Патент USA US2118672код для вставки
May 24, 1938. T. c. GREEN 2,118,672 JOINT AND CONNECTER Filed Sept. 14, 1956 INVENTOR BYTHOMAS C. GREEN Q M ATTORNEY 2,118,672 Patented May 24, 1938 UNITED STATES PATENT OFFICE 2,118,672 JOINT AND CONNECTER Thomas C. Green, United States Marine Corps Application September 14, 1936, Serial No. 100,689 3 Claims. (01. 285-47) (Granted under the act of March 3, 1883, as amended April 30, 1928; 3'70 0. G. 757) stalling the through connecter in the outlet hole My invention relates to an electrically con thereof, electrical contact between the sides of tinuous, substantially ?uid impervious joint and the junction box and the through connecter is to a connecter for connecting together an elec dependent upon some part of the connecter rub trically conductive element provided with an bing away sufficient paint during installation to 5 opening and an electrically conductive casing ele make contact with the metal beneath. During ment and for insuring electrical continuity and installation the nut is usually the connecter part continuity of passage therebetween. which is rotated in order to secure the connecter In order to effectively shield extraneous appa tightly in place and consequently when fortuitous ratus against electro-magnetic and electro-static electrical contact occurs between the connecter 10 disturbances caused by ignition circuits of inter and the sides of the junction box it is usually be nal combustion engines, it is essential that the tween a face of the nut and the outside wall of circuit be completely enveloped by a metallic sur the junction box, where this mutual contact is face; that the enveloping metallic surface be most subject to destruction by oil or corrosion grounded at its ends and at suitable intervals to moisture. therebetween; and that the enveloping metallic due With the foregoing preliminary discussion in surface be electrically continuous throughout its view, it is an object of my invention to provide a length. Failure of the enveloping metallic sur joint wherein the juncture between the joint face to properly and effectively shield against the parts is sealed against the exterior whereby elec— deleterious disturbances generated by the ignition trical continuity through the joint is insured. 20 circuits is caused principally by lack of electri It is another object of my invention to provide cal continuity along the enveloping metallic sur an electrically continuous joint wherein the junc face, or an increase in resistance of the envelop ing metallic surface over that at which optimum ture between the joint parts is maintained by direct and intimate metallic contact, the said shielding is obtained. This lack of electrical con tinuity or increase of resistance.takes place at the connecters and joints. forming a part of the enveloping metallic surface. As long as the con tacting surfaces of the connecters and joints are , in intimate metallic contact and remain free from dirt, oil, gasoline, or other extraneous matter, the enveloping metallic surface will effectively shield. If, however, the contacting surfaces of the con necters and joints are not in intimate metallic contact, or do not remain free from extraneous matter, there will be a lack of electrical con tinuity or an increase of resistance through the connecters and joints with attendant interrup tion or mal-functioning in the shielding proper ties of the enveloping metallic surface. J40 Shielding failure in aircraft shielding assem blies is commonly caused by the through con necter which connects a junction box adjacent juncture being sealed against the exterior to thus ' preserve unaltered the resistance through the joint. it is another and further object of my inven tion to provide a connecter for connecting an electrically conductive casing element to an elec 30 trically conductive element having an opening, and for insuring electrical continuity and con tinuity of passage therebetween. it is another and still further object of my in vention to provide a connecter for connecting an 35 electrically conductive casing element to an elec trically conductive element having an opening, and for insuring electrical continuity and con tinuity of passage therebetween, wherein 'the juncture between the connecter parts and the 40 juncture between one end of the connecter and the electrically conductive element adjacent the the opening therein with a shielding conduit or - opening therein are maintained by direct and by the joint which this connecter makes with the intimate metallic contact, the said junctures being wall or partition of the junction box adjacent sealed against the exterior to thus preserve un 45 the opening or outlet therein, since both con altered the resistance therethrough and to in necter and joint fail to perform their primary sure electrical continuity from one electrically function of providing electrical continuity be conductive element to the other. Other objects and many of the attendant ad 50 tween the junction box and shielding conduit. vantages of this invention will be readily appre In the prior art shielding assemblies the joint at 50 the opening‘ or outlet in the junction box is formed by causing the sides of the junction box to contact, respectively, with a ?ange at one end of an externally threaded connecter body and 55 with a face of a nut in threaded engagement with said body. Sole reliance for electrical continuity at this'joint is placed upon the contact made by the ?ange and nut with the sides of the junction _ box adjacent the opening therein. As it is gen 80 eral practice to paint junction boxes before in ciated as the same becomes better understood by reference to the following description when considered in connection with the accompanying drawing wherein: Figure 1 is an assembled view in section of my connecter and the joint which one end of the connecter makes with a wall adjacent an open ing therein; Figures 2 and 3 are, respectively, a view in sec 55 :2 2,138,672 tion and a view in end elevation of the female connecter part or member; and Figures 4 and 5 are, respectively, a view in end elevation and a view in section of the nut adapt ed for threaded engagement with the female con necter part. My invention seeks to provide a connecter and a joint between one end thereof and an electri 10 cally conductive