|
(11) | EP 1 077 289 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Ground working device |
| (57) A ground working device is formed from a sub-frame (18) having a first side and a
second side, plural discs (28) mounted for rotation on the sub-frame between the first
side and the second side about an axis that extends from the first side to the second
side; and a set of scoops (42) mounted on each disc in ground contacting position.
The scoops efficiently lift the ground surface material, which falls to the ground
in a sorted manner with coarser material on top. A motor is operatively connected
to the plural discs for rotating the discs about the axis. Each scoop in each set
of scoops has a ground working face that extends transversely to the disc on which
the respective scoop is mounted. The scoops each have concave ground contacting surfaces.
Each scoop is received in a respective slot (37) in the disc in which the respective
scoop is mounted. The ground working device is mounted on a main frame, which is provided
with ground engaging wheels. The sub-frame is retractably mounted on the main frame.
Plural individually retractable teeth (118) are secured to the frame and extend away
from the lower part of the frame in a ground contacting array. Teeth for the ground
working device are formed as part of a retractable tooth assembly (110). A retractable
tooth assembly preferably comprises a tooth carrier (112) on one end of which a tooth
is slidably mounted, and on the other end of which is mounted a tooth position fixative,
with a position adjustable rigid link connecting the tooth position fixative and the
tooth. The retractable tooth assembly preferably extends through the frame from a
first side to a second side, the retractable tooth assembly being secured to the frame
on the first side and the tooth forming a working end on the second side. |