Patent Application
20160359251
The invention relates to a connector configured to be coupled with a pin header connector and to pin receiving contacts for such a connector. The invention also relates to a method of manufacturing such contacts.
Such cable connectors are for instance used in automotive applications, e.g., for cooperation with an on-board pin header connector on a printed circuit board or a similar substrate. Such connectors are typically provided with pin receiving contacts comprising contact beams resiliently engaging an inserted contact pin of a complementary pin header connector. The contact between the contact beams and an inserted contact pin should be sufficient to conduct required amounts of current. The contact should also be reliable, particularly when it is exposed to vibrational loads, as may occur in automotive practice. Contact between the terminal contact and an inserted contact beam can be improved by using more contact points.
Contact pins are usually provided with a coating of gold or another precious metal on the contact face. Since gold does not oxidize, a gold coating helps to improve electro-conductive contact between the pin and the terminal contact. It also helps to reduce friction between the contact pin and the terminal contact during insertion of the pin. Increase of the number of contact points would increase the required gold consumption and the manufacturing costs of the terminal contact.
It is an object of the invention to provide a cable connector which can be manufactured economically and which provides good and reliable contact with an inserted contact pin.
To this end, a connector is disclosed with one or more pin receiving terminal contacts with a base comprising a folded strip. The terminal contact has at least a first contact beam having a root end extending from the base and a contact face bent sideward under an angle with said root end.
The base can for example be rectangular, square, polygonal or circular, C-shaped or U-shaped, when viewed in a pin insertion direction, e.g. folded over at least two folding lines substantially parallel to a pin insertion direction. This way, it can support a plurality of parallel contact beams at different sides of the terminal contact. It may form a pin receiving opening forming a passage of a contact pin of a mating counterconnector or it may be an opening in line with a pin insertion direction. If the contact beams extend in a direction coinciding with the pin insertion direction, the base will typically be a pin receiving opening. In case the contact beams extend in the opposite direction, the base is not necessarily a pin receiving opening.
In a specific embodiment, the terminal contact provides at least one pair of contact points at one or more sides. The contact points of a pair at one side of the terminal contact can be positioned on different contact beams. Having two contact points on different contact beams at the same side of the terminal contact enables to provide a reliable contact which is less sensitive for vibrational loads and which requires less gold consumption.
To balance contact forces, the terminal contact may for instance comprise at least two pairs of contact points at opposite sides of the terminal contact.
The contact points of a pair may for example be positioned on contact beams resiliently flexed in different bending directions. For instance, a first contact beam can be flexed towards the center of the pin receiving space, while the second contact beam comprises a contact point on a sideward bent flange or flag. This results in different vibrational behaviour, so the vibration resistance of the contact as a whole is increased.
In a specific embodiment, the terminal contact of may have a first contact beam extending from a first side of the base, and a second contact beam extending from an adjacent second side of the base, the contact face of the first contact beam being bent sideward to be in line with said second contact beam. In a more specific embodiment, the terminal contact may comprise a third contact beam facing the first contact beam and extending from a third side of the base, and a fourth beam facing the second contact beam and extending from an adjacent fourth side of the base. The third contact beam may comprise a contact face bent sideward to be in line with said fourth contact beam.
Optionally, the pin receiving space is four-sided in cross section, two opposite sides being defined by the longer contact beams while the other two sides are defined by the shorter contact beams. The tips of the longer contact beams may for example comprise flanges forming rear contact faces, the flanges being folded to be in line with the shorter contact beams. In that case each pair of contact points or contact areas includes one front contact area provided by a resiliently biased tip of a forwardly flexed shorter contact beam while the rear contact area is provided by the inwardly bent flange at the tip of the longer contact beam.
The line through the contact points or areas at the same side of the terminal contact can be parallel to the pin insertion direction, or it can make an angle with the pin insertion direction. In the last case, when a contact pin is inserted into the pin receiving space, one contact point will wipe and slide over the left hand side of the contact pin, while the other contact point will wipe and slide over the right hand side of the contact pin. As a result the contact points produce separate wear tracks on the contact pin, so the extent of wear per wear track is less. This enhances durability and the maximum number of possible mating cycles.
