EP0025472B2 - Ecrou de fixation de fermeture de porte d'armoire électrique pour la fixation de fermetures en métal pour des portes d'armoire électrique - Google Patents

Ecrou de fixation de fermeture de porte d'armoire électrique pour la fixation de fermetures en métal pour des portes d'armoire électrique Download PDF

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Publication number
EP0025472B2
EP0025472B2 EP80100170A EP80100170A EP0025472B2 EP 0025472 B2 EP0025472 B2 EP 0025472B2 EP 80100170 A EP80100170 A EP 80100170A EP 80100170 A EP80100170 A EP 80100170A EP 0025472 B2 EP0025472 B2 EP 0025472B2
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EP
European Patent Office
Prior art keywords
switch box
fixing nut
tooth
door lock
box door
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.)
Expired - Lifetime
Application number
EP80100170A
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German (de)
English (en)
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EP0025472A1 (fr
EP0025472B1 (fr
Inventor
Friedhelm Runge
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to AT80100170T priority Critical patent/ATE10048T1/de
Publication of EP0025472A1 publication Critical patent/EP0025472A1/fr
Application granted granted Critical
Publication of EP0025472B1 publication Critical patent/EP0025472B1/fr
Publication of EP0025472B2 publication Critical patent/EP0025472B2/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C3/00—Fastening devices with bolts moving pivotally or rotatively
    • E05C3/02—Fastening devices with bolts moving pivotally or rotatively without latching action
    • E05C3/04—Fastening devices with bolts moving pivotally or rotatively without latching action with operating handle or equivalent member rigid with the bolt
    • E05C3/041—Fastening devices with bolts moving pivotally or rotatively without latching action with operating handle or equivalent member rigid with the bolt rotating about an axis perpendicular to the surface on which the fastener is mounted
    • E05C3/042—Fastening devices with bolts moving pivotally or rotatively without latching action with operating handle or equivalent member rigid with the bolt rotating about an axis perpendicular to the surface on which the fastener is mounted the handle being at one side, the bolt at the other side or inside the wing
    • 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
    • H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact

Definitions

  • the invention relates to a control cabinet door fastening nut for fastening metal closures for control cabinet doors, in which the closure passed through a metallic wall is grounded by electrical contact with the metallic wall.
  • Such a switch cabinet door lock fastening nut also called simply fastening nut below, is already known from DE-U-76 21 270.
  • Control cabinets are mostly made of sheet metal for safety reasons, the control cabinet door e.g. is provided with a rod lock or twist lock closure, as is already known from the aforementioned DE-U-76 21 270.
  • a rod lock or twist lock closure As is already known from the aforementioned DE-U-76 21 270.
  • an opening is punched into the sheet metal of the door leaf, through which a screw provided with an axial bore is passed, which forms a bearing for the cabinet door closing device and even by means of a nut in the Die cut can be firmly attached.
  • These locking devices can also have a square arranged within the bore, which can be rotated with a handle or key that can be plugged onto this square.
  • the lock is always in electrical contact with the metallic and thus electrically conductive door leaf, i.e. is grounded.
  • the screw provided with the hole or the associated fastening nut must be in electrical contact with the sheet metal of the door leaf.
  • Nomel disks which are fan-shaped and have on their outer edges in the one axial direction protrusions, while on the contact surface for the mother have radial, in the other axial direction protruding corrugations, which also to secure the Serve mother.
  • the etz-a (Elektrotechnische Zeitschrift), vol. 99, number 2, pages 89 to 92, furthermore DE-C-319 339 and JP-U-11031/76 each disclose toothed screws for the electrically conductive connection of two painted sheets over the paint scraping screws.
  • this nut is again unsuitable for fastening closures for control cabinet doors, since it requires relatively high compressive forces for the scratch effect to take effect, which a control cabinet door lock does not allow due to its special design, since on the one hand its wall thickness is much too small for this, and on the other hand only the space available allow very narrow fastening nuts, which therefore contain only a few threads and therefore can only absorb relatively low compressive forces.
  • the grater in order to be able to use the known nut at all for fastening the door lock in question, the grater must first be dismantled. In some embodiments this can be done by removing a screw, but in other embodiments with a fixed grater this is not possible, so that the known fastening nut cannot be used there.
  • DE-C-319 339 it is not known from DE-C-319 339 to provide both contact surfaces with teeth which are sharp in the tightening direction and have their tips protruding beyond the contact surface for scratching non-conductive layers (such as oxide layers) on the metallic wall.
  • the nut described in the Bulten-Kanthal publication has sharp edges arranged on the outer edge, which also protrude beyond the clamping surface, but has the shape of a normal machine screw and would only be a fastening screw for a control cabinet door lock according to the preamble after it has been greatly flattened. or according to DE-U-76 21 270) operational, as already described above.
  • the object of the invention is to provide a cabinet door lock fastening nut of the type mentioned, which certainly makes an earth contact to the metallic door leaf surface, is billing in production, and cannot be incorrectly assembled or forgotten.
  • control cabinet door fastening nut is also a grounding nut that both side surfaces of the Cabinet door lock fastening nut with teeth sharp in the tightening direction, with their tips protruding beyond the contact surface for scratching non-conductive layers, in particular lacquer and oxide layers on the metallic wall, in order to make electrical contact between the lateral contact surface of the control cabinet door fastening nut and the metallic wall
  • each tooth having a width which is substantially smaller than the cross-sectional width of the contact surface of the control cabinet door lock fastening nut, so that a scratched-in material receiving recess is provided in front of each tooth with respect to the tightening direction of rotation, so that each tooth is formed by a material expression that the depression occurred during the production of the material expression, and that the material expression for the simultaneous formation of the teeth and the egg Reductions are generated by a tool that can be applied obliquely in the direction of the sharpness of the tooth to be formed in the material penetr
  • the cabinet door locking nut is also the grounding means avoids the need for additional grounding means, e.g. Serrated lock washers, Nomel washers and the like, which on the one hand leads to a cheaper grounding measure, and on the other hand makes it particularly impossible to forget the grounding means.
  • additional grounding means e.g. Serrated lock washers, Nomel washers and the like
  • each tooth has a smaller width than the cross-sectional width of the contact surface of the fastening nut, the occurrence of unfavorable leakage paths is also prevented, since an annular cross-sectional area is always left, which creates a sealing effect in connection with, for example, the door coating.
  • Such fastening nuts can be produced in a single operation, although a tangential force (torque) arises due to the tangential component of the pressure force acting obliquely in the direction of sharpness, that is to say in the tangential direction, on the side surface during tooth production (oblique pressing in of tool tips) onto the fastening nut to be machined or manufactured.
  • This torque can namely be easily compensated for by the corresponding torque forces which are generated by the tool tips placed on the other side of the nut.
  • the mother then does not need to be held particularly tight (e.g. on its circumference), while the tooling devices engage the two sides of the nut (e.g. while simultaneously pressing and slightly twisting the tool halves against one another), thereby producing the teeth and indentations.
  • the material expressions are for the simultaneous formation of the teeth and the sinking gene generated by a tool that can be applied obliquely in the direction of the sharpness of the tooth to be formed penetrating into the material on the side surfaces of the fastening nut.
  • Such fastening nuts can be produced in a single operation, although a tangential force (torque) arises on the fastening nut to be machined or manufactured during tooth production (oblique pressing in of tool tips) due to the tangential component of the pressure force acting obliquely in the direction of sharpness, that is to say in the tangential direction on the side surface .
  • This torque can namely be easily compensated for by the corresponding torque forces generated by the tool tips placed on the other side of the nut.
  • radially opposite teeth are provided in the fastening nut. This is cheap because it makes the load on the nut more uniform. With the hexagon circumference of the fastening nut, it is particularly advantageous to arrange one tooth in the area of each corner.
  • the height of the tooth must be greater than the thickness of the lacquer or oxide layer, which is, for example, 50 x 10- 6 m.
  • the tooth since the tooth may be partially blunted during tightening, it is advisable to design the tooth so that it is after it Production protrudes by about 0.2 to 0.4 mm beyond the contact surface of the fastening nut.
