FR2514717A3 - BICYCLE EQUIPMENT WITH MULTIPLICATION RAYS AND AERODYNAMIC PEDAL LEVER CRANKS - Google Patents

Abstract

THE EQUIPMENT ACCORDING TO THE INVENTION INVOLVES A CROWN 1 PRESENTING SPOKES 2 WHICH CONVERT TO A HUB AND A PEDAL CRANK 4 SOLID WITH THE HUB. EACH RADIUS 2 OF CROWN 1 SHOWS A PARALLELOGRAM SECTION OF WHICH TWO SIDES 20, 20 ARE PARALLEL TO THE ROTATION PLAN, AND TWO OTHER SIDES 21, 21 ARE OBLICALLY ORIENTED IN RELATION TO THIS PLAN. THESE DIMENSIONS 21, 21 ARE APPROXIMATELY PARALLEL WITH THEM AND ARE LOCATED ONE TOWARDS THE DIRECTION OF ROTATION AND THE OTHER IN THE OPPOSITE DIRECTION. THE INVENTION ALLOWS MAXIMUM SUITABILITY OF THESE COMPONENTS IN THE AIR.

Description

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  Equipment for bicycles with multiplication rays

  and pedal cranks with aerodynamic sections.

  The invention relates to equipment for bicycles comprising a multiplication or crown with several spokes and two pedal cranks, one of which is fixed to the rays of the multiplication or crown or body

with these.

  According to known embodiments, the equipment

  for bicycles do not offer the aerodynamic characteristics

  which would be desirable in order to obtain the maximum efficiency of the cyclist's effort. Moreover, the known equipment generally has the disadvantage of presenting, in the place

  from the junction zone of the crank to the multiplica-

  or crown, a hub or portion of cylindrical or similar shape that protrudes substantially outwardly

  relative to the plane containing the rays.

  On the contrary, the object of the invention is to provide equipment for conforming bicycles such as the rays of the multiplication as well as each

  crank handle have polygonal sections that allow

  put the maximum aptitude for the penetration of these

posing in the air.

  Another object of the invention is to propose an equi-

  for bicycles in which the junction area of the spokes of the multiplication or crown with the corresponding crank has a continuous spherical or continuous convex surface to eliminate any significant protrusion or obstacle and to make the group

more aerodynamic.

  Another object of the invention is to propose an equi-

  for bicycles in which the crank handle

  when it is fixed at the multiplication or

  well, has an embedded end in the

  convergence of the rays of multiplication or crown.

  Embodiments of the invention will be disclosed.

  hereinafter given by way of non-limiting example with reference to the accompanying drawings, in which: FIGS. 1 and 2 show two perspectives

  respectively from the front and the rear of the equi-

  Figure 3 is a side view; FIG. 4 is a cross-section of the scale and FIG. 5 is a cross-section of one

  rays of multiplication or crown.

  The equipment under consideration includes a multiplication

  or crown 1 having several radii 2 which converge

  towards a central part or hub 3 of which

  hand pedal crank 4 Multiplication or

  1 may be single or double and may be attached to the spokes 2 as shown in the drawing or

form a set with these.

  Similarly, the crank 4 can be fixed to the central portion or hub 3 as shown.

  or to make body with the rays.

  When the crank 4 is mounted and fixed, its ex-

  4 'tremity connected to the multiplication or crown 1 is

  recessed in the central part or hub 3 o conver-

  In any case, the front surface of this central portion or hub 3 has a continuous spherical shape or in any case convex as shown in FIG.

particularly Figures 1 and 3.

  Still according to the invention, each spoke 2 of the

  multiplication or crown has a section in

  a program similar to that shown in Figure 1, having essentially two opposite sides 20, 20 substantially parallel to the plane o is carried out the rotation of the group and two other opposite sides 21, 21 intersecting the plane at an appropriate angle and in any case different

from the right angle.

  For its part, the crank 4 has an irregular polygonal cross-section, see FIG. 4 with two sides, 40 approximately parallel to the plane of rotation of the crank, and two other opposite sides 4, 41 which are located one towards the other. direction of rotation and the other of the opposite side and which both intersect

  at an appropriate angle, but different from the right angle.

  The general conformation of the spherical surface hub

  Seric or convex and the particular sections of

  2 spokes and the crank handle enable great

  study to the penetration into the air, which can not be

  otherwise, which favors a greater return

  the effort exerted by the cyclist.

25147 1 7

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Claims (5)

  1. Equipment for bicycles comprising a   Tiplication or crown (1) having a plurality of spokes (2) converging towards a central portion or hub (3) and a pedal crank (4) attached to or integral with the central portion or hub, characterized thereby that each radius (2) of the multiplication or ring has a parallelogram section with two opposite first ends (20, 20) approximately parallel to the rotation plane of the multiplication and two second c8 tees (21, 21) oriented in such a manner that to cut this plane from a different angle of the right angle, these second c 8 tees (21, 21) being approximately parallel to each other and being one towards the direction of rotation and the other side opposite.   2. Equipment for bicycles comprising a   tiplication or crown (1) having a plurality of spokes (2) converging towards a central portion or hub (3)   and a pedal crank (4) attached to this central portion   tread or hub or which is integral therewith, characterized by   the fact that the crank (4) has a poly-   an irregular groove having two opposing first ends (40, 40) approximately parallel to the plane of rotation of the crank and two second ends (41, 41) oriented to intersect the plane at an angle other than   right angle, these second c8 tees being approximately parallel   between them and being one towards the direction of rota-   and the other from the opposite side.   3. Equipment according to one of claims 1 and   2, characterized in that the central portion or hub has a continuous spherical or convex frontal surface including that of the end of the crank,   fixed to this part or attached to it.   4. Equipment for bicycles, characterized by a multiplication or single or double crown (1) having a plurality of spokes (2) each having a parallelogram section defined by two opposite sides (20, 20) 251 47 1 7   -5- approximately parallel to the plane of rotation and two other opposite sides (21, 21) intersecting this plane at an angle   different from the right angle, and by a crank of   dale (4) having a polygonal section with two sides (o 40, 41) approximately parallel to the plane of rotation and two other opposite sides (41, 41) intersecting this plane of rotation at an angle different from the right angle, the spokes and the crank being connected to the place of a   continuous spherical or convex frontal surface.