EP0988665A1 - Water tight connecting terminal for a coated overhead cable - Google Patents

Water tight connecting terminal for a coated overhead cable

Info

Publication number
EP0988665A1
EP0988665A1 EP98925663A EP98925663A EP0988665A1 EP 0988665 A1 EP0988665 A1 EP 0988665A1 EP 98925663 A EP98925663 A EP 98925663A EP 98925663 A EP98925663 A EP 98925663A EP 0988665 A1 EP0988665 A1 EP 0988665A1
Authority
EP
European Patent Office
Prior art keywords
conductor
teeth
clamp
terminal
slots
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.)
Granted
Application number
EP98925663A
Other languages
German (de)
French (fr)
Other versions
EP0988665B1 (en
Inventor
Tuomas Antikainen
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 EP0988665A1 publication Critical patent/EP0988665A1/en
Application granted granted Critical
Publication of EP0988665B1 publication Critical patent/EP0988665B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R4/24—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

Definitions

  • the present invention relates to a watertight terminal for a coated overhead cable, comprising two face-to-face adaptable jaw elements provided with conductor slots for wires to be joined, and slots transverse to the conductor slots for metallic clamp elements, as well as liners partially surrounding the clamp elements, said clamp element being provided, in line with the conductor slots, with conductor-insulation piercing teeth which, upon clamping the terminal, emerge from within the liner while the liner compresses against the conduc- tor insulation around the piercing point of the teeth.
  • Such a terminal is known e.g. from Patent publications DE-3, 715,529 and DE- 3,824,741.
  • An object of the invention is to provide a terminal of the above-mentioned type, wherein the foregoing problems have been eliminated in a structurally simple manner.
  • fig. 1 shows a terminal of the invention in a lateral view
  • fig. 2 shows a bottom portion of the terminal in a plan view
  • fig. 3 shows a section taken along a line Ill-Ill in fig. 2;
  • fig. 4 shows a section taken along a line IV-IV in fig. 2;
  • fig. 5 shows a top portion of the terminal in a view from below
  • fig. 6 shows a section taken along a line VI-VI in fig. 5;
  • fig. 7 shows a section taken along a line VII-VII in fig. 5;
  • fig. 8 shows a metallic clamp element used in the terminal in a lateral and a plan view
  • fig. 9 shows a clamp element fitted together with a rubber liner in a slot present in a jaw element
  • fig. 10 shows separately a clamp element and a rubber liner on top of the same;
  • fig. 11 shows a section taken along a line XI-XI in fig. 10;
  • fig. 12 shows a section taken along a line XII-XII in fig. 10;
  • fig. 13 shows the terminal of fig. 10 along with its rubber liner in a lateral view facing the teeth and
  • fig. 14 shows a cross-section of an aluminium profile used for making the clamp elements of the invention by punching the profile in two down the middle in the area between teeth 14.
  • the terminal shown in fig. 1 comphses a lower jaw element 1 and an upper jaw element 2.
  • the jaw element 1 includes two parallel conductor slots 3, 5 and the jaw element 2 includes, in respective positions, two parallel conductor slots 4, 6.
  • the jaw elements are clamped together by means of a screw, not shown, which extends through a central hole present in the jaw elements (holes 9 and 10 in figs. 2 and 3).
  • the lower jaw element 1 of the terminal has its structure depicted in more detail in figs. 2-4.
  • the jaw element is provided with slots 7, transverse to the conductor slots 3, 5 and extending to the area of the conductor slots and intended for receiving metallic clamp elements 13 provided with teeth 14 in line with the conductor slots 3, 5.
  • the teeth 14 pierce the conductor insulation and establish a contact.
  • the upper jaw element 2 has its structure shown in more detail in figs. 5-7.
  • the clamp elements 13 are provided with receiving slots 8 which run crosswise relative to the conductor slots 4, 6 and extend between the conductor slots 4, 5 in such a manner that the teeth 14 of the clamp elements 13 accom- modated in the slots 8 find their way to conductors present in the slots 4, 6 and establish a joint contact between the conductors.
  • the flanks of the jaw element 2 are provided with downward projecting claws 12, which settle against the side faces of the jaw element 1 and, thus, guide the jaw elements 1 and 2 into the alignment with each other.
  • the slots 7, 8 have a width near the bottom of the slots, which slightly exceeds that of the body portion of the clamp element 13.
  • the flanks of the slots 7, 8 are provided with small bosses 17, 18 for eliminating the clearance resulting from the difference in widths.
  • the slot 7, 8 has a top portion which diverges in a wedge-shaped manner and receives the skirt portion 15c of a respectively wedge-like diverging liner 15, as depicted in more detail in figs. 9-12.
  • the rubber liner 15 has its ends provided with expansions 15a and 15b, inside which are the teeth 14 of the clamp element 13.
  • a wire presses against the trough surfaces of the expansions 15a and 15b while the teeth 14 emerge from inside the rubber liner and pierce the conductor insulation.
  • the trough surfaces of the expansions 15a and 15b constitute a sealing around the piercing point.
  • moisture may penetrate into the joint through a gap between the clamp element 13 and the rubber liner 15, resulting in a corrosion hazard and deterioration of the joint contact as well as a risk of conductor damage.
  • Another problem is to control the penetration depth of the teeth 14, regardless of hardness fluctuations of a conductor insulation e.g. at various temperatures.
  • the flanks of the clamp elements 13 are provided in the invention with elongated bosses 16, which are inside the liner 15.
  • the bosses 16 are located near the base area of the teeth 14 so as to resist excessive penetration of the teeth 14 into the conductor.
  • the bosses 16 improve the sealing surrounding the clamp element 13.
  • the bosses improve the sealing between the clamp element 13 and the liner 15, as the bosses 16 press the liner 15 against the wedge-shaped flanks of the slot 7 or 8.
  • the material for the clamp elements 13 comprises some electrically highly conductive metal or metal alloy.
  • the clamp elements 13 can be readily made e.g. from aluminium profile, having e.g. a cross-section which is shown in fig.
  • the teeth 14 of the clamp elements 13 and the areas therebetween are produced by punching out the necessary pieces off the edge of the profile.
  • the use of aluminium is a way of eliminating a corrosion hazard. If the terminal is used for jointing copper conductors, the teeth 14 must be coated with an appropriate metal. However, this type of terminals are generally used for joining aluminium conductors.

