Patents by Inventor Frank F. Hoffman

Frank F. Hoffman 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).

  • Replaceable plastic trolley wheel and method
    Patent number: 5156533
    Abstract: A trolley wheel assembly (10,100) includes a wheel member (18,118) and a support pin (12) defining an axis of rotation. A mounting sleeve 922,122) is fixedly secured about the support pin (12). Bearing sleeve halves (30,32,130,132) are disposed about the mounting sleeve (22,122) for allowing rotation of the wheel member (18,118) about the axis of rotation. Further, a method of replacing a worn trolley wheel includes the steps of removing the worn trolley wheel from the support pin (12), mounting a bearing sleeve 926,126) over a mounting sleeve (22,122) for allowing rotation of the wheel member 918,118) relative to the axis of rotation when the mounting sleeve (22) is mounted on the support pin (12), and mounting an unworn wheel member (18) about the bearing sleeve (26) for rotation relative thereto, and fixedly securing the mounting sleeve (22) about the support pin (12).
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: October 20, 1992
    Inventors: Frank F. Hoffman, Arnold R. Hoffman