Patents Assigned to Haverfield Corporation
  • Helicopter lineman's ladder
    Patent number: 6994186
    Abstract: A rigid, unitary ladder is provided having one end configured to be attached to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends at an angle at least equal to ninety degrees from an end of the first section to a base which is configured to rest on the powerline, the angle being defined between the undersides of the first and second ladder sections. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.
    Type: Grant
    Filed: June 15, 2004
    Date of Patent: February 7, 2006
    Assignee: Haverfield Corporation
    Inventor: Darryl K. Ed
  • Helicopter lineman's ladder
    Publication number: 20040222041
    Abstract: A rigid, unitary ladder is provided having one end configured to be attached to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends at an angle at least equal to ninety degrees from an end of the first section to a base which is configured to rest on the powerline, the angle being defined between the undersides of the first and second ladder sections. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.
    Type: Application
    Filed: June 15, 2004
    Publication date: November 11, 2004
    Applicant: Haverfield Corporation
    Inventor: Darryl K. Ed
  • Helicopter lineman's ladder and method for energized powerline repair
    Patent number: 6769514
    Abstract: A rigid, unitary ladder is provided having one end which attaches to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends angularly downward from the first section to a base which rests on the powerline. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: August 3, 2004
    Assignee: Haverfield Corporation
    Inventor: Darryl K. Ed
  • Helicopter lineman's ladder and method for energized powerline repair
    Patent number: 6675935
    Abstract: A rigid, unitary ladder is provided having one end which attaches to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends angularly downward from the first section to a base which rests on the powerline. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: January 13, 2004
    Assignee: Haverfield Corporation
    Inventor: Darryl K. Ed