EP0863572A2 - Terminal or jointing clamp for a coated overhead cable and moment screw used therein - Google Patents

Terminal or jointing clamp for a coated overhead cable and moment screw used therein Download PDF

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Publication number
EP0863572A2
EP0863572A2 EP98200581A EP98200581A EP0863572A2 EP 0863572 A2 EP0863572 A2 EP 0863572A2 EP 98200581 A EP98200581 A EP 98200581A EP 98200581 A EP98200581 A EP 98200581A EP 0863572 A2 EP0863572 A2 EP 0863572A2
Authority
EP
European Patent Office
Prior art keywords
terminal
moment
screw
jointing clamp
clamping screw
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Withdrawn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
EP98200581A
Other languages
German (de)
French (fr)
Other versions
EP0863572A3 (en
Inventor
Harri Turunen
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.)
Ensto Sekko Oy
Original Assignee
Ensto Sekko Oy
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 Ensto Sekko Oy filed Critical Ensto Sekko Oy
Publication of EP0863572A2 publication Critical patent/EP0863572A2/en
Publication of EP0863572A3 publication Critical patent/EP0863572A3/en
Withdrawn legal-status Critical Current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
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
    • H01R4/2408—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation actuated by clamping screws
    • 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
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H01R4/44—Clamping areas on both sides of screw

Definitions

  • the present invention relates to a terminal or jointing clamp for an overhead cable, comprising two pairs of toothed jaws pressable against each other, a clamping screw for pressing the jaws against each other, and a moment transmission nut provided with a fracture point for turning the clamping screw.
  • the invention relates also to a moment screw, serving as a clamping element in a terminal or jointing clamp for a coated overhead cable and including a moment transmission nut provided with a fracture point.
  • An object of the invention is to provide a terminal or jointing clamp of the above type and a moment screw there-for, which are capable of achieving a voltage working ability without insulating the threaded portion of the screw from live jaws and which is further capable of accurately achieving a desired moment level.
  • the terminal or jointing clamp includes two pairs of opposite jaws 1, 2 provided with teeth piercing through the insulation.
  • the jaws 1 are included in a lower jaw element, which is axially coupled by way of a brace element 3 with an elongated rail 6 provided in turn with a threaded hole engaged by the threading of a clamping screw 5.
  • the clamping screw 5 has its top end provided with a hexagon head 7, which is embedded in a recess existing in an insulator block 8.
  • a portion of the insulator block 8 constitutes an insulation layer 9 surrounding the head 7.
  • the insulation layer 9 is surrounded by a hexagonal metal bushing 10, which in turn surrounds a moment transmission nut 11 below its fracture point 12.
  • a torsional force from the nut 11 to the head 7 is transmitted by way of the metal bushing 10 and the insulation layer 9.
  • the nut 11 is isolated from the hexagon head screw 5, 7, which functions as an actual clamping screw.
  • the moment transmission nut 11 be provided with a metallic cutout 12 for determining accurately a desired moment level.
  • the upper jaw element 2 When tightening the moment screw by turning the nut member 11 above the cut-out, the threads of the screw 5 pull the lower jaws 1 upwards through the intermediary of the elements 6, 3.
  • the upper jaws 2 bear against the screw head 7 through the intermediary of the brace element 4.
  • the upper jaw element and its brace element 4 are provided with a sufficiently loose hole for allowing the inclination thereof, as depicted in fig. 3. This enables the coupling of wires with varying thicknesses.
  • the upper jaw element 2, 2 is held in a top position by means of cams 16 engaging the ends of a housing or a box 13.
  • Reference numeral 15 designates wire openings included in the ends of the box 13.
  • the figure only shows the top portion 13 of the box or housing.
  • the insulation layer 9 is integral with the wide cap-shaped element 8 which closes an opening included in the top side of the terminal box 13, said opening being sufficiently large for enabling the inclination of the top half 13 of the terminal box relative to the moment screw, as depicted in fig. 3.
  • the top opening of the box 13 can be closed with a lid 14.
  • the lid 14 cannot be placed in position until the nut 11 is broken.
  • the joint can also be readily unclamped by removing the lid 14 and by unscrewing the nut 11 from the polygonal metal bushing 10.

