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EP1237226B1 - Improvements in or relating to electrical connectors - Google Patents

Improvements in or relating to electrical connectors Download PDF

Info

Publication number
EP1237226B1
EP1237226B1 EP01301442A EP01301442A EP1237226B1 EP 1237226 B1 EP1237226 B1 EP 1237226B1 EP 01301442 A EP01301442 A EP 01301442A EP 01301442 A EP01301442 A EP 01301442A EP 1237226 B1 EP1237226 B1 EP 1237226B1
Authority
EP
European Patent Office
Prior art keywords
contact
metal sleeve
spring finger
cable
pin
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
Application number
EP01301442A
Other languages
German (de)
French (fr)
Other versions
EP1237226A1 (en
Inventor
Conrad Higgs
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.)
Maxview Ltd
Original Assignee
Maxview Ltd
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 Maxview Ltd filed Critical Maxview Ltd
Priority to EP01301442A priority Critical patent/EP1237226B1/en
Priority to DE60105965T priority patent/DE60105965T2/en
Priority to AT01301442T priority patent/ATE278254T1/en
Publication of EP1237226A1 publication Critical patent/EP1237226A1/en
Application granted granted Critical
Publication of EP1237226B1 publication Critical patent/EP1237226B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • 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
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/4846—Busbar details
    • 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
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/4846—Busbar details
    • H01R4/4848—Busbar integrally formed with the spring
    • 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
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/48185—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar adapted for axial insertion of a wire end
    • H01R4/4819—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar adapted for axial insertion of a wire end the spring shape allowing insertion of the conductor end when the spring is unbiased
    • H01R4/4821—Single-blade spring
    • 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
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/484—Spring housing details

Definitions

  • This invention concerns improvements in electrical connectors, and relates more especially, but not exclusively, to co-axial connectors of the kind utilised for connecting the cables of television antennas to associated equipment.
  • Hitherto known co-axial connectors of this kind generally comprise an outer cylindrical sleeve within which is supported a hollow centre pin via an insulating spacer.
  • the outer cylindrical sleeve is secured within, or is integral with, a male threaded housing member that engages with a female threaded housing cap having a central aperture through which the co-axial cable can pass.
  • a collapsible contact element that is placed around the braided conductor of the co-axial cable in order to provide an electrical connection between the latter and the outer cylindrical sleeve.
  • the electrically insulated centre core of the cable is stripped to expose the centre conductor of the co-axial cable, which is normally a single strand of copper wire, and the latter is inserted within the hollow centre pin of the electrical connector.
  • an object of the invention to provide an electrical connector that can be connected to an electrical cable in a simple manner whilst ensuring a reliable electrical contact between a wire conductor of the cable and a hollow pin contact of the connector.
  • a generally cylindrical contact pin is formed by rolling from sheet metal to the shape illustrated and is composed of suitable electrical contact material such as nickel plated brass or phosphor bronze.
  • the dimensions of the pin correspond to those of a standard co-axial television cable connector and, typically, the pin would be of approximately 17.5mm in length and 2.4mm in external diameter.
  • the cylindrical wall 1 of the contact is tapered inwardly at one end 2, in a conventional manner, and has a longitudinal slit 3 formed by the abutting edges of the rolled sheet from which the contact is formed.
  • An opposite end of the contact has a trumpet shaped mouth 4 to facilitate insertion an electrical conductor and to retain the pin within an outer insulator as described below.
  • an internally angled spring finger 5 is formed by severing a portion of the cylindrical wall 1 of the contact pin and folding this inwardly to the shape illustrated.
  • the internally directed spring finger 5 has a shoulder portion 6 forming a transition between the cylindrical wall 1 of the contact pin and a flattened portion 7 that is angled inwardly relatively to the axis of the contact pin, for example at an angle of approximately 155°.
  • a flattened end portion 7A of the spring finger 5 is angled away from the longitudinal axis of the contact, at an angle of, for example, 25°, to form an elbow in the contact finger 5 as shown in Fig. 1.
  • the residual aperture left in the wall of the cylindrical contact terminates at a free edge in an outwardly angled lip 8, as can be seen from Figs. 1 and 3.
  • a complete electrical connector incorporating the contact of Figs. 1 and 3 comprises a generally cylindrical metal sleeve 9 secured within a male screw threaded housing member 10 and having a portion 9A of wider diameter and a narrow portion 9B.
  • An annular member 11 of electrically insulating material is located within the sleeve 9 and has a wider portion 11A fitting within the wider portion 9A of the conductor sleeve 9, and a narrow portion 11B fitting within the narrow portion 9B of the sleeve 9.
  • the insulator 11 is located axially by means of a shoulder of the sleeve 9 between the wider and narrower portions 9A and 9B.
  • the contact pin 1 is a push fit within a central aperture of the annular insulator 11, the lip 8 of the contact 1 serving as an abutment to snap engage with one end of the insulator 11 and the widened trumpet mouth 4 abutting against the other end. The contact pin 1 is thus retained therein against relative displacement, in use.
  • the internal wall of the insulator 11 overlies the aperture in the wall of the contact pin 1, and thus presents the end 7A of the spring finger 5 from being displaced outwardly through the aperture in the wall 1 of the contact.
  • the portion 7 of the spring finger 5 is firstly engaged by the wire conductor and displaced outwardly until the free end 7A contacts the internal surface of the insulator 11. Thereafter, upon further insertion of the conductor wire, the two angled portions 7,7A of the finger 5 are flexed relatively to one another in order to ensure firm contact between the spring finger 5 and the conductor wire.
  • the cable After insertion of a central conductor of a coaxial cable into the contact pin, the cable is retained in place in conventional manner by securing a female threaded cap 12 on to the male threaded housing member 10, a collapsible contact member 13 providing an electrical connection between the outer conductor of the co-axial cable and the cylindrical sleeve 9 in a conventional manner that is well known to those skilled in the art.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Organic Insulating Materials (AREA)

