BACKGROUND OF THE INVENTION:

A fluid coupling or fitting specifically structure for the quick connection to an internally fitted fluid channeling conduit wherein the coupling assembly is spe- cifically structured to accomplish a quick disconnect such as in low pressure application or a slow disconnection and removal of the conduit such as in high pressure application or when the coupling and associated conduit is used for the handling of relatively hot liquid such as in hydraulics.

THE PRIOR ART

Quick connect-disconnect couplings or fitting assemblies have been known in the prior art for many years. Such prior art couplings are also applied in the handling of either hydraulic or gaseous fluids and the design and structural configuration of such couplings vary widely de¬ pendent upon the particular application for which they are intended.

While such quick connect-disconnect couplings are primarily designed for convenience of installation and re- moval, couplings of this type either present a safety hazard or are not capable of being used when the fluids being handled or channeled through the coupling or fitting are under a relatively high pressure. This is due to the well recognized problem that an inadvertent quick discon- nect of a conduit or coupling from its mating component

could cause a rapid discharge of the fluid being handled due to the high pressure involved. Accordingly, such, quick connect-disconnect couplings are generally not considered safe when dealing with high pressure applications. Of the prior art fittings or coupling assemblies available there are generally considered to be two broad categories. These categories include first the relatively expensive generally spring-loaded, quick connect type of coupling and secondly, the relatively inexpensive, quick connect but less than quick disconnect type of coupling or fitting. The latter structure is generally found in low pressure applications such as plumbing or the like.

Certain inherent and well recognized disadvantages present in prior art structures include the relatively com- plex structure requiring several relatively expensive mating components, some of which components include and are specifically directed to the spring-loading effect neces¬ sary particularly to accomplish the quick disconnect fea¬ tures of prior art couplings. Particularly when dealing with, high or even moderately high pressure certain features of the quick disconnection can be dangerous, as set forth above. This same danger occurs when dealing with fluids which are utilized at relatively high temperatures. It should be readily apparent that an inadvertent discon- nection of a coupling or fitting assembly could result in serious damage done to the surrounding personnel.

Accordingly, there is a need in this industry for a fitting or coupling assembly capable of operating both as a quick connect and quick disconnect type of coupling wherein a conduit or tube, .used to channel fluid, under pressure, may be readily attached or disconnected from a fitting or coupling assembly. In addition, such a pre¬ ferred fitting assembly should be structured so as to accomplish what may be herein referred to as a slow dis- connect or detachment of the conduit from the fitting or coupling wherein such "slow disconnect" is particularly applicable for situations involving high pressure or even

moderately high pressure or when dealing with fluid at relatively high temperatures. In addition, the preferred fitting or coupling assembly should be further structured to have certain inherent safety features even when removing or disconnecting the aforementioned fluid handling conduit by a quick disconnect operation. Such a safety feature would eliminate or seriously reduce damage done to the user of .the coupling, or surrounding personnel, when a quick disconnect of the conduit is attempted inadvertently under high pressure conditions.

SUMMARY OF THE INVENTION

This invention relates to a fluid fitting or coupling assembly of the type specifically designed to pro¬ vide a quick connection or disconnection of a fluid handling conduit into a fitting or coupling for interconnection of the conduit through tubing, conduits, channels, etc. More specifically, the coupling assembly of the present invention is specifically structured and designed to provide for a slow disconnection of the conduit from the coupling assembly wherein such slow disconnection may be generally defined as a gradual removal or displacement of the fluid handling conduit from the fluid tight sealing engagement with the coupling assembly so as to gradually release or reduce the fluid pressure thereby preventing any extremely rapid escape of pressurized fluid or an inadvertent separation of the coupling assembly itself.

As will be explained in greater detail hereinafter, the coupling assembly of- the present invention comprises a primary body having a central channel extending coaxially therethrough wherein one end of the body may take the form of any one of a variety of male fittings for interconnection to additional fluid directing conduit, tubing, etc. The other end of the primary body is connected to a retaining member, preferably in the form of a ring having a main por- tion which, in a preferred embodiment, is removably attached to the main body as by a threaded connection. The

