WO2024030767A1

WO2024030767A1 - Spring retention cup for injection mold assembly and method of use

Info

Publication number: WO2024030767A1
Application number: PCT/US2023/070734
Authority: WO
Inventors: Richard NEURURER
Original assignee: Neururer Richard
Priority date: 2022-07-21
Filing date: 2023-07-21
Publication date: 2024-02-08

Abstract

An improved method and associated spring retention cup device for use in the assembly of pre-loaded ejector pins within a plate of an injection mold assembly. The device includes structures and method of use for capturing a compression spring between a first plate of an injection mold assembly and at least a second plate with the first plate and the second plate in a biased assembly. The device and method enable the compression springs within a mold assembly to be placed within the device and secured as a last step in mold assembly.

Description

SPRING RETENTION CUP FOR INJECTION MOLD ASSEMBLY AND METHOD OF USE

RICHARD NEURURER

SPECIFICATION

CROSS-REFERENCE

[0001] This application claims priority to the US Provisional Patent Application No 63/391,143, filed on July 21, 2022 and the US Provisional Patent Application No 63/404,591 filed on September 08, 2022 to the above-named inventor. The disclosure of which is incorporated by reference in its entirety.

FIELD OF THE INVENTION

[0002] This invention relates generally to a new and improved device for use in a spring- loaded ejector system within an injection mold assembly and a method for use of thedevice. More particularly this device is useful for completing a mold assembly that allows for the placement of any springs within the mold assembly as the last step.

BACKGROUND

[0003] Within the injection mold industry, it is common to use a spring-loaded ejector system. In a typical injection mold method of use, after a quantity of molten plastic enters the mold and then cools, the ejector plates and ejector pins advance into the mold cavity and eject the molded product (often called a part) from the mold. After ejection of the part, the next sequence is the return of the ejector plates and ejector pins from their advanced position. Typically, this return process is completed through the use of mechanical springs in the spring- loaded ejector system.

[0004] In a first typical mold assembly utilizing a spring-loaded ejector pin assembly (FIGS. 2- 3), a shoulder bolt is used to capture a spring between the ejector plate. To allow for spring placement as a last step in the mold assembly process, this shoulder bolt is received through an upper plate and within an interior of a coiled spring and secured to an ejector plate. This assembly allows for the use of the compressive forces of the spring to return the ejector plate and ejector pins to an original position after part removal. Although generally useful, this first assembly method is problematic as it uses valuable space on an upper portion of the mold that could be used for additional cavity detail, inserts, water, extra features, and the size of the mold generally needs to be increased to make the mold larger to accommodate the springs. Additionally, if the shoulder bolt retaining the spring would break or become loose, it could fall out on the parting line where the part is formed and if the mold is closed, it would cause major damage and down time on the mold during part production.

[0005] In a second typical mold assembly utilizing a spring-loaded ejector pin assembly (e.g., FIG. 3), the spring preload is required to be assembled first and then retained with a clamp or a shoulder bolt as is indicated in the figure. Although generally useful, this second assembly method is problematic as one is not able to assemble the mold with the ejector plate flush with a b-plate; this makes it difficult for the operator to assemble the ejector pins. This can be especially difficult and time consuming in certain molds as it is common for a mold to include up to 100 small and intricate ejector pins. Further, the operator is not able to check by hand if the ejector system will move freely because of the pressure from the preloaded springs. Further yet, valuable space in the upper portion of the mold is utilized for the spring and shoulder bolt. Still further, a mold designer is not able to take advantage of the lower space which is usually open with much more available space in alternate preloaded assemblies.

[0006] Therefore, a need exists for an improved preload assembly and associated device for allowing this preload assembly. Preferably this method and associated device allows for the ejector retainer plate to be flush with the b-plate for easy assembly and placement of the ejector pins, it may be assembled in the bottom area of the mold where there is more space available, because it is assembled last the assembler/operator would be able to test the ejector system by hand to confirm it is sliding back and forth smoothly, and lastly it may also be assembled in the back of the mold to minimize the risk of something breaking and smashing where the part is formed.

BRIEF SUMMARY OF THE INVENTION

[0007] In one aspect, this disclosure is related to an improved method and associated device for use in the assembly of pre-loaded ejector pins within a plate of an injection mold assembly. In another aspect, this disclosure relates to a spring retention cup configured for placement on a first plate of an injection mold assembly for retaining a compression spring between at least a second plate and the first plate in a biased assembly.