  • the teeth are arranged spirally with a larger radial distance from tooth to tooth over at least part of the support circumference of the fastening nut, the distance differences being approximately the same or slightly smaller than the tooth width.
  • a fastening nut which has been stamped from sheet metal and / or deep-drawn has proven to be particularly advantageous.
  • Fig. 1 is a side view of a so-called rotary bolt or friction door lock, as it is often used in electrical cabinets. It consists of a lock bearing 10, in which an actuating shaft 14 having a toggle handle 12 at its free end is rotatably supported by 90 °. The angle of rotation is limited by a nose 16, which is attached to the actual grater 18 and strikes a stop at two stop surfaces 20 at the end of the bearing cylinder 10 to limit the angle of rotation.
  • the grater is fastened to the actuating shaft 14 by means of a screw 22 and slides with its grater surface 24 on a corresponding path of the door frame when the control cabinet door is closed.
  • the handle can also be removable, for example by providing a square on the actuating shaft 14 within the bearing 10, onto which a key provided with a corresponding square recess can be attached. Other embodiments such as triangular, double beard, etc. are also possible.
  • the bearing 10 and handle 12 if these consist mostly of metal, must be electrically connected to the wall panel 26 of the door leaf, so that this is not caused by a wire that is torn off inside the cabinet and is under tension, for example touching the grater 18 Bearing 10 and the handle 12 under Get tense.
  • the opposite surface 32 of the sheet 26 was scraped bare, on which the bearing surface of a fastening nut 34 comes to rest, in which the overall arrangement after being pushed through is fixed by a corresponding punching in the wall sheet 26 by screwing the nut 34 onto a corresponding thread 36 is, the bearing 10 is secured against rotation by flattenings 38 within the punched.
  • FIG. 3 shows a fastening nut 34, the two side surfaces 50 of which are provided with teeth 40 which are sharp in the tightening direction and whose tip protrudes beyond the bearing surface 50 for scratching on non-conductive layers 74 (see FIGS. 4, 5a and 5b), and so on to establish an electrical contact between the lateral contact surface 50 of the fastening nut 34 and the metallic wall, here the door leaf 26.
  • One of the several teeth 40 that are sharp in the tightening direction (usually a clockwise direction of rotation) is shown in an enlarged top view.
  • Fig. 4 and from Fig. 5a which shows a section through Fig.
  • the tooth is arranged so that it with its tip 42 when tightening the nut 34 what leads to a movement of the tooth tip 42 with respect to the sheet 26 to the right, scrapes the lacquer layer or oxide layer 44 down to the bare metal of the sheet 26, the scraped-off lacquer or oxide chips 46 expediently being able to collect in a depression 48, which is in front of the tooth tip 42 is provided, as can also be seen in FIG. 5b.
  • Tooth tip 42 and countersink 48 can be formed in a particularly favorable manner at the same time that material is thrown up with a suitable tool by pressing into the surface 50 of the nut 34 in such a way that the tip 42 results.
  • the tool could be placed obliquely in the direction of the sharpness of the tooth 42 to be formed in the surface 50 and brought to penetrate into the material, the tool simultaneously forming the depression 48 and the material throw-up 42, which automatically indicates a certain sharpness receives its top position if a suitable material is selected for nut 34.
  • Brass, hard bronze or steel are particularly suitable for this purpose.
  • a simple grain or chisel can be used, but for the cheapest possible production, a machine specially designed for this purpose is of course preferable, with which the teeth and the corresponding depressions on both sides of the fastening nut are produced simultaneously by using appropriate tools the side surfaces of the fastening nut act in, for example, only a single operation.
  • the layer 44 of varnish or oxide thin has for example a thickness of less than 50 x 10- e m, also includes the nut 34, the normally standard threaded and the other parts are made accurately, there is less than one revolution between the beginning of the scratching and the final tightening of the screw 34.
  • the side surface 50 of the fastening nut 34 approaches the surface 52 of the sheet 26 more and more, while at the same time the apex 42a becomes blunt, as shown in FIG. 5b, while the chips 46, if not in any case, move fall out of the area of the fastening nut 34 because of the vertical arrangement of the metal wall 26, collect in the depression 48.
  • the remaining blunted tip 42a will press a little into the material of the sheet 26 and not only bring about an even closer electrical contact with an even lower contact resistance, but also a locking of the fastening nut 34.
  • each tooth 40 has a smaller width 54 than the cross-sectional width 56 on the bearing surface 50 of the fastening nut 34. After all, a relatively wide area of the sheet 26 is still scratched free. For particularly hard materials, however, it may be cheaper to make the tooth 40 considerably narrower than the full width 56 of the contact surface 50 of the fastening nut 34, in order to make it even sharper Get scratching effect. In this case, it may be advantageous to arrange a plurality of teeth at radially different distances R from the axis of the nut 34, the difference in distance in each case corresponding approximately to the width 54 of the individual teeth 40 or also being slightly smaller.
  • the insulating layer 44 would be removed in strips from the individual teeth, so that after, for example, one full turn of the nut 34, the lacquer would be scraped off in a manner that would correspond to the staggered width of the teeth 40.
  • the fastening nut shown in FIG. 3 can be solid, but, as will be explained in more detail below, it can also be punched out of sheet metal and / or deep-drawn. result in considerable material savings.
  • the fastening nut will then be made of sheet steel, because steel can be machined particularly well in the form specified and sufficient stability is ensured even when thin-walled material is used.
  • the toothed fastening nut can be formed by deep drawing or pressing in one or at most two working steps.
  • the deep-drawing tools required for this are complex, but allow simple and extremely inexpensive manufacture.
  • a fastening nut according to the invention with teeth which have the shape shown in FIG. 4 can be produced simultaneously with an appropriate tool in a single operation by obliquely pressing in tool tips on both side surfaces, the tooth groups which are sharp in the tightening direction being produced simultaneously.
  • the torques created by the oblique placement essentially compensate each other, so that holding the blank is either unnecessary or requires only slight holding forces.
  • the machining forces are rather applied in that the opposing tool parts, which grip the two sides of the fastening nut, engage the fastening nut while simultaneously pressing and slightly rotating the tool halves, while simultaneously pressing out the material 42 and the depression 48 on both sides for all effect teeth to be generated simultaneously.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Elimination Of Static Electricity (AREA)
  • Lock And Its Accessories (AREA)
  • Patch Boards (AREA)

