FR2491564A1 - Automatic torque limited Allen screw - has added piece to limit Allen key insertion and leave portion for removal when correct tightening torque has been achieved - Google Patents
Automatic torque limited Allen screw - has added piece to limit Allen key insertion and leave portion for removal when correct tightening torque has been achieved Download PDFInfo
- Publication number
- FR2491564A1 FR2491564A1 FR8021192A FR8021192A FR2491564A1 FR 2491564 A1 FR2491564 A1 FR 2491564A1 FR 8021192 A FR8021192 A FR 8021192A FR 8021192 A FR8021192 A FR 8021192A FR 2491564 A1 FR2491564 A1 FR 2491564A1
- Authority
- FR
- France
- Prior art keywords
- screw
- torque
- head
- allen
- tightening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000037431 insertion Effects 0.000 title abstract 2
- 238000003780 insertion Methods 0.000 title abstract 2
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 230000035515 penetration Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
- F16B23/0038—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially prismatic with up to six edges, e.g. triangular, square, pentagonal, Allen-type cross-sections
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
Description
La présente invention est relative à une vis limiteur de couple automatique, pouvant Strie utilisée, par exemple, pour assurer le serrage des conducteurs sur un connecteur électrique. The present invention relates to an automatic torque limiting screw, capable of streaking used, for example, to tighten the conductors on an electrical connector.
On connais des vis limiteurs de couple à tête hexagonale. Ces vis sont pourvues d'une gorge usinée avec précision dans la tête, ce qui permet la rupture d'une partie de cette dernière à la valeur du couple choisie. Ces systèmes connus présentent l'inconvénient, lorsqu'ils sont utilisés pour le serrage dans les connecteurs électriques, d'être volumineux (6 pans exté- rieurs), et ainsi d'augmenter l'encombrement de l'enveloppe isolante appelée "gousset" (nécessité de passer la clé de serrage : clé à douille isolée). Hexagonal head torque limiting screws are known. These screws are provided with a precision machined groove in the head, which allows part of the latter to break at the value of the selected torque. These known systems have the disadvantage, when used for tightening in electrical connectors, of being bulky (6 external sides), and thus of increasing the size of the insulating envelope called "gusset" (need to pass the tightening key: insulated socket wrench).
La vis sans tête à 6 pans creux présente l'avantage d'assurer des couples de serrage aussi importants, tout en réduisant les volumes, mais la limitation du couple de serrage par la rupture de la tette de la vis pose notamment les problèmes suivants a - il est nécessaire de limiter la pénétration de la clé de serrage1 pour
réaliser la rupture de la tête; b - il faut qu'après la rupture de la tete, il reste dégagé quelques milli
mètres de hauteur des pans de la vis, afin d'en permettre le desserrage.The hexagon socket headless screw has the advantage of ensuring such high tightening torques, while reducing the volumes, but limiting the tightening torque by breaking the head of the screw poses the following problems in particular: - it is necessary to limit the penetration of the tightening key 1 to
achieve head rupture; b - after breaking the head, a few milli remains
meters of the sides of the screw, to allow it to be loosened.
L'invention apporte une solution à ce problème. Elle vise, à cet effet, une vis à limiteur de couple automatique à pans creux, du type muni d'une gorge usinée avec précision, permettant la rupture d'une partie de la tette lors du serrage selon un couple choisi, caractérisée en ce qu'elle comporte un pion en matériau dur, monté à force dans la partie perdable de la vis et libre dans la partie restante, ce pion limitant ainsi la pénétration de la clé lors du serrage, et, au moment de la rupture, restant assemblé sur la partie rompue, dégageant ainsi la hauteur des pans nécessaire à un éventuel desserrage. The invention provides a solution to this problem. It aims, for this purpose, an automatic torque limiting screw with hollow sides, of the type provided with a precision machined groove, allowing the breaking of a part of the tette during tightening according to a chosen torque, characterized in that that it comprises a hard material pin, force-fitted in the loosable part of the screw and free in the remaining part, this pin thus limiting the penetration of the key during tightening, and, at the time of breaking, remaining assembled on the broken part, thus freeing up the height of the sides necessary for any loosening.
Selon l'invention, ledit pion est réalisé en une matière plastique dure. According to the invention, said pin is made of a hard plastic material.
D'autres caractéristiques et avantages de cette invention ressortiront de la description faite ci-après, en référence au dessin annexé, qui en illustre un exemple de réalisation, dépourvu de tout caractère limitatif. Sur le dessin
- la Figure 1 représente, en élévation et en coupe avec arrachement partiel, une vis à 6 pans creux, à limitation de couple
- la Figure 2 est une vue partielle, analogue à la Figure 1, illustrant une vis selon l'invention preste à l'utilisation
- la Figure 3 représente la vis selon la Figure 2 lors de son serrage par une clé
- la Figure 4 représente la vis après rupture de la tête et enlèvement de la partie perdable ; et,
- la Figure 5 représente un connecteur de dérivation pré-isolé, notamment pour lignes électriques sous tension, dans lequel est mise en oeuvre la vis selon l'invention.Other characteristics and advantages of this invention will emerge from the description given below, with reference to the appended drawing, which illustrates an exemplary embodiment thereof, devoid of any limiting character. On the drawing
- Figure 1 shows, in elevation and in section with partial cutaway, a hexagon socket screw, torque limitation
- Figure 2 is a partial view, similar to Figure 1, illustrating a screw according to the invention ready for use
- Figure 3 shows the screw according to Figure 2 when tightened by a wrench
- Figure 4 shows the screw after rupture of the head and removal of the lost part; and,
- Figure 5 shows a pre-insulated branch connector, in particular for live power lines, in which the screw according to the invention is used.
