Low profile lamp socket assembly and method of making

Abstract: This invention pertains to a lamp socket assembly for use in automotive applications and the like. The assembly includes a housing (12), a contact insert (26), and a body (14). The contact insert (26) is captured in the cavity (25) of the housing by the body (14). The body (14) is welded to the housing (12). Lugs (36) on the body (14) secure the assembly to a panel. A seal (18) is placed between a flange (24) on the housing (12) and the panel to seal the assembly to the panel. Contacts (28) are retained in the contact insert (26) by engagement of U-shaped portions (114) in slots (158) of the contact inserts (26). Blade terminals (46) are inserted through windows (47) in the housing (12), contact insert (26), and contacts (28) to interlock the terminals (46) with the contacts (28) and to keep the contacts (28) secured in their positions. A socket connector (20) is sealingly secured to the housing (12) and prevents moisture from entering the housing. In an alternative embodiment, no socket connector (20) is provided but the blade terminals (46) are crimped to wires (198) for connecting the socket assembly to a source of electric power. In still another embodiment, the socket connector (20) includes a protrusion for interlocking the body (14) and the housing (12) together.

Description: This invention relates to lamp socket assemblies and in particular to lamp socket assemblies such as are used in tail lights of automobiles and the like. Many such lamp socket designs have been provided in the prior art. However, these prior art lamp socket assemblies have had a number of problems associated with them. One problem with such prior art light socket assemblies has been that they are rather complicated and therefore costly to manufacture and assemble. Another problem has been that the electrical contact parts of many such socket assemblies have been subject to corrosion thereby leading to failure of the assemblies. In an effort to provide proper seals for tail light assemblies, some manufacturers have provided large cut-outs in the metal panels of the automobile trunk and have then mounted the tail light lamp socket assembly on a lay up. The entire layup was then secured to the metal panel, such as by screws, with a seal or gasket inserted between the layup and the metal panel. Not only have such lamp assemblies been rather costly to manufacture, but servicing such assemblies, for instance for replacement of burned out bulbs, is quite time consuming and may result in failure to properly install the lamp seal with attendant corrosion problems. In the use of prior art lamp socket assemblies, the lamp sockets themselves generally extend into the trunk space of the car. This results in several problems. First of all, by extending a substantial distance into the trunk area, the sockets are subject to damage by items stored in the trunk. Some sockets are not adequately secured in place and are easily knocked out of the trunk panel. Furthermore, with the advent of smaller cars, there is less trunk space available then previously and therefore it is undesirable to have the lamp socket assemblies extend very far into the trunk space. Some prior art lamp socket assemblies have used a bayonet type of socket which uses a compression spring to ensure proper contact with the bulb. Such sockets are particularly undesirable as the compression spring causes the socket to have a rather high profile which extends a substantial distance into the trunk space. Still other prior art lamp socket assemblies have sought to achieve a low profile by using potted contact structures. These devices are expensive to construct and furthermore are difficult to service. Still other prior art lamp socket assemblies have been provided wherein the base of the unit is resilient and forms the seal for the assembly. This type of structure is easily over-torqued and damaged when it is installed in an automobile. Still a further problem with prior art socket assemblies has been that, to achieve a different focal length, an entire new socket assembly had to be constructed. This required substantial investment in tooling and therefore made the socket assemblies rather expensive to manufacture. It is therefore desired to provide a lamp socket assembly which uses a substantial number of common parts to achieve structures having various focal lengths. Some automobile light assemblies, such as tail light assemblies, comprise a sealed assembly including a housing and lenses for the tail lights. The housing includes apertures for the insertion of socket assemblies, with the bulb of such assemblies inserted into the housing. It is therefore desired to provide a socket assembly for use with such sealed tail light assemblies wherein the socket assembly is sealed to the housing. It is therefore desired to provide a lamp socket assembly which is simple in construction and which has a low profile. It is furthermore desired to provide a lamp socket assembly which requires only a small cut-out in an automobile panel and which may be sealed to the panel of the automobile without the use of expensive and large gaskets. Additionally, it is desired to provide a lamp socket assembly which may be used with sealed lamp structures and wherein the socket assembly is sealed to the lamp structure to prevent moisture from entering thereinto. Still further it is desired