초록 ▼

The disclosure in this patent application includes a retractable in-row tiller device that has a parallelogram carriage structure for supporting the outrigger arm and tiller and for retracting and extending the outrigger arm and tiller in relation to the tractor on which it is mounted. It also inclu

The disclosure in this patent application includes a retractable in-row tiller device that has a parallelogram carriage structure for supporting the outrigger arm and tiller and for retracting and extending the outrigger arm and tiller in relation to the tractor on which it is mounted. It also includes an electro-hydraulic control system with a single wand plant feeler device that provides very accurate and responsive automatic control to guide the tiller around plants and which can be overridden and operated manually with ease and accurateness. It also includes an automatic positive depth control feature operated electro-hydraulically by a gauge wheel.

대표청구항 ▼

In tool apparatus having a tool, a main frame and reversible hydraulic powered motion producing means for moving the tool in one direction with respect of said main frame and in the opposite direction in response to the proximity of an object to the tool, wherein the improvement comprises: solenoid

In tool apparatus having a tool, a main frame and reversible hydraulic powered motion producing means for moving the tool in one direction with respect of said main frame and in the opposite direction in response to the proximity of an object to the tool, wherein the improvement comprises: solenoid valve means having a first position adapted to direct a flow of hydraulic fluid to drive said motion producing means in one direction, a second position adapted to direct a flow of hydraulic fluid to drive said motion producing means in the opposite direction, and a third position for not directing hydraulic fluid to drive said motion producing means in any direction; sensing means for sensing the proximity of the object to the tool; automatic switch means connected to said sensing means for directing an electric current to said solenoid valve means to move said tool in said one direction to a given distance away from said main frame whenever said tool is not within a pre-selected spacial proximity to an object, to move said tool in said opposite direction to a position less than said given distance from said main frame whenever said tool is within said pre-selected proximity to the object and approaching closer to said object, and to prevent movement in either direction whenever said tool is within said pre-selected proximity to the object and not approaching closer to the object even when said tool is less then said given distance from said main frame.