Patents by Inventor David M. Tetzlaff

David M. Tetzlaff 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).

  • Double-acting suspension axle assembly for heavy load transporters
    Patent number: 8991832
    Abstract: The present disclosure relates to double acting suspension axle assemblies that can be used to facilitate mobility of a heavy load transporter and/or to adjust a deck height of the heavy load transporter. Each axle assembly includes a wheel assembly and a double-acting hydraulic cylinder. The double acting suspension axle provides the ability to force the hydraulic cylinder of each axle assembly to fully retract without relying solely on gravity. The double acting suspension axle assembly may be incorporated directly into or permanently affixed to other large structures, such as mobile robots, large tooling structures, gantry cranes, or other large machinery to provide the precise control of mobility and forced lowering capabilities.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: March 31, 2015
    Assignees: Doefer Companies, Clover Industries Inc.
    Inventors: David M. Tetzlaff, John R. Burnett, Jason Van Clark, Melvin D. Terry
  • DOUBLE-ACTING SUSPENSION AXLE ASSEMBLY FOR HEAVY LOAD TRANSPORTERS
    Publication number: 20130302122
    Abstract: The present disclosure relates to double acting suspension axle assemblies that can be used to facilitate mobility of a heavy load transporter and/or to adjust a deck height of the heavy load transporter. Each axle assembly includes a wheel assembly and a double-acting hydraulic cylinder. The double acting suspension axle provides the ability to force the hydraulic cylinder of each axle assembly to fully retract without relying solely on gravity. The double acting suspension axle assembly may be incorporated directly into or permanently affixed to other large structures, such as mobile robots, large tooling structures, gantry cranes, or other large machinery to provide the precise control of mobility and forced lowering capabilities.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 14, 2013
    Applicant: DOERFER COMPANIES
    Inventors: David M. Tetzlaff, John R. Burnett, Jason Van Clark, Melvin D. Terry