Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1985-03-25
1987-04-21
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
172 95, A01B 4502, A01B 3528
Patent
active
046589090
ABSTRACT:
A turf aerating machine including a plurality of tyne arms, having tynes attached to their lower ends, and extending substantially vertically downwardly from the cranks of a crankshaft located transversely of the direction of travel of the aerator. A drive linkage connects the crankshaft to the power take-off of the tractor or other power source and is driven such that, as the aerator is moved forward, the crankshaft moves with the lower arc of its rotation in the rearward direction. The tyne arms are projected into the ground as the respective crank moves through its lower arc and they are lifted clear of the ground as the crank moves through the upper arc of its travel. While the tynes are engaged with the ground, the tyne arm is maintained in a substantially vertical orientation by the rearward motion of the respective crank through the lower arc of its rotation. The lower end of each tyne arm extends through a slot running longitudinally of the aerator such that lateral movement of the tyne arm is prevented. Each tyne arm is biased toward the forward end of its slot when the tyne is engaged in the ground due to the forward motion of the aerator over the ground. When the tyne is retracted from the ground by the crankshaft the tyne arm is returned to the forward end of its slot by the spring.
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Howard Rotavator Company, Sales Literature, "Howard Turf-Quaker/The Model HA-TQ," Feb. 1980, (Form 966/Z-80/35M/IL).
Livingstone David J.
McDermott Brian P.
Brown Terrence L. B.
Greencare Pty., Limited
Johnson Richard J.
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