|Publication number||US3825878 A|
|Publication date||Jul 23, 1974|
|Filing date||Sep 10, 1973|
|Priority date||Sep 10, 1973|
|Publication number||US 3825878 A, US 3825878A, US-A-3825878, US3825878 A, US3825878A|
|Inventors||C Finger, J Pausche|
|Original Assignee||Motorola Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (15), Referenced by (43), Classifications (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Finger et a1.
[ FLEXIBLE FLAT CABLE SYSTEM  Inventors: Carl Finger, Glenview; John W.
Pausche, Norridge, both of I11.
 Assignee: Motorola, Inc., Chicago, Ill.
 Filed: Sept. 10, 1973  Appl. No.: 395,475
 US. Cl 339/17 F, 339/61 M, 339/176 MF  Int. Cl. I1105k l/07  Field of Search 339/17 F, 17 L, 17 LM,
339/59, 61, 75 MP, 174, 176 MP, 176 MP  References Cited UNITED STATES PATENTS 2,858,515 10/1958 Thunander et al 339/59 M X 2,874,363 2/1959 Ainsworth 339/61 M X 3,065,445 11/1962 339/17 F UX 3,065,446 11/1962 Robb et a1. 339/17 F UX 3,076,166 1/1963 Raddin 339/75 MP X 3,202,955 8/1965 McKee 339/59 M 3,230,498 1/1966 Keys 339/75 MP X 3,319,216 5/1967 McCulloch 339/17 F X 3,489,990 l/l970 Parker et al. 339/75 MP 3,500,289 3/1970 Herb 339/17 F 3,602,870 8/1971 Willard 339/75 MP X 3,614,707 10/1971 Kaufmann et al 339/17 L X 3,629,787 12/1971 Wilson 339/176 MF X FOREIGN PATENTS OR APPLICATIONS 700,490 12/1953 Great Britain 339/17 F July 23, 1974 1,229,199 4/1971 Great Britain 339/176 MF Primary Examiner-Bobby R. Gay
Assistant Examiner-Lawrence J. Staab Attorney, Agent, or Firm-Eugene A. Parsons; Vincent Rauner A housing having an elongated slot therein with opposed parallel channels in the upper and lower surfaces adjacent the opening of the slot and parallel spaced apart ridges extending transverse to the longitudinal axis of the channels in the bottom surface of each of the channels. An elongated cylindrical, silicone rubber member having a diameter slightly larger than the width and depth of the channels positioned in each of the channels so as to extend slightly into the slot and a'flexible flat cable having a fold therein transverse to the parallel conductors and positioned in the slot between the resilient members with each conductor parallel to and overlying a ridge in the adjacent ABSTRACT channel. Said cable further defining openings between the conductors positioned in overlying relationship to the resilient members and a portion of the cable folded back over the housing and fixed in position by a a strip of plastic having openings therethrough to provide test point access to the conductors.
5 Claims, 4 Drawing Figures FLEXIBLE FLAT CABLE SYSTEM BACKGROUND OF THE INVENTION connectors have been devised for connecting the flat cables to the printed circuit boards. In general, much difficulty has been encountered in providing a solid, low resistance connection between each of the conductors in the cable and each point on the printed circuit board.
Ds st lrt gaqfthalrietert. In general, the prior art has attempted to include a springy material, such as the flexible plastic U-shaped insert described by McCullough in US. Pat. No. 3,319,216 entitled Connector for Flat Cables or the metal spring fingers described by Schneck in U.S. Pat. No. 3,102,761 entitled Electrical Connector for Flat Conductor Cable, to apply pressure to the conductors in the cable and press them against the contacts on the printed circuit board. However, where a solid elongated springlike member is incorporated it applies equal pressure along the entire cable and, since the nonconducting material between the conductors is at least as thick as the conductors, equal pressure along I the entire surface of the cable fails to provide a good contact/In the connectors utilizing individual metal spring fingers the costof the connector is relatively high and the device is relatively complicated to manufacture.
