Earth working – Lawn aerator or perforator – or plug remover
Patent
1998-01-05
1999-12-21
Novosad, Christopher J.
Earth working
Lawn aerator or perforator, or plug remover
172 94, 172 95, A01B 4502
Patent
active
060036133
ABSTRACT:
The invention relates to an apparatus for aerating a ground layer including a frame movable along a ground surface and a number of substantially vertically placed aerating pins movable in and out of the ground layer. Each pin is engaged by a pivot arm mounted on the frame for pivoting, and a guide arm is connected to the frame at a distance from the position where the pivot arm engages the frame. A drive element is provided for causing reciprocal pivoting of the pivot arm during the movement of the apparatus along the ground layer. The connections of the pivot arm to the frame and the aerating pin and the connections of the guide arm to the frame and the aerating pin substantially form corners of a parallelogram in the non-loaded state of the aerating pin. At least one of the sides of this parallelogram is changeable in length such that the bottom part of the pin is displaced relative to the top part of the pin in a direction opposed to the direction of movement of the frame. All pivot arms and guide arms engage the frame by way of a central engaging member, the position of which is adjustable relative to the frame.
REFERENCES:
patent: 4236582 (1980-12-01), Hastings
patent: 4602687 (1986-07-01), Hansen
patent: 5570746 (1996-11-01), Jones et al.
Novosad Christopher J.
Redexim Handel-en Exploitatiemaatschappij
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