Abstract:
A safety breakaway connector begins with a body that receives a cooperating insert providing a coaxial flow path. The body has threads, a collar leading to an extension, and a hollow interior. The insert also has threads, a collar that leads to an inner wall, and a hollow interior. The inner wall fits snugly within the extension of the body. Generally, the insert simply slides into and interconnects with the body for quick installation. Two spaced apart biased check valves remain slightly outwardly from the narrow portions of the body and insert. A guard covers the body. Upon the application of the minimum force, the insert separates from the body, and the check valves abruptly close preventing further leakage of fuel. Alternatively, a strategically located O-ring or gasket seals the various components and withstands pressure variations.

Description:
CROSS-REFERENCE TO RELATED PATENTS 
       [0001]    This provisional application claims priority to the pending application Ser. No. 12/381,922 with a filing date of Mar. 18, 2009 now pending which claimed priority to the non-provisional application Ser. No. 11/503,562 filed on Aug. 11, 2006 now patented as U.S. Pat. No. 7,575,023 and all are owned by a common assignee. 
         [0002]    The subject matter of this application is related to the subject matter of the patents of Arthur C. Fink, Jr. and Thomas O. Mitchell, pertaining to Breakaway Concentric Hose Connector, now U.S. Pat. No. 5,365,973, Breakaway Hose Connector now U.S. Pat. No. 4,827,977, and Butterfly Valve for Fluid Flow Line, now U.S. Pat. No. 4,667,883, and owned by a common assignee. 
     
    
     BACKGROUND OF THE INVENTION 
       [0003]    This single seal breakaway connector relates in general to means for allowing fuel to flow through a line but abruptly stopping fuel passage through the line upon application of sufficient axial force. Such axial force often arises when an errant motorist drives away from a fuel pump. The connector sees use in a flow line, such as a gasoline line connecting to a nozzle used by motorists for fuel dispensing at a service station. The connector more specifically relates to improvements within it useful for installing upon coaxial hoses, fittings, and nozzles and later when a severance occurs along the line and when a loss of fuel may be encountered, such as when a vehicle drives off with the nozzle inadvertently still inserted within the vehicle fuel tank. Unique aspects of the present connector are a smooth exterior between its two halves, faces suitable for gripping by a wrench or other tool, and a flow constriction interior of the check valves. This invention is especially useful when applied in a fuel line at its connection to a pump, at a splice of two lines, or proximate a nozzle and it functions as a check valve to prevent fuel flow under emergency adverse conditions, particularly when the breakaway hose is disconnected. 
         [0004]    Numerous connectors and valves in the prior art furnish a shut-off of fluid or other fuel flow, and more particularly, such mechanisms normally are utilized in lines where fuel may be flowing, and generally in those situations when the conduit comprises the fuel line leading from a fuel dispenser to its nozzle. For example, as can be seen in the U.S. Pat. No. 2,642,297, to Hanna, a breakaway coupling responds to tension in the line and is held together through a combination of male and female couplings, and detents that provide bearing engagement between the two components. In addition, the U.S. Pat. Nos. 4,617,975, and 4,691,941, to Rabushka, discloses various types of tension actuated uncouplers, for delivering gasoline to a vehicle from a gas pump. These prior patents portray devices that tend to leak, and when any internal pressure is exerted within the fuel line, such as may occur when pumping the fuel, excessive pressures may momentarily arise within the fuel line, and particularly at the location of the uncoupler, and in some instances, has actually forced the coupling device to prematurely come apart. These devices also require separation of their components by force oriented axially. 
         [0005]    Existing fuel nozzles have a tip inserted into the vehicle fuel tank connected to valving and a handle opposite the tip as is commonly known. A fuel line connects to the handle generally collinear with the tip. Occasionally, careless motorists presume the fueling has finished or hear the nozzle click off and drive away from the pump with the nozzle still inserted in the filler neck of the vehicle fuel tank. 
         [0006]    When the motorist drives the vehicle away, the nozzle moves with the vehicle and the fuel line extends and becomes taught between the nozzle and the pump. Once the fuel line becomes taught, a fortunate motorist may have the nozzle slip out of the filler neck and fall to the surface of the dispensing facility. More often, the taught fuel line causes the nozzle to bend, generally at the tip near the filler neck and the fuel line to strain its joint to the handle. A motorist that drives away abruptly or at high speed will rapidly damage the nozzle, the vehicle, and likely separate the fuel line from the nozzle. Most dispensing stations have a breakaway connector locating near where the fuel line connects to the pump. However, when a fuel line separates from the nozzle, existing breakaway connectors do not retain the fuel located in the line between the breakaway connector and the nozzle. In a drive away incident, the fuel remaining within the fuel line spills and becomes an environmental hazard. The dispensing facility then has a broken nozzle, separated hose, and a spill to clean up. 
         [0007]    This predicament has generally been recognized by the Applicant as primarily occurring because flow lines lack the ability to rotate or to pivot into an orientation parallel to the direction of travel of a vehicle driving off from a pump. Further, flow lines lack a lightweight and compact breakaway connector capable of locating proximate the handle of a nozzle. 
         [0008]    Additionally, prior art breakaway couplings may have unbalanced internal forces. In a drive off, greater fluid forces are exerted in one direction upon one part of the breakaway coupling than upon the other, and are inherent because of the construction of the breakaway coupling device. When spontaneous and unbalanced high pressures are encountered, the pressure exerted upon one component of the breakaway coupling device in one direction, substantially differs from the fluid pressure that may be exerted upon the other component of the breakaway coupling device, and therefore, this pressure disparity tends to force the coupler to prematurely separate, in an untimely and dangerous fashion. This can and has occurred particularly where the fluid pressure in the hose may undergo a phenomenon that is equivalent to “water hammer.” 
