(19)
(11)EP 3 163 310 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
09.01.2019 Bulletin 2019/02

(21)Application number: 15819731.9

(22)Date of filing:  24.04.2015
(51)International Patent Classification (IPC): 
B62M 3/16(2006.01)
G01P 3/44(2006.01)
G01C 22/00(2006.01)
B62J 99/00(2009.01)
(86)International application number:
PCT/CN2015/077363
(87)International publication number:
WO 2016/004780 (14.01.2016 Gazette  2016/02)

(54)

BICYCLE PEDALING FREQUENCY SENSOR

FAHRRADTRITTFREQUENZSENSOR

CAPTEUR DE FRÉQUENCE DE PÉDALAGE DE BICYCLETTE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 11.07.2014 CN 201410338595

(43)Date of publication of application:
03.05.2017 Bulletin 2017/18

(73)Proprietor: Shenzhen Qianhai Livall Iot Technology Co., Ltd.
Shenzhen, Guangdong 518000 (CN)

(72)Inventor:
  • LIU, Kenneth
    Shenzhen, Guangdong Province 518000, (CN)

(74)Representative: Sun, Yiming 
HUASUN Patent- und Rechtsanwälte Friedrichstraße 33
80801 München
80801 München (DE)


(56)References cited: : 
WO-A1-2012/019654
WO-A1-2013/155112
CN-A- 104 077 795
US-A- 4 526 036
WO-A1-2012/052070
CN-A- 101 041 109
CN-Y- 2 339 990
US-A1- 2013 024 137
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Field of the Invention



    [0001] The present invention relates to a motion data acquisition sensor, and particularly relates to a sensor for acquiring treading frequency when a bicycle moves.

    Background of the Invention



    [0002] During motion like running and riding a bicycle, the motion performance is recorded and analyzed by acquiring important motion data such as treading frequency, so that an appropriate motion plan can be formulated.

    [0003] The existing sensor (also referred to as a treading frequency sensor) for acquiring bicycle treading frequency mainly acquires treading frequency data by adopting the induction principle in a way that a magnet is matched with a Hall element counter or an induction coil counter. The treading frequency sensor can acquire corresponding data by mutual motion coordination between two separated components, wherein at least one component needs to be fixed on a frame, the other component needs to be fixed on a crank linked with a middle axle, and the two components need to rotate synchronously. The existing bicycle does not provide a position for firmly fixing the treading frequency sensor, so corresponding components are generally fixed at corresponding positions of the bicycle via bandage, and the two components in matching induction shift after long-time motion to influence the stability.

    [0004] WO 2013/155112 A1 specifies a sensor device for measuring rotation of a crank in a bicycle. The device comprises an accelerometer, which is a quick-mount pedal sensor removably attached to a crank near a pedal.

    [0005] WO 2012/019654 A1 refers to a sensor device including a 2D acceleration sensor which is fixed to a wheel of a bicycle.

    [0006] WO 2012/052070 A1 relates to a sensor device dedicated for various applications in training practice, including bicycle sport as well as running and other activities. The sensor device can be fixed to a non-rotating part of a bicycle like a handlebar.

    [0007] US2013024137 A1 describes a torque sensor for a bicycle comprising a carrier fixed inside a hollow interior of the middle axle with strain gauges mounted at the carrier. The strain gauges are connected to a circuit and the circuit is connected to a battery via cables. The circuit and the battery are arranged inside the hollow middle axle, too.

    [0008] This document further describes the use of additional accelerometers or gyroscopes to determine angular velocity for calculation of the power.

    Summary of the Invention



    [0009] The technical problem mainly solved by the present invention is to provide a bicycle treading frequency sensor. The bicycle treading frequency sensor can accurately acquire the treading frequency in real time when a bicycle moves, and is compact in structure, stable and reliable. A bicycle adopting the treading frequency sensor is convenient to install and unlikely to loosen, and the acquired data is reliable.

    [0010] In order to solve the above technical problems, the present invention provides a bicycle treading frequency sensor, including a signal acquisition unit arranged on a circuit board and used for acquiring motion acceleration changes or/and angular velocity changes in different rotation directions of a middle axle in real time, a data transmission unit for transmitting the acquired data to a terminal, and a power supply for supplying power to the signal acquisition unit and the data transmission unit to work.

