U.S. patent number 3,921,682 [Application Number 05/358,762] was granted by the patent office on 1975-11-25 for automatic fuel dispensing nozzle.
This patent grant is currently assigned to Texaco Inc.. Invention is credited to Edward A. Mayer, Dean C. McGahey, Eugene W. Vest.
United States Patent |
3,921,682 |
McGahey , et al. |
November 25, 1975 |
Automatic fuel dispensing nozzle
Abstract
An automatically operating fuel dispensing nozzle adapted to
function within a sealed fuel system. In particular a signal system
incorporated within said nozzle which functions to permit a
topping-off operation for filling a fuel tank, or for automatically
discontinuing a filling operation in response to an excessive
pressure which might build up within the fuel tank or other parts
of the closed system.
Inventors: |
McGahey; Dean C. (Fishkill,
NY), Vest; Eugene W. (Wappingers Falls, NY), Mayer;
Edward A. (Newburgh, NY) |
Assignee: |
Texaco Inc. (New York,
NY)
|
Family
ID: |
23410935 |
Appl.
No.: |
05/358,762 |
Filed: |
May 9, 1973 |
Current U.S.
Class: |
141/128 |
Current CPC
Class: |
B67D
7/48 (20130101) |
Current International
Class: |
B67D
5/373 (20060101); B67D 5/37 (20060101); B65B
003/26 (); B67D 005/373 () |
Field of
Search: |
;141/40,41,46,52,102,128,198,206-229,302,392 ;251/14 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Aegerter; Richard E.
Assistant Examiner: Schmidt; Frederick R.
Attorney, Agent or Firm: Whaley; T. H. Ries; C. G. Burns;
Robert B.
Claims
We claim:
1. An automatic fuel dispensing nozzle communicated with a source
of fuel, said nozzle having a spout (17) adapted to engage a fuel
tank filler tube (28) thereby to form said nozzle, fuel tank and
fuel source into a closed fuel system; a fuel conduit (13) in said
nozzle, main (16) and secondary (14) flow control valves positioned
in said conduit (13), an actuating arm (21) operably connected to
said main (16) and secondary (14) flow control valves respectively,
and being movable to adjust and lock said respective flow control
valves (14 and 16) in an open position to permit a rapid fuel flow
through said nozzle to said fuel tank, first valve release means
(19) connected to said secondary flow control valve (14), being
operable to automatically adjust the latter to a closed position in
response to a vacuum condition created at said nozzle spout by a
rise of fuel in the latter thereby adjusting said rapid fuel flow
to a slower, topping-off fuel flow, second valve release means (22)
connected to said main flow control valve (16), being operable to
automatically adjust the latter to a fully closed position in
response to a second occurring vacuum condition at said spout in
response to the rise of fuel in the latter, whereby to achieve
complete shut off of fuel flow through said nozzle, and pressure
sensing means including a sensing passage (29) opening into said
spout, and communicating the latter with said first and second
valve release means (19) and (22) respectively, said sensing
passage (29) including a selector valve (23) operable when in the
open position during said topping-off fuel flow to communicate said
second valve release means (22) with said nozzle spout (17),
whereby to actuate said second valve release means to close said
main valve (14) in response to a vacuum condition at said spout
(17), and being further operable when in the closed position during
said rapid fuel flow, to be adjusted to an open position in
response to an excessive pressure at said nozzle (17) caused by a
pressure accumulation in said fuel tank during the filling
operation whereby to actuate said second valve release means to
close said main valve and discontinue fuel flow to said tank.
2. A fuel dispensing nozzle as defined in claim 1, wherein said
selector valve (23) includes spring means in said selector valve
positioned to hold said selector valve in the closed position and
yieldable to permit opening of said selector valve in response to a
predetermined pressure exerted on said selector valve.
Description
BACKGROUND OF THE INVENTION
In the ordinary filling of a fuel tank by means of a nozzle
attached to a fuel source, the nozzle is usually provided with
means for automatically discontinuing flow when the tank becomes
filled. This is achieved without the attention of an attendant to
monitor the operation.
