Source: http://www.google.com/patents/US5673472?dq=7,468,661
Timestamp: 2017-02-21 19:57:56
Document Index: 520480871

Matched Legal Cases: ['art 18', 'art 18', 'art 18', 'arts 300', 'art 18', 'art 18', 'art 204']

Patent US5673472 - Method of coupling a fastener on a metal sheet and forming a molded part - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThe present invention is a method of making a molded part having a sheet metal portion and at lease one fastener coupled to the sheet metal portion. The fastener has a body portion and an annular barrel portion which extends from the body portion. The body portion has a free open end and a bore extending...http://www.google.com/patents/US5673472?utm_source=gb-gplus-sharePatent US5673472 - Method of coupling a fastener on a metal sheet and forming a molded partAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5673472 APublication typeGrantApplication numberUS 08/448,887Publication dateOct 7, 1997Filing dateMay 24, 1995Priority dateFeb 2, 1980Fee statusLapsedAlso published asUS5617652Publication number08448887, 448887, US 5673472 A, US 5673472A, US-A-5673472, US5673472 A, US5673472AInventorsRudolph R. M. MullerOriginal AssigneeMultifastener CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (45), Referenced by (26), Classifications (26), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetMethod of coupling a fastener on a metal sheet and forming a molded part
US 5673472 AAbstract
The present invention is a method of making a molded part having a sheet metal portion and at lease one fastener coupled to the sheet metal portion. The fastener has a body portion and an annular barrel portion which extends from the body portion. The body portion has a free open end and a bore extending therethrough in generally coaxial alignment with the opening in the barrel portion. The barrel portion free end is driven into the sheet metal to pierce the sheet metal and form a slug from the sheet metal. The barrel is also deformed radially outwardly in mechanical interlocking relation with the panel. The slug which is formed is wedged into the opening of the barrel portion to seal the barrel portion. The sheet metal and barrel portion can then be surrounded with molding material with the slug preventing the molding material from flowing into the bore.
1. A method of making a molded part having a sheet metal portion and at least one fastener coupled to the sheet metal portion comprising the steps of:a) providing a fastener having a body portion and an annular barrel portion extending from the body portion, the barrel portion having an opening and the body portion having a free open end and a bore extending therethrough in generally coaxial alignment with the opening in the barrel portion: b) locating the fastener adjacent the sheet metal with the barrel portion free end facing said sheet metal; c) biasing the fastener barrel portion free end against the sheet metal; d) driving the barrel portion free end into the sheet metal, piercing the sheet metal and forming a slug from the sheet metal; e) deforming the barrel portion free end radially outwardly, in mechanical interlocking relation with said panel; f) wedging the slug into the opening of the barrel portion; g) surrounding the sheet metal and the opening of the barrel portion with molding material with the slug preventing said molding material from flowing into said bore. 2. The method of claim 1, including the step of internally threading said bore.
3. The method of claim 1, wherein said opening in said barrel portion has an inner diameter that is greater than the inner diameter of said bore forming an offset between said opening in said barrel and said bore, said method including the step of forming an inwardly extending lip within said barrel portion, said slug being retained between said lip and said offset.
4. The method of claim 3, wherein said slug is removably secured within said barrel.
5. The method of claim 1, wherein said fastener includes a shoulder extending radially outwardly from the outer surface of said fastener, generally between said body portion and said barrel portion, said shoulder including ribs, said method including the step of deforming said sheet metal adjacent said ribs defining raised features, said raised features operating with said ribs to resist rotation of said fastener.
