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Publication numberUS3868163 A
Publication typeGrant
Publication dateFeb 25, 1975
Filing dateJul 23, 1973
Priority dateJan 31, 1972
Also published asCA1005130A, CA1005130A1, DE2303537A1, DE2303537B2, DE2303537C3
Publication numberUS 3868163 A, US 3868163A, US-A-3868163, US3868163 A, US3868163A
InventorsJarosek Gordon G
Original AssigneeLear Siegler Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bus bar
US 3868163 A
Abstract
A bus bar for electrically coupling a plurality of spaced-apart parallel terminal pins arranged in banks is constructed of flat strips of electrically conductive material. Internal longitudinal slits divide a portion of the strip into sections with every other section being deformed to form a first generally S-shaped bend and the remaining sections being deformed to form a second generally S-shaped bend oppositely directed from the first bend to define with a first bend a pair of passages capable of receiving terminal pins. The bus bar further includes indexing marks adjacent to each pair of the passages to facilitate the manufacture of the bar. The spacing between passage pairs is infinitely variable.
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United States Patent Jarosek 1 Feb. 25, 1975 [54] Bus BAR 2,981,926 4/1961 Boardman 339/256 SP 3,048,812 8/1962 Heidler 339/17 LC x 1 lnvemo" P Jamel" Westmmster, 3,439,315 4/1969 Hamel e1; 61.... 339/256 R x callf- 3,551,875 12/1970 Jarosek 339/19 [73] Assigneez Lear Siegler Inc" Santa Monica 3,558,289 1/1971 Cervenka et al 29/1935 Calif- FOREIGN PATENTS OR APPLICATIONS 22 Filed: July 23, 1973 1,321,959 2/1963 France 339/256 R 1,930,544 l/1970 Germany 339/256 R [21] Appl. No.: 381,578

Related US. Application Data [63] Continuation of Ser. No. 221,905, Jan. 31, 1972,

abandoned.

[30] Foreign Application Priority Data Jan. 31, 1972 Belgium 127130 Jan. 30, 1973 Denmark 491/73 Jan. 18, 1973 Great Britain 2664/73 Jan. 31, 1973 France 73.03353 Jan. 25, 1973 Germany 2303537 Jan. 22, 1973 Netherlands 7300894 [52] US. Cl 339/19, 339/22 B, 339/242, 339/256 R [51] Int. Cl H01! 31/08 [58] Field of Search 339/13, 19, B, 242, 339/252 P, 256, 276 SF; 29/193, 193.5; 113/119 [56] References Cited UNITED STATES PATENTS 2,688,735 9/1954 Hubbcll 339/95 R X Primary Examiner-Roy D. Frazier Assistant Examiner-Lawrence J. Staab Attorney, Agent, or FirmChristie, Parker & Hale [57] ABSTRACT A bus bar for electrically coupling a plurality of spaced-apart parallel terminal pins arranged in banks is constructed of flat strips of electrically conductive material. Internal longitudinal slits divide a portion of the strip into sections with every other section being deformed to form a first generally S-shaped bend and the remaining sections being deformed to form a second generally S-shaped bend oppositely directed from the first bend to define with a first bend a pair of passages capable of receiving terminal pins. The bus bar further includes indexing marks adjacent to each pair of the passages to facilitate the manufacture of the bar. The spacing between passage pairs is infinitely variable.

10 Claims, 8 Drawing Figures BUS BAR CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of US. Ser. No. 221,905, filed Jan. 31, 1972 and now abandoned.

CROSS-REFERENCE TO RELATED PATENT The bus bar herein is related to the bus bar disclosed and claimed in US. Pat. No. 3,551,875, granted Dec. 29, 1970, assigned to the same assignee as this application.

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to bus bars and more particularly to a bus bar adapted to be slidably secured to spaced-apart terminal pins arranged in banks and also to the manufacture of the bus bars.

2. State of the Prior Art In the design of electronic assemblies, such as are frequently employed in computers, communication equipment, etc., a great number of serially arranged spacedapart terminal pins require electric interconnections. Generally, these pins are arranged in parallel banks and secured to connectors. The connectors, in turn, connect the pins to printed circuit cards or similar hardware mounted on the connectors. Also, integrated circuits may be arranged to have rows of terminal pins.