         [0009]    However, the present invention includes a smooth exterior, lightweight compact connector that connects flow line near the handle of a nozzle. Further, the connector induces forces to balance the internal forces applied against the main O ring seal, check valves, and separating pin. The main O ring seal endures fluid forces applied from fuel flowing through the invention. The two piece construction and shear pin construction provides counter forces that balance the fluid forces. Generally, the fluid forces tend to urge the connector apart while the forces induced by the present invention are equal in magnitude but opposite in direction to the fluid forces on the main O ring seal. The present invention neutralizes the fluid forces, minimizes nuisance breaks, stops fuel flow from a separated flow line, and minimizes handle damage. 
         [0010]    The lengths of hose, fittings, and nozzles require connection among themselves and to service station pumping facilities. Hoses, fittings, and nozzles have couplings, often near the pump, that breakaway when an errant motorist drives away with a hose in a vehicle, and thus prevent a spill or worse, a fiery catastrophe. Until a breakaway, a coupling joins two sections of a fueling line and permits passage of fuel therethrough. As fuel pumps through the flow line, pressure spikes significantly and substantially throughout the hose, momentarily, and even at the location of the coupling, as when the flow is suddenly stopped, as for example, when the fuel tank is full. Hence, leakage at such couplers has frequently occurred in the field, and on occasion, untimely separation of the coupling has happened. 
         [0011]    Couplings generally have two halves, a male fitting and a female fitting. The male fitting joins to a hose, fitting or nozzle and has an extended spacer means. The female fitting joins to a second hose, fitting, or nozzle and has a hollow cylindrical center to receive a spacer means. The female fitting engages the coupling by two diametrically opposed shear pins provided towards the rear of the female fitting and a plurality of locking bearings towards the front of the female fitting. Upon inserting the spacer means into the female fitting, the male fitting stands off from the female fitting until an errant motorist pulls the male fitting from the female fitting, the spacer or pin falls out, and the check valves close off the two pieces of hose formerly connected to the coupling. 
         [0012]    Within the fittings of the coupling and the shear pins, pressure rises and falls depending upon the fuel flow through the coupling. Prior art designs provided an empty space between the locking bearings and the shear pins to absorb pressure fluctuations. In use though, the “water hammer” like effects during fueling induced excessive pressure upon the shear pins which would break repeatedly even with proper fueling and nozzle handling by motorists. Such nuisance breaks occur often and service stations then have to close a pump temporarily while the existing coupling is replaced. 
       DESCRIPTION OF THE PRIOR ART 
       [0013]    Other patents that show various related uncoupling devices include the U.S. Pat. No. 4,449,545 to Vernor, disclosing a poppet valve having a conical surface that is disposed for seating upon a valve seat, when breakage occurs between the plug and socket of the shown valve. A great variety of other types of hose couplers are used in the art, as can be seen in the U.S. Pat. No. 2,777,716, to Gray, showing a socket type hose coupler with reciprocating detent. Another form of a quick disconnect coupler and safety check valve is shown in U.S. Pat. No. 4,060,219, to Crawford. The patent to Shames, U.S. Pat. No. 4,070,003 also discloses a coupler with automatic shut-off, but the sealing means provided therein has substantial size, and causes significant disruption to the normal flow of fluid through the coupler. Another type of valve assembly is shown in U.S. Pat. No. 4,307,744, to Morrison. An additional form of breakaway safety valve is shown in U.S. Pat. No. 4,064,889, to Gayle, wherein a ball valve prevents the discharge of gasoline vapors in a break. 
         [0014]    Other patents showing decoupling devices, for use in flow lines, are shown in the patent to Scheiwer, U.S. Pat. No. 2,536,702 discloses a coupling for use within a flow line, and incorporating the ball type coupling members. Pasker, U.S. Pat. No. 2,599,935 discloses a hydraulic line coupling. Wurmser, U.S. Pat. No. 2,631,872 discloses a quick coupling device for flow lines. Clark, in his U.S. Pat. No. 2,860,893 shows a ball detent type coupling with breakaway feature. Burning, U.S. Pat. No. 3,317,220, shows a releasable fluid coupling. Bolton, Jr., in U.S. Pat. No. 3,334,860 discloses a fluid coupling. Shendure, U.S. Pat. No. 3,715,099 discloses a valved quick-disconnect coupling. Silvana, in U.S. Pat. No. 3,918,679 discloses a universal coupling that allows a flow line to rotate about its longitudinal axis but not turn upwards of ninety degrees. Taylor, in his U.S. Pat. No. 4,098,438 discloses a gasoline spill prevention system. The patent to Morrison, U.S. Pat. No. 4,124,228 shows a pressure-balanced fluid coupling. The patent to Parrish, U.S. Pat. No. 4,392,513, shows a quick disconnect safety coupling. A similar type of coupling assembly is shown in the patent to Norton, et al., U.S. Pat. No. 3,836,114. Livingston, in U.S. Pat. No. 3,138,393 shows a coupling for substantially axially fixed conduits. Morrison, in U.S. Pat. No. 4,124,228 shows a pressure-balanced coupling. These are examples of various prior art breakaway coupling devices, primarily for use within a fluid flow line, and, some are of the breakaway type. 