SUMMARY OF THE INVENTION The present invention pertains to a cable system including a housing having an elongated slot therein with a pair of opposed parallel channels in the upper and lower surfaces thereof adjacent the opening and parallel spaced apart ridges in the bottom surface of each of the channels extending transversally to the channel. A resilient cylindrical member having cross sectional dimensions slightly larger than the channel and positioned in the channel so as to extend slightly outwardly into the slot and a flat flexible cable having a fold therein transverse to the conductors positioned between the resilient members with their portions of the conductors overlying the resilient members and parallel with and overlying a ridge in the adjacent channel. The cable further defining openings between the conductors to facilitate individual movement of the conductors to afford compliance to said printed circuit board. A portion of the cable being folded back over the housing with a strip of material overlying the portion to maintain it immovable and a plurality of spaced apart openings through said strip in overlying relationship to bear portions of conductors to provide test point access to said conductors.
It is an object of the present invention to provide an improved flexible flat cable system.
It is a further object of the present invention to provide a connector for a flexible flat cable wherein the contact between the conductors of the cable and a printed circuit board inserted therein is improved.
It is a further object of the present invention to provide a flexible flat cable system which is simple and inexpensive to manufacture.
These and other objects of this invention will become apparent to those skilled in the art upon consideration of the accompanying specification, claims and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the figures, the numeral 10 generally designates an elongated housing having a generally rectangularly shaped cross section. The housing 10 is formed of two elongated sections 11 and 12 each of which is approximately one-half of the housing 10 and generally a mirror image of the other section. Each section 11 and 12 of the housing 10 is composed of a nonconducting material and may be formed, for example, by molding plastic or the like.
An elongated slot 15 is formed in the housing 10, in the embodiment illustrated at the junction of the sections 11 and 12, and extends into the housing 10 so as to define spaced apart surfaces 16 and 17. The width of the slot 15 is slightly greater than the thickness of a printed circuit board 20 (see FIG. 4) adapted to be inserted in connecting relation therein. Further, the depth of the slot 15 is sufficient to receive the edge of the printed circuit board 20 in firm physical engagement therein. The opening of the slot 15 is in a leading edge or surface 21 of the housing 10. First and second channels 25 and 26 are formed in the surfaces 16 and 17, respectively, of the slot 15 so as to be generally parallel with the opening or front surface 21 of the housing 10 and in overlying or opposed relationship with each other. The channels 25 and 26 entend approximately the full length of the slot 15 and have a generally rectangularly shaped cross section. The bottom surface of each of the channels 25 and 26 has a plurality of spaced apart, parallel ridges or corrugations formed therein. The ridges 30 extend generally transverse to the longitudinal dimensions of the slot 15 and channels 25 and 26. Further, the ridges 30 are positioned so that ridges in the channel 25 overlie ridges in the channel 26. I
A pair of elongated, cylindrically shaped, resilient members 35 and 36 are positioned in the channels 25 and 26, respectively. The length of the members 35 and 36 is approximately equal to the length of the channels 25 and 26 and the diameter of the members 35 and 36 is slightly greater than the width and the depth of the channels 25 and 26. Because the cross sectional dimensions of the members 35 and 36 is slightly larger than the cross sectional dimensions of the channels 25 and 26, the members 35 and 36 are frictionally engaged in the channels 25 and 26 and extend slightly outwardly into the slot 15. It should be understood that the members 35 and 36 are illustrated with a circular cross section but they might have substantially any convenient configuration, such as rectangular or trapezoidal. The members 35 and 36 should extend outwardly into the slot 15 from the channels 25 and 26 sufficiently so that the distance therebetween is smaller than the thickness of the printed circuit board 20. In the present embodiment the members 35 and 36 are formed of silicone rubber material which is highly resilient and has substantial memory so that it returns to substantially its original shape when the circuit board 20 is removed from the slot 15.