The shorter and longer contact beams may for example extend from a base defining a pin receiving opening. The contact beams can extend rearwardly from the base, so the contact pin will first pass the base before being contacted to the contact points. Alternatively, the contact beams can extend forwardly from the base, so the contact pin will first be contacted to the contact points before it passes the base.
Optionally, the terminal contact may comprise a backbone with a connection end projecting from the contact beams, e.g., for connection to a cable end or a printed circuit board or a similar substrate. Such a connection end of the backbone may for example be provided with a crimp connection for attachment to a cable. Other types of cable attachments or printed circuit board connections, such as solder tail (surface mount (SMT) or pin-through-hole (PTH)) or press-fit connections, can also be used, if so desired.
The backbone connects the cable connection end to the base. In case the terminal contact comprises two or more bases, it connects the cable connection to a rear base closest to the cable connection end, and optionally also to the further base, e.g., between the contact beams.
A midsection of the backbone connecting the crimp connection section with the contact beam section, can for example be rigid or it can be made flexible. A flexible mid-section helps to reduce transfer of vibrational loads from the cable connection end to the pin receiving end of the terminal contact.
Optionally, the backbone may overlap one of the contact beams. For instance, the base can be folded in such a way that side of the base carrying said contact beam overlaps the side of the base connected to the backbone. These overlapping end parts of the base can for example be welded, soldered or glued.
In a further possible embodiment of the connector the terminal contact may for example comprise a front base, a rear base and one or more beams having:
The beams can be contact beams or merely supporting beams. More specifically, the beams may include a first and second beam being oppositely arranged. The terminal contact may further comprise oppositely arranged third and fourth beams between the first and second beams, both having a root end connected to a side of the front or rear base. For instance, the third and fourth beams may have a root end connected to the front base, a free end extending between the rear sections of the first and second beams and a mid-section bridging the root end and the free end.
In a further embodiment, the connector may comprise a terminal contact comprising at least one contact beam having a root end extending from the base and a contact face bent sideward along a folding line making an acute angle with a pin insertion direction.
A further possible embodiment may comprise a beam, such as a contact beam, extending from one side of the base pre-loading a contact beam extending from an adjacent side of the base. This makes it possible to increase the resilient contact force exerted by the pre-loaded contact beam to a mating contact pin.
Optionally, the connector may comprises a terminal contact with one or more support beams, each backing the contact area of an associated contact beam. The support beam contributes to the normal force exerted by the contact beam to a mating contact pin.
The longer contact beams can be equally dimensioned. Alternatively, they can be configured such that they have a different vibrational behaviour, e.g., with a different stiffness or length. Optionally, the contact areas or contact points of the longer contact beams can be staggered relative to each other, so that contact areas at different sides of the terminal contact are at different distances from the base. Similarly, the shorter contact beams can be configured such that they have a different vibrational behaviour, e.g., with a different stiffness or length or with staggered contact points. These measures help to improve resistance against vibrational loads.
Optionally, one or more contact areas are formed by bulging contact bumps or domes. For instance, the contact terminal may comprise one or more sides with contact areas on different contact beams, at least one of the contact areas on a side being formed by a dome. If a side of the contact terminal has two contact areas of different contact beams, both may be shaped as domes or one of the contact areas may be a dome, while the other is differently shaped, e.g., having a flat contact face or a bent tip. For example, if the first contact area at one side of the terminal contact is formed by a sideward bent flange of a longer contact beam, while the second contact area is formed by a shorter contact beam, the first contact area may be dome shaped, while the second contact area may also be dome shaped or not dome shaped. In such a configuration, the normal force exerted by the first contact area will typically be higher. Notwithstanding the higher normal force, pressure differences between the two contact areas can be reduced by adjusting the surface area of the one of the contact areas, e.g., by adjusting the shape, width, length or curvature of the dome shape.
