FR2529273A3 - Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque - Google Patents

Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque Download PDF

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Publication number
FR2529273A3
FR2529273A3 FR8211445A FR8211445A FR2529273A3 FR 2529273 A3 FR2529273 A3 FR 2529273A3 FR 8211445 A FR8211445 A FR 8211445A FR 8211445 A FR8211445 A FR 8211445A FR 2529273 A3 FR2529273 A3 FR 2529273A3
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FR
France
Prior art keywords
head
bolt
sheared
tightening torque
shear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR8211445A
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French (fr)
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR8211445A priority Critical patent/FR2529273A3/en
Publication of FR2529273A3 publication Critical patent/FR2529273A3/en
Withdrawn legal-status Critical Current

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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
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/005—Measures against unauthorised operation of bolts, nuts or pins
    • 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

Abstract

The two items to be fixed together are drilled to take the bolt (1) with a nut (4). The security bolt is used to give a vandal-proof fixing and has a specially machined head. The head may be slotted (2), hexagonal or socketed and has a slot (3) machined in it. The slot has a conical root with the smaller diameter adjacent to that face of the head in contact with the work piece (7). Under excessive tightening torque the top of the head is sheared off leaving a plain, flat section.

Description

"VIS A TETE AUTOCASSANTE "
I1 existe de multiples procédés pour fixer une pièce accessoi- re sur un appareil.Généralement elle est simplement boulonnée."SELF-BREAKING HEAD SCREW"
There are multiple methods for attaching an accessory part to a device. Generally it is simply bolted.

Dans de nombreux cas,on desirerait que cet accessoire puisse être condamné pour en éviter le vol.Ainsi de nombreux accessoires ext4- rieurs à l'appareil,particulièrement ceux des engins mobiles,tels que motocyclettes,motos ou autos,devraient être inviolables.In many cases, it would be desirable that this accessory could be condemned to prevent theft. Thus many accessories external to the device, particularly those of mobile devices, such as motorcycles, motorcycles or cars, should be inviolable.

I1 n'existe pas de système économique assurant ce bloquage.Une fixation inviolable de très faible prix serait appréciée et utile. There is no economic system ensuring this blocking. A tamper-proof fixing at a very low price would be appreciated and useful.

L'objet de la pr ésente invention consiste en une vis,ou un boulon,permettant de bloquer définitivement un accessoire sur un appareil,ou un appareil sur un bâti,une base ou un socle.Cette vis ou ce boulon,est économique carellene nécessite aucun dispositif complémentaire.@Ile est formée d'une tête spéciale qui constitue son originalité: celle-ci,facile à usiner,offre la propriété d'être autocassante.A la fin du serrage,cette tête peut être cassée et détachée de son corps car elle présente un point de faiblesse. facili
tant sa rupture en l'endroit désiré.Ce point draffaiblissement est obtenu par une gorge creusée dans cette tête pour en diminuer
sa section réststante.Cette gorge,plus ou moins profonde. suivant les cas,située vers la base de cette tate,permet un vissage normal mais n'autorise pas un vissage anormalement fort.Dans ee cas,il y a rupture du haut de la tete,condamnation de la vis et de la pièce.The object of the present invention consists of a screw, or a bolt, making it possible to definitively block an accessory on a device, or a device on a frame, a base or a base. This screw or this bolt is economical because it requires no additional device. @ Ile is formed by a special head which constitutes its originality: this, easy to machine, offers the property of being self-breaking. At the end of the tightening, this head can be broken and detached from its body because it has a point of weakness. facili
as long as it breaks in the desired location. This weakening point is obtained by a groove cut in this head to reduce it
its resistant section. This throat, more or less deep. depending on the case, located towards the base of this tate, allows normal screwing but does not allow abnormally strong screwing. In this case, there is a break at the top of the head, locking of the screw and the part.

La sus-dite gorge sera usinée,de préférence avec un outil à angle vif,particulièrement du côté de la face restante.Le diamètre le plus faible restera du caté de cette face,ce qui permettra de ne laisser qu'une cassure avec un minimum de bavure.De plus cette gor
ge sera conique d'environ 50 à I00.The above-mentioned groove will be machined, preferably with a sharp-angle tool, particularly on the side of the remaining face. The smallest diameter will remain on the side of this face, which will leave only a break with a minimum more this gor
ge will be conical from about 50 to 100.

I1 est évident que cet effet n'est garanti qu'autant que le boulon correspondant ne puisse être dévissé ou que la queue de vis soit inaccessible. It is obvious that this effect is only guaranteed as long as the corresponding bolt cannot be unscrewed or the tail of the screw is inaccessible.

Cette invention concerne toutes les vis,ou boulons,à têtes de révolution telles que celles cylindriques à fente,en croix,rondes ou fraisées,ou à six pans creux dites BTR, à t8tes prismatiques (hexagonales ou carrées) et à têtes speciales pouvant accepter une gorge.La nature et les dimensions de ces vis,ou boulons,varie- ront suivant les cas.Cetteinvention 'applique aussi aux écrous. This invention relates to all screws, or bolts, with revolution heads such as cylindrical slotted, cross, round or countersunk, or with hexagon socket called BTR, with prismatic heads (hexagonal or square) and with special heads which can accept The nature and dimensions of these screws, or bolts, will vary depending on the case. This invention also applies to nuts.

