Earth working – Lawn aerator or perforator – or plug remover – Earth removing
Patent
1988-03-15
1989-04-11
Johnson, Richard J.
Earth working
Lawn aerator or perforator, or plug remover
Earth removing
172 84, A01B 4502
Patent
active
048197343
ABSTRACT:
Rocker arms are mounted for pivoting at their centers about a vertical axis on a chassis with the pivot axis in line with a longitudinal slot through which a crank arm projects. The upper end of the crank arm is pivoted to a crank which upon rotation reciprocates the crank shaft vertically. One or more tines project downwardly from the bottom of the crank arm below the longitudinal slot in the chassis through which the lower end of the crank arm projects and within which the crank arm is permitted to oscillate fore and aft during movement of the aerating machine over the turf. A pair of connecting rods are pivotably mounted at one end to vertical studs fixedly mounted to the rocker arm to opposite sides of the vertical pivot axis of the rocker arm on the chassis. The opposite ends of the pair of connecting rods are pivotably coupled to laterally adjacent crank arms and the connecting rods are of equal length to cause the crank arms to oscillate 180.degree. out of phase within the guide slots through which the crank arms pass during alternate projection of the tines of respective crank arms into the turf and retraction therefrom.
REFERENCES:
patent: 1081686 (1913-12-01), McGough
patent: 2223559 (1940-12-01), Fleming
patent: 2638831 (1953-05-01), Ferguson
patent: 2800066 (1957-07-01), Cohrs
patent: 3429378 (1969-02-01), Mascaro
patent: 4602687 (1986-07-01), Hansen
patent: 4606412 (1986-08-01), Classen
patent: 4658909 (1987-04-01), McDermott
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