US3783433A - Solderless electrical connection system - Google Patents

Solderless electrical connection system Download PDF

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Publication number
US3783433A
US3783433A US00107240A US3783433DA US3783433A US 3783433 A US3783433 A US 3783433A US 00107240 A US00107240 A US 00107240A US 3783433D A US3783433D A US 3783433DA US 3783433 A US3783433 A US 3783433A
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United States
Prior art keywords
apertures
electrical
contact
conductive
section
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Expired - Lifetime
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US00107240A
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English (en)
Inventor
H Kurtz
C Gourley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northrop Grumman Guidance and Electronics Co Inc
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Litton Systems Inc
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    • 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
    • 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
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/02—Arrangements of circuit components or wiring on supporting structure
    • H05K7/10—Plug-in assemblages of components, e.g. IC sockets
    • H05K7/1015—Plug-in assemblages of components, e.g. IC sockets having exterior leads
    • H05K7/103—Plug-in assemblages of components, e.g. IC sockets having exterior leads co-operating by sliding, e.g. DIP carriers
    • H05K7/1038—Plug-in assemblages of components, e.g. IC sockets having exterior leads co-operating by sliding, e.g. DIP carriers with spring contact pieces

Definitions

  • a solderless electrical connection system is shown having a main mounting boardwith 5551151113, of plat- [52] us Cl 339/17 C, 339/176 MP 339/2 S ed-through holes therein.
  • Each end of the conductive UNITED STATES PATENTS contact may be provided with a configuration which 3 93 3; 37 allows electrical components to bemounted thereby c a en 3,065,440 11/1962 Bonwilt et al. 339/19 x or attached thereto 3,448,345 6/1969 Kochler, .11. et al. 339/17 CF X 6 Claims, 14 Drawing Figures PATKNTEB JAN 1 74 SHEET 1 BF 5 INVENTORS CHARLES A. GOURLEY HARVEY N. KURTZ ATTORNEY PATENTEDJAN 1:924
  • the present invention relates to a solderless electrical connection system and, more particularly, to a system for mechanically mounting components upon a main mounting board,-for electrically interconnecting the components, andfor electrically connecting the interconnected components to external devices without requiring solder or other previously utilized technique.
  • the prior art typified by the above-referenced patent utilizes a connector, such as a board-edge connector, to provide the mechanical mounting between the mother board and the daughter board.
  • the board-edge connector mounts connector pins having wiping fingers for contacting conductive strips upon the daughter board inserted into the connector and'non-rounded opposite end sections extending from the connector.
  • the connectors are bolted upon the mother board while electrical connection from each daughter board is achieved by wrapping wire about the non-round end sections of the contacts within each connector.
  • solderless electrical contacts within -a mounting board.
  • these devices have relied on the principle of deforming the hole as the contact is inserted therein for generating the retention force.
  • This prior art solderless contact cannot be removed and reinstalled in the mounting board due to the destruction of the hole during the original deforming installation.
  • the prior art contacts also have a tendency to become less efficient over a prolonged period of time due to loss of both mechanical holding power and electrical continuity.
  • the loss of mechanical holding power is caused by the initial deformation of the mounting board which tends to continue long after the mounting of the contact, thus allowing the contact to loosened within the hole.
  • the loss of electrical continuity is caused when ambient atmosphere circulates between the contact and the hole opening allowing the development of corrosion therebetween.
  • Another object of the present invention is to provide an electrical connector system which may be assembled and reassembled for ease of service and which utilizes only those connector components necessary for the full circuit design.
  • Still another object of the invention described herein is to provide an improved solderless electrical contact which may be utilized without destroying the aperture into which the contact is placed.
  • a further object of this invention is to provide a solderless electrical contact for use within an electrical connector system which may be replaced when re- 2 quired without destroying the contact or the contact mounting board which receives that contact.
  • Still a further object of the invention described herein is to provide an improved solderless electrical contact which may be inserted in a mounting board by a relatively low insertion force, which cleans the aperture within the mounting board during insertion, which provides a gas tight seal between the aperture and the contact to prevent the deterioration of electrical continuity, and which does not loose its mechanical holding force due to aging.
  • an insulated mounting board having a plurality of apertures therein.
  • the mounting board may include single layer conductors or multi-layer conductors connected to selected apertures which are each coated with conductive material along the-inner surface.
