Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1983-05-25
1985-05-14
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
91437, 91464, 251101, 251110, 137270, 13762569, A01B 4502, F16K 3128
Patent
active
045166382
ABSTRACT:
A soil aerating apparatus comprising a towing vehicle, a soil aerating device comprising a drum, tines extending radially from the drum, and a frame for supporting the drum for rotation about a horizontal axis. The frame includes a forward end with a draw arm, and the forward end is pivotally attached to the towing vehicle so that the frame is raised and lowered by moving the draw arm. The apparatus also includes a mechanism for moving the draw arm comprising a hydraulic cylinder including a piston rod and connected between the draw arm and the towing vehicle, and a valve operably connected to the cylinder for extending and retracting said piston rod. The valve includes a valve member movable between a position wherein the valve extends the piston rod, a position wherein the valve holds the piston rod in a fixed position, a position wherein the valve retracts the piston rod, and a position wherein the valve permits the piston rod to extend or retract in response to movement of the draw arm. The apparatus also includes a mechanism for moving the valve member. The mechanism includes a lever pivotally connected to the valve member and pivotally mounted for movement between four positions corresponding to the valve member positions. The mechanism for moving the draw arm also includes a mechanism for releasably securing the lever in the position where the piston rod is free to move.
REFERENCES:
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patent: 2700984 (1955-02-01), Gleasman
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patent: 3228415 (1966-01-01), Geiss
patent: 3346012 (1967-10-01), Williams
patent: 3677281 (1972-07-01), Tennis
patent: 3903623 (1975-09-01), Hyler
patent: 4081034 (1978-03-01), Hines
patent: 4158391 (1979-06-01), Clements
Hicks John E.
Kubat James J.
Johnson Richard J.
Outboard Marine Corporation
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