In the usual arrangement, the fuel dispensing nozzle is provided
with means to sense the surge and rising of the fuel level within a
fuel tank filler spout. At such time as fuel initially covers the
sensing means a vacuum signal established in the fuel path is
utilized to adjust the nozzles's flow control valves.
In one form of nozzle this initial vacuum signal will cause the
main fuel flow control valve to be released thereby completely
discontinuing flow of fuel to the tank. However, an improvement on
this type of nozzle includes the feature for reducing the fuel flow
upon reception of the initial vacuum signal. At the reduced flow
rate, the tank will continue to be filled or topped off to a
predetermined level, at which time a second vacuum signal will be
transmitted. This second signal will then further adjust the
control valves to completely shut off fuel flow.
In an attempt to reduce the amount of fuel vapor discharged into
the atmosphere during a refueling operation, means have been
devised for collecting or retaining such fumes during the
operation. One such means includes the use of a closed fuel system
such that the latter is not actually communicated with the
atmosphere. However, in lieu of the fuel vapors being discharged
into the air, they are collected either through the dispensing
nozzle or through ancillary equipment. In either instance, the
collected fumes are treated, or more preferably returned to the
storage tank after being condensed into liquid form.
To properly function in such a closed system, a fuel dispensing
nozzle must be designed such that it will not only shut off under
full tank conditions, but will automatically discontinue operation
when a malfunction occurs in the system. The latter shut off is
effective particularly in preventing an internal pressure build-up.
In brief, should the means for drawing or venting off the vaporous
fumes become inoperative, the possibility exists that a sudden
pressure build-up within the system could precipitate a dangerous
circumstance.
In the instant dispensing nozzle, valve means is provided for
automatically regulating fuel flow in response to conditions within
the fuel receiving tank. A sensing system embodied in the nozzle
signals the regulatory mechanism to provide a topping-off fuel
flow, a final shut off, and also an emergency shut off in response
to an excessive pressure build-up.
A fuel nozzle embodying the above mentioned features for
automatically providing the basic fuel tank topping-off, as well as
shut off operation, is shown in U.S. Pat. No. 3,688,813. In said
patent the manually operated dispensing nozzle includes a primary
or main flow valve together with a secondary valve. A vacuum
sensing means incorporated into the nozzle includes a conduit
disposed within the nozzle spout and communicated with a valve
release mechanism. The latter is in turn connected to the
respective valves to adjust their settings.
A manually actuated flow control lever is connected likewise to the
valve release mechanism which, upon actuation, will cause the flow
control lever to assume a neutral position thereby completely
shutting off the flow of fuel through the nozzle. To illustrate the
invention, the instant sensing and control arrangement will be
illustrated into the above noted fuel nozzle of U.S. Pat. No.
3,688,813.
In accordance with the present invention, means is provided within
the signal sensing system, such that the manual actuating lever
will be released to discontinue fuel flow through the nozzle in
spite of the conditions of the other flow control mechanisms.
Further, this event will occur so long as there is a predetermined
pressure build-up within the closed fuel system.
DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 represents a schematic flow diagram of the elements
incorporated into the instant fuel dispensing nozzle.
FIG. 2 is a side elevation of the nozzle which embodies the herein
disclosed features.
FIG. 3 constitutes a front elevation view of the nozzle as shown in
FIG. 2, the portion of the center housing being broken away to show
the internal structure.
FIG. 4 is a sectional view taken centrally through the nozzle along
the line 4--4 in FIG. 3.
FIGS. 5 and 6 are detailed sectional views substantially identical
with those of FIG. 4, but showing the internal parts in different
operating positions.
FIG. 7 is a sectional view taken along line 7--7 of FIG. 3.
FIG. 8 is similar to FIG. 7.
FIG. 9 is a detailed sectional view taken along the line 9--9 of
FIG. 7.
FIG. 10 is a segmentary view in cross section taken along line
10--10 of FIG. 4.
