Tree shear head and controls therefor

Details Tree shear head and controls therefor Tree shear head and controls therefor

1979-02-05

1981-01-13

Bray, W. Donald

Woodworking

Special-work machine

Tree felling

144 3D, 91520, 91526, 91531, A01G 2308

Patent

active

042444055

ABSTRACT:
A tree shear head includes a shear, a grapple tong and an accumulator tong which are positioned by respective double-acting hydraulic actuators controlled by selectively actuatable solenoid-operated valves such as to place the shear head either in a non-accumulate mode wherein both tongs operate concurrently to grasp and release trees one-by-one or an accumulate mode wherein the tongs are individually operated in a sequence resulting in the accumulation of a plurality of cut trees.

REFERENCES:
patent: 3875983 (1975-04-01), Kurelek
patent: 3910326 (1975-10-01), Tucek
patent: 3994325 (1976-11-01), Cryder et al.
patent: 4039009 (1977-08-01), Lindblom
patent: 4039010 (1977-08-01), Tucek
patent: 4077445 (1978-03-01), Wirt

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