FR2481052A1 - SUPPORT FOR ELECTROTECHNIC COMPONENTS COMPRISING CONTACT FRONT SURFACES - Google Patents

Abstract

IN THIS SUPPORT 1 FOR ELECTROTECHNICAL COMPONENTS, INCLUDING A HOLDING DEVICE IN INSULATION MATERIAL ON WHICH TWO SPRING CONTACTS 5 ARE MOUNTED, THE HOLDING DEVICE IS CONSISTED BY A BASE 4 INCLUDING TWO SLOTS 4 IN WHICH THE SPRING CONTACTS ARE FITTED 5 '' TO THE APPLICATION OF A STOP 5 OF THESE SPRING CONTACTS AGAINST THE SURFACE OF THE BASE 4, AND THE LOWER END 10 OF THE SPRING CONTACTS 5 PROJECTING BELOW THE LOWER FACE OF THE BASE, WHILE THE FREE ENDS SPRING CONTACTS 5, WHICH INCLUDE INTERNAL BULLETS 6, 9, FACING ONE OF THE OTHER OBLIGATELY, SO AS TO SECURELY BLOCK A COMPONENT TO BE PLACED IN THE HOLDING DEVICE. APPLICATION ESPECIALLY TO OVERVOLTAGE BYPASS DEVICES.

Description

2481O52

  The invention relates to a support for electrotechnical components comprising front surfaces of

  particularly for electrically fusible elements

  such as overvoltage bypass devices to be arranged on printed circuit boards,

  of the type comprising a holding device consisting of

  insulating material and on which are mounted two contacts with

  are of identical shape and located at a distance from each other, and wherein the electrical component can be inserted by means of its front surfaces, engaging the spring contacts, between the contacts to

  and, in that position, may be seized

  between these spring contacts and in which the

  Spring contacts have, at their lower ends,

  res, extensions for establishing links with

electrical connections.

  In a known support of the type indicated above (German Utility Model No. 78 16 618), inside a holding device constituted by a housing chamber are arranged the spring contacts which are formed by two bars disposed at a distance from one another and a base connecting these bars, so that the housing chamber has the shape of a U open upward. The base of housing enclosures, including

  several can be arranged in series, with

  for housing, with the possibility of snap-in

  ge, clamping contacts which usually project, from their underside, beyond the base to allow the realization of electrical connections such as welded connections on the printed circuit boards

  or the like. At the top, the contacts with

  have cut-out tabs protruding inwardly and intended to come into contact with electrical fuses, comprising

  recessed end faces, in particular

  voltage surges. The mode of constitution in the form of a housing enclosure complicates the assembly, the accessibility and the manipulation of the spring contacts, the embodiment of which is limited to components

  having recessed front surfaces.

  Surprisingly, there are already known maintenance devices for overvoltage derating devices (German Utility Model No. 68 04 494), in which a

  fixed bent contact and a spring loaded contact 4

  distance to the latter and comprising, for 'al

  frontal reception in only the surfaces properly

  contact, but also abutment pieces, which are constituted by tabs bent on their edges

  inwards spring contacts. Certainly this arrangement

  Fixing device is absolutely not suitable for use as a circuit board mount

  printed and used, instead of two contact. to stay

  same-shaped spell, two contacts cut and folded multiple ways and having different shapes and which

  require complex manufacturing and assembly

  respondents. Likewise screw fasteners are inevitable and

  the size of the fixing device is impeded;

  In order to be able to dispose of the components Yrotech-

  with different sizes in the x-dis-

  maintenance device, an adapter is already known

  Positive Gas Surge Protectors (German Utility Model No. 1 908 660) which is primarily intended for the insertion of smaller surge arresters into larger size holding devices

  important, when modernizing facilities. The adapted

  The invention consists of a box-shaped housing formed of two lateral elements in the form of identical frames, on which can be fitted, as the second pair of lateral elements, contact components folded from a sheet to constitute frames having identical box shapes, and cut at their middle portion and having resilient tongues protruding internally, in a connection of the dovetail type. Despite the form identity of the contacts

  spring-loaded devices consisting in particular of the elastic tabs

  This known adapter is a relative solution

  expensive to obtain the possibility of adapting

  of a holding device to components

  different shapes and sizes.

