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US 5,309,957 AGranted
Fuel dispensing apparatus capable of automatically discriminating fuel sort
AssigneeTatsuno Corporation
InventorYasushi Saisuu
Life of this patent
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AssigneeTatsuno Corporation
InventorYasushi Saisuu
Estimating the term…
A fuel dispensing apparatus for automatically discriminating a sort of fuel in a fuel tank of a vehicle in advance of fuelling, by sucking the fuel vapor in the tank into a chamber provided on a fuelling nozzle and accomodating a gas sensor for sensing the vapor introduced into the chamber. The nozzle is further provided with an air ejecter having a base port communicated with an air supplying means through an air hose, a top port for ejecting the air from the base port toward the atmosphere when it is opened, and a side port connected with the gas sensor chamber. A valve body is movably arranged in the nozzle and moved in a forward direction by a nozzle lever and in a backward direction by a pressure of fuel supplied to the nozzle so as to open and close the top port of the air ejector. When the nozzle lever is pulled after the nozzle is inserted into the fuel tank, the valve body is moved in the forward direction to open the top port to the atmosphere, which results in generating negative pressure in the gas sensor chamber which sucks the vapor in the fuel tank into the chamber so as to determine whether the fuelling is allowed or not, and when the valve body is moved backward by the fuel pressure during the fuelling operation, the top port is closed so that the air from the ejector is directed to the gas sensor chamber to sweep the vapor away from the chamber.
A fuel dispensing apparatus capable of discriminating a sort of fuel, comprising a main body which is provided with means for supplying air under pressure to a fuelling nozzle which is formed with an opening at the tip end thereof and comprises a gas sensor chamber communicating with said opening and having a gas sensor contained therein, means connected to said chamber for allowing supplied air to burst into the atmosphere through an air ejecting port so as to generate negative pressure in the chamber connected thereto, and a change-over valve connected to said means having a rod fixedly mounted thereon with a valve body which is movable between a first position where said air ejecting port is closed thereby so that supplied air is compelled to flow into the gas sensor chamber for sweeping air contained therein and a second position whereby said air ejecting port is opened so that fuel vapor may be sucked from said gas sensor chamber by said generated negative pressure so that the gas sensor may identify a fuel sort by virtue of particular properties thereof.
Dependencies are inferred from the claim text.