[0008] The invention now will be described more fully hereinafter with reference to the accompanying drawings, which are intended to be read in conjunction with both thissummary, the detailed description and any preferred and/or particular embodiments specifically discussed or otherwise disclosed. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of illustration only and so that this disclosure will be thorough, complete and will fully convey the full scope of the invention to those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a cross-sectional views of an injection mold assembly showing afirst assembly method for the placement of preloaded ejector pins, compression member, spring cup, and securing member within an ejector plate, according to the present disclosure;

[0010] FIG. 2 a cross-sectional views of an injection assembly within an ejector plate, as is common in the prior art;

[0011] FIG. 3 is an isometric view of a completed injection mold assembly showing a first assembly method for the placement of preloaded ejector pins within an ejector plate, as is common in the prior art; [0012] FIGS. 4A and 4B are a cross-sectional view of the mold with a spring retainer front mount, according to the present disclosure;

[0013] FIG. 5 is a cross-sectional view of the spring retention cup device within a mold assembly with a back mount, according to the present disclosure;

[0014] FIG. 6 is an exploded view and exploded cross-sectional view of the spring retention cup device with threaded inserts, according to the present disclosure;

[0015] FIGS. 7A, 7B, 7C, and 7D are a cross-sectional view and an expanded view of a spring alternative 2 piece retention device, according to the present disclosure;

[0016] FIGS. 8A and 8B are a cross-sectional view of an exemplary injection mold assembly withthe spring retention cup device a return pins or rods, according to the present disclosure;

[0017] FIGS. 9A, 9B, and 9C are a cross-sectional view and exploded view of the exemplary injection mold assembly, FIG. 9B is the exploded view of FIG. 9A and FIG. 9C is the spring retainer that secures or locks the spring in place, according to the presentdisclosure;

[0018] FIG. 10 is a cross-sectional view of the spring retention device with an injection molding machine and knock out rods, according to the present disclosure;

[0019] FIG. 11 is an exploded cross-sectional view of the spring retention device with an alternate design, according to the present disclosure;

[0020] FIGS. 12A and 12B are a side and top view of an optional bolt with spring retention cup device and FIG. 12B is the exploded view of FIG. 12A, according to the present disclosure;

[0021] FIGS. 13A, 13B, and 13C are cross-sectional views of a spring finger or alternate design for the spring retention cup device, FIG. 13B is the expanded view of FIG. 13A and FIG. 13C is another view of the device, according to the present disclosure;

[0022] FIGS. 14A, 14B, and 14C are a cross-sectional view of alternate embodiments of the spring cup retention device using a float plate, according to the present disclosure;

[0023] FIGS. 15A, 15B, and 15C are a cross-sectional view of alternate embodiments of the spring cup retention device using a float plate, according to the present disclosure

[0024] FIG. 16 is the spring cup elements in various embodiments of the spring cup retention device, according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following detailed description includes references to the accompanying drawings, which forms a part of the detailed description. The drawings show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments, which are also referred to herein as "examples," are described in enough detail to enable those skilled in the art to practice the invention. The embodiments may be combined, other embodiments may be utilized, or structural, and logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense.

[0026] Before the present invention of this disclosure is described in such detail, however, it is to be understood that this invention is not limited to particular variations set forth and may, of course, vary. Various changes may be made to the invention described and equivalents may be substituted without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, process, process act(s) or step(s), to the objective(s), spirit, or scope of the present invention. All such modifications are intended to be within the scope of the disclosure made herein.

[0027] Unless otherwise indicated, the words and phrases presented in this document have their ordinary meanings to one of skill in the art. Such ordinary meanings can be obtained by reference to their use in the art and by reference to general and scientificdictionaries.

[0028] References in the specification to "one embodiment" indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. [0029] The following explanations of certain terms are meant to be illustrative rather than exhaustive. These terms have their ordinary meanings given by usage in the art and inaddition include the following explanations.

[0030] As used herein, the term "and/or" refers to any one of the items, any combinationof the items, or all of the items with which this term is associated.

[0031] As used herein, the singular forms "a," "an," and "the" include plural reference unless the context clearly dictates otherwise.

[0032] As used herein, the terms "include," "for example," "such as," and the like are used illustratively and are not intended to limit the present invention.

[0033] As used herein, the terms "preferred" and "preferably" refer to embodiments of the invention that may afford certain benefits, under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances.

[0034] Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful and is not intended to exclude other embodiments from the scope of the invention.

[0035] As used herein, the terms "front," "back," "rear," "upper," "lower," "right," and "left" in this description are merely used to identify the various elements as they are oriented in the FIGS, with "front," "back," and "rear" being relative to the apparatus. These terms are not meant to limit the elements that they describe, as the various elements may be oriented differently in various applications.