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Cable Accessories (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Electric Cable Installation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Communication Cables (AREA)

Abstract

The invention relates to a terminal or jointing clamp for a coated overhead cable and to a moment screw, the latter serving as a terminal clamping element. The moment screw includes a moment transmission nut (11), provided with a fracture point (12) and engaged with a head (7) of a clamping screw (5) through the intermediary of an insulation layer (9). Such a terminal or jointing clamp is capable of voltage work, while enabling an accurate calibration for the operation of the moment screw.

Description

The present invention relates to a terminal or jointing clamp for an overhead cable, comprising two pairs of toothed jaws pressable against each other, a clamping screw for pressing the jaws against each other, and a moment transmission nut provided with a fracture point for turning the clamping screw. The invention relates also to a moment screw, serving as a clamping element in a terminal or jointing clamp for a coated overhead cable and including a moment transmission nut provided with a fracture point.
This type of terminal or jointing clamp is prior known e.g. from Patent publication FR-2601516 and Patent publication DE-3824741. In the former, a contact shielding or shroud is achieved by using an insulating layer on top of the hexagon head of a clamping screw. A problem with this solution is the difficulty in reaching desired moment levels. The threaded portion of a moment screw used in the latter publication is entirely insulated from jaw elements in contact with the wires. The construction is complicated and inconvenient.
An object of the invention is to provide a terminal or jointing clamp of the above type and a moment screw there-for, which are capable of achieving a voltage working ability without insulating the threaded portion of the screw from live jaws and which is further capable of accurately achieving a desired moment level.
This object is achieved by means of a terminal or jointing clamp set forth in the appended claim 1 and a moment screw set forth in claim 2. The non-independent claims disclose preferred embodiments of the invention.
One exemplary embodiment of the invention will now be described in more detail with reference made to the accompanying drawing, in which
fig. 1
shows a terminal or jointing clamp of the invention in cross-section;
fig. 2
shows the terminal or jointing clamp of fig. 1 in a plan view; and
fig. 3
shows the terminal or jointing clamp of fig. 1 with only one pair of jaws 1, 2 having a wire 17 therebetween.
The terminal or jointing clamp includes two pairs of opposite jaws 1, 2 provided with teeth piercing through the insulation. The jaws 1 are included in a lower jaw element, which is axially coupled by way of a brace element 3 with an elongated rail 6 provided in turn with a threaded hole engaged by the threading of a clamping screw 5.
The clamping screw 5 has its top end provided with a hexagon head 7, which is embedded in a recess existing in an insulator block 8. In other words, a portion of the insulator block 8 constitutes an insulation layer 9 surrounding the head 7. The insulation layer 9 is surrounded by a hexagonal metal bushing 10, which in turn surrounds a moment transmission nut 11 below its fracture point 12. Thus, a torsional force from the nut 11 to the head 7 is transmitted by way of the metal bushing 10 and the insulation layer 9. In terms of voltage, the nut 11 is isolated from the hexagon head screw 5, 7, which functions as an actual clamping screw. However, it is possible that the moment transmission nut 11 be provided with a metallic cutout 12 for determining accurately a desired moment level.
When tightening the moment screw by turning the nut member 11 above the cut-out, the threads of the screw 5 pull the lower jaws 1 upwards through the intermediary of the elements 6, 3. The upper jaws 2 bear against the screw head 7 through the intermediary of the brace element 4. The upper jaw element and its brace element 4 are provided with a sufficiently loose hole for allowing the inclination thereof, as depicted in fig. 3. This enables the coupling of wires with varying thicknesses. The upper jaw element 2, 2 is held in a top position by means of cams 16 engaging the ends of a housing or a box 13. These cams 16 are not subjected to an actual stress but the function thereof is only to prevent the upper jaws 2 from falling down in order to enable the easy introduction of wires in between the pairs of jaws 1, 2. Reference numeral 15 designates wire openings included in the ends of the box 13. The figure only shows the top portion 13 of the box or housing. Thus, the insulation layer 9 is integral with the wide cap-shaped element 8 which closes an opening included in the top side of the terminal box 13, said opening being sufficiently large for enabling the inclination of the top half 13 of the terminal box relative to the moment screw, as depicted in fig. 3.
When the terminal or jointing clamp has been tightened in place and the nut portion 11 of the moment screw has broken at the fracture point 12, the top opening of the box 13 can be closed with a lid 14. Thus, the lid 14 cannot be placed in position until the nut 11 is broken. The joint can also be readily unclamped by removing the lid 14 and by unscrewing the nut 11 from the polygonal metal bushing 10.