A flexible flat cable, generally designated 40, is formed of an elongated ribbon 41 of nonconducting material having a plurality of parallel spaced apart conductors 42 extending axially therethrough. A fold is formed in the cable 40 transverse to the conductors 42 and the fold is positioned in the slot 15 so that opposite sides thereof are adjacent and in overlying relationship to the surfaces 16 and 17 of the slot 15. The ridges 30 in the channels 25 and 26 are spaced apart a distance approximately equal to the spacing between the conductors 42 in the cable 40 and are positioned so that the portions of the conductors 42 in the cable 40 overlying the members 35 and 36 are in parallel overlying relationship to the ridges 30 in the adjacent channel 25 or 26 (see FIG. 3). A portion of the non-conducting material 41 in the cable 40 which insulates the portions of the conductors 42 overlying the resilient members 35 and 36 is removed to allow contact between the conductors 42 and a plurality of spaced apart contact areas 45 on the surface of the printed circuit board 20. When the printed circuit board 20 is inserted in the slot 15 the resilient members 35 and 36 are compressed slightly and the outwardly extending edges or surfaces of the ridges 30 impart pressure on the portions of the conductors 42 overlying the resilient members 35 and 36 tending to force the conductors 42 into tight physical and electrical contact with the contact areas 45. The depressed portions between the ridges 30 provide a substantially reduced pressure on the cable 40 at areas where electrical contact is not made so that insertion forced on the printed circuit board 20 can be substantially reduced. To further enhance the pressure applied to the cable 40 by the ridges 30, openings 46 are provided in the non-conducting material 41 between the conductors 42 in overlying relationship to the resilient members 35 and 36. The openings 46 allow movement of individual conductors 42 without transmitting the force applied thereon to the adjacent nonconducting material 41. Thus, a simple connector is formed which applies pressure to each of the individual conductors 42 for a low resistance contact with a printed circuit board 20 while requiring a relatively low insertion force for the printed circuit board.
A portion of the cable 40 is folded over the upper surface of the body and a strip 50 of nonconducting material, which may be similar to the material forming the body 10, is fixedly engaged in overlying relationship thereto by some means, such as screws 51. The screws 51 may also be utilized to hold the sections 11 and 12 in fixed engagement. The strip 50 has a plurality of spaced apart openings 52 therethrough, which openings 52 are positioned so that each overlies a different conductor 42 in the cable 40. Further, a portion of the nonconducting material 41 is stripped from the conductors 42 beneath the strip 50 so that bear conductors 42 are available in the openings 52. Thus, the openings 52 provide a readily available, test point access to the conductors 42 and, hence, to the contact areas 45 and components on the circuit board 20.
While we have shown and described a specific embodiment of this invention, further modifications and improvements will occur to those skilled in the art. We desire it to be understood, therefore, that this invention is not limited to the particular form shown and we intend in the appended claims to cover all modifications which do not depart from the spirit and scope of this invention.
1. A cable system comprising:
a. a flat flexible cable having a plurality of parallel spaced apart conductors extending longitudinally therethrough and maintained in position by a flexible, nonconducting material;
b. a connector housing having an elongated slot therein for receiving an edge of a printed circuit board, said slot opening outwardly along one side of said housing and extending inwardly to form sides, spaced apart a distance slightly greater than the thickness of the printed circuit board to be received therein;
. said housing further defining first and second channels opening into said slot and extending generally parallel with and spaced from the opening of said slot, said first and second channels being in opposite sides of said slot in generally parallel, opposed relationship;
d. the bottom surface of each of said channels having a plurality of parallel ridges formed therein extending transverse to the longitudinal axis of said channels and spaced apart approximately the same distance as the spacing between the conductors in the flexible cable;
e. first and second elongated, resilient cylindrical members having cross sectional dimensions slightly greater than the cross sectional dimensions of said channels in said housing and positioned in said channels so as to extend outwardly into said slot;
f. said cable having a fold therein extending transverse to the conductors with said fold being positioned in said slot so that the conductors extend into said slot between said resilient members with each conductor overlying and parallel to a ridge in said channels; and
g. said cable further defining elongated openings in the nonconducting material between the conductors and positioned adjacent said resilient members for providing movement of individual conductors.
2. A cable system as claimed in claim 1 wherein the resilient cylindrical members are formed from material including silicone rubber.
3. A cable system as claimed in claim 1 wherein the resilient cylindrical members have a round cross section with the diameter thereof being slightly larger than the depth and the width of the channels.
4. A cable system as claimed in claim 1 wherein the housing includes two generally mirror image halves with the junction extending axially along the slot.