  • a contact having a wedge locking central section is inserted into the desired apertures wherein the central section yields symmetrically about the longitudinal axis thereof for generating the desired holding force without distorting or destroying the aperture.
  • the contact consists of an end portion for mechanically mounting an electrical component while providing electrical continuity thereto.
  • the connector may further consist of a non-round end portion utilized for attaching wire thereto. The central section and end portions of the contact achieve mechanical and electrical mounting of electrical components without soldering, dip soldering, or other conventional means.
  • FIG. 1 is a perspective view showing a solderless electrical contact of the present invention prior to insertion within a mounting board;
  • FIG. 2 is a side elevational view of the solderless electrical contact
  • FIG. 3 is a front elevational view of the solderless electrical contact
  • FIG. 4 is a cross-sectional view taken along lines 44 of FIG. 3 showing the central section of the electrical contact
  • FIG. 5 is a cross-sectional view taken along lines 55 of FIG. 3;
  • FIG. 6 is a perspective view illustrating the solderless electrical contact embodied within an electrical connection system
  • FIG. 7 is a cross-sectional view showing the electrical contacts. of the present invention mounted in the mounting board with a protective guide in the desired position;
  • FIG. 8 is a perspective view, similar to FIG. 6, illustrating the solderless electrical contact of the present invention embodying a second arrangement of the electrical connection system;
  • FIGS. 9-14 are cross-sectional views, similar to FIG. 4, illustrating various embodiments of the central section of the solderless electrical contact.
  • FIG. 1 shows a solderless electrical contact 10 arranged to be placed within a mounting board or mother board 12 having an aperture 14 therein.
  • the mother board is constructed from an insulating material and provides the mounting member for the solderless electrical connector system of the present invention.
  • Each aperture 14 within the insulating material of the mother board is coated with a suitable conductive material 16, as by electroplating or other process to form plated-through holes.
  • the conductive material may also be formed in strips 18 upon the surface of the insulating mother board for electrically joining selected ones of the apertures 16.
  • the solderless electrical contact is formed in three sections. That is, a non-round end section 20, a wedge locking central section 22, and an electrical component mounting end section 24. These sections are formed from a flat mill stock of spring material, for example, phosphor bronze, having two cross-sectional thicknesses.
  • the non-round end section 20 is formed by stamping from the thicker cross-section having a thickness, for example, of .025 inches; while the central section 22 and mounting end section 24 are formed by stamping from a cross-section having a thickness of 0.007 inches, for example. From the stamped, mill stock thus described, the solderless electrical contact 10 is formed into the contact shown.
  • solderless electrical contact 10 is provided with a non-round end section 20 having a square cross-section, FIG. 5, about which wire conductors may be wrapped by suitable machinery. This arrangement eliminates the utilization of solder and provides adequate electrical connection between the electrical contact 10 and the wire conductors, not shown.
  • the central section 22 is formed just above the interface between the thick and thin portions of the mill stock. As seen in FIG. 4, the central section 22 is formed as an involuted C-shaped member having opposite ends of the C-shaped section turned inwardly and terminated at the approximate center line thereof to form leg elements 26. These leg elements 26 contact one another as the central section 22 of the contact 10 is inserted into the aperture 14. The closing of the C- shaped section causes each inwardly directed leg 26 to close against the inner surface of the central section in an even tighter loop. Thus, it will be seen that the initial insertion of the electrical contact 10 causes the central section 22 to close about the larger diameter of the cross-section until the leg elements 26 contact one another.
  • Detent 28 are formed within the central section 22 for locating the electrical contact 10 as it is inserted into'the aperture 14. The detents are approximately equally spaced about the periphery of the central section 22 with the center detent opposite the opening of the C-shaped central section.
  • a fourth detent 30 is utilized to retain the daughter board guide, as will be described hereinbelow.
  • the electrical component mounting end section 24 is formed as a generally flat portion of the mill stock with the lower end thereof or the end closest to the central section 22, curving into a semi-circular portion to join with the generally cylindrical shape of the involuted C- shaped central section 22. Extending upwardly and away from this semi-circular portion 32, the component mounting section is bent away from the longitudinal axis of the electrical contact 10 to form a spring contact section 34. The upper end of this spring section 34 is bifurcated by a slot 36 to form two electrical component contacting fingers 38. These fingers are bent back toward the longitudinal axis of the contact 10, at
  • tab members 40 The purpose of the tab members will be described hereinbelow.