    [0011] Further, a data conversion unit for converting the change data of acceleration or/and angular velocity into a rotation number is also arranged on the circuit board, and the input end and the output end of the data conversion unit are connected with the signal acquisition unit and the data transmission unit respectively.

    [0012] Further, the signal acquisition unit includes a two-axis or three-axis acceleration sensor for acquiring motion acceleration.

    [0013] Further, the signal acquisition unit also includes a three-axis gyroscope sensor for acquiring angular velocity.

    [0014] Further, the data transmission unit includes a WIFI unit or a Bluetooth unit.

    [0015] Further, the treading frequency sensor further includes a shell with a hollow end and an expansion component in threaded fit with the shell, a circuit board integrating circuits and components and a battery are arranged in the hollow shell, and a cover enabling the circuit board and the battery to form an electrical circuit is arranged at the end of the shell.

    [0016] Further, the expansion component is provided with a trapezoidal through hole along the central axis thereof, threads matched with the shell are formed on the wall of the through hole, and at least one expansion port for communicating the interior with the exterior of the through hole is formed in the wall of the through hole.

    [0017] Further, 2-4 expansion ports are formed, and are uniformly distributed in the wall of the through hole.

    [0018] The bicycle treading frequency sensor of the present invention includes a signal acquisition unit arranged on a circuit board and used for acquiring motion acceleration changes or/and angular velocity changes in different rotation directions of a middle axle in real time, a data transmission unit for transmitting the acquired data to a terminal, and a power supply for supplying power to the signal acquisition unit and the data transmission unit to work. When in use, the treading frequency sensor is fixed on the hollow middle axle of a bicycle, and the middle axle, a crank and pedals of the bicycle rotate synchronously; during riding motion, acceleration change or/and angular velocity change data is acquired in real time and transmitted to the corresponding processing terminal via the data transmission unit for processing, real-time rotating frequency of the middle axle of the bicycle is obtained, then treading frequency data during riding can be determined, and treading frequency data is acquired when the bicycle moves. Because the treading frequency sensor skillfully implements counting through periodical changes of acceleration or/and angular velocity data and other data when the bicycle moves and does not need to carry out counting in a sensing mode through periodical relative motion between two separated components, the treading frequency sensor is simple in structure, small in size and works stably and reliably. After the middle axle with a hollow structure for reducing the weight is installed in the existing bicycle, no obvious components are exposed, and a loosening phenomenon does not appear. The treading frequency sensor can be applied to all bicycles with hollow middle axles, and thus has better generality.

    Brief Description of the Drawings



    [0019] To illustrate the technical solutions in the embodiments of the present invention or in the prior art more clearly, a brief introduction on the accompanying drawings which are needed in the description of the embodiments or the prior art is given below. Apparently, the accompanying drawings in the description below are merely some of the embodiments of the present invention, based on which other drawings can be obtained by the persons of ordinary skill in the art without any creative effort.

    Fig. 1 is a principle block diagram of an embodiment of a treading frequency sensor of the present invention.

    Fig. 2 is a principle block diagram of an embodiment of another treading frequency sensor of the present invention.

    Fig. 3 is a structural schematic diagram of an embodiment of a treading frequency device of the present invention.

    Fig. 4 is a sectional structural schematic diagram of the treading frequency device of the present invention in the axial direction.

    Fig. 5 is a schematic diagram of a matching fixed structure of the treading frequency sensor of the present invention and a bicycle.

    Fig. 6 is another schematic diagram of a matching fixed structure of the treading frequency sensor of the present invention and a bicycle.

    Fig. 7 is a structural enlarged schematic diagram of the matching position in Fig. 6.


    Detailed Description of the Embodiments



    [0020] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Apparently, the embodiments described below are a part, but not all, of the embodiments of the present invention. All of other embodiments, obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive efforts, fall into the protection scope of the present invention.

    [0021] As shown in Fig. 1, the present invention provides an embodiment of a bicycle treading frequency sensor.

