초록 ▼

A tramlining device is provided for a seed drill having shutters associated with respective seed spouts and controlled by individual fluid pressure operated actuators for improved flexibility in selecting the tramline spacing. The actuators are preferably such that when pressurized they close the sh

A tramlining device is provided for a seed drill having shutters associated with respective seed spouts and controlled by individual fluid pressure operated actuators for improved flexibility in selecting the tramline spacing. The actuators are preferably such that when pressurized they close the shutters to produce tramlines. Fluid pressure is tapped from the rams that force the coulters into work. Preferably, a control valve in the fluid supply line comprises a valve member that is urged closed by the supply pressure but is opened by a plunger controlled by a bout register. Preferably, a solenoid operated plunger is provided to override operation of the bout register.

대표청구항 ▼

A tramlining device for use with a seed drill having a hopper and a series of coulters mounted on a frame with means for raising and lowering said coulters, comprising, bout registering means for registering a number of successive bouts, indexing means responsive to raising of the coulters at the en

A tramlining device for use with a seed drill having a hopper and a series of coulters mounted on a frame with means for raising and lowering said coulters, comprising, bout registering means for registering a number of successive bouts, indexing means responsive to raising of the coulters at the end of successive bouts and operative to index said bout registering means between successive registered bout numbers, individual inhibiting means each adapted to be changed between an inoperative state in which the discharge of seed or other granular material is permitted from a respective drill spout and an operative state in which such discharge is inhibited, and linkage means which responds to selected bout numbers registered by said bout registering means to change the state of said inhibiting means, the linkage means including a separate fluid pressure operated actuator to change the state of each inhibiting means and valve means controlled by the bout registering means for supplying pressurized fluid to said actuator at selected registered bout numbers.