Apparatus for controlled cutting down of trees

Details Apparatus for controlled cutting down of trees Apparatus for controlled cutting down of trees

1981-01-12

1983-01-18

Bray, W. D.

Woodworking

Special-work machine

Tree felling

91520, 144 3D, A01G 2308

Patent

active

043687636

ABSTRACT:
Cutting apparatus having a chain saw operated by a hydraulic motor as it is simultaneously moved towards an anvil by a hydraulic cylinder in a scissor cutting action. A valve is connected to the pressure line of the hydraulic cylinder to divert hydraulic fluid from said line to control the energization of the cylinder in accordance with the load put on the motor by the saw chain. This valve includes operating means to control the flow of fluid therethrough from zero to sufficient to stop the hydraulic cylinder. A line extends from the pressure line of the hydraulic motor to the valve operating means to increase and decrease the fluid flow through the valve respectively in accordance with increases and decreases of the pressure in the feed line of the motor inversely to control the pressure in the feed line of the cylinder.

REFERENCES:
patent: 3874432 (1975-04-01), Albright

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