CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    (Not Applicable)  
         STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT  
         [0002]    (Not Applicable)  
         BACKGROUND OF THE INVENTION  
         [0003]    The present invention relates in general to tubing connectors, and in particular to a flexible tubing connector including therewithin a grip ring member for grippingly engaging the terminal portion of a length of tubing when presented for retention and an exteriorly accessible hand-operable release member for selectively releasing the grip ring member. The connector is especially useful in tubing connections found in recreational vehicles and marine craft.  
           [0004]    Tubing connectors are widely used in applications ranging from simple under-sink plumbing connections to sophisticated fluid delivery apparatus employed in highly technical industrial settings. Common among all applications, however, is a need for leak-proof connections that are rapidly attainable irrespective of the specific connection purpose. One typical prior art design provides relatively simple internally or externally threaded ends to a length of rigid or flexible tubing to be used for subsequent threaded engagement at each end thereof with respective conduits needing connection. While such an approach can accomplish a functional fitting which can be rendered leak-proof with proper washer placement, the time, effort, and tool requirements in achieving attachment of the length of tubing many times is prohibitive.  
           [0005]    To overcome the disadvantages of threaded attachments, quick-action connectors have been developed which generally include a cylindrical connector body into which a conduit such as a pipe is inserted and automatically retained without the use of tools. Such a connector body usually has therewithin a gasket member for creating liquid-tight transfer, and a plurality of various parts to accomplish conduit capture. Generally, however, this plurality of parts that provides functionality is rather complicated to manufacture and/or assemble thereby being cost prohibitive. Further, such prior art devices typically require extensive interactional cooperative movements among the parts to occur smoothly and in an almost orchestrated manner for positive and reliable connections between conduits to occur. Exemplary of such prior art tubing connectors are U.S. Pat. No. 5,722,696 issued to Taneya; U.S. Pat. No. 4,804,213 issued to Guest; U.S. Pat. No. 4,867,484 issued to Guest; U.S. Pat. No. 5,024,468 issued to Burge; U.S. Pat. No. 5,096,235 issued to Oetiker; U.S. Pat. No. 5,260,179 issued to Tagagi; U.S. Pat. No. 5,161,834 issued to Norkey; U.S. Pat. No. 5,219,188 issued to Abe, et al.; U.S. Pat. No. 5,468,027 issued to Guest; U.S. Pat. No. 5,779,284 issued to Guest; U.S. Pat. No. 5,915,738 issued to Guest; U.S. Pat. No. 5,934,713 issued to Guest; and U.S. Pat. No. 6,019,396 issued to Seito, et al. Thus, while quick connections can occur when all parts are properly working in typical prior art apparatus, it is apparent that a substantial need is present for a quick connector having minimal moving parts that is readily manufacturable and less prone to malfunction and thereby results in a more dependable, economical connector product.  
           [0006]    In view of this need, a primary object of the present invention is to provide a rapid connector especially useful for connecting flexible tubing and having a single axially movable member to facilitate disconnection of the connector from tubing.  
           [0007]    Another object of the present invention is to provide a connector wherein the movable member is only active in achieving user-selected release of the connector from the tubing while connection to the tubing is facilitated automatically merely by axial insertion of the tubing into the connector.  
           [0008]    These and other objects of the present invention will become apparent throughout the description thereof which now follows.  
         BRIEF SUMMARY OF THE INVENTION  
         [0009]    The present invention is a connector for releasably retaining and forming a fluid tight seal upon a terminal portion of a length of tubing preferably flexible tubing. The connector includes a coupler member having a proximal end with a proximal opening thereto and a distal end with a distal opening thereto. A circular coupler bore with an interior circumferential wall extends axially through the coupler member and has a reduced diameter annular shoulder extending from the wall within the bore and upon which a o-ring is seated for creating a liquid-tight seal with the terminal portion of the length of tubing when inserted into the connector. A generally cylindrical guide member having a circular guide bore extending therethrough is co-axially secured in place within the coupler bore immediately inside the proximal opening of the coupler member.  