6. The molded part of claim 1, including the step of deforming said sheet metal to form a recess; anddeforming said barrel portion in said recess. Description
This application is a divisional application of U.S. patent application Ser. No. 08/157,991, now abandoned, filed Nov. 24, 1993, which is a is a continuation-in-part application of application Ser. No. 92,595, filed Jul. 15, 1993, now abandoned, which is a divisional application of Ser. No. 888,580, filed May 26, 1992, now U.S. Pat. No. 5,237,733, which was a continuation-in-part of Ser. No. 806,172, filed Dec. 12, 1991, now U.S. Pat. No. 5,146,672, which application was a division of Ser. No. 457,060, filed Dec. 26, 1989, now U.S. Pat. No. 5,072,518, which was a division of Ser. No. 271,123, filed Nov. 14, 1988, now U.S. Pat. No. 4,893,394, which was a division of 111,966, filed Oct. 21, 1987, now U.S. Pat. No. 4,831,698, which was a continuation-in-part of Ser. No. 069,804, filed Aug. 17, 1987, now U.S. Pat. No. 4,810,143, which was a division of Ser. No. 869,507, filed Jun. 2, 1986, now U.S. Pat. No. 4,700,470, which was a division of Ser. No. 657,570, filed Oct. 4, 1984, now U.S. Pat. No. 4,610,072, which was a continuation-in-part of Ser. No. 563,833, filed Dec. 21, 1983, now U.S. Pat. No. 4,555,838, which was a continuation-in-part of Ser. No. 504,074, filed Jun. 14, 1983, now U.S. Pat. No. 4,543,701 and a continuation-in-part of Ser. No. 485,099, filed Mar. 28, 1983, now U.S. Pat. No. 4,459,073. Ser. No. 504,074 was a continuation of Ser. No. 229,274, filed Jan. 28, 1981, now abandoned and Ser. No. 485,099 was a divisional application of Ser. No. 229,274 filed Jan. 28, 1981, now abandoned. Ser. No. 229,274 claims priority to an application filed in the Federal Republic of Germany, No. 3,003,908, filed Feb. 2, 1980.
The present invention relates to a sheet metal part having at least one nut element introduced by a riveting process. Such sheet metal parts are well-known in practice and are for example shown in German patent specification 34 47 006, 34 46 978 and in DE-OS 30 16 675.
It would be possible to satisfy this object in that the nut element is closed off in the injection molding die on both sides, for example, through confronting wail parts of the injection molding die or through special inserts which lie flush against the two end faces of the inserted nut element. This would, however, lead to restrictions in the layout of the injection molding die and to considerable extra complexity and cost so that it can also be seen as a general part of the object underlying the invention to provide greater freedom in the layout of injection molded parts with embedded sheet metal nut elements and also to reduce the complexity and cost in realizing the injection molding and the injection molded part.
In order to satisfy these objects, provision is made in accordance with the invention, and with a sheet metal part of the initially named kind, that the passage opening of the nut element is closed off by a stamped slug.
FIG. 1 a partial cross-section through a stamping head in the initial stage of a method of introducing a nut element into a sheet metal part by piercing and riveting;
FIG. 1 shows a section through a stamping head 10, which, in general, is formed in accordance with the stamping head of the German patent specification 34 46 978 and, above all, in accordance with the German patent specification 34 47 006 and which can be built into a stamping and/or embossing press with oppositely disposed plates which are movable relative to one another. FIG. 1 discloses the stamping head built into the upper press plate, it could however be built into the lower press plate or into an intermediate plate in just the same way.
The ting recess 42 of the die button 20 is continued in the embodiment of FIGS. 1 to 4 beyond the actual end face 48 of the insert and merges via a rounded ring shoulder 50 into a shallow ring-like region 52. The contour of the die button then merges via a further rounded ring shoulder 54 into a wall 56 which borders conically downwardly (in FIGS. 1 to 5) and rounds out at approximately the level of the line 40 via a further ring shoulder 58 into a surface 60 parallel to the sheet metal 18. This surface 60 then merges into the actual press surface of the tool which is used for the forming of the lower side of the sheet metal part 18.
The stamping head 10 is provided with a circular recess 66 in a shape which is complementary to the shape of the outer boundary of the annular raised portion 64 of the due button, but which is, however, greater in diameter by about twice the thickness of the sheet metal pan 18, so that on closing of the press space is provided for the sheet metal between the ring recess 66 and the annular raised portion 64. In other words the recess 66 has a cortically extending wall pan 68 which diverges downwardly and which merges via a ring shoulder 60 into a ring surface 72 parallel to the plane of the sheet metal 18. The ring surface 72 can then merge in correspondence with the ring surface 60 into the actual press surface of the tool, at least when the press is closed.
It is furthermore evident from FIG. 1 that the rounded impact and drawing edge 32 of the pierce and rivet section of the nut element has an oblique chamfer 82 at the radially inner side, for example at an angle to the centerline 13 of approximately 45°, and merges at the radially outer side via a gentle curve 84 into a cylindrical outer wall section 86 parallel to the cylindrical inner wall of the pierce and rivet section.
