EP0471922A2 - Elément fusible - Google Patents

Elément fusible Download PDF

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Publication number
EP0471922A2
EP0471922A2 EP91107076A EP91107076A EP0471922A2 EP 0471922 A2 EP0471922 A2 EP 0471922A2 EP 91107076 A EP91107076 A EP 91107076A EP 91107076 A EP91107076 A EP 91107076A EP 0471922 A2 EP0471922 A2 EP 0471922A2
Authority
EP
European Patent Office
Prior art keywords
axis
cavity
shield
fuse element
housing
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Withdrawn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
EP91107076A
Other languages
German (de)
English (en)
Other versions
EP0471922A3 (en
Inventor
Heinrich Rohrer
Werner Staubli
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.)
Schurter AG
Original Assignee
Schurter AG
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 Schurter AG filed Critical Schurter AG
Publication of EP0471922A2 publication Critical patent/EP0471922A2/fr
Publication of EP0471922A3 publication Critical patent/EP0471922A3/de
Withdrawn legal-status Critical Current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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/143—Electrical contacts; Fastening fusible members to such 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H2085/0414—Surface mounted fuses
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H2085/383—Means for extinguishing or suppressing arc with insulating stationary parts
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses

Definitions

  • the invention relates to a securing element according to the preamble of claim 1.
  • Fuse elements of this type which are primarily referred to as fuse links, which are also called fuse links, are known in many designs. Particularly when such fuse elements are small, there is a pronounced need to design them to be arc-resistant. Because of their small size, the conventional means are largely unsuitable for this. Although the known fuse elements can sometimes have very small dimensions, they are not practical for use as SMD fuse elements.
  • connection legs also called “pin”
  • pad soldering field
  • the invention has for its object to provide a fuse element which, despite its very small dimensions, is designed to be arc-resistant, and is suitable as an SMD for SMT, whereby in addition to small dimensions, suitability for both soldering methods, high operational reliability and economy, high arc-inhibiting ability in the foreground stands. It was also part of the task that this fuse element can be manufactured fully automatically and should also be usable for the automatic assembly of printed circuit boards.
  • the characteristic construction of the fuse element makes it possible to use it for SMT and to completely automate its manufacture.
  • the arc-resistant shielding can also be provided in the simplest way even in the case of automatic production.
  • the shield extends into each of the two flat sections protruding outwards from the associated pipe section in the direction of the axis.
  • the shielding is designed as a tube, which connects the two tube sections and consists of insulating material, in particular an unbroken tube.
  • the shield consists at least partially and preferably entirely of a plastic, in particular of polytetrafluoroethylene.
  • This shield is provided in the form of a polytetrafluoroethylene tube or tube with dense walls. It is all the more astonishing that this achieves the best success, as it has always been thought until now that the corresponding materials should be porous or even granular.
  • the housing can be easily and automatically manufactured with conventional plastic precision using plastic injection molding technology, and the tubes can already be injected if necessary. If one prefers not to inject the tubes because this can involve a certain amount of effort, one can only manufacture the housing and, at the appropriate time, feed it to a device for assembling the securing element.
  • the tubes can be provided with the arc-inhibiting shield before inserting them into the housing if desired, although it is currently preferred to provide this shield later.
  • the fuse wire can then be drawn in automatically and the tubes flattened to clamp the fuse and possibly also the ends of the shield.
  • the flat sections obtained can then be automatically bent to the solder legs.
  • the securing elements obtained in this way, packed in tapes, blisters and magazines, etc., can be fed to the assembly devices for print production, where automatic assembly can take place.
  • the flat sections are preferably arranged outside the housing and preferably have a part running in the direction of the axis, which part Pipe section is adjacent.
  • Appropriate mounting of the pipe section can prevent an undesired deformation of the pipe sections from occurring when the flat sections are pressed flat. Such undesirable deformations could in fact adversely affect the connection to the housing.
  • the pipe sections and the flat sections close the cavity largely to completely tightly. Due to its arc-inhibiting effect, the shield naturally also has an arc-quenching effect, which is why the special porous arc-extinguishing agents, whether granular or paper-like, can be dispensed with. This is of course particularly advantageous for small elements.
  • the flat section in particular in the area of the clamping point, advantageously protrudes axially from the pipe section along a certain, usually small distance, before it runs bent off the axis.