Often a large number of such terminal pins must be electrically interconnected. In one prior art arrangement, centrally located flat bus bars were installed ad jacent the connectors and provided with a plurality of lugs. The terminal pins which were to be interconnected were then wired to the bus but and thereby electrically coupled. This approach required substantial assembly and installation work and generally required that each terminal pin be wired to a lug on the bus bar by means of a connecting wire and two solder joints. The great number of pins required in such interconnection, often ranging into the hundreds of thousands, necessitates a great amount of effort, time and expense in making such solder joints. Moreover, such joints frequently have inferior electric characteristics, such as higher resistance, when compared to the bus bar, the terminal pins and the connecting wires. In addition, such prior art connections require a substantial amount of space which in some cases is virtually unavailable or which can only be obtained by incurring additional expense. Furthermore, such prior art interconnections often make it difficult to locate trouble spots and, when located, require that solder joints be broken in order to do repair work. Other prior art arrangements include the use of a manually operated tool to wrap connecting wire around selected terminals and the use of clips affixed to terminal posts to fasten connecting wire between selected terminals. These latter approaches eliminate the need for solder connections to the pins but still require the use of connecting wire and the manual connection olthe connecting wire to the proper pins by an installer.

There exists, therefore, at the present time a need for a bus bar which is not only economical to manufacture but which is capable of substantially reducing installation, time and expense, which provides better interconnections, reduces the frequency of repairs, and facilitates the making of repairs, when necessary.

SUMMARY OF THE INVENTION The present invention provides a bus bar or connector for electrically coupling a plurality of spaced-apart pins of an electronic assembly. Briefly, it comprises a strip of electrically conductive material. Sections of the strip, defined by spaced-apart longitudinal slits, are permanently deformed to form first and second generally S-shaped bends oppositely directed which cooperate to define together a pair of passages capable of receiving terminal pins. The passages have a configuration complementary to the shape of the pins to provide guidance for the pins as they are moved relative to the connector and to establish electrical connections between the connector and the pins.

If the bus bar is installed in an electronic assembly in which undesirable voltages, noises, or other disturbances must be avoided, the bus bar may be shielded. Thin layers of insulating and conductive material are then applied to the exterior of the bar to provide such shielding. If the bus bar requires insulation only, this can be accomplished by a thin layer of insulating matc rial over the bar.

The bus bar of the present invention is simple and relatively inexpensive to manufacture. It can be mass manufactured by using index marks such as dimples on the strip at preselected intervals along the length of the strip. Longitudinal slits of preselected length are cut at these preselected locations along the length of the bar with respect to the indexing marks. The resulting sections are then deformed with every other strip forming a first generally S-shaped bend and the remaining strips being deformed into second generally S-shaped bends oppositely directed from the first bends. Thereafter, the bus bars are cut to the desired length.

BRIEF DESCRIPTION OF THE DRAWINGS vention and interconnecting two pairs of terminal pins;

FIG. 4 is a side elevation view of a portion of the bus bar shown in FIG. 3;

FIG. 5 is a cross-sectional view of the bus bar of FIG. 3 taken along section lines 55;

FIG. 6 is a cross-sectional view of the bus bar of FIG. 3 taken along section lines 6-6; and

FIGS. 7 and 8 are side elevation views of bus bars in accordance with this invention for connecting larger terminal pins.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1 and 2, an electronic assembly 10, for use in a computer or in communication equipment, for example, is mounted on a chassis 12 and includes a plurality of parallel, spaced-apart elec-. trical connectors 14. The connectors are of a conventional construction and are secured to the chassis by suitable fasteners such as screws 16. A'plurality of spaced-apart and parallel terminal pins 18 project from an underside 20 of the connectors 14. The chassis also includes guide elements 22 which slidably receive printed circuit cards 24 having terminals 26 which coact with the connectors 14 in a known manner. The printed circuit cards can; of course, be replaced by other electric componentswhich coact withthecom" nectors. Since the electronic subassernbly forms no part of this invention, it is not further described herein;

Alternatively, the'spaced apart and parallelterminal pins may be terminal pins of integrated circuitshaving,

for example, a dualin-line configuration.

When the connectors 14 are installed in the. chassis 12, the terminal pins 18 form banks of aligned terminal pins. with each connector 14 having a paircof terminal 7 pins in a common plane with pairs of terminal pins on 'As seen. inFlG; 4, the" generally S shaped bends of x in a passageway. that is symmetrical aboutthe longitudiother connectors that are to be'interconnected. These pairs form vertical columns. as viewed in FIG. 1. It fre-- qnently occursthat each pair in a vertical column must be electrically interconnected and this invention providcs bus bars 30 for electrically interconnecting the pairs of terminal pins .18 in a common plane.

