EP0627754A1 - Dispositif de protection contre les courants de surcharge avec connexion directe d'un fusible à une extrémité de câble - Google Patents

Dispositif de protection contre les courants de surcharge avec connexion directe d'un fusible à une extrémité de câble Download PDF

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Publication number
EP0627754A1
EP0627754A1 EP93203711A EP93203711A EP0627754A1 EP 0627754 A1 EP0627754 A1 EP 0627754A1 EP 93203711 A EP93203711 A EP 93203711A EP 93203711 A EP93203711 A EP 93203711A EP 0627754 A1 EP0627754 A1 EP 0627754A1
Authority
EP
European Patent Office
Prior art keywords
contact
box
case
termination
fuse
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Withdrawn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
EP93203711A
Other languages
German (de)
English (en)
Inventor
Antonio Falchetti
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.)
Meccanotecnica Codognese SpA
Original Assignee
Meccanotecnica Codognese SpA
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 Meccanotecnica Codognese SpA filed Critical Meccanotecnica Codognese SpA
Publication of EP0627754A1 publication Critical patent/EP0627754A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/203—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals
    • H01H85/2035—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals for miniature fuses with parallel side contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H2085/2075—Junction box, having holders integrated with several other holders in a particular wiring layout
    • H01H2085/208—Junction box, having holders integrated with several other holders in a particular wiring layout specially adapted for vehicles