[0036] As used herein, the term "coupled" means the joining of two members directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another. Such joining may be permanent in nature or alternatively may be removable or releasable in nature. Similarly, coupled can refer to a two member or elements being in communicatively coupled, wherein the two elements may be electronically, through various means, such as a metallic wire, wireless network, optical fiber, or other medium and methods.

[0037] It will be understood that, although the terms first, second, etc. may be used hereinto describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the teachings of the disclosure.

[0038] Referring now to FIGS. 1 through 16 of a spring cup retention device and alternate embodiments and method for use of the device in an injection mold assembly. The device is generally described as a fastening element specifically configured for placement in a mold assembly to retain a compression spring 116 in coupling to a plate for manipulating an ejectorpin within mold assembly 5. Accordingly, the device provides a method for manufacturing a spring-loaded ejector pin assembly with the tensioning of the spring being one of the later steps in mold assembly 5. The ability to add the tensioning of the compression member 116 to the ejector plate as a last step in mold assembly is important to ensure proper alignment of the various plates and ensure proper placement of the ejector pins.

[0039] In pair of traditional assemblies as shown in FIGS. 2-3, a compression member in the form of a coiled spring is secured between an ejector plate and a b-plate of an injection mold assembly through the use of a shoulder bolt 123. This traditional assembly provides a spring-loaded ejector plate assembly but requires additional mold space and has several additional disadvantages previously discussed within the Background.

[0040] Referring now to FIGS. 1 and 4 through 12 of the spring cup retention device and method of use according to the present disclosure and generally referred to herein as "device 10" or "spring retention device 10" or "spring retention cup 10". FIG. 1 depicts device 10 inside an injection mold assembly 5. Device 10 most generally has a tubular shape, for instance a cylindrical tube, having a threaded portion 102 and a shoulder bolt 123, which is wider than threaded portion 102 and defining an interior space for the receipt of a compression member 116, a cap or threaded insert (see, e.g., FIG. 16) configured for receipt on an end of the treaded portion 102 opposite shoulder bolt 123, and an optional rod 114. Relative to threaded portion 102, shoulder 123 generally may project or extend perpendicular to coaxial length of device 10 and may function as an exterior interference during placement and use of device 10. Shoulder bolt 123 is wider and may act as a placement indicator when device 10, stopping when adjacent to the interior of mold assembly 5. Device 10 (also referred to in the provisional as tube 100) including a plurality of threads in threaded portion 102 along an exterior on the end opposite to shoulder bolt 123, threaded portion 102 configured to couple a cap (not in FIG. 1) and retain compression member 116 within the interior space of threaded portion 102. Accordingly, compression member 116 is configured for coaxial placement, such as along coaxial line 103 which indicates direction of placement, with the length of device 10 (also referred to as threaded tube 100 when some embodiments include threading or referring to the provisional disclosure) to bias the ejector plate relative to the additional mold plates of the injection mold assembly. Device 10 compression member 116 capturing features enables for the placement of compression member 116 within the mold assembly as a last step.

[0041] Device 10 in certain configurations may utilize at least one rod 114 for supporting the compression member 116 and overall device 10 integrity in situations as required. Rod 114 is generally provided in a diameter and length generally corresponding to a given need and sized for coupling within device 10. Rod 114 also guides and supports compression member 116. Compression member 116 is generally depicted as a compression spring as this will likely be the common compression member 116 type, although other similar and durable and resilient members may be utilized. In some embodiments, a second rod 124 may also be used for guiding and supporting compression member 116.

[0042] An assembly mold 5 can move for testing spring retention device 10, when compression member 116 and the assembly plate moves back and forth as the spring compresses and retracts. The motion tests if compression member 116 was placed in the correct location, and in some cases rod 114 are positioned in the right location. Compression motion may be coaxial, such as in the direction of an axis for instance compressing coaxially, such as along coaxial line 103, if there is an axis running through the cylindrical shape in through the length of the spring. A rear plate 106 can be placed on the mold assembly after testing compression member 116.

[0043] Mold assemblies generally can have different configurations and the spring retention device can work with more than one design. The present invention, however, allows for spring retention device 10 to be tested to determine location accuracy within mold assembly 5. In the instant embodiment of FIG. 1, the assembly has a second portion 106 that may be configured to receive spring retention device 10 (also referred to as "device 10" herein). A side rail 105 forms at least a portion of the side walls of mold assembly 5. Side rail 105 may keep a compression plate 107 within mold assembly 5, and compression plate 107 move within mold assembly 5, compressing compression member 116. A first portion 101, which in some instances may be a plate member, that is located opposite of a second portion 106. The advantage of the instant invention, is testing the placement of the rod, compression member etc., before mold is closed and during use. Generally, compression plates of this invention can be a plate, disk, extension, bar, rod, or any shape that move within assembly mold 5 and contacts and compresses compression member 116.