The bus bar 30 will now be ,tlcscribcdwith reference to FIGS. I and 3 through 6..The bus bar 30 is a strip of conductive material that has an internal longitudinal slit 3] andan internal longitudinal slit .32 that divides 7 "1h addition toro lling the center section the side sections-34 and 35 are rolled to cause the. inner edges of these sections. tobe pushed away from the center section 33 to further facilitate the insertion ofterminal pins and to remove any burrs from the edges of these sections. l V

The sheet/is then. movedforward to the next index mark 43 andthe next pair of slits andpassages are formed. Afterthe desired number of passages are ereated in the'strip, the strip islcut to the-desired length to complete the bus bar. it

the center section 33 and edge section '34 and 35 result nal center line 5001 the b us'bar for a selected terminal pinsize. V V

For ease in manufacturing, where larger terminal pins are to be interconnected, the bend in the strips on one side of the, center line aremaintained the same distance from the center line .while the bends on the other side have an increased distance to accommodate... the largerterminal pin. This is shownin the side elevation view of the bus lbar and 70, respectively depicted in FIGS. 7 and 8. V

The number of slitsfin the'sheet of conductivematew V rialmay, of course, beincreased asdesired';

thcstrip into acenter section 33 and a pairofside sections 34 and 3.5. The slits 3i and 32,.have a length dependent upon the size ofthe terrn inal pinsto be inter connected in FIG, 3, a pair of terminal pins 36 and 37 are shown as being interconnected byjthe bus bar 30. The middle sections 33 are .permanentlypdeformed toform a first generally S-.shaped'bend,,most easily seen in=FIG; 4.

Similarly, the side seetions 34 and 35 are permanently. 1

deformed to form second generally S-shaped bends o'ppositely directed from the first bend, as seen in FIG. 4; The first and second bends cooperate to define to- I pins until the pins are gethcr a pair'of passages 41 and4-2 capable of receiving terminal pins having a preselected size with a force fit,

such as terminal'pins 36 and 37.The resulting configuration as viewed from the edge of the busbar 30'is a FIG. 8, 8, as shown in FIG. 4.

I The sharpness of the bends olthe strips'of the busban 30 is generally determined byithe size of the. terminal pin to be interconnected and the forming tool uscdyand I the configurations shown in the drawings are thus, illus- 50 To facilitate the manufacture of the bar 30, indexing trativeonly.

'markssuch, as dimples 43 are applied to the strip for subsequent location ofthe sections33, 34, and 35 to be deformed. The indexing marks 43 are applied at the.

time of slitting the strip. The dimples 43 are placed at preselected locations alongthebar as determined by r the variable spacing requirements between the terminal pins and also by the size of the terminalpins. Subse-.

With respect to the installation of al bus bar, a bar having theproper'length and spacingis first selected" 7 and laced adjacentthe free endsiof theterminal pins 18.The passageways4l and 42ofthe busfba'rf are aligned with the terminal pins andthe bar is thereafter forced towards and'intoflengagement with theterrninal positioned properly withinthe;

j The insertionofapinin passageway:4 1lor4'2 tends I to decrease the size of the adjacent passageway. Consequently the holding. forceyfon each terminal pin is incr'ea sed 'witharesultant improved bus .barQFor greater ease ininstalling the bus baronto the terminal pins, the latter preferably include tapered ends 54 (shown'in upon, .lnsitlls!isnsfth ast e?" FIG. 3) whichgradually spread'the center portions I What have been described are considered 'to be only illustrativeembodiments of the present invention. Ac-' cordingly. itis to be understood that various numerous l other arrangements maybe devised by one'skilled in the art. withoutdeiparting from thegspiritandgscope of 1 this invention. T s 5 5' i Wh t ss ainsdyis 1;.