         [0015]    Other patents that have issued to the Assignee of the patent application herein include the patent to Fink, Jr., U.S. Pat. No. 4,827,977, upon a Breakaway Hose Coupling, the patent to Fink, Jr., et al., U.S. Pat. No. 5,365,973, for a Breakaway Concentric Hose Coupling, the patent to Coates, II, et al., U.S. Pat. No. 6,182,695, shows a further Breakaway Coupling and Coupler Therefore, and finally, the patent to Coates, et al., U.S. Pat. No. 6,192,934, shows an additional improvement in Breakaway Concentric Hose Coupling. 
         [0016]    The difficulty in providing a single seal breakaway connector is also shown by the existing means to respond to nuisance breaks. Fuel line providers have added more shear pins to their coupling designs and locate their couplers near the pump rather than at the handle. The greater number of pins reduces the force absorbed by each pin. However, given enough cycles of fueling, the shear pins of greater number still fatigue and break unexpectedly. The variability in time to failure by fatigue leads to heavier and redundant coupling designs as the failure time defies accurate prediction. The coupler near the pump though permits fuel to escape from a hose that separates from the handle of a nozzle. 
         [0017]    The present art overcomes the limitations of the prior art. Where, the present invention, a single seal breakaway connector, uses three equiangular spaced shear pins through fittings, a smooth exterior surface, and a constricted flow path within the connector thus reducing the incidence of nuisance breaks. 
       SUMMARY OF THE INVENTION 
       [0018]    A safety breakaway connector begins with a body that receives a cooperating insert providing a coaxial flow path. The body has threads for connection to a hose or other fitting and a collar leading to an outer cylindrical wall. The body has a hollow interior that narrows opposite the threads. The insert also has threads for its connection to a hose or other fitting generally opposite that of the body. Inwardly from the threads, the insert has its collar that leads to an inner wall. The inner wall fits snugly within the outer wall of the body. The insert has a hollow interior that begins proximate the narrow portion of the body and widens to a constant diameter for the length of the body. Two spaced apart biased check valves remain slightly outwardly from the narrow portions of the body and insert. A guard covers the majority of the exterior of the body. Upon the application of the minimum force, the insert separates from the body, and the check valves abruptly close upon the narrow portions of the body and the insert preventing further leakage of fuel from their connect hoses or fittings. 
         [0019]    Generally, the insert simply slides into and interconnects with the body for quick installation. One strategically located O-ring provides for fluidic sealing of the various components and withstands pressure variations. The present invention utilizes compact, strong biasing springs, or other mechanism that provides for its simple installation and eventual prompt closing of the check valves during an emergency. 
         [0020]    This invention contemplates the formation of a single seal breakaway connector, of the type that may be used between two fuel lines, or hoses, and preferably a fuel line that conveys diesel exhaust fluid from a dispensing pump to and through a nozzle into a vehicle fuel tank. More preferably, this invention has been designed containing rather unique components that provide for and assure minimal turbulent flow through the check valves, a smooth exterior of the connector, and sealing with a single O-ring, and to prevent any leakage, or untimely disconnection from any internally generated forces, such as fluid flow or fluid spike pressures, that may spontaneously occur within the flow line, particularly when the flow of fuel suddenly stops. These features are primarily encountered when a vehicle drives away with the nozzle still in the filler neck and through balancing the internal forces created by fluid flow and static fluid pressure. The spring loaded check valves and shear pins balance the internal forces thus; the net force on the present invention dwindles to zero during pressure spikes. 
         [0021]    And, even if any forces generated within the connector are not sufficient to cause an untimely decoupling, such internal pressures, and their misdirected forces, at least have a tendency to cause an incipient partial separation, and enough of an opening within the connector that undesirable leakage will at least occur. Hence, this current invention is constructed containing designed components, fabricated into a particular configuration, so that forces of a moving vehicle and any internal forces generated by the fluids passing within the flow line and the connector, are equal to each other, in opposite directions, and therefore, do not affect any substantial and unequal forces within the connector, keep the forces upon the connector in balance and thereby prevent untimely disconnection, or leakage. 
         [0022]    Generally, as well known in the art, breakaway hose connectors are usually designed to provide separation when an errant driver pulls away from the dispensing facility pumps, with a gasoline nozzle and fuel line still connected within his vehicle&#39;s fuel tank. Under such a drive away situation, it is well documented that a nozzle starts to bend with its attached fuel line then abrupt disconnection of the fuel line at the nozzle occurs, and without the usage of some type of decoupling device, as explained in this current invention, fuel spills from the fuel line where it has separated from the nozzle until a breakaway connector ceases spillage of fuel upon the grounds of the service station, a very hazardous and disastrous predicament. Utilizing a breakaway connector of this invention, closes a fuel line abruptly that prevents and curtails further fuel flow from the fuel line where it separates from the nozzle, hose, or other fitting. 
         [0023]    In addition, when prior art decoupling devices are affixed on a fuel flow line in routine use, internal pressure spikes or water hammer are generated within the fuel lines. The enormous pressures that instantaneously arise can cause an untimely separation of the prior art decoupling devices, or even at least some undesirable fuel leakage. Hence, this current invention has been designed to prevent any untimely disconnection, because of internal fluid pressures, and even to avoid leakage, by shear pins, check valves, and coil springs that equalize the disparity of any pressures generated within the connector, and thereby prevent spiked pressures from acting upon the connector, and thereby prevent is untimely disconnection. 
