Earth working – Plural relatively movable tools – Tool pivots on pivoted member when member moves
Patent
1994-03-22
1996-02-20
Reese, Randolph A.
Earth working
Plural relatively movable tools
Tool pivots on pivoted member when member moves
172622, A01D 7700, A01B 6104
Patent
active
054921821
ABSTRACT:
A harrow comprises an elongate tool bar formed in three sections including a central section and two wing sections all of which can rotate about a longitudinal axis, The wing sections are coupled by pivot couplings which allow the wing sections to fold rearwardly in the transport position. The tool bar carries a number of harrow elements each of which is formed by a rigid frame defined by longitudinal rails and welded cross bars with the frame carrying a plurality of tine support bars. A push rod simultaneously rotates all of the tine support bars about their respective axis to vary the angle of the tine in contact with the ground. The angle of the tines of all of the harrow elements are adjusted simultaneously by a number of rocker shafts mounted on the tool bar and operated by rephasing cylinders. Each push bar of each harrow element is attached to the respective rocker shaft for actuation. The harrow frame is mounted on a bracket passing underneath the square section tool bar and pivots about a horizontal axis just rearward of the tool bar with tension springs forwardly of the tool bar pulling the frame upwardly. The tool bar can be rotated beyond the horizontal position to apply downward pressure on the harrow frame against the ground.
REFERENCES:
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patent: 4003603 (1977-01-01), Stemler et al.
patent: 4127341 (1978-11-01), Stevens
patent: 4213506 (1980-07-01), Hake
patent: 4411321 (1983-10-01), Riach
patent: 4506898 (1985-03-01), Herron
patent: 4896730 (1990-01-01), Jarrett et al.
Battison Adrian D.
Pezzuto Robert
Reese Randolph A.
Thrift Murray E.
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