L-shaped bulb connector

Abstract: A spring contact (26), biased toward a retaining plate (25), holds the connection terminal (30) in good electrical contact. The resilience of the spring contact permits relative movement between the contacts, thereby accommodating dimensional changes resulting from variations in ambient temperatures. The spring contact may be on the bulb terminal (20) or on the connector terminal. An engaging element (32) is provided on the leading end (31) of the connection terminal; this element engages a retainer (28) on the bulb terminal to further secure the components in their desired position.

Description: The present Invention is directed to an improved bulb connector wherein the bulb socket and connector socket are at right angles to each other. More specifically, the Invention is intended to minimize or eliminate the strains which can be imparted to the components of the connector as a result of variations in the ambient temperature to which the connector is subjected. BACKGROUND OF THE INVENTION A typical prior art device is depicted in Figures 11 and 12. Main housing 1 comprises bulb socket 2 and connector socket 3 at right angles to each other. Connector terminal 4 is located within connector socket 3 and is adapted to be electrically connected to power supply connection B. Bulb terminal 5 is located in bulb socket 2 and is adapted to receive the contact portion of bulb A. To assemble the device, connector terminal 4 is inserted into housing 1 in the horizontal direction as shown in Figure 11. Correspondingly, bulb terminal 5 is inserted into bulb socket 2 in a vertical direction as shown in Figure 11. Fitting hole 4B is formed in leading end 4A of connector terminal 4 and insertion end 5A of bulb terminal 5 is inserted therethrough. In this way, the parts are locked together and electrical contact is maintained. However, such prior art devices suffer from some important defects. Both terminals 4 and 5 are pressed into main housing 1 in their respective directions. As a result, their ability to displace relative to one another is extremely limited. Such movement is further limited by the insertion of end 5A into fitting hole 4B. Thus, there is little or no flexibility between the two terminals and also between either of the terminals and the main housing. Since the housing is normally made of synthetic resin, it has a tendency to expand and contract as the ambient temperature rises and falls. Since the device is intended for use in an automobile, these temperature differences can be substantial. When this occurs, undesirable stresses are induced, especially between terminals 4 and 5 at their point of connection 4A, 5A. EP-A-0 642 169 discloses bulb socket according to the preamble part of the main claim. US-A-5,03 5,643 discloses a lamp socket assembly including a housing, a contact insert and a body. The contact insert is captured in a cavity of the housing by the body. Locks on the body secure the assembly to penal. Contacts are reclaimed in the contact insert by engagement of U-shaped portions thereof in slots of the contact insert. GB-A-2267606 discloses a connection between a shape and a spring contact which has a cable connection tap, the wings of which are folded and crimmed to the cable and SUMMARY OF THE INVENTION The subject matter of the present invention has the object to overcome the defects of the prior art devices. This object is solved by the features of claim 1. Advantageous embodiments are mentioned in the sub-claims. 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 cross-section of the connector assembled; Figure 2 is a cross-section along the line X-X of Figure 1; Figure 3 is a fragmentary cross-section at an initial stage of insertion; Figure 4 is similar to Figure 3 showing an intermediate stage of insertion; Figure 5 is similar to Figure 3 showing complete insertion; Figure 6 is a perspective exploded view showing the connector terminal and the bulb terminal; Figure 7 is similar to Figure 5 showing a second embodiment of the present Invention; Figure 8 is similar to Figure 7 showing a third embodiment of the present Invention; Figure 9 is similar to Figure 7 showing a fourth embodiment of the present Invention; Figure 10 is similar to Figure 6 showing a fifth embodiment of the present Invention; Figure 11 is similar to Figure 1 showing a prior art device; and Figure 12 is similar to Figure 6 showing the prior art device of Figure 11. DETAILED DESCRIPTION OF THE INVENTION The device of the present Invention comprises main housing 11 with bulb socket 12 and connector socket 13 at right angles to each other. Connection chamber 14 is located between bulb socket 12 and connector socket 13 and is in communication therewith. Bulb terminal 20 is located in bulb socket 12 and connector terminal 30 is in connector socket 13. Bulb A (shown in phantom lines) can be inserted into bulb socket 12. Connector terminal 30 comprises leading end 31 carrying engaging element 32 at one end thereof. Stops 33 protrude in a direction transverse to the insertion direction of connector terminal 30 and are adapted to bear against shoulder 16 in insertion opening 