Telescoping tower and method of manufacture

Details Telescoping tower and method of manufacture Telescoping tower and method of manufacture

2005-06-24

2008-10-07

Jones, David B (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S389300, C072S414000

Reexamination Certificate

active

07430890

ABSTRACT:
A mast section for a telescoping tower system is made by aligning press brake tools along the length of the metal sheet at spaced width locations and forming the corners of the tube. After forming of the last corner, an opening remains along the length of the tube. The press brake male tool axis is offset sufficiently to permit the tool to apply forming force to the last corner of the tube through the opening, and is sized to remove the tool from the opening. At least three mast sections are nested to form the tower system. Pulleys for a cable extension system are mounted near the upper and lower ends of a wall of an intermediate mast section, with one of the pulleys being oriented at an acute angle to the mast section wall to permit routing of the cable.

REFERENCES:
patent: 2115441 (1938-04-01), Biack
patent: 3218839 (1965-11-01), Rosanes
patent: 4932176 (1990-06-01), Roberts et al.
patent: 5058269 (1991-10-01), May
patent: 5775162 (1998-07-01), Ward
patent: 5786854 (1998-07-01), Slade et al.
patent: 6601427 (2003-08-01), Kondou et al.
patent: 6751993 (2004-06-01), Sekita et al.

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