Ci-joint donné à titre indicatif et non limitatif des exemples de réalisation: -en Fig I-le boulon est formé d'une vis(I)àfiletage standard,à tête cylindrique(2)fend.Cette tête(2)comporte une gorge(3)près de la base,pénétrant jusqu'au trois quart de sa profondeur.L'écrou(4)de ce boulon est de forme rectangulaire pour que son grand côté(5) puisse s'appuyer sur l'épaulement(6) de la pièce à assembler au socle (7).Après rupture de la tete(2),il roste sa base pour maintenir les pièces (6) et (7). Enclosed given as an indication and not limiting of the exemplary embodiments: -in Fig I-the bolt is formed by a screw (I) with standard thread, with cylindrical head (2) split. This head (2) has a groove (3) near the base, penetrating up to three quarters of its depth. The nut (4) of this bolt is rectangular in shape so that its long side (5) can rest on the shoulder (6) from the part to be assembled to the base (7). After breaking the head (2), it scrapes its base to hold the parts (6) and (7).

Dans la figure 2-la vis(9)-dite STR-a une tête cylindrique cre- use(IO)à empreinte hexagonale.Vers sa base,cette tête(IO)est saignée d'une gorge(II) pénétrant jusqu'au troissquart de la profondeur.La tige filetée(9) pénètre dans les deux pièces(12)et(13) à assembler.Dans ce cas,les trous de la pièce(13)sont taraudés et borgnes. In Figure 2-the screw (9) - called STR - has a hollow cylindrical head (IO) with a hexagonal impression. Towards its base, this head (IO) is tapped with a groove (II) penetrating up to Three-quarter of the depth. The threaded rod (9) enters the two parts (12) and (13) to be assembled. In this case, the holes in the part (13) are tapped and blind.

Dans le cas de la Figure 3,la vis(14) a une tête hexagonale(15) classique munie d'une gorge(16).Elle assemble deux pièces(I7)et (I8) à l'aide de boulons (19) (19)(19")...placés dans des logements
creux.Après rupture de la tête(15),le boulon(19)ne peut âtre dévissé par manque d'espace au passage des outils. In the case of Figure 3, the screw (14) has a conventional hexagonal head (15) provided with a groove (16). It assembles two parts (I7) and (I8) using bolts (19) (19) (19 ") ... placed in housings
After breakage of the head (15), the bolt (19) cannot be unscrewed for lack of space for the passage of the tools.

Claims (4)

REVENDICATIONS I-vi d'assemblage inviolable,à tête autocassante et à tige filetée standard.La tête cylindrique fendue est munie d'une profonde gorge près de sa base où s'effectue la rupture.Le fond de cette gorge est en biais de prèférence. Valable pour les boulons ou écrous 2-dispositii comme précédent différencié par la forme hexagonale du haut de la tête.CLAIMS I-vi of tamper-evident assembly, with self-breaking head and standard threaded rod. The slotted cylindrical head is provided with a deep groove near its base where the rupture takes place. The bottom of this groove is preferably biased . Valid for bolts or nuts 2-dispositii as precedent differentiated by the hexagonal shape from the top of the head. 3-dispositif comme les précédents se différentiant par un écrou3-device like the previous ones differentiated by a nut rectangulairé se bloquant contre la pièce à assembler. rectangular blocking against the part to be assembled. 4-dispositif comme ceux de I à 3, se différençiant par des têtes4-device like those of I to 3, differentiating by heads creuses à empreintes hexagonale. hexagonal cavities. 5-dispositif comme ceux de I à 3, se différençiant par des têtes5-device like those of I to 3, differentiating by heads rondes et fendues round and split 6-dispositifs à tates carrées sauf au dessous de la gorge.  6-square tata devices except below the throat.
FR8211445A 1982-06-28 1982-06-28 Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque Withdrawn FR2529273A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8211445A FR2529273A3 (en) 1982-06-28 1982-06-28 Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8211445A FR2529273A3 (en) 1982-06-28 1982-06-28 Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque

Publications (1)

Publication Number Publication Date
FR2529273A3 true FR2529273A3 (en) 1983-12-30

Family

ID=9275539

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8211445A Withdrawn FR2529273A3 (en) 1982-06-28 1982-06-28 Shear-head security bolt - has conical groove machined in bolt head which is sheared off under excessive tightening torque

Country Status (1)

Country Link
FR (1) FR2529273A3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2653095A1 (en) * 1989-10-17 1991-04-19 Radiall Sa Tamper-evident obturating device for a connector element, particularly a coaxial connector
WO1993018943A1 (en) * 1992-03-14 1993-09-30 Malcolm Kerry Fuel cut-off anti-theft device
EP2813650A1 (en) * 2013-06-13 2014-12-17 QR International AB Locking device for a gate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2653095A1 (en) * 1989-10-17 1991-04-19 Radiall Sa Tamper-evident obturating device for a connector element, particularly a coaxial connector
WO1993018943A1 (en) * 1992-03-14 1993-09-30 Malcolm Kerry Fuel cut-off anti-theft device
EP2813650A1 (en) * 2013-06-13 2014-12-17 QR International AB Locking device for a gate

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