FIG. 11 is a segmentary view in cross section taken along line
11--11 of FIG. 4.
FIG. 12 is a segmentary sectional view taken along line 12--12 of
FIG. 8.
FIG. 13 is a segmentary view in cross section similar to FIGS. 5
and 6.
GENERAL STRUCTURE
FIG. 1 illustrates diagrammatically a schematic arrangement of the
present nozzle including the various valves and their relationship
whereby they interfunction to provide the desired flow
characteristics. As shown, nozzle body 10 comprises a fuel inlet
means 11 which connects to a pressurized source of fuel through a
flexible conduit 12. A main fuel passage 13 communicates said
conduit 12 with a supplementary flow control valve 14.
Fuel flow through the nozzle in accordance with the operation of
said valve 14, is conducted through a main flow control valve 16
and thence to the nozzle spout 17. In the alternative, flow will be
directed around said supplementary control valve 14, into a
diverter valve 18 and thereafter passed to the main flow control
valve 16 and to nozzle spout 17.
Each of said valves 14 and 16 is operably connected to a first
release mechanism 19 comprising in essence a closed chamber
provided with a movable diaphragm. Similarly, a nozzle actuating
lever 21 is operably connected with a second release mechanism 22
whereby reception of a signal from the nozzle spout 17 will cause
the respective valves to be closed.
The signal mechanism embodied in the nozzle comprises in brief a
signal selector valve 23 adapted to selectively transmit a signal
to one of the release mechanims 19 or 22. Further, said signal
selector valve 23 is provided with an overriding mechanism, to be
herein more fully described, to permit the flow of fuel to be
discontinued through the nozzle at such time as an excessive
pressure is realized within the fuel system into which the nozzle
is sealably coupled.
Referring to FIG. 2, the nozzle structure is characterized by a
cast housing or body 10 having a handle inlet 11 which receives
fuel from a pressurized source by way of hose or conduit 12.
Supplementary valve 14, and main valve 16 to be herein described
more fully, are disposed within the main portion of housing 10 and
are actuated by hand lever 21 acting on elongated valve stem end
24.
Lever 21 is pivoted on the lower end of a lock-out plunger 26, the
lever is latched in the maximum operative position shown in FIG. 2,
or in an alternate position, by a spring biased latch 27. Spout 17
extending from one end of body 10 is adapted to extend into inlet
pipe 28 of a fuel tank.
Externally, spout 17 is provided with an appropriate sealing
mechanism 31 to permit the nozzle to removably engage inlet pipe
28. Said seal mechanism 31 can be of the resilient collar type
adapted to slidably fit within pipe 28, or it can merely engage the
pipe 28 outer lip. Alternatively the seal member can be
controllably expandable to form an annular fluid barrier with the
pipe at such time as the nozzle is inserted therein.
Spout 17 is further provided internally with a venting means which
comprises a portion of the signal system. Vent tube 127 extending
along spout 17, is communicated with the nozzle main fuel passage
whereby a flow of fuel through a constriction 106 will create a
source of vacuum which is normally vented.
When, during a filling operation fuel rises about and enters
orifice 29, the vacuum sharply rises. In the conventional automatic
nozzle control system, said vacuum signal will be directed to, and
actuate the diaphragm of the first release mechanism 19 to in turn
adjust supplementary valve 14.
Further in the conventional system, selective valve 23 will be
actuated to redirect any further vacuum signal onto the diaphragm
of the lever release mechanism 22. Thus, upon the event of fuel
again rising in filler pipe 28 a second vacuum signal will cause
lever release mechanism 22 to be adjusted and free lever 21 thereby
closing main flow valve 16.
FIG. 4 of the drawings illustrates the interior of the instant
nozzle in cross section, with the various valves set to permit
maximum flow fuel to a tank being refilled. The body of the nozzle
is provided with interior cavities and passages to define the
respective fuel flow passage as well as to accomodate the various
operable elements therein.
