Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/02—Soldered or welded connections
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
  • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
  • H01R4/2445—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
  • H01R4/2462—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the contact members being in a slotted bent configuration, e.g. slotted bight
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/02—Soldered or welded connections
  • H01R4/023—Soldered or welded connections between cables or wires and terminals
  • H01R4/024—Soldered or welded connections between cables or wires and terminals comprising preapplied solder
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
  • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
  • H01R4/242—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members being plates having a single slot
  • H01R4/2425—Flat plates, e.g. multi-layered flat plates
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
  • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
  • H01R43/0207—Ultrasonic-, H.F.-, cold- or impact welding
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
  • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
  • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
  • H01R4/2445—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives

Definitions

• the present invention relates to a method and product for terminating electrical conductors and in particular to a method and product which combine insulation piercing and solder technology.
• I DC insulation displacement correction
• soldering and crimping with IDC now becoming more widely used because of productivity improvement implicit in the technique.
• the advantages of solder include a potential for excellent reliability and low cost, when performed properly and employed in large volume production utilizing sophisticated soldering equipment where the solder process can be controlled rather exactly and the parts can be readily designed to fit the process .
• hand soldering can be and is widely utilized . It is there that the five variables in soldering become most critical and sensitive to variability.
• Totally neutral acids which may be preferred for the foregoing reasons , may not break through the surface oxides intrinsic to the metal surfaces of the parts or those oxides intrinsic to the metal surfaces of the parts or those oxides developed in time by the environment and duration of inventory.
• Pores and fractures in a solder joint evidence an over application of heat caused by sudden out gassing .
• Lumpy appearance and cold joints evidence too little heat. In pot or wave solder baths , surface dross can and does plague all operations.
• crimping is usually performed by pressure application , in a tool , on a portion of a metal terminal to inelastically deform such about a bare electrical wire.
• the terminal/tool system assures excellent terminal /wire joints repeatedly with little skill required .
• Crimping typically takes a great deal of energy and even with small wires/terminal crimps can demand 70 to 100 inch pounds of work with die forces frequently exceeding 1000 to 1500 pounds . Larger sizes of terminal /wire indeed require forces of many thousands of pounds.
• crimping usually calls for precision displacement of dies to effect the necessary deformation and tolerances between 0.001 and 0.003 inches are not uncommon. Thus high force and close tolerance characterizes most quality crimps.
• high forces and close tolerances mean precision die surfaces and precision tool linkages which inescapeably mean cost. Additionally, high forces call for tooling dies that are quite strong and capable of bearing repeated forces and frictional engagements of the metal deformation of terminals . That fact dictates a certain size limitation , width and height, beef, if you will , limiting how close terminals may be fixed in connectors and still be crimped by practical dies. It limits how many wires can be crimped simultaneously without having to have a multi-ton force mechanism such as a press . In a word , high force, precision and size of crimping dies all act as major recognized limitations on crimping as a termination technology.
• a second aspect of I DC relates to the situation where, by the use of insulation displacement, improved productivity could be obtained due to the fact that relatively large multiples of wires could be terminated simultaneously, essentially because the forces of termination are relatively low, being measured in the tens of pounds for wire gages on the order of 18 to 26 AWG , rather than in hundreds of pounds or thousands of pounds as in the case of crimp technology.
• IDC use has been more spurred by increased productivity than by merely its advantage in stripping insulation .
• Productivity improvements utilizing I DC have resulted in labor cost reductions per termination on the order of 50 to 70 percent, particularly where the IDC concept is employed in pre-loaded multiple connectors.
• I DC The main problem with I DC is a preception that what goes in easily comes out easily. Despite efforts to allay this perception by fixes with metal or plastic insulation gripping structures , many users have refrained from employing I DC technology. The success and reliability of proven solder and crimp technology has , to some extent, intimated the use of I DC concepts. For a good overall understanding of the I DC technology, reference is made to AMP I ncorporated publication HB5351 , revision B , " Introduction to AMP Insulation Displacement Techniques and Products published by AMP I ncorporated, " Copyright 1976, 1979 by Arlen Crandall .
• solder can be an excellent electrical terminal terminating technique but one must control the five critical factors or else suffer bad joints , crimp works well with little skill but takes high forces and precision tooling and is limited in center-to-center application and for multiple wire applications; and I DC gives productivity increases and self stripping but can come apart if one can pull or push the wire out of the slot that is the basis of the technology.