to provide a sealed lamp socket assembly which may be used without a connector so that a complete tail lamp assembly having a number of sockets may use a single connector. The present invention overcomes the disadvantages of the above described prior art lamp socket assemblies by providing an improved design therefore. The lamp socket assembly according to the present invention includes a base or housing, a body, and a contact insert into which a plurality of contacts have been inserted. The contact insert is captured in a cavity in the housing by the body. The body is also captured in a cavity of the housing and is then sonic welded to the housing. The present invention includes a molded housing, body, and contact insert. The housing includes a cavity into which the contact insert is placed after electrical contacts have been inserted therein. The body is then inserted into the cavity and captures the contact insert therein. The body is then welded to the housing. A plurality of blade terminals are then inserted into the body to capture the contacts in the contact insert. A flange seal is provided to seal the housing to the metal panel of an automobile and lugs which are spaced around the body secure the lamp socket assembly to the automobile panel. A socket connector is connected to the housing and is sealed thereto by means of a resilient seal. Wires connected to the socket connector are sealed to the socket connector by means of a seal. Thus the entire structure internal to the housing is sealed and therefore protected from moisture and corrosion. In an alternative embodiment, the present invention comprises a socket assembly without the use of a socket connector. Thus, the electrical wires are directly connected to the blade terminals and the wires are sealed to the housing by means of a wire seal. By means of this arrangement, the number of socket assemblies may be combined to be connected to a source of electrical supply by a single connector. Thus, for instance, a tail light assembly including a plurality of socket assemblies, such as three socket assemblies, be connected to a source of electric energy by a single socket connector. One advantage of the present invention is that the lamp socket assembly is completely sealed to the automobile tail light assembly with a resealable seal. Therefore, if a lamp structure is removed, for instance for replacing a bulb therein, the entire socket may be easily resealed simply by installation of the socket assembly. Another advantage of the present invention is that the lamp socket assembly is easy to install by simply inserting the assembly into a relatively small aperture in the automobile light assembly and by a subsequent twisting movement whereby the camming lugs on the body secure the entire socket assembly to the light assembly. Yet another advantage of the present invention is that the socket assembly allows a low profile whereby it extends only a small distance into the automobile trunk space. Furthermore, the prefered low profile is maintained despite differences in focal length for various lamp socket assembly designs. Thus, only the body of the socket assembly varies in length whereby the lamp socket assembly extends further outside the trunk space but not into the trunk space. A further advantage of the lamp socket assembly according to the present invention is that the lamp socket is sealed to the light assembly so that the lamp contacts will not corrode. Yet a further advantage of the present invention is that the lamp bulbs are easy to replace so that the lamp socket is easy to service. The socket merely needs to be removed from the automobile light assembly by a twisting motion, the lamp is pulled out of the socket with a straight pulling motion and a new lamp is inserted. The entire assembly is then reinstalled by extending the lamp through the aperture in the automobile light assembly and by a twisting movement of the socket assembly. Yet another advantage of the present invention is that the lamp socket assembly is not always easily damaged because it preferably does not extend very far into the trunk space. The present invention, in one form thereof, comprises a lamp socket assembly having a housing. The housing has a cavity therein. A body is received in the housing cavity. The body includes a plurality of camming lugs for retaining the lamp socket assembly in a mounted position in an apertured panel. The body also includes a through passage for receiving a lamp base therein. The body includes fingers for retaining the lamp base in the through passage. A contact insert is received in the housing cavity. The contact insert includes a groove for receiving the lamp base therein. The contact insert includes slots for receiving and retaining a plurality of contacts. A plurality of blade terminals are interlocked to the contact insert, the respective contacts, and the housing. The lamp socket assembly according to the present invention, in one form thereof, includes a housing which has a cavity therein. A contact insert receiving means is located in the housing cavity. A contact insert is received in the contact insert receiving means. A plurality of contacts are retained in the contact insert. A body is received in the cavity, the body including a through aperture for receiving a lamp base therein so that the lamp filaments are electrically connected to the contacts. Welding projections are