Patents by Inventor Joseph R. Benjamin

Joseph R. Benjamin 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).

  • Method and apparatus for sinking shafts
    Patent number: 4227583
    Abstract: Disclosed is a method and apparatus for sinking shafts in which ring-like walling elements used as a shaft shoring are inserted into the shaft concurrently with the drilling thereof. The walling elements are held against rotation by a mechanism at the top of the shaft which sequentially inserts the walling elements into the shaft as dictated by the depth thereof as drilling progresses. The lowermost end of the lowermost walling element is supported on a bearing associated with the shaft drill bit.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: October 14, 1980
    Assignee: Wirth Maschinen-und Bohrgerate-Fabrik
    Inventor: Joseph R. Benjamin