Definitions

  • the present invention relates to a protective arrangement against current overloading, with direct fuse coupling to a cable termination, particularly for motor vehicle electric systems. It is a known fact that prior art electric systems for motor vehicles, automobiles, trucks, tricars, and self-propelled construction machines, are provided with a capillary protection of their electric functions using fuses housed in a fuse box so as to form an electric power distribution unit.
  • the distribution unit is powered through a cable of appropriate conduction cross-section, and in turn powers, in cascade through a plurality of fuses having a suitable amperage, a plurality of electric apparatus, such as headlights, tail lights, parking lights, fans, windshield wipers, etc.
  • the fuse ahead operates to prevent dangerous overheating and destruction of the protected apparatus while also providing protection from fire hazard.
  • the distribution units employed provide reasonable but not full protection from such hazard.
  • the vehicle electric system includes a multiplicity of large supply cables extending ahead of the distribution unit and being unprotected from shorts.
  • These cables are basically arranged to connect the battery to the electric starter, the junction box, and the charging alternator.
  • the cables In a manner related to the specially large loads they are to power, the cables have large cross-sections, and are kept permanently live and usually left unprotected.
  • an electric contact resulting from a crimping operation (that is, crimping to strain) for applying cable terminals to cable conductors has a very low and negligible contact resistance, and after an initial settling period substantially unvarying conductivity over time, an electric contact provided by clamps has a much higher resistance and, what is more important, considerable variability over time, especially in the presence of vibration and temperature variations apt to result in gradual loosening and decreased contact pressure.
  • the voltage drop brought about by intervening safety apparatus is due not only to the contacts between fuse terminations and connectors in the fuse housing box but also to the connections between the fuse housing box and the supply cables.
  • the problem is intensified by that the protections must be installed in the engine compartment, wherein the ambient temperature may attain large values to be estimated at 80°C by accepted standards.
  • the supply parallel is integral with the friction contacts for the fuses.
  • the friction contacts for the fuses are constructed to provide a flat terminal with a friction contact having three pressure spots opposedly arranged to ensure a large surface area of contact with both faces of the flat terminal, and therefore, minimal contact resistance.
  • the pressure contacts for the fuses are housed removably within a fuse housing box to allow not only removal of a fuse but also removal of the pressure contacts for inspection and servicing as required, as well as easier installation of same.
  • the cable terminals which form the friction contacts for the fuses are, when made removable, protected by an insulating shell to prevent their removal from the fuse box from causing unintentional shorting to metal parts of the vehicle.
  • the contact between the elements 3, 4 and the cables is not a direct one, but obtained instead with the interposition of cable terminals 7, 8, usually made of either phosphor bronze or copper and crimped onto the cable, and friction fitted over terminations 9, 10 of the contact elements 3, 4.
  • terminals 7, 8 of the eyelet type may be connected to the terminations 9, 10 by a clamp screw.
  • the fuse shown in Figure 1 is a cylinder type with conductive ends, but it should be appreciated that the scheme would apply to fuses of another type just as well.
  • the diagram shows that in powering a load through the protection arrangement, voltage drop and power dissipation appear in four areas, namely:
  • Figure 2 shows schematically the protection arrangement forming the subject matter of the present invention; the cables 5, 6, or at least one of them, are/is terminated with suitably shaped crimp-on terminals, housed within the fuse carrier 2, which directly form friction contacts with the terminals of the fuse 1.
  • the contact resistance between the terminations and the connector can be minimized.
  • Figure 3 shows schematically a protection arrangement wherein a plurality of fuses 11, 12, 13, 14 are supplied from a paralleling element 15 which itself forms terminations 16, 17, 18, 19 of contact with one terminal of the fuses, the other terminal of the fuses being in contact with a termination 20, 21, 22, 23 of one from a plurality of distribution cables 24, 25, 26, 27.
  • the paralleling element 15 is provided with an eyelet 28 for screw coupling to an eyelet terminal of a supply cable.
  • Figure 4 is an exploded perspective view of a preferred embodiment of a cable termination for direct coupling to a fuse terminal.
  • the latter is preferably a blade fuse commensurate to the current flow involved of about 40 to 100 A.
  • the cable termination basically consists of a prismatic element formed by bending from a flat sheet blank, preferably of phosphor bronze or more generally a material with high electric conductivity, which has a rectangular wall 27, two sides 28, 29, and a contact comb 30 opposite to the wall 27 and suitably S-shaped to provide a lead-in for insertion of a fuse terminal, between the wall 27 and the comb 30.
  • the insertion e.g. of the terminal 31 of the fuse shown schematically at 32, is effected along the arrow direction.
  • Punched through the sides 28, 29 are openings 31, 32, 33, 34 intended for receiving engagement teeth which are dimpled out of corresponding sides 35, 36 of a bias element 37 made of stainless steel, for example, which is also provided with an elastic pressure comb 38 effective, in the coupled condition of the bias element to the termination, to exert a suitable pressure on the reeds of the comb 30 to have them pressed against the wall 27.
  • the remote end of the prismatic termination from the inserted one is fashioned into two securing tabs 39, 40 which are crimped, one onto the conductive end of the cable and the other onto the insulating cable sleeve, thereby ensuring a stable electric contact of negligible resistance, strong, and unaffected by vibration and temperature changes.
  • Figure 5 shows in perspective the completed cable termination, as viewed along a different direction from that of Figure 4 to bring out a dimpled contact area 42 in the wall 27.
  • This area provides a stable contact surface opposite to the contact comb 30.
  • a tooth 41 is dimpled out which is intended to engage the cable termination to an insulating protection case.
  • This case may be formed directly in the fuse carrier, or may be an insulating protection case removable from the fuse carrier.
  • Figure 6 is a side view of a cable 43 termination, of the same type as previously described, an insulating protection case 44, shown in section, and a locking element 45.
  • the protection case 44 is made of an insulating material such as a reinforced plastics and comprises a prismatic element with a square or rectangular cross-sectional shape containing a first prismatic housing 51 with a rectangular cross-sectional shape for the termination 43 and a second prismatic housing 52 with a rectangular cross-sectional shape for the locking element 45.
  • the two housings are separated by a diaphragm 46 on which a spring tab 47 is formed which has engagement teeth 48.
  • the diaphragm 46 has a recess 49 on its side facing the housing for the locking element 45.
  • the termination 43 is inserted along the arrow 50 direction into the housing 51 until its end comes to bear onto a shoulder stop 53 in the case.
  • the raised tooth 41 will interfere with the tooth 48 causing the tab 47 to deform elastically toward the housing 52.
  • the locking element 45 is fitted, along the arrow 54 direction, into the housing 52, wherein it will be retained by at least one pip 55 carried on a spring tab 56 of the element 45 snapping into the recess 49.
  • the locking element 45 once inserted into the housing, will prevent the tab 47 from being deflected toward the housing 52 and ensure unreleasable engagement of the two teeth 41, 48.
  • a wall of the case 44 has an opening 56, or just a recess, adapted to provide a seat with engagement edge for a serrated element, similar to the tab 47, which would be provided preferably on a socket formed in the body of a fuse carrier intended to receive the insulating case 44 and to house one or more fuses and more cable terminations.
  • the case 44 is preferably provided, on an outward wall thereof, with an elongate rib 57 for keying the insertion of the case into its corresponding socket in the fuse carrier.
  • the insulating case 44 prevents the termination 43 from inadvertently contacting metal parts in the event of the case 44 becoming separated from the fuse carrier.
  • Figure 7 shows an exploded perspective view of a fuse carrier assembly for accommodating four fuses powered from a paralleling element.
  • the assembly comprises a body 60 made of a reinforced plastics material provided with a plurality of openings 61, 62 ... 68, each to receive a fuse terminal such as 69 and located opposite to an inner housing (similar to that of the case 44 in Figure 6), not shown, which is to receive a cable termination through a lower opening.
  • Those terminations which are to confront the openings 62, 63, 66, 67 and all connected together, are formed in pairs from a one-piece element which provides the uninterrupted parallel between the terminations 71, 72 and 73, 74, respectively.
  • connection element between the terminations 75, 76, respectively is bent to an "L" and provided with an opening 77, 78 adapted to receive a clamp screw 79 which co-operates with a nut 80, having a thread-out preventing gasket, to firmly clamp the two connection elements 75, 76 together and to an eyelet cable termination 81.
  • the cable termination 81 is preferably soldered to the cable 82 and protected by a heat-shrinkable sleeve excepting at the end eyelet.
  • the cable terminations such as 70 or paralleling element terminations such as 71, 72, 73, 74 are irreversibly inserted into the body 60 and isolated by the latter from one another.
  • housings are provided for locking elements such as 83 of the type described, inserted into the body 60 through the openings 84, 85, 86, 87.
  • a single locking element can lock two terminations.
  • An upper cover 88 provided with snap engagement devices and a sealing gasket, not shown, provides protection for the fuses, and once applied, also ensures their correct positioning.
  • a lower cover 89 provided with devices for engagement with the body 60 protects the cable terminations and the paralleling elements.
  • fuse carrier assemblies may be provided wherein one or more cable terminations, as protected by cases like those shown in Figure 6, are removable, whereas other terminations, as provided with paralleling elements (such as 75, 76) for example, are fixed.
  • the lower cover for enclosing and protecting the terminations may be suitably shaped not to enclose the removable terminations, which can then be removed without removing the cover.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Fuses (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
EP93203711A 1993-06-04 1993-12-28 Dispositif de protection contre les courants de surcharge avec connexion directe d'un fusible à une extrémité de câble Withdrawn EP0627754A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI931191 1993-06-04
ITMI931191A IT1271576B (it) 1993-06-04 1993-06-04 Sistema di protezione da sovraccarico di corrente con accoppiamento diretto di fusibile a terminazione di cavo