located in the housing cavity for welding the body to the housing. A socket connector is received in the housing. A first seal coacts with the socket connector and the housing for sealing engagement therebetween. A second seal coacts with the housing for sealing the socket assembly to the panel. The lamp socket assembly according to the present invention, in one form thereof, includes a housing which has a cavity therein. A generally cylindrical body is received in the housing cavity and is secured therein. The body includes a through aperture for receiving a lamp base therein. A contact insert including a base portion and a contact supporting portion is provided with the base portion thereof received in the housing cavity and retained therein by the body. The contact supporting portion of the contact insert is received in the through aperture of the body. Retaining fingers which are integral with the body are provided for retaining a lamp base in the body through aperture. A plurality of lugs are spaced around the body for retaining the socket assembly secured to a panel. A plurality of contacts are supported in the contact insert. A socket connector is received in the housing. A first seal coacts with the socket connector and housing for sealing engagement therebetween. A second seal coacts with the housing for sealing the socket assembly to a panel. A third seal coacts with the socket connector for sealing wires connected to the socket connector. The present invention, in one form thereon, comprises a method for making a lamp socket assembly by providing a housing having a cavity therein, a body, and a contact insert. The contact insert is inserted into the cavity and the body is thereafter inserted into the cavity. The body is then welded to the housing. The present invention, in one form thereof, comprises a method of making a lamp socket assembly comprising molding the housing with a cavity therein, molding a body, and molding a contact insert. A plurality of contacts are provided and inserted into the contact insert. The contact insert is then placed into the cavity. The body is placed in the cavity and is then welded to the housing. The present invention, in one form thereof, comprises a method for making a lamp socket assembly including molding a housing with a cavity therein, a body with a through passage therein, and a contact insert. A plurality of contacts are inserted into the contact insert. The contact insert is then placed into the cavity, the body is placed into the cavity with at least a portion of the contact insert received in the through passage. The body is then welded to the housing. It is therefore an object of the present invention to provide a sealed low profile lamp socket assembly which includes resealable seals, which is easy to install, which can accommodate various focal lengths and which extends into the trunk space of an automobile by only a small distance. The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings wherein: Fig. 1 is a front elevational view of the lamp socket assembly according to the present invention; Fig. 2 is a top plan view of the socket assembly of Fig. 1 rotated through 90°; Fig. 3 is a cross sectional view of the socket assembly of Fig. 1 taken along line 3-3 of Fig. 2; Fig. 4 is a cross sectional view of the lamp socket assembly of Fig. 1 taken along line 4-4 thereof; Fig. 5 is a top plan view of the housing for the socket assembly of Fig. 1; Fig. 6 is a cross sectional view of the housing of Fig. 5 taken along lines 6-6 thereof; Fig. 7 is an enlarged detailed view of the upper portion of an energy director shown in Fig. 5; Fig. 8 is a bottom plan view of the housing of Fig. 5; Fig. 9 is a cross sectional view of an embodiment of a socket assembly according to the present invention with a different focal length; Fig. 10 is a top plan view of a body for the socket assembly of Fig. 1; Fig. 11 is a section of the body of Fig. 10 taken along line 11 -11 thereof; Fig. 12 is a sectional view of the body of Fig. 10 taken along line 12-12 thereof; Fig. 13 is a side view of the body of Fig. 10 taken from the right hand side thereof; Fig. 14 is a bottom plan view of the body of Fig. 10; Fig. 15 is a front elevational view of a terminal for the lamp socket assembly of Fig. 1; Fig. 16 is a side elevational view of the terminal of Fig. 15 taken from the left hand side thereof; Fig. 17 is a bottom plan view of the terminal of Fig. 15; Fig. 18 is a side elevational view of another terminal for the socket assembly of Fig. 1; Fig. 19 is a front elevational view of a blade terminal for the socket assembly of Fig. 1; Fig. 20 is a side elevational view of the blade terminal of Fig. 19; Fig. 21 is a top plan view of a contact insert for the socket assembly of Fig. 1; Fig. 22 is a side elevational view of the contact insert of Fig. 21; Fig. 23 is a cross sectional view of the contact insert of Fig. 21 taken along line 23-23 thereof; Fig. 24 is a cross sectional view of the contact insert of Fig. 21 taken along line 24-24 thereof; Fig. 25 is a cross sectional view of the contact insert of Fig. 21 taken along line 25-25 of Fig. 22; Fig. 26 is a top plan view of a flange seal for the socket assembly of Fig. 1; Fig. 27 is an enlarged cross sectional view of the flange seal of Fig. 26 taken along line 27-27 thereof; Fig. 28 is a top plan view of a locking wedge for use with an alternative embodiment of the lamp socket assembly