Claims (5)

  1. A terminal or jointing clamp for an overhead cable, comprising two pairs of toothed jaws (1, 2) pressable against each other, a clamping screw (5) for pressing the jaws against each other, and a moment transmission nut (11) provided with a fracture point (12) for turning the clamping screw (5), characterized in that the clamping screw (5) has its head (7) in contact with the moment transmission nut (11) through the intermediary of an insulation layer (9) included between the head (7) and the nut (11).
  2. A moment screw, serving as a clamping element in a terminal or jointing clamp for a coated overhead cable and including a moment transmission nut (11) provided with a fracture point (12), characterized in that the nut (11) is coupled with a head (7) of a clamping screw (5) through the intermediary of an insulation layer (9).
  3. A terminal or jointing clamp as set forth in claim 1 or a moment screw as set forth in claim 2, characterized in that the insulation layer (9) surrounding the head (7) of the clamping screw (5) is enclosed by a polygonal metal bushing (10), which encloses also the moment transmission nut (11) below its fracture point (12).
  4. A terminal or jointing clamp as set forth in claim 1, characterized in that the insulation layer (9) is integral with a wider cap-shaped element (8) which closes an opening included in the top side of a terminal box (13), which opening enables the inclination of the top half (13) of the terminal box relative to the moment screw (5, 7, 9, 10, 11).
  5. A terminal or jointing clamp as set forth in claim 1, characterized in that the threads of the clamping screw (5) included in the moment screw are in engagement with an elongated rail (6) protruding from the bottom side of the terminal.
EP98200581A 1997-03-07 1998-02-24 Terminal or jointing clamp for a coated overhead cable and moment screw used therein Withdrawn EP0863572A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI970965A FI102120B (en) 1997-03-07 1997-03-07 The coupling piece for coated air line and torque screw used therein
FI970965 1997-03-07

Publications (2)

Publication Number Publication Date
EP0863572A2 true EP0863572A2 (en) 1998-09-09
EP0863572A3 EP0863572A3 (en) 2000-06-21

Family

ID=8548355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200581A Withdrawn EP0863572A3 (en) 1997-03-07 1998-02-24 Terminal or jointing clamp for a coated overhead cable and moment screw used therein

Country Status (13)

Country Link
EP (1) EP0863572A3 (en)
BG (1) BG63521B1 (en)
CZ (1) CZ285570B6 (en)
EA (1) EA000449B1 (en)
FI (1) FI102120B (en)
HR (1) HRP980122B1 (en)
HU (1) HU223913B1 (en)
NO (1) NO315771B1 (en)
PL (1) PL189087B1 (en)
RO (1) RO117741B1 (en)
SK (1) SK285087B6 (en)
TR (1) TR199800401A3 (en)
UA (1) UA48190C2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346490A (en) * 1999-02-04 2000-08-09 B & H Ltd Connector for live electrical conductor
ITBO20120180A1 (en) * 2012-04-04 2013-10-05 3I En S R L JUNCTION JOINT FOR UNDERGROUND CABLES
CN106099424A (en) * 2016-08-05 2016-11-09 阮浩新 A kind of penetrating cable clamp
WO2017059061A1 (en) * 2015-09-29 2017-04-06 Classic Connector, Inc. Tangent suspension accessory assembly and accessory bracket therefor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI107652B (en) * 1999-09-16 2001-09-14 Ensto Sekko Oy Dead-end clamp for insulated overhead cable
FI121692B (en) * 2009-07-27 2011-02-28 Ensto Finland Oy Connection piece for coated overhead lines
EP2607723A1 (en) 2011-12-19 2013-06-26 Ensto Finland Oy Torque nut
RU200206U1 (en) * 2020-06-17 2020-10-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Брянский государственный университет имени академика И.Г. Петровского" QUICK DISCONNECTOR FOR ROPE CONNECTION OF MOBILE ROPE COMPLEXES OF PENDULUM TYPE

