Patents by Inventor John J. Grisaffi

John J. Grisaffi 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).

  • Cable sling arrangement for pivoting a drilling mast and drawworks elevator to a raised or reclined position in relation to a substructure support and method of cable sling string up
    Patent number: 4478015
    Abstract: A drilling mast and drawworks elevator are pivotally secured to a substructure support with a frame secured to the support and extending upwardly between the drilling mast and elevator support. A cable on a rotatable drum on the drawworks elevator extends from a traveling block in the drilling mast, around the drilling mast crown block, to a drum on the drawworks elevator, and a hook is suspended by the traveling block in the drilling mast. Sheaves are mounted adjacent the upper end of the frame. Mast raising sheaves are mounted in the drilling mast as are deflection sheaves, and a slingline equalizer is connected with the hook means, with sheaves positioned thereon.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: October 23, 1984
    Inventors: Larry K. Lawrence, John J. Grisaffi