Patents by Inventor Robert B. Toenjes

Robert B. Toenjes 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).

  • Obstruction sensor for electro-mechanically operated garage doors
    Patent number: 4274227
    Abstract: An obstruction sensor for an electro-mechanically operated garage door which utilizes a bracket for supporting one end of the trolley that carries the door and which is driven by the motor either through a chain or worm and wherein an obstruction encountered by the door will cause the rail to move relative to a fixed bracket thus causing a reversing switch to be energized due to relative motion between the fixed bracket and the rail which will cause the motor driving circuit to reverse the motor thus causing the door to move away from the obstruction.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: June 23, 1981
    Assignee: Chamberlain Manufacturing Corporation
    Inventor: Robert B. Toenjes