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503807A1 (en) * 1981-04-13 1982-10-15 Verlant Et Beaurain Insulated tightening bolt for screw-fastening cable connectors - has shaft head with inserted hexagonal insulating plug preventing electrical contact with cable, and tightenable with allen key
EP0239428A2 (en) * 1986-03-20 1987-09-30 Verlant Et Beaurain Derivation monoblock connector, in particular for live electrical lines
FR2601516A2 (en) * 1984-06-15 1988-01-15 Sicame Sa Insulated branch connector for power cables
FR2607881A2 (en) * 1986-01-27 1988-06-10 Verlant Et Beaurain Screw with an insulated head particularly for electrical applications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503807A1 (en) * 1981-04-13 1982-10-15 Verlant Et Beaurain Insulated tightening bolt for screw-fastening cable connectors - has shaft head with inserted hexagonal insulating plug preventing electrical contact with cable, and tightenable with allen key
FR2601516A2 (en) * 1984-06-15 1988-01-15 Sicame Sa Insulated branch connector for power cables
FR2607881A2 (en) * 1986-01-27 1988-06-10 Verlant Et Beaurain Screw with an insulated head particularly for electrical applications
EP0239428A2 (en) * 1986-03-20 1987-09-30 Verlant Et Beaurain Derivation monoblock connector, in particular for live electrical lines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346490A (en) * 1999-02-04 2000-08-09 B & H Ltd Connector for live electrical conductor
GB2346490B (en) * 1999-02-04 2002-10-09 B & H Ltd Electrical connector
ITBO20120180A1 (en) * 2012-04-04 2013-10-05 3I En S R L JUNCTION JOINT FOR UNDERGROUND CABLES
WO2017059061A1 (en) * 2015-09-29 2017-04-06 Classic Connector, Inc. Tangent suspension accessory assembly and accessory bracket therefor
US10074963B2 (en) 2015-09-29 2018-09-11 Classic Connectors, Inc. Tangent suspension accessory assembly and accessory bracket therefor
CN106099424A (en) * 2016-08-05 2016-11-09 阮浩新 A kind of penetrating cable clamp

Also Published As

Publication number Publication date
RO117741B1 (en) 2002-06-28
NO981004L (en) 1998-09-08
CZ285570B6 (en) 1999-09-15
EA199800193A1 (en) 1998-10-29
HU223913B1 (en) 2005-03-29
FI970965A0 (en) 1997-03-07
PL189087B1 (en) 2005-06-30
FI102120B1 (en) 1998-10-15
PL325126A1 (en) 1998-09-14
EP0863572A3 (en) 2000-06-21
BG63521B1 (en) 2002-03-29
SK29198A3 (en) 1998-10-07
EA000449B1 (en) 1999-08-26
FI102120B (en) 1998-10-15
HUP9800489A2 (en) 1998-11-30
TR199800401A2 (en) 1999-08-23
HUP9800489A3 (en) 2000-09-28
UA48190C2 (en) 2002-08-15
CZ62798A3 (en) 1998-09-16
HRP980122A2 (en) 1998-10-31
TR199800401A3 (en) 1999-08-23
NO981004D0 (en) 1998-03-06
BG102296A (en) 1998-09-30
HRP980122B1 (en) 2007-10-31
SK285087B6 (en) 2006-06-01
HU9800489D0 (en) 1998-04-28
NO315771B1 (en) 2003-10-20

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