  • FIG. 6 illustrates a single conductive strip 18 upon the surface of the mother board 12. Obviously, other strips may be placed upon this board or multi-layer conductive strips may be placed upon the board and connected to selected plated-through holes. This arrangement allows interconnection between various solderless electrical contacts 10 within apertures 14 for eliminating excessive electrical wiring. Further, a properly designed multilayer conductor board 12 could eliminate the need for the nonround end sections 20 of the electrical contacts 10 altogether.
  • the electrical contacts 10 are arranged in parallel rows with the component contacting fingers 38 of opposite contacts 10 facing each other. Between these fingers 38, a daughter board 44 having conductive strips 46 thereon may be inserted. The fingers 38 wipe against the conductive strips 46 as the daughter board is forced between oppo site electrical contacts 10. This forced motion causes the spring section 34 to yeild outwardly for generating holding forces which serve to hold the daughter board 44 in place and to establish electrical continuity with the conductive strips 46.
  • a daughter board guide member 48 is shown between the electrical contacts 10 and the daughter board 44.
  • This guide is constructed from insulating material and fits over the two parallel rows of electrical contacts 10.
  • the daughter board guide 48 is provided with a longitudinally extending slot 50 having shoulders 52 directed inwardly from opposite surfaces thereof and terminating in T-shaped ends 54.
  • the upper surfaces of the T-shaped ends 54 are inwardly and downwardly sloped to provide an initial guide for the daughter board 44.
  • the board is inserted into the slot 50 it contacts the fingers 38 causing them to yield outwardly.
  • the board is then urged downwardly until it contacts a stop 56 within the slot 50.
  • the stop 56 is provided with relieved portions 58 having a lower shoulder 60 over which the detents 30 snap as the guide 48 is urged downwardly over the contacts 10.
  • the contacts 10 are retained within the mother board 12 by the wedge locking central section 22 while the guide 48 is retained against the mother board 12 by the detents 30 and the shoulders 60 formed at the lower end of the relieved portions 58.
  • Each contact 10 is located between the shoulders 52 with the tab members 40 betweenthe T-shaped ends 54 and the inner wall of the slot 50.
  • the tabs 40 prevent the fingers 38 from extending inwardly beyond a point established by the tab 40 and ends 54.
  • a second solderless electrical connection system 62 is shown in FIG. 8 wherein the solderless electrical contacts 10 are mounted within a plurality of apertures 14 which are provided with plated-through coatings 16.
  • the non-round end sections 20 are illustrated as a square cross-section for wrapping wire thereabout without soldering.
  • the wedge locking central sections 22 and the electrical component mounting end sections 24 have been modified. In this embodiment, each central section 22 has been forshortened while the electrical component mounting end section 24 is expanded from the rolled, involuted C-shaped cylinder of the central section 22.into a box-shaped section 63 for forming the end section.
  • solderless electrical contact 10 has been described hereinabove as having a component mounting end section 24 with either contact fingers 38 or contact fingers 64 within a box-shaped section 63. It will be obvious that other terminations and arrangements are possible.
  • the solderless electrical contacts 10 could be provided with rounded end portions 69 for providing solderless electrical contacts that are mounted into the mother board 12 and form a plurality of pins within a male connector plug. This plug may then receive a typical female connector plug having pin receiving sockets therein.
  • the box-shaped component mounting contacts 10 be used to mount individual electrical components onto the mother board, such as a resistor 70.
  • FIG. 9 a further cross-sectional embodiment of the wedge locking central section 22 is shown.
  • the cross-section is formed as a simple C- shaped cross-section and provides adequate electrical continuity between the solderless electrical contact 10 and the conductive material 16 within the aperture 14.
  • the mechanical holding force generated by this cross-section is not as great as the force generated by the involuted C-shaped cross-section shown in FIG. 4.
  • the simple C-shaped cross-section of FIG. 9 may be utilized within a buss bar, for example, where a series of solderless electrical contacts are mounted within a common bar and inserted into a plurality of holes. In this arrangement, the holding force of each solderless electrical contact adds to the force of the others for providing adequate mechanical mounting of the buss bar.
  • FIG. 10 Another embodiment of the wedge locking central section 22 is illustrated in FIG. 10.
  • This cross-section is provided in the form of a pair of C-shaped crosssections 71 placed one beside the other with the adjacent leg of one joining the adjacent leg of the other.
  • the cross-section illustrated in FIG. 10 along with those illustrated in FIGS. 4 and 9 all provide a tight frictional contact against the inner surface of the conductive material coated over the aperture 14 for more than 180 and in the case of the cross-sections shown in FIGS. 4 and 9 over more than 270. These configurations prevent the ambient atmospheric from reaching the conductive material and thereby prevent corrosion therebetween.
