US3108843A

US3108843A - Electrical jack

Info

Publication number: US3108843A
Application number: US79833A
Authority: US
Inventors: Frantz Nicholas
Original assignee: CARTER PARTS CO
Current assignee: CARTER PARTS CO
Priority date: 1960-12-30
Filing date: 1960-12-30
Publication date: 1963-10-29
Anticipated expiration: 1980-10-29

Description

Oct. 29, 1963 N. FRANTZ 8,

ELECTRICAL JACK Filed Dec. 30, 1960 2 Sheets-Sheet 1 ELETJ- JNVENTbR.

NICHOLAS FRANTZ BY OLSEN mo STEPHEN SON ATTORIIEY8 Oct. 29, 1963 N. FRANTZ ELECTRICAL JACK Filed Dec. 30, 1960 2 Sheets-Sheet 2 Eli-E5 I52 92 fill-Il- Q 422 9 A l2 ru-sz Q ml 1 s2 Q Q .44 m as 36 Y 1 V 6 56 4 e 66 I46 iflli;

-l22 a Q I42 4 a4 3 I60 I48 [MENTOR NICHOLAS FRANTZ BY OLSEN AND STEPHENSON xrwoauevs United States Patent ELEQTREQAL E i-EEK Nicholas Frantz, Chicago, ill, assignor to Carter Parts Company, Skokie, ilk, a corporation of lllineis Filed Dec. 39, 1960, Ser. No, 79,333 11 Claims. (Cl. 339-l3d) This invention relates generally to electrical jacks and more particularly to an improved jack WJlCll is completely insulated from the panel in which it is mounted without the requirement of any additional insulating washers, bushings, or the like.

An electrical jack of the type to which this invention relates includes a mounting sleeve which is externally threaded and is adapted to be inserted through an opening in a supporting panel and then clamped to the panel by a nut threaded onto the sleeve. A plug can then be inserted through the sleeve so that it projects into contact with one or more spring contact elements supported from the sleeve. In a jack in which the mounting sleeve is formed of metal, which is customarily the case, it functions as a conductor in the electrical circuit associated with the jack. Usually, the sleeve is in electrical contact with the plug and is connected to a grounded conductor so as to effectively ground the plug. As a result of this arrangement, insulating bushings and/or washers are required when mounting each jack in the panel to electrically insulate the mounting sleeves on the panel from each other. It is an object of the present invention, therefore, to provide an electrical jack in which the mounting sleeve is formed of a dielectrical material thereby eliminating the necessity for additional insulating washers and bushings when installing the jack, and in which an additional terminal that makes contact with an inserted plug is provided, thereby making the same circuit possible that is possible with a jack having a metal sleeve.

Another object of this invention is to provide a twin jack assembly in which either or both of the jack sleeves are formed of a dielectric-a1 material.

A further object of this invention is to provide an electrical jack which is simple in construction and economical to manufacture.

Further objects, features and advantages will become apparent from a consideration of the following description, the appended claims and the accompanying drawing in which:

FEGURE l is a longitudinal sectional view of the jack of this invention;

FIGURE 2 is an elevational view of one end of the jack shown in FIGURE 1;

FIGURE 3 is a longitudinal sectional view of the jack shown in FIGURE 1 looking substantially along the line 33 in FIGURE 1;

FIGURE 4 is a fragmentary transverse sectional View of the jack of this invention looking substantially along the line 44 in FIGURE 1 with a portion of the mounting plate broken away for the purpose of clarity;

FIGURE 5 is a diagrammatic view of the circuit obtained with the jack of FIGURE 1;

FIGURE 6 is a transverse sectional view of the jack of this invention looking substantially along the line 66 in FIGURE 1;

FLGURE 7 is an end view of a twin jack assembly of this invention, with a portion of the mounting plate therefor broken away for the purpose of clarity;

FIGURE 8 is a longitudinal sectional view of the twin jack assembly of this invention, looking substantially along the line 8-8 in FIGURE 7;

FIGURE 9 is a longitudinal sectional view of the twin jack assembly of this invention, looking substantially along the line 9-9 in FIGURE 7;

FIGURE 10 is an elevational view of one end of the twin jack assembly of this invetnion; and

FIGURE 11 is a diagrammatic view of a circuit obtainable with the twin jack assembly of this invention.

With reference to the drawing, the jack of this invention, indicated generally at ill, is illustrated in FIGURES 1 and 3 as including an insulator body 12, formed of a dielectrical material, having an annularly shaped portion 14 adjacent one end 3.6 and an elongated plate shape portion 18 integral with the portion 14 and extending to the opposite end 2d of the body 12. An opening 22; extends axially through the end portion 14, which has an axis 24, and is of an enlarged diameter adjacent the end 16 of the body 12 so as to form an annular shoulder 26 on the inner surface of the portion 14 intermediate the ends thereof. A pair of cavities 23 and 25 are formed in the portion 14 on opposite sides of the opening 22. Each of the cavities 2-3 and 2 5 is of an irregular shape, having narrow side portions 27 and communicates with the axial opening 22. (PEG. 2). Since the opening 22 extends entirely through the portion 14, the body 12 is in effect hollow having a side wall 19 and an open end 16. On its outer side, the body portion 14 is provided with a pair of diametrically opposite side projections 23 which terminate intermediate the ends of the portion 14 in inwardly inclined surfaces 3%.

Three

spring contact elements

32, 354 and 36, formed from flat spring material, and hereinafter referred to as the tip spring, make-break spring and make spring ele ments, respectively, are mounted on the insulator body 12. The tip spring element 32 is of a generally U-shape having a base portion 38 positioned in a notch 40 in the end 16 of the body 12 so that it extends across the side wall 19, an outer apertured leg 42 adapted to be connected to a conductor, and an inner irregularly shaped leg portion 44- which extends inwardly of the body 12 through the cavity 25 and is confined in the narrow cavity side portions 27. The leg portion 44 has a reversely curved end 4 6 which faces the axis of the body 12 and is engageable with the tip of a plug (not shown) when it is inserted in the jack ill.

The make-break element 34 is likewise of a U-shape having a base portion 48 positioned in a notch 50 in the end of the body 12, an outer apertured leg portion 52 adapted to be connected to a conductor, and an inner leg portion 54 which extends inwardly of the body 12, through the cavity 23 and is confined in the narrow cavity side portions 27. Intermediate its ends, the leg portion 54- carries a litter 54, formed of a dielectrical material, positioned substantially opposite the end 46 of the tip spring 32. The make spring 36 is substantially L-shape haying a first apertured leg portion 6%) adapted to be connected to a conductor and a second leg portion 62 which is substantially perpendicular to the first leg portion oil. The first leg portion till is positioned in a groove @4- in one side of an insulator bar 66 positioned against the outer side of the body plate portion 18. The insulator bar 66 has end portions 68 which engage opposite edges of the plate portion 18 to prevent relative movement between the bar 66 and the body 12 and the location of the leg portion fill in the groove 64 prevents relative movement of the make spring 36 and the insulator bar 66. A rivet connector 7% extends through the body portion 1%, the bar 66, and the make spring leg portion 60 for attaching the bar 66 and the make spring 36 to the body 12. In the illustrated form of the jack ill, the leg portion 62 of the make spring 36 is normally spaced from the end '72 of the make-break spring 34, but is close enough to the end 72 to be engaged thereby when a plug (not shown) is inserted in the jack 10 so as to engage the lifter 56 and move the spring 34.

oneness An insulator washer 78 is positioned against the end to of the body '12 so as to maintain the elements and 32 in their assembled positions on the body 12. The washer 73 has an axial opening which is axially aligned with the opening 2 in the body 32.

An insulator sleeve 82, of generally tubular shape, and formed of a dielectrical material, is provided intermediate its ends with a radially outwardly extending flange or projection 86 which is substantially cir ular (FIG. 6) having a flat face 38 on one side which is formed with a radially extending groove 9%. The opposite face of the flange 86 is formed with a concentric boss or extension 92 which is illustrated as being substantially hexagonal and in any case is of a non-circular shape for a purpose to appear presently. A tubular portion 94 of the sleeve 82 on one side of the ilange $6 is formed with external threads 96. The portion 98 of the sleeve 12 on the opposite side of the flange 36 is unthreaded and is of a diameter to telescope within this opening 22 in the body 12 to a position in which it is adiacent the shoulder 26. The portion98 is formed with a longitudinally extending slot 1% which extends the full length thereof and is aligned with the groove 96 in a direction longitudinally of the sleeve 82. The inner surface of the sleeve 82 is generally cylindrical and is formed with a longitudinally extending groove 1 34 which extends from a point in radial alignment with the flange face 88 to a point short of the outer end 1% of the sleeve 82. The groove 164i is longitudinally aligned with the slot 1% so that it is also in longitudinal alignment with the groove 95- and communicates with the groove Q9.

The body 12 is secured to the insulator sleeve 82 by a clamp member which includes a plate portion llil formed with an opening 112 of a size slightly larger than the external diameter of the sleeve portion 9'4 so that the sleeve portion can be extended through the opening 112 to a position in which the flange as engages the plate portion 11%. In this position of the clamp member 16%, the hexagonal boss 92 on the flange 86 projects into a similarly shaped cavity 114 formed in the clamp plate portion 113 by offsetting or embossing a section 116 thereof. By forming the boss 92 and the cavity 114 of nesting noncircular shapes relative rotation of sleeve 82 and clamp member ms is positively prevented. The clamp res also includes a pair of clamping fingers 118 formed integral with one side of the plate portion 119 and a single clamp finger 121? formed integral with the opposite side of the plate portion 110. As shown in FIGURE 3, the

fingers

118 and 120 extend along the sides of the body member projections 23 and are bent inwardly so that they engage the inclined surfaces 36 on the projections 23, so that the clamp member 108 functions to mount the washer 78 and body 12 on the sleeve 82 in positions in which the

spring contact elements

32, 34 and 3e are held in the positions shown in FIGURE 1. A terminal 121 is formed integral with the plate portion 1113 and is provided with an aperture 1-23 so that it can readily be connected to a ground conductor.

Tie jack It also includes a sleeve terminal 122, formed from a fiat spring material, which is of a shape such that it has a pair of inner and

outer leg portions

124 and 126, respectively, and a connecting portion 128 extended between the leg portions 1% and 126. The connecting portion 123 is positioned in the slot as in tie sleeve flange 86 so that it projects radially through the sleeve 82. The groove 98 is preferably slightly shallower than the thickness of the terminal portion 128 so that the terminal is securely clamped between sleeve flange 85 and Washer 78. The leg portion 124 is positioned in the groove M4 in the sleeve 82 and is bowed intermediate its ends so that it projects radially inwardly or" the gen erally cylindrical internal surface of the sleeve 32. The leg port-ion 126 is apertured and extends outwardly of the jack It for connection to a conductor.

In the use of the jack 16 the externally threaded sleeve A} portion 96 is pr jected through an opening in a mounting panel so that the clamp plate portion Hll engages one side of the panel. A nut (not shown) is then threaded onto the sleeve portion 96 so that it engages the opposite ide of the panel and secures the jack 14)- to the panel. A jack plug (not shown) of conventional type then be inserted in the sleeve 32 so that it projects into the body 12. The construction of the sleeve -82 so that the portion g g thereof telescopes into the body 12 insures a coaxial assembly of these parts and in addition provides in effect, an extra length sleeve to insure a perfect alignment thereof with the plug. The sleeve portion fi is of a length such that clearance exists between it and the shoulder 25 so that the washer 78 is tightly clamped between the flange 36 and the end 16 of the body l2.

When the jack is inserted, the shank of the pack is in contact engagement with the sleeve terminal 122 and the bowed shape of the leg portion 124 provides the desired contact pressure. The tip of the jack extends into the body 12 for contact engagement with the end 48 of the tip spring 32 and engages the lifter 56 on the makebreak spring 54 so as to move the end '72 thereof against the leg portion 62 of the make spring 36. As shown in FiGURE 5, this provides for a connection of the spring elements and The tip of the jack engages the terminal 32 while the shank of the jack, which is insulated from the tip, engages the terminal 122 in the sleeve 82;

These terminals are connected to the circuit to obtain the desired results when the plug is inserted in the jack 10.

A twin jack assembly Illa is illustrated in FIGURES 7-11, inclusive, in which the insulating sleeve features of the jack ll are included. The twin jack assembly lilo consists of a pair of jacks 14a and 142 each of which includes a body 12,

spring contact elements

32, 34 and 3s, a washer '73 and a sleeve terminal 122, identical to corresponding parts of the jack it The same numerals are used, therefore, on the jacks and 142 to indicate the same parts identified by these numerals on the jack 1%. The sleeves 144- and 146m the

jacks

140 and 142, respectively, are also identical in shape to the sleeve 82 in the jack It) and may both be formed of a dielectrical material or, if desired, only the sleeve 144 may be formed of the dielectrical material and the sleeve 1% may be formed of metal. In either event, the jacks Mil and 142 are insulated from each other by virtue of the sleeve 144 being formed of the dielectrical material.

In the assembly of the twin jack assembly lilo, the jacks 14 3 and 142 are arranged side by side as shown in PEGURES 7 and 9 and a single clamp member 148 is utilized to both mount the insulator bodies 12 on their mounting sleeves 1 54 and 146 and to connect the jacks Hail and 142 so that they may be handled as a single unit.

The clamp member 148 includes a plate portion 159 which is formed with a pair of axially oft-set or embossed sections 352, each of which is of a hexagonal shape and forms a cavity 154 in one side of the plate portion 15% which is of a size such that the hexagonal projection 92 on a

sleeve member

144 or 146 can be fitted therein. The plate portion 15s is formed with a pair of side by side openings 156 ('FIG. 7) of a size such that the sleeves 14 i and 146 can be projected thercthrough to positions in which the sleeve projections 92 are fitted within the hexagonal cavities 154 in the plate portion 152'). At positions surrounding the off-set sections 152 ends of the innermost side projections 28 on the bodies 12 and has integral clamp fingers 162 which extend forwardly through slots 16d in the clamp plate portion and are then bent into engagement with the front side of the plate portion 159. The clamp 14-8 and the clamping strip 169 thus cooperate to securely mount the bodies 12 on the mounting sleeves 14d and 1% in positions maintaining the

contact elements

32, 34 and 3d and the sleeve terminals 122 in predetermined desired positions. The assembly 1611 is readily mounted on a mounting plate by projecting the sleeves 144 and 145 through openings in the mounting plate and then advancing nuts (not shown) onto the sleeves 1 .4 and 146 so as to secure the jack assembly liia to the mounting plate.

In the use of the twin jack assembly 19a, the usual plugs can be inserted in the sleeves 14d and 145 so as to provide a circuit such as the one shown in FIGURE 11. Whenever a plug is inserted into either of the sleeves 144 or 14-6, the shank of the plug is connected to the terminal 1-22, the tip of the plug engages the tip spring element 32, which is insulated from the make-break spring element 34 by the dielectric lifter S6, and the element 34 is moved into contact engagement with the make spring contact element 36. A terminal "161 on the clamp 14% is provided for grounding the clamp.

It will be understood that the specific construction of the improved electrical jacks which are herein disclosed and described are presented for purposes of explanation and illustration and are not intended to indicate limits of the invention, the scope of which is defined by the following claims.

I claim:

1. An electrical jack comprising a hollow insulator body having a pair of ends, a support sleeve for said body arranged at and projected into one end thereof, said sleeve being formed of a dielectFi-cal material and having radially extending projection means adjacent the end thereof adjacent said body, means securing said projection means to said body so that said projection means is urged toward said one end of said body, contact means mounted on said body for engagement 'witha mating plug inserted in said sleeve and body, and a sleeve terminal extending longitudinally into said sleeve for contact engagement with a plug inserted therein and extending out of said sleeve at a position between said projection means and said one end of said body in an insulated relation with said contact means and in a direction substantially transversely of said one end of said body.

2. An electrical jack comprising a hollow insulator body having a pair of ends, a support sleeve for said body arranged at and projected into one end thereof, said sleeve being formed of a dielectrical material and having radially extending projection means adjacent the end thereof adjacent said body, said sleeve having a generally cylindrical inner surface formed with a groove extending longitudinally of said sleeve, means securing said projection means to said body so that said projection means is urged toward said one end of said body, contact means mounted on said body for engagement with a mating plug inserted in said sleeve and body, and a sleeve terminal having a first portion positioned in said groove and projecting radially inwardly of said inner surface, said sleeve terminal having a second portion extending substantially radially outwardly of said sleeve at a position between said projection means and said one end of said body in an insulated relation with said contact means and in a direction substantially transversely of said one end of said body.

3. An electrical jack comprising a hollow insulator body having a pair of ends, a support sleeve for said body arranged at one end thereof, said sleeve being formed of a dielectrical material and having radially extending projection means adjacent the end thereof adjacent said body, clamps means securing said projection means to said body so as to urge said projection means and body toward each other, a contact element mounted on said one end of said body and projected into said body for engagement with a mating plug inserted in said sleeve and body, an insulator washer arranged at said one end of said body at a posi tion between said projection means and said body so as to retain said contact element on said body, and a sleeve terminal having a leg portion extending longitudinally into said sleeve for contact engagement with a mating plug inserted therein and a connecting portion extending substantially radially out of said sleeve at a position clamped between said washer and said projection means in an insulated relation with said contact element.

4, An electrical jack comprising a hollow insulator body having a pair of ends and an axis, a support sleeve for said body arranged at and projected into one end thereof, said sleeve being formed of a dielectrical material and having radially extending projection means adjacent the end thereof adjacent said body, said projection means having a groove formed in the side thereof adjacent said body extending from the outer edge thereof to the inner surface of said sleeve, clamp means securing said projection means to said body so as to urge said projection means and body toward each other, a contact element mounted on said one end of said body and projected into said body for engagement with a mating plug inserted in said sleeve and body, an insulating washer disposed between and engaged with said projection means and said contact element and a sleeve terminal extending longitudinally into said sleeve from said end thereof for contact engagement with a mating plug inserted therein and extending substantially radially out of said sleeve through said groove at a position between said projection means and said washer in an insulated relation with said contact element.

5. An electrical jack comprising a hollow insulator.

body having a side wall and an open end, at least one spring contact element mounted on said body so that it extends across said side wall at said open end and projects into said body, an insulator Washer positioned at said open end and having one side thereof engaged with said open end of said housing so as to retain said contact element in a mounted position on said body, an externally threaded mounting sleeve formed of a dielectrical material and provided adjacent one end with a flange which extends transversely outwardly thereof, said sleeve at said one end thereof extending through said washer into said body to a position in which one side of said flange is engageable with the opposite side of said washer, said sleeve having a generally cylindrical inner surface and being provided with a groove in said surface which extends longitudinally of said sleeve in a direction from said flange toward the opposite end of said sleeve member, a sleeve terminal having a first portion positioned in said sleeve groove and projecting inwardly of said sleeve inner sur face and a second portion extending outwardly of said sleeve, and means securing said body to said sleeve.

6. An electrical jack comprising a hollow insulator body having a side wall and an open end, at least one spring contact element mounted on said body so that it extends across said side wall at said open end and projects into said body, an insulator Washer positioned at said open end and having one side thereof engaged with said open end of said housing so as to retain said contact element in a mounted position on said body, an externally threaded mounting sleeve formed of a dielectrical material and provided adjamnt one end with a flange which extends transversely outwardly thereof, said sleeve at said one end thereof extending through said washer into said body to a position in which one side of said flange is engageable with the opposite side of said washer, said sleeve having a generally cylindrical inner surface and being provided with a groove in said surface which extends longitudinally of said sleeve in a direction from said flange toward the opposite end of said sleeve member, a sleeve terminal having a first portion positioned in said sleeve groove and projecting inwardly of said sleeve inner surface and a oneness second portion extending outwardly of said sleeve between said flange and washer, and means engaging said flange and said body for attaching said body to said flange.

7. An electrical jack comprising a hollow insulator body having a side wall and an opening at one end thereof, at least one spring contact element mounted on said body so that it extends across said side wall at said open end and projects into said bod an insulator wast er positioned at said open end and having one side thereof engaged with said open end of'said housing so as to retain said contact element in a mounted position on said body, an externally threaded mounting sleeve formed of a dielectrical material and provided adjacent one end with a flange which extends transversely outwardly thereof, said sleeve at said one end thereof extending through said washer and telescoping into said body opening to a position in which one side of said flange is engageable with the opposite side of said washer, a non-circular projection on the opposite side of said flange concentric with said sleeve, said sleeve having a generally cylindrical inner surface, a sleeve terminalhaving a first portion positioned in said sleeve and projecting inwardly of said sleeve inner surface and a second portion extending outwardly of said sleeve, a clamp member having an opening through which said sleeve extends and having a cavity in one side thereof concentric with said opening and of a size and shape to have said flange projection teiescoped therein, and means on said clamp member engaged with said body for clamping said sleeve to said body so that a mating plug positioned in said sleeve and extending into said body will engage said sleeve terminal and said spring contact element.

8. An electrical jack comprising a hollow insulator body having a side wall and an open end, said body having projections on opposite sides thereof terminating in end surfaces disposed intermediate the ends of said body, an insulator washer positioned at said open end and having one side thereof engaged with said open end of said housing, at least one spring contact element mounted on said body so that it extends across said side wall between said open end and said one side of said washer and projects into said bod an externally threaded mounting sleeve formed of a dielectrical material and provided adjacent one end with a flange which extends transversely outwardly thereof, said sleeve at said one end thereof extending through said washer into said body to a position in which one side of said flange is engageable with the opposite side of said washer, said sleeve having a generally cylindrical inner surface and being provided with a groove in said surface which extends longitudinally of said sleeve in a direction from said flange toward the opposite end of said sleeve member, said flange having a groove in said one side thereof which intersects said sleeve groove, a sleeve terminal having a first portion positioned in said sleeve groove and projecting inwardly of said sleeve inner surface and a second portion positioned in said flange groove and extending outwardly of said sleeve, and a clamp member extending at least partially about said sleeve member and having one portion engaged with the opposite side of said flange and another portion engaged with said end surfaces on said body projections for clamping said sleeve to said body so that a mating plug positioned in said sleeve and extending into said body will engage said sleeve terminal and said spring contact element.

9. A twin electrical jack assembly comprising a pair of side by side hollow insulator bodies each of which has an open end, at least one spring contact element mounted on each of said bodies, a mounting sleeve for each of said bodies, at least one of said mounting sleeves being formed of a dielectrical material, said mounting sleeves being positioned at the open end of their respective insulator bodies, each of said mounting sleeves having a substantially cylindrical internal surface, a pair of sleeve terminals corresponding to said mounting sleeves, each of said terminals extending into its corresponding mounting sleeve projecting mwardly from the internal surface thereof, each of said sleeve terminals extending out of the sleeve therefor in a direction substantially radially thereof in an insulated relation with the spring contact element mounted on the adjacent body, and one piece clam-p means engaged with said mounting sleeves and said bodies for clamping said sleeves to said bodies, for clamping said sleeve terminal to said mounting sleeves, and for maintaining said bodies in said side-by side relation.

19. An electrical jack comprising a hollow insulator body savin a side wall and an open end, an insulator washer positioned at said open end and having one side thereof engaged with said open end of said housing at least one spring contact element mounted on said body so that it extends across said side wall between said open end and said one side of said washer and projects into said body, an externally threaded mounting sleeve formed of a dieiectrical material and provided adjacent one end with a flange which extends transversely outwardly thereof, said sleeve at said one end thereof extending through said washer into said body to a position in which one side of said flange is engageable with the opposite side of said washer, said sleeve having a generally cylindrical inner surface and being provided with a groove in said surface which extends longitudinally of said sleeve in a direction fro-m said flange toward the opposite end of said sleeve member, said flange having a groove in said one side thereof which intersects said sleeve groove, a sleeve terminal having a first portion positioned in said sleeve and extending outwardly of said sleeve, and a clamp member extending at least partially about said sleeve member and having one portion engaged with the opposite side of said llange and another portion engaged with said body for clamping said sleeve to said body so that a mating plug positioned in said sleeve and extending into said body will engage said sleeve terminal and said spring contact element.

11. A twin electrical jack assembly comprising a pair of side by side hollow insulator bodies each of which has an open end, at least one spring contact element mounted on each of said bodies, a mounting sleeve for each of said bodies, each mounting sleeve being formed of a dielectriinsulator body, each of said mounting sleeves having a substantially cylindrical internal surface and a flange adjacent one end extending radially outwardly therefrom, a non-circular projection on one side of each of said flanges arranged in a substantially concentric relation with said sleeve, a sleeve terminal extending into each of said mounting sleeves and projecting inwardly from said internal surface thereof, each of said sleeve terminals extending out of the sleeve therefor in an insulated relation with the spring contact element mounted on the adjacent body, and means including a clamp member engaged with said mounting sleeves and said bodies for clamping said sleeves to said bodies, said clamp mermber having a pair of side by side openings therein adapted to have said sleeves projected therethrough, means on said clamp member forming cavities in one side thereof substantially concentric with said openingsand of a size and shape to have said projections telescoped therein when said sleeves project through said openings.

References Cited in the file of this patent UNITED STATES PATENTS groove and projecting inwardly of said sleeve inner sun face and a second portion positioned in said flange groove cal material and being positioned at the open end of its 7 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3., 108 843 October 29, 1963 Nicholas Frantz It is hereby certified that error appears in the above numbered patent requiring correction and that th e said Letters Patent should read as corrected below.

Column 2,, line 2, for "invetnion" read invention column 4 line 17 for "pack" read jack line 75, strike out "inner", secon d occurrence; column 5, line l strike out "ends of the"; column 7, line 71, for "end" read ends Signed and sealed this 5th day of May 1964.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer Commissioner of Patents

Claims

1. AN ELECTRICAL JACK COMPRISING A HOLLOW INSULATOR BODY HAVING A PAIR OF ENDS, A SUPPORT SLEEVE FOR SAID BODY ARRANGED AT AND PROJECTED INTO ONE END THEREOF, SAID SLEEVE BEING FORMED OF A DIELECTRICAL MATERIAL AND HAVING RADIALLY EXTENDING PROJECTION MEANS ADJACENT THE END THEREOF ADJACENT SAID BODY, MEANS SECURING SAID PROJECTION MEANS TO SAID BODY SO THAT SAID PROJECTION MEANS IS URGED TOWARD SAID ONE END OF SAID BODY, CONTACT MEANS MOUNTED ON SAID BODY FOR ENGAGEMENT WITH A MATING PLUG INSERTED IN SAID SLEEVE AND BODY, AND SLEEVE TERMINAL EXTENDING LONGITUDINALLY INTO SAID SLEEVE FOR CONTACT ENGAGEMENT WITH A PLUG INSERTED THEREIN AND EXTENDING OUT OF SAID SLEEVE AT A POSITION BETWEEN SAID PROJECTION MEANS AND SAID ONE END OF SAID BODY IN AN INSULATED RELATION WITH SAID CONTACT MEANS AND IN A DIRECTION SUBSTANTIALLY TRANSVERSELY OF SAID ONE END OF SAID BODY.