according to the present invention; Fig. 29 is a side elevational view of the locking wedge of Fig. 28; Fig. 30 is a cross sectional view of an alternative embodiment of a socket assembly including the locking wedge of Fig. 28; Fig. 31 is a cross sectional view of a connectorless alternative embodiment of a socket assembly according to the present invention; Fig. 32 is a cross sectional view of the socket assembly of Fig. 31 along lines 32-32 of Fig. 31. Corresponding reference characters indicate corresponding parts throughout the several views of the drawings. The exemplifications set out herein illustrate preferred embodiments of the invention, in one form thereof, and such exemplifications are not to be construed as limiting the scope of the disclosure or the scope of the invention in any manner. Referring to Figs. 1 - 4 there is shown a preferred embodiment of the lamp socket assembly 10. The assembly includes a base or housing 12, a body 14, and a bulb or lamp 16 shown here as a two-filament lamp. It should be noted that the lamp socket assembly of the present invention can accommodate lamps with various numbers of filaments. The lamp includes a lamp base 17 which is inserted into lamp socket assembly 10. A flange seal 18 is provided for sealing the lamp socket assembly 10 to a panel, such as an automobile panel. A socket connector 20, as best shown in Figs. 2 and 3, is inserted into a socket 22. Socket connector 20 includes electrical connector terminals (not shown) which are connected to wires (not shown) for connecting the lamp socket assembly to a source of electric power. It should be noted that, while not illustrated herein, the socket assembly may be used with a sealed light assembly, such as an automobile tail light assembly. Such assemblies include a lens and a housing wherein the lens is sonically welded to the housing. Thus, moisture cannot enter the assembly except through the access holes into which the socket assemblies are inserted. By providing proper sealing of the socket assembly access holes, such as disclosed for the socket assembly according to the present invention, the entire light assembly is sealed. Thus the lamps or light bulbs will be internal to the light assembly and will be completely sealed as further described hereinafter. It should also be noted that such light assemblies may be used not only for tail lights for automobiles but also for the turning lights, running lights, etc. Furthermore, such assemblies may also be used in other vehicles such as, for instance, boats. Flange seal 18 is seated on a mounting flange 24 and seals that flange and therefore the entire lamp socket assembly to an automobile panel. Base 12 includes a socket cavity 25 in which a contact insert 26 is received. Contact insert 26 includes a plurality of contacts 28. The number of contacts 28 may vary depending upon whether the lamp socket assembly is intended for a single or double filament lamp. Contact insert 26 is captured in socket cavity 25 by means of body 14. Body 14 is sonic welded or secured in some other suitable fashion to base 12 as further described hereinafter. Body 14 includes locking lugs 36a, 38b, and 36c. The locking lugs 36 are used to lock the entire socket assembly to a panel. Thus the panel would have only a relatively small opening therein including cut-out portions to accommodate locking lugs 36. Each of the locking lugs 36 has a different shape so that the assembly is keyed to the opening in the panel and cannot be inserted incorrectly. The entire lamp socket assembly is thus inserted into the panel aperture and, in the case of an automobile tail light, is inserted with the assembly base 12 extending into the trunk space and the glass envelope of the lamp 16 extending outside the trunk space into the sealed tail light assembly. Seal 18 provides a moisture barrier for the aperture of the tail light assembly. Lamp 16 is retained in lamp socket assembly 10 by means of retaining fingers 38 which are integrally molded with body 14 and are resiliently hingedly connected to the main part of body 14. Lamp base 17 includes a pair of grooves 39a and 39b. Retaining fingers 38 which have matching projections thereon for engaging grooves 39a and 39b retains the lamp 16 securely in the lamp socket assembly. Thus when the lamp socket assembly 10 is installed in a tail light assembly, the panel would be captured between the bottom surfaces of lugs 36 and the top of flange seal 18. By compressing seal 18 to a predetermined pressure per square inch, the assembly would be properly sealed against moisture. It should also be noted that by changing the portion of body 14 which extends upwardly from lugs 36, as shown in Fig. 1, the focal length of the lamp socket assembly can be varied. The focal length is the distance "a", shown in Fig. 1, between the bottom of lugs 36 and the location of the lamp filament. Thus one advantage of the instant lamp socket design is that, by simply changing the length of the body 14 and the length of the contact insert 26, the focal length of the entire assembly can be varied while retaining the same base 12. Body 14 includes a through passage 42 into which the lamp base 17 and the contact insert 26 is received. It can be seen in Fig. 2 that contact insert 26 includes a pair of contact insert posts 40, as further described hereinafter, between which lamp base 17 is received. Lamp base 17 includes contact wires 