Electrical connector and alignment apparatus for contact pins thereof

Abstract: Alignment apparatus (10) for aligning contact pins (28,30,32) exiting an electrical connector comprises an elongate body of electrically insulative material having a generally flat base (12) defining a plurality of passages opening into respective upper (12a) and lower (12b) surfaces of the base portion, first projections (16,18) integral with the body and extending upwardly of the base upper surface, the first projections being disposed interiorly of longitudinally opposed end margins of the body, and second projections (20,22) integral with the body and extending upwardly of the base upper surface, the second projections being cantilever-supported by the base such that free ends of the second projections distal from the base upper surface may occupy positions variable longitudinally of the base. The first projections (16,18) provide for registration of the alignment apparatus with a connector and are adjacent longitudinally opposed margins of the apparatus. The second projections include latching structure (20b,20c,22b,22c) at the free ends thereof for mating with complemental latching structure of a connector.

Description: FIELD OF THE INVENTION This invention relates generally to electrical connectors and more particularly to contact pin alignment apparatus for electrical connectors. BACKGROUND OF THE INVENTION A requirement for contact pins of a wide variety of electrical connectors is a high degree of flexibility. For example, so-called "right angle headers" require _contact pins to have a ninety degree bend in order to interface a female output connector to a printed circuit board (PCB). Such contact pin flexibility gives rise, however, to difficulties in aligning the PCB connection ends of the contact pins with a pattern of PCB plated-through holes for connection of the header to traces on the PCB. The art has extensively addressed the difficulty with various forms of alignment apparatus securable either to a connector or to a PCB, such as are shown in U.S. Patent Nos. 3,651,444, 4,721,472 and No. 5,133,670. A quite wimple alignment apparatus is shown in IBM Technical Disclosure Bulletin , Vol. 31, No.5, October 1988, pp. 122-124, wherein alignment apparatus for mounting on a PCB comprises a flat, elongate electrically insulative body with a plurality of contact alignment passages therethrough and snap-in projections extending from the body undersurface to secure the same to a PCB. US-A-5104326 discloses a right angle connector with a pin tail aligner for aligning contact pins exiting the connector, the aligner having an elongate body of electrically insulative material having a generally flat base defining a plurality of passages opening into respective upper and lower surfaces of the base, the base having openings formed therein to accept portions of ground straps of the connector, and projections extending from the connector to engage a printed circuit board for holding the connector to a printed circuit board. US-A-5340320 discloses a safety shield for a header, the shield having a base, first projections extending upwardly from the base for engaging recesses in the header, and second projections extending upwardly from the base for latching with the header. SUMMARY OF THE INVENTION The present invention has as its primary object the provision of improved contact pin alignment apparatus. A particular object of the invention is to provide contact pin alignment apparatus for ready association with a connector to align contact pins as they exit the connector. In a preferred manner an electrical connector can be improved by embodying a contact pin alignment apparatus according to the invention. In attaining these and other objects, the invention provides alignment apparatus for aligning contact pins exiting an electrical connector, said alignment apparatus comprising an elongate body of electrically insulative material having a generally flat base defining a plurality of passages opening into respective upper and lower surfaces of said base, first projections integral with said body and extending upwardly of said base upper surface, said first projections being disposed interiorly of longitudinally opposed end margins of said body, and second projections integral with said body and extending upwardly of said base upper surface, said second projections being cantilever-supported by said base such that free ends of said second projections distal from said base upper surface may occupy positions, which positions are variably locatable longitudinally of said body. The first projections provide for registrations of the alignment apparatus with a connector and are preferably substantially immobile relative to the base. The second projections preferably include latching structure at the free ends thereof for mating with complemental latching structure of a connector. An electrical connector has in accordance with the alignment apparatus according to the invention a housing comprised of electrically insulative material and a plurality of contact pins extending from the housing through an exit channel for the housing, the housing having first and second portions bounding the housing channel and defining respective first and second recesses in an undersurface of the housing. The alignment apparatus is registered with the housing through residence of the first projections in the first and second housing recesses. The second projections of the alignment apparatus are resident in the housing channel and are respectively in engagement with the housing first and second portions. The forgoing and other objects and features of the invention will be further understood from the following detailed discussion of preferred practices and embodiments thereof and from the drawings wherein like reference numerals identify like components and parts throughout. BRIEF DESCRIPTION OF THE DRAWING FIGURES Figure 1 is a perspective view of alignment apparatus in accordance with the invention. Figure 2 is plan view of the Figure 1 apparatus. Figure 3 is side view of Figure 2. Figure 4 is a front view of a connector in accordance with the invention. Figure 5 is a sectional view of the Figure 4 connector as would be seen from plane V-V of Figure 4. Figure 6 is a plan view of the Figure 4 connector. Figure 7 is a rear view of the Figure 4 connector, broken away in part to show interior detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Figures 1-3, alignment apparatus 10 comprises an elongate body of electrically insulative material, such as molded plastic, having a generally flat base 12 defining a plurality of passages 14 opening into upper 12a and lower 12b surfaces of base 12. Lower surface 12b is centrally undercut in its expanse in registry with passages 14. First projections 16 and 18 are integral with base 12 extend upwardly of upper surface 12a. Projections 16 and 18 are disposed interiorly of longitudinally opposed end margins 12c and 12d of base 12 and are preferably of cylindrical configuration, as indicated in Figures 1 and 2. Nesting recesses are formed in undersurface of a connector with which apparatus 10 is used for receiving projections 16 and 18, such that apparatus 10 and the connector are properly positionally registered, i.e., connector contact pins are aligned with passages 14. Second projections 20 and 22 are also integral with base 12 and also extend upwardly of base upper surface 12a. Projections 20 and 22 are cantilever-supported by base 12, such that free ends 20a and 22a thereof distal from base upper surface 12a may occupy positions variable longitudinally of base 12. More particularly, the second projections have camming surfaces 20b and 22b at free ends 20a and 22a. As the camming surfaces engage connector surfaces, they displace free ends 20a and 22a increasingly toward one another as wedging action occurs as between camming surfaces 20b and 22b and the connector surfaces. Upon completion of the wedging action, detent ledges 20c and 22c engage connector interior surfaces as projections 20 and 22 return to their relaxed dispositions shown in Figure 1. First projections 16 and 18 have extent upwardly of base upper surface 12a less than extent of second projections 20 and 22 upwardly thereof and, unlike the latter, are substantially immobile relative to the base. The second projections are disposed longitudinally interiorly of the first projections. Turning to Figures 4-7, they show alignment apparatus 10 in retentive relation to connector 24. Connector 24 comprises an electrically insulative housing 26 having upper contact pin row 28, middle contact pin row 30 and lower contact pin row 32. AS is seen particularly in Figure 5, each contact pin row has contacts bent at ninety degrees, such that connector 24 can mate with another connector (not shown) having three horizontally disposed socket rows and interconnect the socket rows with a PCB (not shown). As is seen in Figures 5 and 6, the contact pins exit housing 26 through a rearward channel 24a opening bounded on opposite sides respectively by housing portions 26a and 26b. The interior surfaces of housing portions 26a and 26b are the connector surfaces for effecting the wedging action of projections 20 and 22, above discussed in connection with Figures 1-3. The upper surfaces of housing portions 26a and 26b are the connector surfaces above referred to as engaging detent ledges 20c and 22c, such retentive engagement being seen in Figure 7. At their undersurfaces, housing portions 26a and 26b define the above-discussed recesses for receiving projections 16 and 18, recess 26b-1 being shown with projection 18 in the broken away portion of Figure 7. Various changes to the particularly disclosed alignment apparatus and connector may evidently be introduced without departing from the invention as defined by the claims. Accordingly, it is to be appreciated that the particularly discussed and depicted preferred embodiments and practices of the invention are intended in an illustrative and not in a limiting sense.

