Apparatus for retracting and extending a boom

Details Apparatus for retracting and extending a boom Apparatus for retracting and extending a boom

1997-09-29

2000-05-16

Hess, Douglas

Material or article handling

Pole or tree handlers

14425021, 212231, 212264, 74 892, A01G 2308

Patent

active

06062793&

ABSTRACT:
The invention provides a drive system for extending or retracting a boom. The boom comprises an elongated boom slidably mounted to a vehicle. The drive system comprises: a flat belt extending generally parallel to the boom; a rotatable drum mounted to the vehicle; and a pair of spaced apart rollers adjacent the rotatable drum. The belt is attached to the boom by couplings at either end of the belt. A loop of the belt extends through a gap between the pair of spaced apart rollers and around an outer circumference of the rotatable drum. The gap has a width less than a diameter of the rotatable drum. The drive system can be used to advantage in a forestry machine such as a tree delimber.

REFERENCES:
patent: Re30021 (1979-06-01), Olson et al.
patent: 769947 (1904-09-01), Kramer
patent: 4289177 (1981-09-01), Hammond et al.
patent: 4413661 (1983-11-01), Marchildon
patent: 4428407 (1984-01-01), Bourbeau
patent: 4919175 (1990-04-01), Samson
patent: 5568829 (1996-10-01), Crawford et al.
patent: 5865229 (1999-02-01), Unosen

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