Electrical connector for attachment in a panel opening

Abstract: A connector, particularly designed for attachment to an automobile door having an opening therein, including a hood passing through the opening when the device is installed. The hood carries, on one surface, a lock piece with an engagement projection and its distal end. Since the entire connector is molded of resin, contact with the perimeter of the opening in the door can scratch the sloped surface of the engagement projection and hinder its insertion. There is provided a metal cover fitting over a sloped surface of the lock piece so that, when the connector is inserted, there is only metal to metal contact between the perimeter of the opening and the cover of the slope surface. In this way, even if there is flash around the perimeter, the connector can be smoothly and readily attached.

Description: The present Invention is directed to a connector of synthetic resin designed for attachment to a panel, particularly a metal panel. More specifically, the present Invention is intended for use in connection with a door panel of an automobile. BACKGROUND OF THE INVENTION A prior art device of the general type to which the present Invention is directed is shown in Figures 7 and 8. Attachment connector 1 is provided with lower projection 5 and flange 4 adjacent thereto. Lower projection 5 is inserted through opening 9a in panel 9. Thereafter, connector 1 is pivoted about a point between flange 4 and lower projection 5 so that lock piece 3 and lock projection 3a are forced into opening 9a. Since lock piece 3 is flexible, the perimeter of hole 9a, bearing against lock projection 3a, forces it inwardly so that it can pass through hole 9a. Thereafter, its natural resilience allows it to spring outwardly so that the rear perpendicular face of lock projection 3a bears against the surface of panel 9, thereby locking connector 1 in place. However, there is a problem with this device. Specifically, as best shown in Figure 8, panel 9 will often have flash B adjacent the perimeter of opening 9A. If flash B is located other than at the points in the periphery where lower projection 5 and lock projection 3a are introduced, it presents no problem. However, if flash B is located adjacent the point of entry of lock projection 3a (as shown in Figure 8), difficulties in assembly can arise. It is possible to arrange the stamping of the panel so that any flash formed will project inwardly at a point on the perimeter where lock projection 3a and lower projection 5 are not located. However, this would present increased design restrictions on the various dies, molds, etc. used. This, coupled with the rapid turnover of automobile models, militates against following this course. There are simply too many other considerations of greater importance so that this solution is not feasible. EP-A-0 615 315 discloses a connector according to the preamble of claim 1. This connector, intended for attachment in an opening in the metal panel, is provided with a hood which faces the opening and may be inserted therein. A fitting projection is located on an outer face of the hood with a flange spaced apart therefrom by approximately the thickness of the panel. The fitting projection is inserted into the opening so that a portion of the perimeter is located between the fitting projection and the flange, thereby permitting the fitting projection to bear against the far side of the panel. Spaced apart from the fitting projection is a lock piece on the exterior of the hood which is intended for insertion into the opening in a manner similar to that of the fitting projection. The lock piece is provided with a sloped surface which slants inwardly in the insertion direction of the connector. In this prior art connector the lock piece may be made of either a resin material or a metal. In case of a resin material the aforementioned problems will arise, i.e. flash at the periphery of the opening may damage the lock piece and may interfere with assembly. If the lock piece is made of metal, it is less likely to be damaged by flash at the opening perimeter, but it needs to be securely and strongly fastened to the hood, which makes the manufacture of the connector more complicated and expensive. It is an object of the invention to overcome the foregoing problems and to provide a connector which can be easily attached even if a flash is present at a critical portion of the perimeter of the penel opening. This problem is solved according to the invention by a connector as defined in claim 1. In this connector, a metal cover is fitted onto the sloped surface and preferably locked thereon. The metal cover slides against the perimeter during insertion of the lock piece, whereby the pressure of the perimeter forces the lock piece to flex inwardly, thus permitting the lock projection to pass through the opening and spring outwardly thereafter, thereby locking the connector in place. Preferably, the lock piece and the lower projection are spaced diametrically opposite each other on the exterior surface of the hood. This provides maximum security for the connector. In a further refinement of the device, the engagement projection is provided with a front groove, which begins at the leading edge of the engagement projection and extends toward the rear thereof. There is an engagement piece on the cover, complementary to the front groove, which fits into the front groove when the cover is mounted on the sloped surface. In a preferred form of the connector, the cover also has at least one bent piece which depends from its rear edge, remote from the engagement piece. There is a complementary groove in the rear portion of the engagement projection which receives the bent piece when the cover is mounted. This locks the cover firmly on the sloped surface of the engagement projection. It has been found particularly desirable to provide two bent pieces, spaced apart transversely to the insertion direction of the connector. In this form of the Invention, there are two complementary grooves in the engagement projection. In some cases, flash is left in the opening projecting inwardly from the perimeter thereof. In such a case, contact between the metal flash and the sloped surface of the engagement projection (which is made of synthetic resin) causes scratching and resistance to entry. Thus, when the metal cover of the present Invention is provided on the sloping surface, it prevents abrasion of the engagement projection and provides a metal to metal sliding contact which reduces the friction substantially as compared to a metal to resin contact. In this way, the attachment of the connector to the panel is more reliable and easier. BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings, constituting a part hereof, and in which like reference characters indicate like parts, Figure 1 is a diagrammatic exploded perspective view of the connector of the present Invention; Figure 2 is a perspective view of the engagement projection and its metal cover, separated from each other; Figure 3 is a perspective view, similar to that of Figure 2, showing the cover on the engagement projection; Figure 4 is a cross-section of the panel and the hood before insertion into the opening; Figure 5 is a view, similar to that of Figure 4, wherein the hood is partially inserted into the panel; Figure 6 is an enlarged fragmentary cross-section showing the action of the present Invention when flash is present; Figure 7 is a view, similar to that of Figure 5, of the prior art connector; and Figure 8 is a view, similar to that of Figure 6, of the prior art connector of Figure 7. DETAILED DESCRIPTION OF THE INVENTION With reference to Figures 1 to 6, connector 10 comprises housing 11 and hood 12. Upper wall 12a of hood 12 carries lock piece 13 which terminates in engagement projection 14. Cover 15 fits over sloped surface 14a. Engagement projection 14 has perpendicular surface 14b, horizontal surface 14c, bottom surface 14d, and perpendicular end surface 14e. In bottom surface 14d is front groove 14d1. Complementary grooves 14b1 are adjacent each lateral end of perpendicular surface 14b. Cover 15 is provided with engagement piece 15a and bent pieces 15b. Insertion of connector 10 into opening P1 in panel P is best seen in Figures 4 to 6. Fitting projection 16 is first inserted through opening P1 so that the perimeter thereof fits between flange 17 and fitting projection 16. Hood 12 is then rotated about the portion of the perimeter of opening P1 adjacent flange 17 so that the opposite perimeter of opening P1 bears against metal cover 15 on sloped surface 14a, thereby causing lock piece 13 to flex inwardly. This is particularly shown in Figures 5 and 6. Due to the metal to metal contact between cover 15 and panel P, flashing B does not damage sloped surface 14a, nor does it cause any increased friction therebetween. In actuality, the sliding contact between cover 15 and flashing B is low friction and permits easy introduction of engagement projection 14 into opening P1 so that perpendicular surface 14B bears against panel P adjacent the perimeter thereof. It is, of course, possible to make lock piece 13 (and engagement projection 14) entirely from metal, thus eliminating the need for cover 15. Such a lock piece is not part of the present invention. However, connecting this metal part to the remainder of the connector (which is of resin) is extremely difficult. For example, if insert molding is to be used, the entire connector becomes larger and more expensive. In the present Invention, cover 15 is located only on engagement projection 14, and is easily snapped into place. Moreover, cover 15 itself is easily produced by simple bending of a metal plate. This retains the small size of the connector and keeps production costs low. While only a limited number of specific embodiments of the present Invention have been expressly disclosed, it is, nonetheless, to be broadly construed according to the claims.