           [0010]    The connector further includes a grip-ring member having a laterally deployable toothed distal end for grippingly engaging the terminal portion of tubing, and a sleeve limiter disposed around the ring member for selectively restricting axial and radial movement of the ring member. The ring member and surrounding limiter are co-axially disposed within the guide member. An exteriorly accessible hand-operable release member is provided for selectively engaging the toothed distal end of the grip ring member. The release member additionally operates in concert with the tubing when inserted into the proximal opening such that the release member is moved axially by the tubing during insertion of the tubing into the connector thereby causing deployment of the toothed distal end of the grip ring member to allow automatic insertion of the tubing into the connector. Thereafter, the release member moves axially to a non-release position upon minimal reverse-directional travel on the tubing whereby the toothed distal end of the grip ring member moves radially inward to embed itself into the tubing and prevent any inadvertent disconnection of the tubing from the connector. When desired to disconnect the connector from the tubing, manual inward axial movement of the release member axially displaces the sleeve limiter and allows the toothed distal end of the ring member to radially move outwardly from the tubing which results in release thereof of the retained tubing and its withdrawability from the connector. Depending upon functional requirements, either only the proximal opening or both the proximal and distal openings of the coupler member are provided with tubing retention capability as above defined.  
           [0011]    Thus, the connector of the present invention provides a tubing connector which allows a fluid-tight seal to be rapidly obtained upon the end of a tubing member merely by axial insertion of the tubing member within the connector with the O-ring being compressed between the connector and the circumference of the tubing. Such axial insertion of the tubing within the connector is facilitated without any manual manipulation of the connector or portions thereof. Subsequently, inadvertent disconnect of the tubing from the connector is prohibited by engagement of the tooth distal end of the ring member against the periphery of the tubing. However, when manual disconnect of the connector from the tubing is desired, inward axial movement of the release member allows the tooth distal end of the ring member to move radially away from the pipe periphery and thereby allows unobstructed removal of the tubing from the connector.  
           [0012]    In the preferred embodiment, the connector of the present invention can be formed in differing pipefitting/connector configurations, such as conventional couplings, elbows, Tee&#39;s, swivels, unions and the like so as to be applicable for all tubing connection applications. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]    An illustrative and presently preferred embodiment of the invention is shown in the accompanying drawings in which:  
         [0014]    [0014]FIG. 1 is a side elevation view of a tubing connector of the present invention;  
         [0015]    [0015]FIG. 2 is a side elevation view partially in section of the connector of FIG. 1 disassembled;  
         [0016]    [0016]FIG. 3 is side elevation view in section of a portion of the connector of FIG. 1 illustrating the manner in which tubing may be easily axially inserted into the connector;  
         [0017]    [0017]FIG. 4 is a side elevation view similar to FIG. 3 illustrating the manner in which the tubing is prevented from inadvertent disconnect from the connector; and  
         [0018]    [0018]FIG. 5 is a side elevation view in section of an L-shaped swivel tubing connector formed in conformity with the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0019]    Referring to FIGS.  1 - 4 , a coupling connector  10  is shown for releasably retaining the terminal end portions  12  of a pair of lengths of fluidic tubing  14 . Although not by way of limitation, in the preferred embodiment the fluidic tubing  14  comprises lengths of flexible polymer tubing, such as high-pressure extruded cross-link polyethylene tubing. Those skilled in the art will recognize that the connector  10  is applicable to other more generally rigid pipe such as polyvinylchloride (PVC) and acetylbutylsilicate (ABS), as well as a brass connection interface with fittings. An increased diameter recess  28  is disposed adjacent the ends  20  and  22  and an annular shoulder  30  is disposed axially inward adjacent ends  20  and  22 . The annular shoulder  30  seats a conventional O-ring  32  which as shown is disposed a short distance axially inward from opposite ends  20  and  22  of the cylinder coupler body  16 .  
         [0020]    A generally cylindrical guide member  34  having a circular guide bore  36  formed therethrough is axially retained within the enlarged diameter section  28 . Both the body  16  and guide member  34  are preferably fabricated of identical polymeric material so as to be capable of being sonically welded together to form a rigid assembly. In the preferred embodiment, such polymer material is a commercially available polysulfone, however those skilled in the art will recognize that different polymeric materials are contemplated herein.  
         [0021]    Co-axially disposed within the guide bore  36  of the guide member  34  are a stationery grip ring member  38  and sleeve limiter  40 . In the preferred embodiment, the grip ring member  38  is preferably formed of a stainless steel material having plural axially extending slots  41  preferably equally spaced along its perimeter which define plural tooth like members  42  having relatively sharp chisel point distal ends. The tooth like members  42  are designed to be capable of limited radial flexion as will be described in further detail to allow quick axial insertion of the tubing length  14  into the connector while prohibiting inadvertent tubing disconnect from the connector.  
