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WO2018146703A1 - Mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable - Google Patents

Mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable Download PDF

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Publication number
WO2018146703A1
WO2018146703A1 PCT/IT2017/000026 IT2017000026W WO2018146703A1 WO 2018146703 A1 WO2018146703 A1 WO 2018146703A1 IT 2017000026 W IT2017000026 W IT 2017000026W WO 2018146703 A1 WO2018146703 A1 WO 2018146703A1
Authority
WO
WIPO (PCT)
Prior art keywords
thrust
rotation
lever
pin
thrust lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT2017/000026
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English (en)
Inventor
Enrico VOLTAZZA
Fabio VOLTAZZA
Michela VOLTAZZA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRESSOFUSIONE SACCENSE Srl
Original Assignee
PRESSOFUSIONE SACCENSE Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PRESSOFUSIONE SACCENSE Srl filed Critical PRESSOFUSIONE SACCENSE Srl
Priority to PCT/IT2017/000026 priority Critical patent/WO2018146703A1/fr
Publication of WO2018146703A1 publication Critical patent/WO2018146703A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B62M3/02—Construction of cranks operated by hand or foot of adjustable length
    • B62M3/04—Construction of cranks operated by hand or foot of adjustable length automatically adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot

Definitions

  • the present invention relates to a mechanism for generating a rotation movement with double thrust lever having variable arm.
  • this mechanism may find application in the movement mechanism of a bicycle.
  • the mechanism according to the invention may also find other applications involving generating a rotation movement through two pedal cranks or hand cranks, for instance in nautical craft such as pedal boats or in double crank winches .
  • a known mechanism for generating a rotation movement with double thrust lever comprises two rods, each of which forms a thrust lever. Each rod is secured at a first end portion to a rotation pin around which the rotation movement develops and bears associated to a second end portion, opposite the first, a thrust appendage which is destined to receive an external force suitable to determine the rotation movement of the rod and of the associated rotation pin.
  • the two thrust rods are keyed to the two opposite ends of the same hub or rotation pin, to extend in length (orthogonally to the axis of rotation) in diametrically opposite positions relative to one another.
  • the motion generated by the rotation of the rods and of the rotation pin is transmitted by transmission means kinematically connected to the rotation pin or to one of the rods, for example by means of a toothed wheel/ chain assembly.
  • the complete rotation motion of each rod is divided into two phases (each extending to about a half- revolution) : a thrust phase, in which the rod and the relative thrust appendage are active in generating the movement, and a recovery phase, in which the rod and the relative thrust appendage are passively dragged in rotation by the movement of the other rod (which is in the thrust phase) until brought back to the thrust phase once again .
  • the rotation speed is a function of the thrust impressed to the rod and the length (or arm) of said rod, understood as the distance between the rotation pin and the thrust appendage.
  • the rotation speed can be varied only by varying the thrust impressed on the rod. It is in fact not possible to vary the arm, that is, the length of the rod, this being made in one single piece. This embodiment is dictated by requirements of mechanical robustness and simplicity of construction. The realization of a variable arm mechanism would in fact be too complex both from a construction point of view, and from a point of view of operational management understood as the adaptation of the length of the arm to operational needs.
  • a typical application of the generation mechanism described above is in the bicycle.
  • the mechanism comprises two pedal cranks (rods) , each of which bears at its end a pedal (thrust appendage) .
  • the two pedal cranks are keyed to the two opposite ends of a hub, to extend in length in diametrically opposite positions relative to one another.
  • a toothed wheel is associated to one of the two cranks, on which wheel the driving belt to the rear wheel is kinematically associated.
  • the complete rotation of each pedal crank divides into two phases: a thrust phase and a recovery phase.
  • the pedal cranks are in one piece and rigid. Assuming no change of the gear ratio, the rotation speed can be changed only by changing the thrust impressed on the pedals, as it is not possible to vary the arm of the pedal crank.
  • the purpose of the present invention is to eliminate entirely or in part the drawbacks of the prior art mentioned above, by providing a mechanism for generating a rotation movement with double thrust lever having variable arm which is operationally reliable and at the same time simple to construct.
  • a further purpose of the present invention is to make available a mechanism for generating a rotation movement with double thrust lever having variable arm, which allows the application of the external thrust force on a point that moves along a circular or substantially circular traj ectory.
