EP0537038B1 - Self-locking tension clamp for straightening deformed car parts - Google Patents

Self-locking tension clamp for straightening deformed car parts Download PDF

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Publication number
EP0537038B1
EP0537038B1 EP19920402519 EP92402519A EP0537038B1 EP 0537038 B1 EP0537038 B1 EP 0537038B1 EP 19920402519 EP19920402519 EP 19920402519 EP 92402519 A EP92402519 A EP 92402519A EP 0537038 B1 EP0537038 B1 EP 0537038B1
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EP
European Patent Office
Prior art keywords
chain
back portions
recesses
clamp
traction
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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
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EP19920402519
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German (de)
French (fr)
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EP0537038A1 (en
Inventor
Pierre Legrand
Jean-Marie Marxer
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Blackhawk SA
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Blackhawk SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/14—Straightening frame structures
    • B21D1/145—Clamps therefor

Definitions

  • the invention relates to a traction assembly according to the preamble of claim 1, adapted to allow recovery operations on bodywork elements deformed by accident.
  • the traction clamp is connected to the associated traction chain by means of rings, hooks, loops or other accessories, retained by the clamp.
  • the clamping of the clamp on the sheet is generally done, either by screws, or by a clamping cone trapped in the clamp (see for example the document US-A-3.355.777).
  • connection of the chain to the clamp imposes in practice the formation of a loop at the end of the chain, which induces a twisting of this chain end, detrimental to the mechanical strength of this chain.
  • the absence of a loop in document US-A-3,355,777 runs the risk of inadvertent disengagement of the chain hook from the tightening cone.
  • the object of the invention is to overcome the aforementioned drawbacks and therefore in particular to allow a significant reduction in the aforementioned minimum transverse distance, while simplifying the coupling between clamp and chain, without introducing any twisting of the latter.
  • this object is achieved by a traction unit as defined in claim 1.
  • Figure 1 shows how to straighten, conventionally, a deformed body element denoted C, using a conventional clamp 1 and a chain 2.
  • This element C has a sheet edge R taken between the teeth 3 of two jaws 4 cross-coupled to each other by retaining rods here formed of screws 5 and nuts 6.
  • Each jaw has the overall shape of a C with a first end 7 provided on its edge with the abovementioned teeth 3 and a second end 8.
  • the jaws have their concavities turned towards one another, and are generally symmetrical with respect to a confrontation plane marked P, transverse to the screws 5 and parallel to the edges provided with teeth 3.
  • the second ends 8 are inclined relative to the plane P and converge towards the outside of the clamp 1.
  • This bar 9 is integral with a ring 10 through which passes an end section of the chain 2, which ends in a hook 11.
  • This chain 2 is often engaged on a deflection pulley, shown diagrammatically at 12, intended to allow that the tensile force on the chain can be exerted in any direction relative to in plane P, which is particularly advantageous when the rim R on which it is desired to pull is in an area which is not very accessible (for example when it is necessary to pull downwards, on an element situated in the lower part of a box of vehicle).
  • Figure 2 shows a traction assembly according to the invention.
  • the clamp is designated as a whole by the reference 21; it is shown in more detail in FIGS. 3 to 8.
  • the clamp 21 is formed, like the clamp 1 of Figure 1, of two jaws generally C-shaped, coupled to each other by retaining rods, here formed of screws 23 carrying nuts 24, in a configuration in which the concavities of the two jaws are turned towards one another.
  • Each jaw in C has a first end, noted 25 in FIGS. 3, and 5 to 7, the edge 25A of which is provided with hooking teeth 25 ′, here inclined at an angle approximately equal to 30 °, and a second end 26.
  • the screws 23 are closer to the first ends than to the second ends.
  • the jaws 22A and 22B are substantially symmetrical to each other with respect to the plane P of confrontation of the toothed edges of the jaws, at least in this respect, concerns their concave faces. In fact, these concave faces are the same. On the other hand, their outer faces are differentiated by the fact that one, 22A, of the jaws comprises two notches 27 at the bottom of which open holes 28 for the screws 23 and each bordered by two opposite flanks 29 and 29 ′ apart d equal to the width of the hexagon head 30 of the screws 23 thanks to which the latter are locked in rotation.
  • each jaw here the jaw 22A
  • the jaw 22A has on its concave face, between the ends 25 and 26, more precisely between the holes 28 for the screws and the second end 26, a thick plate 31, here forming an integral part of the jaw, and in which are formed imprints.
  • the second end 26 is interrupted in the middle in a zone 26A, in which the plate therefore extends over the entire thickness of this second end.
  • a first notch 32 extends transversely at the ends 25 and 26, from the central zone where the second end is interrupted as far as between the bores 28.
  • this first notch has a bottom, comprising a central portion 32A mistletoe is substantially parallel to the flat surface of the plate 31 and an inclined portion 32B extending, here with an angle of about 30 ° relative to the flat surface of the plate, from this central portion 32A and the central zone where the second end 26 is interrupted.
  • a second notch 33 is arranged at right angles to the first notch 32, that is to say parallel to the first and second ends 25 and 26.
  • This second notch has a bottom comprising a central portion 33A coplanar with the central portion 32A of the bottom of the first cut 32 and two inclined surfaces 33B and 33C extending, here at an angle of about 30 ° relative to the flat surface of the plate, from this central portion to immediate proximity to the flat surface of said plate .
  • At least a third notch 34 (there are two here) can be arranged in the extension of the second notch, having a profile in a portion of a circle (see FIG. 7).
  • the first and second cuts jointly form a kind of cross.
  • the clamp 21 makes it possible to very significantly reduce the minimum clearance L ′ necessary for the positioning of the clamp with the chain and a deflection pulley.
  • FIG. 9 represents a traction regime on the chain, with an inclination of the rest of the chain relative to the links 2A (not visible) and 2B.
  • FIG. 10 shows yet another traction regime applied to the chain, the end link (not visible) being trapped in the second facing impressions.
  • a tensile force on this end section parallel to the ends 25 and 26 here also causes, by wedge effect with the inclined portions 33B or 33C, the clamping of the sections 25A towards one another.
  • the link (noted 2C) of the chain located opposite the link 2A relative to the link 2B does not penetrate, in the example of this figure 10, in the clamp in which case the third fingerprints 34 can be deleted.
  • the third notches 34 serve in fact to accommodate, if necessary, part of such a link 2C in larger clamps parallel to the ends 25 and 26.
  • a single cavity 34 may be sufficient (as may be inclined portions 33B or 33C only) but the presence of the two notches 34 makes it possible to arrange the chain in one direction or the other, in the traction regime of FIG. 10.
  • the regime of Figure 10 allows to exert longitudinal forces on the rim R of the element to be straightened while the regime of Figure 9 allows to exert bias forces.