The cylindrical wall section 86 merges at approximately half height into a conically upwardly diverging section 88 which subsequently merges via a rounded portion into the ring shoulder 26. One notes also that the cylindrical inner wall 90 of the nut element has a larger diameter than the thread 24. Finally, one sees from FIG. 1 a punch insert or punch 92 which is fixedly arranged in the ram 12 and extends with radial clearance through the thread 24. As an alternative to this, a displacement movement of the punch insert 92 could be permitted, for example to facilitate the introduction of the individual nut elements 14, or for technical reasons during the later occurring movement of the ram unit 12 in the direction of the matrix insert. In this example the lower end of the punch insert 92 is of hexagonal shape and merges via a slight ring chamfer 94 into a central surface 96 parallel of the sheet metal pan 18. Between the chamfer 94 and the outer wall of the punch insert 92 there is an annular rounded Portion 98.
FIG. 2 shows precisely the position of the tool in which the stamped slug 100 is formed. One notes that the stamped slug which is to be attributed on middle, which is to be attributed on the one hand to the shaping of the end face of the insert 30 and on the other end to the shearing action between the stamp and rivet section of the nut element and the insert 30. Stated more precisely, this arching of the stamped slug 100 results from the action of the cutting surface 82 of the pierce and rivet section and the cutting edge 33 of the insert 30, as already explained above.
Instead of terminating the method of manufacture with the opening of the press after the manufacturing step of FIG. 4, it can be advantageous to carry out a further manufacturing step as is shown in FIG. 5. The manufacturing step of FIG. 5 takes place with different tools than are shown for FIGS. 1 to 4. This manufacturing step of FIG. 5 can take place in a quite different press installation and can however also be carried out as a further step in a further station of the same press installation as was used for carrying out the method steps of FIGS. 1 to 4; i.e., the press installation is laid out to use sequential step tooling.
FIG. 5 shows several possible method variants in one drawing. FIG. 5 in particular shows a possibility of more reliably framing the stamped slug within the nut element. Furthermore, FIG. 5 shows the possibility of pressing the rivet flange 112 flat. This is on the one hand interesting when, for example, the end face of the turned-over rivet flange 112 should lie within the recess 120 of the sheet metal part 18, or when, in a separate process the stamped slug 100 is not to be inserted at the position shown in FIG. 5, but rather in a ring space at the other end of the nut. In the latter case, the bolt which cooperates with the nut element should be introduced from the side of the turned-over rivet flange 112 and would customarily press a different sheet metal component against the turned-over rivet flange 112. In this case, the planar design of the rivet flange 112 leads to an enlargement of the surface transferring the clamping forces whereby an excessive surface pressure between the rivet flange 112 and the sheet metal pan to be screwed on can be avoided, so that plastic deformation of the sheet metal pan or of the rivet flange 112, or the settling effects of these pans as a result of excessive surface pressure need no longer be feared.
In the embodiment of FIG. 5, the die button 20 has a substantially planar surface 60 without a pronounced annular raised portion 64. In place of this the surface of the die button 20 which faces the sheet metal simply has a ring-shaped surface 130 which merges via a small step 132 into the planar surface 60. The ring surface 130 is parallel to the surface 60; i.e., to the plane of the inserted piece of sheet metal 18 of the earlier station (where the method steps were carded out in accordance with FIGS. 1 to 4). The insert 30 has a substantially cylindrical shape and merely has a rounded undercut 134 at the end face with the rounded undercut terminating in a planar surface 74 arranged perpendicular to the center line 13.
The ram unit 12 in this embodiment has no centrally arranged punch 92 as in the ram unit of the earlier station. The stamped slug 100 which is cut out from the sheet metal pan 18, and which is arranged in FIG. 4 beneath the thread 24, is pushed upwardly under the action of the now present insert 30 until it abuts at the upper side against a ring shoulder 136 which is located directly beneath the thread 24 of the nut element 14.
FIG. 6 shows an example of the use of the present invention for the sole 200 of a sporting shoe or of a golf shoe. The sole 200 consists of a plastic composition 201, or of rubber and has in its interior, as is evident from FIG. 7, a sheet metal part 18 which is provided with nut elements 14 (of which only one element can be seen in FIG. 7) which were inserted in accordance with the previously described method of FIGS. 1 to 4. These nut elements 14 form threaded mounts for spikes or studs 202 which are screwed into the respective nut elements. In distinction to the previously described methods, no pronounced recessing of the sheet metal is provided in this example in the region of the individual nut elements. This requires a somewhat modified shape of the upper side of the and also of the lower side of the stamping head.
