Tree shear actuator restraint system

Details Tree shear actuator restraint system Tree shear actuator restraint system

1977-03-07

1978-03-07

Schran, Donald R.

Woodworking

Special-work machine

Tree felling

83600, 92161, 144 3D, A01G 2308

Patent

active

040774465

ABSTRACT:
A tree shear head includes a frame which supports a pair of parallel crank shafts which are respectively linked to a pair of shear blades for moving the latter together into the trunk of a tree being sheared. The crank shafts are rotated by means of an actuator including a cylinder in which a pair of piston and piston rod units are mounted with the rods projecting oppositely and being respectively pivotally connected to a pair of crank arms respectively formed integrally with the pair of crank shafts. To prevent the cylinder of the actuator from shifting axially along the piston rods, a pair of links are connected between the cylinder and the frame, and for preventing the cylinder from rotating about the piston rods, a pair of rollers are mounted on the cylinder and engage the frame.

REFERENCES:
patent: 2641942 (1953-06-01), Mueller
patent: 3808909 (1974-05-01), Johnson
patent: 3826295 (1974-07-01), Johnson et al.

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