         [0022]    The sleeve limiter  40  is preferably formed of a polymer material different from the polymer material utilized on the body  16  and guide member  34  such that the limiter  40  is not sonically welded to the body  16  and/or guide member  34  during the manufacturing process. As shown in FIGS. 2, 3 and  4 , the distal end  35  of the guide member  34  is formed having an annular bevel  35  which cooperates with a complementary formed annular bevel  41  formed in the sleeve limiter  40 .  
         [0023]    The assembly of the various members to form the coupler  10  of the present invention is facilitated by first inserting the O-ring  32  to reside within the interior of the body  16  and be seated against the annular shoulder  30 . Subsequently, the ring member  38  may be inserted to reside within the interior diameter of the sleeve limiter  40  with both members being axially disposed within the interior diameter of the guide member  34 . Subsequently, the grip ring member  38 , limiter member  40  and guide member  34  may be inserted into the proximal end  20  of the body  16 . The guide member  34  may then be affixed or secured to the enlarged diameter  28  of the body  16  preferably via sonic welding. In this regard, in view of the guide member  34  and body  16  being formed of the same polymer material while the limiter  40  being formed of a differing polymer material, the sonic welding process securely fastens the guide member  34  to the body  16  while not affixing the limiter  40  to the guide member  34 . However, those skilled in the art will recognize that differing assembly techniques are contemplated, such as spin-welding and/or adhesive bonding.  
         [0024]    Subsequently, an annular release member or sleeve  44  may be inserted axially through the limiter  34 . As best shown, the release member  44  includes an enlarged flange portion  46  adjacent one end, a reduced diameter central portion and an end portion  45  having a diameter greater than the central portion  44  but less than the internal diameter of the gripper ring member  38 . The diameter portion  45  additionally is provided with plural slots  47  such that the diameter portion  45  is free to moderately radially flex inwardly and/or outwardly. The release member  44  may then be axially pushed through the interior of the sleeve limiter  40  and ring member  38  such that the diameter portion  45  resides between opposite ends of the sleeve limiter  40  as depicted in FIGS. 3 and 4. As will be recognized, by this assembly the release member  44  may be axially reciprocated relative the body  16  for a short distance with forward axial movement being stopped by contact with the O-ring  32 , with rearward axial movement being stopped by contact with the annular wall  51  formed on the guide member  34 . Although for purposes of description, the assembly of the limiter  40  ring member  38  guide member  34  and release member  44  were described in relation to only the proximal end of the body  16 , it will be recognized that the same assembly is contemplated on the distal end  22  of the assembly  16  such that opposite pipe lengths  14  may be inserted into the coupling connector  10  of the present invention.  
         [0025]    With the structure defined, the operation of the coupler connection  10  of the present invention may be described with specific reference to FIGS. 3 and 4. As best shown in FIG. 3, when it is desired to form a fluid-tight connection between the tubing end  14  and the coupler  10 , a user merely co-axially aligns the tubing end  12  with the axial bore formed in the release member  46 . Subsequently, the tubing length  14  may be inserted axially through the interior of the coupler until such time as the distal end of the tubing abuts the annular shoulder  61  formed on the body  16 . During axial travel of the tubing end  12 , the tubing compresses the O-ring  32  causing a fluid-tight connection to be obtained between the periphery of the tubing end  12  and O-ring  32 . During such axial insertion of the tubing, the release member  46  is free to travel axially inward a short distance whereby the limiter member  40  is moved a slight distance axially inward such that its beveled annular diameter  41  is slightly spaced from the annular beveled diameter  35  formed on the guide member. In view of the separation of the beveled annular surfaces  41  and  35 , the distal end of the limiter member  40  is free to move radially outward away from the tubing such that the flexible teeth  42  of the gripper ring member  38  are additionally free to move radially outward off the periphery of the tubing end  12  as shown in FIG. 3. Thereafter, a slight rearward movement of tubing  12  in a direction opposite to the arrow shown in FIG. 3 causes the release member  40  to move a slight distance axially away from the body  16  to a position shown in FIG. 4. During such slight axial rearward movement, the beveled annual surface  41  on the limiter member  38  contacts the annular beveled surface  35  on the guide member whereby the limiter member is axially compressed causing the teeth members  42  formed on the ring member  38  to tightly contact the periphery of the tubing end  12  as depicted in FIG. 4. The contact of the tooth portions  42  of the limiting ring member  38  prevent any further axial movement of the tubing end  12  relative the coupling body  16 . As such, insertion of the tubing length  12  into the connector can be easily facilitated merely by axial movement of the tubing relative the coupler and without the need for any manual manipulation of any component of the coupler assembly. Additionally, once a slight rearward movement of the coupler relative the tubing end  12  is facilitated, i.e., from the position shown in FIG. 3 to that shown in FIG. 4, any inadvertent disconnect of the tubing end  12  from the coupler is prohibited by interaction of the tooth portions  42  of the gripper ring  38  contacting the periphery of the tubing end  12 . As such, the gripper ring  38  forms a unidirectional gripping mechanism to allow easy insertion yet prevent inadvertent disconnect of the tubing from the connector.  