  • the shield can also be clamped here without causing any difficulties. You can then e.g. hold the end contact up to this point during bending so that the bending forces are not transferred to the pipe section in the housing.
  • solder legs from the two flat sections are practically unlimited, but two practically proven solder leg shapes are preferred, of which one is Z-like and the other is C-like. In the case of the C-like shape of the solder legs, the size of the radius of curvature allows a more or less pronounced spring behavior and / or a certain degree of dilation compensation to be achieved. Both forms of solder legs are suitable for both soldering processes.
  • the inventive production of a The securing element according to the invention or preferred can be made by producing a housing, in the cavity ends of which one of the two still very tubular end contacts is inserted.
  • the shield in particular the shield tube, is inserted.
  • a fuse element is drawn into the cavity and into the tubes within the shield; the two flat sections are then formed by flattening a part of each tube; one of the fusible conductor ends is clamped in a clamping point. If necessary, the shield can also be clamped. Now you will bend at least a part of the flat section of each of the two tubes out of the axis and form solder legs from them.
  • the first embodiment of the securing element 1 shown in FIGS. 1 to 4 has a housing 2 which extends along the axis A and is made of suitable insulating material, such as, for example, plastic, ceramic and the like.
  • a metal end contact 3 is inserted in each of the two cavity ends 22.
  • the two end contacts 3 are electrically conductively connected to one another by a fusible conductor 4 located on the axis A of the housing 2.
  • Each of the two end contacts 3 sits with its tube section 31 firmly in the cavity end 22 in question.
  • the attachment can be carried out in a manner known per se, for example by gluing, clamping, overmolding and the like.
  • the pipe section 31 gradually merges into the flat section 33 via the transition section 32.
  • One of the two ends 51 of the shield 5 is clamped in the first flat section part 330 of each end contact 3.
  • the clamping point 34 then follows, where one fuse element end 41 is attached to the end contact 3 in an electrically conductive manner.
  • the flat sections 33 then form the solder legs 35. While the clamping point 34 is still on the axis A, the solder legs 35 are bent out of the axis A.
  • each of the two end contacts 3 projects outside the cavity 21 in the direction of the axis A, and is easily accessible to a gripping member for squeezing (not shown).
  • Each of the two clamping points 34 is shown in FIG shown squeezed state in which it both mechanically holds a fuse element end 41 of the fuse element 4 and also connects the end contacts 3 to one another in an electrically conductive manner through the fuse element 4.
  • the complete covering of the inner surface 310 of the tube sections 31 is provided by the tubular shield 5, the ends 51 of which are closed in the corresponding clamping regions 330 around the fuse element 4.
  • This shield is provided in the form of a polytetrafluoroethylene tube or tube with dense walls. It is all the more astonishing that this achieves the best success, as it has always been thought until now that the corresponding materials have to be porous or even granular.
  • the tube sections 31 are flush with the shoulders 23, so that they run flush with the inside of the central cavity region 26, which greatly facilitates the retraction of the shield 5 and the fusible conductor 4 during manufacture.
  • the flat section 33 is then formed into a solder leg 34 at the clamping point 34.
  • the soldering leg 34 is first bent out at right angles from the axis A in the direction of the underside 24 of the housing 2, to the wave soldering area 37, in order then to form the reflow soldering area 38 in a recess 25 in the underside 23 of the housing 2, parallel to the axis A, the two areas 37 and 38 together form a soldering section 36 of the soldering leg 35.
  • the recesses 25 ensure that the reflow soldering areas 38 are protected in the housing 2, but protrude from the underside 24 to such an extent that they are at a certain distance from a printed circuit board 5 indicated by dot-and-dash lines, which is an adhesive Can offer space.
  • the second embodiment of the securing element 1A according to FIG. 5 differs only in a different configuration of the solder legs 35A, the soldering sections 36A of which are each bent away from the housing 2 and form the wave soldering area 37A and the reflow soldering area 38A there. For this reason, only the transfer symbols just mentioned have been given in FIG. 5.
  • the first embodiment of the securing element 1 can be produced as follows: The previously made, plastic housing 2 has an axis A, to which the cavity extends coaxially. With appropriate clamping fit, the end contacts 3, which are still in the form of small tubes, are pushed along the axis up to the shoulders 23 of the cavity ends 22 without an air gap, and the shield 5 and the fusible conductor 4 are drawn in. The fusible conductor ends 41 and the shielding ends 51 are clamped in the clamping points 34 and 330 of the flat sections 33. These flat sections 33 are produced by flattening the tubes. By bending the flat sections 33, the soldering legs 35 are produced and thus the securing element 1 of FIGS. 1 to 4 is reached. A somewhat different bending would allow the securing element 1A to be reached.