Valves 14 and 16 as shown are mounted to operate along a common
axis. Valve 16 includes a movable element 33 having a lower surface
adapted to engage a circular seat 34 when in the closed position,
and to be spaced from said seat in the open position. When in the
latter position, fuel flows into lower chamber 36 and thence to
nozzle spout 17.
Said moving element 33 is positioned on a lower stem 37, the latter
being slidably mounted in body 10 for reciprocal movement
therethrough and registered in circular sealing ring 38.
Movable element 33 includes a central cavity in the upper end
adapted to slidably receive a downwardly depending upper stem 39
from a cage 41. Said cage 41 includes a center longitudinal bore
having a sufficient opening diameter to slidably receive the guide
portion of a locking pin 42 and encloses spherical balls 43.
The latter are disposed coaxially with the respective valves 14 and
16, and function to lock said valves in the open position at such
time as actuating lever 21 is set to provide maximum fuel flow
through the nozzle.
Valve 14 comprises a sliding member 46 having a peripheral seating
surface which is movable to engage ring seat 47 to close the valve.
A compression spring 48 disposed between the respective members 33
and 46 maintains a separating force therebetween.
The plurality of spherical balls 43 held within cage 41 bear
against the shallow conical segment of locking pin 42. When, as
shown in FIG. 4, the latter is in the downward position, said balls
are urged outwardly and engage peripheral shoulder 49. Compression
spring 50 is mounted externally of cage 41, bearing against a wall
of body 10 to normally urge valve 14 into the downward or closed
position against seat 47.
The upper end of valve 14 is provided with an outwardly radiating
heat 52 adapted to slidably fit within cavity 53. A trip lever 54
is positioned adjacent to said cavity 53 and includes an outward
projecting portion positioned to engage the edge of head 52 when
the latter enters cavity 53.
The upper end of locking pin 42 is slidably received in cylindrical
sleeve 51, which is a part of valve 14, and further carries a
retaining plate 56 having a relatively smooth outer edge to engage
diaphragm 57. The latter is peripherally fastened along a shoulder
of the body wall and receives a cap 58 which is fixed in position
to clamp diaphragm 57 and form chamber 59. A spring 61 carried
within chamber 59 on the upper side of diaphragm 57, bears against
the spring retainer plate 56, urging the locking pin 42 into a
normally downward position.
As above mentioned, with respect to FIG. 4, valves 14 and 16 are
both shown in the open position to permit maximum flow through the
nozzle. In such an instance lower stem 37 is urged upwardly by
actuating lever 21.
At the reception of a first signal from the nozzle signal sensing
means, the vacuum or reduced pressure signal is sent to chamber 59
of release mechanism 19. Signal selector valve 23 is closed,
thereby preventing the signal from reaching chamber 96 of release
mechanism 22. Because of the pressure differential thereby affected
across diaphragm 57, the latter will be displaced in an upward
direction against the force of spring 61. The consequent withdrawal
of locking pin 42 by diaphragm 57 will thus permit the respective
balls 43 to fall inwardly into a non-locking position thereby
permitting valve 14 to close and in effect blocking a segment of
the fuel flow passage.
Diverter valve 18 is positioned adjacent valve 14. Said valve 18
includes a movable valve stem 66. Said element 66 as shown,
includes a center shank together with a spring 67 mounted thereon
to normally bias said valve into a closed position against
peripheral seating ring 68.
Valve 18 includes an actuating mechanism 69 including cap 71 formed
across the valve defining a chamber 72. The latter is provided with
a diaphragm 73 together with a reinforcing plate 74 against which a
positioning spring 76 acts. Said spring 76 engages a wall of body
10 and normally urges diaphragm 73 into a displaced position when
valve 14 is open and the pressure gradient across said valve is in
effect zero, such that the diverter valve 18 is normally
closed.
A by-pass connection 111 communicates chamber 72 with the main fuel
flow passage. Thus, with valve 14 in the closed position, fuel flow
will proceed through said connecting passage 111 and enters chamber
72. The fuel pressure difference across diaphragm 73 acting against
the outer side of the diaphragm, will open diverter valve 18.
