Patent ID: 9580975
Date: 2017-02-28
CPC Classifications: E21B,Y10T

Claim:
1. A cylinder release arrangement which comprises: at least one cylinder, a piston positioned within the cylinder, and a cylinder head closing off one end of the cylinder to thereby form a chamber between the piston and the cylinder head; wherein the cylinder is configured to provide a leakage of fluid from one side of the piston to the other side of the piston when the piston is located a first distance from a sealing position in which the piston is in sealing contact with a sealing surface of the cylinder; and means for controllably releasing the cylinder head from the cylinder subsequent to the leakage of fluid from one side of the piston to the other side of the piston; wherein the means for controllably releasing the cylinder head from the cylinder comprise a release part of the piston and a number of fingers connected to the cylinder head, and wherein when the piston is moved a second distance away from the sealing position, the release part causes the fingers to move out of locking contact with the cylinder to thereby release the cylinder head from the cylinder.