BE400470A

BE400470A -

Info

Publication number: BE400470A
Authority: BE

Description

       

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  "Fixation à vis contre le vol d'objets fixés aux véhicules, notamment de dynamos d'éclairage et lanternes de bicyclettes" 
L'invention est relative à une fixation à vis contre le vol d'objets fixés aux véhicules, notamment de dynamos d'éclairage, de lanternes et autres accessoires de bicyclettes ou de motocyclettes. On connait déjà différents dispositifs de sûreté pour vis, par exemple des goupilles s'engageant dans la tige de la vis ou des têtes à l'extrémité de la, vis, qui visent à empêcher de dévisser la vis complètement et de désas- sembler les éléments qu'elle assemble.

   Toutefois ces têtes ou goupilles sont peu efficaces contre le vol, car on arrive à les cisailler facilement en dévissant brutalement la vis à laquelle A 

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 ils sont adaptés, L'invention a pour but de procurer une fixation par vis qui écarte cet inconvénient. Suivant   l'inven-   tion, la vis comporte un prolongement qui peut tourner libre- ment dans le trou taraudé prévu pour la vis et qui est muni d'un arrêt, tel que par exemple une goupille, une tête etc. 



   Le dessin annexé représente plusieurs exemples d'exécution de l'invention. 



   Fig. 1 est une coupe d'une fixation à vis pour la dynamo d'éclairage d'une bicyclette. 



   Fig. 2 est une coupe d'une deuxième forne   d'exécu-   tion. 



   Fig. 3 est une coupe suivant la ligne 3-3 de la Fig. 2. 



   Fig. 4, 5 et 6 montrent différentes formes d'exécu- tion de la vis. 



   Sur la Fig. l, a désigne une dynamo d'éclairage pour bicyclettes et b est une douille dans laquelle est articulée la dynamo. est le porte-dynamo qui est assemblé d'une fa- çon quelconque, par exemple au moyen de vis, à la douille d'articulation. Le porte-dynamo et l'étrier de fixation d constituent un collier que   l'on   peut serrer sur la fourche f au moyen de vis e vissées dans l'étrier. Les vis comportent au-delà de leur partie filetée un prolongement g dont le diamètre est plus petit que celui du trou taraudé dans l'étrier. 



  L'extrémité du col g est pourvue d'une tête de rivet h qu'on y forme après avoir vissé la vis dans l'étrier d, de sorte que l'étrier est assemblé de façon inamovible au porte-dynamo c par les vis e. 



   Le col g est prévu pour que, après avoir dévissé les   vis e   de l'étrier d, on puisse les faire tourner dans le trou 

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 taraudé de l'étrier sans qu'elles se dévissent davantage. De cette façon on évite le cisaillement de la tête h à l'extré- mité du   col g.   



   Les Fig. 2 et 3 montrent une deuxième forme d'exécu- tion. Dans la tôle de l'étrier sont repoussées des renfonce- ments i dans lesquels le   col g   et la tête h des vis sont logés de manière qu'on ne puisse les atteindre avec un outil. 



  Le porte-dynamo c présente aussi des renfoncements k qui correspondent aux renfoncements i de l'étrier d, comme le montre la Fig. 2.



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  "Screw fixing against theft of objects attached to vehicles, in particular lighting dynamos and bicycle lanterns"
The invention relates to a screw fixing against the theft of objects attached to vehicles, in particular lighting dynamos, lanterns and other accessories for bicycles or motorcycles. Various safety devices for screws are already known, for example pins engaging in the shank of the screw or heads at the end of the screw, which aim to prevent the screw from unscrewing completely and disassembling the screws. elements that she assembles.

   However, these heads or pins are not very effective against theft, because we can easily shear them by suddenly unscrewing the screw to which A

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 they are suitable. The object of the invention is to provide a fixing by screw which eliminates this drawback. According to the invention, the screw has an extension which can rotate freely in the tapped hole provided for the screw and which is provided with a stop, such as for example a pin, a head etc.



   The appended drawing represents several exemplary embodiments of the invention.



   Fig. 1 is a cross section of a screw fixing for the lighting dynamo of a bicycle.



   Fig. 2 is a section of a second execution form.



   Fig. 3 is a section taken along line 3-3 of FIG. 2.



   Fig. 4, 5 and 6 show different embodiments of the screw.



   In Fig. l, a designates a lighting dynamo for bicycles and b is a socket in which the dynamo is articulated. is the dynamo holder which is assembled in any way, for example by means of screws, to the articulation sleeve. The dynamo holder and the fixing bracket d constitute a clamp which can be tightened on the fork f by means of screws e screwed into the caliper. The screws include beyond their threaded part an extension g whose diameter is smaller than that of the tapped hole in the caliper.



  The end of the neck g is provided with a rivet head h which is formed there after having screwed the screw into the caliper d, so that the caliper is fixedly assembled to the dynamo holder c by the screws e.



   The neck g is designed so that, after unscrewing the screws e of the bracket d, they can be rotated in the hole

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 tapped from the caliper without unscrewing them further. In this way, the shearing of the head h at the end of the neck g is avoided.



   Figs. 2 and 3 show a second embodiment. Recesses i are pushed back into the plate of the caliper, in which the neck g and the head h of the screws are housed so that they cannot be reached with a tool.



  The dynamo holder c also has recesses k which correspond to the recesses i of the caliper d, as shown in FIG. 2.

Claims

Figs. 4 to 6 show screws provided with various safety stops against theft. The screw of FIG. 4 has a pin m preferably made of hardened steel. On the screw of FIG. 5 is riveted, at the end of the neck g, a steel washer n with a raised edge o which prevents the rivet head from being filed or pulled out. Fig. 6 shows a screw whose neck has an axial bore in which a rivet p is driven, R E V E N D I C A T I O N S --------------------------- 1.- Screw fixing against the theft of objects attached to vehicles, in particular lighting dynamos and bicycle lanterns., Characterized in that the screws have an extension which can rotate freely in the tapped hole provided for the screws , and which is provided with a stop such as for example a pin, a head etc.

2.- Screw fixing according to claim l, with a fixing collar, characterized in that the part of the collar in which the screw is screwed has a recess in which the neck of the screw is housed. <Desc / Clms Page number 4>

3.- Fixing 'screw according to claim 1, with fixing collar, characterized in that the dynamo holder or lantern holder, and the bracket have recesses' in which are housed, respectively, the part of the screw between the dynamo holder and the caliper, and the neck of the screw.

4.- screw fixing according to claim 1, 2 or 3, characterized in that a washer, preferably made of hardened steel ,, whose edge is raised so as to surround the rivet head, is riveted to the end of the screw extension.

5.- Screw fixing according to claim 1, 2 or 3, characterized in ee that a pin preferably made of hardened steel is fixed in the extension of the screw.

6. - Screw fastening according to claim 1, 2 or 3, characterized in that a rivet is driven into the extension of the screw.

7.- Screw fixing against theft of objects attached to vehicles, in substance as described above with reference to the attached drawing.