[0044] In some instances, mold assembly 5 may have side rail 105, a first portion 101, that may include a front load removable plate, and a middle plate 109. A compression plate 107 may be movable within mold assembly 5, compressing at least one compression member 116. A second portion 106, such as a rear load plate, may be mounted on the end opposite first portion 101. Second portion 106 may be configured to receive compression plate 107 through at least one hallowed portion 108 in second portion 106. Compression plate 107 may also be configured to have at least one access portion 108 that is aligned with hallow portion 108 of second portion 106, so that compression member 116 may be inserted through access portion 108 and of second portion 106. Access portion 108 is an area where the material of mold assembly 5 forms around, so that there is an opening or channel formed and configured so compression member 116 can fit through or pass through, creating a tubular shape. In this way, placement of compression member 116 may be tested after insertion into mold assembly 5, to test the location and placement of the spring ejections elements, such as compression member 116 and rod 114. In some embodiments, to further assist inserting compression member 116, rod 114 may be placed in either the assembly mold 5 or in device 10, so that compression member 116 may slide over rod and into a configured recess shaped to receive device 10 and compression member 116. Rod 114 may abut or be inserted into a third portion 109, which may be an additional layer or plate, that secures rod 114 within a portion of mold assembly 5 configured to fit rod 114 (a rod recess 117) to direct and support coaxial movement of compression plate 107. [0045] Mold assembly 5 may include a recessed area 111 that is hollow, or mold assembly 5 forming around an area creating a receiving space 110, which is a recess portion creating a hole or area where the mold assembly 5 material forms around, and in some embodiments, generally bigger than the shape or circumference of device 10 and compression member 116, so that recessed area 111 is a shape large enough to receive at least device 10 into the recessed area. hollow portion configured to receive the device. Recess area 111 may have features that allow device 10 to be secured within mold assembly 5, such as threading on the side walls of recessed area 111 (such as threads 112) at least in the area adjacent to threaded portion 102 of device 10. In this way, device 10 may be securely rotated into a secure position. The threads of threaded portion 102 are configured to rotate within threaded walls 111 of recessed area 110. Device 10 may also have shoulder bolt 117, or in other words a wider portion configuring to fit within access portion 108 and abuts recessed area 110 preventing device 10 from being inserted too far. In some embodiments, rod 114 may also help position device 10, for a coaxial insertion through access portion 108, and prevents device 10 from being inserted too far withing mold assembly 5, when a second end of rod 114 (or second rod 124) abuts an end of device 10. Compression plate 107 may then be further secured with positioning rod 117. Positioning rod 117 and other form rods 119 may be included in the embodiment to create spacing or shapes for the form resulting from the mold. Positioning rod 117 and form rods 119 may also support the mold assembly 5 and compression plate 107, stabilizing compression plate 107 during ejection coaxial motion. In some embodiments, form rods 119 may help to move compression plate 107. Compression plate 107 may be next to a parallel member 115 that is parallel to compression plate 107 on one side and parallel to second portion 106 on the opposite side. In some embodiments, parallel member 115 may be compression plate 107, or separate plates. [0046] Compression member 116 is placed on device 10 such that when compression member 116 moves coaxially further into mold assembly 5, then compression member 116 may compress when pushed by the side of device 10. Compression member 116 may be separate from device 10 or attached to an end of device 10. In another embodiment, device 10 may be configured to receive compression member 116 within the cylindrical tube shape of device 10. In some instances, device 10 may have threading on the inner wall that are configured to allow compression member 116 to be rotated into device 10 engaging the threading. In other embodiments, compression member 116 may be attached to or within device 10, such as by welding, soldering, gluing, or other means.

[0047] In some instances, there may be a second device 120 that functions and similar configuration as device 10. Second device 120 may be additional means to secure and eject another compression member 116 that may be additional to compression member 116 associated with device 10, as described herein. [0048] When device 10 is inserted into securing insert 122. In some embodiments, securing insert 122 may be a bolt or pin or plug, etc. that would secure device 10 securely into mold assembly 5 and may remain secure during the ejection mold process of mold assembly 5. During testing of compression member 116 and compression plate 107, or when second portion 106 is secured in mold assembly 5. Other securing means are possible such as caps, plugs, screws, pins, and other securing means to hold devices 10 and 120 secured to mold assembly 5. In the embodiment of FIG. 1, a bolt is shown to coaxially secure within device 10 at an end opposite threaded portion 102. Securing means may be beneficial for improving that second portion 106 is secure and does not detach or loosen during ejection mold assembly use.

