John C Crews

US Patent:

20060130933, Jun 22, 2006

Filed:

Dec 22, 2004

Appl. No.:

11/017801

Inventors:

George Smith - Hagerstown MD, US
John Crews - Hagerstown MD, US

International Classification:

B27L 1/00

US Classification:

144208200

Abstract:

A tree trimming device that automatically climbs a tree or other vertical member and shears limbs or debris as it climbs has an anchor structure, a cutting assembly, vertical connecting pistons, and a cutting blade assembly. The anchor structure and the cutting assembly may be attached by vertical connecting pistons. The device climbs vertical members by clamping the anchor structure to the tree or other vertical member, then extending the vertical connecting pistons, which forces the cutting assembly to move up the vertical member, shearing limbs or other debris as it moves. Once the vertical connecting pistons are extended, the cutting assembly may be clamped to the tree, and the vertical connecting pistons may be retracted, thus pulling the anchor structure up the vertical member towards the cutting assembly. The process may be repeated until the vertical member is trimmed to the desired height. The process may be reversed to lower the device back to the ground.