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Publication numberUS3924918 A
Publication typeGrant
Publication dateDec 9, 1975
Filing dateOct 9, 1973
Priority dateOct 9, 1973
Also published asUSB404290
Publication numberUS 3924918 A, US 3924918A, US-A-3924918, US3924918 A, US3924918A
InventorsLindsay Carlton Friend
Original AssigneeDu Pont
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Daughter board contact
US 3924918 A
Images(1)
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Description  (OCR text may contain errors)

United States Patent 1191 18 3,924,918

Friend Dec. 9, 1975 [5 DAUGHTER BOARD CONTACT 3,701,071 10/1972 Landman 339/176 MP x 3,764,955 10/1973 Ward [75] Inventor gmdsay Carlton Fnend Camp 3,790,916 2/1974 Keitel 339/17 L x [73] Assignee: E. I. Du Pont de Nemours and m y E mine -R y az er Company, Wilmington, Del, Assistant ExaminerTerrell P. Lewis Filed: Oct. 1973 Attorney, Agent, or Fzrm-Thomas Hooker 21 Appl. No.2 404,290 57 ABSTRACT [44] Published under the T ial v l Protest An electrical connection between spaced and parallel Program on Januar 28, 1975 as document mother and daughter boards including terminals se- B 404,290. cured to the mother board and projecting toward the daughter board having a pivot link arm with a daugh- [52] US. Cl, 339/17 M; 317/101; 339/75 M; ter board-engaging member at the free end of the link 339/95; 339/176 MP; 339/275 13 arm and a daughter board spring contact. A number [5 1] Int, Cl. H01R 13/54; 1105K 1/04 of terminals are secured to the mother board all facing [58] Field of Search 339/17 M, 18, 75 M 91 in the same direction so that upon movement of the 339/174, 176 99, 97, 275 B 275 R 220 95 daughter board in a direction parallel to the mother board the links pivot the daughter board down toward [56] References Cit d the mother board and bring contact pads on the UNITED STATES PATENTS daughter board in engagement with the spring 3,066,367 12/1962 Garman 339/17 M x contacts 3,479,634 11/1969 Pritulsky 339/275 B X 4 Claims, 5 Drawing Figures US. Patent Dec. 9, 1975 3,924,918

DAUGHTER BOARD CONTACT The invention relates to a connection system for two parallel circuit boards, commonly referred to as mother and daughter boards. The daughter board is removably mounted on the mother board in electrical engagement with circuitry on the motherboard. Landman, US. Pat. No. 3,701,071 discloses a connector for fonning an electrical connection between spaced parallel mother and daughter boards. The invention disclosed herein is directed to a different type of connection system for parallel mother and daughter boards.

According to the invention, terminals are secured on the mother board and include link arms having hooks at the free ends of the arms engagable with the daughter board overlying the mother board. The terminals all include spring contacts so that when the daughter board is laid on top of the terminals and engages the hooks, lateral movement of the board pivots the board about the link arms and brings contact pads on the surface of the daughter board adjacent the mother board into engagement with the spring contacts on the terminals. The hooks hold the daughter board down. Additionally, other spring contacts may be secured to the mother board for forming electrical connections with other contact pads at desired locations on the daughter board. Latches or other types of detents may be provided for holding the daughter board in electrical engagement with the spring contacts of the terminals and the additional spring contacts.

Ohter objects and features of the invention will become apparent as the description proceeds, especially when taken in conjunction with the accompanying drawings illustrating the invention, of which there is one sheet.

IN THE DRAWINGS FIG. 1 is a perspective view of a terminal used for forming electrical connections between spaced parallel mother and daughter boards;

FIG. 2 is a sectional view taken through the terminal of FIG. 1 illustrating the mother and daughter boards with the daughter board in initial engagement with the terminal;

FIG. 3 is a view similar to that of FIG. 2 showing the mother and daughter boards with a terminal in electrical connection with a pad on the daughter board;

FIG. 4 is a view illustrating the mother and daughter boards with the daughter board in position to be mounted on the terminals on the mother board; and

FIG. 5 is a view, partially broken away, taken along line 5-5 of FIG. 3 illustrating the closed mother and daughter boards.