[0049] In this disclosure, different embodiments are part of the disclosure, more than is illustrated in FIG. 1. For example, device 10 may contain threading along the interior wall of device 10 may include threading for engaging a securing insert 122, compression member 116, rod 114, and any other component added to the spring retention system in mold assembly 5. These components, in addition to device 10, may also or alternately have threading on the outer side of the element for securing the element to another element or to mold assembly 5. Similarly, mold assembly 5 may include threading on an inner wall to secure the assembly with an element described herein or similarly.

[0050] The spring retention device of claim 1, further comprising threading on at least a portion of at least one of an outside wall, an inside wall, and a combination thereof. Spring retention cup device 10 and method for use, device 10 and its various parts can be provided in several alternate embodiments and structural assemblies without departing from the spirit of the main inventive concept of device 10. Accordingly, shoulder 123, which is a leading side of width on the exterior of device 10 can moved along the length or placed within an additional sleeve received on device 10. In yet another embodiment, device 10 features could be incorporated into a one-piece assembly, however, this assembly would require the plate receiving the device 10 to be drilled and tapped. Further, a cap or insert (not illustrated in FIG. 1) of the device 10 can be provided in host of alternate shapes and types and methods (some embodiments may be illustrated in FIG. 16) for placement and securing to mold assembly 5 and device 10 (see an embodiment in FIG. 6). In yet further alternates, device 10 could be replaced with a cap body or a threaded insert body and alternately device 10 could be provided in an assembly that is not threaded on an exterior surface, wherein the cap or threaded insert may be secured using alternate fastening means or types. Still further, as shown in FIGS. 9, 11-14 device 10 can be provided in an assembly wherein the fastener is adjacent to the compression/spring element and provided in an offset assembly.

[0051] While the invention has been described above in terms of specific embodiments, it is to be understood that the invention is not limited to these disclosed embodiments. Upon reading the teachings of this disclosure many modifications and other embodiments of the invention will come to mind of those skilled in the art to which this invention pertains, and which are intended to be and are covered by both this disclosure and the appended claims. It is indeed intended that the scope of the invention should be determined by proper interpretation and construction of the appended claims and their legal equivalents, as understood by those of skill in the art relying upon the disclosure in this specification and the attached drawings.

[0052] The present disclosure allows the plates to be placed on the mold assembly and then placing compression member 116 and device 10 into mold assembly 5. FIGS. 2 and 3 illustrate some ejection mold assembly systems that are known in the art, These mold assemblies have a closed back wall, so a spring or compression moment cannot be tested prior to closing it up instead of being configured for back loading of device 10 (FIG. 1). These known mold assemblies, such as mold assembly 210 of FIG. 1, not only lack spring cup devices that can be tested prior to the ejection mold assembly process, but they also generally lack recesses for loading for inserting devices, such as device 10 from FIG. 1, into the mold assembly and testing it. In the illustration of FIG. 2, second portion 240 may be the rear loading panel plate. In FIG. 2, second portion 240 may not include recess or open areas for inserting device 10, and thus, the entire assembly is opened to insert and device 10 could not be testing within mold assembly 210.

[0053] Spring loading as an earlier step may not allow without the configuration to test the placement and installation of a spring. In FIG. 3 illustrates a closed assembly similar to FIG. 2. A spring cup, such as device 10 of FIG. 1, is not illustrated, and thus, positioning testing is not present. Instead, there is a rod 310 inserted into a second or rear portion 320 and the system is closed.

[0054] The embodiments of the present disclosure may also allow for front loading and testing. In the embodiments of FIGS. 4A and 4B, a spring cup 410 the that configured to mount in the front of mold assembly 440. In the embodiment of FIG. 4A's exploded view that includes spring retainer 410 configured to receive spring 415. In this embodiment, second portion 450 is closed, but a front access with a first portion 420 shows spring 415 and cap 410 in coaxial alignment. Spring retainer 410 may be configured for front mounting, but this disclosure is not limited to front loading. Spring cap 410 allows for securing spring 415 as a last step and testing of spring 415 placement. Spring cap 410 may thread with the threaded walls of the assembly mold 440 of FIG 4A. FIG. 4B is an illustration of assembly mold 440 closed, and not exploded relative to FIG. 4A.

