US2681439A - Insulated electrical connector - Google Patents
Insulated electrical connector Download PDFInfo
- Publication number
- US2681439A US2681439A US100148A US10014849A US2681439A US 2681439 A US2681439 A US 2681439A US 100148 A US100148 A US 100148A US 10014849 A US10014849 A US 10014849A US 2681439 A US2681439 A US 2681439A
- Authority
- US
- United States
- Prior art keywords
- ferrule
- sleeve
- insulation
- plastic
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
- H01R4/20—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
Definitions
- This invention relates to an electrical connectorand more particularly to electrical connec tors having tough malleable insulation permanently secured on the po tion which is connected to a wire and capable of transmitting radial pressure suiiicient for forging an inner metal portion of the connector to the central conductor of "the wire.
- the present invention is an improvement on the insulated terminals of the type set forth in the patent of William S. Watts, No. 2,410,321 and on the copending application of Robert C. Swengel,
- the portion of the sleeve which extends beyond the smaller connector fer- ,rule is required to have substantially larger diameter than the ferrule portion which engages the bare end of the conductor wire and consequently the plastic tubing has to be substantially stretched in this larger insulation receiving por tion.
- Ordinary tubing when thus applied has a greater portion of plasticizer, in order to facilitate manufacturing operations, than can properly be tolerated during the crimping of a connector onto a wire. After assembly, therefore, the plastic is subjected to a leaching or baking operation to remove the excess plasticizer. During this operation the plastic shrinks severely.
- Figure 2 I have shown in side elevation a metal sleeve covered with a plastic sleeve formed from extruded plastic tubing after shrinking onto the metal, and Figure 3 shows an end view taken from the outer or open end of the sleeve of Figure 2.
- the ring-tongue terminal body it! includes a metal ferrule 12 which is shown in broken lines and having central bore 14, also shown in broken lines, for reception of the-bared end of the central conductor of an insulated wire.
- the outer end of the composite cover is enlarged as shown to a substantially greater diameter to receive and fit over the outside of an insulated portion of the wire. Both the insulation portion and the ferrule portion having smaller bore it are eventually pressure-forged together and together with a wire so as to form a secure and substantially perfect electrical connection.
- Figure 2 shows the plastic sleeve 29 and the metal sleeve i8 in an intermediate stage of its manufacture. As shown the length of plastic tubing has been stretched and pushed over the metal sleeve with a substantial length projecting beyond the larger end of the metal sleeve l8.
- the insulated composite cover has then been subjected to a baking operation at a temperature and for a time sufiicient to remove excess plastic- 3 is then further treated by pressing into itua round-nosed punch adapted to substantially fit the inside of the larger end of thesleeveas shown in Figure 1.
- This punch may becold, but is preferably heated to a temperature at which the plastic is substantially softened.
- the resulting structure has the primary advantage or insulating the end of the metal portions of the connector so as to give a desired creepage distance .or sparkover path.
- it has the further advantage that when the enlarged portion 18-20 is crimped onto an insulated wire, the iii-turned plastic tube is molded into the insulation on the wireand the insulation is forced up over its inner edge so as to give a stronger and more secure engagement than in the case of a straight plastic sleeve not in-turned in this manner.
- an electrical connector of the type .comprisferrule onto a wire which is characterized by an end of the plastic sleeve being folded back into the end of the metal ferrule, said sleeve insulating the outer end of said ferrule inside and outside completely around its periphery and for a substantial distance from said periphery baclc' along the inside and outside of said ferrule, said sleeve end being at least semirigid and strongly resistant to collapse or compression by forces applied thereto along lines parallel to the axis of the sleeve and ferrule whereby when said sleeve and ferrule ends have been compacted upon an end portion of an insulation sheath on a wire said sleeve end cannot readily be slipped bodilyoutof said ferrule end.
- An electrical connector of the type comprisingla metal ferrule and a covering sleeve of tough, malleable plastic material capable of transmitting sufiicient radial pressure for cold forging the ferrule onto a wire, which is characterized by an end of the plastic sleeve being folded back into the end of the metal ferrule; fitting closely in said metal ferrule and having elastic memory of a smaller circumference, said sleeve insulating the outer end of said ferrule inside and outside completely around its periphery and for a substantial distance from said periphery back along the .inside and outside of said ferrule, said sleeve end being at least semirigid and strongly resistant to collapse or compression by forces applied thereto along lines parallel to the axis of the sleeve and ferrule whereby when said sleeve and ferrule ends have, been compacted upon an end portion of an insulation sheath .on a wire said sleeve send cannot readily be slipped bodily out of
- An electrical connector having a metal ferrule portion adapted to receive the stripped end of the central conductor of an insulated wire, an insulation support portion of greater internal diameter than the first-named ferrule portion and extending beyond'said ferrule portion to receive the insulation on said wire, and a tube of touglr' malleable plastic covering the exterior and the end of said insulation support portion and extending back for a substantial distance entirely throughout its periphery in intimate contact with both the inner and outer walls of said insulation support, said tube being at least semirigid and strongly resistant to forces of compression applied thereto along lines parallel to the axis of the connector whereby when said insulation sup port portion is compressed upon an insulation sheath on a wire the portion of said tube between said insulation support portion and such insulation sheath cannot readily he slipped bodily out of said insulation support portion.
- An electrical connector having a metal ferrule portion adapted to be cold forged into electrical contact with the center conductor of an insulated wire, a metal insulation supporting portion secured to and extending from said.f.er rule portion and adapted to surround and be cold forged into gripping relationship with the insulation covering of said wire, and a continuous integral tube of deformable insulating material circumferentially covering and being in intimate contact with the outer surface, one end,
- said insulating tube bein of such tough malleable material as to transmit the radial pressure by which said insulation supporting portion is cold forged onto the insulation covering 'of said wire said tube being at least semirigid and strongly resistant to forces of compression applied thereto along lines parallel to the ax'isof the connector whereby when said tube and supporting portion are compressed upon an end portion of the insulation covering on the wire the end of the tube cannot readily be pulled bodily out of the interior of said insulation supporting portion.
Landscapes
- Connector Housings Or Holding Contact Members (AREA)
Description
June 15, 1954 v, E. CARLSON INSULATED ELECTRICAL CONNECTOR Filed Jun 20, 1949 I N VEN TOR.
Patented June 15, 1954 OFFICE INSULATED ELECTRICAL CONNECT-R Vernon E. Carlson, Camp Hill, Pa., assignor to Aircraft Marine Products Inc., Harrisburg, Pa.
Application June 20, 1949, Serial No. 100,148
Claims.
This invention relates to an electrical connectorand more particularly to electrical connec tors having tough malleable insulation permanently secured on the po tion which is connected to a wire and capable of transmitting radial pressure suiiicient for forging an inner metal portion of the connector to the central conductor of "the wire.
The present invention is an improvement on the insulated terminals of the type set forth in the patent of William S. Watts, No. 2,410,321 and on the copending application of Robert C. Swengel,
thin metal ferrule which when applied onto the connector is to become a part of the ferrule. In cases where insulated wires with relatively thick insulation are to be used the portion of the sleeve which extends beyond the smaller connector fer- ,rule is required to have substantially larger diameter than the ferrule portion which engages the bare end of the conductor wire and consequently the plastic tubing has to be substantially stretched in this larger insulation receiving por tion. Ordinary tubing when thus applied has a greater portion of plasticizer, in order to facilitate manufacturing operations, than can properly be tolerated during the crimping of a connector onto a wire. After assembly, therefore, the plastic is subjected to a leaching or baking operation to remove the excess plasticizer. During this operation the plastic shrinks severely. Insofar as it is supported on a metal ferrule this shrinking mere- ,ly gives it a tight engagement with the metal ferrule portions of the connector, but any part of the plastic sleeve which extends beyond the metal portion and which may have been substantially stretched may be so severely shrunken in this operation as to block off the mouth of the connector against proper entrance of the insulated portion of the wire. This has put a limit 'on' the permissible extension of the plastic beyond the end of the metal sleeve or ferrule especially where the sleeve has had to be severely stretched to accommodate the insulation, and this in turn has prevented the use of this type of connector in certain applications where a relatively long sparkover distance or creepage distance is required between the outermost metal part and the nearest point on the exterior of the insulation.
Accordingly it is an object of the present invention to overcome the difficulties described above and to meet the requirements of such uses for a relatively long creepage distance or sparkover path. This I have accomplished according to the present invention by making a relatively long extension of the plastic material beyond the supporting metal sleeve. The long extension as set forth above tends to close in across the mouth of the terminal when it is subjected to steps for removal of excess plasticizer. After that treatment, however, I have now found that it is possible, even in the condition in which the plastic is left, to force the projecting portion of the insulation inwardly so that it is inverted into the ferrule inside of the metal and then to expand it radially so that it fits against the mouth.
This I accomplished advantageously by means of a round-nosed punch as set forth more in detail hereinafter.
In the accompanying drawings I have shown, Figure l, in plan View a standard ring-tongue connector terminal embodying the present invention.
In Figure 2 I have shown in side elevation a metal sleeve covered with a plastic sleeve formed from extruded plastic tubing after shrinking onto the metal, and Figure 3 shows an end view taken from the outer or open end of the sleeve of Figure 2.
Referring to these drawings, the ring-tongue terminal body it! includes a metal ferrule 12 which is shown in broken lines and having central bore 14, also shown in broken lines, for reception of the-bared end of the central conductor of an insulated wire.
Onto the exterior ferrule I2 has been fitted a composite cover It composed of an inner thin .metal ferrule is, shown in broken lines, and
exterior plastic sleeve 21]. The outer end of the composite cover is enlarged as shown to a substantially greater diameter to receive and fit over the outside of an insulated portion of the wire. Both the insulation portion and the ferrule portion having smaller bore it are eventually pressure-forged together and together with a wire so as to form a secure and substantially perfect electrical connection.
As shown in broken lines at the left-hand end of Figure L'the end 22 of the plastic sleeve 20 has been inverted into the open end of the thin metal ferrule portion is thus covering the latter and insulating it for a substantial distance.
Figure 2 shows the plastic sleeve 29 and the metal sleeve i8 in an intermediate stage of its manufacture. As shown the length of plastic tubing has been stretched and pushed over the metal sleeve with a substantial length projecting beyond the larger end of the metal sleeve l8.
The insulated composite cover has then been subjected to a baking operation at a temperature and for a time sufiicient to remove excess plastic- 3 is then further treated by pressing into itua round-nosed punch adapted to substantially fit the inside of the larger end of thesleeveas shown in Figure 1. This punch may becold, but is preferably heated to a temperature at which the plastic is substantially softened. By this means the extended end 22 of the plastic sleeve as-shown in Figures 2 and 3 is inverted and expanded to its position as shown in Figure 1.
The resulting structure has the primary advantage or insulating the end of the metal portions of the connector so as to give a desired creepage distance .or sparkover path. In addition to this, however, it .has the further advantage that when the enlarged portion 18-20 is crimped onto an insulated wire, the iii-turned plastic tube is molded into the insulation on the wireand the insulation is forced up over its inner edge so as to give a stronger and more secure engagement than in the case of a straight plastic sleeve not in-turned in this manner. A further advantage found also in the fact that the inturned plastic if not heated beyond a critical temperature of flow during the punch molding operation retains elastic memory or trapped stress such that it tends very slowly to return toward the smaller diameter which .it had as .indioated in Figures 2 and 3, and this tendency may be released if the temperature is raisedsubstantially. Any such recovery which occurs increases the pressure against the wire and thus gives a more secure connection.
What I claim is:
1....An electrical connector of the type .comprisferrule onto a wire, which is characterized by an end of the plastic sleeve being folded back into the end of the metal ferrule, said sleeve insulating the outer end of said ferrule inside and outside completely around its periphery and for a substantial distance from said periphery baclc' along the inside and outside of said ferrule, said sleeve end being at least semirigid and strongly resistant to collapse or compression by forces applied thereto along lines parallel to the axis of the sleeve and ferrule whereby when said sleeve and ferrule ends have been compacted upon an end portion of an insulation sheath on a wire said sleeve end cannot readily be slipped bodilyoutof said ferrule end.
2. An electrical connector of the type comprisingla metal ferrule and a covering sleeve of tough, malleable plastic material capable of transmitting sufiicient radial pressure for cold forging the ferrule onto a wire, which is characterized by an end of the plastic sleeve being folded back into the end of the metal ferrule; fitting closely in said metal ferrule and having elastic memory of a smaller circumference, said sleeve insulating the outer end of said ferrule inside and outside completely around its periphery and for a substantial distance from said periphery back along the .inside and outside of said ferrule, said sleeve end being at least semirigid and strongly resistant to collapse or compression by forces applied thereto along lines parallel to the axis of the sleeve and ferrule whereby when said sleeve and ferrule ends have, been compacted upon an end portion of an insulation sheath .on a wire said sleeve send cannot readily be slipped bodily out of said ferrule end.
3. An electrical connector having a metal ferrule portion adapted to receive the stripped end of the central conductor of an insulated wire, an insulation support portion of greater internal diameter than the first-named ferrule portion and extending beyond'said ferrule portion to receive the insulation on said wire, and a tube of touglr' malleable plastic covering the exterior and the end of said insulation support portion and extending back for a substantial distance entirely throughout its periphery in intimate contact with both the inner and outer walls of said insulation support, said tube being at least semirigid and strongly resistant to forces of compression applied thereto along lines parallel to the axis of the connector whereby when said insulation sup port portion is compressed upon an insulation sheath on a wire the portion of said tube between said insulation support portion and such insulation sheath cannot readily he slipped bodily out of said insulation support portion.
4. The method of insulating an electrical connector ferrule which comprises applying onto. said ferrule a sleeve of tough malleable plastic insulation material which is substantially longer than the ferrule and leaving a substantial length of said sleeve projecting beyond the end of theferrule, shrinking the sleeve onto the ferrule, pushing back into the open end of the ferrule and eX i pending the in-turned portion of "the sleeve to :fit
against the inside of the end portion .of the ferrule.
5. An electrical connector having a metal ferrule portion adapted to be cold forged into electrical contact with the center conductor of an insulated wire, a metal insulation supporting portion secured to and extending from said.f.er rule portion and adapted to surround and be cold forged into gripping relationship with the insulation covering of said wire, and a continuous integral tube of deformable insulating material circumferentially covering and being in intimate contact with the outer surface, one end,
and-a substantial annular portion adjoining said end on the interior of said insulation supporting portion, said insulating tube bein of such tough malleable material as to transmit the radial pressure by which said insulation supporting portion is cold forged onto the insulation covering 'of said wire said tube being at least semirigid and strongly resistant to forces of compression applied thereto along lines parallel to the ax'isof the connector whereby when said tube and supporting portion are compressed upon an end portion of the insulation covering on the wire the end of the tube cannot readily be pulled bodily out of the interior of said insulation supporting portion.
References Cited in the file of this patent UNITED STATES PATENTS Number ,Name Date 2,175,533 White Oct. 10, 1939 2,205,662 .Conradi-et al. July 2 1940 2,338,316 B-uzzell Jan. 4, .1944: $2,405,111 Carlson et ,al. Aug. 6,1946 2,410,321 Watts "7.-.. Oct. 29,1946 2,464,405 Knauf, Jr. Mar. vl5, .1949 2,533,200 Rogoff Dec. 5 .1950
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US100148A US2681439A (en) | 1949-06-20 | 1949-06-20 | Insulated electrical connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US100148A US2681439A (en) | 1949-06-20 | 1949-06-20 | Insulated electrical connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2681439A true US2681439A (en) | 1954-06-15 |
Family
ID=22278321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US100148A Expired - Lifetime US2681439A (en) | 1949-06-20 | 1949-06-20 | Insulated electrical connector |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2681439A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955044A (en) * | 1970-12-03 | 1976-05-04 | Amp Incorporated | Corrosion proof terminal for aluminum wire |
| US5095178A (en) * | 1990-12-21 | 1992-03-10 | Minnesota Mining And Manufacturing Company | Electrical connector and method |
| US20130180160A1 (en) * | 2009-12-21 | 2013-07-18 | Salamander Precision Technology Limited | Fishing tackle attachment apparatus and method |
| US8519267B2 (en) | 2009-02-16 | 2013-08-27 | Carlisle Interconnect Technologies, Inc. | Terminal having integral oxide breaker |
| US20160081318A1 (en) * | 2011-07-15 | 2016-03-24 | Russell Rothan | Fishing Tackle Knot Funnel Body |
| US9985362B2 (en) | 2015-10-22 | 2018-05-29 | Carlisle Interconnect Technologies, Inc. | Arc resistant power terminal |
| US10164348B2 (en) | 2009-02-16 | 2018-12-25 | Carlisle Interconnect Technologies, Inc. | Terminal/connector having integral oxide breaker element |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2175583A (en) * | 1938-04-02 | 1939-10-10 | Jesse M White | Terminal for electrical conductors |
| US2206662A (en) * | 1938-02-01 | 1940-07-02 | Ibm | Fabricating article of beryllium copper |
| US2338316A (en) * | 1941-07-05 | 1944-01-04 | Buzzell Francis Allen | Insulating bushing for electrical conduits and the like |
| US2405111A (en) * | 1942-09-25 | 1946-08-06 | Aircraft Marine Prod Inc | Electrical connection |
| US2410321A (en) * | 1943-12-14 | 1946-10-29 | Aircraft Marine Prod Inc | Electrical connector |
| US2464405A (en) * | 1944-07-22 | 1949-03-15 | Rca Corp | Method of attaching a pin type terminal to a base |
| US2533200A (en) * | 1945-09-15 | 1950-12-05 | Burndy Engineering Co Inc | Partially insulated electrical terminal |
-
1949
- 1949-06-20 US US100148A patent/US2681439A/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2206662A (en) * | 1938-02-01 | 1940-07-02 | Ibm | Fabricating article of beryllium copper |
| US2175583A (en) * | 1938-04-02 | 1939-10-10 | Jesse M White | Terminal for electrical conductors |
| US2338316A (en) * | 1941-07-05 | 1944-01-04 | Buzzell Francis Allen | Insulating bushing for electrical conduits and the like |
| US2405111A (en) * | 1942-09-25 | 1946-08-06 | Aircraft Marine Prod Inc | Electrical connection |
| US2410321A (en) * | 1943-12-14 | 1946-10-29 | Aircraft Marine Prod Inc | Electrical connector |
| US2464405A (en) * | 1944-07-22 | 1949-03-15 | Rca Corp | Method of attaching a pin type terminal to a base |
| US2533200A (en) * | 1945-09-15 | 1950-12-05 | Burndy Engineering Co Inc | Partially insulated electrical terminal |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955044A (en) * | 1970-12-03 | 1976-05-04 | Amp Incorporated | Corrosion proof terminal for aluminum wire |
| US5095178A (en) * | 1990-12-21 | 1992-03-10 | Minnesota Mining And Manufacturing Company | Electrical connector and method |
| US8519267B2 (en) | 2009-02-16 | 2013-08-27 | Carlisle Interconnect Technologies, Inc. | Terminal having integral oxide breaker |
| US10164348B2 (en) | 2009-02-16 | 2018-12-25 | Carlisle Interconnect Technologies, Inc. | Terminal/connector having integral oxide breaker element |
| US20130180160A1 (en) * | 2009-12-21 | 2013-07-18 | Salamander Precision Technology Limited | Fishing tackle attachment apparatus and method |
| US20160081318A1 (en) * | 2011-07-15 | 2016-03-24 | Russell Rothan | Fishing Tackle Knot Funnel Body |
| US9985362B2 (en) | 2015-10-22 | 2018-05-29 | Carlisle Interconnect Technologies, Inc. | Arc resistant power terminal |
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