Description

L'invention concerne un ensemble de traction selon le préambule de la revendication 1, adaptée à permettre des opérations de redressement sur des éléments de carrosserie déformés par accident.The invention relates to a traction assembly according to the preamble of claim 1, adapted to allow recovery operations on bodywork elements deformed by accident.

Dans les ensembles de traction existants, la pince de traction est reliée à la chaîne de traction associée par l'intermédiaire d'anneaux, crochets, boucles ou autres accessoires, retenus par la pince. Le serrage de la pince sur la tôle se fait généralement, soit par des vis, soit par un cône de serrage emprisonné dans la pince (voir par exemple le document US-A-3.355.777).In existing traction assemblies, the traction clamp is connected to the associated traction chain by means of rings, hooks, loops or other accessories, retained by the clamp. The clamping of the clamp on the sheet is generally done, either by screws, or by a clamping cone trapped in the clamp (see for example the document US-A-3.355.777).

Ces pinces connues ont l'inconvénient d'imposer une distance transversale minimale non négligeable (typiquement de l'ordre de 0,6 m) entre, d'une part, le point de fixation de la pince sur un rebord de tôle de l'élément déformé, et, d'autre part, un point dans lequel on peut dévier la chaîne par une poulie, de manière à pouvoir tirer librement sur cette chaîne lorsque le rebord précité se trouve être d'accès malaisé (cas du bas d'une joue d'aile, ou d'un bas de caisse ...).These known clamps have the disadvantage of imposing a non-negligible minimum transverse distance (typically of the order of 0.6 m) between, on the one hand, the point of attachment of the clamp on a sheet flange of the deformed element, and, on the other hand, a point in which the chain can be deflected by a pulley, so as to be able to freely pull on this chain when the abovementioned flange is found to be difficult to access (case of the bottom of a cheek of wing, or rocker ...).

En outre, la liaison de la chaîne à la pince impose en pratique la formation d'une boucle à l'extrémité de la chaîne, ce qui induit un vrillage de cette extrémité de chaîne, préjudiciable à la tenue mécanique de cette chaîne. L'absence de boucle dans le document US-A-3.355.777 fait courir des risques de désengagement intempestif du crochet de la chaîne vis-à-vis du cône de serrage.In addition, the connection of the chain to the clamp imposes in practice the formation of a loop at the end of the chain, which induces a twisting of this chain end, detrimental to the mechanical strength of this chain. The absence of a loop in document US-A-3,355,777 runs the risk of inadvertent disengagement of the chain hook from the tightening cone.

L'invention a pour objet de pallier les inconvénients précités et donc notamment de permettre une réduction notable de la distance transversale minimale précitée, tout en simplifiant, l'attelage entre pince et chaîne, et ce sans introduire de vrillage de cette dernière.The object of the invention is to overcome the aforementioned drawbacks and therefore in particular to allow a significant reduction in the aforementioned minimum transverse distance, while simplifying the coupling between clamp and chain, without introducing any twisting of the latter.

Selon l'invention, ce but est atteint par un ensemble de traction tel que défini dans la revendication 1.According to the invention, this object is achieved by a traction unit as defined in claim 1.

Selon des dispositions préférées de l'invention, éventuellement combinées :

  • les entailles sont disposées transversalement aux premières et secondes extrémités, les portions de fond inclinées convergeant l'une vers l'autre dans des zones où les secondes extrémités sont interrompues,
  • les entailles sont disposées parallèlement aux premières et secondes extrémités,
  • les portions de fond inclinées sont prévues dans le prolongement des portions de fond de part et d'autre de celles-ci,
  • une troisième entaille est prévue dans le prolongement mais à distance de chaque première entaille pour recevoir une partie d'un maillon parallèle à ce maillon terminal de la chaîne,
  • dans les plateaux sont ménagées deux secondes entailles en regard disposées transversalement aux premières entailles, comportant de secondes portions de fond parallèles et de secondes portions de fond inclinées convergeant l'une vers l'autre à partir de ces secondes portions de fond parallèles, les portions de fond parallèles des premières et secondes entailles étant coplanaires, ces secondes entailles formant conjointement un second logement pour le maillon terminal de la chaîne,
  • les plateaux sont situés entre les tiges de retenue et les secondes extrémités.
According to preferred arrangements of the invention, possibly combined:
  • the notches are arranged transversely at the first and second ends, the inclined bottom portions converging towards one another in areas where the second ends are interrupted,
  • the notches are arranged parallel to the first and second ends,
  • the inclined bottom portions are provided in the extension of the bottom portions on either side thereof,
  • a third notch is provided in the extension but at a distance from each first notch to receive part of a link parallel to this end link of the chain,
  • in the plates are made two second facing notches arranged transversely to the first notches, comprising second parallel bottom portions and second inclined bottom portions converging towards each other from these second parallel bottom portions, the portions parallel bottom of the first and second notches being coplanar, these second notches jointly forming a second housing for the end link of the chain,
  • the trays are located between the retaining rods and the second ends.

Des objets, caractéristiques et avantages de l'invention ressortent de la description qui suit, donnée à titre d'exemple, en regard des dessins annexés sur lesquels :

  • la figure 1 est une vue schématique d'un système de traction classique, à pince autoserrante classique,
  • la figure 2 est une vue schématique d'un ensemble de traction conforme à l'invention, celle-ci étant vue en coupe selon la ligne III-III de la figure 4,
  • la figure 3 est une vue agrandie de la pince autoserrante de l'ensemble de traction de la figure 2, dans laquelle est emprisonné un maillon de chaîne,
  • la figure 4 est une vue en élévation de cette pince, selon la flèche IV de la figure 3,
  • la figure 5 est une vue en coupe, selon la même ligne de coupe que pour les figures 2 et 3, d'un des mors de cette pince,
  • la figure 6 est une vue interne de ce mors selon la flèche VI de la figure 5,
  • la figure 7 est une vue de dessus de ce mors selon la flèche VII de la figure 5,
  • la figure 8 est une vue partielle des dents inclinées de ce mors, selon la ligne VIII-VIII de la figure 6,
  • la figure 9 est une vue similaire à la figure 4, montrant une variante du régime de traction appliqué à la pince, et
  • la figure 10 est une vue similaire à la figure 4, montrant une variante de montage d'une chaîne dans cette pince, correspondant à une autre variante du régime de traction appliqué.
Objects, characteristics and advantages of the invention appear from the following description, given by way of example, with reference to the appended drawings in which:
  • FIG. 1 is a schematic view of a conventional traction system, with a conventional self-clamping clamp,
  • FIG. 2 is a schematic view of a traction assembly according to the invention, the latter being seen in section along line III-III of FIG. 4,
  • FIG. 3 is an enlarged view of the self-tightening clamp of the traction assembly of FIG. 2, in which a chain link is trapped,
  • FIG. 4 is an elevation view of this clamp, according to arrow IV of FIG. 3,
  • FIG. 5 is a sectional view, along the same section line as for FIGS. 2 and 3, of one of the jaws of this clamp,
  • FIG. 6 is an internal view of this jaw according to the arrow VI of FIG. 5,
  • FIG. 7 is a top view of this jaw according to arrow VII of FIG. 5,
  • FIG. 8 is a partial view of the inclined teeth of this jaw, along the line VIII-VIII of FIG. 6,
  • FIG. 9 is a view similar to FIG. 4, showing a variant of the traction regime applied to the clamp, and
  • Figure 10 is a view similar to Figure 4, showing a variant of mounting a chain in this clamp, corresponding to another variant of the traction regime applied.

