The present invention relates, generally, to seal assemblies and, more specifically, to a method of manufacturing a seal assembly with a locator.
Conventional seal assemblies are used in a number of different industries to provide a seal between different components which may be movable relative to one another. By way of non-limiting example, seal assemblies such as weatherstrips, weatherseals, glassrun moldings, window seals, and the like are used in the automotive industry to seal between a vehicle door defining a window opening, and a glass panel supported for sliding movement relative to the door to selectively close the window opening. These conventional seal assemblies may be operatively attached to different portions of the vehicle in a number of different ways, such as with fasteners, clips, and the like.
Those having ordinary skill in the art will appreciate that seal assemblies may be manufactured in a number of different ways to suit specific vehicle application requirements. To this end, conventional seal assemblies are formed from one or more extruded members which are molded together, such as with a plastic injection process, which bonds the extruded members together at a predetermined location corresponding to a portion of the vehicle, such as at a corner of the window opening, to form a molded seal assembly. In order to facilitate attachment to the vehicle, various clips and/or locators are often subsequently attached to the molded seal assembly at predetermined locations which correspond to fastening locations of the particular vehicle. To this end, holes or other formations may be defined in one or more of the extruded members prior to molding, and clips, fasteners, locators, and the like may be subsequently installed into the holes/formations after the molded seal assembly has been formed. It will be appreciated that this approach necessitates that the pre-formed holes/formations be aligned properly prior to molding the seal assembly extrusions together, which may be cumbersome and/or labor intensive and may result in ineffective alignment of the molded seal assembly within the window opening of the vehicle. Moreover, tolerance stack-up inherent in the manufacturing of extruded components, as well as changes in the length of the extruded components after exposure to head during the formation the molding, may further exacerbate misalignment of the completed molded seal assembly.
Another approach conventionally used in the related art is to form the holes/formations after the molded seal assembly has been formed, and subsequently install the clips, fasteners, locators, and the like. However, it will be appreciated that this approach may be labor intensive, may necessitate expensive tooling. Here, tolerance stack-up and labor intensive assembly generally lead to high scrap rates, in particular where vehicle application requirements dictate tight tolerances in the finished molded seal assembly.
While methods of manufacturing seal assemblies known in the related art have generally performed well for their intended purpose, there remains a need in the art for a method of manufacturing seal assemblies which can achieve required manufacturing tolerances, and which can be manufactured in a consisted, cost-effective manner while, at the same time, promoting improved sealing performance in a number of different applications.
The present invention overcomes the disadvantages in the prior art in a method of manufacturing a seal assembly for attachment to a vehicle having a mounting point and defining a vehicle reference point spaced from the mounting point at a predetermined distance. The method utilizes a molding apparatus having a first receptacle and a second receptacle and defining a mold cavity, and a locator receptacle mounted to the molding apparatus outside of the mold cavity. The method includes the steps of: extruding a first strip of material to form a first body extending between opposing first strip ends; extruding a second strip of material to form a second body extending between opposing second strip ends; providing a locator; positioning the locator into the locator receptacle; positioning one of the first strip ends into the first receptacle with a portion of the first body engaging a portion of the locator; positioning one of the second strip ends into the second receptacle;
directing material into the mold cavity to form a joint mold bonding the first strip together with the second strip with the joint mold defining a mold reference point; and bonding the locator outside of the mold cavity to the first body at a location along the first strip spaced from the mold reference point such that a distance between the bonded locator and the mold reference point is equal to the predetermined distance between the mounting point and the vehicle reference point.
In this way, the method of the present invention affords significant advantages for manufacturing seal assemblies in a cost-effective manner while, at the same time, ensuring proper fitment on vehicles in a number of different applications without necessitating the use of complex, labor-intensive, or otherwise unreliable manufacturing processes.
Advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings.
Referring now to the drawings, wherein like numerals indicate corresponding parts throughout the several views, a portion of an automotive passenger vehicle is shown at 20 in
With continued reference to
Referring now to
The first strip 46 and, generally, also the second strip 48 and/or the third strip 50, seals against the window closure member 32 in the closed position (not shown in detail, but generally known in the art). However, those having ordinary skill in the art will appreciate that the seal assembly 30 could have any suitable profile, shape, or configuration sufficient to effect receiving the window closure member 32 in the closed position without departing from the scope of the present invention. By way of non-limiting example, the seal assembly 30 could omit the third strip 50 for certain applications, and each of the strips 46, 48, 50 and the joint mold 52 could be implemented with respectively different shapes, profiles, arrangements, and the like.
The seal assembly 30 further includes a locator 54 (shown in phantom in
In the representative embodiment illustrated herein, and as is best depicted in
Referring now to
It will be appreciated that the first body 60 and/or the lips 66 of the first strip 46 could be manufactured from any suitable material or combination of materials, and could be formed in any suitable way, without departing from the scope of the present invention. By way of non-limiting example, the first strip 46 could be manufactured via a plastic extrusion process utilizing one or more predetermined materials, such as from one or more types of EPDM (Ethylene Propylene Diene Monomer) rubber and/or TPV (ThermoPlastic Vulcanized) rubber. Here too, the second strip 48 and/or the third strip 40 are advantageously manufactured via a plastic extrusion process. In the representative embodiment illustrated herein, and as is best depicted in
As noted above, ensuring proper orientation of the various components of the seal assembly 30 during manufacturing ensures proper alignment of the seal assembly 30 within the window frame 26 of the vehicle 20. Specifically, in the representative embodiment illustrated herein, the predetermined distance 38 between the mounting point 34 and the vehicle reference point 36 of the vehicle 20 (see
In certain embodiments, one or more of the first strip ends 62 of the first strip 46 of seal assembly 30 may be “notched” to receive or otherwise align with one or more of the second and/or third strips 48, 50 prior to formation of the joint mold 52, as described in greater detail below. To that end, in one embodiment, as shown best in
In the representative embodiment depicted herein, the locator 54 is pre-formed via a molding process (by way of non-limiting example, via injection molding, transfer molding, blow molding, and the like) from a thermoplastic such as Polypropylene (PP) or High-Density PolyEthylene (HD-PE), prior to heat bonding of the locator 54 to the first strip 46. However, those having ordinary skill in the art will appreciate that the locator 54 could be formed from any suitable material sufficient to bond to the first strip 46 and to facilitate proper alignment of the seal assembly 30, as described above, without departing from the scope of the present invention.
