Patent ID: 8272404
Filing Date: 2012-09-25
Classification: F15B,F15C,Y10T

Abstract:
1. A method of generating a periodic impulse comprising: injecting fluid through a first power path into a first side of a cylinder, the cylinder being filled with fluid, the injection causing a piston positioned within the cylinder to move away from the first side of the cylinder, the piston pushing fluid out of a second side of the cylinder; injecting fluid through a first feedback path into the first power path; blocking a first port with at least a portion of the piston to substantially stop a flow of a fluid through a main passage, thereby creating an impulse; injecting fluid from a second trigger port, wherein the injection of fluid from the second trigger port interrupts the injection of fluid though the first feedback path; injecting fluid through a second power path into the second side of the cylinder, the injection causing the piston to move away from the second side of the cylinder, the piston pushing fluid out of the first side of the cylinder; injecting fluid through a second feedback path into the second power path; and unblocking the first port.