Apparatus for the provision of vertical drain channels in grass,

Details Apparatus for the provision of vertical drain channels in grass, Apparatus for the provision of vertical drain channels in grass,

1981-03-06

1983-12-27

Shapiro, Paul E.

Earth working

Lawn aerator or perforator, or plug remover

A01B 4502

Patent

active

044225105

ABSTRACT:
A frame is provided journalling a rotary shaft having a lever system for rectilinearly driving at least one set of pins into and out of the ground. The lever system has a pair of substantially parallel spaced rods connected pivotally at one end to the set of pins and at the other end pivotally to the frame and offset from each other. The lower rod is extendible in length when the pins are placed under load and automatically resumes its normal length when the load is removed.

REFERENCES:
patent: 672572 (1901-04-01), Schley
patent: 2056337 (1936-10-01), Archibald
patent: 2347748 (1944-05-01), Melling
patent: 2789522 (1957-04-01), Barton
patent: 3204703 (1965-09-01), Hansen
patent: 3528505 (1970-09-01), Bushmeyer et al.

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