44 for contacting electrical contacts 28 to provide electric power to the lamp filaments. Blade terminals 46 in turn contact electrical contacts 28 as further explained hereinafter to provide the electrical connection between the wires leading up to the socket and contacts 28. Blade terminals 46 are captured in socket cavity 25 by means of struck out tabs 48 in the blade terminals and shoulder 50 in cavity 25 of housing 12. Thus, once the blade terminals 46 have been inserted into the assembly and capture contacts 28 therein, as explained hereinafter, the blade terminals 46 cannot be retracted or pulled out. The entire assembly includes further seals for preventing moisture from reaching the interior of socket cavity 25 and possibly corroding the electrical contacts. Thus, as best seen in Fig. 3, wire seal 56 is provided in a cavity 57 of socket connector 20. The wire seal includes a plurality of wire apertures through which the individual wires (not shown) extend. Seal 56 also includes ribs 64 to provide a positive moisture seal. Thus no moisture can leak into the socket cavity past the connecting wires. A ring seal 58 is provided around socket connector 20 to seal the socket connector 20 in socket 22 of base 12. It should be noted that ribs 66 are provided to insure a positive seal. Socket wire seal 56 and ring seal 58 are preferably manufactured of a resilient and flexible material such as, for instance, silicone. Similarly, flange seal 18 is preferably manufactured of a resilient and flexible material such as silicone. By means of the three seals 18, 56, and 58, the interior of cavity 25 is sealed against moisture and no moisture will be able to enter socket cavity 25 from the automobile trunk space. Referring now to Figs. 5 - 8, the base or housing 12 of the socket assembly is shown. In particular, by referring to Fig. 5, it can be seen that a plurality of energy directors or ribs are provided on the bottom surface of the socket cavity 25. By referring to the detailed partial view of Fig. 7, it can be seen that triangular portions 72 are provided on the top surfaces of the energy directors 70. Energy directors 70 are used for welding the body 14 to base 12 by means of sonic welding. The provision of the energy directors 70 ensures secure attachment of the body and base. It should be noted, by reference to Fig. 3, that energy directors 70 extend axially upwardly in cavity 25 from the bottom wall 80 of the cavity. The number of energy directors 70, their height and thickness as seen in Fig. 6, and their spacing is critical. As further illustrated in Fig. 1, the space between the bottom surface of lugs 36 and the top surface of mounting flange 24 must be closely held during the assembly of body 14 to housing 12 in order to achieve the proper compression of seal 18 in the mounting of lamp socket assembly in a panel (not shown). By selecting the proper height, thickness, spacing and number of energy directors, this space for accommodating the panel thickness can be closely held. Base 12 also includes a key 74 which is used for properly orienting body 14 with regard to base 12. Two contact insert keys 76 are also provided in cavity 25 along with a locating projection 82 to properly locate contact insert 26 in cavity 25. Socket 22 includes a pair of windows or apertures 78 for securement therein of a pair of fingers (not shown) which are part of socket connector 20 and which lock socket connector 20 to housing 12. Referring now to Figs. 10 - 14, body 14 is shown. The body includes a through aperture or passage 42 and a pair of ribs 90 therein. These ribs guide lamp base 17 when it is inserted into the through passage 42. Retaining fingers 38 are molded integrally with body 14 and are hinged at 106. Fingers 38 are therefore resiliently connected and are biased inwardly into through passage 42 so that they firmly grasp a lamp base 17. The fingers can move outwardly into spaces 92 located directly behind fingers 38. Slots 93 are located immediately adjacent to fingers 38. A key slot 94 is provided in body 14 to cooperate with key 74 in socket cavity 25 to properly orient body 14 during assembly thereof to base 12. A further slot 96 is provided in the lower portion of body 14 for accommodating contact insert 26 during assembly thereof to base 12 and body 14. One or more ribs 98 are provided on the bottom of body 14 for cooperating with energy director 70 and for welding body 14 to base 12. Some of the energy directors 70 also contact bottom surface 100 of body 14 for securement thereto by means of sonic welding. By referring to Figs. 1 and 13, it can be seen that lugs 36 include camming surfaces 102. Camming surfaces 102 enable the lamp socket assembly to be properly assembled to an automobile panel or tail light housing by camming over the surface of the automobile panel or tail light housing to provide sufficient pressure between flange seal 18 and the panel or housing to form a proper seal. Lastly, shoulders 104 are provided in through passage 42 to accommodate and guide a lamp base 17 during its insertion thereof into through passage 42. Base 12, body 14, and contact insert 26 and socket 20 may all be molded from a suitable insulating material such as, for instance, nylon which may be glass filled. This material is sufficiently rigid so that it cooperates properly with flexible resilient seals 18, 56, and 58 to properly seal the structure against moisture as