15. Thus, connector terminal 30 is inserted into insertion opening 15 until stops 33 abut shoulder 16. At this point, engaging element 32 extends beyond retainer 28 so that insertion end 24 can be hooked over the retainer. Connector terminal 30 is then withdrawn a short distance so that retainer 28 is engaged by element 32. Bulb terminal 20 is provided with side wall 21 and bulb contacts 22. Insertion end 23 includes support 24, retainer plate 25, and spring contact 26. Retaining plate 25 is provided with window 27 terminating, at a point remote from connector socket 13, in retainer 28. Assembly of the device is best shown in Figures 3 to 5. Bulb terminal 20 (see Figure 1) is inserted into bulb socket 12 so that insertion end 23 is located in connection chamber 14. Thereafter, connector terminal 30 is introduced through insertion opening 15 toward insertion end 23 (see Figure 3). The intermediate position is shown in Figure 4. Leading end 31 is urged by spring contact 26 toward retaining plate 25. For a portion of its passage, the distal end of engaging element 32 has projected through window 27. At the position shown in Figure 4, engaging element 32 has begun to ride up over retainer 28 of retaining plate 25. In its final position (Figure 5), engaging element 32 has passed over retainer 28 and engages it. Spring contact 26 continues to urge connector terminal 30 against retaining plate 25, thereby insuring good electrical contact. Engaging element 32 is hooked over retainer 28 so that connector terminal 30 is securely attached to insertion end 23 of the bulb terminal. At the same time, the resilience of spring contact 26 and the gap between retainer 28 and the inside of engaging element 32 permit flexibility of the components to accommodate distortions. due to temperature changes. A second embodiment of the Invention is shown in Figure 7. The difference between this embodiment and the first embodiment resides in rim 41 which replaces U-shaped member 32. The combination of rim 41 and the pressure of spring contact 26 serves to hold connector terminal 30 securely in its proper position and in electrical contact with the bulb terminal, while still permitting movement of connector terminal 30 along the direction of its insertion. Figure 8 shows a third embodiment of the Invention. In this form of the device, locking hole 42 is provided in retaining plate 25. Claw 43 is bent downwardly from connector terminal 30. When insertion end 31 is introduced between retaining plate 25 and spring contact 26, the distal end of claw 43 enters locking hole 42. If withdrawing tension is exerted on connector terminal 30, the distal end of claw 43 bears against a side of locking hole 42 to retain connector terminal 30 in contact with the bulb terminal. Here, too, the provision of a gap (not shown) between the distal end of claw 43 and the adjacent side of locking hole 42 permits the desired movement of connector terminal 30 along its insertion direction. A variation on the foregoing embodiment is to be found in Figure 9. In this case, the parts are reversed and locking opening 45 is in leading end 31 of connector terminal 30. Correspondingly, claw 44 is bent toward support 24 from retaining plate 25. In a manner similar to the embodiment of Figure 8, an attempt to withdraw connector terminal 30 is resisted by the distal end of claw 44 bearing against the side of locking opening 45, while allowing movement along the insertion direction of connector terminal 30. A further embodiment of the Invention is shown in Figure 10. In this case, assembly is carried out by first inserting leading end 51, provided with claw 52, of connector terminal 30 into the main housing. Corresponding to claw 52 is window 57 in retaining plate 55. Insertion end 53 of bulb terminal 20 also includes spring contact 56 and support 54. Thus, as bulb terminal 20 is inserted, guide 58 rides over the slanted surface of claw 52 until window 57 is in register therewith. Claw 52 then enters window 57 and the distal end thereof bears against the side of window 57, thereby preventing withdrawal of bulb terminal 20. By suitable selection of the sizes of claw 52 and window 57, the desired ability of bulb terminal 20 to move vertically (as shown in Figure 10) relative to connector terminal 30 is provided. Although only certain embodiments of the present Invention have been expressly disclosed, such modifications as would be apparent to the person of ordinary skill may be made without departing from the scope thereof. The resilient spring contact is shown herein only on the bulb terminal. However, there is nothing to prevent locating this element on both terminals. In addition, it is also possible, on both terminals. In addition, it is also possible, within the present Invention, to have each terminal preventing the other from being withdrawn from the main housing. In this modification, each would be attached to the main housing without being fixed so that the desired relatively displacement can occur. As can be seen from the foregoing, the present Invention is intended to be broadly construed and not to be limited except by the scope of the claims appended hereto.