La figure 1 montre comment redresser, de façon classique, un élément de carrosserie déformé noté C, grâce à une pince 1 classique et une chaîne 2. Cet élément C comporte un rebord de tôle R pris entre les dents 3 de deux mors 4 attelés transversalement l'un à l'autre par des tiges de retenue ici formées de vis 5 et d'écrous 6.Figure 1 shows how to straighten, conventionally, a deformed body element denoted C, using a conventional clamp 1 and a chain 2. This element C has a sheet edge R taken between the teeth 3 of two jaws 4 cross-coupled to each other by retaining rods here formed of screws 5 and nuts 6.

Chaque mors a globalement la forme d'un C avec une première extrémité 7 munie sur sa tranche des dents 3 précitées et une seconde extrémité 8. Les mors ont leurs concavités tournées l'une vers l'autre, et sont globalement symétriques par rapport à un plan d'affrontement repéré P, transversal aux vis 5 et parallèle aux tranches munies de dents 3. Les secondes extrémités 8 sont inclinées par rapport au plan P et convergent vers l'extérieur de la pince 1.Each jaw has the overall shape of a C with a first end 7 provided on its edge with the abovementioned teeth 3 and a second end 8. The jaws have their concavities turned towards one another, and are generally symmetrical with respect to a confrontation plane marked P, transverse to the screws 5 and parallel to the edges provided with teeth 3. The second ends 8 are inclined relative to the plane P and converge towards the outside of the clamp 1.

A l'intéieur de cette pince 1 est engagé un barreau allongé 9 de forme trapézoïdale isocèle, dont les flancs longent les extrémités inclinées 8 des mors.Inside this clamp 1 is engaged an elongated bar 9 of isosceles trapezoidal shape, whose flanks run along the inclined ends 8 of the jaws.

Ce barreau 9 est solidaire d'un anneau 10 au travers duquel passe un tronçon terminal de la chaîne 2, qui est terminé par un crochet 11. Cette chaîne 2 est souvent engagée sur une poulie de déviation, schématisée en 12, destinée à permettre que l'effort de traction sur la chaîne puisse être exercé dans une direction quelconque par rapport au plan P, ce qui est particulièremen avantageux lorsque le rebord R sur lequel on veut tirer est dans une zone peu accessible (par exemple lorsque l'on doit tirer vers le bas, sur un élément situé dans la partie basse d'une caisse de véhicule).This bar 9 is integral with a ring 10 through which passes an end section of the chain 2, which ends in a hook 11. This chain 2 is often engaged on a deflection pulley, shown diagrammatically at 12, intended to allow that the tensile force on the chain can be exerted in any direction relative to in plane P, which is particularly advantageous when the rim R on which it is desired to pull is in an area which is not very accessible (for example when it is necessary to pull downwards, on an element situated in the lower part of a box of vehicle).

La présence de l'anneau 10, et la nécessité de prévoir une boucle pour fixer la chaîne à l'anneau impose pour l'ensemble pince-chaîne-poulie un encombrement parallèlement au plan P, admettant une valeur minimale notée L, valant environ 5 fois la longueur l de la pince, typiquement de l'ordre de 0,6 m dans la pratique.The presence of the ring 10, and the need to provide a loop for fixing the chain to the ring requires for the chain-pulley-pulley assembly a space requirement parallel to the plane P, admitting a minimum value noted L, being worth approximately 5 times the length l of the clamp, typically of the order of 0.6 m in practice.