  • a further purpose of the present invention is to make available a mechanism for generating a rotation movement with double thrust lever having variable arm which can replace the traditional pedal crank/pedal generation mechanism of a bicycle, allowing the rider to further exploit the thrust impressed during the active rotation phase of each pedal, without interfering in the regularity of pedalling.
  • FIG. 1 shows a schematic view of a mechanism for generating a rotation movement with double thrust lever having variable arm according to a preferred embodiment of the invention, shown in an installation condition on a bicycle;
  • - Figure 2 shows four different positions adopted by a thrust lever with the relative thrust appendage and with the relative kinematic guide element in the mechanism for generating a rotation movement according to a preferred embodiment of the invention, respectively in the circular movement, a first position being shown at 3 o'clock, a second at 6 o'clock, a third at 9 o'clock and a fourth position at 12 o'clock;
  • FIG. 3 shows an orthogonal cross-section view of the thrust lever with the relative thrust appendage and with the relative kinematic guide element shown in Figure 2 according to the cross-section plane III-III indicated therein;
  • - Figure 4 shows a cross-section orthogonal view of the thrust lever illustrated in figure 2, along the cross- section plane IV-IV indicated in figure 3;
  • FIG. 5 shows a cross-section view of the kinematic guide element illustrated in figure 2, along the cross- section plane V-V indicated in figure 3;
  • FIG. 6 shows an enlarged view of the thrust lever with the relative thrust appendage and with the relative kinematic guide element shown in Figure 2 in the 3 o'clock position;
  • Figure 7 shows a rear perspective view of the thrust lever shown in Figure 6;
  • FIG. 8 shows an enlarged view of the thrust lever with the relative thrust appendage and with the relative kinematic guide element shown in Figure 2 in the 6 o'clock position;
  • Figure 9 shows a rear perspective view of the thrust lever shown in Figure 8.
  • FIG. 10 shows an enlarged view of the thrust lever with the relative thrust appendage and with the relative kinematic guide element shown in Figure 2 in the 9 o'clock position;
  • Figure 11 shows a rear perspective view of the thrust lever shown in Figure 10;
  • FIG. 12 shows an enlarged view of the thrust lever with the relative thrust appendage and with the relative kinematic guide element shown in Figure 2 in the 12 o'clock position;
  • Figure 13 shows a rear perspective view of the thrust lever shown in Figure 12.
  • reference numeral 1 globally denotes a mechanism for generating a rotation movement with double thrust lever having variable arm according to the present invention.
  • the mechanism 1 finds particular application as a movement mechanism of a bicycle.
  • the mechanism 1 according to the invention may also find other applications different from a bicycle, involving the generation of a circular movement through two pedal cranks or hand cranks, such as a handbike, in nautical craft such as pedal boats, or in double crank winches .
  • the mechanism for generating a rotation movement with double thrust lever having variable arm 1 comprises two thrust levers 11 and 12.
  • each thrust lever 11, 12 is associated at a first end portion 11' to a rotation pin 2, around which the aforementioned rotation movement develops so as to be rotationally integral with said pin 2 relative to the rotation axis XI of the pin.
  • Each thrust lever 11, 12 bears at a second end portion thereof 11", opposite the first, a thrust appendage 13, 14 which is destined to receive an external force such as to determine the rotation movement of the lever 11, 12.
  • the two thrust levers 11 and 12 are fixed to two opposite ends of the same common rotation pin 2 to extend in length, orthogonally to the rotation axis XI of the pin 2, in diametrically opposite positions with respect to the rotation axis XI. Their movement is thus in phase opposition, always staggered by 180°.
  • each thrust lever 11, 12 is divided into two phases, each corresponding to about one half revolution (about 180°):
  • each thrust lever 11, 12 has a variable length so that during the rotation movement of the thrust lever 11, 12 around the common rotation pin 2 the arm B, defined by the distance between the thrust appendage 13, 14 and the rotation axis XI of the pin 2, can vary.
  • the mechanism 1 comprises, coupled to each thrust lever 11, 12, a kinematic guide element suitable to guide the movement of variation in length of the coupled thrust lever 11, 12.
  • Each of the kinematic guide elements is constituted by an elongated body 111, which is associated at a first end portion 111 1 to said common rotation pin 2 in a rotationally neutral manner around the axis of rotation XI.
  • the rotationally neutral connection prevents the kinematic guide element from transferring thrust to the rotation pin 2 by means of the relative elongated element 111. Only the thrust lever 11, 12 is suitable to transfer to the rotation pin the force impressed on the thrust appendage 13, 14 as the angular momentum of rotation.