element provided with an open ing which are not only electrically continuous but whose resistance is preserved substantially unaltered. To accomplish the foregoing I main tain a direct and intimate metallic contact be 15 20 tween the male and female connecter parts by causing a wedging action between their contact ing surfaces through the medium of a suitable coupling means, the contact or juncture between the connecter parts occurring within the con ?nes of a compressible ?uid impervious means to thus effectively seal the juncture against the connecter exterior. The joint is formed by pro viding the female connecter part at one end thereof with a plurality of projections which are forced into contact with the electrically con ductive element adjacent the opening therein, the area of contact therebetween being sealed against the joint exterior. The joint and connecter of my invention are 30 intended primarily for use with the shielding of aircraft ignition circuits and are so described in their speci?c application hereinafter. It is to be emphasized, however, that the joint and con necter of my invention are not restricted to the aforementioned use but may be used wherever 35 and whenever an electrically continuous joint and connecter are desired. Turning now to the drawing there is shown in Figure l in assembled relation a connecter iden ti?ed in general by the numeral I for connecting together the shielding conduit 2 and apertured wall 3 of a junction box and for permitting the passage of the ignition cable 4 from the conduit into the junction box, the said connecter includ ing a female connecter part 5, a male connecter 45 part 6, a deformable and compressible gasket 1 which serves as a fluid impervious sealing means and is interposed between the connecter parts and a coupling 8 for maintaining a direct and intimate metallic contact between the connecter parts and for causing the connecter parts to com press the gasket ’! whereby to seal the surfaces of contact between the connecter parts against the connecter exterior. i The female and male connecter parts or bodies 55 5 and 6 are apertured at 9 and I 0, respectively, to permit the passage of the ignition cable 4 from the shielding conduit 2 into the junction box. In addition one end of the female con necter part 5 is provided with a conical recessed surface H with which a corresponding conical connecter from adjacent the outermost edges of the conical or inclined surfaces II and I2, these bearing faces being adapted to abut against the sides of the deformable, ?uid impervious gasket ‘l’ interposed therebetween to compress the same Cl and thereby seal the surfaces of contact II and i2 between the connecter parts or bodies 5 and 6 against the connecter exterior. The gasket 1 is preferably, although not necessarily, annular in shape and is placed about and supported by 10 the cylindrical portion l5 of the male connecter part 6. This gasket which serves as a sealing means may be fabricated from synthetic rubber or any other suitable material so long as the material chosen is ?uid impervious, will with stand the weather and be reasonably resistant to ?uids such as, for example, gasoline, oil, and Water. In order to insure a direct and intimate me tallic contact between the contacting surfaces II 20 and I2 of the connecter parts and a compression of the gasket 1, the male and female connecter parts have been provided with a ?ange l6 and screw threads II, respectively, which are adapted to engage a complemental ?ange l6’ and internal 25 screw threads ll’ of a coupling sleeve or nut I. Portions N3 of the coupling sleeve or nut 8 are hexagonally or otherwise shaped to permit the use of a wrench for tightening purposes. The coupling sleeve or nut 8 in addition to holding 30 the contact surfaces H and I2 of the connecter parts in intimate and direct metallic contact and ' ' of the gasket 1, 35 connecter. The male connecter part 6 is recessed or rab beted at l9 to provide inner and outer walls 20 and 2!, respectively, between which the shielding con~ duit 2 is received. Since in this embodiment of 40 can be readily soldered, the male connecter part is attached to its shielding conduit 2 of similar material by sweating the outer wall 2| with solder to the outside of the conduit. The inner wall 20 of the male connecter part 6 in this case serves to support the inside of the shielding conduit 2 and to prevent sharp edges thereof from causing damage to the ignition cable 4. Where, however, the connecter parts are made of an aluminum alloy or metal which cannot be conveniently soldered to a shielding conduit of similar material, I may employ an alternate mode 65 of connection which consists in swaging the outer sleeve 2| inwardly around the shielding surface I2 of the male connecter part 6 is adapted to contact, to thereby insure electrical continuity through the connecter. While the contactingsur faces of the male and female connecter parts are 65 shown as conical in shape, I do not desire to be restricted thereto since other inclined contact surfaces may be employed within the purview of my invention and‘ will readily suggest them selves to those skilled in the art, hemispherical 70 surfaces and pyramidal surfaces being illustra tive but not restrictive of such other inclined surfaces. The female and male connecter parts 5 and 6 are furthermore provided with bearing faces l3 75 and M, respectively, extending outwardly of the engagement between the male connecter part and the shielding conduit. The threaded body portion of the female con necter part 5 is provided at another end there of with a plurality of circumferentially spaced projections, or splines 22 and a ?ange 23, the said projections being forced into the wall 3 of the junction box adjacent the opening therein and being in direct and intimate electrical contact therewith. A ?uid impervious gasket 24 is inter 70 posed between the ?ange 23 and one side of the. wall 3 of the junction box and a second gasket 25 placed adjacent the opening in the wall 3 and on the other side thereof, these gaskets being 3 2,118,672 compressed and held in ?uid impervious engage I claim: ment with the sides of the wall 3 by means of 1. Means for connecting an electrically con a nut 26. Both gaskets are fabricated in a man ductive casing element' to an electrically con ner similar to that of the gasket 1. The nut 26 .ductive element provided with an opening and has a portion of the inner face cut away at 21 for insuring electrical continuity and continuity to provide space for the projections or splines of passage therebetween, comprising in combina and/or the metal they displace, while permitting a tight fit between the inner face of the nut and the ?uid impervious gasket 25 and the use of the 10 connecter regardless of the thickness of the wall or partition 3 through which it passes. A tight ?t between the wall 3 of the junction box, on the one hand, and the gaskets 24 and 25, the ?ange 23 and the nut 26, on the other hand, is essential 15 in order to effectively seal the area of contact between the projections 22 and the junction box wall 3 against the exterior and hence against the, introduction of any extraneous'matter such as, for example, oil and water. It is to be em 20 phasized, however, that the washers or gaskets 24 and 25 need not be employed since a joint 25 30 35 40 which is substantially and effectively sealed against the exterior may be obtained by causing the inner faces of the ?ange 23 and the nut 26 to intimately contact the faces of the wall 3. In use the female connecter part is placed through the opening in the wall 3 of the junction box and the nut 26 threaded thereon and tight ened with or without the interpositioning of gaskets 24 and 25. The tightening of the nut causes the projection 22 to cut into the wall 3 of the junction box adjacent the opening therein and thus to provide a direct and intimate elec trical contact therewith. The tightening of the nut 26 serves also to provide a substantially ?uid impervious juncture between the wall 3, on the one hand, and the ?ange 23 and nut 26, on the other hand, to thereby seal the area of contact between the wall 3 and the projections 22 against the exterior and thereby insure electrical con tinuity at this joint. The nut 8 is now assembled over the male connecter part 6 and the ?uid im pervious gasket ‘I placed about the cylindrical portion l5 of the male connecter part. The fe 45 male connecter part 5 is then brought into place and the parts secured together by tightening the coupling sleeve 8. As the sleeve or nut 8 is tight ened the conical projection on the male con necting part is wedged into the corresponding 50 conical recess of the female connecting part thus providing . direct electrical continuity through the connecter. Simultaneously with the tight ening of the nut or sleeve 8 the sides of the gasket 1 are compressed betwegi the bearing faces l3 and 55 ll of the connecter parts thus sealing within its con?nes the surfaces of contact II and I2 of the connecter parts against the introduction of ex ' traneous materials such as gasoline, oil and moisture. 60 According to the provisions of the patent stat utes I have set forth the principle and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have 65 it understood that within the scope of the ap pended claims the invention may be practiced otherwise than as specifically illustrated andde tion an apertured, electrically conductive body provided with a plurality of spaced projections at one end thereof and a bearing face and in clined, recessed, contact surface at the other end 10 thereof, means for forcing the projections into electrical contact with the electrically conductive element adjacent the opening therein and for sealing the area of contact therebetween against the connecter exterior, a second apertured elec trically conductive body adapted for connection to said casing element and having a contact sur face in electrical contact with that of said ?rst mentioned body and a bearing face, deformable means interposed between the bearing faces of 20 said bodies and adapted to be engaged thereby for sealing the area of contact at the surfaces of said bodies against the connecter exterior, and means for holding said bodies in wedging engage ment at their surfaces of contact and for caus 25 ing the bearing faces to abut against the de formable means interposed therebetween. 2. An electrically continuous shielding assem bly comprising in combination an electrically con ductive casing element, an electrically conduc tive element provided with an opening and means for connecting said elements together and for in suring electrical continuity and continuity of pas sage therebetween, said means including an aper tured, electrically conductive body provided with 35 projecting means at one end thereof and a con tact surface at the other end thereof,‘ means for forcing the projecting means into electrical con tact with the electrically conductive element ad jacent the opening therein and for sealing the 40 area of contact therebetween against the con necter exterior, a second apertured electrically conductive body electrically continuous with said casing element and having a contact surface in contact with that of said ?rst mentioned body, 45 means for sealing the area of contact between said ?rst and second mentioned bodies against the connecter exterior, and means for holding said ?rst and second mentioned bodies in engage ment. 50 3. Means for connecting an electrically con ductive casing element to an electrically con ductive element provided with an opening and for insuring electrical continuity and continuity of passage therebetween, comprising in combination 55 an apertured, electrically conductive body pro vided with projecting means at one end thereof and a contact surface at the other end thereof, means for forcing the projecting means into elec trical contact with the electrically conductive ele 60 ment adjacent the opening therein and for seal~= ing the area of contact therebetween against the connecter exterior, a second apertured electri cally conductive body adapted for connection to said casing element and having a contact sur 65 face in contact with that of said first mentioned body, means for sealing the area of contact be tween said ?rst and second mentioned bodies This invention may be manufactured and used v against the connecter exterior, and means for .70 by or for the Government of the United States holding said first and second mentioned bodies in 70 of America for governmental purposes without engagement. scribed. > ‘ payment of royalties thereon-or therefor. . THOMAS C. GREEN.