Abstract

A pin contact intended to form the centre pin of a co-axial cable connector comprises a generally cylindrical wall portion (1) a longitudinal portion of which is partially severed to define an internally extending spring finger (5) for engagement with an electrical cable conductor inserted within the hollow pin connector. The spring finger (5) may include a reversely angled portion (7A) defining an elbow, the arrangement being such that, in use, the elbow is held in engagement with a cable conductor by contact of the angled portion (7A) against an insulating member surrounding the external wall of the contact pin. <IMAGE>

Description

  • This invention concerns improvements in electrical connectors, and relates more especially, but not exclusively, to co-axial connectors of the kind utilised for connecting the cables of television antennas to associated equipment.
  • Hitherto known co-axial connectors of this kind generally comprise an outer cylindrical sleeve within which is supported a hollow centre pin via an insulating spacer. The outer cylindrical sleeve is secured within, or is integral with, a male threaded housing member that engages with a female threaded housing cap having a central aperture through which the co-axial cable can pass. Between the threaded portions of the housing is arranged a collapsible contact element that is placed around the braided conductor of the co-axial cable in order to provide an electrical connection between the latter and the outer cylindrical sleeve. The electrically insulated centre core of the cable is stripped to expose the centre conductor of the co-axial cable, which is normally a single strand of copper wire, and the latter is inserted within the hollow centre pin of the electrical connector.
  • Various means have hitherto been proposed for establishing electrical connect between the hollow centre pin and the wire conductor inserted therein, including the use of clamping screws or a soldered connection. These are, however, labour intensive, and in many cases an operative will simply leave the single strand of copper wire loosely inserted within the centre pin, an electrical contact being promoted by slightly kinking the wire conductor. Whilst the latter form of connection may well serve sufficiently to enable conduction of an analogue television signal from an antenna, an improved electrical connection is required where the transmission of digital television signals is concerned. Since the same antenna may be used for the receipt of both analogue and digital television signals, reception problems may thus occur with digital signals when a co-axial connector is assembled to the antenna cable in the conventional manner.
  • Accordingly it is an object of the invention to provide an electrical connector that can be connected to an electrical cable in a simple manner whilst ensuring a reliable electrical contact between a wire conductor of the cable and a hollow pin contact of the connector.
  • There is known, see US-5,865,654, a contact pin assembly for an electrical connector having the features of the preamble of Claim 1. In such a connector, however, contact between the conductor of the electrical cable and the spring finger of the contact pin assembly is achieved solely by the inherent resilience of the inwardly angled portion of the spring finger, and pressure contact between the cable conductor and the spring finger is limited by the inherent resilience of the spring finger at the point where it joins the cylindrical sleeve.
  • It is an object of the present invention to provide an arrangement allowing greater pressure contact to be applied by the spring finger and thus a more reliable electrical connection.
  • This object is achieved by the features of the characterising clause of Claim 1.
  • Further preferred features and advantages of the invention will become apparent from the following description taken in conjunction with the subordinate claims.
  • The invention is illustrated by way of example in the accompanying drawings, in which,
  • Figure 1 is a longitudinal sectional view of one embodiment of pin contact in accordance with the invention, taken on the line A-A of Fig. 2,
  • Figure 2 is a plan view of the pin contact shown in Fig. 1,
  • Figure 3 is a perspective view of the pin contact of Figs. 1 and 2,