  • the kinematic guide element is associated to the rotation pin 2 by means of a rotatable connection with anti-friction means.
  • each kinematic guide element bears at its second end portion 111", opposite the first, a rotating support body 112, rotatably associated to the elongated body 111 at the second end portion 111" to rotate around a second axis X2 parallel to the axis of rotation XI of the common pin 2.
  • the aforesaid rotating support body 112 is associated to the elongated body 111 by antifriction means 113, such as bearings, ball or roller bearings or lubricating gaskets.
  • the elongated body 111 is defined by a rod provided at its second end 111 1 ' with a circular ring inside which an annular flange, which constitutes the rotating support body 112, is rotatably inserted around the second axis X2.
  • each thrust lever 11, 12 is rigidly fixed to the rotating support body 112 of the respective kinematic guide element in a radially eccentric position with respect to the second axis X2 so as to associate kinematically the kinematic guide element to the respective thrust lever 11, 12 by means of the aforesaid rotating support body 112.
  • the attachment point of the thrust appendage 13, 14 on the rotating support body 112 is indicated as X3.
  • the rigid attachment of the thrust appendage 13, 14 to the rotating support body 112 is designed to prevent a relative rotation between the two parts and thus make them integral in rotation.
  • the aforesaid rotating support body 112 may be in one piece with the respective thrust appendage 13, 14.
  • each thrust appendage 13, 14 engages the rotating support body 112 of the respective kinematic guide element in a direction parallel to the axis of rotation XI of the pin 2.
  • each thrust lever 11, 12 is parallel to the rotation plane of the respective kinematic guide element.
  • the rotation plane of each of the thrust levers 11, 12 is perpendicular to the axis of rotation XI of the pin 2.
  • Figure 2 refers in particular to the case where the mechanism 1 is inserted in a bicycle: the arrow A indicates the direction of advancement of the bicycle; the arrows R indicate the direction of rotation of the thrust lever 11, 12.
  • the thrust appendage 13, 14 - in its movement of rotation around the axis X2 integrally with the rotating support body 112 - drags alternately in axial lengthening and axial shortening the respective thrust lever 11, 12 imposing on the second end 11" of the thrust lever 11, 12 a circular movement.
  • this movement brings the thrust lever 11, 12 to oscillate alternately with respect to the longitudinal axis of the elongated body 111 of the kinematic guide element around the axis XI.
  • the distance between the second axis X2 of the rotating support body 112 and the rotation axis XI of the pin 2 is indicated as "D"
  • the eccentricity of the attachment point X3 of the thrust appendage on the rotating support body is indicated as "E” .
  • the attachment point X3 of the thrust appendage on the rotating support body can be considered substantially coincident with the point where the thrust received by the thrust appendage 13, 14 is discharged onto the thrust lever 11, 12.
  • the mechanism 1 according to the invention is illustrated with the thrust phase which corresponds to the position adopted in the 3 o'clock position (maximum value of the arm) and with the recovery phase which corresponds, instead, to the position adopted by the thrust appendage 13 in the 9 o'clock position (minimum value of the arm) .
  • the other two positions (12 o'clock and 6 o'clock) illustrate the thrust lever (with relative thrust appendage and kinematic guide element) in the two positions of passage respectively from the recovery phase to the thrust phase and from the thrust phase to the recovery phase.
  • the thrust appendage 13, 14 naturally adopts the positions described above, in the thrust phase and in the recovery phase, thanks to the free rotation of the rotating support body 112 and to the fact that the thrust appendage 13, 14 cannot rotate with respect to the rotating support body 15, 16.
  • the application of the force on the thrust appendage during the thrust phase tends to move the same appendage 13, 14 outwards and downwards, thereby favouring the direction of rotation of the second end 11" of the thrust lever around the rotating support body and its elongation.
  • the thrust appendage does not substantially undergo the application of external force to the mechanism. This allows the appendage and the rotating body to follow the same circular trajectory started by the appendage in the thrust phase.
  • a mechanism for generating a rotation movement with double thrust lever having variable arm allows the application of the external thrust force on a point (thrust appendage) that moves along a circular or substantially circular trajectory.
  • each thrust lever 11, 12 is variable in length thanks to the fact of having an extensible telescopic structure which extends axially along the longitudinal axis of said lever.
  • each thrust lever 11, 12 is axially rigid and is variable in length thanks to the fact of being slidingly associated to the rotation pin 2 parallel to the longitudinal extension axis of said lever.
