Apparatus for the provision of vertical drain channels in grass, fields, meadows etc.
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 27, 1983
Grant Date -
N/A
app pub date -
Mar 6, 1981
filing date -
Mar 10, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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