Patent ID: 6601386
Filing Date: 2003-08-05
Classification: E02F,F15B,Y10T

Abstract:
A lever-operated actuator drive unit comprising:an operating lever; four pistons respectively arranged at a right above position, a right below position, a left below position and a left above position, the pistons moving relative to tilting direction and amount of tilting motion of the operating lever; displacement signal generating means for generating displacement signals in magnitudes corresponding to movement of the four pistons; right and left traveling actuators corresponding to the four pistons and respectively receiving the displacement signals from the displacement signal generation means, and the right and left actuators respectively moving in forward and backward directions corresponding to the tilting direction of the operating lever and in amounts corresponding to the amount of tilting motion of the operating lever on the basis of the displacement signals generated by the displacement signal generating means; a forward direction of the left traveling actuator corresponding to the piston arranged at the right above position, a backward direction of the right traveling actuator corresponding to the piston arranged at the right below position, a backward direction of the left traveling actuator corresponding to the piston arranged at the left below position, and a forward direction of the right traveling actuator corresponding to the piston arranged at the left above position; and when one of the four pistons is moved, the displacement signal generating means generates a displacement signal and one of the right and left traveling actuators corresponding to the displaced piston moves in a direction and in an amount corresponding to the displacement signal being generated.