  • the sliding stroke of the thrust lever with respect to the rotation pin determines the variation in length of the arm B of the thrust lever.
  • the thrust lever is equipped in this case with a limit stop 19.
  • the thrust lever 11, 12 can be attached indirectly to the rotation pin 2 by means of a support base 15, as illustrated in the appended figures, or may be attached directly to the rotation pin, for example by direct keying.
  • the kinematic guide element may be indirectly associated to the rotation pin 2 by said support base 15, although in a manner such as to ensure a neutral rotatable connection to the rotation pin.
  • the kinematic guide element can be attached directly to the rotation pin 2.
  • the thrust lever 11, 12 is slidingly attached to the rotation pin 2 by means of the aforesaid support base 15, so as to make assembly on the rotation pin 2 easier.
  • each of thrust levers 11, 12 is defined by two rods 16, 17 which are parallel to the longitudinal extension axis of the thrust lever 11, 12.
  • the two rods 16, 17 are fixed to the rotation pin 2 in such a way that the rotation axis XI is placed on the centreline between said two rods. This way there is a balanced distribution of the forces.
  • said two rods 16, 17 are connected to each other:
  • the two rods 16, 17 are slidingly associated to the support base 15, so that the thrust lever can vary its length and thus the arm offered by it.
  • the variation in length of the thrust lever may be obtained by equipping both rods 16, 17 with an axial telescopic structure.
  • each thrust lever 11, 12 can be defined by a single rod.
  • the change in length of the thrust lever may be obtained by connecting the single rod slidingly to the rotation pin (preferably by means of a support base) , or by equipping the single rod with an axial telescopic structure.
  • the mechanism 1 comprises transmission means of the rotation movement generated by the two thrust levers 11 and 12 on the rotation pin 2.
  • the aforesaid transmission means of the movement can be kinematically associated directly to the rotation pin 2 or to one of the two thrust levers 11 or 12.
  • These transmission means may be of any type suitable for the purpose and are not described here since they are known to a person skilled in the art.
  • they may consist of a toothed crown concentric with the axis of rotation XI of the pin and by a chain or belt transmission kinematically coupled to the toothed wheel.
  • the mechanism for generating a rotation movement with double thrust lever having variable arm according to the invention is particularly suitable to be used in applications that provide for the application of force by a human .
  • the two thrust levers 11, 12 are pedal crank and the relative thrust appendages 13, 14 are pedals.
  • FIG. 1 shows a frame S of a bicycle, where P indicates the toothed crown and Q the transmission chain.
  • the arrow A indicates the direction of advancement of the bicycle, while the arrows R indicate the direction of rotation of the thrust lever/ pedal crank.
  • the mechanism 1 according to the invention is suitable very well to replace the traditional pedal crank/pedal mechanisms having a fixed arm pedal crank and pedal rotating with respect to the pedal crank.
  • the mechanism 1 according to the invention allows the cyclist, being the force applied equal, to increase the speed thanks to the increase of the arm in the thrust phase.
  • the regularity of pedalling is not substantially influenced by the mechanism 1 given that the pedals (thrust appendages) follow a circular or substantially circular trajectory.
  • the mechanism 1 according to the invention allows the cyclist to perform regular and traditional pedalling, but to exercise a variable thrust action, more intense in the thrust phase, further exploiting the thrust impressed on the pedal.
  • a conventional pedal crank has a useful length/arm (distance between pin/hub and the pedal axis) of about 170 mm. Thanks to the invention, the pedal crank/ thrust levers 11, 12 of the mechanism 1 according to the invention in the thrust phase can increase the useful arm by about 60 - 80 mm, bringing the useful arm to 230-250 mm. In the recovery phase, the pedal cranks/ thrust levers 11, 12 of the mechanism 1 according to the invention shorten the arm by about 60 - 80 mm.
  • the present invention relates to a pedal- operated vehicle comprising a mechanism for generating a rotation movement with double thrust lever having variable arm according to the invention and in particular as described above, in which the aforesaid two thrust levers 11, 12 are pedal cranks and the relative thrust appendages 13, 14 are pedals.
  • the aforesaid pedal-operated vehicle is a bicycle.
  • the aforesaid pedal-operated vehicle may also be a nautical vehicle, in particular a pedal boat.
  • the two thrust levers 11, 12 are hand cranks and the relative thrust appendages 13, 14 are hand grips.
