AUTOMATIC DEPTH CONTROL DEVICE FOR TILLAGE UNITS
First Claim
1. In an earth working implement, the combination of a wheeled frame, a vertically movable support arm pivoted to said frame and extending rearwardly therefrom, an earth engaging tool carried by said support arm for raising and lowering movement relative to the frame, a fluid operator mounted on the frame and operatively connected to said support arm for raising and lowering said tool, and a depth control mechanism comprising a control arm movable with and extending forwardly from said support arm, a lever pivotally mounted on said frame at a point intermediate the ends of the lever, said lever having front and rear ends, a link pivotally connecting said control arm to the rear end of said lever, a pair of vertically spaced micro-switches disposed respectively above and below the front end of said lever and selectively actuated thereby as a function of lowering and raising of said tool relative to said frame, a shaft vertically slidable in said frame forwardly of said lever, a ground engaging sensor element provided at the lower end of said shaft, and a detent provided on the upper end portion of the shaft, said detent being disposed between said vertically spaced microswitches for selectively actuating the same as a function of raising and lowering of said frame relative to the ground, and means operatively connecting said micro-switches to said fluid operator for actuating the latter selectively in opposite directions.
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Accused Products
Abstract
The cultivating element rock shaft has an extension actuating micro-switches in conjunction with a floating sensing arm. The micro-switches operate solenoids which control the valves connected to the hydraulic piston and cylinder assembly for raising and lowering the elements either manually or automatically.
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Citations
2 Claims
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1. In an earth working implement, the combination of a wheeled frame, a vertically movable support arm pivoted to said frame and extending rearwardly therefrom, an earth engaging tool carried by said support arm for raising and lowering movement relative to the frame, a fluid operator mounted on the frame and operatively connected to said support arm for raising and lowering said tool, and a depth control mechanism comprising a control arm movable with and extending forwardly from said support arm, a lever pivotally mounted on said frame at a point intermediate the ends of the lever, said lever having front and rear ends, a link pivotally connecting said control arm to the rear end of said lever, a pair of vertically spaced micro-switches disposed respectively above and below the front end of said lever and selectively actuated thereby as a function of lowering and raising of said tool relative to said frame, a shaft vertically slidable in said frame forwardly of said lever, a ground engaging sensor element provided at the lower end of said shaft, and a detent provided on the upper end portion of the shaft, said detent being disposed between said vertically spaced microswitches for selectively actuating the same as a function of raising and lowering of said frame relative to the ground, and means operatively connecting said micro-switches to said fluid operator for actuating the latter selectively in opposite directions.
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2. The device as defined in claim 1 which is further characterized in that said detent is vertically adjustably mounted on said shaft.
Specification
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Current AssigneeDyck F. Ben, Ralph Sweet
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Original AssigneeDyck F. Ben, Ralph Sweet
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InventorsSweet, Ralph, Dyck, F. Ben
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Primary Examiner(s)Pulfrey, Robert E.
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Assistant Examiner(s)Rader, R. T.
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Application NumberUS04/883,368Time in Patent Office869 DaysField of Search172/4 56/DIG.15US Class Current172/4CPC Class CodesA01B 35/16 with rotating or circulatin...A01B 63/10 operated by hydraulic or pn...
