FR2568846A3 - BICYCLE OR SIMILAR VEHICLE CRANKSET, PROVIDED FOR THE RETURN OF FRONT AND REAR DERAILLEUR CONTROL CABLES, EQUIPPED WITH AN AERODYNAMIC VACUUM DEVICE FOR CONDENSATION EXPANSION - Google Patents

Abstract

THE BOX INTENDED TO CONTAIN THE BICYCLE CRANKSET BEARING AND SIMILAR GEAR, INCLUDES A FRONT SPOILER 2 WHICH COVERS, UNDER ITS AERODYNAMIC PROFILE, A SERIES OF OPENINGS 3 PRACTICED IN THE BOX AND DIRECTED IN A DIRECTION OF THE VEHICLE FROM THE VEHICLE. .

Description

-1-

  The invention relates to a bicycles bottom bracket-

  clette or similar vehicles, intended for the return of cables

  front and rear derailleur control, equipped with a

  aerodynamic vacuum system for the expulsion of condensations.

  It has been known for a long time for bicycle pedal boots, in particular for competition, provided with holes

  for relieving and discharging condensations facing the re-

road clothing.

  These boxes, although satisfactory from the point of

  lightness and robustness, do not protect sufficiently

  lies the delicate pedal movement which is at the mercy of harmful projections of gravel of earth and raised mud

by the front wheel. -

  There has been a significant increase in u

  sour bottom bracket due to proportional increase

friction of the mechanism.

  On a competition bicycle, we largely tolerate

  wear of the parts, but we absolutely do not tolerate any increase

  friction that could in any way compromise

the performance of the bicycle.

  The aim of the present invention is to provide a bottom bracket capable of remedying the above drawbacks to thereby ensure the bottom bracket has optimal discharge of condensation without it penetrating inside the boot of harmful projections, which guarantees a limited coefficient and

  constant over time, and therefore reduced wear.

  Another object of the invention is to take advantage of these favorable conditions to provide, at the boot, cable passages able to be as much as possible protected against

harmful projections.

  These and other features will be evident

  for those skilled in the art, on reading the description and the res

dications which follow.

  The bottom bracket for a bicycle or similar vehicle

  laire provides protection or a "spoiler" located at the front, in -2-

  the direction of travel, sheltered from which a series of openings has been provided

  vertices arranged parallel to the axis of the box, and in succession

  transfer decreasing in relation to their dimensions; these open

  tures being limited laterally by cable guide grooves.

  The invention is illustrated, by way of example, without limitation, in the figures of the accompanying drawings o:

  Figure 1 is a perspective view.

Figure 2 is a sectional view.

  If reference is made to the figures cited above, the box which is the subject of the invention, intended to contain the bottom bracket of the bicycle, is indicated generally, by 1 is provided at the front, in the direction of travel, of a curved spoiler (2) extending over a large part of the box. This spoiler has an increasing distance from the geometric center

(B) of the bottom bracket (A).

  The width of the spoiler (2), closed on the sides by

  of the walls (2A), extends until covering, from an aero point of view

  dynamic, a series of openings (3) provided in the box and

  arranged parallel to the axis of the box, and in decreasing order

health of dimensions.

  These openings (3) are not radial, but are in-

  clinches in a direction opposite to the direction of movement in front of the vehicle, and are included laterally between a first groove (5) and a second groove (6). The first groove (5) is placed along that connecting it with a first through hole (7) made on the spoiler (2) and a boss in the form of a guide channel (8) placed and fixed on the lower part of

the box.

  The second groove (6) is placed along that connecting it with a second hole (9) made on the spoiler (2), with a hole (10) made on a reinforcement gusset (11) connecting two rear pipes (12 ) attached to the box and receiving

  each a tube (13) of the rear fork of the frame of the bicycles

clette.

  The axial dimensions of the openings (3) go di-

  minuting in the opposite direction to that of movement.

  -3- During the forward movement of the vehicle, which will be in the direction of arrow F, the fluid air streams, which, on a traditional bicycle, completely envelop the box,

  are then deflected by the spoiler (2) so as to generate a tur-

  bulence near the openings (3), which creates a vacuum in front of these openings, which causes possible condensation

  inside the box.

  The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts which have been more particularly indicated; she

  on the contrary embraces all variants.

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Claims (1)

  -1- Bottom bracket for a bicycle or similar vehicle, characterized in that a spoiler (2) is provided, placed at   the front, in the direction of travel, covering a series of openings   vertices (3) formed in the box (1) and arranged parallel-   lie at the axis of the box. -2- Box according to claim 1, characterized in that the openings (3) are of decreasing dimensions, in the direction   opposite to that of moving the vehicle.   -3- Box according to claim 1, characterized in that, on the box (1), on the sides of the openings (3), there are provided   grooves (5, 6) for guiding the cables.   -4- Box according to claim 1, characterized in that the spoiler (2) has two holes (7) and (9) placed-at a first groove (5) and a second groove (6) cable guide, the first groove being placed along that connecting the first through hole (7,) made on the spoiler (2) and a   pierced boss (8) placed at the bottom of the box, the   groove cone (6) being placed along that connecting a second hole (9) made on the spoiler (2) to a hole (10) made on the   reinforcement (11) connecting the two bases (12).   -5- Box according to claim 1, characterized in that the openings (3) are inclined in the opposite direction to that forward movement of the vehicle.