Pruning apparatus having a helical cutting head

Details Pruning apparatus having a helical cutting head Pruning apparatus having a helical cutting head

1993-08-20

1994-06-21

Bray, W. Donald

Woodworking

Special-work machine

Hinge-seat cutting

30383, 83830, 1442085, 144343, A01G 2302, B27L 100, B27B 3314

Patent

active

053221028

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.

REFERENCES:
patent: 2948311 (1958-10-01), McCollum
patent: 2989097 (1961-07-01), Bombardier
patent: 3565143 (1971-02-01), Wehr
patent: 3945288 (1976-03-01), Olmr
patent: 3967663 (1976-07-01), Loigerot
patent: 4049032 (1977-09-01), Oldenburg et al.
patent: 4218820 (1980-08-01), Cleva
patent: 4619172 (1986-10-01), Perez
patent: 4781228 (1988-11-01), Vaders

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