  • the mechanism 1 according to the invention may be applied in various actuating devices, such as double crank winches.
  • the operational and structural advantages mutatis mutandis - are similar to those already set forth with reference to the application to a bicycle.
  • the present invention relates to a handbike comprising a mechanism for generating a rotation movement with double thrust lever having variable arm according to the invention and in particular as described above, in which the aforesaid two thrust levers 11, 12 are hand cranks and the relative thrust appendages 13, 14 are hand grips .
  • the present invention relates to a double crank winch comprising a mechanism for generating a rotation movement with double thrust lever having variable arm according to the invention and in particular as described above, in which the aforesaid two thrust levers 11, 12 are hand cranks and the relative thrust appendages 13, 14 are hand grips.
  • the present invention also relates to a pedal crank assembly for pedal-operated vehicles, and in particular for a bicycle, comprising:
  • the pedal 13, 14 is rotatably associated with the second end portion 11 " of the thrust lever 11, 12.
  • the aforesaid thrust lever 11, 12 is variable in length so that during said rotation movement of the thrust lever 11, 12 around the aforesaid rotation pin the arm B, offered by the thrust lever and defined by the distance between the pedal 13, 14 and the rotation axis XI, can vary.
  • the aforesaid pedal crank assembly comprises a kinematic guide element suitable to guide the movement of variation in length of the thrust lever 11, 12.
  • the aforesaid kinematic guide element consists of an elongated body 111 suitable to be associated at a first end portion 111' to said rotation pin in a rotationally neutral manner around the axis of rotation XI of said rotation pin 2.
  • the elongated body 111 bears at a second end portion 111" thereof, opposite the first, a rotating support body 112, rotatably associated to the elongated body 111 at the second end portion 111" to rotate around a second axis X2 parallel to the axis of rotation XI of the common pin 2.
  • the pedal 13, 14 is rigidly fixed to the rotating support body 112 of the kinematic guide element in a radially eccentric position with respect to the second axis X2. This way, the pedal 13, 14 associates kinematically in rotation the kinematic guide element to the thrust lever 11, 12 by means of the aforesaid rotating support body 112.
  • the pedal crank assembly for a pedal- operated vehicle, and in particular for a bicycle, according to the invention is a component of the mechanism for generating a rotation movement with double thrust lever having variable arm according to the invention and in particular as described above.
  • the pedal crank assembly for a pedal- operated vehicle and in particular for a bicycle, can be considered as a separate element and be used to perform a retrofitting of an existing mechanism of the traditional type, replacing the traditional fixed-arm pedal cranks.
  • the pedal crank assembly according to the invention may be of a simple type without a toothed crown or may comprise a toothed crown P associated to the thrust lever 11, 12 at the first end portion 11'.
  • the toothed crown P may be associated to a support body 15 by means of which the thrust lever and the kinematic guide element can be associated to the rotation pin 2.
  • the mechanism for generating a rotation movement with double thrust lever having variable arm is operationally reliable and simple to construct .
  • the useful thrust arm varies automatically without the need for adjustment, increasing in the thrust phase of the single thrust lever (i.e. when the thrust lever is active in the generation of motion) , and decreasing in the recovery phase of the single thrust lever (i.e. when the thrust lever is not used for the generation of motion) .
  • the constructive simplicity of the mechanism 1 according to the invention is linked to the fact that compared to similar traditional mechanisms it entails: - realising the thrust lever as a variable- length element; and - coupling to each thrust lever, a kinematic guide element provided at its free end with a rotating support body which is connected eccentrically to the thrust lever by means of the thrust appendage.
  • a kinematic guide element has the function of guiding the elongation and the shortening of the thrust lever imposing a circular cyclicity related to the rotation of the rotating support body.
  • the operational reliability of the mechanism 1 is related to the fact that the mechanism does not require any adjustment system and to the fact that it allows the application of the external thrust force on a point that moves along a circular or substantially circular trajectory.
  • the mechanism 1 according to the invention does not affect the method of application of the external force, resulting from this point of view equivalent to traditional mechanisms.
