Filler pipe end structure, in particular for vehicle tank

Claim 1

An end structure for fixing to an end portion of a filler pipe of a tank for receiving a liquid distributor nozzle and precluding supply of ''''non-regulation'''' liquid to the tank, said end structure comprising in combination: a tubular member having a flanged entrance end adapted to receive a filler cap, an iMperforate wall, and a first transverse wall defining a constricted passage in the tubular member remote from said entrance end, a valve member operative to close and open said constricted passage, yieldable means for yieldably biasing said valve member to a passage-closing position of the valve member, and a second transverse wall disposed in said tubular member adjacent said entrance end and defining a second passage, the two transverse walls and said tubular member defining a chamber of relatively small volume and said constricted passage having a first predetermined size slightly larger than the exterior of a ''''regulation'''' liquid distributor nozzle and capable of allowing the passage through the first wall of a ''''regulation'''' liquid distributor nozzle with a small clearance between the nozzle and the constricted passage while precluding the passage therethrough of a ''''nonregulation'''' liquid distributor nozzle and said second passage having a second predetermined size, larger than the first predetermined size, slightly larger than the exterior of a ''''non-regulation'''' liquid distributor nozzle, and capable of allowing the passage through the second wall of a ''''non-regulation'''' liquid distributor nozzle with a small clearance between the nozzle and the second passage, said valve member biasing means being capable of holding the valve member in its constricted passage closing position against the pressure of said liquid and allowing the valve member to move to its constricted passage opening position upon exertion of a thrust on the valve member by the ''''regulation'''' liquid distributor nozzle.