  Finally, there is also known a holding device for overvoltage bypass devices (German Patent No. 22 61 513), which comprises, in order to receive overvoltage bypass devices comprising a frontal contact, two identically shaped contact springs arranged in a box-shaped housing open on its end face and in which the contact springs are applied against the housing made of insulating material, in order to

  the fixing of the surfaces of the springs, which are not

  designed to contact the overvoltage

  in which only one protrudes, from the

  the middle zone of the spring contacts, the tongues

  and folded, which, in the same way as in the case of the

  known support device indicated first, are intended to

  to come into engagement with front faces set back from surge diverters. The latching inside a box-shaped housing and the necessary embodiment for this purpose contacts require

  a relatively complex form of contact, and only one

  A relatively small amount of contact is available for the establishment of the electrically conductive contacts with the surge diverter. In addition housing also requires an important place in this

embodiment.

  In relation to this state of the art the problem consists in creating a support of the type indicated above which

  (a) is universally usable, that is,

  to be suitable for receiving components with frontal contact surfaces of different shapes and sizes within a specified range of sizes and shapes, and (b) easily accessible, even in the case of compact, and take up as little space as possible, also in the case of replacement of the support and / or the component, c) can be manufactured with such a small number of components easy to manufacture and mount and possess

  overall dimensions as small as possible

and in their entirety.

  This problem is solved according to the invention by virtue of the fact that the holding device consists of a plate-shaped base comprising two slots in

  which the spring contacts can be depressed

  at the moment of application of a stop of the spring contacts against the upper face of the base, while the lower ends of the contacts protrude beyond

  the lower surface of the base, and that the upper parts

  the spring contacts turned towards each other in

  oblique position before the introduction of an electronic component

  on their inside, several respective bulges arranged so as to correspond

  the contact-oriented contour of the electronic component

  the component, after the introduction of the latter between the contact springs in order to block the component in a position defined in FIG.

  inside the holding device.

  The features of the proposed solution in

  me to the invention make it possible to

  both to solve the problem previously, in a particularly simple manner compared to the state of the art explained above. The spring contacts, whose shapes are identical and can be made by cutting, during a single operating phase, from a sheet having corresponding characteristic properties of elasticity, have on their inner faces several and in the simplest case two bulges arranged at the opening of introduction of the contact springs and which are achieved by means of a specific depression of the outer faces, possibly also by stamping, etc., and are arranged and distributed in all cases to correspond to the contour shape, located on the contact side, of the electrotechnical component. The contact faces of the latter can therefore have a frustoconical shape, a hollow cylinder shape, a

  square shape, etc. In all cases, the bulges

  component and hold it firmly. The spring contacts, which are held in the base and face obliquely before the introduction of the component, are spaced correspondingly at the introduction of the

  component, so that it develops automatically

  elastic force or clamping force, which is

  sufficient to ensure the electrically conductive

  this contact surfaces. In the end this force is also necessary to avoid a decentering of the component

  out of the position, defined by the bulges, parallel-

contact springs.

  Among the advantages of the support according to the invention, it is necessary to mention in particular its compact nature. Indeed, in the case of the use of spring contacts -lame, the length of the support is only slightly greater than the length of the electrotechnical component. In all cases

  no salient part or the like need be presented

  on the outside of the spring contacts. It suffices that the length of the base does not exceed that of the total assembly formed by the spring contacts and the electrotechnical component, when using another developed variant embodiment of the invention, according to which,

  As a stop for spring contacts, it is expected that these

  a part bent. This bent part makes it possible

  the two slots, necessary for the maintenance of the con-

  spring-loaded contacts in the base at a distance from the

  edge of the pedestal and as a result of the presence of the

  extending outwards from the slot

  the entire length of the base is again used

  for the distance between the spring contacts and in any case it is available, and for an identical constitution of the base and the same spacing between the two slots, depending on the width of the bent part, the distance

  between the two spring contacts can be adapted to

  simple to the respective length of the component to be housed. In extreme cases, the bent portion may be as wide as it extends beyond the edge of the pedestal

  and therefore the distance between the springs of

  tact, in the lower zone of the latter, is superior

re to the length of the base.

  The same adaptability is obtained for the type and arrangement of the bulges, since, for the latter, the entire surface of the spring contacts is available when, from the point of view of their embodiment, these contacts are made up under the

  form of continuous spring contacts -blade.

  From the above it follows that the support according to the invention consists of only two different parts,

  that is, the base made of insulating material and a couple of

  spring clips of the same shape. Both components have a simple shape and can be manufactured accordingly in a corresponding simple way. Similarly, the assembly is easy in the same way, since the spring contacts are inserted by their lower ends into the two slots of the base and are then pressed, under the action of a pressure, in the slots of the base of in such a way that already as a result of the clamping of the spring contacts in the slots, for a corresponding dimensioning of the two components, it is possible to obtain a sufficient fixation of the

  spring contacts in the base, without the need

  to make other arrangements.

