Abstract:
An orientation less squib connector for an automotive air bag assembly is disclosed. The squib connector includes a connector configured to fit within a squib socket. A connector position assurance member (CPA) is mounted on the connector body for movement between an open position and a closed position. The CPA includes an abutment member positioned to abut against a portion of the connector body to prevent movement of the connector position assurance member out of the open position. The CPA also includes a flexural member configured to abut against the socket to deflect the flexural member and the abutment member out of abutment with the portion of the connector body, whereby the connector position assurance member is movable to the closed position to prevent removal of the connector from the socket.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 60/067,538, filed on Dec. 4, 1997, entitled Orientationless Squib Connector, the disclosure of which is incorporated by reference herein. 
     This application is related to U.S. patent application Ser. No. 08/908,066, filed on Aug. 11, 1997, now U.S. Pat. No. 5,993,230, entitled “Orientationless Squib Connector Assembly for Automotive Air Bag Assemblies,” the disclosure of which is incorporated by reference herein. 
    
    
     STATEMENT OF FEDERALLY SPONSORED RESEARCH OF DEVELOPMENT 
     N/A 
     BACKGROUND OF THE INVENTION 
     Supplemental inflatable restraints or air bag assemblies are becoming increasingly common as a safety device in vehicles throughout the world. The assembly comprises an inflatable canister located in the steering column, the passenger-side dashboard, the side door panel, or seat. Upon a sufficiently great deceleration, the canister is inflated by an explosive device known as a squib which contains a gun powder-based material. The squib is fired electronically upon a signal sent via wires from a deceleration or other sensor in the vehicle. The wires are attached to the squib via a squib connector which plugs into the squib socket. 
     A common form of squib assembly has two pins which extend within the socket, and an associated connector has two terminals which are in electrical contact with the pins when the connector is plugged into the socket. When the connector is removed from the socket, typically for servicing the inflation canister, a shorting clip or shunt is biassed into electrical contact with the two pins to form an electrical connection therebetween to reduce the risk of misfiring, for example, by static electricity. The connector urges the shorting clip out of electrical contact with the pins when the connector is plugged into the socket. 
     During manufacture of a two-pin squib assembly, two rotational orientation concerns must be addressed. The pins must located at the correct clocking position relative to the connector and the squib. Also, the pins must be parallel to each other and perpendicular to the socket floor, or the entire assembly must be discarded. Also, during assembly of the vehicle, the vehicle manufacturer must be concerned about routing of the wires. A keying feature must be provided to ensure proper orientation of the assembly. 
     Other prior art air bag connectors are shown in U.S. Pat. Nos. 5,334,025 and 5,401,180. 
     SUMMARY OF THE INVENTION 
     The present invention provides a single-pin squib connector assembly which has no required rotational orientation. An orientationless squib connector for an automotive air bag assembly comprises a connector body having a cylindrical portion, defining a central axis, configured to fit in mating engagement within a squib socket. A first electrically conductive terminal is symmetrically located about the central axis within the cylindrical portion. A second electrically conductive terminal is radially offset from the electrically conductive terminal with respect to the central axis and comprises a depending beam having a contacting surface at a free end thereof. A cover is fixed to the connector body. 
     A connector position assurance member (CPA) is mounted on the connector body for movement between an open position and a closed position. The CPA includes an abutment member positioned to abut against a portion of the connector body to prevent movement of the connector position assurance member out of the open position. The CPA also includes a flexural member configured to abut against the socket to deflect the flexural member and the abutment member out of abutment with the portion of the connector body, whereby the connector position assurance member is movable to the closed position. 
     The connector body includes one or more latching arms having a catch thereon which fits within a groove on the socket. In one embodiment, the groove is located externally of the socket. In another embodiment the groove is located internally in the socket. To remove the connector from the socket, the latching arm is flexed to move the catch out of the groove. In the closed position, the CPA includes one or more depending arms that fit between the latching arm or arms and the rest of the connector body, preventing flexure of the latching arms and removal of the connector from the socket. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which: 
     FIG. 1 is an isometric view of a first embodiment of an orientationless squib connector according to the present invention with the connector position assurance member (CPA) disengaged and the cover removed, for use with a socket having an external groove; 
     FIG. 2 is a partial isometric bottom view of the connector of FIG. 1; 
     FIG. 3 is an isometric view of the connector of FIG. 1 with the CPA engaged; 
     FIG. 4 is a bottom isometric view of the connector of FIG. 3; 
     FIG. 5 is an isometric view of the cover of the connector of FIG. 1; 
     FIG. 6 is an isometric view of the connector body of the connector of FIG. 1; 
     FIG. 7 is a bottom isometric view of the connector body of FIG. 6; 
     FIG. 8 is an isometric view of the CPA of the connector of FIG. 1; 
     FIG. 9 is a bottom isometric view of the CPA of FIG. 8; 
     FIG. 10 is a top view of the connector of FIG. 1 with the cover attached; 
     FIG. 11 is a side view of the connector of FIG. 10; 
     FIG. 12 is a bottom view of the connector of FIG. 10; 
     FIG. 13 is a top view of the connector of FIG. 1 with the cover omitted and the CPA disengaged; 
     FIG. 14 is a sectional view along line  14 — 14  of FIG. 10; 
     FIG. 15 is a sectional view along line  15 — 15  of FIG. 11; 
     FIG. 16 is a sectional view along line  16 — 16  of FIG. 13 with the CPA disengaged; 
     FIG. 17 is a sectional view along line  16 — 16  of FIG. 13 with the CPA engaged; 
     FIG. 18 is a sectional view along line  18 — 18  of FIG. 12 with the lockout beam deflected by the top edge of the socket (not shown); 
     FIG. 19 is a sectional view along line  19 — 19  in which the lockout beam is not deflected; 
     FIG. 20 is an isometric view of a second embodiment of an orientationless connector for use with a socket having an internal groove; 
     FIG. 21 is a side view of the connector of FIG. 20; 
     FIG. 22 is an opposite side view of the connector of FIG. 20; 
     FIG. 23 is a top plan view of the body of the connector of FIG. 20; 
     FIG. 24 is a bottom plan view of the body of FIG. 23; 
     FIG. 25 is an isometric view of a cover for the connector of FIG. 20; 
     FIG. 26 is an isometric view of a connector position assurance member (CPA) of the connector of FIG. 20; 
     FIG. 27 is an isometric view of the body of the connector of FIG. 20; 
     FIG. 28 is a bottom isometric view of the body of the connector of FIG. 27; 
     FIG. 29 is a side view of the connector of FIG. 20; 
     FIG. 30 is a top plan view of the connector of FIG. 20; 
     FIG. 31 is a cross-sectional view along line  31 — 31  of FIG. 30; 
     FIG. 32 is a cross-sectional view along line  32 — 32  of FIG. 30; 
     FIG. 33 is a cross-sectional view along line  33 — 33  of FIG. 30; 
     FIG. 34 is a cross-sectional view along line  34 — 34  of FIG. 29; 
     FIG. 35 is a cross-sectional view along line  35 — 35  of FIG. 29; 
     FIG. 36 is a cross-sectional view along line  36 — 36  of FIG. 37; 
     FIG. 37 is a partial cross-sectional view along line  37 — 37  of FIG. 30 showing the connector disengaged; 
     FIG. 38 is a cross-sectional view along line  38 — 38  of FIG. 39; 
     FIG. 39 is a partial cross-sectional view along line  37 — 37  of FIG. 30 showing deflection to allow the CPA to engage in the closed position; 
     FIG. 40 is a cross-sectional view along line  40 — 40  of FIG. 41; 
     FIG. 41 is a cross-sectional view along line  37 — 37  of FIG. 30 showing the connector and CPA engaged; 
     FIG. 42 is an isometric view of the female terminal of the connector of FIG. 20; 
     FIG. 43 is an isometric view of the ground terminal of the connector of FIG. 20 prior to bending of the contacting ring into position; 
     FIG. 44 is a side view of a grounding clip; 
     FIG. 45 is an isometric view of a connector and socket assembly; and 
     FIG. 46 is an isometric view of a squib socket assembly. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention provides a single-pin squib connector assembly which has no required rotational orientation. 
