Fuel delivery safety limit mechanism

In a fluid dispenser having a resettable register for registering the amount of fluid dispensed, a fluid delivery system with control means selectively operable to activate and deactivate the fluid delivery system for dispensing fluid and a limit mechanism for operating the control means to deactivate the delivery system after an established amount of fluid is dispensed, the improvement wherein the limit mechanism comprises trip gearing with a rotary drive gear rotated by the resettable register in accordance with the amount of fluid dispensed and a rotary trip gear in operative intermeshing engagement with the drive gear and rotated thereby in one angular direction during the delivery of fluid from an initial angular position thereof to a trip angular position thereof, the trip gear having a circumferentially extending peripheral recess for receiving the drive gear when the trip gear reaches its trip position, a shiftable trip member rotatably supporting the trip gear and shiftable from a first position of the trip member to a second trip position thereof, when the trip gear receives the drive gear at its trip angular position, to operate the control means to deactivate the dispenser, and reset means for resetting the trip gear to its said initial angular position and the trip member to its first position.