FIG. 8 shows only one part of an injection molding die in cross-section having upper and lower die parts 300 and 302 which fit together at a partition joint 304 and form respective hollow die cavities 306 and 308. The sheet metal part 18 with the inserted nut elements 14, of which only some are shown, sit in the hollow cavity of the injection molding die and are supported on pins, such as for example 310, which in this example are arranged beneath the respective stamped slugs 100. In this example, that it cover rim 112 of the rivet satisfies a double-function in that it cooperates with the pins 310 and brings about a centering of the sheet metal part 18 in the injection molding die. If necessary, other centering devices can however also be provided. Above the nut part of the nut element 14 there is located a further die insert in the form of a pin 312 with a cylindrical head 314 which is arranged above the nut part and contacts the end face 310 of the nut part. The head 314 has a diameter which is admittedly greater than the core diameter of the thread, but is however smaller than the outer diameter of the nut pan. As the stamped slug 100 is somewhat resilient, this design enables complete closing of the two halves of the injection molding die, even if the tolerances of the pins 310 and 312 should be somewhat unfavorable. After the closing of the injection molding die, the injection molding composition is injected into the die. It flows into all hollow cavities of the injection molding die; i.e., into the regions shown there by cross-hatching in FIG. 8. One notes that the injection molding composition surrounds a part of the other end surface of the nut part of the nut element 14. This has the advantage in a shoe sole that, on the one hand, penetration of moisture around of the nut part is made more difficult and, on the other hand, as shown in FIG. 7, a stud or spike can be so screwed in that a collar part 204 compresses the injection molding composition present between the stud and the nut element. This not only brings about better sealing, but rather also a security against rotation of the respective stud or spikes so that these cannot be lost.
As explained, the thread entry is closed off by corresponding sealing measures in the plastic or rubber molding tool, such as-through the pins 312 in the example of FIG. 8.
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KgFunctional element, component assembly comprising a sheet metal part and a functional element as well as methods for the attachment of a functional element to a sheet metal partUS20090196678 *Jun 1, 2007Aug 6, 2009Profil Verbindungstechnik Gmbh & Co. KgRivet nut and rivet bolt and combination of a rivet nut or a rivet bolt with a sheet metal partUS20100209210 *Apr 26, 2010Aug 19, 2010Zdravko KovacSelf-attaching nutUS20110039123 *Aug 13, 2010Feb 17, 2011Wojtaszek Henry JClinching during molding processEP1112830A1 *Dec 22, 2000Jul 4, 2001Valeo Thermique MoteurMethod for assembling two sheet metalsWO2004100641A3 *May 7, 2004Jun 30, 2005Bill WhitakerPiercing anchor plate assembly* Cited by examinerClassifications U.S. Classification29/432.1, 264/244, 36/59.00R, 29/512International ClassificationA43B13/26, A43D100/14, A43D100/00, F16B37/06, A43B5/00, A43C15/16, B23P19/06Cooperative ClassificationY10T29/4992, Y10T29/49835, F16B37/068, B23P19/062, F16B37/065European ClassificationA43B1/00M, F16B37/06B4, B23P19/06B, A43B5/00B, A43D100/00, A43B13/26, A43C15/16C, A43D100/14, A43C15/16A, F16B37/06B2Legal EventsDateCodeEventDescriptionDec 11, 1998ASAssignmentOwner name: FABRI-STEEL PRODUCTS INCORPORATED, MICHIGANFree format text: SECURITY INTEREST;ASSIGNOR:MULTIFASTENER CORPORATION;REEL/FRAME:009648/0434Effective date: 19980324Feb 15, 2001FPAYFee paymentYear of fee payment: 4Sep 15, 2004ASAssignmentOwner name: SOUTHTRUST, ALABAMAFree format text: SECURITY AGREEMENT;ASSIGNOR:WHITESELL INTERNATIONAL CORPORATION;REEL/FRAME:015127/0234Effective date: 20040910Apr 27, 2005REMIMaintenance fee reminder mailedOct 7, 2005LAPSLapse for failure to pay maintenance feesDec 6, 2005FPExpired due to failure to pay maintenance feeEffective date: 20051007Apr 30, 2010ASAssignmentOwner name: WHITESELL INTERNATIONAL CORPORATION,MICHIGANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MULTIFASTENER CORPORATION;REEL/FRAME:024312/0924Effective date: 20050617RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services