Patents by Inventor Ernst F. Lehners

Ernst F. Lehners 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).

  • Personnel safety device for an underground duct particularly a sewer pipe
    Patent number: 4721182
    Abstract: The safety device for a person in an underground duct, tunnel or the like, particularly for a person in a sewer pipe, comprises a guide rail attached by a plurality of spaced fasteners to the roof of the duct or tunnel and a traveling body movable on and along the guide rail which is attached with a safety tether to a safety belt worn by the person. The traveling body is a hingedly or pivotally openable and closable end piece device located at or near one end of a safety rod which is provided with a retaining eye for the safety tether and with an end piece handle at its other end.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: January 26, 1988
    Assignee: Fahrleitungsbau Gesellschaft mit beschrankter Haftung
    Inventors: Arnfried Brinkmann, Udo Heuser, Ernst F. Lehners