  • Figure 4 is an axial cross section of an assembled co-axial connector incorporating the contact pin of Figs. 1 to 3, and
  • Figure 5 is an enlarged fragmentary view showing a portion of the connector shown in Fig. 4.
  • Referring to Figs. 1 to 3 of the drawings, a generally cylindrical contact pin is formed by rolling from sheet metal to the shape illustrated and is composed of suitable electrical contact material such as nickel plated brass or phosphor bronze.
  • The dimensions of the pin correspond to those of a standard co-axial television cable connector and, typically, the pin would be of approximately 17.5mm in length and 2.4mm in external diameter. The cylindrical wall 1 of the contact is tapered inwardly at one end 2, in a conventional manner, and has a longitudinal slit 3 formed by the abutting edges of the rolled sheet from which the contact is formed. An opposite end of the contact has a trumpet shaped mouth 4 to facilitate insertion an electrical conductor and to retain the pin within an outer insulator as described below.
  • As can be seen from Figs. 1 and 3, an internally angled spring finger 5 is formed by severing a portion of the cylindrical wall 1 of the contact pin and folding this inwardly to the shape illustrated. Thus, the internally directed spring finger 5 has a shoulder portion 6 forming a transition between the cylindrical wall 1 of the contact pin and a flattened portion 7 that is angled inwardly relatively to the axis of the contact pin, for example at an angle of approximately 155°. A flattened end portion 7A of the spring finger 5 is angled away from the longitudinal axis of the contact, at an angle of, for example, 25°, to form an elbow in the contact finger 5 as shown in Fig. 1. The residual aperture left in the wall of the cylindrical contact terminates at a free edge in an outwardly angled lip 8, as can be seen from Figs. 1 and 3.
  • Referring to Figs. 4 and 5, a complete electrical connector incorporating the contact of Figs. 1 and 3 comprises a generally cylindrical metal sleeve 9 secured within a male screw threaded housing member 10 and having a portion 9A of wider diameter and a narrow portion 9B.
  • An annular member 11 of electrically insulating material is located within the sleeve 9 and has a wider portion 11A fitting within the wider portion 9A of the conductor sleeve 9, and a narrow portion 11B fitting within the narrow portion 9B of the sleeve 9. The insulator 11 is located axially by means of a shoulder of the sleeve 9 between the wider and narrower portions 9A and 9B.
  • As illustrated more clearly in Fig. 5, the contact pin 1 is a push fit within a central aperture of the annular insulator 11, the lip 8 of the contact 1 serving as an abutment to snap engage with one end of the insulator 11 and the widened trumpet mouth 4 abutting against the other end. The contact pin 1 is thus retained therein against relative displacement, in use.
  • As can also be seen from Fig. 5, the internal wall of the insulator 11 overlies the aperture in the wall of the contact pin 1, and thus presents the end 7A of the spring finger 5 from being displaced outwardly through the aperture in the wall 1 of the contact. Thus, upon insertion of a central wire conductor into the contact pin, the portion 7 of the spring finger 5 is firstly engaged by the wire conductor and displaced outwardly until the free end 7A contacts the internal surface of the insulator 11. Thereafter, upon further insertion of the conductor wire, the two angled portions 7,7A of the finger 5 are flexed relatively to one another in order to ensure firm contact between the spring finger 5 and the conductor wire.
  • After insertion of a central conductor of a coaxial cable into the contact pin, the cable is retained in place in conventional manner by securing a female threaded cap 12 on to the male threaded housing member 10, a collapsible contact member 13 providing an electrical connection between the outer conductor of the co-axial cable and the cylindrical sleeve 9 in a conventional manner that is well known to those skilled in the art.
  • Although the above described arrangement comprises one exemplary embodiment of the invention, it will be appreciated that various modifications and alternations may be made thereto without departing from the scope of the invention as defined in the appended Claims.