5. A cable system as claimed in claim 1 including a portion of the cable extending outwardly from the slot folded back in overlying relationship to a side of the a different conductor in said portion of cable and the nonconducting material being at least partially removed from the portion of conductor in each of said openings so as to expose the portions of conductors.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2858515 *||Aug 12, 1954||Oct 28, 1958||Westinghouse Electric Corp||Electrical connector with resilient gripping means|
|US2874363 *||Sep 15, 1953||Feb 17, 1959||Merrill J Ainsworth||Electrical connector with flexible contacts|
|US3065445 *||May 26, 1960||Nov 20, 1962||Thomas & Betts Corp||Socket connector for flexible tape conductor cable|
|US3065446 *||Sep 29, 1958||Nov 20, 1962||Cannon Electric Co||Electrical connector for strip cable|
|US3076166 *||Sep 30, 1960||Jan 29, 1963||Monroe Calculating Machine||Electrical connector for printed circuit cards|
|US3202955 *||Mar 1, 1963||Aug 24, 1965||United Carr Inc||Electrical connector|
|US3230498 *||Feb 28, 1964||Jan 18, 1966||Harold J Mock||Multiplex conductor connector apparatus for printed circuits, multiple conductor tape, and the like|
|US3319216 *||Mar 25, 1965||May 9, 1967||Fischer & Porter Co||Connector for flat cables|
|US3489990 *||Jul 14, 1966||Jan 13, 1970||Litton Business Systems Inc||Multipurpose coupling device|
|US3500289 *||May 19, 1967||Mar 10, 1970||Thomas & Betts Corp||Connector for securing flat conductor cable to printed circuit boards|
|US3602870 *||Apr 30, 1969||Aug 31, 1971||Westinghouse Electric Corp||Connector apparatus for effecting electrical connections|
|US3614707 *||Oct 6, 1969||Oct 19, 1971||Siemens Ag||Electrical connector|
|US3629787 *||Jun 19, 1970||Dec 21, 1971||Bell Telephone Labor Inc||Connector for flexible circuitry|
|GB700490A *||Title not available|
|GB1229199A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3864012 *||Feb 22, 1974||Feb 4, 1975||John M Cutchaw||Electrical connector|
|US4023877 *||Oct 23, 1975||May 17, 1977||Burroughs Corporation||Means for coupling a connector cable to contacts on a substrate|
|US4269462 *||Sep 21, 1979||May 26, 1981||Thomas & Betts Corporation||Zero insertion force connector|
|US4468074 *||Apr 30, 1979||Aug 28, 1984||Rogers Corporation||Solderless connection technique and apparatus|
|US4509098 *||Feb 24, 1983||Apr 2, 1985||At&T Bell Laboratories||Electrical printed wiring circuit board construction|
|US4627676 *||Jul 18, 1984||Dec 9, 1986||Sharp Kabushiki Kaisha||Electronic assembly including integrated circuit package and liquid crystal display panel|
|US4636019 *||Nov 22, 1985||Jan 13, 1987||International Business Machines Corporation||Connector mechanisms|
|US4784615 *||Jan 7, 1987||Nov 15, 1988||Motorola, Inc.||Direct contact flexible circuit interconnect system and method|
|US4798541 *||Sep 2, 1987||Jan 17, 1989||Ncr Corporation||Right angle electrical connector|
|US4815979 *||Dec 23, 1987||Mar 28, 1989||Ncr Corporation||Right angle electrical connector with or without wiping action|
|US4832609 *||Nov 27, 1987||May 23, 1989||Eastman Kodak Company||Solderless circuit connection for bowed circuit board|
|US4907975 *||Dec 19, 1988||Mar 13, 1990||International Business Machine Corporation||Electrical connector utilizing flexible electrical circuitry|
|US5186632 *||Sep 20, 1991||Feb 16, 1993||International Business Machines Corporation||Electronic device elastomeric mounting and interconnection technology|