Claims (6)

1. Ecrou de fixation (34) de fermeture de porte d'armoire électrique pour la fixation de fermeture (10) en métal pour portes d'armoire électrique dans lesquelles le dispositif de fermeture (10) qui traverse une paroi métallique (26) est mis à la masse par contact électrique avec la paroi métallique (26), caractérisé en ce que l'écrou de fixation (34) de fermeture de porte d'armoire électrique est en même temps écrou de mise à la masse, en ce que les deux faces (50) de l'écrou de fixation (34) de fermeture d'armoire électrique sont munies de dents (40) aigüs dans le sens du serrage et dont la pointe fait saillie sur la face de contact (50) pour rayer des couches non conductrices (24), notamment des couches de vernis et d'oxyde, sur la paroi métallique (26), pour établir un contact électrique entre la face de contact (50) de l'écrou de fixation (34) de fermeture de porte d'armoire électrique et la paroi métallique (26) et pour ainsi rendre superflues d'autres mesures de mise à la masse, chaque dent (40) ayant une largeur (54) sensiblement plus petite que la largeur (56) de la section de la face de contact (50) de l'écrou de fixation (34) de fermeture de porte d'armoire électrique, en ce qu'en amont de chaque dent (42) par rapport au sens de serrage de chaque dent (42) est prévu un renfoncement (48) qui reçoit la matière (46) enlevée par rayure, en ce que chaque dent (40) est formée par un refoulement de matière, en ce que le renfoncement (48) est obtenu en produisant le refoulement de matière (42) et en ce que les refoulements de matière pour la formation simultanée des dents (14) et de renfoncements (48) sont produits par un outil qui, pénétrant en biais dans la matière en direction de la pointe de la dent à former (42), peut être appliqué sur les faces latérales (50) de l'écrou de fixation et en ce que plusieurs dents (40) sont disposées chacune à une autre distance radiale (R1, R2, R3) de l'axe de l'écrou.
2. Ecrou de fixation de fermeture de porte d'armoire électrique selon la revendication 1, caractérisé en ce que sont prévues des dents (40) se faisant face radialement.
3. Ecrou de fixation de fermeture de porte d'armoire électrique selon la revendication 2, caractérisé en ce que, lorsque le pourtour de l'écrou de fixation est hexagonal, une dent est disposée dans chaque angle (Figure 3).
4. Ecrou de fixation de fermeture de porte d'armoire électrique selon la revendication 1, caractérisé en ce que chaque dent (40) dépasse après sa fabrication, d'environ 0,2 à 0,4 mm au-dessus de la face de contact (50) de l'écrou de fixation (34).
5. Ecrou de fixation de fermeture de porte d'armoire électrique selon une des revendications 1 à 4, caractérisé en ce que sur au moins une partie du pourtour (5) de contact de l'écrou de fixation (34) de fermeture de porte d'armoire électrique les dents (40) sont disposées en spirale à une distance radiale R1, R2, R3 (Figure 6), les différences de distance r = R2-R1 = R3 - R2... étant sensiblement égales ou un peu inférieures à la largeur de dent (54).
6. Ecrou de fixation de fermeture de porte d'armoire électrique selon une des revendications 1 à 5, caractérisé en ce que l'écrou de fixation (34) de fermeture de porte d'armoire électrique est découpé et/ou obtenu par emboutissage profond de tôle métallique.
EP80100170A 1979-09-08 1980-01-15 Ecrou de fixation de fermeture de porte d'armoire électrique pour la fixation de fermetures en métal pour des portes d'armoire électrique Expired - Lifetime EP0025472B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80100170T ATE10048T1 (de) 1979-09-08 1980-01-15 Befestigungsmutter zur befestigung von aus metall bestehenden verschluessen fuer schaltschranktueren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2936405 1979-09-08
DE19792936405 DE2936405A1 (de) 1979-09-08 1979-09-08 Erdungsmutter

