Patent ID: 9217481
Filing Date: 2015-12-22
Classification: B66D,F16D

Abstract:
1. A hydraulically-operated actuator, the actuator comprising: a) a tubular main body, the main body comprising a first end and a second end thereby defining a chamber therebetween, the main body further comprising a first end cap disposed at the first end and a second end cap disposed at the second end, thereby enclosing the chamber, the second end cap further comprising a first aperture for injecting pressurized hydraulic fluid into the chamber and a second aperture for releasing the hydraulic fluid from the chamber; b) a fixed piston comprising first and second ends, the first end operatively coupled to the first end cap within the chamber, thereby defining an annular space about the fixed piston within the chamber; c) a piston cylinder slidably disposed in the chamber, the piston cylinder configured for slidably receiving the second end of the fixed piston; d) at least one spring disposed in the annular space between the first end cap and the piston cylinder, the at least one spring configured to resist the motion of the piston cylinder towards the first end cap; and e) an actuating rod operatively coupled to the piston cylinder, the actuating rod comprising first and second ends, the first end operatively coupled to the head of the piston cylinder, wherein the second end extends from the head of the piston cylinder and through a third aperture disposed through the second end cap.