US 4,796,678 AGranted

Liquid delivery apparatus

AssigneeTokyo Tatsuno Co., Ltd.

InventorsToshiaki Motohashi, Yasushi Saisu

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Abstract

An apparatus for topping off a fuel tank which is necessary for full tank delivery after false fuel level detection caused by fuel bubbles or splashes. This is made possible by making a spring biased valve sent for a main valve longitudinally movable and providing control means and a mechanism so that despite a trigger being in the actuated position the valve is opened when bubbles or splashes disappear.

Claims8

Dependent claims

Apparatus for liquid delivery comprising a barrel portion having an open free end;

a hollow body portion integrally fixed thereto and having an inlet to form a liquid passage extending therefrom through the barrel portion to said open free end;
a trigger mounted at said body portion so as to be manually actuated;
a main valve arranged downstream from said inlet in the liquid passage in the body portion and having a valve rod to be longitudinally movable together;
a valve set arranged so as to face said main valve and having a wall exposed in the liquid passage around said main valve;
first spring means for urging said main valve toward said valve seat for normally closing the liquid passage;
an extended bar arranged so as to be longitudinally moved by the actuated trigger;
second spring means for urging said bar toward said trigger;
means for disengageably engaging said bar with said valve rod so as to be longitudinally movable together;
and means for detecting liquid level rising up close to the open free end of said barrel portion and adapted to actuate said engaging means so as to disengage said bar from said valve rod when detecting liquid inclusive of bubbles and splashes thereof;
in which
said valve seat is made slidingly movable toward said main valve by third spring means and apart therefrom by pressure force of liquid pumped up through said inlet in the liquid passage to be just in front of said main valve and the exposed wall of said valve seat against the force of said third spring, to which said main valve follows by the force of said first spring means;
whereby when actuating the trigger, the bar and consequently the valve rod engaged therewith is longitudinally moved against the force of said first spring means so as to open the liquid passage;
when said detecting means detects liquid splashes and bubbles, said valve rod is disengaged from said bar so that said valve rod is longitudinally moved by said first spring means despite of that the trigger is still actuated and the main valve closes the liquid passage;
and,
when liquid is freed from pressure, the main valve seat is slidingly moved toward the main valve by the force of said third spring means so that said detecting means now detecting no splashes and bubbles actuates said engaging means so as to engage said bar with said valve rod again.

12 more elements

Dependencies are inferred from the claim text.

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Abstract

Apparatus for liquid delivery comprising a barrel portion having an open free end;

a hollow body portion integrally fixed thereto and having an inlet to form a liquid passage extending therefrom through the barrel portion to said open free end;
a trigger mounted at said body portion so as to be manually actuated;
a main valve arranged downstream from said inlet in the liquid passage in the body portion and having a valve rod to be longitudinally movable together;
a valve set arranged so as to face said main valve and having a wall exposed in the liquid passage around said main valve;
first spring means for urging said main valve toward said valve seat for normally closing the liquid passage;
an extended bar arranged so as to be longitudinally moved by the actuated trigger;
second spring means for urging said bar toward said trigger;
means for disengageably engaging said bar with said valve rod so as to be longitudinally movable together;
and means for detecting liquid level rising up close to the open free end of said barrel portion and adapted to actuate said engaging means so as to disengage said bar from said valve rod when detecting liquid inclusive of bubbles and splashes thereof;
in which
said valve seat is made slidingly movable toward said main valve by third spring means and apart therefrom by pressure force of liquid pumped up through said inlet in the liquid passage to be just in front of said main valve and the exposed wall of said valve seat against the force of said third spring, to which said main valve follows by the force of said first spring means;
whereby when actuating the trigger, the bar and consequently the valve rod engaged therewith is longitudinally moved against the force of said first spring means so as to open the liquid passage;
when said detecting means detects liquid splashes and bubbles, said valve rod is disengaged from said bar so that said valve rod is longitudinally moved by said first spring means despite of that the trigger is still actuated and the main valve closes the liquid passage;
and,
when liquid is freed from pressure, the main valve seat is slidingly moved toward the main valve by the force of said third spring means so that said detecting means now detecting no splashes and bubbles actuates said engaging means so as to engage said bar with said valve rod again.

12 more elements