La Figure 1 représente une vis 10 à six pans creux, comportant une partie perdable 12. A cet effet, la vis a été munie d'une gorge 14 usinée avec précision, définissant une zone de rupture au couple choisi. Figure 1 shows a screw 10 with a hexagon socket, having a loose part 12. For this purpose, the screw has been provided with a groove 14 machined with precision, defining a rupture zone at the chosen torque.
Pour limiter la pénétration de la clé de serrage pour la rupture et conserver dégagée la partie 16 des pans de la vis, après rupture et séparation de la partie 12, I'invention prévoit de loger un pion 20 en matériau dur, notamment en matière plastique dure, dans l'alésage de la vis. Ce pion 20 est réalisé de façon à se monter à force dans la partie perdable 12 de la vis, tout en restant libre dans la partie restante 10'. Ainsi qu'on le voit sur les Figures 3 et 4, le pion 20 limite la pénétration de la clé 18, lors du serrage de la vis, et, après rupture selon la gorge 14, sous un couple préétabli, ce pion reste en place sur la partie rompue 12, dégageant ainsi une hauteur des pans 16 suffisante pour effectuer ultérieurement un desserrage éventuel. To limit the penetration of the tightening wrench for breaking and keep part 16 of the sides of the screw free, after rupture and separation of part 12, the invention provides for housing a pin 20 made of hard material, in particular plastic hard, in the bore of the screw. This pin 20 is produced so as to be force-fitted into the loosable part 12 of the screw, while remaining free in the remaining part 10 ′. As seen in Figures 3 and 4, the pin 20 limits the penetration of the key 18, when tightening the screw, and, after breaking along the groove 14, under a preset torque, this pin remains in place on the broken part 12, thereby releasing a height of the sides 16 sufficient to subsequently perform any loosening.
Cette vis limiteur de couple trouve une application particulièrement intéressante dans les connecteurs de dérivation pré-isolés pour lignes électriques sous tension, et notamment dans un connecteur du type décrit dans la demande de brevet français n 78 25 456, déposée le 5 septembre 1978 par la demanderesse. This torque limiting screw finds a particularly advantageous application in pre-insulated branch connectors for live electrical lines, and in particular in a connector of the type described in French patent application No. 78 25 456, filed on September 5, 1978 by the plaintiff.
Dans un connecteur de ce type (Fig. 5), le constructeur doit définir la valeur du couple idéal à exercer sur la vis, ce couple permettant d'obtenir le meilleur contact pour les lames 22, sans pour autant endommager les brins du câble 24. Les monteurs ne disposant pas de clés dynamométriques, il se produit des problèmes résultant de connecteurs trop ou pas assez serrés. La mise en oeuvre d'une vis limiteur de couple selon l'invention, sur de tels connecteurs, permet de réaliser un serrage avec limitation automatique du couple, et, en outre, rend possible une dépose éventuelle. In a connector of this type (Fig. 5), the manufacturer must define the value of the ideal torque to be exerted on the screw, this torque making it possible to obtain the best contact for the blades 22, without damaging the strands of the cable 24 As assemblers do not have torque wrenches, problems arise from connectors that are too tight or not tight enough. The use of a torque limiting screw according to the invention, on such connectors, makes it possible to perform a tightening with automatic torque limitation, and, moreover, makes possible possible removal.
I1 demeure bien entendu que cette invention n'est pas limitée à l'exemple de réalisation ni à l'application mentionnés ci-dessus, mais qu'elle en englobe toutes les variantes. I1 remains of course that this invention is not limited to the embodiment or the application mentioned above, but that it encompasses all variants.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8021192A FR2491564A1 (en) | 1980-10-03 | 1980-10-03 | Automatic torque limited Allen screw - has added piece to limit Allen key insertion and leave portion for removal when correct tightening torque has been achieved |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8021192A FR2491564A1 (en) | 1980-10-03 | 1980-10-03 | Automatic torque limited Allen screw - has added piece to limit Allen key insertion and leave portion for removal when correct tightening torque has been achieved |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2491564A1 true FR2491564A1 (en) | 1982-04-09 |
Family
ID=9246521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8021192A Withdrawn FR2491564A1 (en) | 1980-10-03 | 1980-10-03 | Automatic torque limited Allen screw - has added piece to limit Allen key insertion and leave portion for removal when correct tightening torque has been achieved |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2491564A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19960198A1 (en) * | 1999-12-14 | 2001-06-28 | Pfisterer Kontaktsyst Gmbh | Locking screw device with distancing element and screw connecting lock for fixing an object includes a setscrew with a tool holder, predetermined breaking points and a distancing element in the tool holder. |
US11193522B2 (en) | 2016-11-30 | 2021-12-07 | 3M Innovative Properties Company | Shear bolt |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2435829A1 (en) * | 1978-09-05 | 1980-04-04 | Verlant Et Beaurain | Preassembled monoblock connector for live electrical line - has previously assembled connector which perforates insulation providing anchor for additional wire |
-
1980
- 1980-10-03 FR FR8021192A patent/FR2491564A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2435829A1 (en) * | 1978-09-05 | 1980-04-04 | Verlant Et Beaurain | Preassembled monoblock connector for live electrical line - has previously assembled connector which perforates insulation providing anchor for additional wire |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19960198A1 (en) * | 1999-12-14 | 2001-06-28 | Pfisterer Kontaktsyst Gmbh | Locking screw device with distancing element and screw connecting lock for fixing an object includes a setscrew with a tool holder, predetermined breaking points and a distancing element in the tool holder. |
US11193522B2 (en) | 2016-11-30 | 2021-12-07 | 3M Innovative Properties Company | Shear bolt |
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ST | Notification of lapse |