  • FIG. 11 illustrates another cross-section of the central section 22 in the form of a V-shaped cross-section having a rounded bottom portion and involuted upper ends. This configuration provides three-point contact with the inner surface of the aperture 14.
  • FIG. 12 shows a further modification wherein a four-leaf clover configuration is shown.
  • Each of the cross-sections shown in FIGS. 11 and,12 yield inwardly toward the longitudinal axis of the contact as the contact is inserted into the aperture 14.
  • FIGS. 13 and 14 illustrate a second approach that provides a wedge locking central section for generating holding forces without destroying the aperture. These sections are formed by splitting a relatively thick central section 22 along its longitudinal axis for a limited distance.
  • the split cross-section is expanded or bowed to form opposite spring legs 72 which engage the aperture 14 as the contact is inserted therein and yield toward each other.
  • FIG. 14 illustrates a split section wherein legs 74, formed on opposite sides of the split, are vertically offset from each other. The opposing faces of each leg 74 formed by the split are then passed beyond one another such that the two legs 74 contact each other along the inner surfaces 76 thereof. As the contact is inserted. into the aperture 14, the two legs 74 yeild inwardly with their inner surfaces 76 frictionally engaging one another.
  • a typical mother board may vary in size, for example, two sizes presently used include 48 by 24 inches and 19 by 15 1a inches. These boards are designed to receive and interconnect the circuitry of several smaller print circuit boards or daughter boards.
  • the present invention enables the assembly, disassembly and reassembly of all components without creating the need for soldering, spot welding, or other forms of electrical connection. Through this arrangement, quick and economical field servicing is achieved. Further, the arrangement 'allows the assembly process to be simplified through a reduction of the number of pre-assembly and assembly chicks required. Since it is relatively simple to replace a single component, these components may be tested as assembled or assembled and then tested.
  • a typical mother board is often coated with conduc-.
  • solderless electrical contact shown in FIGS, 4, 9.and 10 are especially suited forinsertion into a aperture 14- in which solder has been concentrated. As the contact 10 is inserted, it wipes the hole 14 for cleaning out the excessive solder. During insertion, the central section 22 of the contact 10 yields and closes toward the longitudinal axis thereof.
  • the yielding of the spring material forming the contact generates holding forces therein which retain the contact within the aperture without distorting and thereby destroying the aperture.
  • the arrangement of the central section 22 illustrated in FIGS. 4, 9 and 10 further allows the outer walls of the central section to nearly completely contact the inner surfaces of the apertures 14. This large percentage of diameter contact creates a gas seal which prevents the ambient atmosphere from entering between the contact 10 and the aperture 14, thus preventing corrosion therebetween.
  • the present invention is utilized as an electrical connection system.
  • a printed circuit board or mother board may be fabricated today with multi-layer conductors.
  • these fabricated boards will not withstand the heat generated under normal soldering procedures as the heat destroys the multi-layer conductors.
  • the solderless electrical contact of the present invention must be utilized within this type of system.
  • the system approach of the present invention allows a circuit designer and manufacturer to design and fabricate a circuit or system of circuits that eliminates connectors normally required. That is, the guide 48 is provided only for the purpose of guiding the daughter board.
  • the change may be accomplished by simply removing the daughter board 44 from between the solderless electrical contacts 10, pulling the guide 48 off the contacts 10 and pulling each contact 10 from its aperture 14. As the apertures are not destroyed by the insertion or removal of the contact 10, the process may be reversed for replacing any of the parts or components previously removed.
  • the non-round end sections of the contacts 10 may be eliminated in some systems where a multi'layer conductor board is utilized.
  • solderless electrical contact 10 has been described and several alternate cross-sections of the central section 22 have been set out. However, it will be obvious that other combinations or substitutions are possible. Further, the system in which the electrical contact is embodied may be altered or varied utilizing combinations of the devices disclosed herein without departing from the scope of the present invention.
  • a solderless electrical connection system comprising:
  • an insulated mounting member having a plurality of apertures therein;
  • conductive contact means having a central section passing through said coated apertures
  • said central section formed from a flat cross-section rolled into a generally cylindrical shape friction engaging said coated apertures for electrically connecting said contact means to said conductive ma- 8 terialand for mechanically mounting said contact means in said insulated mounting member; said central section having extended detent means positioned beyond said insulated mounting member when said conductive contact means are mounted in said coated apertures; and guide member means having a shouldered recess wherein said recess receives said conductive contact means for positioning said detent means over said shoulder of said recess to removably mount said guide member upon said insulated mounting member.