Landscapes

  • Cable Accessories (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Detergent Compositions (AREA)
  • Cosmetics (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The invention relates to a water tight terminal for a coated overhead cable, comprising two face-to-face adaptable jaw elements (1, 2) provided with conductor slots (3, 4; 5, 6) for wires to be joined, and slots (7, 8) transverse to the conductor slots for metallic clamp elements (13), as well as liners (15) partially surrounding the clamp elements. The clamp element (13) is provided, in line with the conductor slots, with conductor-insulation piercing teeth (14) which, upon clamping the terminal, emerge from within the liner (15) while the liner (15) compresses against the conductor insulation around the piercing point of the teeth (14). The flanks of the clamp elements (13) are provided with elongated bosses (16) remaining at least partially inside the liner near the base area of the teeth (14), arranged such that the bosses (16) resist excessive penetration of the teeth into the conductor and at the same time improve the sealing surrounding the clamp element (13).

Description

WATER TIGHT CONNECTING TERMINAL FOR A COATED OVERHEAD CABLE
The present invention relates to a watertight terminal for a coated overhead cable, comprising two face-to-face adaptable jaw elements provided with conductor slots for wires to be joined, and slots transverse to the conductor slots for metallic clamp elements, as well as liners partially surrounding the clamp elements, said clamp element being provided, in line with the conductor slots, with conductor-insulation piercing teeth which, upon clamping the terminal, emerge from within the liner while the liner compresses against the conduc- tor insulation around the piercing point of the teeth.
Such a terminal is known e.g. from Patent publications DE-3, 715,529 and DE- 3,824,741.
One problem with this type of terminals is the adaptation of a clamping force in such a way that the teeth of clamp elements certainly penetrate to a sufficient depth into a conductor, yet not too deep so as to cause mechanical damage to the conductor, i.e. to cut it partially off. This has been done by means of moment screws used for tightening the jaw elements towards each other. There is a problem, however, that at varying temperatures the force required for piercing a conductor insulation varies considerably. Thus, the correct penetration depth for the teeth cannot be controlled by means of a moment screw alone.
Another problem is the provision of sufficiently good tightness. Even if the liner should compress tightly against the conductor insulation around the teeth, there still remains a risk that moisture will be able to work its way into the joint through a gap between the clamp element and the liner. Because the clamp element must be provided with a mechanical bearing, the liner cannot surround the clamp element completely in the area of clamp element bearing surfaces.
An object of the invention is to provide a terminal of the above-mentioned type, wherein the foregoing problems have been eliminated in a structurally simple manner.
This object is achieved by means of the invention on the basis of the characterizing features defined in the appended claim 1. Preferred embodiments of the invention are set forth in the non-independent claims.
One exemplary embodiment of the invention will now be described in more detail with reference made to the accompanying drawings, in which
fig. 1 shows a terminal of the invention in a lateral view;
fig. 2 shows a bottom portion of the terminal in a plan view;
fig. 3 shows a section taken along a line Ill-Ill in fig. 2;
fig. 4 shows a section taken along a line IV-IV in fig. 2;
fig. 5 shows a top portion of the terminal in a view from below;
fig. 6 shows a section taken along a line VI-VI in fig. 5;
fig. 7 shows a section taken along a line VII-VII in fig. 5;
fig. 8 shows a metallic clamp element used in the terminal in a lateral and a plan view;
fig. 9 shows a clamp element fitted together with a rubber liner in a slot present in a jaw element;
fig. 10 shows separately a clamp element and a rubber liner on top of the same; fig. 11 shows a section taken along a line XI-XI in fig. 10;
fig. 12 shows a section taken along a line XII-XII in fig. 10;
fig. 13 shows the terminal of fig. 10 along with its rubber liner in a lateral view facing the teeth and
fig. 14 shows a cross-section of an aluminium profile used for making the clamp elements of the invention by punching the profile in two down the middle in the area between teeth 14.