         [0024]    These are conditions that can cause unwanted breakaway hose connector separations that result in equipment down time. In most instances, these nuisance breaks are caused by an immediate sudden build-up of pressure inside the fueling hose. A sudden pressure increase travels through the hose to the breakaway connector, and forces it apart. The sudden pressure build-up can occur when a nozzle abruptly shuts off while fueling under high volume or high pressure. The sudden accumulation of pressure in the fuel line can even cause the connector to separate. However, an even greater pressure can be created when a forced stretching of the hose constricts its internal diameter, as when being abusively used. 
         [0025]    The breakaway hose connector of this invention eliminates these nuisance breaks. The breakaway connector of this invention will still separate under routine usage and under a drive away situation, when a predetermined force is exerted upon it. And, when this detrimental condition is encountered, the connector separates as planned, thus preventing a disastrous fuel spill. But, as explained, the connector of this device has further been improved so as not to prematurely separate when subjected to internal line shock pressures, a condition that generally causes unnecessary connector breaks, in the prior art. 
         [0026]    In addition to the foregoing, the breakaway hose connector of this invention is one that quickly and easily disconnects after a drive away break. Upon breakage, the present connector becomes a minimal number of pieces and shrapnel ejected in the vicinity of the point of usage of the connector. Following a separation, the unit is replaced promptly for restoring a pump to operational status. 
         [0027]    Therefore, it is an object of the invention to provide a new and improved single seal breakaway connector for fuel nozzles and fuel lines. 
         [0028]    It is a further object of the present invention to place two hoses, two fittings, or a hose and a fitting, in line for the least turbulent flow of fuel. 
         [0029]    It is a further object of the present invention to provide a single seal breakaway connector that operates upon one sealing O ring. 
         [0030]    It is a further object of the present invention to provide a single seal breakaway connector that allows for grasping by a tool upon its center. 
         [0031]    It is a further object of the present invention to dissipate any abrupt pressure spikes generated within the a single seal breakaway connector during its functioning within a flow line thus preventing undesirable fuel leakage or untimely separation of hoses and fittings. 
         [0032]    It is a still further object of this invention to provide a single seal breakaway connector with internal features to isolate connected hoses and fittings from “water hammer” effects during fueling. 
         [0033]    Another object of this invention is to provide a single seal breakaway connector where its sealing O-rings and gaskets are normally located within seats and cooperating with threads respectively during normal and routine usage of the adaptor when installed within a fluid flow line. 
         [0034]    Another object is to provide such a single seal breakaway connector that is capable of connecting to a variety of hoses and fittings having female ends, threaded and unthreaded. 
         [0035]    Another object is to provide such a single seal breakaway connector that has a low cost of manufacturing so the purchasing people and organizations can readily buy the adaptor through stores and supply sources. 
         [0036]    These and other objects may become more apparent to those skilled in the art upon review of the invention as described herein, and upon undertaking a study of the description of its preferred embodiment, when viewed in conjunction with the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0037]    In referring to the drawings, 
           [0038]      FIG. 1  shows a top view of the single seal breakaway connector; 
           [0039]      FIG. 2  shows an end view of the present invention; 
           [0040]      FIG. 3  shows a sectional view through the connector with the body to the left; 
           [0041]      FIG. 4  describes a sectional view through the tip of the body; 
           [0042]      FIG. 5  shows a sectional view through the guard, the outer wall of the body, the inner wall of the insert, and a check valve; 
           [0043]      FIG. 6  shows a side view of the body; 
           [0044]      FIG. 7  illustrates a sectional view through the body; 
           [0045]      FIG. 8  describes an end view of the body with the collar in the background; 
           [0046]      FIG. 9  shows a side view of the insert generally opposite that of the body; 
           [0047]      FIG. 10  illustrates a sectional view through the insert; 
           [0048]      FIG. 11  describes an end view of the body with the collar in the background; 
           [0049]      FIG. 12  describes a top view of the O-ring and gasket for the alternate embodiments of the present invention; 
           [0050]      FIG. 13  shows a sectional view of the gasket; 
           [0051]      FIG. 14  shows a detailed view of the edge of the perimeter of the gasket; 
           [0052]      FIG. 15   a  provides a detailed view of an alternate embodiment of the edge of the perimeter of the gasket; 
           [0053]      FIG. 15   b  provides a detailed view of an alternate embodiment of the edge of the perimeter of the gasket; 
           [0054]      FIG. 15   c  provides a detailed view of an alternate embodiment of the edge of the perimeter of the gasket; and, 
           [0055]      FIG. 15   d  provides a detailed view of an alternate embodiment of the edge of the perimeter of the gasket. 
       
    
    
       [0056]    The same reference numerals refer to the same parts throughout the various figures. 
       DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0057]    The present invention  1  appears in  FIG. 1 , and has a generally hollow cylindrical form with a first end  2  and an opposite second end  3 . As shown both ends  2 ,  3 , have external threads  4  here shown as right hand, coarse. The threads continued for approximately four revolutions around the circumference of the ends. The threads extend inwardly upon a body  5  and an opposite insert  6 . The body and the insert are hollow and have sufficient length for a solid connection of the connector to a hose or other fitting. Inwardly, the body and the insert each have a notch upon its perimeter, a first notch  7  at the end of the threads  4  on the body, and a second notch  8  opposite the first notch where the threads  4  end on the insert  6  The notches  7 ,  8  have a lesser diameter than the threads  4  and the ends  2 ,  3 . Defining one side of each notch and opposite the threads, the body and the insert each have a collar. The body has a first collar  12  of a diameter noticeably greater than diameter of the threads. The collar has a thickness, along the length of the connector, suitable for gripping by a tool, such as a wrench or channel lock pliers. The collar extends around the circumference of the connector, that is, perpendicular to the length of the connector. The collar is generally round but for at least two faces  9   a.  The insert has a second collar  15  also of a diameter noticeably greater than diameter of the threads and generally the same diameter as the first collar for overall smoothness of the connector. This collar also has a thickness, and faces  9   a  suitable for gripping by a tool, such as a wrench or channel lock pliers. Shown generally between the collars  12 ,  15 , the connector has a guard  9  generally cylindrical in shape with one beveled end. The guard has its beveled end placed inwardly from the second collar  15  and the remainder of the guard fits snugly upon the exterior of the body  5 . As an alternate embodiment, the adaptor includes at least one O-ring  10  and at least one gasket  11 . The O-ring has a generally O shape as later shown in  FIG. 12  and a rounded is cross section. The gasket also has a generally rounded shape as shown later in  FIG. 12  but with a squared cross section. 
         [0058]    Turning the connector ninety degrees out of the plane of  FIG. 1 ,  FIG. 2  shows an end view of the connector. The connector has its guard  9  defining the outermost diameter of the invention. Inwardly from the guard  9 , the connector has a collar  12  generally round but for two mutually parallel faces  9   a  suitable for gripping by a tool. The collar has a generally flat surface that merges with a notch  7 . Inwardly from the faces and outwardly from the notches, the body  5  has threads  4 . Interiorly of the threads and within the body  5 , a spider  16  has a generally hollow form with a round perimeter and three equiangular spaced legs converging in the center of the body. The spider supports a check valve  17  here shown in the open position for passage of fuel outwardly from the valve but within the round perimeter of the spider. 
         [0059]      FIG. 3  provides a longitudinal section view through the connector with the body receiving the insert. As above, the body  5  has an open end  2  that has external threads  4 . Inward of the threads, the body has the first notch  7  and then its collar  9 . Forward of the collar, the body extends inwardly of the guard though the guard fits snugly upon the exterior of the body. The body receives a portion of the insert so that the second collar  15  has a flush fit to the exterior of the body. And as above, the insert  6  has its second end  3  here shown to the right, open to dispense fuel. The insert is generally hollow for the passage of fuel through it from the hollow body. The insert also has its external threads  4 , the second notch  8 , and the second collar  15 . 
         [0060]    The interior of the body has a generally constant diameter for most of its length however, the diameter tapers within the collar to its narrowest as later shown in  FIG. 7 . The interior of the insert begins at its narrowest proximate the body and widens until just before the second collar  15 . From the second collar outwardly to the end  3 , the interior of the insert has a constant diameter. The interior of the body receives a spider  16 , or snap cone, that generally has a wedge like fit into the body. The snap cone supports a check valve here shown generally outwardly of the reduction in diameter of the interior of the body. The check valve has a generally conical shape oriented with the narrow part of the shape towards the narrowest diameter of the body. Opposite the conical shape, the check valve has a stem, generally an elongated cylinder, which faces the inflow of fuel. Parallel to the stem, a pair of biasing members, or springs  20  exerts an expansive force between the snap cone and the check valve&#39;s conical section. The check valve resists the expansive force through a pin  21  inserted into the check valve of the body and pressing against check valve of the insert. The pin remains in place separating the conical portions of the check valves so that fuel may pass through the constricted diameters of the interior of the body and the insert. Upon application of sufficient axial force, approximately  250  pounds, the insert pulls away from the body just enough allowing the springs  20  to expand along the longitudinal axis of the connector. In doing so, the spring urge the conical portions of the check valves against the narrowing inner diameters of the body and the insert so that the check valves abut the interior of the body and the insert ceasing the flow of fuel through the body and the insert. Upon the widest diameter of each check valve, each check valve has a second O-ring  19  that seals the check valve to the interior of the body and the insert respectively. Then slightly outwardly of the narrowest diameter of the body, the body has an O-ring  18  that seals the body and the insert when joined and prior to separation. 
         [0061]    Next,  FIG. 4  then shows a section view through the insert  6  just between the second collar  15  and the beveled end of the guard  9 . Within the guard, the body  5  has an extension of its collar  12  having a hollow round shape as later shown in  FIGS. 6 ,  7 . Inside of the collar  12 , the body receives a portion of the insert  6 , also of hollow round shape but of lesser diameter. Proximate the junction of the collar  12  and the insert  6 , a coil pin  22  extends through the second collar  15 , not shown, and into the extension of the collar  12 . The coil pin fits within a tightly machined aperture in the collar  12  and second collar  15 . The coil pin aids in assembly of the insert into the body during manufacturing of the connector  1 . Within the insert, this figure shows a check valve  17  in the open position within a snap cone  16 . 
         [0062]    Inwardly from  FIG. 4 ,  FIG. 5  shows a section through the body and the insert proximate the pin  21 . Within the guard  9 , the body has an extension of its collar  12 . Within the body&#39;s collar  12 , the insert fits snugly. Spaced in an equi-angular relationship around the longitudinal axis of the connector, three shear pins  23  extend through the thickness of the extension of the collar  12  into the insert  6  but not through the entire thickness as shown. The shear pins fit within tightly machined apertures, are staked in place, and are generally perpendicular to the coil pin  22  previously shown. Within the insert, a portion of the conical check valve is shown generally centered between the shear pins. Within the center of the check valve, the pin  21  is shown as a round shape. 
