Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1984-10-04
1986-12-30
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
172 95, A01B 4502, A01B 3520
Patent
active
046321896
ABSTRACT:
A self-propelled lawn aerating machine includes a plurality of generally vertically reciprocally movable tines operated by a cam shaft for removing plugs of soil from a lawn. The tines are spring biased upwardly and in forward direction toward a bumper board located forward of the tines. When withdrawn from the lawn the tines strike the bumper board with sufficient force to break the soil plugs and cause the resulting loose soil to be scattered over the surface of the lawn as the machine moves along an aerating path. The bumper board has a raised position wherein it supports the tines in an idling position above the surface of the ground while the machine is moved across walkways, driveway, and the like.
REFERENCES:
patent: 1413910 (1922-04-01), Guerra y Marrero
patent: 1477097 (1923-12-01), Anderson et al.
patent: 1853079 (1932-04-01), Plant
patent: 1939897 (1933-12-01), Hill
patent: 2580236 (1951-12-01), Mascaro
patent: 3171498 (1965-03-01), Logan
patent: 3802513 (1974-04-01), Ploenges
patent: 3878899 (1975-04-01), Jones
patent: 3926131 (1975-12-01), Collins
patent: 4084642 (1978-04-01), Killion
patent: 4154305 (1979-05-01), Prewett
Brown Terrence L. B.
Johnson Richard J.
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