Thereafter, valve 18 is communicated with the main fuel passage 13
thus permitting fuel to be metered through valve 18 or be metered
through adjacent constricted passage 78 to valve 16.
The fuel stream has thus in effect been passed around the closed
supplementary valve 14, and its flow throttled to a minimum by
passage through the restricted opening of diverter valve 18 and
passage 78. This minimum flow is continued during the topping-off
period of a filling operation. Further, said flow continues until
such time as a second signal is registered in the signal sensing
means to completely discontinue flow through the nozzle by closing
valve 16.
Release mechanism 22 functions to displace lever 21 and permit
valve 16 to adjust to a closed position. Said mechanism 22
comprises a lock-out plunger 26 which is slidably mounted within
body 10 and connected at its lower end at a pivotal joint 82 to
lever 21. Said plunger is biased by spring 83 normally into an
upward position.
Plunger 26 includes a center passage adapted to slidably receive
locking pin 84. The latter includes a substantially cylindrical
locking surface 86 having tapered or conical segments 87 and 88
immediately adjacent thereto. A series of balls 89 held within a
cage section of lock-out plunger 26 functions to establish the
retracted position of the latter when locking pin 84 is as shown in
FIG. 4. Thus, the respective balls 89 are outwardly urged into
contact with shoulder 91 by locking surface 86.
Lever release mechanism 22 will maintain plunger 26 in the
retracted position shown so long as the pressure differential
across the diaphragm 92 remains constant. A cap 93 clamps the
periphery of diaphragm 92 in place to define closed chamber 96.
Said diaphragm 92 is acted upon by oppositely positioned retainer
plates 97 and 98, which retain upper and lower balancing springs 99
and 101 respectively.
At such time as a second vacuum signal is registered in the nozzle
spout 17 by fuel rising in the latter, said signal will be directed
through signal selector valve 23 and passage 127 to chamber 96.
With this differential pressure across diaphragm 92, the latter
will be drawn upwardly into chamber 96 thereby simultaneously
drawing locking pin 84 upwardly, permitting the respective
spherical balls 89 to move inwardly and release locking plunger 26,
as shown on FIG. 6. The latter will therefore be free to act under
the urging of spring 48 to move downwardly and concurrently release
valve 16 to engage sealing seat 34. This action will terminate all
fuel flow through the nozzle.
Referring to FIG. 13, in the instance of a positive pressure
build-up within the closed fuel system, said pressure, rather than
a vacuum will be transmitted to diaphragm 92. The latter will
therefore be depressed downwardly into chamber 102 such that balls
89 will engage tapered surface 87. As in the above instance, said
balls will move inwardly thus permitting lock-out plunger 26 to be
urged downwardly by spring 48.
Signaling System
Referring to FIGS. 1 and 4, the nozzle signaling system comprises,
as noted, a network of conduits adapted to transmit either a
vacuum, or a positive pressure signal whereby to control fuel flow.
Line 105 of said signal system is communicated with constricted
annulus 106 which in turn, guides the mian flow to nozzle spout 17.
Said line 105 is communicated with vent tube 107 and orifice 29
such that normally, annulus 106 and orifice 29 are vented to the
fuel tank interior. Thus, as fuel flows through the constricted
annulus 106 the reduced pressure or vacuum created by the fuel flow
will be vented into the fuel tank.
Line 105 is further communicated with passages 107 and 109, and
thence to actuating mechanism 19. Since the vacuum will normally be
vented by way of orifice 29, diaphragm 57 in chamber 59 will
maintain a neutral position.
However, as fuel rises at a rapid rate in tube 28 to eventually
fill the orifice 29, the vacuum created will be transmitted to
chamber 59. The resulting pressure differential across diaphragm 57
will cause the latter to be drawn upwardly into said chamber, as
shown in FIg. 5, thereby drawing locking pin 42 upwardly. With said
movement, spherical balls 43 will be displaced inwardly thus
releasing cage 41 to permit valve 14 to close under the influence
of spring 50.