described hereinabove. Turning now to Figs. 15 - 18, electrical contacts 28 for the lamp socket assembly 10 are illustrated. The contacts are constructed of a suitable conductive material, such as brass. The contacts include U-shaped bent portions 114 which have a window 116 therein for insertion of blade terminals 46 therethrough as shown in Figs. 3 and 4. The contacts 28 include a contacting portion 118 and a bent portion 119 for contacting lamp contact wires 44. U-shaped bent portion 114 includes a bottom leg 124 and an upper leg 126. Upper leg 126 includes a struck out protrusion 122 for providing proper contact with blade terminal 46 during insertion thereof into the assembly. Figs. 15, 16, and 17 show a terminal for the assembly. Fig. 18 shows a ground terminal for the assembly. The ground terminal has an offset portion 128 whereby the terminal may be inserted into the contact insert in one lateral location whereas the main body of the terminal is offset from that location for proper contact. Figs. 19 and 20 show a blade terminal. Blade terminal 46 is a planar terminal having two end portions 142, 144 which are somewhat thinner than central portion 146. Central portion 146 includes a struck out tab 48 for preventing blade terminal 46 from being pulled out of the socket assembly once it has been assembled thereinto. End portion 144 is inserted into the base 12 through a window 116 of a contact 28 as further explained hereinafter. End portion 142 extends into socket 22 for contacting a terminal (not shown) in socket connector 20. Figs. 21 - 25 show a contact insert 26. Contact insert 26 includes a base 150 which is generally planar. A pair of walls 152 are integrally formed with base 150 and extend upwardly therefrom to form a groove 153 therebetween. Key slots 154 are provided at either end of base 150 for cooperating with keys 76 in socket cavity 25 of base 12 for properly orienting the contact insert 26 during assembly thereof to base 12. Additionally a key aperture 160 is provided centrally of base 150 for proper orientation of the contact insert 26 during assembly thereof to base 12. Base 150 includes a plurality of windows 156 and slots 158 for accommodating contacts 28 and blade terminals 46. Posts 40 are formed integrally with and extend upwardly from base 50 for properly guiding a lamp base 17 into groove 153. Figs. 26 and 27 show the flange seal 18. The flange seal comprises a flange 168 with a pair of upstanding ribs 164 at the outer perimeter thereof. An aperture 166 is provided in the flange seal for accommodating body 14. Referring now to Figs. 1 - 3, the lamp socket assembly is assembled as follows. Molded contact insert 26 is first assembled with a set of contacts 28. The U-shaped bent portion 114 of each contact is inserted into the appropriate slot 158 of base 150 of the contact insert with the rounded portion 118 of the contact facing groove 153. Since the material from which the contacts 28 are made is somewhat resilient, the contacts are resiliently retained in slots 158. Contact insert 26 is then inserted into cavity 25 of base 12. Because of the location of keys 76 and 82, improper assembly of the contact insert 26 in base 12 is prevented. Body 14 is now inserted into socket cavity 25 and is properly oriented therein by means of key 74 and key slot 94. Body 14 captures contact insert 26 in cavity 25 by engagement of contact insert base 50 in contact insert slot 96 of body 14. Thus the contact insert is properly captured and is immovably fixed in socket cavity 25. The assembly is now subjected to sonic welding or another suitable welding technique which is applied to bottom 80 of base 12. Sonic welding is a well known process and therefore need not be explained further herein. The provision of energy directors 70 with upstanding triangular ribs 72 thereon provides proper guidance to the energy applied by the sonic welding process to provide melting of portions 72 and securement of body 14 to base or housing 12. If sonic welding is used, as explained hereinbefore, the thickness and height of the energy directors 70 is critical for the particular spacing and number of energy directors shown. The energy directors are axially oriented with respect to the cavity 25 and body 14. Thus as the body and housing are welded together, the energy directors will melt and the body 14 will enter the cavity 25 further. Sonic welding will be stopped when the distance between the bottom surface of lugs 36 and the top surface of mounting flange 24 is within prescribed limits. By proper design of axial energy directors 70, the strength and uniformity of the sonic weld will be within acceptable tolerances. An appropriate number of blade terminals 46 are now inserted through windows 47 of base 12, windows 156 of contact insert 26 and windows 116 of contacts 28, thereby capturing the contacts 28 firmly in contact insert 26 and the contact insert in base 12. Blade terminals 46 are retained in the assembly by means of tabs 48 which interlock with blade retaining shoulder 50 of base 12. A socket insert 20 is now provided with seals 56 and 58 and with appropriate wires and contact terminals (not shown). Socket 20 is inserted into socket 22 to complete the assembly. It can thus be seen that the entire assembly is extremely simple and forms a sealed structure to prevent contamination and corrosion of the electrical contacts by moisture. Furthermore, it can be