FR2562181A1 - Safety screw - Google Patents
Safety screw Download PDFInfo
- Publication number
- FR2562181A1 FR2562181A1 FR8405169A FR8405169A FR2562181A1 FR 2562181 A1 FR2562181 A1 FR 2562181A1 FR 8405169 A FR8405169 A FR 8405169A FR 8405169 A FR8405169 A FR 8405169A FR 2562181 A1 FR2562181 A1 FR 2562181A1
- Authority
- FR
- France
- Prior art keywords
- screwdriver
- blade
- screw
- flank
- allowing
- 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- Withdrawn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
- 238000005056 compaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002023 wood Substances 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
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0076—Specially shaped nuts or heads of bolts or screws for rotations by a tool causing slipping of the tool in loosening rotation, i.e. disabling unscrewing unless another tool is used
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
Description
"Vis de sécurité"
La présente invention concerne une vis de sécurité destinée à être vissée à l'aide d'un tournevis habituel, droit ou cruciforme, dans le sens de serrage seulement."Security screw"
The present invention relates to a safety screw intended to be screwed using a usual screwdriver, straight or Phillips, in the tightening direction only.
Pour éviter le démontage de dispositifs placés dans les lieux publics ou accessibles au public comme par exemple les accessoires de véhicules de transport en commun, il est connu d'utiliser des moyens de fixation particuliers tels que des vis nécessitant un tournevis de forme particulière, par exemple dont la lame comporte une encoche ou deux branches de façon à interdire le dévissage de telles vis par exemple avec un tournevis habituel, un tournevis de canif ou même une lame de canif. To avoid dismantling of devices placed in public places or accessible to the public such as for example the accessories of public transport vehicles, it is known to use particular fixing means such as screws requiring a screwdriver of particular shape, for example example whose blade has a notch or two branches so as to prevent the unscrewing of such screws for example with a usual screwdriver, a penknife screwdriver or even a penknife blade.
Le même problème se pose pour certains acces- soires automobiles tels que des ailerons, des rétroviseurs, etc... Dans certains cas, on évite la difficulté en fixant les accessoires par l'intérieur de la carrosserie. The same problem arises for certain automobile accessories such as ailerons, mirrors, etc. In certain cases, the difficulty is avoided by fixing the accessories from inside the body.
Toutefois, une telle solution n'est pas toujours possible et il existe des cas pour lesquels il est nécessaire de visser de l'extérieur.However, such a solution is not always possible and there are cases for which it is necessary to screw from the outside.
I1 est également possible de fixer des accessoires avec des rivets. Toutefois, lorsque les rivets se desserrent sous l'effet des vibrations ou du tassement de la matière ou autre, il n'est possible de les recomprimer que si les rivets sont accessibles des deux côtés, ce qui n'est souvent pas le cas. It is also possible to fix accessories with rivets. However, when the rivets loosen under the effect of vibrations or compaction of the material or the like, it is only possible to recompress them if the rivets are accessible from both sides, which is often not the case.
La présente invention a pour but de créer une vis destinée à être utilisée avec un tournevis habituel, à lame plate ou cruciforme, mais qui puisse être serrée sans pouvoir se desserrer à l'aide d'un tournevis. The object of the present invention is to create a screw intended to be used with a usual screwdriver, with a flat or cruciform blade, but which can be tightened without being able to be loosened using a screwdriver.
A cet effet, l'invention concerne une vis caractérisée en ce que la tête comporte des logements pour recevoir la lame du tournevis, ces logements étant formés du côte de l'attaque de la lame par un flanc d'attaque permettant l'appui de la partie correspondante de la lame du tournevis dans le sens du serrage alors que l'autre flanc du logement est constitué par une surface ne permettant pas de prise à la lame du tournevis dans le sens opposé. To this end, the invention relates to a screw characterized in that the head comprises housings for receiving the blade of the screwdriver, these housings being formed on the side of the blade attack by an attack flank allowing the support of the corresponding part of the blade of the screwdriver in the tightening direction while the other side of the housing is constituted by a surface which does not allow the blade of the screwdriver blade to be taken in the opposite direction.
La mise en place et le serrage d'une telle vis ne présente aucune difficulté et ces opérations peuvent se faire à l'aide d'un tournevis habituel. The installation and tightening of such a screw presents no difficulty and these operations can be done using a usual screwdriver.
Il en est de méme du resserrage si, par suite de vibrations ou de tassement des pièces assemblées, un tel resserrage est nécessaire. The same applies to tightening if, as a result of vibrations or compaction of the assembled parts, such tightening is necessary.