En fonctionnement, une traction sur la chaîne 2 se répercute en une traction du barreau 9 vers l'extérieur de la pince 1 ce qui, par effet de coin, tend à écarter les extrémités inclinées 8 des mors, et donc, par effet de levier par rapport aux tiges de retenue (vis 5 et écrous 6), un rapprochement forcé des tranches dentées : la pince se serre ainsi d'autant plus sur le bord de tôle R que l'effort de traction sur la chaîne est important.In operation, a traction on the chain 2 is reflected in a traction of the bar 9 towards the outside of the clamp 1 which, by wedge effect, tends to spread the inclined ends 8 of the jaws, and therefore, by leverage compared to the retaining rods (screws 5 and nuts 6), a forced approximation of the toothed edges: the clamp is thus tightened all the more on the edge of sheet metal R as the tensile force on the chain is high.

La figure 2 montre un ensemble de traction conforme à l'invention.Figure 2 shows a traction assembly according to the invention.

La pince est désignée dans son ensemble par la référence 21 ; elle est représentée plus en détail par les figures 3 à 8.The clamp is designated as a whole by the reference 21; it is shown in more detail in FIGS. 3 to 8.

On peut toutefois noter, dès cette figure 2, que la chaîne 2 est directement attelée à cette pince, par son maillon terminal 2A (il n'y a plus besoin de crochet 11) qui est emprisonné dans la pince 21. On appréciera que l'encombrement minimal transversal du système de traction, noté L′, est sensiblement réduit par rapport au cas de la figure 1, à environ 3 fois seulement la longueur de la pince (ici notée l′ par cohérence avec la référence l de la figure 1, les longueurs l et l′ pouvant être égales). On notera d'autre part que l'attelage de la chaîne à la pince se fait sans le moindre vrillage de cette chaîne.It can however be noted, from this figure 2, that the chain 2 is directly coupled to this clamp, by its terminal link 2A (there is no longer any need for a hook 11) which is trapped in the clamp 21. It will be appreciated that the transverse minimum size of the traction system, denoted L ′, is appreciably reduced compared to the case in FIG. 1, to only about 3 times the length of the clamp (here denoted l ′ for consistency with the reference l in FIG. 1 , the lengths l and l ′ being able to be equal). It will also be noted that the coupling of the chain to the clamp is done without the slightest twisting of this chain.

Ainsi qu'il ressort des figures 3 à 8, la pince 21 est formée, comme la pince 1 de la figure 1, de deux mors globalement en forme de C, attelés l'un à l'autre par des tiges de retenue, ici formées de vis 23 portant des écrous 24, dans une configuration dans laquelle les concavités des deux mors sont tournées l'une vers l'autre.As is apparent from Figures 3 to 8, the clamp 21 is formed, like the clamp 1 of Figure 1, of two jaws generally C-shaped, coupled to each other by retaining rods, here formed of screws 23 carrying nuts 24, in a configuration in which the concavities of the two jaws are turned towards one another.

Chaque mors en C comporte une première extrémité, notée 25 aux figures 3, et 5 à 7, dont la tranche 25A est munie de dents d'accrochage 25′, ici inclinées d'un angle environ égal à 30°, et une seconde extrémité 26. Les vis 23 sont plus proches des premières extrémités que des secondes extrémités.Each jaw in C has a first end, noted 25 in FIGS. 3, and 5 to 7, the edge 25A of which is provided with hooking teeth 25 ′, here inclined at an angle approximately equal to 30 °, and a second end 26. The screws 23 are closer to the first ends than to the second ends.

Les mors 22A et 22B sont sensiblement symétriques l'un à l'autre par rapport au plan P d'affrontement des tranches dentées des mors, au moins en ce gui concerne leurs faces concaves. En fait, ces faces concaves sont mêmes identiques. Par contre, leurs faces extérieures se différencient par le fait que l'un, 22A, des mors comporte deux entailles 27 au fond desquelles débouchent des perçages 28 pour les vis 23 et bordées chacune par deux flancs en regard 29 et 29′ d'écartement d égal à la largeur de la tête à 6 pans 30 des vis 23 grâce à quoi ces dernières sont bloquées en rotation.The jaws 22A and 22B are substantially symmetrical to each other with respect to the plane P of confrontation of the toothed edges of the jaws, at least in this respect, concerns their concave faces. In fact, these concave faces are the same. On the other hand, their outer faces are differentiated by the fact that one, 22A, of the jaws comprises two notches 27 at the bottom of which open holes 28 for the screws 23 and each bordered by two opposite flanks 29 and 29 ′ apart d equal to the width of the hexagon head 30 of the screws 23 thanks to which the latter are locked in rotation.

Ainsi qu'il ressort des figures 5 à 7, chaque mors (ici le mors 22A) comporte sur sa face concave, entre les extrémités 25 et 26, plus exactement entre les perçages 28 pour les vis et la seconde extrémité 26, un plateau épais 31, formant ici partie intégrante du mors, et dans laquelle sont ménagées des empreintes. En fait la seconde extrémité 26 est interrompue en son milieu en une zone 26A, en laquelle le plateau se prolonge donc sur toute l'épaisseur de cette seconde extrémité.As is apparent from FIGS. 5 to 7, each jaw (here the jaw 22A) has on its concave face, between the ends 25 and 26, more precisely between the holes 28 for the screws and the second end 26, a thick plate 31, here forming an integral part of the jaw, and in which are formed imprints. In fact the second end 26 is interrupted in the middle in a zone 26A, in which the plate therefore extends over the entire thickness of this second end.

Une première entaille 32 s'étend transversalement aux extrémités 25 et 26, depuis la zone centrale où est interrompue la seconde extrémité jusqu'entre les perçages 28. Ainsi que cela ressort clairement de la figure 5, cette première entaille présente un fond, comportant une portion centrale 32A gui est sensiblement parallèle à la surface plane du plateau 31 et une portion inclinée 32B s'étendant, ici avec un angle d'environ 30° par rapport à la surface plane du plateau, depuis cette portion centrale 32A et la zone centrale où est interrompue la seconde extrémité 26.A first notch 32 extends transversely at the ends 25 and 26, from the central zone where the second end is interrupted as far as between the bores 28. As is clear from FIG. 5, this first notch has a bottom, comprising a central portion 32A mistletoe is substantially parallel to the flat surface of the plate 31 and an inclined portion 32B extending, here with an angle of about 30 ° relative to the flat surface of the plate, from this central portion 32A and the central zone where the second end 26 is interrupted.

Une seconde entaille 33 est disposée à angle droit avec la première entaille 32, c'est-à-dire parallèlement aux première et seconde extrémités 25 et 26. Cette seconde entaille présente un fond comportant une portion centrale 33A coplanaire à la portion centrale 32A du fond de la première entaille 32 et deux surfaces inclinées 33B et 33C s'étendant, ici avec un angle d'environ 30° par rapport à la surface plane du plateau, depuis cette portion centrale jusqu'à proximité immédiate de la surface plane dudit plateau.A second notch 33 is arranged at right angles to the first notch 32, that is to say parallel to the first and second ends 25 and 26. This second notch has a bottom comprising a central portion 33A coplanar with the central portion 32A of the bottom of the first cut 32 and two inclined surfaces 33B and 33C extending, here at an angle of about 30 ° relative to the flat surface of the plate, from this central portion to immediate proximity to the flat surface of said plate .

Au moins une troisième entaille 34 (il y en ici deux) peut être disposée dans le prolongement de la seconde entaille, ayant un profil en portion de cercle (voir la figure 7).At least a third notch 34 (there are two here) can be arranged in the extension of the second notch, having a profile in a portion of a circle (see FIG. 7).

Les première et seconde entailles forment conjointement une sorte de croix.The first and second cuts jointly form a kind of cross.

Les flancs de ces entailles ont un écartement à peine supérieur (à un jeu près) à l'épaisseur e des maillons de la chaîne 2. Par ailleurs, ainsi que cela ressort de la figure 3, lorsque les deux mors sont attelés l'un à l'autre par les vis 23 et les écrous 24, les surfaces planes des plateaux ont un écartement à peine supérieur à l'épaisseur des maillons de la chaîne tandis que les portions centrales des entailles ont un écartement à peine supérieur à la largeur lo de ces maillons. Quant à la zone centrale où la seconde extrémité 26 est interrompue, elle a une largeur à peine supérieure à la largeur de ces maillons.The sides of these notches have a spacing barely greater (to within a clearance) than the thickness e of the links of the chain 2. Furthermore, as is apparent from FIG. 3, when the two jaws are coupled one to the other by the screws 23 and the nuts 24, the flat surfaces of the plates have a spacing barely greater than the thickness of the chain links while the central portions of the notches have a spacing barely greater than the width l o of these links. As for the central zone where the second end 26 is interrupted, it has a width barely greater than the width of these links.

