Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1985-01-22
1986-08-19
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
172 88, 74522, A01B 4502
Patent
active
046064117
ABSTRACT:
Paired, side by side sets of upper and lower wheels are connected together and driven by jack shafts pivotally mounted at respective ends to the upper and lower wheels of each set. One common shaft rotatably mounts the upper wheels, and a second shaft mounts the lower wheels for rotation about common axes to effect driving of the upper wheels and lower wheels in unison. The jack shafts joining the upper and lower wheels, respectively, of each set, are angularly offset to achieve desired timing and rotation of the wheels in unison and the sequence in projection and retraction of tines mounted through the jack shafts to the lower wheels of each set. The arrangement insures tine entry and retraction from the ground perpendicular to the ground. It also permits doubling the RPM of the wheels to increase the force driving the tines into the turf. Machine propulsion is effected automatically as a result of driving the tines in the ground and retraction of same.
REFERENCES:
patent: 2659285 (1953-11-01), Burr
patent: 2688907 (1954-09-01), Joy
patent: 3022834 (1962-02-01), Ruka
patent: 3429378 (1969-02-01), Mascaro
patent: 3802513 (1974-04-01), Ploenges
patent: 3986562 (1976-10-01), Killion
patent: 4084642 (1978-04-01), Killion
patent: 4154305 (1979-05-01), Prewett
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