Par contre, en aucun cas, on ne peut dévisser une telle vis. On the other hand, in no case can such a screw be unscrewed.
La présente invention s'applique à toutes les vis quel que soit le sens de la vis. La fabrication d'une telle vis est particulièrement simple, ce qui n'en augmente pas le court. The present invention applies to all screws regardless of the direction of the screw. The manufacture of such a screw is particularly simple, which does not increase the short.
Suivant une autre caractéristique, les flancs ont un profil en dents de scie. According to another characteristic, the sides have a sawtooth profile.
Suivant une autre caractéristique, le flanc incliné a une forme de rampe helicoldale. According to another characteristic, the inclined flank has the shape of a helical ramp.
La présente invention sera décrite plus en détail à l'aide des dessins annexés, dans lesquels :
- La figure 1 est une vue schématique de dessus d'une tête de vis pour un tournevis à lame plate selon l'invention,
- La figure 2 est une vue en coupe schématique circulaire, développée, de la tête de vis selon la figure 1.The present invention will be described in more detail with the aid of the appended drawings, in which:
FIG. 1 is a schematic top view of a screw head for a flat blade screwdriver according to the invention,
- Figure 2 is a schematic circular sectional view, developed, of the screw head according to Figure 1.
Selon la figure 1, la tête de vis 1 comporte un logement diamétral composé de deux moitiés 2a, 2b, symétriques par rapport à l'axe 0 de la vis. Les parties 2a et 2b étant égales, la description se limitera à la seule partie 2a. Ce logement est délimité dans le sens de la flèche A correspondant au serrage de la vis, par un flanc raide 3 (3a, 3b) qui sert d'appui à la partie correspondante (4a, 4b) du tournevis 4 (représenté en coupe),et d'un flanc 5 (5a, 5b), incliné, qui ne permet pas l'accrochage de la lame de tournevis 4 (4a, 4b) lorsque le tournevis est tourné dans le sens opposé à celui de la flèche A. According to Figure 1, the screw head 1 comprises a diametrical housing composed of two halves 2a, 2b, symmetrical with respect to the axis 0 of the screw. Parts 2a and 2b being equal, the description will be limited to only part 2a. This housing is delimited in the direction of arrow A corresponding to the tightening of the screw, by a steep side 3 (3a, 3b) which serves as a support for the corresponding part (4a, 4b) of the screwdriver 4 (shown in section) , and a side 5 (5a, 5b), inclined, which does not allow the attachment of the screwdriver blade 4 (4a, 4b) when the screwdriver is turned in the opposite direction to that of arrow A.
Le flanc 5a se poursuit jusqu'au flanc 3a et ainsi de suite. The side 5a continues until the side 3a and so on.
La figure 2 montre de façon explicite la forme des logements 2a, 2b ainsi que la forme des flancs 3a, 5a, 3b, 5b. Lorsque le tournevis est poussé dans le sens de la flèche A, il s'appuie contre les flancs 3a, 3b alors que s'il est tourné dans le sens contraire de la flèche A, il remonte le long des flancs Sa, Sb. FIG. 2 shows explicitly the shape of the housings 2a, 2b as well as the shape of the sides 3a, 5a, 3b, 5b. When the screwdriver is pushed in the direction of arrow A, it bears against the sides 3a, 3b whereas if it is turned in the opposite direction of arrow A, it goes up along the sides Sa, Sb.
Le meme principe que celui développé ci-dessus s'applique également à des logements pour des tournevis cruci formes. The same principle as that developed above also applies to housings for cruciform screwdrivers.
La présente invention s'applique à la réalisation de vis à bois, à plastique ou à tôle, notamment pour la fixation inviolable d'accessoires ou autres sur des véhicules automobiles, etc... The present invention applies to the production of wood, plastic or sheet metal screws, in particular for the tamper-proof fixing of accessories or the like to motor vehicles, etc.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8405169A FR2562181A1 (en) | 1984-04-02 | 1984-04-02 | Safety screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8405169A FR2562181A1 (en) | 1984-04-02 | 1984-04-02 | Safety screw |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2562181A1 true FR2562181A1 (en) | 1985-10-04 |
Family
ID=9302733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8405169A Withdrawn FR2562181A1 (en) | 1984-04-02 | 1984-04-02 | Safety screw |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2562181A1 (en) |
-
1984
- 1984-04-02 FR FR8405169A patent/FR2562181A1/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |