US 4,261,423 AGranted

Field cultivator shank

AssigneeKoehring Company

InventorGerald E. Williamson

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Abstract

An earth working implement such as a field cultivator shank for use on a tool bar of a field cultivator includes a mounting bracket having an upper end and a lower end. The mounting bracket is secured at the lower end of the mounting bracket to the tool bar with the upper end of the mounting bracket extending rearwardly and upwardly of the tool bar. A spring shank is pivotably connected to the lower end of the mounting bracket at a first pivot point with the spring shank extending rearwardly and downwardly of the lower end of the mounting bracket. The spring shank terminates in a rounded end portion. A support bracket which securely engages an upper portion of the spring shank is pivotably connected to the mounting bracket and extends immediately beneath and alongside the spring shank for a portion of the spring shank length. A coil spring biases the spring shank downwardly away from the upper end of the mounting bracket. The coil spring is provided between the upper end of the mounting bracket and the rearward end of the support bracket. Pivotably attached to the upper end of the mounting bracket is an upper end of the coil spring. The mounting bracket preferably extends diagonally along the tool bar. An attachment clamp includes at least first and second flange ends having first and second finger portions which extend away from the attaching clamp so as to bias the attaching clamp away from the mounting bracket. A two position lever mechanism permits an adjustment of a pre-load compression of the coil spring.

An earth working implement, for use on a tool bar of a field cultivator, comprising:

a mounting bracket having an upper end and a lower end;
attachment means for securing the lower end of the mounting bracket to the tool bar, the upper end of the mounting bracket extending rearwardly and upwardly of the tool bar;
a spring shank pivotably connected to the lower end of the mounting bracket at a first pivot point, the spring shank extending rearwardly and downwardly of the lower end of the mounting bracket and terminating in an end portion;
a support bracket securely engaging an upper portion of the spring shank, the support bracket being pivotably connected to the mounting bracket at a first pivot point and terminating in a rearward end, the support bracket having a lower surface extending substantially beneath said upper portion of the spring shank and said support bracket also extending alongside said upper portion of the spring shank;
a coil spring for biasing the spring shank downwardly away from the upper end of the mounting bracket, the coil spring having a generally cylindrical configuration and being provided between the upper end of the mounting bracket and the rearward end of the support bracket;
means for pivotably connecting the coil spring to the rearward end of the support bracket at a second pivot point;
spring guide means for maintaining the generally cylindrical configuration of the coil spring during compression of the spring and for limiting the downward travel of the spring shank and support bracket, said second pivot point of said rearward end of the support bracket being lower than said first pivot point when said spring shank and said support bracket are at a lower end of said limited downward travel of the spring shank and support bracket;
spring pivotal mounting means for pivotably attaching an upper end of the coil spring to the upper end of the mounting bracket;
means for adjusting a pre-load compression of the coil spring, the means for adjusting the pre-load compression of the coil spring including a two-position lever member provided between the coil spring and the support bracket.

6 more elements

Abstract

Claims13