• the present invention gains the benefits of solder while building in control of the five critical parameters of soldering technology and at the same time gains the benefits of IDC in terms of self-stripping and mass termination for high productivity; all with an excellent termination of electrical conductors and particularly of wires to terminals .
• An object of the invention is to provide a better way to terminate wires, cables and multiple electrical conductors through automatic stripping , cleaning , fixturing , solder placement and force application as to the interfaces which are intended to be joined by solder reflow.
• a further object is to provide an article, method , and product process which embraces joining electrically conductive elements through the use of heat to reflow solder and solder like substances .
• the present invention embraces providing an electrical terminal , which includes at least one slotted portion to receive an insulated wire with the slot dimensioned to strip away insulation and/or oxides or other films from the wire surfaces and the surfaces of the terminal , and holding the fixturing such wire while heat is applied to the slotted portions to cause solder or solder like, substances proximate to the slot to melt and flow around the wire and the slotted portion to provide a joint of terminal and wire.
• the solder is placed on the terminal as a coating or skin in a thickness to provide just the right amount to effect a proper joint. It has been discovered that the combinations of a slot having edges and a wire stuffed therein operates reliably to cause wicking of the melting solder toward the slot wire contact area .
• FIGURE 1 is a perspective view of one form of the invention showing a slotted portion of a terminal with an electrical wire poised for insertion;
• FIGURE 2 is a side elevation of the structure of Figure 1 showing the wire being inserted into the slot by a tool ;
• FIGURE 3 is a perspective view of the structure Figure 1 after the wire has been inserted;
• FIGURE 4 is a side elevation of Figure 3;
• FIGURE 4A is a perspective view of a wire which had been inserted and withdrawn to show deformation caused by the slot
• FIGURE 5 is a perspective view, similar to Figure 3 after solder reflow
• FIGURE 6 is a side elevation , similar to Figure 4, after solder reflow
• FIGURE 7 is a vertical section through the terminal of Figure 6;
• FIGURE 8 is a perspective view of an alternate terminal structure terminating stranded wire
• FIGURE 9 is a vertical section through the terminal of Figure 8 after solder reflow;
• FIGURE 10 is a perspective view of another alternate structure with an insulated wire exploded therefrom;
• FIGURE 1 1 is a perspective view, similar to Figure 10, with terminal wire fully inserted;
• FIGURE 12 is a side elevation , partially in section , of the terminal of Figure 1 1 ;
• FIGURE 13 is a side elevation , similar to Figure 12 , showing the termination after solder reflow.
• FIGURE 14 is a side elevation , similar to Figure 13 , of another alternate embodiment of a terminal incorporating the present invention.
• FIGURE 15 is a perspective view of a strip of terminals formed to utilize the present invention.
• FIGU RE 16 is a perspective view of a single terminal from the strip of Figure 15;
• FIGURE 17 is a perspective view of a connector of a type suitable for use with the present invention.
• FIGURE 18 is a side elevation , partially in section , of the connector of Figure 17 in an electromagnetic heating device to effect solder reflow;
• FIGURE 19 is a perspective, partially broken away , of a terminal and inserted wire prior to solder reflow
• FIGURE 20 is a vertical section through the terminal of Figure 19;
• FIGURE 21 is a vertical section , similar to Figure 20, early in the cycle of heating for solder reflow;
• FIGURE 22 is a vertical section , similar to Figures 20 and 21 , at the completion of solder reflow.
• Figure 1 shows a conductor engaging portion of an electrical terminal 10 formed by an upstanding plate portion 12 defining a pair of sharp tines 14, 16 with a slot 18 therebetween and a tapering entry 20 leading to the slot.
• the terminal can be of any known type, such as that described in U . S. Patent No. 4,040,704, the disclosure of which is incorporated herein by reference.
• An electrical wire 22 formed by a conductor 24 covered by an insulative layer 26, is poised above slot 18. The end of the wire 22 has been stripped of the insulation 26 so that the conductor 24 is bare.
• the conductor 24 is a solid copper conductor suitably tin plated in accordance with practice in the art of wire manufacture.