     In a first embodiment, illustrated in FIGS. 1 through 19, a connector  10  is provided for use with a single-pin squib assembly having an external latching groove around the cylindrical socket which receives the connector. In the socket, shown for example in U.S. Pat. No. 5,993,230, a first terminal is provided by a single axial pin extending along the central axis of the cylindrical socket and anchored to the initiator cup of the squib. A second terminal comprising a flat, radially extending ground plate annularly surrounds the pin and is fixed to the initiator cup within the socket. An external annular groove is provided around the socket, to which the connector attaches as described further below. 
     The connector includes a first or female terminal  12  comprising a pair of opposed beams which contact the pin in the socket when the connector is inserted into the socket. The connector also includes a second or ground terminal  14  having a depending beam radially offset from the pair of beams contacting the pin. A contacting ring  18  is formed at the end of the depending beam to surround the female terminal and the central pin in the socket. The contacting ring is able to contact the ground plate at  5  any rotational orientation with respect to the socket. The terminals include wire crimp sections  60 ,  62  which grip associated wires  64 ,  66  entering the connector. 
     The connector includes a connector body or housing  20 , a cover  22 , and a connector position assurance member or CPA  24 . The wire crimp portions of the first and second terminals and the associated entering wires are sandwiched between the body and the cover. The cover attaches to the connector body in any suitable manner to prevent subsequent removal of the cover, such as with tabs  23 . 
     The CPA  24  is slidable between an open position (FIGS. 1,  2 ,  13 ,  16 ,  19 ) and a closed position (FIGS. 3,  4 ,  10 ,  12 ,  15 ,  17 ,  18 ). 
     A latching arm  26  extends from the connector body  20 . A catch  27  on the end of the latching arm latches to the external groove in the socket. When the connector is engaged in the socket, the CPA  24  is slidable to the closed position between the latching arm  26  and the rest of the connector body. In this position, the CPA ensures correct positioning of the connector in the socket and blocks flexure of the latching arm to disengage the catch  27  of the latching arm from the groove, so that the connector assembly cannot be removed from the socket. To remove the connector assembly, the CPA is pulled outwardly to disengage from the housing and unblock the latching arm. The latching arm is attached to the connector body with radial members  29  which flex and are configured to minimize stress on the connector body. 
     The female terminal includes a pad area  31  (see FIGS. 16 and 17) and the ground terminal includes a flexural beam  30  biassed to contact the pad area on the female terminal when the CPA  24  is not fully engaged in the closed position in the connector body. The CPA includes an arm or wedge  32  which pushes the flexural beam  30  away from the pad area  31  when the CPA is in the closed position in the connector body. In this way, when the CPA is in the open position, the terminals  12  and  14  are shorted by electrical contact between the flexural beam  30  and the pad area  31 . Thus, electronic diagnostic testing can be performed during assembly to determine if a short circuit exists, rather than relying upon a visual inspection to see if the CPA is fully engaged in the closed position. 
     In this embodiment, the CPA also includes an arm or abutment member  34  which abuts against an end of a lockout beam or portion  36  on the connector body when the connector is not inserted into a squib socket, preventing the CPA from being pushed into the closed position with respect to the connector. When the connector body is inserted into the squib socket, the top edge of the socket contacts the lockout beam  36 , pushing it up and out of abutment with the arm on the CPA. Once the lockout beam no longer abuts against the CPA, the CPA can be pushed into the closed position in the connector body. 
     The CPA includes another arm  38  which fits between the upwardly extending portion  39  of the latching arm  26  of the connector body, preventing the upwardly extending portion from being pivoted toward the wire entrance area  41  to unlatch the latching arm  26 . In this manner, the CPA in the closed position prevents the connector body from being removed from the socket. Also, the CPA includes a pair of sliders  44 ,  46  which slide within a slot area  48  within the connector body  20 . Protrusions  50 ,  52  on the sliders abut against faces on the connector body to limit travel of the CPA between the open and closed positions and prevent the CPA, once installed, from being fully removed from the cover. 
