Ledge forming system for producing a conjunct nozzle

Abstract

A novel ledge forming system used to attach a polymer retention hub to a thin wall nozzle core to provide an efficient way to produce a conjunct nozzle. The inventive apparatus provides a means for assembly of components by a method involving use of a press with a heating element to elevate temperature of a thermoplastic polymer to permit formation of a ledge that overhangs the flange of a nozzle core, mechanically locking components together. Execution of the process is rapid, low cost and eliminates damage to the thin wall of the core that would occur if the polymer retention hub were molded around the nozzle core.

Claims

1. A forming tool apparatus for a press having a heating element, comprising: a) a cylindrical housing with a deep counter-bore on one end having a shallow circular depression opposite end of said deep counter-bore and a small diameter hole through a wall in-between each end that separates said deep counter-bore end from said shallow circular depression end; b) a button with a large diameter side and a small diameter side slideably fit inside said deep counter-bore end and into said small diameter hole; c) a force compliant member fit inside said deep counter-bore end presses against said button on said large diameter side; d) a threaded cap fit into said deep counter-bore end pushes against said force compliant member; and e) a support block below that contains a nest having a through hole located in center of said nest.

2. The forming tool apparatus for the press having the heating element of claim 1, wherein said cylindrical housing is made of a metal known to be highly thermally conductive.

3. The forming tool apparatus for the press having the heating element of claim 1, wherein said button is made of non-thermally conductive material.

4. The forming tool apparatus for the press having the heating element of claim 1, wherein components of said cylindrical housing and said support block having said nest are coaxially aligned.

5. The forming tool apparatus for the press having the heating element of claim 1, wherein said small diameter side of said button is configured to provide means to limit size of surrounding softened polymer.

6. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub and a restraint wherein said nest is configured to slideably fit said polymer retention hub and said polymer retention hub is constrained by said restraint.

7. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub having a circular shaped fossa bottom and a thin wall nozzle core having an exterior flare wall, wherein said nest is configured to insert said polymer retention hub, said polymer retention hub is configured to insert said thin wall nozzle core, said press having means to push said thin wall nozzle core downward into said polymer retention hub until said exterior flare wall is coincident to said circular shaped fossa bottom.

8. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub, a lower portion thereof having a cross sectional profile shape and a taper terminus protruding, wherein said nest is configured to have sides adjacent to said cross sectional profile shape of said lower portion of a polymer retention hub and generous relief at corners to fit said polymer retention hub and that said through hole in center of said nest is concentrically aligned with said polymer retention hub.

9. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub, an upper portion thereof having a salient cusp and a nozzle core fitted having an interior upper flared opening radius, wherein said heating element contiguous with said cylindrical housing on said press having means to raise said heating element to an elevated temperature and means to apply force downward onto said polymer retention hub having said salient cusp, until said button deflects said force compliant member depressing said button against said interior upper flared opening radius on said nozzle core.

10. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub, an upper portion thereof having a salient cusp, wherein said polymer retention device having said salient cusp is heated from contact with said shallow circular depression end of said cylindrical housing having means to contiguously attach to said heating element and wherein urging of said press directs softened polymer material of said salient cusp around said small diameter of said button.

11. The forming tool apparatus for the press having the heating element of claim 1, further including a polymer retention hub, an upper portion thereof having a salient cusp, wherein retraction of said cylindrical housing extends said button thereby assisting separation of said shallow circular depression from contact with said salient cusp on said polymer retention hub.

12. The forming tool apparatus for the press having the heating element of claim 1, further including a conjunct nozzle, wherein retraction of said cylindrical housing after use exposes said nest thereby permitting removal of said conjunct nozzle.

13. A ledge form tool apparatus for a press having a heating element, comprising: a) a means to mount said heating element contiguously to a thermally conductive hollow cylindrical housing to provide a heated hollow cylinder on said press, said heated hollow cylinder has a shallow circular depression on one end; b) a shut-off button having a large diameter and a small diameter that has a close clearance slidable fit in a small diameter hole located through said shallow circular depression; c) a deep counter-bore end having a force compliant member sandwiched between a threaded cap and said large diameter of said shut-off button; and d) a means to mount a support block having a nest suitably sized to contain a polymer retention device and support a fundus on said polymer retention device, said polymer retention device having a salient circular cusp section extending upward from where a shaped circular fossa originates, said salient circular cusp positioned below said shallow circular depression on said heated hollow cylinder.