    [0022] The bicycle treading frequency sensor includes: a signal acquisition unit 1 arranged on a circuit board and used for acquiring motion acceleration changes or/and angular velocity changes in different rotation directions of a middle axle in real time, a data transmission unit 3 for transmitting the acquired data to a terminal, and a power supply 4 for supplying power to the signal acquisition unit 1 and the data transmission unit 3 to work.

    [0023] Specifically, the circuit board provided with circuits is arranged in a shell, the signal acquisition unit 1 for acquiring acceleration changes or/and angular velocity changes in different motion directions is arranged on the circuit board, the data transmission unit 3 transmits the data of acceleration changes or/and angular velocity changes acquired by the signal acquisition unit 1 to the terminal for processing in real time, and the treading frequency during riding is output or recorded to facilitate acquisition and utilization.

    [0024] The data transmission unit 3 includes a wireless transmission unit or a wired transmission unit. Since the bicycle treading frequency sensor rotates along with the middle axle during riding, it had better adopt a WIFI unit, a Bluetooth unit or other short-distance wireless transmission unit to transmit data.

    [0025] When the signal acquisition unit 1 acquires acceleration data in different directions during bicycle motion, the signal acquisition unit 1 includes a two-axis or three-axis acceleration sensor, wherein when the two-axis sensor is installed, the rotating plane must be consistent with a plane formed by the two axes of the sensor, whereas the three-axis sensor is not limited thereto.

    [0026] When in use, the treading frequency sensor is fixed with the middle axle of the bicycle and rotates synchronously; when the middle axle rotates, the position of the treading frequency sensor is changed, and the gravitational acceleration value of the corresponding acceleration sensor in different directions of the rotating plane is also changed; when a user rides the bicycle, the middle axle rotates periodically; thus, the rotating frequency of the middle axle can be obtained via periodical changes of the gravitational acceleration acquired by the acceleration sensor in different directions of the rotating plane according to the time required for rotating one cycle, that is, acquisition of treading frequency data is realized.

    [0027] When the signal acquisition unit 1 acquires angular velocity change data in different directions when the bicycle moves, the signal acquisition unit 1 includes a three-axis gyroscope sensor. When in use, the treading frequency sensor rotates synchronously with the middle axle, the three-axis gyroscope sensor can output the angular velocity of the rotating treading frequency sensor during the rotation of the rotating treading frequency sensor, the rotating angle change data can be calculated according to the angular velocity, and when the middle axle rotates one cycle, the three-axis gyroscope sensor also synchronously rotates one cycle, that is, 360 degrees, the time required for rotating 360 degrees can be converted into treading frequency to realize acquisition of treading frequency data when the bicycle moves.

    [0028] When in use, the treading frequency sensor is fixed on the hollow middle axle of the bicycle, and the middle axle rotates synchronously with pedals; and when the bicycle moves, gravitational acceleration or/and angular velocity change data is detected and transmitted to the corresponding terminal via the data transmission unit for processing to obtain corresponding treading frequency data, and the treading frequency data is acquired when the bicycle moves. Because the treading frequency sensor skillfully implements counting through periodical changes of acceleration or/and angular velocity data and other data and does not need to carry out counting in a sensing mode through periodical relative motion between two separated components, the treading frequency sensor is simple in structure, dustproof, waterproof and works stably and reliably. Since the middle axle of the existing bicycle is provided with a hollow structure in order to reduce the weight during installation, no obvious components are exposed, and a loosening phenomenon does not appear. Meanwhile, the treading frequency sensor can be applied to all bicycles with hollow middle axles, and thus has better generality.

    [0029] In this embodiment, the power supply 4 is a button cell. Since the treading frequency sensor carrying the power supply periodically rotates during working, on the one hand, it is inconvenient to supply power via an external power supply; and on the other hand, a power output line does not need to be reserved, so the treading frequency sensor is convenient to install.

    [0030] As shown in Fig. 2, the present invention further puts forward another embodiment based on the above embodiment.

    [0031] The treading frequency sensor further includes a data conversion unit 2 arranged between the signal acquisition unit 1 and the data transmission unit 3, the data conversion unit 2 converts the signals acquired by the signal acquisition unit 1 into data corresponding to the bicycle treading frequency and outputs the data, the data is transmitted to the corresponding processing terminal such as a smart phone with processing software or the like via the data transmission unit 3, bicycle treading frequency data can be obtained via necessary processing, and other units and the data processing mode are not changed. In this embodiment, real-time bicycle treading frequency can be directly obtained by the mobile terminal equipped with necessary processing software, and the mobile terminal should not be a special device or a dedicated computer application program.