seen that the portion of the socket assembly extending into the trunk space of an automobile, namely base or housing 12, is very small indeed. The typical extension of the base 12 into the trunk area is 1/2" or less. Referring now to Fig. 9, it can be seen that various assemblies with different focal lengths may be provided utilizing the same basic socket assembly design. By referring to the focal length "a" of Fig. 1 and comparing this to the focal length "b" of Fig. 9, it can be seen that they are different. The focal length is defined as the distance from the bottom of lugs 36 to the filament location. The body 14 of the assembly of Fig. 9 has a higher extension "c" extending beyond the top surface of lugs 36 (schematically illustrated) than the body 14 illustrated in Fig. 1. Therefore the focal length of the assembly of Fig. 9 is different and longer than the focal length of the assembly of Fig. 1. By varying the distance "c", the focal length of the structure can be changed in a very simple manner. Base 12 of the assembly Fig. 9 is identical to the base 12 of the assembly of Fig. 1. Thus, the longer focal length of the assembly of Fig. 9 is accompanied by an identical extension of base 12 into the trunk space of the automobile. The assembly of Fig. 9 also utilizes a different contact insert 26 and contacts 28 than the assembly of Fig. 1 in order for the lamp base 17 to be able to reach contacts 28. The contacts 28 of Fig. 9 also have longer extensions as can be seen by comparing the contacts 28 of Figs. 3 and 9. Thus, it can be seen that the structure can be adjusted for a variety of focal lengths by the simple provision of a different body 14, contact insert 26, and contacts 28. The extension of the assembly into the useable trunk space remains the same. Referring now to Figs. 28 - 30, there is shown a further embodiment of the present invention including a locking wedge which locks together base 12 and body 14. The locking wedge is inserted into a slot 172 of the socket connector 20. The locking wedge includes a planar tab portion 176 having a pair of shoulders 178a and 178b which are keyed with respect to slot 172 so that the locking wedge can only be inserted in a desired orientation. Tab 176 includes a U-shaped slot 180 which forms a wedge locking tab 182 and which is so molded as to extend resiliently upwardly as shown in Fig. 30. Thus, wedge locking tab 182, upon insertion of locking wedge 174 into slot 172, will snap into space 183 to prevent the locking wedge from being pulled out of connector 20. Stops 184 abut against connector 20 to prevent locking wedge 174 from being inserted too far into slot 172. The purpose of the locking wedge is to prevent the resilient fingers 186 of connector 20 from being displaced upwardly and to ensure that locking tabs 188 of fingers 186 will engage with the connectors (not shown) to provide proper contact thereof with blade terminals 46. Locking wedge 174 also includes a snout or protrusion 190 which, upon insertion of connector 20 into socket 22, will be inserted into aperture 192 of housing 12 and aperture 194 of body 14. Apertures 192 and 194 are aligned whereby snout 190 may be simultaneously inserted thereinto. Snout 190 ensures that body 14 will be locked in place, even if the weld connecting body 14 to housing 12 should fail. Thus, upon insertion of the socket connector 20, the entire socket assembly is locked together. While the protrusion 190 is located on the locking wedge it should be noted that it could be placed elsewhere on the socket connector. Referring now to Figs. 31 and 32, there is shown an alternative embodiment of the invention. These figures disclose a connectorless socket assembly. Instead of the use of a socket connector including contacts for connecting with blade terminals 46, this embodiment does not use a socket connector. Rather, wires 198 are directly crimped to blade terminals 202 by means of crimps 200. Alternatively, wires 198 could be soldered to the blade terminals 202. The wires are sealed in socket 22 of housing 12 by means of a wire seal 56 as described hereinabove. In the assembly of this embodiment, the blade terminals are crimped to wires 198, a seal 56 is then slipped over the blade terminals and wires 198, the blade terminals 202 are then inserted into the socket assembly and the seal is placed into socket 22 to seal the wires 198. Thus, in this particular version, a connector would be placed downstream of wires 198. Further, several socket assemblies could be connected to a single connector. For instance, in a tail light assembly of an automobile, several socket assemblies such as, for instance, three, might be used whereas whereas a single connector would be used to connect three socket assemblies to the wiring harness of the automobile. While this invention is described as having a preferred design, it will be understood that it is capable of further modification. Further, while this invention has been described for use in connection with an automobile tail light assembly, it should be understood that it is capable for use with other light assemblies such as automobile turning lights, running lights, etc. This application is therefore intended to cover any variations, uses, or adaptations of the invention following the general principles thereof and including such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and fall within the limits of the appended claims.

