WO1990004269A1 - Contacts electriques perfectionnes - Google Patents

Contacts electriques perfectionnes Download PDF

Info

Publication number
WO1990004269A1
WO1990004269A1 PCT/US1989/004416 US8904416W WO9004269A1 WO 1990004269 A1 WO1990004269 A1 WO 1990004269A1 US 8904416 W US8904416 W US 8904416W WO 9004269 A1 WO9004269 A1 WO 9004269A1
Authority
WO
WIPO (PCT)
Prior art keywords
aperture
axis
alignment surfaces
tail
contact
Prior art date
Application number
PCT/US1989/004416
Other languages
English (en)
Inventor
John J. Rozmus
Original Assignee
Rozmus John J
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rozmus John J filed Critical Rozmus John J
Publication of WO1990004269A1 publication Critical patent/WO1990004269A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/306—Lead-in-hole components, e.g. affixing or retention before soldering, spacing means
    • H05K3/308—Adaptations of leads

Definitions

  • This invention relates to electrical contacts, particularly wire wrap pin contacts of the type having a connector tail, a wire wrap tail, and an intermediate retention section.
  • contacts As a means to make electrical connections in equipment employing integrated circuits and printed circuit boards, for example, to make connections in communication and computer equipment.
  • contacts are mounted in plated holes in a printed circuit board to establish, via the plated holes, electrical connections to conductive paths on the board.
  • the contacts are mounted in non-plated holes and serve as conductors between electrical elements on opposite sides of the board.
  • Such contacts are mass produced by being stamped out in a progressive die.
  • the contacts are set up for use in equipment of the kind mentioned by machine-mounting a large number of contacts in an insertion carrier or fixture, the connector tail of each contact being inserted in a socket in the carrier with the retention section and wire wrap tail extending outwardly from one face of the carrier.
  • the carrier is positioned over the surface of a printed circuit board with respective wire wrap tails aligned with holes in the board.
  • the carrier and board are relatively moved toward one another so that in each contact the wire wrap tail and retention section move into the aperture until the wire wrap tail extends outwardly from the opposite face of the board and the retention section engages with the side of the aperture.
  • the wire wrap tails of the contacts are subsequently wrapped with wire.
  • the above mentioned carrier or fixture may be permanently mounted on the board with the connector tails of the contacts making internal electrical connections or the carrier or fixture may, after contact insertion, be removed leaving the connector tails free for subsequent connection to electrical elements.
  • a wire wrap operation is characterized in that it proceeds at very high speed and the position of the means which does the actual wrapping of the wire wrap tail is determined by a computer program which positions the wrapping means as a function of the location of the axis of each aperture and not by sensing the actual location of the wire wrap tail and accordingly adjusting position. It is essential, therefore, that the axis of the wire wrap tail of each contact not be bent; i.e., that it be co-axial with the axis of the aperture.
  • the wire wrap operation will produce defective boards by failing to wrap the bent tail or improperly wrapping same or the operation will automatically terminate until the wire wrap tail is repositioned to be co-axial. Assuming that a contact is produced with a straight axis, the affect of the behavior of the retention section during the insertion of the contact in a board aperture is the source of the bent or non-coaxial condition.
  • Retention sections in contacts of the kind in question are of two types.
  • One type contemplates a solid configuration which has a minimal, if any, yield upon insertion.
  • the other type contemplates a configuration deliberately designed to substantially yield during insertion.
  • the solid type retention section behaves during the insertion operation in a way which eliminates bending of the wire wrap tail or, if it bends at all, the amount is insignificant and creates no problem in the wire wrap operation. From that standpoint, contacts with such retention sections are desirable. However, such contacts have several disadvantages.
  • these retention sections take the form of two or more flexible or resilient arms, two or more flexible or resilient fins, or a single, folded-over section shaped to engage the aperture wall at several circumferential points.
  • the prime disadvantage of the resilient or yielding retention section is that it is virtually impossible to stamp out a retention section having a symmetry of cross-section and distribution of material and shape so that corresponding parts will uniformly yield as the contact is inserted into the aperture.
  • the arms will have different yield characteristics as the insertion takes place, and this difference causes the wire wrap tails to bend so that the axis of the wire wrap tail and the axis of the aperture are not co-axial. This creates a problem in the wire wrap operation since the machine is programmed to wrap a tail which is co-axial with the axis of the aperture of the board.
  • the principal objective of the invention is to provide a pin type contact having a resilient retention section together with alignment means which functions to insure that neither the wire wrap tail nor the connector tail will bend, thus providing for an inserted contact whose axis is co-axial with the axis of the aperture.
  • the contact is provided with two alignment means, one which avoids bending of the wire wrap tail and the other avoids bending of the connector tail.
  • the invention contemplates a contact having a central retention section of the resilient type and, adjacent one or both ends of the retention section, an alignment section which preferably takes the form of oppositely disposed segments of a cylinder whose diameter is substantially the same as the diameter of the aperture in which the contact is to be inserted and whose center lies in the axis of the contact.
  • the invention contemplates that such contacts be formed either from square wire stock preferably using a progressive die for high speed production or from strip stock also utilizing a progressive die.
  • the invention contemplates the coining of the wire in a special way to achieve the contact shape desired.
  • the contact of the invention made from square wire not only has the non-bending feature mentioned heretofore, but has the additionally important feature of having a manufacturing cost which is about one half that of forming the contact from strip stock.
  • the wire wrap tail enters and passes through the aperture followed by an alignment section.
  • the alignment section As the alignment section is passing through the aperture, it is immediately followed by the resilient retention section which engages the aperture wall and yields. Even when the yielding is not uniform so that the forces seek to bend the wire wrap tail, the latter forces are overcome by the alignment section and the axis of the wire wrap tail remains co-axial with the aperture axis.
