Earth working – Lawn aerator or perforator – or plug remover
Patent
1988-02-23
1989-06-20
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
172548, A01B 4502
Patent
active
048402320
ABSTRACT:
Soil aerating equipment has a frame moveable in an intended direction of travel, and at least a pair of shafts freely rotatably mounted on the frame for rotation about the shaft longitudinal axes. The shafts extending in rearwardly inclined opposite directions on opposite sides of a centre line of the frame extending in the direction of travel. The rearward inclination of the shafts is adjustable to desired angles in the range of from about 90.degree. to about 120.degree. to the direction of travel. Each shaft carries a series of soil-engaging substantially planar tines extending therefrom in vertical planes and positioned to sequentially engage and penetrate the soil with consequent rotation of the shafts when the frame is moved in the direction of travel. Each tine has a central longitudinal axis which extends behind the shaft rotational axis at a distance therefrom in the range from about 0.25 to about 1.75 inches, and each tine is twisted about the tine central longitudinal axis at an angle to a vertical plane parallel to the direction of travel in the range of from about 1.degree. to about 30.degree..
REFERENCES:
patent: 396374 (1889-01-01), Sherman
patent: 1123613 (1915-01-01), Stevenson
patent: 1812708 (1931-06-01), Nygard
patent: 1858948 (1932-05-01), Bird
patent: 2574772 (1951-11-01), Zorn
patent: 4383580 (1983-05-01), Huxford
Aer Way Advertising brochure of Holland Equipment, Melton, Victoria Australia 1980.
Delbridge Robert F.
Fors Arne I.
Holland Equipment Limited
Johnson Richard J.
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