Patent ID: 8763713
Filing Date: 2014-07-01
Classification: A01C,Y02P

Abstract:
1. An agricultural implement for use with a towing frame hitched to a tractor having a hydraulic system for supplying pressurized hydraulic fluid to said agricultural implement, said agricultural implement comprising at least one row unit comprising an attachment frame adapted to be rigidly connected to said towing frame, a support member pivotably coupled to said attachment frame to permit vertical pivoting movement of said support member relative to said attachment frame, a soil-engaging tool coupled to said support member, a hydraulic cylinder coupled to said support member for urging said support member downwardly toward the soil, said hydraulic cylinder including a movable ram extending into said hydraulic cylinder, a hydraulic line coupled to said hydraulic cylinder for supplying pressurized hydraulic fluid to said hydraulic cylinder, a controllable pressure control valve in said hydraulic line for controlling the pressure of hydraulic fluid supplied to said hydraulic cylinder through said line, a pressure sensor connected between said hydraulic cylinder and said support member for producing an electrical signal corresponding to the pressure on said soil-engaging tool, and a controller coupled to said pressure sensor and said controllable pressure control valve, said controller being adapted to receive said electrical signal from said pressure sensor and produce a control signal for controlling said controllable pressure control valve thus the supply of said hydraulic fluid to said hydraulic cylinder.