Landscapes

  • Fuses (AREA)
EP19910107076 1990-08-20 1991-05-02 Fuse element Withdrawn EP0471922A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2696/90 1990-08-20
CH269690 1990-08-20

Publications (2)

Publication Number Publication Date
EP0471922A2 true EP0471922A2 (fr) 1992-02-26
EP0471922A3 EP0471922A3 (en) 1992-06-24

Family

ID=4239537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910107076 Withdrawn EP0471922A3 (en) 1990-08-20 1991-05-02 Fuse element

Country Status (3)

Country Link
US (1) US5140294A (fr)
EP (1) EP0471922A3 (fr)
JP (1) JPH05135686A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3447786A1 (fr) * 2017-08-22 2019-02-27 LEONI Bordnetz-Systeme GmbH Élément de sécurité électrique

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5281169A (en) * 1993-01-21 1994-01-25 Molex Incorporated Shielded electrical connector assemblies
DE19930996A1 (de) * 1999-07-05 2001-01-18 Bosch Gmbh Robert SMD-Bauteil mit planaren Kontaktflächen und Verfahren zur Erzeugung planarer Flächen für SMD-Anschlußbeine
CN101401181B (zh) * 2006-03-16 2011-06-15 松下电器产业株式会社 表面安装型电流熔断器
DE102008003659A1 (de) * 2007-03-26 2008-10-02 Robert Bosch Gmbh Schmelzsicherung zur Unterbrechung eines spannungs- und/oder stromführenden Leiters im thermischen Fehlerfall und Verfahren zur Herstellung der Schmelzsicherung
US8937524B2 (en) * 2009-03-25 2015-01-20 Littelfuse, Inc. Solderless surface mount fuse
DE102013213949A1 (de) * 2013-07-16 2015-02-19 Robert Bosch Gmbh Sicherung mit Trennelement
CN104241059A (zh) * 2014-09-18 2014-12-24 江苏科兴电器有限公司 一种带屏蔽功能的高压熔断器
US10283307B2 (en) * 2017-04-05 2019-05-07 Littelfuse, Inc. Surface mount fuse
CN115621099A (zh) * 2022-11-11 2023-01-17 南京萨特科技发展有限公司 一种芯片式熔断器及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH566641A5 (fr) * 1972-12-20 1975-09-15 Schurter Ag H
NL8501004A (nl) * 1985-04-04 1986-11-03 Littelfuse Tracor Smeltveiligheid.
US4646053A (en) * 1985-12-30 1987-02-24 Gould Inc. Electric fuse having welded fusible elements
FR2596918A1 (fr) * 1986-04-04 1987-10-09 Telemecanique Electrique Dispositif fusible limiteur de courant
CH675034A5 (fr) * 1987-11-03 1990-08-15 Schurter Ag
US4894633A (en) * 1988-12-12 1990-01-16 American Telephone And Telegraph Company Fuse Apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3447786A1 (fr) * 2017-08-22 2019-02-27 LEONI Bordnetz-Systeme GmbH Élément de sécurité électrique
US10553383B2 (en) 2017-08-22 2020-02-04 Leoni Bordnetz-Systeme Gmbh Electrical fuse element

Also Published As

Publication number Publication date
US5140294A (en) 1992-08-18
JPH05135686A (ja) 1993-06-01
EP0471922A3 (en) 1992-06-24

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