• the terminal slotted plate portion 12 is intended to represent the conductor engaging portion of an electrical terminal 10 which is stamped and formed of conductive metallic sheet stock having spring properties such as brass , phosphor bronze, or beryllium copper.
• the wire 22 can represent an AWG table wherein the diameter of the conductor 24 is roughly 0.010 thousands of an inch with the outer diameter of the insulation 26 being 0.020 thousands of an inch .
• Slotted plate structures like that shown in Figure 1 include a height H which is sufficient to define a slot 18 of depth SD allowing for the insertion of the conductor 22 as indicated in Figures 2 , 3 , and 4 with the conductor 22 being scrubbed by insertion in the slot 18 as it travels therealong .
• the width dimension SW of the slot 18 can be considered in the range between 40% to 80% of the diameter of the conductor 22.
• the beveled entry area at the top of plate portion 12 is rendered at an angle 3 which is intended to guide or center insertion of the wire 22 so that the conductor 24 ends up in the slot 18 without being cut off or unduly deformed or pinched .
• Figure 2 shows in side elevation , partially in section a typical installation tool 28 which contains a slot 30 which fits over plate portion 12 and is arranged to press the wire 22 down into the slot 18 , as shown in Figures 3 and 4.
• the length of the slot 18 is such that the conductor 24 can be moved therealong for between ⁇ to 2 times the diameter of conductor 24 without bottoming the slot 18 so as to be unduly pinched or deformed and yet to get a good scrubbing and wiping action to remove, in the case of the embodiment heretofore discussed , oxide films on the conductor 24 by a mashing and inelastic deformation of the bulk of the conductor smearing , spearing and deforming the in coating thereon and generally scrubbing the surfaces thereof along with the inner surfaces of the slot 18.
• Figure 4A shows a kind of permanent deformation of conductor 24 which results from proper proportioning of the width SW of the slot 18 relative to the diameter of the conductor 24.
• IDC the structure of plate 12 is designed to have dimensions H , T and SW such that when a conductor 24 is stuffed or forced into the slot 18, the plate 12 is elastically deformed transversally to the slot 18 to store energy and maintain a forceful engagement with the conductor 24 and the surfaces of slot 18 throughout the life of the resulting connection . What this means is that there is sufficient stored energy to accommodate the inelastic creep that results. If the plate 12 were perfectly rigid and gave not at all there would be no reserve energy and no follow up displacement to maintain the engagement with the wire or conductor 24, other than that within the conductor 24 itself which , because of its dimensions , is relatively less than could be stored in the plate 12.
• the purpose of the slot 18 and plate 1 2 is to strip away insulation 26 or oxide films , to rub and scrub the relative engaging surfaces of conductor 24 and slot 18, and to fixture the conductor 24 within slot 1 8 in a firm manner.
• stored energy and displacement force from plate 12 to conductor 24 and the surfaces thereof are not only not necessary, but should be limited where possible and practical .
• the reason for this is that the present invention relates to a solder or eutectic joint and stored energy, once this is accomplished , can only create stresses which are undesirable.
• a coating 32 which represents a solder or eutectic coating , on at least the plate portion 12 of the terminal 10.
• This coating may be effected in a number of ways, preferably by electro plating in a manner to keeping slot 18 clear, or reasonable clear , and the edges that define the slot sufficiently sharp to do the job of oxide and insulation film or covering displacement.
• the coating 32 is shown in Figures 1-4 as covering the entire surface of plate portion 12 and in practice this has been done with respect to various samples .
• the material of the terminal 10 was BeCu 145 , i hard . It was prepared by cleaning using standard electro plating practices and the plating applied was a 63/37 tin lead eutectic having a liquid temperature of 361 °F, with no pasty range. With the foregoing dimensions a coating 32 of 0.001 inches in thickness was found to be sufficient to effect the job of soldering the conductor 22 to terminal 10. Coating of thicknesses of 0.002 and 0.003 inches were also utilized with good results . The coating of 0.001 inches was found to be enough and the coating of 0.003 inches was found to be not too much . Electro deposited tin lead eutectic of 90/10 type having a 361 °F-421 °F range was also tried with adequate results, but the 63/37 eutectic is preferred .