    [0032] As shown in Fig. 3 and Fig. 4, the treading frequency sensor further includes a shell 2' with a hollow end and an expansion component 1' in threaded fit with the shell 2', a circuit board 4' integrating circuits and components and a battery 5' are arranged in the hollow shell 2', and a cover 3' enabling the circuit board 4' and the battery 5' to form an electrical circuit is arranged at the end of the shell 2'. Specifically, circuits and components of the treading frequency sensor are integrated on the circuit board 4', the circuit board 4' and the battery 5' are arranged in the shell 2' with the hollow end, the cover 3' enabling the circuit board 4' and the battery 5' to form an electrical circuit is arranged at the end of the shell 2', and the shell 2' is in threaded fit with the expansion component 1'.

    [0033] The expansion component 1' is provided with a trapezoidal through hole 10' along the central axis thereof, threads 12' matched with the shell 2' are formed on the wall of the through hole, and at least one expansion port 11' for communicating the interior with the exterior of the through hole 10' is formed in the wall of the through hole. That is, the expansion component 1' is provided with a trapezoidal internal thread structure along the central axis thereof, and the internal threads are matched with external threads 22' on the shell 2. The expansion component 1' is provided with at least one expansion port 11'; when the number of the expansion ports 11' is two or more, the expansion ports 11' are uniformly distributed in the wall of the through hole; and 2-5 expansion ports 11' are appropriate according to the cost and the production process.

    [0034] As shown in Fig. 5, when in use, the expansion component 1' in the treading frequency sensor D is placed in the hollow middle axle B of a bicycle, the shell 2' is rotated to move towards the interior of the expansion component 1', the shell 2' is extruded outwards by the expansion component 1' in the inward moving process because the axial section of the shell 2' is of a trapezoidal structure having a big end and a small end, the outer wall of the expansion component 1' is extruded and fastened with the middle axle under the coordination of the expansion ports 11', and then the treading frequency sensor is well fixed without loosening; and the shell 2' is nearly concealed in the middle axle after fixing, so the treading frequency sensor can be conveniently fixed without reconstruction of the structure of the bicycle.

    [0035] As shown in Fig. 6 and Fig. 7, because the treading frequency sensor D obtains treading data during riding via a two-axis or three-axis acceleration sensor or a three-axis gyroscope sensor for acquiring angular velocity without interaction between two separated components, it can have a thickness of 5-10MM and a diameter within 3CM. When the middle axle to be installed of the bicycle is of a solid structure, that is, when the bicycle is a common bicycle, the treading frequency sensor D is fixed on a bicycle crank C via a bandage E. The treading frequency can be determined by detecting the rotating frequency of the crank during working. The treading frequency sensor with small size does not influence the use of the bicycle.

    [0036] The above embodiments are merely used for illustrating the technical solutions of the present invention, rather than limiting the present invention; though the present invention is illustrated in detail with reference to the aforementioned embodiments, it should be understood by those of ordinary skill in the art that modifications may still be made on the technical solutions recorded in the aforementioned respective embodiments, or equivalent alterations may be made to a part of technical features thereof; and these modifications or alterations do not make the essence of the corresponding technical schemes depart from the spirit and scope of the technical schemes of the respective embodiments of the present invention.


    Claims

    1. A bicycle treading frequency sensor (D) configured to be fixed to a middle axle (B) of a bicycle (A), comprising:

    a signal acquisition unit (1) arranged on a circuit board (4') and used for acquiring motion acceleration changes or/and angular velocity changes in different rotation directions of the middle axle (B) in real time, a data transmission unit (3) for transmitting the acquired data to a terminal, and a battery (5') for supplying power to the signal acquisition unit (1) and the data transmission unit (3) to work, wherein

    the bicycle treading frequency sensor (D) is configured to be fixed in a hollow structure of the middle axle (B);

    the signal acquisition unit (1) comprises a two-axis or three-axis acceleration sensor for acquiring motion acceleration; and

    the treading frequency sensor further comprises a shell (2') with a hollow end and an expansion component (1') in threaded fit with the shell (2') and configured to be placed in the hollow structure of the middle axle (B), the circuit board (4') integrating circuits and components and the battery (5') arranged in the shell (2'), and a cover (3') enabling the circuit board (4') and the battery (5') to form an electrical circuit arranged at the end of the shell (2').