V 1a" A strip of conductive material forinterconnecting one pair of terminal pins to other pairsofterminalpins spaced given distances apart comprising:

at least one longitudinal slit at eachlocation of a pair of terminal pins, all slits at each location being separated from all slits at eachcadjacentlocation and having a length determined bythe.selectedsize of k the terminal pins t o; be interconnected the slits at each location being separated from the slits at each adjacent location. and dividing the strip at each location into one more section than 7 there are slits at each location,

alternate sections at each location being deformed to form a first generally S-shaped bend, the remaining sections'at each location being deformed to form a second generally S-shaped bend oppositely directed fromthe first bend.

the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receiving a pair of terminal pins of the given size and wherein the insertion of a pin of the given size causes a decrease in the adjacent opening of the pair of passages, and the slits being of a selected length to provide a force fit for each terminal pin of the pair when both terminal pins are inserted. 2. A strip of conductive material in accordance with claim 1 wherein each passage of a pair is slightly smaller than the terminal pin whereby the insertion of a pin in one passage decreases the size of the adjacent passage of the pair.

3. A bus bar for forming electrical connections between paired terminal pins in a common plane and on the same side of the bus bar with the bus bar having a plurality of paired openings in the common plane, the bus bar comprising:

a strip of conductive material having slitted portions of selected length at selected places along the length of the strip,

each portion having at least one internal longitudinal slit of selected length determined by the size ofthe terminal pins to be interconnected that divides the strip within the portion into one more section than there are slits;

every other section in each portion being permanently deformed to form a first generally S-shaped bend;

and the other sections in each portion being permanently deformed to form a second generally S- shaped bend oppositely directed from the first bend,

the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receiving terminal pins from the same side with a force fit by decreasing the size of one passage when a pin of the given size is inserted in the adjacent passage of each pair; and

the slits at each slitted portion being separated from the slits at each adjacent slitted portion.

4. A bus bar in accordance with claim 3 wherein there are two internal longitudinal slits forming one center section and two side sections.

5. A bus bar in accordance with claim 3 in which the sections are so deformed that the passage defined by the first and second bends is substantially symmetrical about the longitudinal center line of the strip.

6. A bus bar in accordance with claim 3 in which the strip has a width transverse to the slits that is substantially greater than the maximum transverse dimension of the pin to be received. I

7. A bus bar in accordance with claim 3 in which the sections are so deformed that the passage defined by the first and second bends is offset with respect to the center plane within the plane of the strip for all pin sizes greater than a selected pin size.

8. An electrical connection comprising in combination:

a column of parallel electrical conductive pins; and

a strip of electrically conductive material generally lying in the plane of the column of pins and having a connecting passage associated with each pin,

each connecting passage being associated with one immediately adjacent connecting passage and being formed by one or more internal longitudinal slits in the strip that divides a portion of the strip into one more section than there are slits with every other section being permanently deformed to form a first generally S-shaped bend and the other sections being permanently deformed to form a second generally S-shaped bend oppositely directed from the first bend, the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receiving pins of a selected size from the same side with a force fit by decreasing the size of one passage when a pin of the selected size is inserted in the adjacent passage of each pair.

9. An electrical terminal assembly comprising:

a chassis;

a plurality of connectors for receiving printed circuit boards mounted on the chassis side-by-side in parallel relationship;

a plurality of spaced-apart parallel terminal pins arranged in-banks on each connector and extending the same direction from the connector;

a bus bar for interconnecting pairs of terminal pins in a common plane and on the same side of the bus bar. with the bus bar having a plurality of paired openings in the common plane, the bus bar comprising: a

a strip of conductive material having slitted portions of selected length at selected places along the length of the strip,

each portion having at least one internal longitudinal slit of selected length dependent upon the size of.

the terminal pins to be interconnected that divides the strip within the portion into one more section than there are slits;

every other section in each portion being permanently deformed to form a first generally S-shaped bend;

and the other sections in each portion being permanently deformed to form a second generally S- shaped bend oppositely directed from the first bend,

the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receiving terminal pins from the same side with a force fit by decreasing the size of one passage when a pin of the selected size is inserted in the adjacent passage of each pair;

and

each slitted portion being a selected distance from.

ing one pair of terminal pins to other pairs of terminal pins spaced given distances apart comprising:

at least one longitudinal slit at each location of a pair of terminal pins, all slits having a length determined by the selected size of the terminal pins to be interconnected,

the slits at each location being separated from the slits at each adjacent location and dividing the strip at each location into one more section than there are slits at each location,

alternate sections at each location being deformed to form a first generally S-shaped bend,

the remaining sections at each location being deformed to form a second generally S-shaped bend oppositely directed from the first bend,

the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receiving a pair of terminal pins of the given size and the slits being common to both passages of a pair of cooperating passages and extending the length of both passages.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 a 868 a Dated February 25 1975 Gordon G. Jarosek Page 1 of 4 Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 41., after "hundreds" delete "of" and insert -"'-or- Column 3, line 45, delete PIG. 9 and insert FIG. 8,

IN THE CLAIMS:

Column 4, line 51, after l." through Column 5, line 9, delete "A strip of conductive material. ..terminal pins are inserted." and insert.