The daughter contact illustrated in FIG. 1 forms a physical and electrical connection between spaced and parallel mother board 12 and daughter board 14. The terminal 10 includes a base 16, a solder tab 18 extending from the base 16, a pair of supports 20 extending to one side of the base 16, a pivot link arm 22 extending at an angle from the edge of the base away from tab 18, and a pair of cantilever spring contact arms 24 to either side of the pivot link arm 22. A daughter board engaging hook 26 is provided at the free end of the link arm and electrical contacts are provided at the free ends of the cantilever spring arms 24. The terminal 10 is preferably stamp formed from sheet metal stock of high yield strength.

2 As illustrated in FIG. 4, a number of spaced terminals 10 are mounted on the mother board 12 with the solder tabs 18 of the terminals extending through circuit board holes 30 in the mother board and secured to printed circuit 32 on the bottom of the mother board by solder connections 34. The supports 20 of each terminal rest flush on the top of the mother board to prevent movement of the base during the formation of the electrical connections between the mother and daughter board. The terminals 10 are mounted on mother board 12 so that the pivot link arms 22 and cantilever contact arms 24 all extend in the same direction. As illustrated in FIG. 4, the arms. all extend to the right hand side of the mother board.

In addition to terminals 10, a number of individual contact terminals 36 are also secured to the mother board 12. Each of these terminals includes a solder tab 38 extending through a circuit board hole and soldered to printed circuitry 40 on the bottom of the circuit board of the mother board, and a single cantilever spring arm 42 joining the tab and extending away from the top of the mother board in the same direction as the link and spring arms of terminals 10. As illustrated in FIG. 4, the contact arms 42 also extend to the right of the mother board. Contacts 44 are provided at the free ends of the spring arms 42. Spring arms 42 are the same length as arms 24.

Daughter board latches 46 are secured to the edges of the mother board 12 and include daughter board receiving recesses 48. The terminal arms 22 and 24 and contact arms 42 normally project above the lower edges of recesses 48.

As shown in FIG. 4, the terminals 10 are spaced from each other on the mother board 12. Hook-receiving openings 50 are provided in the daughter board with an opening above each terminal 10. Contact pads 52 to either side of openings 50 are provided for electrical connection with the contacts 28 on arms 24. Additionally, a number of contact pads 54 are provided on the daughter board in position for forming electrical connections with the contacts 44 of contact arms 36.

The daughter board is brought into electrical connection with the mother board by first positioning the daughter board parallel to and above the mother board with the hooks 26 of terminals 10 extending through the openings 50 so that they engage the top of the daughter board. In this position, the daughter board rests lightly upon contacts 28 and 44. The daughter board is then pushed to the right so that it pivots about the link arms 22 of the spaced terminals 10 and is brought down toward the mother board so that the spring arms 24 of terminals 10 and the arms 42 of contacts 36 are bent down and stressed and their respective contacts 28 and 44 are biased against the contact pads 52 and 54 on the daughter board. Terminals 10 are bent at each end of link arms 22. Thus, the daughter board is pivoted to one side and moved down about the arms 22 toward the mother board and engages flexible latches 46. The latches are bent outwardly from the mother board and then snap back to secure the daughter board in the position of FIG. 5 with daughter board contact pads 52 and 54 in electrical connection with the arms 24 and 36 of the mother board. The daughter board may be released from the mother board by opening the latches 46.

While terminals 10 disclosed herein include a single link arm 22 and a pair of contact arms 24, it is obvious that connections may be formed between the mother 3 and daughter boards as disclosed through the use of a contact and connection system having a number of link arms and a number of contact arms, whether or not the contact arms are integral with the link arms.

While I have illustrated and described a preferred embodiment of my invention, it is understood that this is capable of modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

What I claim as my invention is:

l. A daughter board contact system comprising a mother board, a number of terminals secured to the mother board in spaced relation and extending from one side thereof with each terminal including a linkarm and a daughter-board engaging hook at the free end of the arm, a number of spring contacts extending outwardly of said side of the mother board, a daughter board having a number of hook-receiving openings thereon and contact pads on one side thereof for form- 4 ing electrical connections with said spring contacts, the hooks engaging said openings so that the arms space the mother and daughter board relative to one another and said spring contacts being biased against said pads to form electrical connections between the mother and daughter boards, and means holding the mother and daughter boards together against the spring force of the spring contacts.

2'. A daughter board contact system as in claim 1 wherein said means comprises flexible latches mounted on the mother board and engagable with the daughter board.

3. A daughter board contact system as in claim 2 wherein said link arms normally extend away from the mother board at an acute angle.