Il ressort clairement de la figure 3 que lorsque l'on exerce un effort de traction sur la chaîne, il en résulte à l'interface entre le maillon terminal 2A et les portions inclinées 32B des premières entailles 32, un effet de coin forçant un écartement des extrémités 26 en regard et donc un rapprochement des premières extrémités 25. Lors d'un tel serrage, les flancs de la première entaille maintiennent ce dernier maillon en position tandis que les surfaces des plateaux 31 et les tranches en regard bordant les zones centrales 26A où sont interrompues les secondes extrémités assurent un maintien de l'avant-dernier maillon noté 2B. Tout échappement de ces maillons 2A et 2B hors de la pince est donc interdit.It is clear from FIG. 3 that when a tensile force is exerted on the chain, the result is at the interface between the end link 2A and the inclined portions 32B of the first notches 32, a wedge effect forcing a spacing opposite ends 26 and therefore a bringing together of the first ends 25. During such tightening, the sides of the first notch maintain this last link in position while the surfaces of the plates 31 and the facing edges bordering the central zones 26A where the second ends are interrupted ensure the penultimate link noted 2B is maintained. Any escape of these links 2A and 2B from the clamp is therefore prohibited.

On a vu à la figure 2 que la pince 21 permettait de diminuer très sensiblement le débattement minimal L′ nécessaire à la mise en place de la pince avec la chaîne et une poulie de déviation.It has been seen in FIG. 2 that the clamp 21 makes it possible to very significantly reduce the minimum clearance L ′ necessary for the positioning of the clamp with the chain and a deflection pulley.

La figure 9 représente un régime de traction sur la chaîne, avec une inclinaison du reste de la chaîne par rapport aux maillons 2A (non visible) et 2B.FIG. 9 represents a traction regime on the chain, with an inclination of the rest of the chain relative to the links 2A (not visible) and 2B.

La figure 10 présente encore un autre régime de traction appliqué à la chaîne, le maillon terminal (non visible) étant emprisonné dans les secondes empreintes en regard. Un effort de traction sur ce tronçon terminal parallèle aux extrémités 25 et 26 provoque ici aussi, par effet de coin avec les portions inclinées 33B ou 33C, le serrage des tranches 25A l'une vers l'autre. Le maillon (noté 2C) de la chaîne situé à l'opposé du maillon 2A par rapport au maillon 2B ne pénètre pas, dans l'exemple de cette figure 10, dans la pince auquel cas les troisièmes empreintes 34 peuvent être supprimées. Les troisièmes entailles 34 servent en effet à loger, si nécessaire, une partie d'un tel maillon 2C dans des pinces de plus grande dimension parallèlement aux extrémités 25 et 26. Une seule empreinte 34 peut suffire (de même que peuvent suffire des portions inclinées 33B ou 33C seulement) mais la présence des deux entailles 34 permet de disposer la chaîne dans un sens ou dans l'autre, dans le régime de traction de la figure 10.FIG. 10 shows yet another traction regime applied to the chain, the end link (not visible) being trapped in the second facing impressions. A tensile force on this end section parallel to the ends 25 and 26 here also causes, by wedge effect with the inclined portions 33B or 33C, the clamping of the sections 25A towards one another. The link (noted 2C) of the chain located opposite the link 2A relative to the link 2B does not penetrate, in the example of this figure 10, in the clamp in which case the third fingerprints 34 can be deleted. The third notches 34 serve in fact to accommodate, if necessary, part of such a link 2C in larger clamps parallel to the ends 25 and 26. A single cavity 34 may be sufficient (as may be inclined portions 33B or 33C only) but the presence of the two notches 34 makes it possible to arrange the chain in one direction or the other, in the traction regime of FIG. 10.

Le régime de la figure 10 permet d'exercer des efforts longitudinaux sur le rebord R de l'élément à redresser tandis que le régime de la figure 9 permet d'exercer des efforts en biais.The regime of Figure 10 allows to exert longitudinal forces on the rim R of the element to be straightened while the regime of Figure 9 allows to exert bias forces.

A titre d'exemple,

  • la pince est de dimensions 100 mm x 100 mm x 90 mm pour un poids de 4,5 Kg (cas d'une pince en acier),
  • les tranches dentées ont une longueur de 100 mm et une largeur de 14 mm,
  • la chaîne est d'un type propre à transmettre des efforts de 10 t (par exemple une longueur de 450 mm pour 10 maillons),
  • cette pince permet de réaliser des efforts transversaux de 9 t (figure 2 ou 9) et de 6 t (figure 10).
For exemple,
  • the clamp is of dimensions 100 mm x 100 mm x 90 mm for a weight of 4.5 Kg (in the case of a steel clamp),
  • the toothed edges have a length of 100 mm and a width of 14 mm,
  • the chain is of a type suitable for transmitting forces of 10 t (for example a length of 450 mm for 10 links),
  • this clamp makes it possible to carry out transverse forces of 9 t (figure 2 or 9) and 6 t (figure 10).

