Telescopic boom apparatus

A telescopic boom apparatus comprising:

• a elongated outer boom presenting opposed proximal and distal ends and a hollow passageway extending therebetween, the distal end presenting a cross sectional width;
• an extensible inner boom telescopically received within said outer boom for axial telescoping movement in and out of the distal end of said outer boom, said inner boom having opposed proximal and distal ends;
• and
• guiding means for guiding said inner boom for axial telescoping movement in and out of the distal end of said outer boom, said guiding means including:
• a first set of elongated guide rails secured within said outer boom passageway and extending parallel to the longitudinal axis of said outer boom, each of said first set guide rails presenting an arcuate track surface;
• a plurality of roller wheels spaced circumferentially about the proximal end of said inner boom, each of said roller wheels including an arcuate rail engaging surface for engaging said track surfaces of said first set of guide rails during telescoping movement of said inner pole;
• a second set of elongated guide rails secured to said inner boom;
• and
• a pair of roller bars secured to the distal end of said outer boom for engaging said second set of guide rails for guiding said inner boom during axial telescoping movement in and out of the distal end of said outer boom, said roller bars being positioned on opposed sides of the distal end of said outer boom and extending across substantially the entire cross sectional width of the distal end of said outer boom.