14. The ledge form tool apparatus for the press having the heating element of claim 13, wherein said support block with said nest mounted under said heated hollow cylinder fixes said polymer retention device to have support for said fundus on said polymer retention device in said nest in a concentric manner relative to said shallow circular depression.

15. The ledge form tool apparatus for the press having the heating element of claim 13, further including a shaped edge of a solidified profile of a ledge on a conjunct nozzle, wherein formation of said shaped edge of said solidified profile of said ledge by means of said smaller diameter of said shut-off button is a measured size for deliberate connection of said conjunct nozzle in service.

16. The ledge form tool apparatus for the press having the heating element of claim 13, further including a nozzle core having a nozzle core flange, wherein said force compliant member pushes against said shut-off button contacting said nozzle core flange having said shut-off button extend and apply a load to said nozzle core flange to seat said nozzle core in said polymer retention device by means of said press.

17. The ledge form tool apparatus for the press having the heating element of claim 13, further including a nozzle core flange on a nozzle core, wherein said force compliant member yields having said shut-off button contacting said nozzle core flange retract and said shallow circular depression transfer heat and apply load to said salient circular cusp on said polymer retention device by means of said press.

18. The ledge form tool apparatus for the press having the heating element of claim 13, wherein means to withdraw said heated hollow cylinder following forming of said salient circular cusp on said polymer retention device is arranged, permitting said force compliant member inside to recover from yield and extend said shut-off button contacting said nozzle core flange thereby aiding separation.

19. The ledge form tool apparatus for the press having the heating element of claim 13, wherein said support block configured to contain said nest further includes, a concave shaped cavity having sides that are adjacent to a cross sectional profile shape established by a square shape cross section of a lower portion of said polymer retention device and wherein shaped geometry other than said square shape cross section used to establish said lower portion of said polymer retention device entails configuration of said concave adjacent sides of said nest to said cross sectional profile shape of said shaped geometry other than said square shape cross section.

20. A method of operation of a ledge-form tool apparatus, comprising: a) providing a polymer retention device comprising a square shape cross section portion having corner radii extending downward to a fundus having a cylindrical relief, extending upward to a tapered hollow portion that continues rising to a shaped circular fossa that is surrounded by a salient cusp portion having a contiguous thread twisting downward around an outside perimeter with a minimum root diameter portion that forms said corner radii; b) providing a thin wall nozzle core comprising an interior nozzle core flange radius portion and an exterior flare wall portion that forms a flange, extending downward to an exterior shaped barrel wall portion that extends further downward to an exterior conically shaped wall portion attached to a taper terminus; c) providing said ledge-form tool apparatus for a press having a heating element comprising a device for a support block containing a nest arranged to form a concave geometry having sides adjacent to a cross sectional profile shape of a lower portion of said polymer retention device and a generous relief around corners, said nest providing a hole extending through said support block and a device for contiguous connection of a shaped metallic rod to said heating element over said nest, having a deep-counter bore and a threaded cap on one side and a button having a large diameter side and a small diameter side, said small diameter side fit through a small diameter hole located in a shallow shaped circular depression, said button protruding opposite of said deep-counter bore side and a force compliant member sandwiched between said threaded cap and large diameter side of said button; d) inserting said polymer retention device into said nest; e) inserting said thin wall nozzle core into said polymer retention device; f) advancing said shaped metallic rod at an elevated temperature downward having said button pushing against said interior nozzle core flange radius and seating said exterior flare wall in said shaped circular fossa; g) forcing said force compliant member to yield and retract said button for said shallow shaped circular depression to load said salient cusp; h) re-flowing softened polymer of said salient cusp inward around said button; i) retraction of said shaped metallic rod and extension of said force compliant member and said button; whereby said press having said heating element is configured having means embedded therein, for causing control of thermal energy and load limiting operation for a measured forming management of said salient cusp on said polymer retention device to produce a conjunct nozzle.