         [0063]      FIG. 6  shows the body  5  itself in more detail from the side. The body has its end  2 , generally hollow with threads  4  upon the exterior. The threads continue inwardly to the first notch  7 . The notch has lesser diameter than the threads. Opposite the threads, the notch merges with the first collar  12 . The first collar has greater diameter than the threads and defines the widest portion of the body. The collar includes two faces, generally mutually parallel, one face  9   a  shown here. The collar has a thickness less than the length of the threads. Inwardly from the collar, the body has its outer extension  24 . The outer extension has a generally round, hollow shape that receives the insert  6  within it. Opposite the collar, the outer extension opens for admission of the insert therein. Away from the collar and proximate the open end of the outer extension, an aperture  25  passes through the outer extension. The aperture  25  admits a shear pin as previously shown in  FIG. 5 . 
         [0064]      FIG. 7  then provides a section view through the body shown in  FIG. 6 . The outer extension  24  extends from the collar opposite the threads  4  upon the end  2 . The outer extension has a lesser thickness for approximately half of its length outwardly from the collar. Inside of the lesser thickness of the outer extension, the body has a generally cylindrical inner notch  27  here shown as two mutually parallel and spaced apart notches. The inner notch receives the insert as previously shown in  FIG. 3 . The inner notch in cooperation with the outer extension provides for a tight fit between the body and the insert. Inwardly from the lesser thickness of the outer extension and forming the interior of the inner notch  27 , the body has a generally cylindrical inner extension  28 , here shown as two mutually parallel and spaced apart extensions of lesser length than the outer extension. The inner extension is less than half of the length of the lesser thickness of the outer extension. The body away from the collar and proximate the open end of the wall, three spaced apart apertures  25  pass through the wall  30 , in an equiangular spacing with the aperture  25  in the outer extension  24 , previously shown. The apertures  25  admit three shear pins as previously shown in  FIG. 5 . 
         [0065]    Opposite the outer extension, the body has its end  2  that receives fuel. The end has threads  4  for connection to a hose, fitting, or nozzle. The end has a generally hollow cylindrical form. Inside of the end, the body has a chamber  27 , generally smooth walled of a constant diameter. The chamber extends through the end for the length of the threads and the first notch. Proximate the collar, the chamber widens to a slightly larger diameter for a short distance, as at  26   d,  to receive the rounded perimeter of the snap cone  16 . Within the collar, the chamber returns to its diameter until it merges with the throat  26  slightly outwardly from the collar. The wider diameter is shown as line  26   a,  that of the chamber. Inward of the wider diameter, the throat angles inwardly for a short distance to the second wider diameter, line  26   b.  From that line, the throat extends its second wider diameter as the inner diameter for the inner extension  28 . The transition in chamber diameter from the throat  26  to the inner extension  28  occurs over a portion of the body called the constriction  29 . The constriction reduces the diameter of the throat by approximately 40% as it transitions to the diameter of the inner extension. The constriction, being hollow and round like the throat allows for the passage of fuel through it at the least amount of adverse fluid flow effects. 
         [0066]      FIG. 8  then shows the body  5  from its end  2  where in the background, the body has its collar  12 . The collar has a generally round shape but for two mutually parallel faces  9   a  here shown upon a common diameter. The faces receive the jaws of a tool, such as a wrench, for gripping of the body during installation at a service station. Inwardly from the collar, the body has its threads  4  upon the end  2 . The threads extend around the circumference of the end in a generally tight helical manner. Inwardly from the threads and in the foreground of the figure, the end  2  shows the chamber  27  that admits fuel and then the constriction  29  that transitions the chamber to the diameter of the inner extension through the throat  26 . 
         [0067]      FIG. 9  shows the insert  6  itself in more detail from a side view, generally opposite that of  FIG. 6 . The insert has its end  3 , generally hollow with threads  4  upon the exterior. The end has a bevel, as at  3   a,  and the threads continue inwardly to the second notch  8 . The second notch has lesser diameter than the threads. Opposite the threads, the second notch merges with the second collar  15  of generally the same outer diameter as the first collar  12  so that the body and the insert form a smooth exterior surface when joined. The second collar has a greater diameter than the threads and defines the widest portion of the insert. The collar includes two faces  9   a,  generally mutually parallel as later shown in  FIG. 11 . The second collar has a thickness less than the length of the threads. Inwardly from the collar, the insert has its wall  30 . The wall has a generally round, hollow shape that fits within the outer extension  24  of the body as shown in  FIG. 3 . Opposite the second collar, the wall opens for fitting upon the inner notch  27  and the inner extension  28  of the body. 
         [0068]      FIG. 10  then provides a section view through the insert above shown in  FIG. 9 . The insert has its collar  15  slightly off the center of its length. The collar has a generally smooth face towards the threads. Opposite the threads and towards the wall  30 , the collar has at least one aperture  15   a  extending parallel to the length of the insert. The aperture does not penetrate through the collar towards the threads. The aperture receives the coil pin  22  of  FIG. 4 . Then the wall  30 , generally hollow and cylindrical upon its exterior, extends from the second collar  15  opposite the threads  4  upon the end  3 . The wall has a generally constant thickness but for the throat as later described. 