Publications (1)

Publication Number Publication Date
EP0627754A1 true EP0627754A1 (fr) 1994-12-07

Family

ID=11366341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93203711A Withdrawn EP0627754A1 (fr) 1993-06-04 1993-12-28 Dispositif de protection contre les courants de surcharge avec connexion directe d'un fusible à une extrémité de câble

Country Status (2)

Country Link
EP (1) EP0627754A1 (fr)
IT (1) IT1271576B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903766A3 (fr) * 1997-09-18 2000-07-26 Grote & Hartmann GmbH & Co. KG Boíte à fusibles
WO2004012216A1 (fr) * 2002-07-30 2004-02-05 Tyco Eletro-Eletronica Ltda. Boite a relais a fusible et procede de fabrication

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2210003A1 (fr) * 1972-12-08 1974-07-05 Rists Wires & Cables Ltd
DE2358314B2 (de) * 1973-11-23 1978-09-07 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal Sicherungsdose
US4238140A (en) * 1979-03-01 1980-12-09 Ford Motor Company Terminal block with electrical connection means with connector location wall and locking finger
DE8028942U1 (de) * 1980-10-30 1987-06-25 Hermann Stribel KG, 7443 Frickenhausen Sicherungseinrichtung
DE8902868U1 (de) * 1989-03-09 1989-08-24 Kao, Kun-Yao, Taipeh/T'ai-pei Sicherungshalter
EP0356106A2 (fr) * 1988-08-19 1990-02-28 Molex Incorporated Ensemble fusible additionnel
EP0508059A2 (fr) * 1991-04-08 1992-10-14 MECCANOTECNICA CODOGNESE S.p.A. Boîte de porte-fusible ayant une structure modulaire
US5257951A (en) * 1991-08-26 1993-11-02 Yazaki Corporation Electrical connecting device for automotive vehicle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2210003A1 (fr) * 1972-12-08 1974-07-05 Rists Wires & Cables Ltd
DE2358314B2 (de) * 1973-11-23 1978-09-07 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal Sicherungsdose
US4238140A (en) * 1979-03-01 1980-12-09 Ford Motor Company Terminal block with electrical connection means with connector location wall and locking finger
DE8028942U1 (de) * 1980-10-30 1987-06-25 Hermann Stribel KG, 7443 Frickenhausen Sicherungseinrichtung
EP0356106A2 (fr) * 1988-08-19 1990-02-28 Molex Incorporated Ensemble fusible additionnel
DE8902868U1 (de) * 1989-03-09 1989-08-24 Kao, Kun-Yao, Taipeh/T'ai-pei Sicherungshalter
EP0508059A2 (fr) * 1991-04-08 1992-10-14 MECCANOTECNICA CODOGNESE S.p.A. Boîte de porte-fusible ayant une structure modulaire
US5257951A (en) * 1991-08-26 1993-11-02 Yazaki Corporation Electrical connecting device for automotive vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903766A3 (fr) * 1997-09-18 2000-07-26 Grote & Hartmann GmbH & Co. KG Boíte à fusibles
WO2004012216A1 (fr) * 2002-07-30 2004-02-05 Tyco Eletro-Eletronica Ltda. Boite a relais a fusible et procede de fabrication
US6848946B2 (en) 2002-07-30 2005-02-01 Tyco Eletro-Eletronica Ltda. Electrical fuse realy box, apparatus, method and article of manufacture

Also Published As

Publication number Publication date
ITMI931191A0 (it) 1993-06-04
IT1271576B (it) 1997-05-30
ITMI931191A1 (it) 1994-12-04

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Effective date: 19950608