21. The method of operation of the ledge-form tool apparatus of claim 20, wherein said control is configured to cause a sequence of operations for said measured forming management to process said conjunct nozzle, said polymer retention device is fitted into said nest in said support block, said thin walled core is inserted into said polymer retention device, advance of said shaped metallic rod having said button contact said interior nozzle core flange radius driving said thin walled core and said polymer retention device together, retracting said button by compressing said force compliant member for contact of said shallow shaped circular depression at elevated temperature to said salient cusp for means of said measured forming management of a ledge, retraction of said shaped metallic rod to extend said force compliant member and cause protrusion of said button thereby causing separation for removal of said conjunct nozzle.

Description

DESCRIPTION OF THE DRAWINGSFIGURES

[0034] Turning now to the drawings wherein elements are identified by numbers and like elements are identified by like numbers throughout the seven figures, a drawing of the nozzle core with a partial cut away at the top and close up cut away A of the bottom of the nozzle is depicted in FIG. 1.

[0035] FIG. 2 is an illustrative view of the polymer retention device from a vantage point looking downward at an angle and a view looking directly at the fundus of the retention device;

[0036] FIG. 3 is an illustrative view of a nozzle core being manipulated into a cut away view of the polymer retention device seated in a support block;

[0037] FIG. 4 is a sectional cut away view of the nozzle core as a load is directed and it is pressed into the polymer retention device seated in the support block;

[0038] FIG. 5 is a sectional cut away view of the polymer retention device seated in a support block at the end of the assembly cycle with shut off button depressed and ledge profile formed over the nozzle core flange;

[0039] FIG. 6 is a front view of the assembly system components necessary to perform the process of connection of polymer retention hub to nozzle core;

[0040] FIG. 7 is a cut away section view of a conjunct nozzle showing illustrative details of connection;

[0041] FIG. 8 is an illustrative view of the finished polymer retention device permanently fastened to the nozzle core to form a unitized or conjunct nozzle looking downward from an elevated vantage point downward.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0042] Referring now to the drawings wherein the showings are for the purpose of illustrating preferred embodiments of the invention only and not for the purpose of limiting it. The invention is a novel manner of creating and a technique of assembling a conjunct nozzle 24 of which the outcome is depicted in FIG. 8. FIG. 1 shows the thin wall nozzle core 1 in a vertical, attitude, as it would be inserted and captured in a retention device 8 and used in service in the industry. The deep drawing process is used to produce the core 1 that is depicted in the illustration. A thin walled deep drawn nozzle core 1 has a tapered exterior cylindrical wall 2 parallel to the angle formed by a standard luer taper as is known in the prior art. Exterior cylindrically shaped barrel wall 2 or exterior shaped barrel wall 2 extends downward to an exterior conically shaped wall 32 that is attached to a taper terminus 5. Terminus 5 is extruded downward to the extent the structure necessary to form an exit aperture 30 is provided. Cores 1 are designed with an exterior flare wall 3 that forms the basis for a flange 4. The interior nozzle core flange radius 6 provides a nozzle core 1 interior surface that enables a shut-off button 20 to locate, seat and activate to supply downward force necessary for prevention of re-flowed polymer from entering and blocking the interior cylindrically shaped barrel wall 7. This ensures an interior thin tapered wall 7 that mates with a standard luer taper as is known in the prior art is free of contaminates that would cause unwanted extrication of fluid through the standard luer taper from transmission pressure due to an interruption of mating sealing surfaces. Contact of the shut-off button 20 against the interior upper flared opening radius 6 also allows formation of the shaped edge 23 of the cantilevered solidified profile formed by re-flow of the salient cusp 9.

[0043] FIG. 2 is a view of the polymer retention device 8 in a vertical orientation as produced by the plastic injection molding process as is known in the prior art before insertion of a thin wall nozzle core 1. A shaped circular fossa 10 is conjoined to the top of the conically shaped cavity 11 that extends down to a cylindrical relief 33 that cuts through the remainder of the polymer hub 8 breaking out through the fundus 14 center. Interior edge relief 26 of the fossa 10 that is adjacent to the tapered cylinder shaped hollow 11 is relieved by installation of a interior edge chamfer 26 that prevents exterior flare wall radius 3 from interfering with the coincident relationship of exterior flare wall 3 with circular shaped fossa bottom 27. A circular shaped cusp 9 extends upward from the surface the shaped circular fossa 10 originates. Width of the cross section and height of the circular shaped cusp 9 is a function of the volume required to form an invaginated cavity 18 with a thickness substantial enough to support a load equivalent to the force required to separate the core 1 from the standard luer taper that connects it to the source of fluid. Volume of the formed or solidified profile that supports the required force for separation is equal to the volume as molded of the circular shaped cusp 9. Separation force great enough to pull the seated nozzle core 1 from the standard luer taper is generated by means of a radial inclined plane 12 around the circumference of the polymer hub 8.

