BE489511A

BE489511A -

Info

Publication number: BE489511A
Authority: BE

Description

       

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  Manivelle en deux éléments rapportés pour bicyclettes, tandems ou similaires* 
Pour réduire le prix de revient des manivelles connues à ce jour, il est apparu nécessaire de concevoir une mani- velle en deux éléments   rapportés   faisant l'objet du présent brevet. 



   Pour bien fixer l'objet de l'invention, sans toutefois le limiter, dans le dessin   annexé:   
La figure I montre en élévation, une manivelle réali- sée selon l'invention (le bras étant représenté coupé). 



   La figure 2 montre une vue de profil et en coupe par- tielle, correspondante à la figure 1 (le trait mixte montre l'adjonction d'un épaulement prévu sur la section correspon- dante de la tête). 

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   Les figures   3 - 4 - 5   montrent les différentes opérations de forgeage (ou de matricage) pour l'obtention d'une manivelle réalisée selon la variante. 



   Cette manivelle établie selon l'invention comporte essen- tiellement : 
La tête indépendante a pourra être forgée ou prise dans du fer profilé qui sera ensuite débité juste   à   l'épaisseur. Sa partie supérieure a1 forme une section franche ou épaulée (trait mixte de la figure 2) et suivant la section intérieure creuse du bras rapporté b pour servir alors de centrage indé-   pendamment   de la fixation par surfaces jointives et soudées. 



   Le bras rapporté b sera constitué soit par : I - un élément tubulaire cylindrique ou conique à section mé- plate, ronde, elliptique ou à pans dont l'extrémité sera apla- tie en b1 pour former l'oeil de la manivelle. Ce dernier étant ensuite percé et fileté transversalement pour recevoir l'axe de la pédale, 2 - L'extrémité aplatiq formant oeil, pourra également être établie (selon figures 3 - 4 - 5 ) dans le cas d'un bras creux c, mais avec un trou   borgnecCe   bras étant matrice au forgé    pour former successivement une sphère c1 et un oeil plein c2   qui sera ensuite percé et fileté transversalement. 



   Il reste entendu que la liaison des éléments (bras et tête) sera assurée par soudure électrique, par brasage ou par tout autre mode connu. 



   D'autre part, les dispositions ci-dessus s'appliquent éga- lement aux manivelles dites à plateaux, aux manivelles à bras rapportés ou autres. 



   Comme il va de soi et comme il ressort déjà de ce qui pré- cède, l'invention ne se limite aucunement à celui de ses modes 

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 d'application non plus qu'à ceux des modes de réalisation de ses diverses parties ayant plus spécialement été indiqués; elle en embrase au contraire toutes les variantes.



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  Crank in two inserts for bicycles, tandems or similar *
In order to reduce the cost price of cranks known to date, it has appeared necessary to design a crank in two added elements which is the subject of the present patent.



   In order to properly fix the subject of the invention, without however limiting it, in the appended drawing:
FIG. I shows in elevation a crank produced according to the invention (the arm being shown cut off).



   FIG. 2 shows a side view and in partial section, corresponding to FIG. 1 (the phantom line shows the addition of a shoulder provided on the corresponding section of the head).

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   FIGS. 3 - 4 - 5 show the various forging (or stamping) operations for obtaining a crank produced according to the variant.



   This crank established according to the invention essentially comprises:
The independent head a can be forged or taken from profiled iron which will then be cut to the thickness. Its upper part a1 forms a straight or shouldered section (phantom line in FIG. 2) and following the hollow internal section of the attached arm b to then serve as a centering independent of the fixing by contiguous and welded surfaces.



   The attached arm b will be formed either by: I - a cylindrical or conical tubular element with a flat, round, elliptical or sloped section, the end of which will be flattened at b1 to form the eye of the crank. The latter being then drilled and threaded transversely to receive the axis of the pedal, 2 - The flattened end forming an eye, can also be established (according to figures 3 - 4 - 5) in the case of a hollow arm c, but with a blind hole This arm being a forged die to successively form a sphere c1 and a solid eye c2 which will then be drilled and threaded transversely.



   It remains understood that the connection of the elements (arm and head) will be ensured by electric welding, by brazing or by any other known method.



   On the other hand, the above provisions also apply to the so-called plate cranks, to the cranks with attached arms or the like.



   As it goes without saying and as it already emerges from what precedes, the invention is in no way limited to that of its modes

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 of application neither to those of the embodiments of its various parts which have been more especially indicated; on the contrary, it ignites all the variants.

Claims

ABSTRACT The present invention relates to: A crank in two added elements for bicycles, tandems or the like, and which is essentially characterized by: I - Its two elements, the head and the arm, which are assembled by welding, brazing or other methods.

2 - Its head can be forged, or taken in a profiled iron, said head is also provided with a straight section or a shouldered section to allow centering of the attached arm.

3 - Its added arm, taken either in a cylindrical or conical tubular element and with a cross section, flat, round, elliptical or with sides, the end of which will be flattened to form the eye.

4 - Its attached arm / taken from an element of any cross-section, but with an internal blind hole, the solid end of Isolation being forged or stamped to obtain the eye.

5 - The combination of elements according to I -2 -3 -4 -.

6 - As new industrial products, cranks in two added elements, comprising the above characteristics taken together or separately * By proxy of Etablissements Pierre LYOTARD (Société Anonyme)