Patents Assigned to SPEEDTECH CO., LTD.
  • Crank variable-speed gear device for increasing rotational power
    Patent number: 12195135
    Abstract: Disclosed is a crank variable-speed gear device (100) wherein the gear ratio can be increased to 1.6:1 to 1.8:1 through a gear assembly and a latch assembly, and the gear ratio can also be changed to 1:1, if necessary, thereby providing an excellent transmission efficiency, facilitating the manipulation thereof, and making it possible to provide a compact and lightweight bicycle.
    Type: Grant
    Filed: November 8, 2019
    Date of Patent: January 14, 2025
    Assignees: SPEEDTECH CO., LTD.
    Inventors: Jang Young Han, Dal Won Seo
  • CRANK VARIABLE-SPEED GEAR DEVICE FOR INCREASING ROTATIONAL POWER
    Publication number: 20220024540
    Abstract: Disclosed is a crank variable-speed gear device (100) wherein the gear ratio can be increased to 1.6:1 to 1.8:1 through a gear assembly and a latch assembly, and the gear ratio can also be changed to 1:1, if necessary, thereby providing an excellent transmission efficiency, facilitating the manipulation thereof, and making it possible to provide a compact and lightweight bicycle.
    Type: Application
    Filed: November 8, 2019
    Publication date: January 27, 2022
    Applicants: SPEEDTECH CO., LTD.
    Inventors: Jang Young HAN, Dal Won SEO