4. A daughter board contact system as in claim 2 including a spring contact arm integral witheach link arm.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3066367 *May 23, 1957Dec 4, 1962Bishop & Babcock CorpPanel mounting fastener
US3479634 *Oct 25, 1967Nov 18, 1969Amp IncPrinted circuit board connectors
US3701071 *Jan 18, 1971Oct 24, 1972Berg Electronics IncHinge type circuit board connector block
US3764955 *May 17, 1972Oct 9, 1973Amp IncConnecting and mounting means for substrates
US3790916 *Aug 3, 1972Feb 5, 1974Gte Automatic Electric Lab IncEdge mount connector terminal
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3993383 *Jun 2, 1975Nov 23, 1976Vincent MarinoPrinted circuit electrical connectors
US4316235 *Mar 31, 1980Feb 16, 1982Motorola, Inc.Movable printed circuit board display
US4412712 *Oct 23, 1981Nov 1, 1983Gte Automatic Electric Labs Inc.Circuit board positioning arrangement
US4538210 *Mar 29, 1983Aug 27, 1985Siemens AktiengesellschaftMounting and contacting assembly for plate-shaped electrical device
US4635325 *Jul 16, 1985Jan 13, 1987Kitagawa Industries Co., Ltd.Substrate fastener
US4635326 *Jul 16, 1985Jan 13, 1987Kitagawa Industries Co., Ltd.Substrate fastener
US4858074 *Apr 22, 1988Aug 15, 1989Power Compact, Societe AnonymeMethod of assembling power circuits and control circuits on several levels in the same module and a module thus obtained
US4930047 *Sep 12, 1988May 29, 1990The Toro CompanyApparatus for interconnecting components of a power outlet strip
US5096427 *Jan 31, 1991Mar 17, 1992Thomas & Betts CorporationSocket and header electrical connector assembly
US5173842 *Sep 27, 1991Dec 22, 1992International Business Machines CorporationElectrical assembly with deformable bridge printed circuit board
US5199879 *Feb 24, 1992Apr 6, 1993International Business Machines CorporationElectrical assembly with flexible circuit
US5236098 *Mar 13, 1992Aug 17, 1993Thomas & Betts CorporationSocket and header electrical connector assembly
US5484964 *Feb 6, 1995Jan 16, 1996Dawson, Deceased; Peter F.Method of forming an electronic interconnection structure
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US5687476 *Jan 19, 1996Nov 18, 1997Robertshaw Controls CompanyMethod of making printed circuit arrangement
US6252175 *Sep 16, 1999Jun 26, 2001Igor Y. KhandrosElectronic assembly comprising a substrate and a plurality of springable interconnection elements secured to terminals of the substrate
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US6538214May 4, 2001Mar 25, 2003Formfactor, Inc.Method for manufacturing raised electrical contact pattern of controlled geometry
US6688892 *Jul 25, 2002Feb 10, 2004Renesas Technology Corp.Clip-type lead frame for electrically connecting two substrates or devices
US6818840Nov 7, 2002Nov 16, 2004Formfactor, Inc.Method for manufacturing raised electrical contact pattern of controlled geometry
US7051432 *Mar 31, 2004May 30, 2006Elster Electricity, LlcMethod for providing an electrical connection
US7082682Sep 10, 2004Aug 1, 2006Formfactor, Inc.Contact structures and methods for making same
US7128579 *Aug 19, 2005Oct 31, 2006International Business Machines CorporationHook interconnect
DE3531967A1 *Sep 7, 1985Mar 20, 1986Kitagawa Ind Co LtdHolder for printed-circuit boards, carrier of electronic components or the like
EP0092086A1 *Mar 31, 1983Oct 26, 1983Siemens AktiengesellschaftConnection assembly for a plate-like electrical device
Classifications
U.S. Classification439/75, 361/784, 361/776, 439/329, 439/876
International ClassificationH05K3/32, H05K3/34, H05K3/36
Cooperative ClassificationH05K3/325, H05K2201/10871, H05K2201/0311, H05K3/3447, H05K3/368, H01R12/714
European ClassificationH01R23/72B, H05K3/36D
Legal Events
DateCodeEventDescription
Jan 21, 1997ASAssignment
Owner name: BERG TECHNOLOGY, INC., NEVADA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:E.I. DU PONT DE NEMOURS AND COMPANY;REEL/FRAME:008321/0185
Effective date: 19961209