. A trip of conductive material for interconnecting one pair of terminal pins to-other pairs of terminal pins spaced given distances apart comprising:

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,868 ,163 Dated February 25 1975 Inventor(s) Gordon G Page 2 of 4 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

at least one longitudinal slit at each location of a pair of terminal pins, all slits having a length determined by the selected size of the terminal pins to be interconnected,

the slits at each location being separated from the slits at each adjacent location and dividing the strip at each location into one more section than there are slits at each location,

alternate sections at each location being deformed to form a first generally S-shaped bend,

the remaining sections at each location being deformed to form a second generally Sshaped bend oppositely directed from the first bend,

the first and second bends being so positioned relative to each other to define together a pair of cooperating I passages capable of receiving a pair of terminal pins of the given size and the slits being common to both passages of a pair of cooperating passages and extending the length of both passages."

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 868 163 Dated February 25 1975 lnventofls) Gordon G. Jarosek Page 3 of 4 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 6, line 51, after "10." through line 72,

delete "A strip of conductive material. .the length of both passages" and insert A strip of conductive material for interconnecting one pair -of terminal pins to other pairs of terminal pins spaced given distances apart comprising:

at least one longitudinal slit at each location of a pair of terminal pins, all slits at each location being separated from all. slits at each adjacent location and having a length determined by the selected size of the terminal pins to be interconnected, I

the slits at each location dividing the strip at each location into one more section than there are slits at each location,

alternate sections at each location being deiormed to form a first generally S-shaped bend,

the remaining sections at each location being deformed to form a second generally S-shaped bend oppositely directed from the first bend,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. I 3 Dated February 25 1975 Gordon G. J'arosek v Page 4 of 4 Inventor (s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

the first and second bends being so positioned relative to each other to define together a pair of cooperating passages capable of receivin n n-pai of terminal pins of the given size and wherein the insertion of a pin of the given size causes a decrease in the adjacent opening of the pair of passages, and the slits being of a selected length to provide a force fit for each terminal pin of the pair when both terminal pins are inserted.

Signed and Scaled this seventeenth D ay 0f February 1 976 [SEAL] A ttest:

RUTH C. MASON C. MARSHALL DANN Attesling Officer Commissioner uflatenls and Trademarks

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2688735 *Mar 29, 1950Sep 7, 1954Harvey HubbellMultiple wire terminal for main and branched circuits
US2981926 *Nov 20, 1957Apr 25, 1961Hart Mfg CoBus bar
US3048812 *Jul 16, 1959Aug 7, 1962Burroughs CorpElectrical connector
US3439315 *Jul 17, 1967Apr 15, 1969Pacific Electricord CoElectrical contact strip
US3551875 *Mar 21, 1968Dec 29, 1970Lear Siegler IncBus bar
US3558289 *Feb 12, 1968Jan 26, 1971Cervenka Joseph JChain form clip
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3958200 *Jan 9, 1975May 18, 1976Guardian Electric Manufacturing CompanyBlade construction for relay
US4084870 *Mar 14, 1974Apr 18, 1978Sealectro CorporationMiniature matrix programming board
US4354727 *Aug 15, 1980Oct 19, 1982Heyman Manufacturing CompanyContact strip for electrical connector
US4383724 *Apr 10, 1981May 17, 1983E. I. Du Pont De Nemours And CompanyBridge connector for electrically connecting two pins
US4401354 *Jul 6, 1981Aug 30, 1983Buckbee-Mears CompanyLow cost bus strip
EP0041308A1 *Jun 2, 1981Dec 9, 1981E.I. Du Pont De Nemours And CompanyBridge connector for electrically connecting parallel pins
Classifications
U.S. Classification439/510
International ClassificationH01B5/00, H01R31/08, H01R9/05, H01R31/00, H01R24/00, H01B5/02, H01R43/20, H01R4/48
Cooperative ClassificationH01R31/085
European ClassificationH01R31/08B