         [0026]    When it is desired to selectively disengage and/or release the coupler  10  from the tubing end  12 , a user merely manually axially reciprocates the release member from its position shown in FIG. 4 back to its position shown in FIG. 3 wherein the limiter member  40  moves a short distance axially inward such that a slight gap exists between the annular surfaces  41  and  35 . The release member thereby radially extends the tooth portions  42  of the gripper ring  38  such that the tubing length  12  is then free to be axially separated from the connector  10 . As such, the connector  10  of the present invention facilitates rapid connection and easy selected disconnection of the coupler from a tubing length.  
         [0027]    Referring more particularly to FIG. 5, an additional embodiment of the present invention is disclosed which comprises a swivel elbow fluidic connector. As will be recognized, in this embodiment, one end  80  is formed and fabricated in an identical manner to that described in relation to the coupler connector  10  described in FIGS. 1 through 4. However, the lower opposite end of the connector  50  is formed to have a swivel connection which accepts a standard threaded pipe end (not shown) or, preferably, a straight-thread (Qest) pipe  67  as illustrated in FIG. 5. As there shown, a retainer ring  58 , which, upon connector assembly, is sonically welded to the end  63  of the connector  50 , precedes entry into the threaded collar  56 , and is followed by a compressible flat washer  65  such as a rubber washer to fit over the beveled angle  72  of the ring  58 . A liquid-tight connection is then completed by inserting the pipe  67  into the collar  56  and tightening the pipe  67  such that the washer  65  becomes an interface between the ring  58  and adjacent end of the pipe  67  along the plane of the beveled angle  72 . As such, a conventional threaded fastener not shown may be threadably inserted into the threaded aperture  56  and which upon axial threaded insertion, compresses the washer  65  between the threaded tubing connection and the retainer ring  58 . As such, a fluidic seal is provided between the connector  50  and threaded tubing end. An additional tubing end may then be inserted into the opposite end of the connector in a manner previously described to form a fluid-tight seal. As earlier mentioned, although for purposes of illustration, only a straight coupler and swivel connector have been depicted. However, those skilled in the art will recognize that the inventive concepts of the present invention are equally applicable to other conventional tubing fittings such as elbows, T&#39;s, unions and the like. The connector  10  is formed having a generally cylindrical body  16  having a proximal end  18  with a proximal opening  20  thereto, a distal end  22  with a distal opening  24  thereto, and a circular coupler bore  26  extending axially between the ends  20  and  22 .  
         [0028]    While illustrative and presently preferred embodiments of the invention have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims are intended to be construed to include such variations except insofar as limited by the prior art.
A connector for releasably retaining tubing includes a coupler bore with a O-ring member, a co-axial guide member, a stationary grip-ring member having a radially deployable toothed distal end for grippingly engaging the terminal portion of tubing, and a sleeve limiter disposed around the ring member for restricting ring member axial movement. A release member laterally deploys the toothed distal end and additionally operates in concert with inserted tubing to cause radial deployment of the distal end to cause surrounding receipt of the tubing. The release member then moves to a non-release position upon minimal reverse-direction tubing travel for automatic tubing retention by the toothed distal end of the stationary grip ring member. Hand movement of the release member radially deploys the toothed distal end which results in release thereof of the retained tubing and its withdrawability from the connector.