The invention also relates to the terminal contact as such, which may for instance be folded from a single stamped part of sheet metal.
To manufacture such a contact, a process can be used, comprising the steps of:
The blank may for example comprise two longer contact beams, a first shorter contact beam between the two longer beams and a second shorter contact beam at a second end of the base strip.
Optionally, the two longer contact beams are provided with sidewardly extending flanges pointing away from the backbone, wherein the flanges are first bent upwardly before folding the base strip.
To allow easier handling of a large number of blanks, a series of blanks can be attached to a transport strip during folding.
Exemplary embodiments of the connector and the terminal contacts will be further explained with reference to the accompanying drawings.
The tips of the longer contact beams 3, 5 have flanges 11, 12 forming the rear contact points at the inner face of the pin receiving space 7. The flanges 11, 12 have been folded to be in line with the shorter contact beams 4, 6. When a contact pin (not shown) is inserted into the pin receiving space 7, it will first be contacted with the front contact points formed by the tips 8, 9 of the shorter beams and subsequently by the rear contact points formed by the inner faces of flanges 11, 12. The rear contact point formed by the flange 11 is paired and in line with the front contact point formed by the tip end 9 of the shorter contact beam 4 at the same side of the pin receiving space 7. Similarly, the rear contact point formed by the flange 12 is paired and in line with the front contact point formed by the tip end 8 of the shorter contact beam 6 at the same side of the pin receiving space 7.
Due to the different bending directions the front contact points formed by the tips 8, 9 of the shorter contact beams 4, 6 have a different vibrational behaviour than the rear contact points formed by the inwardly bent flanges 11, 12. This improves the overall resistance of the terminal contact 1 against vibrational loads.
The parallel contact beams 3, 4, 5, 6 extend from a base 13, formed by a strip folded to form a square or rectangular ring defining the entrance of the pin receiving space 7. A first folding line L is positioned between the backbone 14 and the contact beams 3, 4, 5, 6 and runs substantially parallel to the contact beams 3, 4, 5, 6 and the backbone 14. Folding the base strip 13 along this folding line L results in a geometry with the contact beams 3, 4, 5, 6 extending in substantially the same direction as the backbone without being coplanar with the backbone 14.
The terminal contact 1 further comprises a backbone 14, extending from the base 13 in a direction parallel to the contact beams 3, 4, 5, 6. In the shown embodiment, the backbone 14 and the contact beams 3, 4, 5, 6 extend rearwardly. This means that a contact pin must first pas the base 13 before it contacts the contact points of the contact beams 3, 4, 5, 6. In an alternative embodiment, the contact beams 3, 4, 5, 6 may extend forwardly with or without a backbone being present, so a contact pin will first contact the longer contact beams 4, 6 and subsequently the shorter contact beams 3, 5.
The contact beams, extending forwardly or rearwardly, may be folded such that a contact beam pre-loads two adjacent, oppositely arranged contact beams by resiliently forcing them apart before insertion of a contact pin. This will result in a higher contact force of the pre-loaded contact beams after insertion of a contact pin.
The backbone 14 has one end opposite to the base 13 provided with a crimp connection 16 allowing electrical and mechanical connection to a terminal end of a cable (not shown). The crimp connection 16 forms a cable connection end and projects from the contact beams 3, 4, 5, 6.
Between the crimp connection 16 and the contact beams 3, 4, 5, 6 the terminal contact 1 is provided with two upwardly folded flanges 18, 19 forming key-coding flags for correctly positioning the terminal contact 1 in a housing of a connector.
Optionally, the contact terminal can be designed for being side loaded into a connector housing or housing part. To that end, the contact can be provided with appropriate flags and/or guiding surfaces. Also the crimp connection, if present, can be designed for being used to position, press fit and or retain the contact into a matching cavity in the housing or housing part.