Claims: A device for interconnection of a bulb (A) with a power source comprising a generally cylindrical bulb socket (12) having a first longitudinal axis and having a bulb opening at a first end, said bulb socket adapted to receive said bulb through said bulb opening; a generally cylindrical connector socket (13) having a second longitudinal axis and having a power source opening at an outer end, said cylindrical connector socket adapted to receive a connector in contact with said source through said source opening, said first axis being at a substantially right angle to said second axis; a connection chamber (14) in communication with said bulb socket at a second end thereof remote from said first end and in connection with said connector socket at an inner end thereof remote from said outer end, a connector terminal (30) in said connector socket having a leading end (31, 52) extending into said connection chamber, a bulb terminal (20) in said bulb socket having an insertion end (23, 53) extending into said connection chamber, said insertion end is integrally formed with a bent portion and a retaining plate (25, 5 5), said leading end (31, 51) of the connector terminal (30) being inserted between said bent portion and said retaining plate characterized in that that bent portion is a cantilevered spring contact (26, 56) biased toward said retaining plate (25) for providing electrical contact with said leading end (31), that the retaining plate (25) comprises a window (27, 57) and in that said leading end (31) has formed thereon an engaging element (32, 52) adapted to engage the window of the retaining plate (25, 55) to secure connector terminal (30) to the insertion end (23, 53) of the bulb terminal. The device of claim 1 wherein said engaging element (32) is a U-shaped member having one leg attached to said leading end (31), said window (27) being adapted to receive at least a part of said member as said leading end is inserted between said plate and said spring contact. The device of Claim 2 wherein said retaining plate has a retainer (28) at an edge remote from said connector socket, whereby said U-shaped member hooks thereover when said leading end is inserted between said plate and said spring member. The device of Claim 1 wherein said insertion end is provided with a generally planar support (24) substantially parallel to and spaced apart from said retaining plate, said spring contact (26) being between said plate and said support, a portion of said spring contact adapted to bear against said support as said leading end (31) is inserted between said plate and said spring contact. The device of Claim 1 wherein said engaging element comprises a rim (41) extending from said leading end toward said retaining plate, a retainer at an edge of said retaining plate remote from said connector socket, said rim engaging said retainer. The device of Claim 1 wherein said engaging element is a claw (43) on said insertion end, extending from said insertion end toward said plate in a direction opposite to an insertion direction of said connector terminal, a locking hole (42) in said plate into which a distal end of said claw extends, said distal end bearing against a side of said locking hole remote from said connector socket thereby preventing withdrawal of said connector terminal from said insertion end. A device as claimed in claim 1, wherein said engaging element comprises a claw (44) on said retaining plate extending towards said leading end (31) in the insertion direction of said connector terminal and a locking hole (45) in said leading end (31) into which a distal end of said claw (44) extends, said distal end bearing against a side of said locking hole (42) remote from said connector socket.

Inventors: MUTA JUNJI, MUTA, JUNJI, Muta, Junji, c/o Sumitomo Wir. Sys. Ltd.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1997
Main classification: H01R33
IPC codes: H01R33