[0055] In the embodiments of FIGS. 5A and 5B, the spring retainer back mount system illustrated is an exploded view in FIG. 5A and the related closed view FIG. 5B. FIG. 5A illustrates an embodiment of a spring cap 550, or device 10 of FIG. 1, coupled to a spring 540, and accessing the internal portion of mold assembly 500 through access 585, of FIG. 5A. FIG. 5A also illustrates an expanded and rotated views of spring cap 555 in view box 580. A first side 565 couples with or is in contact with spring 540. View box 580 also has spring cap 550 illustrate in a rotated position as rotated spring cap 560, so that a second side 575, which is opposite of first side 565, is visible. FIG. 5B also illustrates a closed mold assembly 500, closed relative to the exploded view of the same mold assembly 500 in FIG. 5A. At least spring 540 (compression member) and spring cap 550 (device) are illustrated within a recess space 530 in FIG. 5B, showing how mold assembly 500 is configured to receive these elements. In one embodiment, mold assemble 500 of FIG. 5B may receive At least spring 540 (compression member) and spring cap 550 (device) through recesses of compression plate 590 and second portion 510 respectively, as described herein.

[0056] In some embodiments, spring cups may have a threaded portion and be received by a cap or a threaded insert. In the illustration of FIG. 6, a threaded insert 610 may be added to secure left device 640 within mold assembly 600 either additionally or alone. Threaded insert 610 has threading on an inner side, and in some embodiments not illustrated, threading may also be on the outer side. Left device 640 on the left side may illustrate the position within mold assembly 600 and a device 650 is the same as the left side device 640 positioned inside mold assembly 600, but rotated illustration of device 640 within the mold assembly 600, so that the threading is on the bottom or rotated 180 degrees. Device threaded insert 650 is illustrated to show how it is received by threaded insert 610. In this embodiment, the threading of threaded insert 610 compliments the threading of device 650, so that device threaded insert 650 may be screwed into threaded insert 610. Similar to the left side, the right side is rotated 180 degrees from the portion inside mold assembly 600.

[0057] In some embodiments, a two piece design may allow for the end step spring loading. FIGS. 7A, 7B, 7C, and 7D may illustrate an alternative embodiment that has at least two components, a spring cup and a cap. FIG. 7B is the exploded view of FIG. 7A. In this embodiment, FIG. 7B includes a two piece design alternative that may be utilized with a spring cup and a cap (see together 700). FIG. 7C may illustrate an example of a spring cup alternative 700. In FIG. 7C, the system may include a rod 730 fits in a spring cup 740 that may be configured to slide through spring cup 740 and a spring 750 (aka and generally a compression member) configured to slide over the rod within spring cup 740. In some instances, spring cup 740 may have threading on at least an outer side wall to couple to securing means to hold spring cup alternative 700 in place. In some instances, a bolt 760 may be configured to receive spring cup 740 and the threading of spring cup 740 may be located on the inner wall and configured to couple with the threading of bolt 760, which in some instances screws over spring cup 740. The relative threading location may be reversed from an inner to an outer wall, and reverse, so bolt 760 may screw inside of spring cup 740.

[0058] FIG. 7D is the cross-sectional view of FIG. 7C. However, threading of the components of FIG. 7C may be on another or additional side walls of the elements in the figure, so that they secure together when they are in an assembly mold 710. FIG. 7A shows spring cup alternative 700 inside mold assembly 710. FIG. 7B is an exploded view of mold assembly 720 and the same as mold assembly expanded mold assembly 710 in FIG. 7A. Specifically, FIG. 7B illustrates spring 750 and bolt 760 of spring cup alternative 700 exploded with a coaxial line of alignment illustrated.

[0059] There are other embodiments of the present invention. In the embodiment of FIG. 8A, spring cup device invention of this disclosure with return pins that may be used in the back mount design. Any back mount styles as described may be used with return pins. In the embodiment of FIG. 8A, return pin 810 is placed within a spring cup 830 through an opening or recess 820, and in some instance, pin 810 may couple with a rod 840 to improve securing the pin and holding the whole spring assembly in place within mold assembly 800. FIG. 8B is an embodiment of using a center rod to guide spring, such as a spring 860 that is configured to slide over or receive rod 850. [0060] Additional embodiments can be made to make the system a quick change system. FIGS. 9A, 9B, and 9C illustrate a quick change system that can test spring placement prior to use. In the embodiment of FIG. 9A, the system within mold assembly 950 may have at least two securing inserts 970 and 990. A first spring 960 may fit within spring cup 965 and spring 960 may be configured to slide within a recess 915 and slide over rod 935. Likewise, second spring cup 995 receives second securing insert 990 and spring 985 is configured to be places within second recess 925. In FIG. 9B, the mold assembly 950 may be further configured to receive a third spring 975 and be secured with a third spring cup 980. Third spring cup may include a rod or other placement guides. First and second springs 960 and 985 may align with rods, such as a rod 935 to guide the spring and support the system. FIG. 9C is an example of first spring cup 965 or second spring cup 995 or third spring cup 980 with threading on an outer wall and a shoulder to help place each spring cup in the correct location, preventing inserting spring cup 905 from being inserted too far as the shoulder of spring cup 905 is wider than the threaded portion and makes contact with a side of mold assembly 900 to limit further insertion. FIG. 9A further includes a normal mold assembly 900 which is the same mold assembly as FIG. 9B (element 950) and is not exploded. In the embodiment of FIG. 9A the non-exploded view (normal) illustrates an embodiment with pins 910 and 930 inserted and spring cup 920 between pins 910 and 930 without a pin.