• eutectics and solder coatings 32 which may not extend over the entire surface of terminal 10, but may be selectively applied as by masking . It is also contemplated that eutectics may be applied by laminating , molten dipping , printing , silkscreening , plating , spraying , inlaying , mechanical attachment or the like. Those skilled in the art will also appreciate that it is preferable to apply the solder after forming the terminals as normal tin lead solder will rapidly dull dies. Turning now to Figures 5 through 7, the terminal of
• Figures 1 through 4A is shown after application of heat to cause reflow; whereas in Figure 5 the heat has caused the coating 32 to melt and concentrate around slot 18 and the conductor 24 of wire 22.
• Figures 6 and 7. A number of explanations have been made for why this flow of solder to the site of engagement of the conductor and slot occurs. Capillary, meniscus , surface tension are terms that have been used to describe this phenomenon . Suffice to say it does happen and it happens regardless of the attitude of the wire 22 and terminal 10 or the influence of gravity to result in a reliable and excellent electrical and mechanical termination of the conductor 24 to the terminal 10.
• liquid temperature of the coating 32 was approximately 361 °F
• sufficient heat was applied to result in the soldering action in a number of different ways .
• a jet of hot nitrogen was used to effect the solder reflow .
• hot oil having a temperature well in excess of the phasing temperature of the eutectic, may also be employed.
• resistance heating infrared , laser and as will be described in detail hereinafter, a type of eddy current heating resulting from the focusing of electromagnetic alternating fields may be used.
• FIGs 8 and 9 show an alternate terminal 34 terminating a stranded wire 36 applied in accordance with the invention .
• This terminal has a folded slotted plate portion similar to that described in U . S. Patent No. 4, 261 ,624, the disclosure of which is incorporated herein by reference. It has been found that the invention is particularly useful with respect to pre-tinned stranded wire. Referring back to Figure 1 , the reason is that in many of the commercial I DC structures which have been used over the years the practical thickness W of the plate portion 12 is thin enough to cut strands when taken with the width SW of the slot necessary to generate stored energy onto the stranded wire to effect an I DC connection .
• the slot width SW and the thickness T have been designed to cut through or break through insulation resulting in a structure which tends to cut stranded conductors . This is particularly true with respect to multiple wire termination where the placement of the wire is less than in the application of one wire into one slotted plate.
• Figure 9 shows that the solder coating will reflow filling the void between the folded plates of this embodiment while securing the stranded wire therein.
• terminal embodiments shown in Figures 8 to 14 are three alternates or variations of the invention wherein the termination portion is made to receive an insulated wire having a conductor surrounded by insulation .
• the slotted plate portion is folded over to include a U-shaped portion .
• the embodiment of Figures 8 and 9 provides a redundancy of interface formed by a pair of plates 38 , 40 connected by bights 42 ,44, each plate defining a slot 46,48, a much larger interface and allows for a different type of application of the coating .
• the solder coating 50 can be applied only to the inside region between the plates 38 ,40.
• the coating 50 can be pre-applied as a stripe, or stripes , by either selective electro-plating or inlaying of a solder pre-form roughly 0.001 inches thick.
• the bights of this embodiment are closed tightly so that reflow tends to wick between the interior surfaces .
• Figures 10 to 13 show a further embodiment of the present invention wherein the terminal 52 includes a folder over plate similar to the embodiment of Figures 8 and 9.
• the plates 54 ,56 have upper portions 58 ,60 connected by bights 62 ,64 and doubles over and lower portions 66,68 which are spread apart.
• the plates 54,56 include slots 70 ,72.
• This embodiment is intended to be used with insulation which is either -I r ⁇ relatively thick, has heat insulating characteristics , or is of a quality which is readily split.
• Figure 14 shows a further modification of the terminal of Figures 10 to 13 which includes an additional separate slotted blade portion 80 intended to be a further electrical interface with the conductor 78 forced therein .
• this embodiment is intended for especially thick insulations requiring substantial strength in the terminal .
• Figures 15 and 16 show a strip 79 of electrical terminals and a single terminal 81 , respectively, stamped and formed to include a terminating portion 82 having dual slotted plates for redundancy and suitable coated with solder 84 and front-end contact with spring fingers 86 intended to mate with conductive portions of like terminals .
• This terminal is of the type described in the previously mentioned U . S. Patent No. 4, 040 ,704.