     
    2. The bicycle treading frequency sensor (D) of claim 1, wherein,
    a data conversion unit (2) for converting the change data of acceleration or/and angular velocity into a rotation number is also arranged on the circuit board (4'), and the input end and the output end of the data conversion unit (2) are connected with the signal acquisition unit (1) and the data transmission unit (2) respectively.
     
    3. The bicycle treading frequency sensor (D) of claim 1, wherein,
    the signal acquisition unit (1) also comprises a three-axis gyroscope sensor for acquiring angular velocity.
     
    4. The bicycle treading frequency sensor (D) of claim 1 or 2, wherein,
    the data transmission unit (3) comprises a WIFI unit or a Bluetooth unit.
     
    5. The bicycle treading frequency sensor (D) of claim 1, wherein,
    the expansion component (1') is provided with a trapezoidal through hole (10') along the central axis thereof, threads (12') matched with the shell (2') are formed on the wall of the through hole (10'), and at least one expansion port (11') for communicating the interior with the exterior of the through hole (10') is formed in the wall of the through hole (10').
     
    6. The bicycle treading frequency sensor (D) of claim 5, wherein,
    2 to 4 expansion ports (11') are formed, and are uniformly distributed in the wall of the through hole (10').
     


    Ansprüche

    1. Fahrradtrittfrequenz-Sensor (D), der dafür ausgelegt ist, an einer Mittelachse (B) eines Fahrrades (A) befestigt zu werden, umfassend:

    eine Signalerfassungseinheit (1), die auf einer Schaltplatine (4') angeordnet ist und zum Erfassen von Bewegungsbeschleunigungsänderungen und/oder Winkelgeschwindigkeitsänderungen in verschiedenen Drehrichtungen der Mittelachse (B) in Echtzeit verwendet wird, eine Datenübertragungseinheit (3) zum Übertragen der erfassten Daten an ein Terminal und eine Batterie (5') zum Zuführen von Energie an die Signalerfassungseinheit (1) und die Datenübertragungseinheit (3) für den Betrieb, wobei

    der Fahrradtrittfrequenz-Sensor (D) dafür ausgelegt ist, in einer hohlen Struktur der Mittelachse (B) befestigt zu werden;

    die Signalerfassungseinheit (1) einen zweiachsigen oder dreiachsigen Beschleunigungssensor zur Erfassung von Bewegungsbeschleunigung umfasst; und

    der Trittfrequenzsensor ferner einen Mantel (2') mit einem hohlen Ende und einer Expansionskomponente (1') in Schraubpassung mit dem Mantel (2') umfasst und dafür ausgelegt ist, in der Hohlstruktur in der Mittelachse (B) platziert zu werden; wobei die Schaltplatine (4') Schaltungen und Komponenten und eine Batterie (5') integriert, die im Mantel (2') angeordnet sind, und eine Abdeckung (3'), die der Schaltplatine (4') und der Batterie (5') ermöglicht, eine elektrische Schaltung zu bilden, die am Ende des Mantels (2') angeordnet ist.


     
    2. Fahrradtrittfrequenz-Sensor (D) nach Anspruch 1, wobei
    eine Datenkonvertierungseinheit (2) zum Konvertieren der Änderungsdaten von Beschleunigung und/oder Winkelgeschwindigkeit in eine Drehzahl ebenfalls auf der Schaltplatine (4') angeordnet ist, und das Eingabeende und das Ausgabeende der Datenkonvertierungseinheit (2) sind mit der Signalerfassungseinheit (1) bzw. der Datenübertragungseinheit (3) verbunden.
     
    3. Fahrradtrittfrequenz-Sensor (D) nach Anspruch 1, wobei
    die Signalerfassungseinheit (1) auch einen dreiachsigen Gyroskop-Sensor zum Erfassen der Winkelgeschwindigkeit umfasst.
     