[0044] Below the contiguous thread 12 is a square shape cross section 13 that could be designed as a round, triangular, pentagonal, hexagonal, octagonal or other shaped cross sectional geometry. A square shaped cross section 13 is selected to provide a means to apply additional torque to the polymer retention device 8 to maximize flat length for the small size of the retention device 8 that surrounds the nozzle core 1 to facilitate application of torque away from the weaker corner radii 31 to the center of the flat of the square cross section 13 where strength is greater for a polymer hub 8.

[0045] A fundus 14 is formed with corner radii 31 that are the result of the fundus 14 circumscribed by the minimum root diameter 34 of the thread 12. The fundus 14 has a profile that is flat and parallel to the top of the circularly shaped cusp 9 that extends upward from where the fossa 10 originates. However, the fundus 14 can assume radial or conical profiles that are other than flat or parallel to the salient cusp 9.

[0046] The sequence of steps required assembling and forming the connection between the polymer retention device 8 and the nozzle core 1 is a key aspect to the novel method of manufacturing a unitized nozzle assembly 24. To accurately show the order of operations required, FIGS. 3, 4, 5 are displayed as cut away views of each step that is required to make the connection with the process.

[0047] FIG. 3 is a partial cut away illustration of the first step in the manufacture of the conjunct nozzle 24. To make a connection between the polymer hub 8 and the nozzle core 1, support of the flat fundus 14 is required, this is accomplished by placing the polymer hub 8 or core retention device 8 into a cylindrical cavity 16 or counter-bore 16 that circumscribes the square cross section 13 that forms the lower portion of the polymer retention hub 8 in a support block 15 with a through hole 17. A core 1 is inserted in the direction indicated by the arrow into the tapered hollow 11 in the polymer hub 8.

[0048] FIG. 4 shows application of a load to the core 1 that is sufficient to seat the exterior flare wall 3 into the shaped circular fossa 10. Load is applied until the exterior flare wall 3 is seated against the circular shaped fossa bottom 27 such that interior edge chamfer 26 does not impede the coincident relationship. This forces the tapered hollow 11 of the polymer hub 8 to expand outward creating pressure acting inward. The pressure exerted is a function of the elastic behavior of the polymer. Appropriate tolerances enable expansion within the elastic limit of the material to provide a force that grips the cylindrically shaped tapered wall 2 of the core 1 and helps to inhibit rotation in service when the unitized polymer hub nozzle assembly 24 is installed and removed from standard luer tapers. A hole 17 in the center of the counter-bore 16 that extends through the support block 15 provides clearance required for the protruding portion of the taper terminus 5 to reside. This protects cores 1 by preventing unintended impact and damage that can result during formation of the enclosed cavity 18 around the core flange 4.

[0049] FIG. 5 depicts the last step in the process of formation of the connection of the polymer retention device 8 to the thin walled deep drawn nozzle core 1. Support of the polymer hub 8 is achieved by insertion into the cylindrical cavity 16 contained in the support block 15. The through hole 17 prevents unintended impact and damage to the terminus 5 of the thin wall nozzle core 1 that results during formation of the invaginated cavity 18 around the core flange 4. Counter bore 16 with a hole 17 in a support block 15 is aligned in a concentric manner to the ledge form tool 19 thereby enabling the retention device 8 to locate suitably within the counter-bore 16 and allow the thin walled core 1 to maintain concentricity. This ensures the ledge-form tool 19 will operate correctly and the button 20 will make contact in the required location on the tapered interior cylindrical wall 7 of the thin walled deep drawn nozzle core 1. Force and thermal energy is applied to the forming tool 19 through the cylindrical housing 25 by a thermal press or some other such device as is known in the prior art.