retaining member further includes a plurality of arms in¬ cluding at least two arms disposed in opposed, spaced apart relation to one another wherein the arms are pivotally secured to the main portion of the retaining member. Each arm includes an inwardly directed angularly oriented re- taining finger extending inwardly towards a longitudinal central axis of a central passage of the retaining member wherein the central passage of the retaining member and the central channel of the primary body are disposed in aligned coaxial relation to one another for receipt and maintenance of a fluid channeling conduit therein. The conduit is positioned such that an open end thereof is disposed on the interior of the primary body in fluid receiving relation to a high pressure end or side of the primary body for channel¬ ing of fluid therethrough. An important feature of the present invention is the placement of a seal means, which may be in the form of one or more 0-rings engaging the exterior surface of the contained conduit in spaced _. relation from the open end thereof. Another important feature of the present invention is the existence of a stop member integrally formed on the exterior surface of the conduit and in one embodiment, ex¬ tending outwardly therefrom into cooperative abutting, interruptive engagement with a free or distal end of each of the retaining fingers. Accordingly, in a retained and "locked" position the stop member is positioned between one end of the primary body and the retaining fingers and effectively wedged or locked in such position due to the inability of the fingers to flex or move outwardly along the direction of their own length. However, the retaining member and specifically the opposing arms containing the retaining fingers are pivotally connected such that an opposing inwardly directed force to both fingers, concurrently, will cause the re¬ taining fingers to be pivoted out of abutting, interrup- tive engagement with the stop member thereby providing a quick removal and disconnection of the conduit from the interior of the primary body and retaining member and out-

wardly from the aligned central channel and central passage of the body and retaining member respectively. The quick connect insertion or coupling of the conduit to the pri¬ mary body and retaining member occurs just as simply by axially directed force disposing the conduit and speci¬ fically the open end thereof into the aligned passage and channel. The inherent flexibility of the arms and/or the retaining fingers themselves will allow the pivotal move¬ ment of the fingers and/or the arms in an outward direction transverse to the length of the fingers. As set forth above, the displacement of the retaining fingers along their own length in a direction outwardly towards the re¬ spective arms from the free or distal ends of the retaining fingers is prevented specifically due to the angular in- clination or orientation of the retianing finger.

A slow disconnection or removal of the conduit is accomplished by a progressive detachment of the retaining -member from the primary body such as when the two afore¬ mentioned members are unthreaded from one another. This gradual or progressive removal or displacement of the re¬ taining member from the primary body causes a concurrent progressive and gradual displacement of the open end of the conduit along the interior of the central channel of the primary body in the direction of fluid flow through the coupling. This gradual displacement of the conduit is caused by the fluid pressure itself acting on the open end. Once the open end passes beyond the seal means associated with the primary body the fluid tight seal de¬ fined therebetween is broken and the high pressure fluid is allowed to escape in a somewhat "controlled" fashion between the exterior surface of the conduit and the in¬ terior surface of the primary body and eventually into an expansion chamber or space of enlarged dimension. Escape of the pressurized fluid into the aforementioned expansion space which is defined by a greater interior diameter of the retaining member allows at least partially, the high

pressure state of the fluid to be dissipated thereby some¬ what relieving or reducing the danger in a quick release coupling. A complete separation of the primary body from the retaining member will cause a complete separation of the conduit and displacement thereof from the sealing engage¬ ment with the primary body.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a longitudinal cross sectional view of a preferred embodiment of the coupling assembly of the present invention.

Figure 2 is an end view along line 2-2 of Figure 1.

Figure 3A, 3B and 3C are progressive views in cross section and partial cutaway showing reaction of the various components of the coupling assembly to ac.complish a quick connect insertion of the conduit relative to the interior of the coupling assembly.

Figure 4A, 4B and 4C each represent a sectional view in partial cutaway representing the relative compo- nents and their cooperative relation to one another to accomplish a quick disconnection or removal of the conduit. Figure 5A, 5B and 5C are cross sectional views in partial cutaway showing a slow disconnect of the conduit from the interior of the coupling assembly. Figure 6 is another embodiment of a stop struc¬ ture associated with the conduit.

Figure 7 is yet another embodiment of the stop structure associated with the conduit of the present in¬ vention. Figure 8 is another embodiment of the coupling assembly of the present invention shown in cross section and partial cutaway.

Figure 9 is yet another embodiment of the coupling assembly of the present invention shown in cross section and partial cutaway.

DETAILED DESCRIPTION OF THE INVENTION

As shown in Figure 1, the coupling assembly of the present invention is generally indicated as 10 and includes a primary body 12 having one free end, as pictured in Figure 1, which may be any type of fitting, such as a male fitting 20. The coupling assembly 10 further includes a retaining member generally indicated as 14 where, in a preferred embodiment as shown in Figure 1, the body 12 and the retaining member 14 are removably connected together by means of a threaded connection as at 16 and 16'. The pri¬ mary body has a centrally disposed channel extending com¬ pletely therethrough and, for purposes of explanation the free end of the body 12, as shown in Figure 1 will be considered the high pressure side wherein pressure is entering the coupling assembly 10 under pressure from the free end passing through the channel 18. The primary body 12 further includes a seal means preferably in the form of an O-ring 24 mounted in a groove or like integrally formed recess or channel 22 and dimensioned and positioned so as to extend outwardly therefrom into sealing engagement with the external surface of any type of conduit 38 con¬ nected to the coupling or fitting assembly 10 by passing into the central channel 18.