     A further embodiment of an orientationless single-pin squib connector assembly for use with a single-pin socket having an internal annular latching groove is illustrated in FIGS. 20 through 46. The connector assembly includes a connector  110  having a depending cylindrical portion  112  for insertion within the socket  114  (see FIGS.  45  and  46 ). In the socket, a first terminal  116  is provided by a single axial pin  117  extending along the central axis of the cylindrical socket and anchored to the initiator cup of the squib. A second terminal  118  comprising a grounding clip annularly surrounds the pin and is fixed to the initiator cup within the socket. When the connector is not inserted into the socket, the grounding clip is biassed upwardly such that it makes electrical connection with the axial pin. When the connector is inserted into the socket, it pushes the grounding clip out of electrical contact with the axial pin. An annular groove  120  is provided internally within the socket to which the connector  110  latches, described further below. 
     The connector includes a first or female terminal  122  comprising a pair of opposed beams  124  which contact the pin  117  in the socket  114  when the connector is inserted into the socket. The connector also includes a second or ground terminal  126  having a depending beam radially offset from the pair of beams contacting the pin. A contacting ring  127  is formed at the end of the depending beam and bent from the position shown in FIG. 43 to surround the female terminal and the central pin in the socket. The contacting ring is able to contact the grounding clip  118  at any rotational orientation with respect to the socket. The terminals include wire crimp sections  128 ,  130  which grip associated wires  132 ,  134  entering the connector. 
     The connector includes a connector body or housing  136 , a cover  138 , and a connector position assurance member or CPA  140 . The wire crimp portions  128 ,  130  of the first and second terminals and the associated entering wires  132 ,  134  are sandwiched between the body  136  and the cover  138 . The cover attaches to the body in any suitable manner to prevent subsequent removal of the cover, such as by apertures  142  which receive tabs  144  on the body. A ferrite bead  146 , as is known in the art, surrounds the wires  132 ,  134  in a suitably sized recess in the connector body  136 . 
     Two latching arms  150 ,  152  extend from the connector body  136 . Catches  170 ,  172  protrude from the latching arms to latch to the internal groove  120  in the socket. The latching arms are attached to the connector body with flexure members  153 ,  155  which flex to allow the upper portions  157  of the latching arms to be moved or flexed inwardly toward the center of the connector. When the upper portions are so flexed inwardly, the catches are displaced out of the groove and the connector can then be removed from the socket. 
     The CPA  140  is slidable between an open position (FIG. 37) and a closed position (FIG. 41) and is retained on the housing by catches  181  (FIG.  24 ). When the connector has been engaged in the socket, the CPA  140  is slid toward the wire entrance area  159  into the closed position, in which depending arms  158  fit between the latching arms  150 ,  152  and the rest of the connector body. In this position, the CPA ensures correct positioning of the connector in the socket, and the depending arms  158  of the CPA block removal of the latching arms  150 ,  152  from the groove  120 , so that the connector cannot be removed from the socket. To remove the connector, the CPA is slid in a direction away from the wire entrance area  159  to unblock the latching arms, whereupon the latching arms can be flexed inwardly to disengage the catches  170 ,  172  from the groove  120 . 
     The CPA  140  also includes one or more catches or abutment member  154  depending from an underside of the CPA. See FIG.  37 . The catches  154  fit within corresponding first notches or lockout portions  156  on the cover  138  of the connector body  136  when the connector is not inserted into a squib socket, preventing the CPA from being pushed into the closed position with respect to the connector. Full closure of the CPA is prevented when arms  150  and  152  are only partially mated since the arms interfere with arms  158 . When the connector body is inserted into the squib socket, the top edge of the socket contacts the two depending arms  158  of the CPA  140 , pushing the arms  158  upwardly and thereby displacing the catches  154  out of the first notches  156  on the cover. Once the catches no longer fit within the first notches, the CPA can be slid toward the wire entrance area  159  into the closed position in the connector body. In the closed position, the catches  154  fit within corresponding second notches  190  on the cover  138 , to retain the CPA in the closed position. 
     The CPA  140  optionally includes a central beam  180  having a downwardly extending protrusion  182  on the end. See FIGS. 30 and 32. The protrusion fits within one of two corresponding depressions or apertures  184 ,  186  in the cover  138 , depending on whether the CPA is in the open or closed position. The protrusion  182  limits travel of the CPA between the open and closed positions and provides an audible click as it enters the depressions  184 ,  186 , so that a user can detect when the CPA has been fully moved into either the closed or open position. 
     The invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims.