Patents by Inventor Gary L. Werkhoven

Gary L. Werkhoven 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).

  • Rotary actuator with internal brake mechanism
    Patent number: 7930971
    Abstract: A vane type hydraulic rotary actuator incorporates a fail-safe brake for preventing movement of the device's rotor relative to a housing in which the rotor is journaled. The brake has a spring-biased piston that is forced to a locked condition whenever applied hydraulic operating pressure acting on the vane falls below a predefined limit. The rotary actuator also incorporates an improved sealing arrangement that prevents egress of hydraulic fluid from a high pressure chamber on one side of the vane to a low pressure chamber on the opposite side of the vane.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: April 26, 2011
    Inventor: Gary L. Werkhoven
  • Rotary Actuator With Internal Brake Mechanism
    Publication number: 20100064885
    Abstract: A vane type hydraulic rotary actuator incorporates a fail-safe brake for preventing movement of the device's rotor relative to a housing in which the rotor is journaled. The brake has a spring-biased piston that is forced to a locked condition whenever applied hydraulic operating pressure acting on the vane falls below a predefined limit. The rotary actuator also incorporates an improved sealing arrangement that prevents egress of hydraulic fluid from a high pressure chamber on one side of the vane to a low pressure chamber on the opposite side of the vane.
    Type: Application
    Filed: September 15, 2008
    Publication date: March 18, 2010
    Inventor: Gary L. Werkhoven