Publications (3)

Publication Number Publication Date
EP0025472A1 EP0025472A1 (fr) 1981-03-25
EP0025472B1 EP0025472B1 (fr) 1984-10-24
EP0025472B2 true EP0025472B2 (fr) 1991-07-10

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ID=6080419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100170A Expired - Lifetime EP0025472B2 (fr) 1979-09-08 1980-01-15 Ecrou de fixation de fermeture de porte d'armoire électrique pour la fixation de fermetures en métal pour des portes d'armoire électrique

Country Status (3)

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EP (1) EP0025472B2 (fr)
AT (1) ATE10048T1 (fr)
DE (2) DE2936405A1 (fr)

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DE3932939B4 (de) * 1989-10-03 2007-09-20 Dieter Ramsauer Mittels Erdungs- und/oder Befestigungsfeder in dem Durchbruch einer Blechwand, wie Schaltschranktür befestigbarer Verschluß
DE8911765U1 (de) * 1989-10-03 1991-01-31 Ramsauer, Dieter, 5620 Velbert Verschlußgehäuse mit Flansch zur Montage in einem Durchbruch einer dünnwandigen Fläche, insbesondere Blechschranktür oder Blechkastendeckel
DE4006706C2 (de) * 1990-03-03 1999-04-08 Dieter Ramsauer Vorreiberverschluß für Klappen, Seitenverkleidung, oder dgl. aus dünnem Wandmaterial
DE9105667U1 (de) * 1991-05-07 1991-07-04 Steinbach & Vollmann Gmbh & Co, 5628 Heiligenhaus Erdungsmutter
DE9310330U1 (de) * 1993-07-12 1994-11-17 DIRAK Dieter Ramsauer Konstruktionselemente GmbH & Co. KG., 58332 Schwelm Vorreiberverschluß zur Befestigung von Klappen, Seitenverkleidungen, für das Schließen von Türen o.ä., die aus elektrisch leitendem, mit oberflächlicher Isolierschicht versehenem Wandmaterial, wie lackiertem Stahlblech bestehen
DE19505227C1 (de) * 1995-02-16 1996-07-11 Schulte Gmbh & Co Kg L Erdungsmutter
DE29904771U1 (de) * 1999-03-16 1999-07-08 Emka Beschlagteile Gmbh & Co. Kg, 42551 Velbert Stangenverschluß mit Erdungseinrichtung
GB2417367A (en) * 2004-08-19 2006-02-22 Richard Henry Pearce Electrical earthing nut
GB2454643B (en) 2007-07-20 2012-02-08 Container Components Europ Ltd A Lock assembley
DE102013226768A1 (de) * 2013-12-19 2015-06-25 Vega Grieshaber Kg Mutter
CN108710059A (zh) * 2018-08-23 2018-10-26 吕清胜 一种煤矿井下人工远方漏电试验装置
CN115681288A (zh) * 2022-10-20 2023-02-03 一汽奔腾轿车有限公司 一种带接地功能的螺母与焊接螺栓配合结构及其安装方法
CN115681289A (zh) * 2022-10-20 2023-02-03 一汽奔腾轿车有限公司 一种带接地功能的焊接螺栓及其安装方法
IT202300004293A1 (it) * 2023-03-08 2024-09-08 Bticino Spa Dispositivo di collegamento per fissare e collegare elettricamente un pannello ad un quadro elettrico

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Bulten-Poroduktinformation, P1, Nr. 79 DSE, Feb. 79 †
VDE-0660, Teil 5, 11.67, Seite 35 †

Also Published As

Publication number Publication date
EP0025472A1 (fr) 1981-03-25
DE3069475D1 (en) 1984-11-29
EP0025472B1 (fr) 1984-10-24
ATE10048T1 (de) 1984-11-15
DE2936405A1 (de) 1981-03-26

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