  • the other alignment section engages the aperture wall. The other alignment section is effective to maintain the axis of the connector tail co-axial with the aperture axis in those instances where the fixture or carrier is removed.
  • Figure 1 is an elevational view of a contact of the invention formed from strip in a progressive die
  • Figure 2 is a side view looking along the lines 2-2 of Figure 1;
  • Figures 3-6 are cross sectional views taken respectively along the lines 3-3, 4-4, 5-5, and 6-6 in Figure 1;
  • Figure 7 is an elevational view of a contact of the invention formed from square wire stock in a progressive die.
  • Figure 8 is a side view looking along the lines 8-8 of Figure 7.
  • Such contacts are made from resilient copper alloy such as phosphorus bronze.
  • the contacts are formed in a progressive die by employing conventional techniques. No details of the construction and operation of a progressive die are given herein. Typical progressive dies stamping out contacts from strip stock are shown in my patents 3,990,864 and 4,641,910.
  • square is inclusive of wire with a rectangular cross section.
  • the contact includes a connector tail 1, a wire wrap tail 2, a retention section 3, alignment sections 4 and 5, and tapered transition sections 6 and 7, all of which are disposed along the axis A-l of the contact.
  • the contact terminates in the truncated ends 8 and 9.
  • the connector tail 1, and the wire wrap tail 2 are each cut from the strip to have a 0.025" thickness, and, thus have a square configuration as will be observed from an inspection of Fig. 3.
  • the retention section 3 includes a pair of outwardly bowed arms 10 and 11 separated by an open center 12.
  • the arms extend axially between the points indicated at 13 and 14 and may be fabricated as explained in my patent 4,641,910.
  • the cross sectional shapes of the arms are illustrated in Figures 5 and 6 where the circuit board aperture is indicated by dotted line 15. It will be observed that the outer edges or operating surfaces 10a and 11a have a semi-circular shape. The small bulged out areas of the extreme ends of the surfaces are created by metal flow when the surfaces are formed.
  • the surfaces 10a and 11a engage the wall and the arms flex inwardly toward the axis A and develop retaining forces.
  • the respective shapes of the surfaces 10a and 11a are coordinated with the diameter of the board aperture so that, when the surfaces are engaged with the aperture wall, they will substantially coincide with the circumference of the aperture throughout their respective axial lengths.
  • the lateral dimension across the contact at the center point 16 is 0.043" and the lateral dimension across the contact at the points 13 and 14 is 0.038".
  • the distance between the points 13 and 14 is 0.085".
  • the surfaces 10a and 11a are tapered as above noted, these surfaces are formed so that at each point along the axis A from the center 15 to the ends 13 and 14 the radii are equal. This is accomplished by arranging the hugging operation tooling, as noted in my patent 4,641,514, so that the radii of the surfaces 10a and 11a at the various axial positions are located respectively along the dotted lines 17 and 18. At each axial location, the radial distance between the dotted line 17 and the semi-circular surface 10a is one half the diamenter of the board aperture. The same condition pertains between the dotted line 18 and the surface 11a. For the dimensions given, the dotted lines intersect at point 13 and are separated by a distance of 0.005" at point 16.
  • the outside dimension of the retention section 3 starting at the center 16 gradually decreases from 0.043" down to 0.038" at the points 13 and 14 which are starting points of the alignment sections 4 and 5.
  • the cross sectional shape of the alignment section 4 is indicated in Figure 5.
  • the alignment section 5 is identical.
  • the alignment sections 4 and 5 have semi-circular surfaces 4a and 4b and 5a and 5b.
  • the radius of each surface lies in the axis A-l and is 0.019" in length.
  • the alignment section 4 extends axially between the point indicated at 13 and the point indicated at 20 and the alignment section 5 extends axially between the point indicated at 13 and the point indicated at 21. Both are 0.020" in length.
  • the surfaces 4a and 4b each have the form of a segment of a cylinder.
  • the surfaces 5a and 5b each have the form of a segment of a cylinder.
  • the contact includes the connector tail 22, the wire wrap tail 23, the retention section 24, the alignment sections 25 and 26, and tapered transition sections 27 and 28 all of which are disposed along the axis A-2.
  • the contact has truncated ends 30 and 31.
  • the retention section 22 includes the outwardly bowed arms 32 and 33 separated by the open center 34.
  • the contacts as viewed in Figures 1 and 7 have the same exterior shape and have the same dimensions. Also, the contact of Figure 7 has the same outside shape as shown in figures 3 through 6.
  • the contact at the center point indicated at 35 has a thickness dimension of 0.025" which is the same as the thickness of the square wire stock.
  • the thickness dimension then gradually decreases to the points indicated at 36 and 37 and forms tapered sections on opposite side of center. Between points 36 and 40 (alignment section 23) and points 37 and 41 (alignment section 24) , the thickness is a constant value of 0.017" and forms constant thickness sections.
  • the metal is tapered to accommodate change from large to smaller dimensions ( Figure 7) and from small to larger dimensions ( Figure 8) .
  • the points 36 and 37 represent the respective ends of cut-out 34 and the start of the alignment sections 23 and 24.
  • the operation can be carried out so that the individual contacts are discharged from the die while joined to a portion of the strip which serves as a carrier, the latter being for use in delivering the contacts to a plating operation. After the plating operation the individual contacts are severed. For descriptive purposes herein, assume that the contacts are discharged while connected to a carrier.
  • the carrier with the finished contact attached exits from the die to a plating station and, after plating, the plated contacts are severed from the carrier.
  • a 0.025" wire is fed into the progressive die.
  • the punches are employed to coin the wire so it assumes the contour as shown in Figure 8.
  • the next operation involves the forming of the open section 34. This is done by the use of top and bottom splitting-wedge type punches, the effect of which is to form an axial slot. The material on either side of the slot will constitute the material of the arms 32 and 33.
  • sizing punches are used to spread the slot and in effect to bow the arms outwardly.
  • an anvil is inserted in the opening and hugger type tooling employed to form the above described contours on the arms and alignment section.
  • coining punches are employed to form the truncated ends 30 and 31.
  • the lead contact For plating purposes, as the wire exits from the die, the lead contact is inserted into a socket in a transversly moving carrier. When the contact is in position it is served from the next adjacent contact. The carrier then conveys the contact to a plating operation.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)

