Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1986-02-03
1987-05-05
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
172 43, A01B 4502
Patent
active
046624562
ABSTRACT:
A hollow tine for a self-propelled lawn aeration machine is formed by a U-shaped metal plate having a stud projecting internally of the plate and welded thereto at one end. The U-shaped metal plate has an oblique cutting edge at the end remote from the stud, includes side edges parallel to each other to define a narrow slot extending from the cutting edge to the stud. The cutters where the oblique cutting edges meet the side edges of the U-shaped metal plate are pinched in to reduce the cross-section of the hollow tine formed thereby to facilitate the release of a plug cut from the turf during penetration of the tine into the turf. The handle assembly pivotably mounted to a lawn aeration machine platform at one end has a wheel rotatably mounted thereto, and the handle is rotated and adjustably locked in a first position in which the chassis end is raised to in turn raise a tine support and drive mechanism above the turf to prevent tine penetration of the turf, and a second locking position with the tine support and drive mechanism is lowered to effect penetration of a plurality of tines in sequence into the underlying turf and to effect plug removal therefrom after tine retraction.
REFERENCES:
patent: 2236562 (1941-04-01), Brandes
patent: 2638831 (1953-05-01), Ferguson
patent: 3429378 (1969-02-01), Mascaro
patent: 3534818 (1970-10-01), Mascaro
patent: 3802513 (1974-04-01), Ploenges
patent: 4154305 (1979-05-01), Prewett
patent: 4336760 (1982-06-01), Cohen
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