         [0069]    Opposite the wall, the insert has its end  3  that dispenses fuel. The end has threads  4  for connection to a hose, fitting, or nozzle. The end has a generally hollow cylindrical form. Inside of the end, the insert has its second chamber  31 , generally smooth walled of a constant diameter. The chamber extends through the end for the length of the threads and the second notch  8 . Proximate the second collar, the chamber widens to a slightly larger diameter for a short distance, or step, as at  32   d,  to receive the rounded perimeter of the snap cone  16 . Within the second collar, the chamber returns to its diameter until it merges with the second throat  32  slightly inwardly from the collar. The wider diameter is shown as line  32   a,  that of the second chamber  31 . Inward of the wider diameter, the second throat angles radially inwardly for a short distance to the second wider diameter, line  32   b.  From second wider diameter line  32   b,  the second throat abruptly widens to a second step as at  32   c.  The second step has a larger diameter than the wider diameter  32   b.  The second step leads to a third chamber  33 . The third chamber admits the cylindrical inner extension  28  of the body  5  while the wall  30  fits into the inner notch  27  and with the outer extension  24 . The transition in second chamber diameter from the second throat  32  to the third chamber  33  occurs over a constriction  34  within the insert. The constriction reduces the diameter of the second throat by approximately 40% as it transitions from its wider diameter to the second wider diameter proximate the third chamber at the second step. The constriction, being hollow and round like the throat allows for the passage of fuel through it with the least amount of adverse fluid flow effects. 
         [0070]      FIG. 11  then illustrates the insert  6  from its end  3  where in the background, the insert has its second collar  15 . The second collar has a generally round shape but for two mutually parallel faces  9   a  here shown upon a common diameter. The faces also receive the jaws of a tool, such as a wrench, as previously described. Inwardly from the second collar, the insert has its threads  4  upon the end  3 . The threads extend around the circumference of the end in a generally tight helical manner. Inwardly from the threads and in the general center of the figure, the end  3  shows the third chamber  33  that receives fuel from the chamber  27  of the body which transmits the fuel through the constriction  34  that transitions the inner diameter of the wall from its narrowest, as at line  32  b, through the throat  32  to the inner diameter, as at line  32   a  of the second chamber  31 . 
         [0071]    Generally for closing off the threaded connection of a hose or fitting to the connector proximate the notches  7 ,  8 , the connector provides the gasket  11  and the O-ring  10  as shown in  FIG. 12 . The O-ring  10  is generally round within an inner edge  10   a  at an inner diameter and an outer edge  10   b  at an outer diameter greater than the inner diameter. The O-ring has a generally round cross section, radially, between the inner edge and the outer edge. The inner diameter is generally slightly more than the diameter of the adaptor at the notches but less than the diameter of the thread  4 . The O-ring has a material that allows for slight stretching for placement over the threads and compression by a hose or other fitting when connected thereto. Alternatively, the connector has the gasket  11 , generally round, with an inner rim  11   a  at an inner diameter and a rim  11   b  at the outer diameter of the gasket. The inner diameter of the gasket generally exceeds that of the O-ring. The inner rim and rim of the gasket form a generally square cross section as later shown in  FIG. 14 . Upon the inner rim, the gasket has a plurality of spaced flutes  13 . Here the flutes have a generally semi-circular shape extending inwardly into the gasket, towards its nominal center. The radius of each flute begins at the inner rim and turns through 180 degrees of arc. Preferably, the gasket has an even number of flutes, here shown as six. The flutes engage the threads  4  of the body  5  and insert  6  and allow a user to rotate the gasket to a desired position upon the each end of the connector. Either gasket or O-ring are used, but not both, are used for sealing either end of invention. 
         [0072]      FIG. 13  then shows a cross sectional view of the gasket  11 . The gasket has the rim  11   b  that faces outwardly from the gasket and connector when installed, and the opposite inner rim  11   a  upon the interior of the gasket. Perpendicular to the rim and the inner rim, an edge  5   c  joins the two rims upon both sides of the gasket. The edges and the two rims generally form a square cross section as shown in the top and the bottom of the figure. Upon the inner rim, the gasket has the flutes  13 , generally equally spaced. Each flute has a thin tip  13   a  away from the inner rim than merges with shoulders  13   b  of greater thickness than the tip. The shoulders join to the inner rim. The flutes and the tips extend inwardly, that is, away from the inner rim. 
         [0073]      FIG. 14  then shows the perimeter of the gasket more closely. Though showing a portion of the perimeter in this figure, the structure extends upon the entire perimeter of the gasket. The gasket has the inner rim  11   a  with a flute  13 , rim  11   b,  and edge  5   c  as before. The rim though in this embodiment has a slight slope  5   d,  extending from left to right in the figure. The slope is approximately 1 to 4 degrees and oriented so that the bottom of the slope advances towards the collar upon turning the gasket on a stem. The edge  5   c  further includes a taper  5   e  partially along the length of the edge. The taper begins at the thickness of the gasket and then narrows slightly about midway along the edge. 