Claims: A lamp socket assembly comprising: a housing (12), said housing (12) including a first cavity (25); characterized by a body (14) received in said first cavity (25), said body (14) including a plurality of camming lugs (36) for retaining said lamp socket assembly in a mounted position in an apertured panel, said body further including a through passage (42) for receiving a lamp base (17) therein and means (38) for retaining said lamp base (17) in said through passage(42), a contact insert (26) received in said first cavity (25), said contact insert (26) including a groove (153) for receiving said lamp base (17) therein, said contact insert (26) including means (158) for receiving and retaining a plurality of contacts (28); and a plurality of blade terminals (46) interlocked with said contact insert (26), respective said contacts (28), and said housing (12). The assembly according to Claim 1 including sealing means (18) for sealing said assembly to a said panel. The assembly according to Claim 1 including a socket connector (20), a socket seal (58) for sealing said socket connector (20) to said housing (12), and a wire seal (56) for forming a sealing connection between a plurality of wires (198) and said socket connector (20). The assembly according to Claim 3 wherein said socket connector includes means (190) for locking said body to said housing. The assembly according to Claim 3 wherein said socket connector (20) includes a projection (190) which engages with aligned apertures (192,194) in said body (14) and housing (12) to lock said body (14) and housing (12) together. The assembly according to Claim 1 including a welding projection (70) in said cavity for welding said body (14) to said housing (12). The assembly according to Claim 1 including shoulder means (50) located in said cavity (25) for cooperating with retaining means (48) on said blade terminals (46) for retaining said blade terminals in their assembled positions. The assembly according to Claim 1 including first and second key means (74,76) for cooperating with said body (14) and said contact insert (26) for insuring proper alignment between said body (14), contact insert (26), and housing (12). The assembly according to Claim 1 wherein said body (14) is substantially cylindrical. The assembly according to Claim 1 wherein said means (38) for retaining said lamp base (17) comprises a pair of integrally molded resilient fingers (38a,38b) for resiliently engaging a groove (39a,39b) in said lamp base (17). The assembly according to Claim 1 wherein said contact insert (26) and said contacts (28) include windows (47) for receiving said blade terminals (46) therein. The assembly according to Claim 1 wherein said contact insert (26) includes a pair of posts (40a,40b) for receiving said lamp base (17) therebetween. The assembly according to Claim 1 wherein said means (158) for retaining said plurality of contacts comprises a plurality of slots (158). The assembly according to Claim 13 wherein said contacts (28) each include a U-shaped portion (114)for resiliently seating in a respective said slot (158). A method of making a lamp socket assembly comprising: molding a housing (12) with a cavity (25) therein; molding a body (14); molding a contact insert (26); providing a plurality of contacts (28) and inserting said contacts (28) into said contact insert (26); placing said contact insert (26) and contacts (28) into said cavity (25); placing said body (14) into said cavity (25); and welding said body (14) to said housing (12). The method according to Claim 15 including the step of inserting blade terminals (46) in interlocking engagement with said housing (12), said contact insert (26), and said contacts (28). The method according to Claim 15 including providing a seal (18) for sealing said assembly to a panel. The method according to Claim 15 wherein said housing (12), body (14), and contact insert (26) are made of rigid plastic.

Inventors: FORISH JOHN A, ROGERS JOHN J, FORISH, JOHN A., ROGERS, JOHN J.
Applicants: ZANXX INC, ZANXX, INC.
Application year: 1990
Main classification: F21M7
IPC codes: H01R43, H01R33