EP0476410A1 - Verbinder mit flexibler Federwirkung - Google Patents

Verbinder mit flexibler Federwirkung Download PDF

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Publication number
EP0476410A1
EP0476410A1 EP91114747A EP91114747A EP0476410A1 EP 0476410 A1 EP0476410 A1 EP 0476410A1 EP 91114747 A EP91114747 A EP 91114747A EP 91114747 A EP91114747 A EP 91114747A EP 0476410 A1 EP0476410 A1 EP 0476410A1
Authority
EP
European Patent Office
Prior art keywords
cavity
connector
conductor
spring elements
conductors
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Withdrawn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
EP91114747A
Other languages
English (en)
French (fr)
Inventor
Norman Sacks
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.)
FCI USA LLC
Original Assignee
Burndy Corp
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 Burndy Corp filed Critical Burndy Corp
Publication of EP0476410A1 publication Critical patent/EP0476410A1/de
Withdrawn legal-status Critical Current

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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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • H01R4/363—Conductive members located under tip of screw with intermediate part between tip and conductive member
    • 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

Definitions

  • the present invention relates to connectors, particularly to connectors utilizing set screws for securing electrical wires in a connector with sufficient contact pressure to establish a reliable electrical contact.
  • set screw connectors are limited to installations in which there is minimal movement or flexing of the conductor with respect to the connector. Excessive movement or flexing of a conductor can be caused by oscillation induced by wind changes, ice loads, longitudinal thermal expansion of the conductor, and bending of the conductor by electricians working on adjacent wiring.
  • the connector will be used on high conductivity (EC) conductor which has an attendant, high creep characteristic.
  • EC conductivity
  • its creep rate is increased at the elevated temperature that results from normal operating current.
  • the initial pressure on the contact spots will be reduced substantially and the initial firm grip on the conductor is reduced. This will normally not cause a change in resistance unless the conductor is moved. If however the connection is disturbed, the low resistance contact may be broken and moved to an oxidized, high resistance conductor surface. This will lead to failure of the connector.
  • the body of the connector By designing the body of the connector to have a resilient spring element that will elongate sufficiently to compensate for the creep of the conductor, then the initial contact pressure can be more nearly maintained. This, in conjunction with the use of a connector alloy such as 6061 which has a superior creep characteristic, further assists the connector to maintain contact pressure. This will keep the contact spots intact, maintain the grip on the conductor, and avoid a potential connector failure.
  • the present invention provides a service connector for electrical wires having a connector body with a conductor groove or cavity defined by dual cooperating spring elements cooperating with a set screw and wire connector for establishing a suitable electrical connection and for indicating when sufficient torque has been applied to the set screw in establishing the connection.
  • the service connector with cooperating spring elements and set screw accommodates the ordinary movements and flexing of overhead or underground power lines in service.
  • the service connector is suitable for a single conductor connection or for multiple conductor connections as used for a secondary junction.
  • a further object of the invention is to provide a service connector with integral spring elements enabling the connector to establish a connection capable of enduring conductor motion, as well as vibrational and other moving disturbances.
  • a service connector 10 of the present invention is preferably an extrusion initially as a preform 12 having a crown portion 14 and downwardly depending sidewalls 16 terminating at their lower ends in converging spring elements 18.
  • the spring elements end faces 20 are spaced to define a gap G.
  • the downwardly depending sidewalls and spring elements define a connector groove or cavity 22 for receiving a conductor.
  • the gap defines an opening for a mandrel support (not shown) necessary to create the interior cavity during an extrusion operation.
  • the gap may be substantially closed (Fig. 2) by means of press rollers in a subsequent manufacturing operation.
  • a finished service connector is shown in Fig. 2 and 3 and includes the interior cavity for receiving a conductor, and a plurality of set screws 24 formed into the crown portion of the connector for entering the conductor cavity and compressing the conductor against the spring elements thereby forming a connection.
  • a slot 26 is formed in each sidewall of the connector by machining other suitable method for the purpose of allowing an operator to establish leverage when the set screws are being tightened to secure a conductor.
  • the operator will insert a suitable tool such as a screwdriver into the slot providing leverage so that the recommended torque can be applied to the each set screw utilizing an appropriate tool such as an allen wrench.
  • the slots are also useful in centering and visually inspecting the conductor location within the connector prior to securing conductors.
  • the spring elements 18 and the wedge shaped conductor cavity 22 provide resilient contact pressure and wiping action as between connector and conductors located therein.
  • the spring elements acquire their spring action by selection of material and manufacturing technique.
  • a preferred material is 6061-T6 high strength aluminum alloy initially extruded as a preform with depending side walls of given thickness and with converging spring elements of reduced wall thickness. After extrusion is completed, the spring elements are rolled inwardly toward the connector cavity as shown in Fig. 4.
  • the set screw presses conductor 23 against the spring elements urging them outwardly as shown in Fig. 5.
  • the spring elements have their extremities enter the conductor cavity defining a gap therebetween and the spring elements are adapted to move out of the cavity closing the gap when the conductor is secured in place providing visible means that suitable torque has been applied.
  • the spring elements provide flexibility in the connection which can absorb vibrations or oscillations induced by wind conditions or conductor disturbances in the vicinity of the connector installation.
  • the principles of the present invention are also applicable to a secondary junction 30 with resilient spring contact shown in Figs. 4-6.
  • the secondary junction is in the form of a unitary junction and includes a plurality of conductor cavities 32 as in the case of the embodiment of Figs. 4-6.
  • the junction is preferably extruded and comprises an elongated crown portion 34 with exterior side walls 36 depending from opposite sides of the crown.
  • Spring elements 38 project inwardly from the lower end of exterior side walls.
  • a plurality of interior side walls 40 depend from the crown and have oppositely directed spring elements 42.
  • the result is a plurality of cavities 32 defined by crown, adjacent side walls, and confronting spring elements.
  • the crown portion of the junction is fitted with a plurality of set screws 44, one for each conductor cavity.
  • the set screw will compress the conductor and rotate each of the spring fingers slightly in a downward direction bringing the spring tips in position adjacent to each other, closing the gap therebetween that existing prior to conductor installation as shown in Fig. 9. In this way, the operator has visual indication that proper contact force has been established between the set screw and the conductor.
  • the inner surface of the spring fingers may be knurled or scored for improved contact between junction and cable.
  • Fig. 7 illustrates a modification of the present design in which a spring section 50 is formed as thin wall section in the downwardly depending sidewall 52 between adjacent junction cavities 54.
  • the modified secondary junction connector includes a crown portion 56 and a closed base portion 58 interconnected by spring sections defining the laterally confined, open-ended conductor cavity 54.
  • the spring sections 50 are of reduced wall thickness and yield or stretch vertically to accommodate vibration or movement of a conductor secured in the connector by means of set screws.

