Back to results
US 4,554,977 AGranted
Combined harrow and harrow bar
AssigneeBer-Vac Inc.
InventorBertrand Vachon
Life of this patent
Estimating the term…
Abstract
A cultivator of the type having a vertically movable harrow bar followed by a vertically movable harrow roller. A plurality of springs biases the roller down against the ground. The springs are operatively connected to the harrow bar in a manner to have vertical movement of the bar automatically vary the pressure exerted by the roller.
Claims1
A cultivator comprising:
- a main frame;
- a first support means pivotally mounted on the frame and extending rearwardly therefrom, said first support means carrying an upwardly and rearwardly extending arm adjacent the frame;
- a harrow bar mounted rearwardly on the first support means;
- a second support means pivotally mounted on the frame and extending rearwardly therefrom above the first support means;
- a cylindrical harrow mounted rearwardly on the second support means and spaced rearwardly from the harrow bar, said cylindrical harrow having helical blades thereon;
- and
- at least one resilient means connecting the harrow bar to the cylindrical harrow in a manner whereby movement of the harrow bar in an upward direction automatically increases the downward pressure applied by the cylindrical harrow, said resilient means being fastened at one end to the arm carried by said first support means and at its other end to the second support means near the cylindrical harrow, said resilient means comprising a spring attached at one end to one end of a length of chain.
4 more elements
Dependencies are inferred from the claim text.