Patents by Inventor Robert Z. Gartrell, III

Robert Z. Gartrell, III 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).

  • Safety brake device for theatre hoist
    Patent number: 9162791
    Abstract: A safety brake device for a theatre hoist to prevent the uncontrolled release of a load that is suspended above or below people includes an overrunning clutch and a torque disc. The torque disc only rotates with the overrunning clutch when the load is lowered, but must overcome friction forces applied to the surface of the torque disc to do so. The friction forces are constantly applied to the torque disc by maintaining friction material in contact with the torque disc. The friction material is a non-asbestos, non-metallic composite saturated with a lubricant.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: October 20, 2015
    Assignee: The Rowland Company
    Inventor: Robert Z. Gartrell, III
  • Safety brake device for theatre hoist
    Patent number: 8448922
    Abstract: A safety brake device for a theatre hoist to prevent the uncontrolled release of a load that is suspended above or below people includes an overrunning clutch and a torque disc. The torque disc only rotates with the overrunning clutch when the load is lowered, but must overcome friction forces applied to the surface of the torque disc to do so. The friction forces are constantly applied to the torque disc by maintaining friction material in contact with the torque disc. The friction material is a non-asbestos, non-metallic composite saturated with a lubricant.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: May 28, 2013
    Assignee: The Rowland Company
    Inventor: Robert Z. Gartrell, III
  • SAFETY BRAKE DEVICE FOR THEATRE HOIST
    Publication number: 20110073820
    Abstract: A safety brake device for a theatre hoist to prevent the uncontrolled release of a load that is suspended above or below people includes an overrunning clutch and a torque disc. The torque disc only rotates with the overrunning clutch when the load is lowered, but must overcome friction forces applied to the surface of the torque disc to do so. The friction forces are constantly applied to the torque disc by maintaining friction material in contact with the torque disc. The friction material is a non-asbestos, non-metallic composite saturated with a lubricant.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 31, 2011
    Inventor: Robert Z. Gartrell, III