Note: Descriptions are shown in the official language in which they were submitted.
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The invention relates to fuel dl~penslng nozzle~
h~ving automatic ~hut-off mean~ re8ponslve to fuel level and
vapor pressure in the tank being fllled.
According to the invention there i8 provided a
liquid dispen~ing nozzle, a body having an inlet, an outlet and
liquld passa~e means therebetween lncluding a main valve con-
trolling the flow of liquid from ~aid inlet to said outlet,
means resillently bla~ing said main valve closed, a spout
: connected to said outlet and adapted for insertion in the inlet
opening of a tank, manually actuated means for opening said
main valve against said resilient means, Venturi means in ~aid
fuel passage means including a vacuum take-off, a vacuum
chamber, means connecting said Venturi vacuum take-off ~o said
vacuum chamber, means re8ponsive to vacuum w~thin said chamber
caused by the flow of liquid through said Venturi means
operatively connected to said manually actuated means for re-
lea~ing the sa~e and thereby permitting said resilient means to
close said mean valve, vent passage means communicating with said
vacuum chamber to render 8aid vacuum-respon8ive means inoper-
ative when ~aid vent passage is open and having a port insert-
ible in the ta~k with said spout, said vent pas8age means
including a normally open vent control valve, gas conduit means
entirely separate from said vent passage means whereby gas
pressure in said gas conduit means is unaffected by fluctuations
in vacuum in 8aid vent passage means resulting from variations
in the rate of flow of l~quid through said Venturi means and
adapted for ~ealed communication with the tank inlet opening,
a piston exposed directly to gas pressure conditions in said
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~ 0 49 9 8 3ga~ conduit means and arranged to c 108e said vent control
valve when gas pressure within the tank and said conduit means
exceeds a predetermined value, whereby when said port is sub-
merged or when such predetermined pressure condition~ occur
to close said vent control valve and thereby block said vent
passage means, said vacuum-responsive m~an~ becomes operative
to release said manually-operated means and thereby permit said
resilient means to close said main valve.
- In the accompanying drawings:
FIG. 1 is a side elevational view, partially in
section, of a nozzle e~bodying the invention.
FIG. 2 is an end view of the pressure-responsive
valve unit taken from line 2-2 of FIG. 1.
FIG. 3 is an exploded diametral sectional view of
the pre~sure-re8ponsive valve unit taken along line 3-3 of
FIG. 2.
FIG. 4 is a top view of the pre~sure-responsive
valve unit.
The nozzle includes a body generally inticated at 1
and having an inlet 3 to which a fuel hose is connected, and
an outlet S communicating with a spout 7 insertible into a
tank T to be filled.
Within body 1, between inlet 3 and outlet 5, is a
main valve 9, bia~ed by spring 11 into sealing engagement with
its seat 13 a~d thereby preventing passag¢ of fuel from inlet
3 to outlet 5. Valve 9 i8 secured to the upper end of its
stem 15 which slides in body 1 and pro~ects downwardly from
valve 9 and an operating lever 17, fulcrumed at 19 on a
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plun~er 21 slidably mounted in body 1, engages the lower end
of 8tem lS 80 that upward pressure on lever 17 force8 ~alve 9
upwardly to open posl~ion, permitting the flow of fuel past it.
Below valve seat 13 a dow~wardly facing conical
valve seat 23 i8 ~ounted in body 1 and a mating frusto-conical
poppet valve 25 is slidably mounted on stem 15 and biased
upwardly into engagement with seat 23 by a spring 27 seated
on stem gulde sleeve 29.
In order to cau8e main valve 9 to clo~e automatically
under.certain conditions a ball latch tevice compri~ng an
enlarged chamber 31 i8 fsr~ed in body 1 ad~acent the upper end
of plunger 21 defining a peripheral shoulder 33 and the upper
end of plunger 21 is formed with a central axial bore 35
inter8ected by a transver8e bore 37 at the 8a~e height a~
~houlder 33. Balls 39 are normally seated in tran~verse bore
37 and pro~ect outwardly therefrom into engagement with
shoulder 33 to prevent downward movement of plunger 21. Balls
39 are normally positioned in thi8 l~tching position by the
thickened upper end portion of latch pin 41 which extends into
bore 35 and bears agai~st the balls. Latch pin 41 i8 secured
to a diaphragm 43 unted in a chamber 45 formed by a cap 47
removably.secured to body 1 and a spring 49 seated against cap
47 biases diaphragm 43 and latch pin 41 downwardly into latch-
ing engagement with ball~ 39.
For providing vacuum to.chamber 45 to release latch
pin 41 a ~hort pas~age 51 extends fro~ diaphragm chamber 45
to an annular groove 53 in body l surrounding poppet val~e ~eat
23 and a radial p~ssageway 55 through the latter connects the
neck of seat 23 to annular groove 53.
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With the de8cribed arrangement, when lever 17 i8
pressed upwardly to open ~aln valve 9, fulcrum 19 reMalns
stationary beceuse b~lls 39 prevent dowmward ~ovement of
plunger 21. Pressuriz-d fuel passing valve 9 un~eats poppet
val~e 25 and a venturi effect i8 formed between poppet valve
25 and its ~eat 23, creating a vacuum in groove 53, pa~8age 51
and diaphragm chamber 45, whlch tends to rai~e the diaphragm
against spring 49, and with it, latch pin 41 ~o that its
thinner Lower portion per~lts radlal inward movement of balls
39 clear of shoulders 33, and consequent townward movement
of plunger 21 to relea~e lever 17 and per~it valve 8tem 15
and with it valve 9 to lower again3t seat 13 under pressure
of spring 11.