Claims (4)

  1. A contact pin assembly for an electrical connector to be attached to an electrical cable, comprising a generally cylindrical metal sleeve (1) for receiving a central conductor of an electrical cable and an annular insulator (11) arranged coaxially with said metal sleeve for spacing said sleeve (1) from an outer conductor (9) to be arranged coaxially therewith, wherein a longitudinally extending portion of the wall of said metal sleeve (1) is partially severed therefrom to form a spring finger (5) having a portion (7) angled inwardly and a portion (7A) angled outwardly to form an elbow for contact with a central conductor of an electrical cable, characterised in that said annular insulator (11) is located around said metal sleeve (1) to form an abutment for engagement by said outwardly angled portion (7A) of said spring finger upon insertion of a cable conductor within said cylindrical metal sleeve (1), whereby said spring finger (5) is held in firm contact with the cable conductor.
  2. A contact pin assembly according to Claim 1 wherein a free edge of an aperture defined in the wall of said metal sleeve (1) by the severance of said spring finger (5) is angled outwardly (8) to retain the metal sleeve (1) within said annular insulator by snap engagement therein.
  3. A contact pin assembly according to Claim 2, wherein said annular insulator is retained between said outwardly angled free edge (8) and a widened mouth of said cylindrical metal sleeve (1).
  4. A contact pin assembly according to any of Claims 1 to 3, wherein said pin contact is incorporated within a co-axial cable connector to form the centre pin thereof.
EP01301442A 2001-02-19 2001-02-19 Improvements in or relating to electrical connectors Expired - Lifetime EP1237226B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01301442A EP1237226B1 (en) 2001-02-19 2001-02-19 Improvements in or relating to electrical connectors
DE60105965T DE60105965T2 (en) 2001-02-19 2001-02-19 Improvements in or regarding electrical connectors
AT01301442T ATE278254T1 (en) 2001-02-19 2001-02-19 IMPROVEMENTS IN OR RELATING TO ELECTRICAL CONNECTORS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01301442A EP1237226B1 (en) 2001-02-19 2001-02-19 Improvements in or relating to electrical connectors

Publications (2)

Publication Number Publication Date
EP1237226A1 EP1237226A1 (en) 2002-09-04
EP1237226B1 true EP1237226B1 (en) 2004-09-29

Family

ID=8181723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01301442A Expired - Lifetime EP1237226B1 (en) 2001-02-19 2001-02-19 Improvements in or relating to electrical connectors

Country Status (3)

Country Link
EP (1) EP1237226B1 (en)
AT (1) ATE278254T1 (en)
DE (1) DE60105965T2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10317867B3 (en) * 2003-04-17 2004-10-07 Amphenol-Tuchel Electronics Gmbh Contact arrangement for contacting electrical conductor has one-piece contact element with contact part for contacting matching counter contact and connector part for holding end of conductor
GB2423422B (en) * 2004-02-21 2007-01-03 Hitesh Dhanji Patel Electrical connections and connectors
CN105870649B (en) * 2016-05-25 2019-02-26 国网河南省电力公司济源供电公司 A safety type needle-shaped quick connector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5061207A (en) * 1990-09-27 1991-10-29 Gte Products Corporation Connector for a shielded coaxial cable
US5474470A (en) * 1994-03-30 1995-12-12 Itt Corporation Compensated interface coaxial connector apparatus
US5865654A (en) * 1997-01-23 1999-02-02 Raychem Corporation Coaxial cable connector

Also Published As

Publication number Publication date
EP1237226A1 (en) 2002-09-04
DE60105965T2 (en) 2005-10-13
ATE278254T1 (en) 2004-10-15
DE60105965D1 (en) 2004-11-04

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