[0050] The ledge-form tool assembly 19 is heated and made from highly thermally conductive metal that forms a heated hollow cylinder 25 and contains a spring-loaded button 20 made of non-thermally conductive material. Cylindrical housing 25 contains a deep counter-bore 35 that provides a cavity to contain a force compliant member 21 and a shallow circular depression 36 on the opposite side. A small diameter hole 37 provides the necessary geometry for fit of a button 20. Button 20 articulation is inward against a force compliant member 21 that pushes against a threaded cap 28 and supplies a downward load against the interior radius of the nozzle core flange 6 to provide a shut off that prevents excess melted polymer from ingress into the tapered interior cylindrical wall 7. Shut-off button 20 action not only prevents sealing failure from contaminate occupation between mating taper surfaces when components are connected eventually in service but it also provides an interior wall to direct the softened polymer to form the interior shape of the edge or shaped edge 23 to the solidified profile. The button 20 also provides force to aid separation upon completion of formation of the overhang 22. Sacrifice of the salient circular cusp 9 during this procedure is made to provide the softened polymer material volume required for re-flow to produce a ledge 22 that forms an overhang 22 to produce the enclosed cavity 18 to trap the nozzle core flange 4. The top of the core flange 4 is adjacent to the underside of the overhung ledge 22 that serves to lock the top of the nozzle core flange 4 into the polymer retention device 8. Solidification produces a ledge 22 with a top surface that is parallel to the fundus 14.

[0051] FIG. 6 is a front view illustration of tools, component parts of the design, force and energy required to initiate forming the unitized nozzle 24. Each of the elements used in the process are arranged in a serial fashion to denote the sequential nature of the operation. The load required to generate pressure substantial enough to re-flow the polymer softened by exposure to the elevated temperature of the ledge form tool 19 is shown schematically using a vertically oriented arrow labeled load and two horizontal arrows labeled heat. Energy is applied to the top of the thermally conductive hollow cylindrical housing 25 the form tool 19 is constructed from. The threaded cap 28 contains the force compliant member 21 to provide a solid structure for the force compliant member 21 used to energize the button 20 to push against interior radius of nozzle core flange 6. A clamp 29 aids separation of a newly formed conjunct nozzle 24 from the spring-loaded button 20 of the ledge-form tool 19. Implementing a restraint 29 ensures a newly formed conjunct nozzle assembly 24 is not lifted from the block 15 in an uncontrolled fashion and damaged inadvertently at the end of the operation. Restraint can be accomplished by translation of a clamp 29 mounted at the top of the support block 15 for lock up of radial inclined plane 12 preventing pull out of conjunct nozzle 24 from nest 16 or by exertion of force against a face of the square shaped cross section 13 or a corner radius 31 of polymer hub 8 shaped as a round, triangular, square, pentagonal, hexagonal, octagonal or other shaped geometry to form an alternate cross section for a nozzle 24 against a datum surface or side wall in a counter bore 16 that is round, triangular, square, pentagonal, hexagonal, octagonal or other shaped geometry. Retraction of the shaped metallic rod 19 leaves a conjunct nozzle 24 trapped by a restraint 29 in the block 15, withdrawal of the clamp 29 and removal of a finished conjunct nozzle assembly 24 completes the operation.

[0052] FIG. 7 is a full section view of a complete conjunct nozzle 24. Core 1 is captured in the polymer retention hub 8 by the overhung ledge 22 that forms an invaginated cavity 18. A shaped edge 23 is produced upon retraction of the shut off button 20 from the upper flared opening 6 as shaped metallic rod 19 withdrawals after completion of the forming operation.

[0053] FIG. 8 is a pictorial representation of a finished unitized nozzle assembly 24 from a slightly elevated vantage point looking downward. A unitized polymer nozzle 24 has a polymer hub 8 permanently attached to the nozzle core 1. The nozzle 24 is pointing downward as it would most likely be used in service in the industry. Conjunct nozzle 24 sizes are denoted by a discrete polymer retention hub 8 color for each thin walled nozzle core 1 corresponding with a unique exit aperture size 30. Manufacture of the nozzle assembly 24 using this method is easily automated and is accomplished without the use of adhesive that slows the process and elevates risk of contamination though migration of excess adhesive by misapplication.

[0054] While the invention has been described with reference to a particular embodiment thereof, those skilled in the art will be able to make various modifications to the described embodiment of the Invention without departing from the true spirit and scope thereof. It is intended that all combinations of elements and steps, which perform substantially, the same function in substantially the same way to achieve substantially the same result, be within the scope of this invention.