Abstract A draft and depth control means comprises two divisible portions mounted on a base part and a detachable part of a housing, respectively, with the components of the portions remaining in position on separation of the parts. In the assembled condition the portions are coupled by non-fastening engaging surfaces readily separated on division of the portions. The portion on the detachable part comprises a hydraulic control valve and actuating bell cranks. The portion on the main part includes a control rod and linkages. The linkages comprise a draft control linkage connecting the rod to the draft sensing means, a draft input means setting the draft control linkage to a given height range, an implement position sensing linkage and a maximum depth linkage. A lever is intermediately and pivotally connected to the control rod and the position sensing linkage and the maximum depth linkage pivotally connected to the opposite ends of the lever to limit the implement to a maximum depth.
In a tractor having a draft linkage for connecting the tractor to an implement, hydraulic means for raising and lowering said draft linkage, draft sensing means for measuring changes in draft loads applied to said draft linkage, control means coupled to said draft sensing means and including a control valve connected to said hYdraulic means for controlling the actuating of the hydraulic means in response to said draft sensing means, a housing having a main part and a detachable part with means for securing said detachable part to said main part on assemblage, characterized by said control means being divisible into two portions, one of said portions being mounted on said detachable part in operative relation with said control valve also mounted on said detachable part, said portions remaining in position in the divisible condition and being movable in and out of assemblage with the main part, support means supporting the portion of said control means mounted on said main part and the portion of said control means mounted on said detachable part, on said main part and on said detachable part respectively, to permit movement of said portions into and out of engagement with each other when said main part and said detachable part are in and assembled condition, and resilient means included in said control means for biasing said portions of said control means toward contact with each other when said main part and said detachable part are in an assembled condition.
Claim 2
Dependent Claim
244 words
In a tractor having a draft linkage for connecting the tractor to an implement, hydraulic means for raising and lowering said draft linkage, draft sensing means for measuring changes in draft loads applied to said draft linkage, control means coupled to said draft sensing means and including a control valve connected to said hYdraulic means for controlling the actuating of the hydraulic means in response to said draft sensing means, a housing having a main part and a detachable part with means for securing said detachable part to said main part on assemblage, characterized by said control means being divisible into two portions, one of said portions being mounted on said detachable part in operative relation with said control valve also mounted on said detachable part, said portions remaining in position in the divisible condition and being movable in and out of assemblage with the main part, support means supporting the portion of said control means mounted on said main part and the portion of said control means mounted on said detachable part, on said main part and on said detachable part respectively, to permit movement of said portions into and out of engagement with each other when said main part and said detachable part are in and assembled condition, and resilient means included in said control means for biasing said portions of said control means toward contact with each other when said main part and said detachable part are in an assembled condition.