The terminal shown in fig. 1 comphses a lower jaw element 1 and an upper jaw element 2. The jaw element 1 includes two parallel conductor slots 3, 5 and the jaw element 2 includes, in respective positions, two parallel conductor slots 4, 6. The jaw elements are clamped together by means of a screw, not shown, which extends through a central hole present in the jaw elements (holes 9 and 10 in figs. 2 and 3).
The lower jaw element 1 of the terminal has its structure depicted in more detail in figs. 2-4. The jaw element is provided with slots 7, transverse to the conductor slots 3, 5 and extending to the area of the conductor slots and intended for receiving metallic clamp elements 13 provided with teeth 14 in line with the conductor slots 3, 5. When clamping the terminal, the teeth 14 pierce the conductor insulation and establish a contact.
Respectively, the upper jaw element 2 has its structure shown in more detail in figs. 5-7. The clamp elements 13 are provided with receiving slots 8 which run crosswise relative to the conductor slots 4, 6 and extend between the conductor slots 4, 5 in such a manner that the teeth 14 of the clamp elements 13 accom- modated in the slots 8 find their way to conductors present in the slots 4, 6 and establish a joint contact between the conductors. The flanks of the jaw element 2 are provided with downward projecting claws 12, which settle against the side faces of the jaw element 1 and, thus, guide the jaw elements 1 and 2 into the alignment with each other.
The slots 7, 8 have a width near the bottom of the slots, which slightly exceeds that of the body portion of the clamp element 13. The flanks of the slots 7, 8 are provided with small bosses 17, 18 for eliminating the clearance resulting from the difference in widths. Hence, the clamp element 13 can be readily pushed to bear firmly against the bottom of the slot 7, 8 and the clamp element remains straight and does not tilt aside during the course of clamping or tightening the terminal. The slot 7, 8 has a top portion which diverges in a wedge-shaped manner and receives the skirt portion 15c of a respectively wedge-like diverging liner 15, as depicted in more detail in figs. 9-12.
The rubber liner 15 has its ends provided with expansions 15a and 15b, inside which are the teeth 14 of the clamp element 13. When clamping the terminal, a wire presses against the trough surfaces of the expansions 15a and 15b while the teeth 14 emerge from inside the rubber liner and pierce the conductor insulation. The trough surfaces of the expansions 15a and 15b constitute a sealing around the piercing point. However, moisture may penetrate into the joint through a gap between the clamp element 13 and the rubber liner 15, resulting in a corrosion hazard and deterioration of the joint contact as well as a risk of conductor damage. Another problem is to control the penetration depth of the teeth 14, regardless of hardness fluctuations of a conductor insulation e.g. at various temperatures. In order to overcome these problems, the flanks of the clamp elements 13 are provided in the invention with elongated bosses 16, which are inside the liner 15. The bosses 16 are located near the base area of the teeth 14 so as to resist excessive penetration of the teeth 14 into the conductor. At the same time, the bosses 16 improve the sealing surrounding the clamp element 13. In particular, the bosses improve the sealing between the clamp element 13 and the liner 15, as the bosses 16 press the liner 15 against the wedge-shaped flanks of the slot 7 or 8. In view of the sealing function, it is essential that the bosses 16 extend over the entire length of the clamp elements 13. In view of the clamping moment take-up function, it is sufficient that the bosses 16 be located at least in line with the base area of the teeth 14.
The material for the clamp elements 13 comprises some electrically highly conductive metal or metal alloy. The clamp elements 13 can be readily made e.g. from aluminium profile, having e.g. a cross-section which is shown in fig.
14. The teeth 14 of the clamp elements 13 and the areas therebetween are produced by punching out the necessary pieces off the edge of the profile. The use of aluminium is a way of eliminating a corrosion hazard. If the terminal is used for jointing copper conductors, the teeth 14 must be coated with an appropriate metal. However, this type of terminals are generally used for joining aluminium conductors.