Claims: A connector (10) of synthetic resin (for attachment in an opening (P1) in a panel (P), said opening having a perimeter, said panel having a near side, facing an insertion direction of said connector, and a far side, opposite said near side, a hood (12) on said connector facing said panel and substantially complementary to said opening, a fitting projection (16) of synthetic resin on an outer face of said hood and adapted for insertion into said opening in said insertion direction and bearing against said far side adjacent said perimeter after insertion, a lock piece (13) on an exterior of said hood spaced apart from said fitting projection, adapted for insertion into said opening from said near side, and bearing against said far side adjacent said perimeter after insertion, whereby said connector is secured to said panel, and a sloped surface (14a) on said lock piece slanting inwardly in said insertion direction, characterized by a metal cover (15) on said sloped surface (14a) and adapted to slide against said perimeter during insertion of said lock piece. The connector of Claim 1 wherein said lock piece (13) is on an opposite surface of said hood (12) from said fitting projection. The connector of Claim 1 wherein said engagement projection has a front groove (14D1) in a bottom surface (14d) thereof, commencing at a leading edge (14e) of said engagement projection and extending parallel to said direction away from said leading edge, an engagement piece (15a), complementary to said front groove, adapted for insertion into said front groove when said metal cover (15) is on said sloped surface. The connector of Claim 3 wherein said metal cover (15) has at least one bent piece (15b) depending from a rear edge thereof remote from said engagement piece, at least one complementary groove (14b1) in said engagement projection adapted to receive said bent piece when said cover is on said sloped surface. The connector of Claim 4 wherein there are two bent pieces (15b), spaced apart transversely to said insertion direction, and two complementary grooves (14b1) in said engagement projection (14). The connector of Claim 1 comprising a flange (17) on the outer face of said hood, (12) adjacent said fitting projection (16) and spaced apart therefrom in an upstream direction opposite said insertion direction, by approximately a thickness of said panel.

Inventors: ITO MITSURU, TOKUWA KOICHIRO, ITO, MITSURU, TOKUWA, KOICHIRO, Ito, Mitsuru, c/o Sumitomo Wiring Syst. Ltd., Tokuwa, Koichiro, c/o Sumitomo Wiring Syst. Ltd.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1997
Main classification: H01R13
IPC codes: H01R13