of a vehicle is disclosed. The system comprises an oil-hydraulic pump for generating hydraulic power for the system and a pressure accumulator for removing pressure pulsations generated in the pressurized oil outputted from the oil-hydraulic pump. A pressure control valve controls a flow direction of the pressurized oil applied from the oil-hydraulic pump thereto, and a controller controls the pressure control valve in response to input signals. An intermittent gearing assembly transmits rotational motion caused by the pressurized oil acting thereon to the door to automatically open or close the door. A hydraulic rotator converts the hydraulic power of the pressurized oil into rotational motion of the intermittent gearing assembly. A longitudinal lock bar movable in response to intermittent gearing motion locks and unlocks the door relative to the vehicle frame.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: July 20, 1993
    Assignee: Asia Motors Co., Inc.
    Inventor: Chang I. Heo