Similarly, the retaining member 14 includes a central channel 26 of somewhat greater inside diameter. As shown in Figures 1 and 2 the retaining member 14 includes a main portion 27 and a plurality of arms 32 extending out¬ wardly therefrom in parallel relation to the longitudinal axis of the passage 26. Each arm 32 is spaced apart from one another by proper spacing 34 extending between each of the plurality of fingers 32 as shown. The spacings 34 are represented to be between a plurality of fingers where in reality the subject coupling assembly would operate in effect with only two opposing fingers as best represented in longitudinal section of Figure 1 and indicated as 32. Ac¬ cordingly, each of the arms 32 are pivotally connected sub¬ stantially at 33 to the main portion 27 of the retaining

member 14 and further, each of the arms 32 include a de¬ pending finger 28 integrally or otherwise attached thereto which may be formed of somewhat inherently flexible material and which extend inwardly toward the interior of the retaining member and longitudinal central axis of the passage 26 at an angular incline toward the primary body 12 as clearly shown in Figure 1. These fingers 28 are joined at junction 30 between the respective arms 32 at one end of the respective retaining fingers 28. The oppo- site end of each of the respective fingers 28 is represented as 44 and cooperates with a stop member indicated as 42. The stop member 42 is spaced inwardly along the length of the conduit 38 from the open end 40 and preferably, in the embodiment of Figure 1, outwardly from the outer surface of the conduit 38. Further, the stop member 42 may be in the form of an integrally formed outwardly extending annularly configured rim or ring protruding a sufficient distance outwardly from the outer surface of the conduit 38 to engage the free or distal end 44 of the retaining fingers 28. Another important feature is the spacing of the stop member 42 a sufficient distance from the open end 40 of conduit 38 to allow the open end 40 be positioned beyond or upstream of the seal means 24 so as to establish a fluid tight seal between the conduit and the interior of the primary body 12.

With regard to Figures 3A-B,4A-B and 5A-B, the specific structural features of the present invention allow the structural embodiment of Figures 1-5 to be selectively connected in what may be referred to as a quick connect mode and disconnected in what may be referred to as a quick disconnect mode and through further manipulation of the coupling to be further disconnected alternately by a slow disconnect mode such as in high pressure situations when disconnection must be done carefully and preferably con- current to at least some fluid pressure dissipation prior to complete separation of the conduit 38 from the coupling assembly 10.

With regard to Figures 3A-C, the various steps shown indicate the relative positions of each of the retain¬ ing fingers 28 and arms 32 of the retaining member 14 while the conduit 38 is being inserted. Such quick connect in- sertion is accomplished merely by axial pushing or pressure being applied on the conduit 38 relative to the retaining member in the direction indicated by arrow 41. Figure 3A shows the stop member 42 immediately prior to coming in contact with the free end 44 of the retaining finger 28. Figure 3B shows actual contact being made and the outward flexure or pivotal movement of the finger 28 as the stop member passes beyond the free end 44 of the finger 28. The angular inclination and specific orientation of the re¬ taining finger 28 allows the inward flexure as represented in Figure 3B.

Once the conduit 38 is properly positioned such that stop member 42 is beyond the free end 44 of the re¬ taining fingers 28, the retaining fingers 28 are prevented from flexing in a reverse or outer directdion from that shown in Figure 3B due to their angular inclination. For purposes of clarity, Figures 3A, 3B and 3C are shown primarily with¬ out direct connection to the primary body 12. Suffice it to say at this point however that such action of the fingers occurs while the primary body 12 and retaining member 14 are in the assembled position as represented in Figure 1.

With regard to Figures 4A, 4B and 4C the quick disconnect mode of operation is shown. As shown in Figure 4A the conduit 38 is in its locked and maintained position on the interior of the retaining member 14.

Figure 4B shows external inwardly directed con¬ current force being applied as indicated by the directional arrows preferably to the ends of the arms 32. Such concurrent external pressure being applied causes a pivotal movement of the arms 32 about pivot points 33 and an entire inward move¬ ment of the retaining fingers 28 and specifically the free ends thereof as at 44 beyond the stop member 42. The conduit

is thereby free to move outwardly and be quickly disconnected from the entire coupling assembly 10 as shown in Figure 4C. It should also be emphasized that the pivot point 33 is located substantially at the juncture of the arm 32 rela- tive to the main body portion 27 and in substantially corresponding position where the various spaces 34 between the arms 32 end or terminate at the main portion 27 of the retaining element 14.