[0061] Ejector mold machines may allow the final product to be removed from the mold assembly. FIG. 10 illustrates an embodiment of any back mound styles that may be located at the ejection mold knock out location. In FIG. 10, a mold assembly 1000 may include at least one knock out rod 1020 or extension for a knock out rod. Knock out rods may activate an ejector plate in a mold base, such as mold base 1010. A recess or open portion may be configured to receive injector rod 1020.

[0062] In another embodiment, another type of spring cup as described herein and in FIG. 11 that may have characteristics similar to that as described in FIGS. 9A and 9B. Shapes of a double securing insert spring cup 1100 may vary of FIG. 11. In the embodiment of FIG. 11, the elements appear in an exploded view and coaxially fit within a mold assembly 1100. A spring cup 1120 may have an oval shape, but other shapes are possible. In this embodiment, a first pin 1140 and a second pin 1130 fit within spring cup 1120. Mold assembly 1100 is configured to have an oval, or complimentary shaped opening (or recess), that can be configured to receive a possible third spring cup or securing insert (not illustrated in FIG. 11).

[0063] In other embodiments, spring cups can have other designs for receiving securing inserts. For example more than one securing insert 1220 may be used. FIGS. 12A and 12B illustrate an embodiment a spring cup 1210 that is similar to FIG.11. FIG. 12B is the exploded view of FIG. 12A. At least one securing insert 1220 may insert into spring cup 1210. In FIG. 12A, spring cup 1210 and double securing inserts 1220 are inserted into mold assembly 1200. Securing insert 1220 may be a bold or a pin or another type of securing means that holds spring cup 1210 into mold assembly 1200. [0064] FIGS. 13A and 13B illustrate a spring finger with rear mount installation. FIG. 13B is an exploded view of an assembly mold 1300 and FIG. 13A is a non-exploded view with spring finger 1370 of FIG. 13C installed in assembly mold 1300. In FIG. 13B, spring finger 1310 may illustrate that spring finger 1310 is configured to receive a securing insert 1320 on a first side and is further configured to receive a spring 1340 on the other second side 1330 adjacent to the first side. Mold assembly 1300 is configure to receive spring finger 1310 into a recess 1360, as illustrated in FIG. 13B. Mold assembly 1300 is configured to receive the elements within recesses 1350 of mold assembly 1300. FIG. 13A illustrates an embodiment of spring finger 1310 inserted with spring 1340 and securing insert 1320, all assembled in mold assembly 1300. FIG. 13C are different views of the configuration of spring finger 1310, such as a first side 1380 and a second side 1390, which is opposite of first side 1380.

[0065] In some embodiments, different bolt styles can be used to float a plate, in a top load system but others are also possible. FIGS. 14A, 14B, and 14C illustrate how to float a plate. In FIG. 14A, the plates are together with limited space between them and not floating. In FIG. 14B, there is a slight space 1420 between the plates. In FIG. 14C there is a first space 1430 and a second space 1440, so the plates are floating in two different places. The different securing insert styles may be used in the embodiment of FIGS. 14A, 14B, and 14C. In some embodiments, the invention disclosed herein may be used in a front load system, so that the spring cup and spring help to float the plates and can be compress when pressure is applied. [0066] In yet another embodiment, there may be another embodiment of floating plates, such as in FIGS. 15A, 15B, and 15C with the rear load system illustrated, but other loading is also possible with the disclosed invention. In FIG. 15A, a mold assembly 1500 is closed without floating plates, so that the plates are adjacent to one another. In FIG. 15B, a first spring 1502 and a second spring 1504 may expand, causing the plates to separate creating a larger space between them 1510, and the separation space 1510 is dependent on springs 1502 and 1504 expanding. FIG. 15C illustrates floating or separated plates in a first location 1540 and in a second location 1520. The second location also illustrates the rods 1530 separated from the plate of mold assembly 1500. [0067] FIG. 16 illustrates different embodiments of spring cups. This is not a complete list nor is it limiting as to the different varieties and shapes. Some of the spring cups may show alternative heads and shoulders. FIG. 16 may also include a type of spring cup for quick change. In some embodiments, spring cups can be combined with a threaded insert and be a two piece system. In other embodiments, spring cups can be one or more than one piece. In other embodiments, the assembly may include a spring retainer, a spring finger, have alternative shapes, and include a bolt on spring cup. FIG. 16 should just a few of many variations of spring cups and complimentary securing components.