  From the foregoing it is already apparent that the size of

248 1052

  the surface of the spring contacts does not need to

  be much of the frontal contours of the component in front of

  to be placed. Therefore, in connection with the base, one.

  gets an overall width and an overall height ex-

  very weak, so that in connection with the length

  overall low: mentioned above, we obtain a characteristic

  optimal compact size for the stand.

  The position and the embodiment of the spring contacts allow a precise limitation, while being safe, of the position of the component set up. When setting up and removing the component, only a small additional spring stroke is necessary since the bulges intended to achieve the blocking

  sure in position only protrude faintly towards the

laughing.

  It goes without saying that this new spatial form

  of a base and contact springs can easily be

  automated with the means available today.

  When the support is designed for elements

  electrotechnical fuses, such as devices for

  overvoltage, to be placed on

  circuit boards, a relatively thin wall can be retained for the base, since in this case the

  new form according to the invention uses the supplementary fixation

  the lower ends of the spring contacts, which can be plugged into the printed circuit board and can be attached thereto, and that the spring contacts do not

  are usually placed under duress only after the insertion

  support in the printed circuit board, as a result of receiving a bypass

  surges. In this case of use, the present invention

  The pedestal is used almost as an auxiliary mounting system when attaching contacts to

  springs on the printed circuit board.

  Other advantageous variants of the present invention

  will be apparent from the description given below

examples of embodiments.

  A particularly remarkable feature is, in connection with embodiments of the present

  invention, the possibility that to realize the contact tan-

  With a ring-shaped central electrode, for example a three-electrode overvoltage shunt device, an upwardly fork-shaped contact piece is arranged between the two contacts.

  and is also maintained and supported by

  clamping into an additional slot in

  the base, between the two slots, the lower end

  in the form of protruding plug-in pins, as in the case of the spring contacts, below the base and the fork-shaped part protruding above the base for the application of the branches of the fork

against the central electrode.

  In addition, for the reception of two electrotechnical components with a front contact system, a sheet can be inserted into a single support between the two spring contacts and also be fixed in a slot in the base and possibly pass through the latter. plug-in pins located on its lower end. It is then possible to keep on the sheet

  inserted a smooth surface at the level of the zone properly

  contact, the desired defined position of the electrotechnical component being obtained by means of the associated spring contact having corresponding bulges. However it is also possible to equip the sheet, on one of its faces or even on both sides, bulges of the same

  way that spring contacts. In the case of

  placed on both sides of the sheet, these bulges

  are shifted reciprocally correspondingly.

  By way of example-we have described below and illustrated

  schematically in the attached drawings several forms of

  the object of the invention.

  Figure 1 shows a side elevational view

  of a support according to the present invention, fixed by

  on a printed circuit board, and in particular comprising button-shaped bulges disposed near the upper ends of the contact and reciprocally associated contact springs as well as inwardly directed stops arranged at a distance from the

below said bulges.

  FIG. 2 represents a lateral elevational view of a type of that of FIG. 3, intended to show the maximum stroke of the springs pndanrt the introduction or

  the removal of an electrotechnical component.

  Figure 3 shows a side elevational view of the

  FIG. 1, in which an electronic component

  technique is inserted in its final position.

  FIG. 4 represents a front view, following the

  direction of the arrow A, of the support of FIG.

  Figures 5a and 5b show a front view and a sectional view of a small bulge, disposed on the

  inner surface of the contact springs and

  se in the form of an extruded button.

  Figures 6a and 6b show a front view and a sectional view of a small bulge, formed on the upper inner face of the contact springs and realized

  in the form of an extruded strip.

  Figures 7a and 7b show a front view

  and a sectional view of a small bulge, made on the

  this inner upper spring contacts and realized

  in the form of a tab obtained by cutting and re-

  thrust inwards in an oblique position.

  Figures 8, 9 and 10 show views of a

  similar to that of Figure 1, but with possible

  different connection rates from each other.

  A medium designated in general by the

  reference 1 comprises a base 4 made of an insulating material

  lant and provided with two slots 4 'arranged at a certain distance

  one another. Through the slots 4 'extend as shown, a pair of spring-shaped leaf contacts having a bent portion 5'

  at the level of the upper face 4 "of the base 4 and,

  on their inner side, bulges made in the form of buttons 6 projecting slightly to par-

  firing of the surface of the tongues 9 curved towards the interior

  and partly made by cutting from the

  surface of the spring contacts 5, the arrangement of the

  which is also visible in FIG. 4, where the outlines in the form of dashed lines have been indicated.

an electrotechnical component.

  On their upper ends, the contacts with

  fate. 5 are bent obliquely outward in order to

  facilitate the insertion of electrotechnical components 2.

  When introducing an electrotechnical component 2, of the type shown in FIG. 2 in the form of a device

  deriving overvoltages, provided with frontal surfaces of

  3, the contact springs 5 are spaced on the side on a short spring stroke, until the component 2 has reached the final position visible in FIG.

  relying on the tongues 9 protruding

  while the upper part of the component is gripped by the buttons 6. In this way, under the action of clamping or under the elastic action of the spring contacts 5 and in connection with the bulges made in the form of buttons 6 and tabs 9, the component 2 takes a definite, precisely predetermined position between the spring contacts 5, which position it retains in all

the operating conditions.

  FIGS. 5a and 5b as well as 6a and 6b and finally also FIG. 7 illustrate the fact that the bulges serving to fix the component parallel to the contacts

  spring 5 can be made very differently.

  What is essential is that the upper bulges allow easy insertion and removal of the component 2, while allowing, after the insertion of the component 2, a holding action against any inadvertent ejection in

  the opposite direction to the base 4.

  The width of the bent portion 5 'corresponds, for a predetermined spacing of the slots 4' (Figure 1), to the necessary spacing between the spring contacts 5 in which the component 2 is maintained. In this msure, there is a possibility of adaptation of the contacts 5 to

  different lengths of the component 2.

  In addition, the bent portion 5 'limits the movement

  contacts 5 upon insertion and subsequent depression.

  5 in the slots 4 'of the base 4. In order to obtain a reliable clamping action of the spring contacts to be depressed preferably over their entire width (shown in dashed lines in FIG. 4) in the slots

  4 ', the parts of the spring contacts 5, to be placed

  When in contact with the slots 4 ', they have both a width and a length that are smaller than the thickness or length of the corresponding contact parts. When the spring contacts 5 are mounted on the base 4, the spring contacts 5 are firstly plugged into the slots 4 'at their lower ends 10, which can be made in the form of plug connectors. printed circuit boards L, and during a second operating phase the recess is made

  spring contacts 5 until they come into contact with each other

  press against the 5 'bent edge on the upper side

4 "of the base 4.

  FIGS. 8, 9 and 10 clearly show that the embodiment of the support according to the invention is adaptable

  to many connection possibilities. As the

  Figures 9 and 10, the lower extremities 10 can

  can be folded laterally to make an electrically conductive connection with the corresponding antagonistic contacts. Preferably, the lower ends 10 of each spring contact 5 extend in pairs, as can be seen for example in FIGS. 3 and 4, with a view to

  to allow plugging into circuit boards im-

  L-shaped, in which they are welded as can be seen in Figure 1. As a result of their welding, the spring contacts 5 receive additional support and secure fixation against any stress or mechanical tension. Unlike known media mentioned in the introduction and having box-like housing

  or with a cross section in the shape of a U and

  carrying bars, against which the contact frame elements, which surround the contact tabs

  proper and from which these languages extend

  should be supported by the action of a contrain-

  training when receiving an electronic component

  because snapping occurs only in the base part and therefore a corresponding upper counter-support is required in the form of

  of bars, the spring contacts 5 according to the invention

  receive in the slots 4 'a secure fixation which

  also blocks said spring contacts. 5, whose

  superior is free under the effect of a constraint

  applying when setting up an electronic component

  technical. Following the transverse direction of the slots 4 ', the spring contacts. 5 are subjected over the entire length of the slots and over the entire height of the latter, to a tightening sOr intended to provide sufficient resistance to the tilting torque occurring during the stressing of the upper part of the spring contacts 5

  when setting up an electrotechnical component.