  • the mechanism according to the invention finds a particularly preferred application as a mechanism generating movement for bicycles, in substitution of the traditional mechanisms with fixed arm pedal cranks. More specifically, the mechanism according to the invention allows the cyclist to better exploit the thrust impressed during the active rotation phase of each pedal, without however interfering with the regularity of pedalling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

La présente invention concerne un mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable, comprenant deux leviers de poussée (11, 12), dont chacun est associé, au niveau d'une première partie d'extrémité (11'), à une broche de rotation commune (2) de manière à être solidaire en rotation de ladite broche par rapport à l'axe de rotation (X1) de la broche et porte, au niveau de sa seconde partie d'extrémité (11"), un appendice de poussée (13, 14) qui est articulé sur le levier de poussée et est destiné à recevoir une force externe appropriée pour déterminer le mouvement de rotation du levier. Chaque levier de poussée présente une longueur variable de telle sorte que, pendant le mouvement de rotation autour de la broche de rotation commune (2), le bras (B), défini par la distance entre l'appendice de poussée respectif et l'axe de rotation (X1), peut varier. Le mécanisme comprend, pour chaque levier de poussée, un élément de guidage cinématique permettant de guider le mouvement de variation en longueur. Chaque élément de guidage cinématique est constitué d'un corps allongé (111) qui est associé, au niveau d'une première partie d'extrémité (111'), à la broche d'une manière neutre en rotation et qui porte, au niveau de sa seconde partie d'extrémité (111"), opposé au premier, un corps de support rotatif (112), associé de façon rotative au corps allongé (111) au niveau de la seconde partie d'extrémité pour tourner autour d'un second axe (X2) parallèle à l'axe de rotation (X1) de la broche (2). L'appendice de poussée est fixé rigidement au corps de support rotatif dans une position radialement excentrique par rapport au second axe (X2) de manière à associer cinématiquement l'élément de guidage cinématique au levier de poussée respectif.
PCT/IT2017/000026 2017-02-10 2017-02-10 Mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable Ceased WO2018146703A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/IT2017/000026 WO2018146703A1 (fr) 2017-02-10 2017-02-10 Mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable

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Application Number Priority Date Filing Date Title
PCT/IT2017/000026 WO2018146703A1 (fr) 2017-02-10 2017-02-10 Mécanisme de génération d'un mouvement de rotation à double levier de poussée à bras variable

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4631839A1 (fr) * 2024-04-10 2025-10-15 Pressofusione Saccense Srl Mécanisme à manivelle

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB109324A (en) * 1917-03-24 1917-09-13 Steel Nut & Joseph Hampton Ltd Improvements in Variable-throw Crank Mechanism for Bicycles, Tricycles and other Velocipedes.
FR2623769A1 (fr) * 1987-11-30 1989-06-02 Siligardi Giorgio Manivelle perfectionnee a pedale desaxee, pour bicyclette
US4882945A (en) * 1989-04-17 1989-11-28 Jose Trevizo Pedal extension device
CN2221546Y (zh) * 1995-07-05 1996-03-06 于健滋 脚拐长度可变的驱动装置
JP2000168668A (ja) * 1998-12-03 2000-06-20 Tadao Nagano 脚力による自転車の駆動機構
US6474193B1 (en) * 1999-03-25 2002-11-05 Sinties Scientific, Inc. Pedal crank
AT507144A1 (de) * 2008-08-05 2010-02-15 Gruber Robert Dipl Ing Tretkurbelantrieb
ES2571458A1 (es) * 2015-12-23 2016-05-25 Lopez Fernando Irujo Pedal para bicicleta, con bielas extensibles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB109324A (en) * 1917-03-24 1917-09-13 Steel Nut & Joseph Hampton Ltd Improvements in Variable-throw Crank Mechanism for Bicycles, Tricycles and other Velocipedes.
FR2623769A1 (fr) * 1987-11-30 1989-06-02 Siligardi Giorgio Manivelle perfectionnee a pedale desaxee, pour bicyclette
US4882945A (en) * 1989-04-17 1989-11-28 Jose Trevizo Pedal extension device
CN2221546Y (zh) * 1995-07-05 1996-03-06 于健滋 脚拐长度可变的驱动装置
JP2000168668A (ja) * 1998-12-03 2000-06-20 Tadao Nagano 脚力による自転車の駆動機構
US6474193B1 (en) * 1999-03-25 2002-11-05 Sinties Scientific, Inc. Pedal crank
AT507144A1 (de) * 2008-08-05 2010-02-15 Gruber Robert Dipl Ing Tretkurbelantrieb
ES2571458A1 (es) * 2015-12-23 2016-05-25 Lopez Fernando Irujo Pedal para bicicleta, con bielas extensibles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4631839A1 (fr) * 2024-04-10 2025-10-15 Pressofusione Saccense Srl Mécanisme à manivelle

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