|US5433632 *||Aug 12, 1994||Jul 18, 1995||Minnesota Mining And Manufacturing Company||Flexible circuit connector|
|US5954536 *||Mar 27, 1998||Sep 21, 1999||Molex Incorporated||Connector for flat flexible circuitry|
|US6010359 *||Jul 8, 1998||Jan 4, 2000||Molex Incorporated||Electrical connector system for shielded flat flexible circuitry|
|US6039600 *||Oct 10, 1997||Mar 21, 2000||Molex Incorporated||Male connector for flat flexible circuit|
|US6067708 *||Dec 15, 1997||May 30, 2000||Ford Global Technologies, Inc.||Method of interconnecting a dual media assembly|
|US6077124 *||Oct 10, 1997||Jun 20, 2000||Molex Incorporated||Electrical connectors for flat flexible circuitry with yieldable backing structure|
|US6086412 *||Apr 22, 1998||Jul 11, 2000||Molex Incorporated||Electrical connector for flat flexible circuitry|
|US6146190 *||Jun 1, 1998||Nov 14, 2000||Molex Incorporated||Electrical connector assembly for connecting flat flexible circuitry to discrete electrical terminals|
|US6244890||Mar 27, 1998||Jun 12, 2001||Molex Incorporated||Male electrical connector for flat flexible circuit|
|US6688911||Dec 13, 2000||Feb 10, 2004||Molex Incorporated||Electrical connector assembly for flat flexible circuitry|
|US6739903 *||Aug 28, 2000||May 25, 2004||Yazaki Corporation||Connector structure|
|US7025626||Jan 14, 2004||Apr 11, 2006||Molex Incorporated||Electrical connector assembly for flat flexible circuitry|
|US7140899 *||Sep 28, 2005||Nov 28, 2006||Japan Aviation Electronics Industry, Limited||Connector easily enabling electrical inspection of contacts|
|US7503769 *||Jun 13, 2007||Mar 17, 2009||Ddk Ltd.||Connector and pushing jig|
|US9039441 *||Apr 13, 2012||May 26, 2015||Omron Corporation||Electrical connection terminal with continuity check portions and connector using same|
|US9172191 *||Jul 21, 2011||Oct 27, 2015||Saint-Gobain Glass France||Housing for electrical connection between a foil conductor and a conductor|
|US20050012212 *||Jul 17, 2003||Jan 20, 2005||Cookson Electronics, Inc.||Reconnectable chip interface and chip package|
|US20050153595 *||Jan 14, 2004||Jul 14, 2005||Fuerst Robert M.||Electrical connector assembly for flat flexible circuitry|
|US20060068627 *||Sep 28, 2005||Mar 30, 2006||Japan Aviation Electronics Industry, Limited||Connector easily enabling electrical inspection of contacts|
|US20070298645 *||Jun 13, 2007||Dec 27, 2007||Ddk Ltd.||Connector and pushing jig|
|US20120268137 *||Oct 25, 2012||Satoshi Takamori||Connector connection terminal and connector using the same|
|US20130224990 *||Jul 21, 2011||Aug 29, 2013||Saint-Gobain Glass France||Housing for electrical connection between a foil conductor and a conductor|
|USRE33604 *||Nov 30, 1987||Jun 4, 1991||International Business Machines Corporation||Connector mechanisms|
|CN100435423C||Sep 29, 2005||Nov 19, 2008||日本航空电子工业株式会社||Connector easily enabling electrical inspection of contacts|
|DE2920546A1 *||May 21, 1979||Nov 29, 1979||Rogers Corp||Loetfreie verbindung von elektrischen schaltkreiselementen|
|DE4318920C2 *||Jun 7, 1993||Jan 30, 2003||Whitaker Corp||Verbinder mit monolithischer Multikontaktanordnung|
|EP0415052A1 *||Jul 17, 1990||Mar 6, 1991||The Whitaker Corporation||An electrical connector|
|EP0908968A2 *||Sep 26, 1998||Apr 14, 1999||Molex Incorporated||Connector for flat flexible circuitry|
|WO1994017569A1 *||Jan 3, 1994||Aug 4, 1994||Minnesota Mining And Manufacturing Company||Flexible circuit connector|
|WO2000055944A1 *||Mar 17, 2000||Sep 21, 2000||The Boeing Company||Aircraft ground power connector|