; Normally diaphragm chamber 45 i8 vented to atmosphere
by a passage 57 in nozzle body 1 which commNnicstes with a
vent tube 59 within 8pout 7, terminating in a port 61 near
the mouth of the spout 80 that, as long a~ passage 57 and
tube 59 are open, the vacuum in chamber 45 will be broken and
diaphragm 43 will not release balls 37 ~o permit downward
: 20 movement of plunger 21 and consequent automatic closure of
. main valve 9.
If, however, the fuel level in tank T covers vent
tube port 60, to block admission of air to tube 59, the vacuum
in chamber 45 will cause diaphragm 43 to release balls 59 and
thereby cause the clo~ure of main valve 9, prevent$ng further
flow of fuel through the nozzle. For returning plunger 21
and lever fulcrum 19 to their normal operating positions, a
coil spring 56 is seated at its lower end against body 1 and
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engages a downwardly facing ~houlder 58 on plunger 21.
For naking di~phragm 43 responsive to vacuum to
shut valve 9 except when the 8pout i8 inserted in a tank to
be filled, and al~o when higher than predetermined vapor
pressure occur8 in tank T, a self-contained valve unit generally
indicated at 61 is interposed betweon nozzle body outlet 5 and
~pout 7. Unit 61 comprises a tubular passageway portion 63
having external threads 64 at one end for securement to body
outlet 5 and internal thread8 65 at it8 other end for attach-
ment of spout 7.
A radial strut 69 supports a central tubular element
71 in tubular passageway portion 63, for connection, at its
opposite ends, to body passage 57 and vent tube 59, 80 as to
provide a continuous vent pa~sage from diaphragm chamber 45
to port 60.
At its top unit 61 i8 formed with a hollow circular
boss defining a circular chamber 75 normal to the axis of
tubular pas~age 63, and a cylindrical bore 77, through a
radial strut 69, connects chamber 75 with the hollow interior
20 of tubular element 71. A gate valve 81 i8 slidably unted in
bore 77 and is formed with a disc-shaped piston 85 on it8
outer end, slidably received in circular chamber 75. An
expanslble retaining ring 87 received in an annular groove 89
in the wall of chamber 75 limits the outward movement of
piston 85 and retains it in chamber 75. Near its inner end,
. cha~ber 75 is formed with an annular shoulder 91 against which
a ~ealing disc 93 of elastomeric material i8 seated, di8c 93
being centrally apertured at 95 to permit the passage there-
through of valve 81. A coil spring 97 seated against sealing
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disc 93 biases piston 85 outwardly to urge valve 81 tow~rd
open piston, clear of the pa88age through tubular ele~ent 71,
and also maintains ~ealing disc 93 seated agalnst shoulder
91. To eliminate resistance to inward movement of piston
85 resulting from compression of air confined in chamber 75,
-: a small vent opening 98 i8 formed in it8 wall 73.
For applying vapor pressure from tank T to pi8ton
85, a generally circular B leeve 99, of substantially greater
diameter than ~pout 7, 8urrounds valve unit 61 and the
ad~acent portion of spout 7 and is sealingly secured at one
end to nozzle outlet 5 and at its other end unts a sealing
't ring 101 of relatively 80ft ela8tomeric material engageable
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with the inlet of tank T to effect a seal therewith. Sleeve
99 i8 of bellows configuration, the tendency of the bellows to
expand axially biasing ring 101 outwardly into sealing engage-
! ment with the inlet of tank T. The central opening 103 in
ring 101 is of sufficiently larger diameter than spout 7 to
permit the free passage of vapor therethrough from tank T to
the region of valve unit 61, but sufficiently ~mall that the
. 20 lnner margin of ring lOl eng-ges retaining collar 105 on
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~ ~pout 7.
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When vapor pressure in tank T and ~leeve 99 exceeds
a predetermined value, in excess of the pressure exerted by
sprine 97 on pi8ton 85, it forces piston 85 and valve 81
inwardlyj causing the latter to block passage 72 through
tubular element 71, thereby blocking the vent~g of diaphragm
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i chamber 45 and permi~ting vacuum from poppet valve seat 23 to
raise diaphragm 43 and latch pi~ 41, releasing plunger 21 and
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pressure of lever 17 on n~in valve stem 15, to permit valve
~pring 11 to clo8e main valve 9 and thereby shut off the flow
of fuel through the nozzle. As 800n as pressure within
sleeve 99 i~ reduced, as by withdraw~l of 8pout 59 from tank
T, ~pring 97 urges piston 85 outwardly, to withdraw valve 81
from passage 72, thu~ venting diaphragm cha~ber 45 to
at sphere and breaking the vacuum therein to return latch
pin 41 to its normal position wherein balls 33 are held in
latching engagement with shoulder 33 to retain plunger 21 and
lever fuLcrum l9:i~ their normal positlons.
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