Fuel cartridge for a gas-powered fixing tool and a gas-powered fixing tool having such a cartridge

A fuel cartridge for a gas-powered fastener-driving tool, the fuel cartridge comprising:

• a body having a top end and a bottom end that defines an internal fuel storage cavity, wherein the top end of the body is configured to be inserted at least partially into and removed from a housing defined by a case of the tool via translation along a longitudinal axis;
• a connection and fuel dispensing end fitting connected to the top end of the body and configured to engage an end fitting of the tool within the housing;
• and
• a crown ring circumferentially surrounding the top end of the body and extending at least partially around the connection and fuel dispensing end fitting, the crown ring having a stud axially extending from a top surface of the crown ring and a hook axially extending from the top surface of the crown ring, wherein the stud defines a first cam surface extending partially around the longitudinal axis, wherein the hook defines a third cam surface, and wherein the stud and the hook are positioned in an axial and radial misalignment relative to one another on the crown ring.