Patents by Inventor Daniel E. Tyrrell

Daniel E. Tyrrell 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).

  • Protected tool bushing for an impact hammer
    Patent number: 6510904
    Abstract: An improved bushing for a heavy duty hydraulic hammer provides increased bushing life and provides cooler operation for the hammer. A Polymeric bushing is positioned near the lower end of the tool holder of a hammer surrounding the tool. The polymeric bushing is protected by a steel ring below the polymeric bushing preventing foreign objects from impacting upon the polymeric bushing.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: January 28, 2003
    Assignee: Nippon Pneumatic Mfg. Co., Ltd.
    Inventor: Daniel E. Tyrrell
  • Mounting for a construction shear
    Patent number: 6047475
    Abstract: A demolition shear is attachable to a mobile machine by one of two brackets. The brackets engage, alternatively, two of three pairs of mounting holes on the shear so the shear can be mounted at its proximal end to the stick or at its side to the boom of the machine.
    Type: Grant
    Filed: February 26, 1998
    Date of Patent: April 11, 2000
    Assignee: Nippon Pneumatic Mfg. Co. Ltd.
    Inventors: Daniel E. Tyrrell, John Andrew Higgins
  • Meter for comparing impact hammers
    Patent number: 5410905
    Abstract: An apparatus and method of measuring and comparing actual and relative impact forces of an impact machine to determine the operating parameters of the machine wherein the apparatus includes a vessel containing a fluid, a vessel piston which moves into the vessel in a substantially frictionless manner upon impact by the impact machine to create a force on the fluid in the vessel and a measuring system to measure the forces applied to the apparatus.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: May 2, 1995
    Inventors: Ron R. Karani, Daniel E. Tyrrell