Claims

Claims
1. A watertight terminal for a coated overhead cable, comprising two face-to- face adaptable jaw elements (1,2) provided with conductor slots (3, 4; 5, 6) for wires to be joined, and slots (7, 8) transverse to the conductor slots for metallic clamp elements (13), as well as liners (15) partially surrounding the clamp elements, said clamp element (13) being provided, in line with the conductor slots, with conductor-insulation piercing teeth (14) which, upon clamping the terminal, emerge from within the liner (15) while the liner (15) compresses against the conductor insulation around the piercing point of the teeth (14), characterized in that the flanks of the clamp elements (13) are provided with elongated bosses (16) remaining at least partially inside the liner near the base area of the teeth (14), arranged such that the bosses (16) resist excessive penetration of the teeth into the conductor and at the same time improve the sealing surrounding the clamp element (13).
2. A terminal as set forth in claim 1, characterized in that the clamp element take-up slot (7, 8) has a width which slightly exceeds the bottom width of the clamp element (13) near the bottom of the slot (7, 8), wherein the flanks of the slot (7, 8) are provided with small bosses (17, 18) for eliminating the clearance resulting from said difference in widths, and that the slot (7, 8) has a top portion which diverges in a wedge-like fashion and receives a skirt portion (15c) of the respectively wedge-like diverging liner.
3. A terminal as set forth in claim 1 or 2, characterized in that the bosses (16) of the clamp elements (13) extend over the entire length of the clamp elements (13).
4. A terminal as set forth in any of claims 1-3, characterized in that the clamp elements (13) are made from aluminium profile.
EP98925663A 1997-06-13 1998-06-10 Water tight connecting terminal for a coated overhead cable Expired - Lifetime EP0988665B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI972505A FI101912B1 (en) 1997-06-13 1997-06-13 Waterproof connection for coated air cable
FI972505 1997-06-13
PCT/FI1998/000499 WO1998059392A1 (en) 1997-06-13 1998-06-10 Water tight connecting terminal for a coated overhead cable

Publications (2)

Publication Number Publication Date
EP0988665A1 true EP0988665A1 (en) 2000-03-29
EP0988665B1 EP0988665B1 (en) 2002-04-17

Family

ID=8549040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98925663A Expired - Lifetime EP0988665B1 (en) 1997-06-13 1998-06-10 Water tight connecting terminal for a coated overhead cable

Country Status (9)

Country Link
EP (1) EP0988665B1 (en)
AT (1) ATE216535T1 (en)
AU (1) AU7768698A (en)
EE (1) EE9900569A (en)
FI (1) FI101912B1 (en)
HU (1) HUP0002793A2 (en)
NO (1) NO996084D0 (en)
PL (1) PL337332A1 (en)
WO (1) WO1998059392A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934490A1 (en) * 1979-08-25 1981-04-09 Firma Richard Bergner, 8540 Schwabach Connector for insulated wires - has sharp edges for biting through insulation and provided with moisture sealing faces
FR2634070B1 (en) * 1988-07-07 1991-05-10 Sicame Sa INSULATED CONNECTOR FOR ELECTRICAL CABLES

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9859392A1 *

Also Published As

Publication number Publication date
AU7768698A (en) 1999-01-04
WO1998059392A1 (en) 1998-12-30
FI101912B (en) 1998-09-15
HUP0002793A2 (en) 2000-12-28
EP0988665B1 (en) 2002-04-17
FI101912B1 (en) 1998-09-15
NO996084L (en) 1999-12-09
NO996084D0 (en) 1999-12-09
ATE216535T1 (en) 2002-05-15
PL337332A1 (en) 2000-08-14
FI972505A0 (en) 1997-06-13
EE9900569A (en) 2000-08-15

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