Abstract

Un contact électrique s'introduisant dans une ouverture d'un module électrique présente un corps allongé avec une paire de surfaces d'alignement présentant chacune la configuration d'un segment d'un cylindre dont le diamètre est sensiblement le même que le diamètre de l'ouverture du module dans lequel s'introduit le contact et dont l'axe est coaxial avec l'axe dudit corps. Les surfaces d'alignement sont espacées circonférentiellement. Elles servent à amener la paroi de ladite ouverture à positionner et maintenir l'axe du contact coaxial avec l'axe de ladite ouverture. Le contact comporte également des moyens de retenue adjacents auxdites surfaces d'alignement pour amener la paroi de l'ouverture à engendrer des forces de retenue.
PCT/US1989/004416 1988-10-06 1989-10-05 Contacts electriques perfectionnes WO1990004269A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25410588A 1988-10-06 1988-10-06
US254,105 1988-10-06

Publications (1)

Publication Number Publication Date
WO1990004269A1 true WO1990004269A1 (fr) 1990-04-19

Family

ID=22962949

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004416 WO1990004269A1 (fr) 1988-10-06 1989-10-05 Contacts electriques perfectionnes

Country Status (1)

Country Link
WO (1) WO1990004269A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245770B (en) * 1990-06-01 1994-09-21 Oxley Dev Co Ltd Compliant pins

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1149332A (en) * 1967-01-27 1969-04-23 Amp Inc Electrical contact pins and method of manufacture
DE3533339A1 (de) * 1985-09-16 1987-03-26 Siemens Ag Verfahren zur herstellung von einpresszonen fuer kontaktteile
DE3623453A1 (de) * 1986-07-11 1988-01-21 Neumayer Karl Kontaktstift
EP0325296A2 (fr) * 1988-01-21 1989-07-26 GTE Products Corporation Connecteur électrique avec section souple

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1149332A (en) * 1967-01-27 1969-04-23 Amp Inc Electrical contact pins and method of manufacture
DE3533339A1 (de) * 1985-09-16 1987-03-26 Siemens Ag Verfahren zur herstellung von einpresszonen fuer kontaktteile
DE3623453A1 (de) * 1986-07-11 1988-01-21 Neumayer Karl Kontaktstift
EP0325296A2 (fr) * 1988-01-21 1989-07-26 GTE Products Corporation Connecteur électrique avec section souple

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON COMPONENTS,HYBRIDS,AND MANUFACTURING vol. CHMT8, no. 1, March 1985, NEW YORK US pages 40 - 45; TSUNEO KANAI et al.: "Design of a Compilant Press-Fit Pin Connection" see the whole document *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245770B (en) * 1990-06-01 1994-09-21 Oxley Dev Co Ltd Compliant pins

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