Landscapes

  • Manufacturing Of Electrical Connectors (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
EP91114747A 1990-09-18 1991-09-02 Verbinder mit flexibler Federwirkung Withdrawn EP0476410A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US718038 1985-03-29
US58429190A 1990-09-18 1990-09-18
US71803891A 1991-06-20 1991-06-20
US584291 1996-01-11

Publications (1)

Publication Number Publication Date
EP0476410A1 true EP0476410A1 (de) 1992-03-25

Family

ID=27079058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114747A Withdrawn EP0476410A1 (de) 1990-09-18 1991-09-02 Verbinder mit flexibler Federwirkung

Country Status (4)

Country Link
EP (1) EP0476410A1 (de)
JP (1) JPH04245177A (de)
KR (1) KR920007266A (de)
MX (1) MX9101111A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE662149C (de) * 1936-12-31 1938-07-06 Aeg Anschlussklemme fuer Aluminiumleitungen
DE2141348B2 (de) * 1971-08-18 1973-11-15 Karl Pfisterer Fabrik Elektrotechnischer Spezialartikel, 7000 Stuttgart Verfahren zum Herstellen einstückig ausgebildeter Klemmenkorper fur Rund oder Sektorleiter aus Aluminium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE662149C (de) * 1936-12-31 1938-07-06 Aeg Anschlussklemme fuer Aluminiumleitungen
DE2141348B2 (de) * 1971-08-18 1973-11-15 Karl Pfisterer Fabrik Elektrotechnischer Spezialartikel, 7000 Stuttgart Verfahren zum Herstellen einstückig ausgebildeter Klemmenkorper fur Rund oder Sektorleiter aus Aluminium

Also Published As

Publication number Publication date
JPH04245177A (ja) 1992-09-01
KR920007266A (ko) 1992-04-28
MX9101111A (es) 1992-05-04

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Effective date: 19920926