Two-stage trip release shank assembly

Details Two-stage trip release shank assembly Two-stage trip release shank assembly

A - Human Necessities

01

B

97/76

A01B 61/04 (2006.01)

Patent

CA 1099980

-13- "TWO-STAGE TRIP RELEASE SHANK ASSEMBLY" ABSTRACT OF THE DISCLOSURE An implement shank is pivotally attached to the frame of the implement and normally is maintained in the soil by a heavy-duty coil spring reacting between the shank and a support extending from the frame. The spring mount and shank holder are connected together so that if the shank trips due to striking an obstruction, the connection moves towards an over center line and if the obstruction is maintained, the connection moves over the over center line. When it passes over center, it engages a leaf spring extending from the frame which returns the connection back over center when the obstruc- tion is passed whereupon the coil spring returns the implement into the ground. The coil spring is attached to a resilient member extending from the frame so that the shock load is absorbed as the implement returns to the ground engaging posi- tion, particularly when this return is somewhat rigid due to the heavy-duty nature of the coil spring.

326645

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