         [0074]    Another form of the edge  5   c  appears in  FIG. 15   a  with a perimeter sectional view. The gasket begins with a flute  13  upon the inner rim  11   a  with the opposite, or outwardly, rim  11   b  as before. The rim has its slope  5   d  outwardly from the inner rim similar to that shown in  FIG. 12 . Unlike the smooth edges  5   c,  this embodiment has three mutually spaced apart barbs  14  here shown in section. The barbs appear as concentric rings upon the edges when see as in  FIG. 12 . The barbs, as a group, extend at least midway from the inner rim to the rim. The barbs have their narrowest portion outwardly towards the rim and their thicker portion inwardly towards the inner rim. Outwardly from the barbs  14 , the gasket has a tip  5   f  generally proximate the rim. The tip generally lacks barbs or other securing surface features.  FIG. 15   b  orients the sectional view to a flat orientation as a hose or fitting would abut the gasket. In  FIG. 15   b  though, the rim  11   b  at the tip  5   f  is generally square, or without a slope. This figure also shows a partial section of a flute where the tip extends inwardly from the shoulders. 
         [0075]    A third form of the edge  5   c  appears in  FIG. 15   c , also in a perimeter sectional view. The gasket has its flute extending inward from the inner rim  11   a  with the opposite, or outwardly, rim  11   b  as before. The rim has its slope  5   d  outwardly from the inner rim similar to that shown in  FIG. 14 . This embodiment also has three mutually spaced apart barbs  14  here shown in section. The barbs appear as concentric rings upon the edges when seen as in  FIG. 12 . These barbs, as a group, span from the inner rim to the rim. The barbs have their narrowest portion outwardly towards the rim and their thicker portion inwardly towards the inner rim. In this embodiment, the gasket lacks a tip as in the previous embodiments of the edges.  FIG. 15   d  orients the sectional view to a flat orientation as a hose or fitting would abut the gasket. Similar to  FIG. 15   b , the rim  11   b  is generally square, or without a slope. The rim also truncates the outer barb on the top and bottom edges. This figure also shows a partial section of a flute where the tip extends inwardly from the shoulders. 
         [0076]    Provided for fixed mounting within the body and the insert are spider mounts or snap cones that likewise support the check valves as previously described. The check valves rest within a stem support, formed within the mount and with the springs  20  normally biasing the check valves against the throat, or valve seats, formed within the body and the insert. An O-ring  19  fits on each valve, so as to assure a fluid tight seal when the valve is seated upon its valve seat. A pin  21 , towards the interior of the invention or between both check valves, such that when the insert  6  is installed within the body  5  and both within the guard  9 , the pin biases against the stem of the oppositely aligned check valves  16  and thereby forces both check valves to unseat from their respective valve seats. In doing so, the check valves remain open to allow for fuel flow through the invention. 
         [0077]    The various pressures withstood by the connector of this invention are calculated to furnish the required strength to maintain the breakaway hose connector in its operative configuration, and to resist separation. Obviously, this type of pressure can be varied, based upon the amount of axial force resisted by a given shear pin and its biasing springs built into the device. But, in the preferred embodiment, it has been designed to withstand tensioning forces exerted upon the fuel line hose of at least one hundred pounds, and preferably two hundred fifty pounds. Most of this force is attained through the shear strength of the shear pins engaging the common apertures between the body and the insert. However, upon separation of the insert from the body, the check valves slam shut upon their valve seats in the throats of the body and the insert. 
         [0078]    To produce a normal disengagement of the connector device, a tensioning force is exerted upon the fuel line in which the connector is located as previously described. When a tension force is exerted upon the connector, the force is directly upon the body and the insert. As the tension builds, in this embodiment, the same force is exerted upon the connector  1 , through its interconnected fuel line, and this force tends to pull the insert  6 , slightly out of the outer extension  24  of the body  5  but within the guard  9 , in an effort that tends to withdraw the insert slightly from within the body to provide for an instantaneous disengagement of the body from the insert. As this occurs, simultaneously the pin  21  allows the poppet valves or check valves  17  to be spring biased against their respective valve seats as the fuel line falls away. 
         [0079]    Thus, when disconnection has occurred, because of the exertion of the tensioning force upon the fuel line in which the connector inserts, and through the exertion of such force physically upon the connector  1  itself, the connector disconnects, the various check valves instantaneously close, preventing the flow or leakage of any further fuel from the end of the fuel line, fitting, or a handle of a nozzle, even though a break has occurred, thereby preventing the hazardous spillage of fuel or other fluids onto the surrounding area, as previously explained. 
         [0080]    Thus, this invention provides a single seal breakaway connector that prevents untimely spillage when a disconnection occurs where a fuel line separates during a drive away situation. The connector includes internal check valves that seal off the flow of fuel through the two components threaded upon the connector. The connector also accommodates the various internal pressures that arise from pressure spikes that occur as fuel ebbs and flows through hoses, fittings, and nozzles as the handle is engaged and disengaged by the user. 
         [0081]    From the aforementioned description, a single seal breakaway connector has been described. This single seal connector is uniquely capable of a smooth exterior between the body and the insert having a common outer diameter, faces upon both collars suitable for gripping by a wrench or other tool, and a flow constriction interior of the check valves between both the body and the insert. Though the various components and other components are shown and described with round cross-sections, other cross-sections are possible in alternate embodiments. This single seal breakaway connector and its various components may be manufactured from many materials including but not limited to polymers, low density polyethylene, high density polyethylene, polypropylene, nylon, ferrous and non-ferrous metals, their alloys, and composites. 
         [0082]    Variations or modifications to the subject matter of this invention may occur to those skilled in the art upon reviewing the development as described herein. Such variations, if within the scope of this development, are intended to be encompassed within the principles of this invention, as explained herein. The description of the preferred embodiment, in addition to the depiction within the drawings, is set forth for illustrative purposes only.