[0068] The present invention of this disclosure has improved injection mold assemblies with a pass through design incorporating a recess for back loading. The cup and spring design may include threading on outside to hold compression member. In this way, the spring can thread into the cup or the cup is smooth or threaded. In other instances, spring may be placed on the surface of the cup. When the embodiment includes the spring finger design (cup or face versions) then the spring finger may include a double portion, or more than a double portion to receive the securing members and spring. In another embodiment, a face bolt may be used for evertop or securing insert. The present invention and design of the spring cup herein allows a use to test the location of the springs and function of the compression plate and spring(s).

Claims

CLAIMS What is claimed is:

1. A spring retention device for an injection mold assembly, comprising a main assembly portion that includes a recess portion for receiving a compression member and a securing portion, wherein the securing portion is removable so that the compression member can be placed coaxially in the recess portion and secured in place with the securing portion.

2. The spring retention device of claim 1, wherein the device is configured to be received through a recess of a back plate of the injection mold assembly.

3. The spring retention device of claim 1, further comprising threading on at least a portion of at least one of an outside wall, an inside wall, and a combination thereof.

4. The spring retention device of claim 1, further comprising a rear plate configured to receive the spring retention device with a portion having a first diameter, and a second portion having a second, larger diameter.

5. The spring retention device of claim 1, further comprising a rod to guide the compression member over the rod within a main portion of the assembly next to the rear plate.

6. The spring retention device of claim 1, further comprising a bolt for sec spring the spring retention device in place.

7. The spring retention device of claim 1, further comprising a threaded insert, for receiving the spring retention device.

8. The spring retention device of claim 1, further comprising threading on the inside of the recess for securing the spring retention device to the injection mold assembly.

9. The spring retention device of claim 1, further comprising threading on at least one of an outside wall of a cap, an inside wall of the cap, and a combination thereof.

10. The spring retention device of claim 1, further comprising a securing insert configured to fit within the device.

11. The spring retention device of claim 1, further comprising an ejector plate and knock out rods

12. The spring retention device of claim 1, is configured to have at least two recesses for receiving a securing insert.

13. The spring retention device of claim 1, further configured to receive at least one bolt configured to be received by the spring retention device and further configured with a threaded portion within the injection mold assembly to receive a securing insert.

14. The spring retention device of claim 1, further configured with a spring finger configuration with at least one opening for receiving the spring and a second securing insert.

15. The spring retention assembly device of claim 1, further including a rod to be received by the mold assembly.

16. The spring retention assembly device of claim 1, wherein the spring retention device is a spring finger configuration to be received by the mold assembly.

17. A method for the assembly of the spring retention device, including the steps of having a mold assembly with a recessed back portion, inserting a compression member into the mold assembly, and a compression member.

18. A method for the assembly of a spring retention device of claim 17, further comprising the step of receiving at least two securing inserts, and the spring retention device receives at least two compression members through at least two recessed in a spring finger configuration.

19. A method for the assembly of a spring retention device of claim 17, wherein the method further includes a spring-loaded ejector plate within a mold assembly requiring placement of a compression member in a biased position relative to the ejector plate as a last step in mold assembly.

20. The method as in claim 17, wherein the method includes the placement of a spring retention cup device within the mold assembly for securing a compression member within an interior of the spring retention cup.

21. The method as in claim 17, wherein the spring retention cup device includes ashoulder and a cap portion.

22. A spring retention assembly system, comprising a mold assembly having a back plate with at least one hollow portion, a spring retention device configured to be received by the mold assembly, a compression member configured to fit at least one of in or on the spring retention device, and a securing insert configured to fit within the spring retention device and the compression member.

23. The spring retention assembly system of claim 22, further comprising a cap for securing the spring retention device into the mold assembly, wherein the cap has at least a portion threaded.