• the terminating portion 82 includes slotted plates 88,90 which are turned at right angles to the insertion axis of the wire 92 which tends to load the spring elements of the slotted plates in torsion giving a different clamping or fixing action relative to stripping and fixturing of the conductor 94 of the wire 92.
• a region 98 of reduced metallic cross sectional area is formed wherein terminal locking spring elements 100 have been struck-out from the plane of the metal .
• This region can be controlled in width to sharply limit the transfer of heat from the region of the slotted plates 88 ,90 to the region of the spring fingers 86 to prevent annealing of the contact spring fingers .
• the bulk of the metal in the region of 98 need only be thick enough to be structurally adequate to hold the terminal together in use and , depending upon t ⁇ e thermal conductivity of the metal , adequate to carry current without excessive resistance.
• Figure 17 is a perspective view of a representative electrical connector 102 containing numerous terminals 104 terminating a like number of wires 106.
• Figure 18 shows the connector 102 proximate to a tool 108 which has ferrite magnetic pole pieces 110 , 112 shaped to concentrate an electromagnetic field in the region of termination of the connector terminals 104 to the • wires 106.
• tool 108 reference is made to U . S. Patent No. 4, 359 ,620 dated November 16, 1982 , to Joseph R. Keller which shows an induction heating apparatus having shaped ferrite pole pieces which focus or concentrate a field of high flux density .
• FIG. 19 shows a termination slot of a terminal 104 in section with conductor 106 in the slot and its insulation 1 14 split, as frequently happens with the PVC, polypropylene, or polyethylene insulation in wide use in industry .
• Figure 21 shows the resulting melt and pull back of insulation 1 14 before reflow of the solder coating on the terminal 104.
• Figure 22 shows the terminal 104 after reflow , with the insulation pulled away, and the solder joint formed .
• This insulation pull back happens best with eddy current heating where the heat comes from the terminal 104, rather than from an external source, such as with hot nitrogen , vapor phase, resistance or infrared heating which tend to "cook" from the outside surfaces rather than generate heat in the surfaces of the metal parts.
• Figure 18 also shows the connector 102 with wires terminated . Essentially no damage is done to the housing 101 if the application of heat is quick .
• With the abovementioned Keller induction heating system focused alternating electromagnetic field cycle times of a few seconds are possible. In general this time cycle is a function of the focus of field , the frequency of alternation and the properties of the material to be heated.
• the structures heretofore described and shown assure that four of the five critical .parameters for solder are "built in” .
• the right solder is factory applied in construction and manufacture of the terminal for prescribed types of wire and cable.
• the slot and action of conductor insertion operate to assure cleaning action.
• the slot and plate structure assures the right fixturing to hold things still and promotes the right pressure of parts for heat transfer.
• Figures 20 to 22 represent almost a classic case for effecting termination with the present invention .
• the insulation is cut only on both sides and may remain intact above and below the conductor as shown in Figures 19 and 20. This usually, but not always , will separate during the heating cycle.
• Any of a number of fluxes can be used with the present invention .
• a water soluble flux could be applied immediately before reflow. If it were also electrically nonconductive and noncorrosive, it could simply be washed away after reflow. It would also be possible to precoat the terminals with an oxidizing inhibitor which would act as a cleaning agent.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
• Coupling Device And Connection With Printed Circuit (AREA)
• Multi-Conductor Connections (AREA)
• Manufacturing Of Electrical Connectors (AREA)

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• 1985
  • 1985-09-13 JP JP60503991A patent/JPS62500621A/ja active Pending
  • 1985-09-13 DE DE8585904574T patent/DE3572425D1/de not_active Expired
  • 1985-09-13 WO PCT/US1985/001743 patent/WO1986002497A1/en active IP Right Grant
  • 1985-09-13 BR BR8506983A patent/BR8506983A/pt unknown
  • 1985-09-13 KR KR1019860700354A patent/KR880700479A/ko not_active Application Discontinuation
  • 1985-09-13 EP EP85904574A patent/EP0201512B1/de not_active Expired
  • 1985-09-20 IE IE2321/85A patent/IE56877B1/xx unknown
  • 1985-10-16 ES ES547905A patent/ES8703673A1/es not_active Expired
  • 1985-10-16 ES ES1985289644U patent/ES289644Y/es not_active Expired

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