Title: Apparatus for the provision of vertical drain channels in grass, fields, meadows etc.

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.

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Inventors: De, Ridder Arie-jan (Soesterberg, NL)

Application Number: 06/241211
Filing Date: 1981-03-06
Publication_date: 1983-12-27
Assignee: Redexim, Holding (CH)

Primary Class(es): 172/21
Other Classes: A01B45/02; A01B45/00; A01B45/02
US Patent Ref:

0672572	April, 1901	Schley	172/264
2056337	October, 1936	Archibald	172/21	Lawn spiker
2347748	May, 1944	Melling	172/21	Turf perforator
2789522	April, 1957	Barton	172/21	Apparatus for injecting materials into the earth
3204703	September, 1965	Hansen	172/21	Soil cultivator apparatus
3528505	September, 1970	Bushmeyer et al.	172/264	EARTHWORKING TOOL RELEASE MECHANISM

Other Refs: GB661287

November, 1951

172/21

Primary Examiner: Shapiro, Paul E.
Assistant Examiner:
Attorney: Schaffer, Murray

Claims:

I claim: