EP0264382A1 - Waterproof splice connector having high tensile pullout resistance - Google Patents

Waterproof splice connector having high tensile pullout resistance

Info

Publication number
EP0264382A1
EP0264382A1 EP19870900423 EP87900423A EP0264382A1 EP 0264382 A1 EP0264382 A1 EP 0264382A1 EP 19870900423 EP19870900423 EP 19870900423 EP 87900423 A EP87900423 A EP 87900423A EP 0264382 A1 EP0264382 A1 EP 0264382A1
Authority
EP
European Patent Office
Prior art keywords
splice connector
tubular body
tubular
insert
connector according
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.)
Withdrawn
Application number
EP19870900423
Other languages
German (de)
French (fr)
Inventor
Chris Hertelendy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0264382A1 publication Critical patent/EP0264382A1/en
Withdrawn legal-status Critical Current

Links

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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5016—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a cone
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/523—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases for use under water
    • 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
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • 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
    • H01R4/70—Insulation of connections

Definitions

  • the present invention is concerned with electrical connectors, and more particularly splice connectors for joining the ends of pairs of electrical leads to provide a waterproof connection able to resist significant tensile loads.
  • blasting caps In conducting blasting operations for mining, excavation, seismic testing and the like, electrically detonated blasting caps are utilized. In many - . situations, the blasting caps are placed adjacent to charges located in boreholes at relatively great depth, extending vertically into the earth.
  • boreholes are below the water table such as to be flooded, so that the electrical connections thereto must be waterproof.
  • the leads to the blasting caps are also subjected to significant tensile stresses due to the relatively great depths and rough handling incidental to such operations.
  • a suitable splice connector for making electrical connections to the blasting cap has not heretofore been provided, which will with sufficient reliability achieve a waterproof connection which is also able to withstand the tensile stresses placed on the spliced connection in handling. For these reasons, the practice has been to provide a large inventory of blasting caps having leads of various lengths to accommodate various borehole depths.
  • an electrical connector comprised of a tubular body of electrically insulating material, mounting in its middle section a tubular metal insert positioned to receive electrical leads received through either end of the tubular body.
  • the tubular body in turn has expanded ends which receive sealing plugs of a resilient, electrically insulating material, each having a central opening receiving an electrical lead.
  • the sealing plugs are press fit into the expanded ends into a transition section of the body, which compresses the inside end of the sealing plug such as to close off the central opening to seal the interior of the connector and grip the electrical lead inserted therethrough.
  • the tubular insert carries conical receptacles which extending longitudinally through the insert interior and are oppositely facing. A series of reversely extending barbs formed into the receptacles grip an electrical lead inserted therein to resist pullout .
  • the tubular insert is of a crimpable material such as to enable crimping of the ends thereof through the tubular outer body to further secure the wire leads in the connector.
  • the tubular body is of transparent material assist in making an inspection of an inserted lead to insure proper making of the connection.
  • the interior of the tubular body is also filled with an anti-oxidant grease to seal out moisture and prevent oxidation of the electrically conductive surfaces and further inhance reliability of the connection.
  • a snap fit retainer clip is also utilized to together mount pairs of the splice connectors side-by- side to form a dual lead connector.
  • FIGURE 1 is a view in longitudinal section of an electrical splice connector according to the present invention.
  • FIGURE 2 is an endwise view of a pair of splice connectors according to the present invention, secured together by means of a retaining clip.
  • FIGURE 3 is a plan view of a pair of crimped connectors connected by means of a snap fit retainer clip.
  • the electrical splice connector 10 includes a tubular body 12 of an electrically insulating material such as transparent plastic tubing.
  • Tubular body 12 includes a middle section 14 and a pair of expanded larger diameter ends 16 at either side with transitional sections 18 therebetween. Press fit into each expanded end 16 is a sealing plug 20 of a resilient electrically insulating material such as rubber or neoprene.
  • Each sealing plug 20 is 'formed with a
  • SUBSTITUTE SHEET relatively small diameter central opening 22 sized to receive an electrical lead shown at 24 allowing easy insertion by guiding the electrical lead thereinto.
  • Each of the sealing plugs 20 is forced into the region of the transition section 18 such as to be compressed thereby, which in turn causes constriction of the openings 22. This constriction thus seals off the interior of the splice connector 10 prior to insertion of the electrical leads 24 and to grip the electrical leads 24 after insertion, to contribute to the retention forces acting on the wire and to seal around the wire electrical lead 24.
  • constriction effect is further enhanced upon crimping of the electrical splice connector as will be hereinafter described in further detail.
  • tubular insert 28 Mounted within the middle section 14 of the tubular body 12 is a tubular insert of metal or other electrically conductive crimpable material such as copper or brass.
  • the tubular insert 28 is provided with a pair of oppositely facing roughly conical, receptacles 34 also of a crimpable conductive material.
  • Each receptacle 34 extends generally lengthwise along the tubular insert 28, but which is inclined to extend across the width of the tubular insert 28 as well, brazed or otherwise suitably secured therein.
  • the oppositely directed, overlapping receptacles 34 each have their open wider end facing a respective end of the connector, and are each in position to receive an electrical lead inserted through the respective sealing plug 20.
  • Each receptacle 34 is wider at the receiving end and converges to terminate at a dead end
  • a series of barbs 36 are stamped or otherwise formed into the walls 30 of the receptacle 34, the
  • the splice connectors 10 are adapted to be connected in pairs as shown in Figure 2 by a snap fit 0 retainer 38 having oppositely directed C-shaped sides adapted to be snap fit around the central section 14 of the tubular body 12 of each connector 10.
  • the electrical leads are inserted in opposite ends of the electrical connector through the 5 respective sealing plugs 20 and into the respective receptacles 34 until bottoming in the dead end of the respective receptacle 34.
  • a simultaneous crimping operation is then preferably conducted on either of the ends of the metal 0 tubular inserts 28 at the location of the transition sections 18. This causes a tight gripping of each of the wire connector by further compression of the sealing plug 20. Full length engagement of the barbs 36 and the tight engagement of the sealing plugs 20, with the leads 5 24 produces a high tensile strength connector.
  • each of the splice connector 10 is preferably filled with an anti-oxidant sealant such as a mass of silicone grease, indicated at 40, to preclude the entry of moisture and inhibit the oxidation 0 of the electrically conductive surfaces to ensure reliability of a electrical connection made therebetween.
  • an anti-oxidant sealant such as a mass of silicone grease, indicated at 40, to preclude the entry of moisture and inhibit the oxidation 0 of the electrically conductive surfaces to ensure reliability of a electrical connection made therebetween.
  • any excess sealant maybe driven out past the electrical leads 24.
  • the electrical connector described produces a highly reliable electrical connection exhibiting waterproof and high tensile strength characteristics.
  • Each of the electrical leads is able to be gripped along its full length of insertion, by virtue of the overlapping oppositely directed receptacles 34. Engagement of the compressed sealing plugs 20 adds to the resistance to pull out of the electrical leads, as well as insuring a high degree of waterproofing as does the use of the anti-oxidant sealant .
  • these splice connectors are convenient and simple to use, and are connected in pairs during the crimping operation such that dual leads normally employed in blasting cap applications are provided. Accordingly, the splice connector according to the present invention suitable for such blasting cap applications to obviate the present requirement for a large inventory of blasting caps with various lead lengths.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)

Abstract

Un connecteur à épissure étanche à l'eau (10) pour des paires de conducteurs électriques a une résistance à la rupture élevée et est approprié à l'épissure de câbles de capsules de détonation, chacun des câbles électriques (24) étant reçu dans des extrémités opposées d'un des deux corps tubulaires (14) connectés par une attache, au travers de trous (22) formés dans des bouchons extrêmes d'étanchéité (20). Une pièce d'insertion métallique tubulaire (28) est disposée dans chaque corps (14) et possède des réceptacles (34) d'extrémité des conducteurs approximativement coniques et de sens opposé, chacun d'eux étant formé avec des barbes de retenue (36) des conducteurs en fil métallique. Les réceptacles coniques (34) permettent un tel recouvrement que la longueur totale de la pièce d'insertion (28) est utilisée pour serrer un conducteur électrique (24) respectif. Les bouchons d'étanchéité (20) se composent d'un matériau résilient comprimé dans des sections de transition convergentes (18) du corps (14) du connecteur pour comprimer les extrémités des bouchons et fermer ainsi les ouvertures (22) et serrer hermétiquement un conducteur électrique (24) respectif. L'intérieur du connecteur est rempli d'une matière d'étanchéité anti-oxydante (40) qui améliore l'étanchéité à l'eau de l'intérieur du connecteur.A waterproof splice connector (10) for pairs of electrical conductors has high breaking strength and is suitable for splicing cables of detonation capsules, each of the electrical cables (24) being received in opposite ends of one of the two tubular bodies (14) connected by a fastener, through holes (22) formed in extreme sealing plugs (20). A tubular metal insert (28) is disposed in each body (14) and has receptacles (34) for the ends of the conductors approximately conical and in opposite directions, each of which is formed with retaining barbs (36 ) wire conductors. The conical receptacles (34) allow such overlapping that the total length of the insert (28) is used to clamp a respective electrical conductor (24). The sealing plugs (20) consist of a resilient material compressed in converging transition sections (18) of the body (14) of the connector to compress the ends of the plugs and thereby close the openings (22) and hermetically tighten a respective electrical conductor (24). The interior of the connector is filled with an antioxidant sealant (40) which improves the water tightness of the interior of the connector.

Description

ATERPROOF SPLICE CONNECTOR HAVING HIGH TENSILE PULLOUT RESISTANCE
BACKGROUND OF THE INVENTION
The present invention is concerned with electrical connectors, and more particularly splice connectors for joining the ends of pairs of electrical leads to provide a waterproof connection able to resist significant tensile loads.
In conducting blasting operations for mining, excavation, seismic testing and the like, electrically detonated blasting caps are utilized. In many - . situations, the blasting caps are placed adjacent to charges located in boreholes at relatively great depth, extending vertically into the earth.
In such blasting operations there are typically a large number of charges and blasting caps imp laced which all must simultaneously be detonated, or the blast will not produce the desired result and a mis¬ fire of any charge requires in a very costly reboring of the boreholes and emplacement and wiring of new charges.
Typically, such boreholes are below the water table such as to be flooded, so that the electrical connections thereto must be waterproof.
The leads to the blasting caps are also subjected to significant tensile stresses due to the relatively great depths and rough handling incidental to such operations.
A suitable splice connector for making electrical connections to the blasting cap has not heretofore been provided, which will with sufficient reliability achieve a waterproof connection which is also able to withstand the tensile stresses placed on the spliced connection in handling. For these reasons, the practice has been to provide a large inventory of blasting caps having leads of various lengths to accommodate various borehole depths.
Accordingly, it is an object of the present invention to provide a electrical connector for making dual splice connections between electrical leads, which is waterproof and able to withstand significant tensile stress, to allow reliable connections to detonator cap leads of a single length.
It is a further object of the present invention to provide such splice connector which is simple, low in cost, and easily usable in the field.
SUMMARY OF THE INVENTION
These and other objects of the present invention which will become apparent upon a reading of the following specification and claims are achieved by an electrical connector comprised of a tubular body of electrically insulating material, mounting in its middle section a tubular metal insert positioned to receive electrical leads received through either end of the tubular body.
The tubular body in turn has expanded ends which receive sealing plugs of a resilient, electrically insulating material, each having a central opening receiving an electrical lead.
The sealing plugs are press fit into the expanded ends into a transition section of the body, which compresses the inside end of the sealing plug such as to close off the central opening to seal the interior of the connector and grip the electrical lead inserted therethrough.
The tubular insert carries conical receptacles which extending longitudinally through the insert interior and are oppositely facing. A series of reversely extending barbs formed into the receptacles grip an electrical lead inserted therein to resist pullout .
The tubular insert is of a crimpable material such as to enable crimping of the ends thereof through the tubular outer body to further secure the wire leads in the connector. The tubular body is of transparent material assist in making an inspection of an inserted lead to insure proper making of the connection.
The interior of the tubular body is also filled with an anti-oxidant grease to seal out moisture and prevent oxidation of the electrically conductive surfaces and further inhance reliability of the connection.
A snap fit retainer clip is also utilized to together mount pairs of the splice connectors side-by- side to form a dual lead connector.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a view in longitudinal section of an electrical splice connector according to the present invention.
FIGURE 2 is an endwise view of a pair of splice connectors according to the present invention, secured together by means of a retaining clip.
FIGURE 3 is a plan view of a pair of crimped connectors connected by means of a snap fit retainer clip.
DETAILED, DESCRIPTION
In the following detailed description certain specific terminology will be employed for the sake of clarity and a particular embodiment described in accordance with the requirements of 35 USC 112, but it is to be understood that the same is not intended to be limiting and indeed should not be so construed inasmuch as the invention is capable of taking many forms and variations within the scope of the appended claims.
Referring to the drawings, and in particular
Figure 1, the electrical splice connector 10, according to the present invention includes a tubular body 12 of an electrically insulating material such as transparent plastic tubing.
Tubular body 12 includes a middle section 14 and a pair of expanded larger diameter ends 16 at either side with transitional sections 18 therebetween. Press fit into each expanded end 16 is a sealing plug 20 of a resilient electrically insulating material such as rubber or neoprene.
Each sealing plug 20 is 'formed with a
SUBSTITUTE SHEET relatively small diameter central opening 22 sized to receive an electrical lead shown at 24 allowing easy insertion by guiding the electrical lead thereinto. Each of the sealing plugs 20 is forced into the region of the transition section 18 such as to be compressed thereby, which in turn causes constriction of the openings 22. This constriction thus seals off the interior of the splice connector 10 prior to insertion of the electrical leads 24 and to grip the electrical leads 24 after insertion, to contribute to the retention forces acting on the wire and to seal around the wire electrical lead 24.
The constriction effect is further enhanced upon crimping of the electrical splice connector as will be hereinafter described in further detail.
Mounted within the middle section 14 of the tubular body 12 is a tubular insert of metal or other electrically conductive crimpable material such as copper or brass. The tubular insert 28 is provided with a pair of oppositely facing roughly conical, receptacles 34 also of a crimpable conductive material. Each receptacle 34 extends generally lengthwise along the tubular insert 28, but which is inclined to extend across the width of the tubular insert 28 as well, brazed or otherwise suitably secured therein.
The oppositely directed, overlapping receptacles 34 each have their open wider end facing a respective end of the connector, and are each in position to receive an electrical lead inserted through the respective sealing plug 20. Each receptacle 34 is wider at the receiving end and converges to terminate at a dead end
SUBSTITUTE SHEE to prevent an inserted lead 24 from passing through the interior of the splice connector 10.
A series of barbs 36 are stamped or otherwise formed into the walls 30 of the receptacle 34, the
-5 barbs reversely inclined as shown in Figure 1 to the direction of withdrawal of the respective leads 24, such as to engage and grip the leads 24, resisting pull out.
The splice connectors 10 are adapted to be connected in pairs as shown in Figure 2 by a snap fit 0 retainer 38 having oppositely directed C-shaped sides adapted to be snap fit around the central section 14 of the tubular body 12 of each connector 10.
In use, the electrical leads are inserted in opposite ends of the electrical connector through the 5 respective sealing plugs 20 and into the respective receptacles 34 until bottoming in the dead end of the respective receptacle 34.
A simultaneous crimping operation is then preferably conducted on either of the ends of the metal 0 tubular inserts 28 at the location of the transition sections 18. This causes a tight gripping of each of the wire connector by further compression of the sealing plug 20. Full length engagement of the barbs 36 and the tight engagement of the sealing plugs 20, with the leads 5 24 produces a high tensile strength connector.
The interior of each of the splice connector 10 is preferably filled with an anti-oxidant sealant such as a mass of silicone grease, indicated at 40, to preclude the entry of moisture and inhibit the oxidation 0 of the electrically conductive surfaces to ensure reliability of a electrical connection made therebetween. Upon crimping of the electrical connector any excess sealant maybe driven out past the electrical leads 24.
Accordingly, it can be appreciated that the electrical connector described produces a highly reliable electrical connection exhibiting waterproof and high tensile strength characteristics. Each of the electrical leads is able to be gripped along its full length of insertion, by virtue of the overlapping oppositely directed receptacles 34. Engagement of the compressed sealing plugs 20 adds to the resistance to pull out of the electrical leads, as well as insuring a high degree of waterproofing as does the use of the anti-oxidant sealant . At the same time, these splice connectors are convenient and simple to use, and are connected in pairs during the crimping operation such that dual leads normally employed in blasting cap applications are provided. Accordingly, the splice connector according to the present invention suitable for such blasting cap applications to obviate the present requirement for a large inventory of blasting caps with various lead lengths.

Claims

1. A splice connector for electrical leads comprising: a tubular body of an electrically insulating material; a sealing plug of a resilient, electrically insulating material mounted in each end of said tubular body having a central opening to receive an electrical lead; a tubular insert mounted within said tubular body so as to receive electrical leads inserted through either end plug; roughly conical oppositely directed conductive electrical lead receptacles and overlapping each other in said insert for receiving a respective electrical lead; a plurality of barbs extending inwardly from said receptacle walls to grip and retain electrical leads inserted therein.
2. The splice connector according to claim 1 wherein said receptacles are mounted extending within said insert to be inclined across the width of said tubular insert.
3. The splice connector according to claim 1 wherein said tubular insert is formed of crimpable metal to enable crimping thereof at each end through said tubular body.
4. The splice connector according to claim 1 wherein said tubular body is formed with a transition section between a middle section and each of a larger diameter expanded end, each end receiving a respective sealing plug, and wherein each sealing plug is press fit thereinto and compressed into said transition section, said central opening and transition section sized so that insertion of said sealing plug closes off said central opening at one end of said sealing plug.
5. The splice connector according to claim 4 wherein the interior of said middle section of said tubular body and said tubular insert is filled with an anti-oxidant sealant.
6. The splice connector according to claim 1 wherein said tubular body is of transparent plastic allowing visual inspection of an inserted electrical lead.
7. The splice connector according to claim 1 further including a clip able to be snap fit to a pair of tubular bodies of side-by-side connectors to enable secure ent together of a pair of splice connectors.
8. The splice connector according to claim 5 wherein said sealant is silicon grease.
EP19870900423 1985-11-25 1986-11-25 Waterproof splice connector having high tensile pullout resistance Withdrawn EP0264382A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80146185A 1985-11-25 1985-11-25
US801461 1985-11-25

Publications (1)

Publication Number Publication Date
EP0264382A1 true EP0264382A1 (en) 1988-04-27

Family

ID=25181163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900423 Withdrawn EP0264382A1 (en) 1985-11-25 1986-11-25 Waterproof splice connector having high tensile pullout resistance

Country Status (3)

Country Link
EP (1) EP0264382A1 (en)
AU (1) AU6772287A (en)
WO (1) WO1987003427A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2751482B1 (en) * 1996-07-18 1998-09-04 Sylea DEVICE FOR PERFORMING A SPLICE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2204237A (en) * 1938-08-20 1940-06-11 Charles M Slack Alarm cable and switch
US2291434A (en) * 1940-10-30 1942-07-28 Orville C Hollopeter Connector and loading coil for electric conductors
US2753392A (en) * 1952-12-05 1956-07-03 Edward S Hebeler Cable connections

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8703427A1 *

Also Published As

Publication number Publication date
WO1987003427A1 (en) 1987-06-04
AU6772287A (en) 1987-07-01

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