Topping-Off Flow
Referring to FIGS. 5 and 6, with valve 14 closed, the pressure in
fuel passage 13 will be transmitted by way of passage 111 to
chamber 72. Said fuel pressure acting against diaphragm 73 will
displace the latter inwardly thereby displacing valve 18 from its
seat 68.
Fuel flow through valve 18 will then enter constricted passage 78
which is in turn communicated with compartment 112. Thereafter the
throttled or topping-off fuel stream will continue through open
valve 16 and to nozzle 17.
With the downward actuation of valve 14 to the closed position, the
outer edge of head 52 will contact and rotate trip lever 54. The
latter is fixedly mounted to rotatable shaft 117. Tab 118 also
carried on shaft 117 slidingly engages center plunger 119 of valve
23 to form an overriding mechanism to the latter.
Referring to FIG. 12, valve 23 includes plunger 119 which is
slidably guided at one end in vented bushing 121 and diaphragm 123
to form a vapor tight sliding seal therewith. The opposite end of
plunger 119 opens into chamber 122. Said plunger opposite end
includes a flexible diaphragm 123, the periphery of which is
sealably fixed to the walls of chamber 122 thus permitting
reciprocatory movement of plunger 119 therethrough. A spring 125 on
plunger 119 biases the latter to in effect maintain valve 23 in the
closed position.
A resilient ring 124 carried on plunger 119 adjacent to diaphragm
123, cooperates with seat 126 to form a sealing engagement with the
latter (FIG. 7), or to be displaced therefrom (FIG. 8) to
communicate passage 107 with passage 127 and thence with release
lever mechanism 22.
During the initial or rapid filling flow to the fuel tank, valve 23
will be closed (FIG. 7) so that there is no communication between
passages 107 and 127. However, with the closing valve 14 for the
low velocity topping-off operation valve 23 will be longitudinally
shifted as above noted to the open position shown in FIG. 8.
The latter valve adjustment is achieved by engagement of downwardly
moving head 52 to contact lever 54, thereby rotating the shaft 117
and thus withdraw diaphragm 123 from contact with its mating
seating surface 126.
In accordance with the invention, an excessive pressure will
normally build up within the fuel tank being filled during the
period of the preliminary filling operation. Thus, main valve 16
and supplementary valve 14 will initially be in the open position.
At this time selector valve 23 is closed.
Since it is desirable to immediately discontinue flow by way of
main valve 16 when a predetermined positive pressure is reached in
the closed system, valve 23 is so designed to override the closing
force exerted by spring 125, and go to an open position by the
pressure differential across diaphragm 123.
In brief, a predetermined pressure build-up within the fuel system
will be detected first at orifice 29. Said pressure will be
transmitted by way of passage 107 to chamber 122 whereby to actuate
the lever release mechanism of chamber 22.
The diameter of diaphragm 123 is thus of sufficient size such that
the force exerted thereon by the pressure within the closed fuel
system will be adequate to overcome the opposing force of spring
125. Thus, the diaphragm and valve will be displaced into the open
position as shown in FIG. 8, in response to the pressure
build-up.
Said pressure will then be communicated directly by way of passage
127 to chamber 96. In the latter the positive pressure acting
against diaphragm 92 causes the latter, as well as locking pin 84,
to move downwardly. As the respective balls 89 pass from surface 86
to conical surface 87 they move radially inward thereby releasing
plunger 26 to its lower position.
Release of the plunger in turn permits the lever valve stem to be
similarly released such that spring 48 will urge valve 16 into the
closed position in which this latter movement is achieved as noted
without consideration for the phase of the filling operation. That
is, the overriding closing action will be effected in the system
even though the nozzle be set to either maximum flow or topping
flow conditions.
Other modifications and variations of the invention as hereinbefore
set forth may be made without departing from the spirit and scope
thereof, and therefore, only such limitations should be imposed as
are indicated in the appended claims.
* * * * *