    4. Fahrradtrittfrequenz-Sensor (D) nach Anspruch 1 oder 2, wobei
    die Datenübertragungseinheit (3) eine WIFI-Einheit oder eine Bluetooth-Einheit umfasst.
     
    5. Fahrradtrittfrequenz-Sensor (D) nach Anspruch 1, wobei
    die Expansionskomponente (1') mit einem trapezförmigen Durchgangsloch (10') entlang der Mittelachse derselben versehen ist, wobei Gewindegänge (12'), die abgestimmt auf den Mantel (2') sind, auf der Wand des Durchgangslochs (10') gebildet sind, und der mindestens eine Expansionsport (11') zur Verbindung des Inneren mit dem Äußeren des Durchgangslochs (10') ist in der Wand des Durchgangslochs (10') gebildet.
     
    6. Fahrradtrittfrequenz-Sensor (D) nach Anspruch 5, wobei
    2 bis 4 Expansionsports (11') in der Wand des Durchgangslochs (10') gebildet und gleichförmig verteilt sind.
     


    Revendications

    1. Capteur de fréquence de pédalage sur vélo (D), configuré pour être fixé sur un axe central (B) d'un vélo (A), comprenant :

    une unité d'acquisition de signal (1) disposé sur une carte de circuit (4') et utilisée pour l'acquisition de changements d'accélération de mouvement et/ou de changements de vitesse angulaire dans différentes directions de rotation de l'axe central (B) en temps réel, une unité de transmission de données (3) pour la transmission des données acquises à un terminal, et une batterie (5') pour l'alimentation en puissance de l'unité d'acquisition de signal (1) et de l'unité de transmission de données (3), dans lequel

    le capteur de fréquence de pédalage sur vélo (D) est configuré pour être fixé dans une structure creuse de l'axe central (B) ;

    l'unité d'acquisition de signal (1) comprend un capteur d'accélération à deux axes ou à trois axes pour l'acquisition de l'accélération du mouvement ; et

    le capteur de fréquence de pédalage comprend en outre une coque (2') avec une extrémité creuse et un composant d'expansion (1') ajusté par filetage par rapport à la coque (2') et configuré pour être placé dans la structure creuse de l'axe central (B), la carte de circuit (4') intégrant des composants et la batterie (5') étant disposée dans la coque (2'), et un couvercle (3') permettant à la carte de circuit (4') et à la batterie (5') de former un circuit électrique à l'extrémité de la coque (2').


     
    2. Capteur de fréquence de pédalage sur vélo (D) selon la revendication 1, dans lequel
    une unité de conversion de données (2) pour la conversion de données de changement d'accélération et/ou de vitesse angulaire en un nombre de rotations est également disposée sur la carte de circuit (4'), et l'extrémité d'entrée et l'extrémité de sortie de l'unité de conversion de données (2) sont raccordées à l'unité d'acquisition de signal (1) et à l'unité de transmission de données (3) respectivement.
     
    3. Capteur de fréquence de pédalage sur vélo (D) selon la revendication 1, dans lequel
    l'unité d'acquisition de signal (1) comprend également un capteur de gyroscope à trois axes pour l'acquisition de la vitesse angulaire.
     
    4. Capteur de fréquence de pédalage sur vélo (D) selon la revendication 1 ou 2, dans lequel
    l'unité de transmission de données (3) comprend une unité WIFI ou une unité Bluetooth.
     
    5. Capteur de fréquence de pédalage sur vélo (D) selon la revendication 1, dans lequel
    le composant d'expansion (1') est pourvu d'un trou de passage trapézoïdal (10') le long de l'axe central de celui-ci, des filetages (12') adaptés à la coque (2') sont formés sur la paroi du trou de passage (10'), et au moins un orifice d'expansion (11') faisant communiquer l'intérieur avec l'extérieur du trou de passage (10') est formé dans la paroi du trou de passage (10').
     
    6. Capteur de fréquence de pédalage sur vélo (D) selon la revendication 5, dans lequel
    2 à 4 orifices d'expansion (11') sont formés, et sont répartis uniformément dans la paroi du trou de passage (10').
     




    Drawing

















    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description