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US 5,322,102 AGranted
Pruning apparatus having a helical cutting head
OwnerEdward G. Livingstoninventor
Life of this patent
Estimating the term…
Abstract
A pruning device having a chain saw with a flexible chainbar and a double-articulated cutting chain. The chainbar has a relaxed shape of a helix for encircling a tree trunk. The double-articulated cutting chain can curve about two lateral axes so that it may follow the perimeter of the helical chainbar and cut branches from the tree. A remotely located power supply is provided on a wheeled cart for powering the chain saw and supporting and operating a support wand that supports the chain saw and raises and lowers it along the tree trunk.
Claims17
A pruning apparatus, comprising:
- (a) an elongate, double-articulated cutting chain curvable about a first lateral axis and a second lateral axis;
- (b) a chainbar that is flexible about said first lateral axis for carrying said cutting chain;
- and
- (c) a power source for driving said cutting chain on said chainbar for cutting limbs from trees.
1 more element
A pruning apparatus, comprising:
- (a) an articulated cutting chain having a plurality of cutting teeth;
- (b) a flexible, helical-shaped chainbar for carrying said cutting chain;
- (c) a doghead for carrying said chainbar;
- and
- (d) a power source for driving said cutting chain so that said chain can perform pruning operations.
2 more elements
Dependencies are inferred from the claim text.