Similarly, the two longer contact beams 3, 5 have a straight longitudinal side edge 23 and an oblique longitudinal side edge 24 making an angle of about 5 degrees with the straight side edge 23. However, the top half 25 of the straight edges 23 is slightly offset to the lower half 26 of the straight edge 23 with a oblique mid-section 27 bridging the straight upper and lower halves 25, 26. The top ends of the longer contact beams 3, 5 are provided with the sidewardly extending flanges 11, 12, both pointing away from the backbone 14. The two flanges 11, 12 are provided with imprinted convex contact faces 28, 29.
During manufacture the blanks 20 can be attached to a transportation strip 2, as shown in
All folding lines extend in a direction substantially parallel to the longitudinal length of the contact beams.
When the terminal contact 1 is folded, the front contact point on the tip end 8 of the outer shorter beam 6 is in line with the convex rear contact point 28 of the flag 12 of the adjacent longer contact beam 5. The paired contact points 8, 28 are at the same side of the pin receiving space 7 and contact a same side of an inserted contact pin.
Similarly, the front contact point on the tip end 9 of the other shorter beam 4 is in line with the convex rear contact point 29 of the flag 11 of the longer contact beam 3 next to the backbone 14. The paired contact points 9, 29 are at the same side of the pin receiving space 7 and contact a same side of an inserted contact pin.
In the embodiment of
In
At a cable connection side 92 the terminal contact 80 comprises a rear base 93 with a four-sided cross section. The two opposite longer contact beams 81, 82 extend between the front base 88 and the rear base 93 and have a front section 94, 95 extending from a side of the front base 88, a rear section 97, 98 extending from a side of the second base 93, and a midsection 99, 100 connecting the rear and front sections. The front and rear sections of the longer contact beams 81, 82 have parallel longitudinal directions but extend in different planes defining different adjacent sides of the terminal contact 80.
A first short contact beam 83 extends from the front base 88 between the two longer contact beams 81, 82. The short contact beam 83 has a root end 102, a contact end 103 and a midsection 104 connecting the root end 102 to the contact end 103. The root end 102 is connected to the front base 88 and extends between the front sections 94, 95 of the two adjacent longer contact beams 81, 82 in the direction of the rear base 93. The contact end 103 extends between the rear sections 97, 98 of the two longer contact beams 81, 82 and is folded sideward along a folding line parallel to the pin insertion direction over a 90 degrees angle with the root end 102. The contact end 103 has an inwardly bent tip 106 forming a contact face for an inserted contact pin.
The second contact beam 84 extends from an outer end of the first base 88 and also has a root end 107, a contact end 108 and a midsection 109 connecting the root end 107 to the contact end 108 in a similar arrangement. The contact end 108 of the second contact beam is folded over a 90 degrees angle with the root end 107 and partly overlaps the front section 94 of the longer contact beam 81 extending from the opposite side of the front base 88. The contact end 108 has an inwardly bent tip 111 forming a contact face for an inserted contact pin.
The front sections of both longer contact beams 81, 82 are provided with an inwardly bulging surface 112, 113 at different distances from the front base 88.
The front base 88 and the rear base 93 are both provided with a flag 114, 115 comprising a recess 116, 117 for receiving a projection 118, 119 at the opposite side of the respective base 88, 93.
As is particularly shown in
The foregoing description is provided for the purpose of explanation and is not to be construed as limiting the invention. While various embodiments have been described with reference to preferred embodiments or preferred methods, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Furthermore, although the embodiments have been described herein with reference to particular structure, methods, and embodiments, the invention is not intended to be limited to the particulars disclosed herein. For instance, it should be appreciated that structure and methods described in association with one embodiment are equally applicable to all other embodiments described herein unless otherwise indicated. Those skilled in the relevant art, having the benefit of the teachings of this specification, may effect numerous modifications to the invention as described herein, and changes may be made without departing from the spirit and scope of the invention, for instance as set forth by the appended claims.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2013/075350 | 12/3/2013 | WO | 00 |