With regard to Figure 5A, 5B and 5C a slow disconnect mode of operation is accomplished by gradually unthreading and therefore progressively removing.or displacing the retaining member 14 from the primary body 12. It should be recalled that the existence of the high pressure fluid in the coupling will force the open end 40 of the conduit 38 along the direction of travel of fluid flow generally from the free end 20 of the primary body 12 towards and in the direction of the placement of the retaining member 14. Accordingly, since the existence O. the high pressure when the completely locked position will cause the stop member 42 to engage and be locked agianst the free ends 44 of the fingers 28, a gradual or progressive displacement or removal of the retaining member 14 from the primary body 12 will cause a progressive displacement of the conduit along the length of the channel 18 of the primary body 12. Such gradual dis- placement will occur at least until the open end 40 passes at least minimally beyond the seal means 24 to the point where the fluid tight seal therebetween is broken. At this point there will be some at least minimal and controlled escape of the fluid under pressure between the exterior surface of the conduit 38 and the interior surface of the primary body 12 as indicated by the directional arrows of Figure 5B. An expansion chamber or space 49 is formed as shown in Figure 5B and will receive the escaping fluid. The larger dimensional features of the expansion chamber 49 will serve to further dissipate the pressurized fluid and somewhat reduce the

"escape pressure" of the fluid as it passes beyond the fingers and exits the coupling over the exterior surface of the con-

duit. Complete detachment of the retaining member 14 from the primary body 12 will cause a complete separation of and opening of the coupling and an eventual disconnection, in the aforementioned slow mode, of the conduit 38 from the coupling generally as 10.

Other structural features of the present invention include various embodiments of the stop member. More spe¬ cifically in Figure 6 the stop member is in the form of an annular recess 45 formed in the exterior surface 38' of the conduit. This differs from the embodiment of Figure 1 where the stop member is an outwardly extending annularly configur rim or ring.

It should be noted that in the embodiment of Figur 6the length or longitudinal dimension of the retaining fingers 28 must be sufficient to position distal end 44 thereof into abutting, interruptive engagement down into the recess 45 so as to prevent the inadvertent removal of the conduit 38 along the direction of travel of the pressur¬ ized fluid. Figure 7 represents a safety feature wherein the stop member includes a first.outwardly projecting ring 42 and a second outwardly projecting ring 42' spaced therefrom along the length of the conduit 38''. When the conduit 38' ' is in its locked or connected position the distal end 44 of the finger 28 will lockingly engage the first stop member 42. Upon the aforementioned external and opposing forces being applied to the respective arms 32 in the manner shown in Figure 3B the respective fingers 28 will pivot out of engagement with the first stop member 42 and automatically come into abutting, interruptive engagement with the second stop member 42'. This acts as a safety measure wherein inadvertent quick detachment of the conduit 38' ' is attempted under high pressure conditions.

Figure 8 is yet another embodiment of the present invention wherein the retaining member 14' is formed of an integral one piece metallic material of continuous length such that a main portion 60 is fixedly secured as by a

spot weld 62 to the exterior of the primary body portion 12. An inwardly crimped skirt 63 is positioned into an inte¬ grally formed groove formed on the exterior of the pri¬ mary body portion 12 as shown in Figure 8. The remainder or arm 64 is of sufficient length to be folded upon itself so as to form a folded over portion 64, 66 which are spot welded or otherwise permanently secured together as at 68. The retaining finger 70 is formed by the distal end of the folded over portion 64, 66 in abutting, interruptive engage- ment with the stop member 42 of the conduit 38 as explained above. In the embodiment shown in Figure 8 the coupling does not have the feature or advantage of the slow discon¬ nect mode of operation.

Figure 9 is yet another embodiment of the present invention wherein the plurality of arms 32 include at least two arms (only one shown in Figure 9 for purposes of clarity) each having a retaining finger 28 ^r positioned a first dis¬ tance from the primary body 12 so as to be positioned in abutting, interruptive engagement with the '.top member 42 of conduit 38 when the conduit 38 is in its connected position as shown in Figure 9. -

However, a second finger schematically represented in Figure 9 as 28" is spaced a second distance from the pri- mary body 12 wherein such second distance is lesser than the first distance. More specifically, the retaining fingers 28 are disposed a greater distance from the stop member 42 than the first fingers 28'. Accordingly, the arms 32 to which the retaining fingers 28' are attached must first be depressed to release the stop member therefrom. The stop member 42 then passes into engagement with the second "downstream" pair of retaining fingers 28. Additional external force is applied to the arms 32 holding the second set of fingers 28' must be applied in order to totally release the conduit 38 and specifically the stop member 42 from both sets of fing- ers 28 and 28". It is readily seen therefore that the embodi¬ ment of Figure 9 serves as a safeguard again, where a quick disconnect coupling is attempted inadvertently under high pressure conditions.