  This is also valid in the longitudinal direction

  the side of the slot since the side edges are also

  maintained with blocking against any tilting, under

  the action of the corresponding application of a pressure con-

  be the walls of the slots. So that the spring contacts 5 can be plugged, for mounting, first easily in the slots 4 'the outer spacing of the two pins

248 1052

  inserting the lower end of each

  spring contact 5 is slightly weaker than the

  In addition, the slits 4 'are slightly widened at their ends. As mentioned, this allows, during a first phase of operation, the

  of spring contacts 5 by means of an introduc-

  easy insertion of the insertion pins, following which, during a second phase of operation,

  socket 4 spring contacts 5, the parts of which

  born to engage with the walls of the slots, take their seat with tight fit in the base 4. It is preferable to the device formed of two pins of insertion to

  an embodiment having a single pin for

  chage, because of the appearance of intense impulses of

  current in the case of overvoltage devices

tensions.

  The free disposition of the spring contacts 5

  above the base 4 has the additional advantage that the parts of insulating material are, in contrast to

  known embodiments of supports, located

  away from the contacts and therefore can not be directly subjected to heat

  appearing during the operation of the deriva-

* overvoltages and can not possibly be

damaged.

  Moreover the small enlargements mentioned

  previously at the ends of the slots also serve to stabilize the injection molding tool.

  realizing the slit and to which one must confer a

  sufficient stability for precision manufacturing.

Claims (10)

  1. Support for electrotechnical components   bearing contact surfaces, in particular for   electrotechnical fusible elements, such as   overvoltage bypass devices, to be arranged on printed circuit boards, of the type comprising a holding device made of insulating material and   on which are mounted two spring contacts of identical shape   of the other, and in which the electro-technical component can be inserted between the contact springs, can be engaged by its front surfaces, with the spring contacts and, in this position can be elastically interposed between the spring contacts and in which the spring contacts have, at their lower ends, extensions   making it possible to establish connections with electrical connections   characterized in that the holding device is constituted by a plate-shaped base (4) having two slots (4 '), in which the spring contacts (5) can be depressed until the coming into force a   stop (5 ') of the spring contacts (5) against the upper face   re of the base (4), while the lower ends (10) of the spring contacts protrude below the bottom surface (4) of the base, and that the upper parts of the   spring contacts (5), facing each other in a positive   before the introduction of an electronic component.   2, have on their inner side a plurality of bulges (6, 9) arranged to correspond to the shape of the contour, located on the contact side, of the component   electrotechnical system (2), said bulges enclosing   equipped with the component (2), after insertion between the spring contacts (5) in order to lock it in a defined position in the holding device.   2. Support according to claim 1, characterized in that the spring contacts (5) comprise, as a   as a stop, a bent part of variable width. 248 1052   3. Support according to one of claims 1 or 2,   characterized in that for use in   printed circuit pads L, it comprises a base (4) with a relatively thin wall, and that the spring contacts (5) receive an additional fixing as a result of the welding of their lower ends (10) in the printed circuit board L.   4. Support according to any one of the claims   1 to 3, characterized in that the bulges are constituted by at least two projecting projections in the form of buttons arranged at a certain distance from each other   close to the upper opening of the contacts to spell (5).   5. Support according to any one of the claims   1 to 4, characterized in that the bulges in the lower part of the spring contacts are partially formed by tongues (9) made by cutting from the surface of the spring contacts (5) and projecting obliquely towards inside and that are arranged   at a certain distance from each other.   6. Support according to any one of the claims   1 to 5, characterized in that the parts, coming   contact with the base (4) in the final position of the con-   spring clips (5) in said base, are fixed by means of   tightened in the slots (4 ') of the base (4) and that the slots (4') are given dimensions which differ slightly from the dimensions of the corresponding parts of the spring contacts (5).   7. Support according to any one of the claims   1 to 6, characterized in that the spring contacts   have the shape of leaf springs essentially   gular and possibly rounded and whose lower ends (10) extend downwards with a shape of   fork at their outer parts.   8. Support according to any one of the claims   1 to 7, characterized in that, in order to make the tangential contact with a ring-shaped central electrode, for example a three-electrode overvoltage shunt device, a contact piece open towards the   high and fork-shaped is arranged between the two   spring clips (5) and is also held by means of a clamping fixture and is supported in an additional slot in the base (4) and located between them. two slots (4 '), the lower end of the plug-in-part, protruding below the base (4), while the fork-shaped part protrudes above the base (4) so that the branches   fork apply against the center electrode.   9. Support according to any one of the claims   1 to 8, characterized in that, for the reception of two components (2) with establishment of a front contact, a plate is inserted between the two spring contacts (5) and is also fixed in a slot of the base ( 4) and   optionally extends through the base (4) via   insert pins at the lower end of the pool.   -10. Support according to claim 9, characterized in that the plate has on one or both sides bulges having a similar embodiment   two provided on the spring contacts (5).