Referring now to
Referring now to the embodiment of the molding system 78 depicted in
As noted above, the molding system 78 can be implemented in a number of different ways. To that end, another embodiment of a molding system 178 is illustrated in
As noted above, the present invention is directed towards a method of manufacturing the seal assembly 30 described above by utilizing molding systems 78, 178 of the types described herein and depicted throughout the drawings. Moreover, it will be appreciated that the molding systems 78, 178 illustrated in
The method includes the step of extruding the first strip 46 of material to form the first body 60 extending between the opposed first strip ends 62, and the step of extruding the second strip 48 of material to form the second body 68 extending between the opposed second strip ends 70. The method further includes the steps of providing the locator 54 and positioning the locator 54 into the locator receptacle 106, 206. The method further includes the step of positioning one of the first strip ends 62 into the first receptacle 98, 198 with a portion of the first body 60 engaging a portion of the locator 54, and the step of positioning one of the second strip ends 70 into the second receptacle 100, 200. The method further includes the step of directing material into the mold cavity 104, 204 to form the joint mold 52 bonding the first strip 46 together with the second strip 48 with the joint mold 52 defining the mold reference point 42. The method further includes the step of bonding the locator 54 outside of the mold cavity 104, 204 at the location 40 along the first strip 46 spaced from the mold reference point 42 such that the distance 44 between the bonded locator 54 and the mold reference point 42 is equal to the predetermined distance 38 between the mounting point 34 and the vehicle reference point 36 of the vehicle 20.
In one embodiment, the step of positioning the locator 54 into the locator receptacle 106, 206 occurs prior to the step of directing material into the mold cavity 104, 204.
In one embodiment, the method further includes the step of forming the locator 54 with the locator 54 having the tab 56 and the foot 58. Here, the step of forming the locator 54 may occur prior to the step of extruding the first strip 46 of material. Here too in this embodiment, the step of positioning the locator 54 into the locator receptacle 106, 206 further includes the step of positioning at least a portion of the tab 56 of the locator 54 into the locator receptacle 106, 206. Further, in this embodiment, the step of positioning one of the first strip ends 62 into the first receptacle 98, 198 may further include the step of abutting the portion the first body 60 of the first strip 46 against the foot 58 of the locator 54.
It will be appreciated that the step of bonding the locator 54 outside of the mold cavity 104 can be achieved in different ways, depending on application requirements and the specific configuration of the molding system 78, 178. By way of non-limiting example, this step could be achieved using heat conducted between the molding apparatus 94, 194 and the locator apparatus 96, 196, such as may be generated during the step of directing material into the mold cavity 104, 204 which, in turn, may be further defined as injecting molten material, such as EDPM rubber, into the mold cavity 104, 204 with the injector 86 (see
In one embodiment, the step of bonding the locator 54 outside of the mold cavity 104, 204 to the first body 60 further includes the step of heating the locator receptacle 106, 206 with the heating element 88 (see
In one embodiment, the method further includes the step of cooling the locator receptacle 106, 206 with the water jacket 90 arranged in fluid communication with the source of fluid 92 (see
In one embodiment, the method further includes the step of releasing the bonded locator 54 from the locator receptacle 106, 206. In this embodiment, the step of releasing the bonded locator 54 may occur after the steps of directing material into the mold cavity 104, 204 and bonding the locator 54 outside of the mold cavity 104, 204 to the first body 60. Similarly, in one embodiment, the method may further include the steps of removing the joint mold 52 from the mold cavity 104, 204 and removing the bonded locator 54 from the locator receptacle 106, 206. In this embodiment, the step of removing the joint mold 52 may further include the step of removing the first and second strips 46, 48 in unison with the removal of the joint mold 52 and the step of removing the bonded locator 54 in unison with the removal of the first strip 46. Similarly, in one embodiment, the method further includes the step of removing the joint mold 52, the first strip 46, and the second strip 48 from the molding apparatus 94, 194, and removing the bonded locator 54 from the locator receptacle 106, 206.
In this way, the method of the present invention affords significant improvements with respect to maintaining the distance 44 between the location 40 and the mold reference point 42 so as to correspondingly achieve the requisite predetermined distance 38 between the mounting point 34 and the vehicle reference point 36 of the vehicle 20 while, at the same time, mitigating tolerance stack-up which could otherwise occur during manufacturing from geometric variations in the various components of the seal assembly 30.
While the invention has been described with reference to the examples above, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all examples falling within the scope of the appended claims.
The subject patent application claims priority to and all the benefits of U.S. Provisional Patent Application Ser. No. 62/246,382 which was filed on Oct. 26, 2015, the disclosure of which is hereby incorporated by reference.
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/US2016/058820 | 10/26/2016 | WO | 00 |
Number | Date | Country | |
---|---|---|---|
62246382 | Oct 2015 | US |