Claims: Alignment apparatus (10) for aligning contact pins (28, 30, 32) exiting an electrical connector, said alignment apparatus comprising an elongate body of electrically insulative material having a generally flat base (12) defining a plurality of passages (14) opening into respective upper and lower surfaces (12a, 12b) of said base (12), first projections (16, 18) integral with said body and extending upwardly of said base upper surface (12a), said first projections (16, 18) being disposed interiorly of longitudinally opposed end margins (12c, 12d) of said body, and second projections (20, 22) integral with said body and extending upwardly of said base upper surface (12a), said second projections (20, 22) being cantilever-supported by said base (12) such that free ends (20a, 22a) of said second projections (20, 22) distal from said base upper surface (12a) may occupy positions, which positions are variably locatable longitudinally of said body. The apparatus claimed in claim 1, wherein said second projections (20, 22) define latching structure at said free ends (20a, 22a) thereof. The apparatus claimed in claim 1 or claim 2, wherein said first projections (16, 18) extend upwardly from said base (12) less than said second projections (20, 22) extend upwardly from said base (12). The apparatus claimed in any one of claims 1 to 3, wherein said first projections (16, 18) are substantially immobile relative to said base (12). The apparatus claimed in any one of claims 1 to 4, wherein said second projections (20, 22) are disposed longitudinally interiorly of said first projections (16, 18).

Inventors: HENDERSON KEVIN G, SCRUGGS CRAIG S, HENDERSON, KEVIN G., SCRUGGS, CRAIG S.
Applicants: THOMAS & BETTS CORP, THOMAS & BETTS CORPORATION (A TENNESSEE CORPORATION)
Application year: 1995
Main classification: H01R12
IPC codes: H01R12, H05K3, H01R13