Il va de soi que la description qui précède n'a été proposée qu'à titre d'exemple non limitatif et que de nombreuses variantes peuvent être proposées par l'homme de l'art sans sortie du cadre de l'invention, telle que revendiquée.It goes without saying that the above description has been offered only by way of nonlimiting example and that numerous variants can be proposed by those skilled in the art without departing from the scope of the invention, such as claimed.

Claims (7)

  1. Traction assembly for straightening deformed bodywork components, including a traction clamp (21) and a chain (2) formed by links (2A, 2B ...) of known dimensions, this clamp having two C-shaped jaws (22A, 22B) coupled to each other on each side of a joining plane (P) by retaining bars (23, 24) so that the concavities of these jaws face each other, each jaw having a first end (25) with a face (25A) provided with clamping teeth, and a second end (26) inclined with respect to the joining plane (P), characterised in that the jaws (22A, 22B) having facing plates (31) disposed between the first and second ends (25, 26), separated by a distance substantially equal to the thickness (e) of a link (2B) in the chain (2), and in which there are formed first facing recesses (32, 33) having parallel back portions (32A, 33A) and inclined back portions (32B, 33B, 33C) converging towards each other as from the parallel back portions (32A, 33A), these recesses (32, 33) forming conjointly a housing for an end link (2A) in the chain, a traction force on the chain (2) producing a wedge effect between this end link (2A) and the inclined back portions (32B, 33B, 33C).
  2. Traction assembly according to Claim 1, characterised in that these recesses (32) are disposed transversely to the first and second ends (25, 26), the inclined back portions (32B) converging towards each other in areas (26A) where the second ends (26) are interrupted.
  3. Traction assembly according to Claim 1, characterised in that these recesses (33) are disposed parallel to the first and second ends (25, 26).
  4. Traction assembly according to Claim 3, characterised in that inclined back portions (33B, 33C) are provided in line with the back portions (33A) on each side of the latter.
  5. Traction assembly according to Claim 3 or Claim 4, characterised in that at least one third recess (34) is provided in line with but at a distance from each first recess in order to receive a part of a link (2C) parallel to this end link (2A) in the chain (2).
  6. Traction assembly according to any one of Claims 1 to 4, characterised in that there are formed, in the plates (31), two second facing recesses (33, 32) disposed transversely to the first recesses (32, 33), having second parallel back portions and second inclined back portions converging towards each other as from these second parallel back portions, the parallel back portions of the first and second recesses being coplanar, these second recesses (33, 32) forming conjointly a second housing for the end link (2A) in the chain (2).
  7. Traction assembly according to any one of Claims 1 to 6, characterised in that the plates (31) are situated between the retaining bars (23, 24) and the second ends (26).
EP19920402519 1991-10-11 1992-09-15 Self-locking tension clamp for straightening deformed car parts Expired - Lifetime EP0537038B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112553A FR2682310B1 (en) 1991-10-11 1991-10-11 SELF-TIGHTENING TENSIONER FOR STRAIGHTENING DEFORMED BODY ELEMENTS.
FR9112553 1991-10-11

Publications (2)

Publication Number Publication Date
EP0537038A1 EP0537038A1 (en) 1993-04-14
EP0537038B1 true EP0537038B1 (en) 1996-07-24

Family

ID=9417828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920402519 Expired - Lifetime EP0537038B1 (en) 1991-10-11 1992-09-15 Self-locking tension clamp for straightening deformed car parts

Country Status (3)

Country Link
EP (1) EP0537038B1 (en)
DE (2) DE69212423T2 (en)
FR (1) FR2682310B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT239998Y1 (en) * 1995-04-06 2001-03-16 Francesco Giovignani TENSIONER CLAMP FOR REPAIR OF CAR BODIES
US8992076B2 (en) 2010-12-15 2015-03-31 Waters Gmbh Dilatometer for measuring metallic samples

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355777A (en) * 1966-03-30 1967-12-05 Mojelski William Tension actuated clamp
JPS5149092B2 (en) * 1973-07-05 1976-12-24
FR2519574A1 (en) * 1982-01-08 1983-07-18 Celette Sa TRACTION CLAMP

Also Published As

Publication number Publication date
DE69212423D1 (en) 1996-08-29
FR2682310A1 (en) 1993-04-16
FR2682310B1 (en) 1994-01-14
DE537038T1 (en) 1993-10-14
DE69212423T2 (en) 1996-12-05
EP0537038A1 (en) 1993-04-14

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