  • a solderless electrical contact system comprising: insulated mounting means having a plurality of apertures therein; electrical conductive means coated upon the inner surface of said plurality of apertures; conductive contact means formed about a longitudinal axis having central sections for engaging said coated apertures; said conductive contact means having end sections at least one of which includes means for making electrical contact; said central sections of said contact means including first and second deforming means; said first deforming means of said central sections include oppositing portions each having a semicircular cross section connected at one end; and said second deforming means include rolled portions at the other unconnected end of each semi-circular portion, said semi-circular portions yielding and contacting each other at said unconnected ends as said contact means are inserted into said apertures, and said rolled portions at said unconnected ends yielding after contact of said unconnected ends as said contact means are further inserted into said apertures.
  • a solderless electrical-connector system comprising:
  • an insulated mounting member having a plurality of apertures therein; electrically conductive material coated upon the inner surface of said plurality of apertures and in strips upon said mounting member joining selected ones of said coated apertures; conductive contact means each having a longitudinal axis and a central section disposed within said coated apertures; said central sections of said conductive contact means each including a cylindrical member having a generally C-shaped cross-section, end portions of said C-shaped cross-section directed inwardly for forming opposite rolled end portions, said central sections yielding to allow said rolled end portions to contact each other as said contact means are ini tially inserted into said apertures and said rolled end portions yielding as said contact means are fully inserted into said apertures; electrical components including electrical conductive members; and said conductive contact means each having end sections including wiping means for contacting said conductive members of said electrical components and thereby supportably mounting said electrical components.
  • said electrical components include printed circuit boards having a plurality of electrically conductive strips thereon terminating at an edge thereof;
  • said end sections of said conductive contact means include wiping finger means contacting opposite sides of said edge of said printed circuit board at said electrically conductive strips for mechanically mounting said board while providing electric continuity to said conductive strips.
  • said electrical components include packages having a plurality of electrically conductive pins extending therefrom;
  • said end sections of said conductive contact means include box-shaped portions having wiping finger means extending inwardly from opposite sides of said box-shaped portions for mechanically engaging said electrically conductive pins and providing electrical continuity thereto.
  • a device for making electrical contact between a plurality of electrical conducting means comprising:
  • insulated mounting means having apertures therein; a first group of said plurality of electrical conducting means including conductive material coated upon the inner surfaces of said apertures and in strips upon said mounting means joining selected ones of said coated apertures;
  • contact means each including first and second end sections and a central section which engages said apertures
  • said first end section having a non-round crosssection about which a second group of said plurality of electrical conductive means may be wrapped;
  • said second end section having a flattened crosssection for wiping a third group of said electrical conducting means
  • said central section having a flat cross-section rolled into a generally cylindrically C-shape for friction engaging the coated inner surfaces of said aperture through which it passes, the ends of said C-shaped cross-section being rolled into second generally C- shaped portions for mechanically securing each of said contact means within said aperture and forming an electrical contact between said groups of said plurality of electrical conductive means.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US00107240A 1971-01-18 1971-01-18 Solderless electrical connection system Expired - Lifetime US3783433A (en)

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US10724071A 1971-01-18 1971-01-18

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US (1) US3783433A (ja)
JP (1) JPS5412982B1 (ja)
CA (1) CA942399A (ja)
FR (1) FR2122443B1 (ja)
GB (1) GB1354803A (ja)
IT (1) IT945123B (ja)

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US20170104284A1 (en) * 2015-06-08 2017-04-13 International Business Machines Corporation Pin attach converter
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Also Published As

Publication number Publication date
CA942399A (en) 1974-02-19
GB1354803A (en) 1974-06-05
FR2122443B1 (ja) 1978-02-10
DE2149315A1 (de) 1972-07-27
FR2122443A1 (ja) 1972-09-01
DE2149315B2 (ja) 1974-05-09
IT945123B (it) 1973-05-10
JPS5412982B1 (ja) 1979-05-26

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