WO2002092418A1 - A device for prolonging the pedal cranks of a bicycle during the pushing phase - Google Patents

A device for prolonging the pedal cranks of a bicycle during the pushing phase Download PDF

Info

Publication number
WO2002092418A1
WO2002092418A1 PCT/IT2001/000492 IT0100492W WO02092418A1 WO 2002092418 A1 WO2002092418 A1 WO 2002092418A1 IT 0100492 W IT0100492 W IT 0100492W WO 02092418 A1 WO02092418 A1 WO 02092418A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever arms
pedal cranks
projections
pedal
sliding
Prior art date
Application number
PCT/IT2001/000492
Other languages
French (fr)
Inventor
Bruno Peddis
Original Assignee
Bruno Peddis
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 Bruno Peddis filed Critical Bruno Peddis
Publication of WO2002092418A1 publication Critical patent/WO2002092418A1/en

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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

Definitions

  • the present invention concerns a device for prolonging the pedal cranks of a bicycle during the pushing phase, for realizing pedal strokes without discontinuity and dead points during rotation.
  • - pedal cranks provided with housings for containing ball bearings and 25 projections carrying the pedals, said projections are provided with cavities, that allow the sliding of lever arms; - lever arms sliding inside the projections of the pedal cranks, linked with sliders in turn sliding on special brackets having their fulcrum in the pins of the bicycle hub or similar, in a position orthogonal to said lever arms;
  • Figures 1 and 2 respectively show a left and right lateral view of a device for prolonging the pedal cranks according to the present invention, as applied to a competition bicycle B, while figure 3 shows an exploded view of the same.
  • FIGS 4, 5, 6 and 7 show the different prolonging and shortening positions obtained by the pedal cranks during the resting, pushing and climbing phases of pedals P.
  • the enclosed figures show an improvement of the devices for prolonging the pedal cranks of bicycles in the pushing phase, consisting of:
  • a housing 1 realized on the frame T of a bicycle B in an eccentric position to a hub M of the icycle, and that contains pedal cranks 2 and bearings 3 which will facilitate their movement, and which are kept in position by special blocking nuts 4;
  • pedal cranks 2 provided with housings 5 for containing ball bearings 3, kept by a blocking bottom 6, and for projections 7 carrying pedals P, said projections are provided with cavities 8 which allow the sliding of lever arms 9;
  • the push exerted onto pedals P starts the rotation of pedal cranks 2 inside the special housing 1 on said frame T of said bicycle B, kept in position on the corresponding bearings 3 by said blocking nuts 4 and by said brackets 13 carrying said lever arms 9 on said pins PN of said hub M of the bicycle.

Landscapes

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

Abstract

A device for prolonging the pedal cranks of a bicycle during the pushing phase, for realizing pedal strokes without discontinuity and dead points during rotation, comprising: - a housing (1) for a pedal crank (2) and bearings (3) that facilitate the movement thereof; - pedal cranks (2) provided with housings (5) for containing the ball bearings (3) and projections (7) carrying pedals (P), said projections (7) are provided with cavities (8) that allow the sliding of lever arms (9); - lever arms (9) sliding inside said projections (7) of the pedal cranks (2), linked with sliders (12) in turn sliding on special brackets (13) having their fulcrum in the pins PM of the bicycle hub (M) or similar, in a position orthogonal to said lever arms; - a crown (C) shaped in such a way as to allow the working of said pedal cranks (2) and of said lever arms (9) without interfering with the drive of the gear group and with the transmission gearing, usually present in competition bicycles.

Description

A DEVICE FOR PROLONGING THE PEDAL CRANKS OF A BICYCLE DURING THE PUSHING PHASE
5 The present invention concerns a device for prolonging the pedal cranks of a bicycle during the pushing phase, for realizing pedal strokes without discontinuity and dead points during rotation.
From a previous document WO 00/43263 in the name of the same applicant 10 an improvement of the devices for prolonging the pedal cranks of bicycles during the pushing phase is known, which - even if considerably improving the rotation of the pedal cranks with respect to the precedent devices known to the art, while testing still showed the presence of little but noticeable accelerations in correspondence with the dead points of rotation.
15
It is the aim of the present invention to eliminate above mentioned functional inconveniences of the precedent device by means of a different structure and a different functional coupling of the elements of said device.
20 The aim set forth is reached by an improved device according to the present invention, comprising:
- a housing for the pedal cranks and bearings that facilitate the movement thereof;
- pedal cranks provided with housings for containing ball bearings and 25 projections carrying the pedals, said projections are provided with cavities, that allow the sliding of lever arms; - lever arms sliding inside the projections of the pedal cranks, linked with sliders in turn sliding on special brackets having their fulcrum in the pins of the bicycle hub or similar, in a position orthogonal to said lever arms;
- a crown shaped in such a way as to allow the working of said pedal cranks and of said lever arms without interfering with the drive of the gear group and with the transmission gearing, usually present in competition bicycles.
The present invention will be described more in detail hereinbelow relating to the enclosed drawings in which an embodiment is shown.
Figures 1 and 2 respectively show a left and right lateral view of a device for prolonging the pedal cranks according to the present invention, as applied to a competition bicycle B, while figure 3 shows an exploded view of the same.
Figures 4, 5, 6 and 7 show the different prolonging and shortening positions obtained by the pedal cranks during the resting, pushing and climbing phases of pedals P.
The enclosed figures show an improvement of the devices for prolonging the pedal cranks of bicycles in the pushing phase, consisting of:
- a housing 1 , realized on the frame T of a bicycle B in an eccentric position to a hub M of the icycle, and that contains pedal cranks 2 and bearings 3 which will facilitate their movement, and which are kept in position by special blocking nuts 4; - pedal cranks 2 provided with housings 5 for containing ball bearings 3, kept by a blocking bottom 6, and for projections 7 carrying pedals P, said projections are provided with cavities 8 which allow the sliding of lever arms 9;
- lever arms 9, sliding inside the projections of pedal cranks 2 by means of ball bearings 10 inserted into grooved guides 11, linked to slides 12 in turn sliding on special brackets 13 by means of bearings 10' and guides 11", having their fulcrum in pins PN of the hub M of the bicycle B, in a position orthogonal to said lever arms;
- a crown C shaped in such a way as to allow the working of said pedal cranks 2 and of said lever arms 9 without interfering with the drive of the gear group and with the transmission gear usually present on competition bicycles.
As far as the working of the device for prolonging the pedal cranks of a bicycle during the pushing phase, for realizing pedal strokes without discontinuity and dead points during rotation according to the present invention is concerned, the push exerted onto pedals P starts the rotation of pedal cranks 2 inside the special housing 1 on said frame T of said bicycle B, kept in position on the corresponding bearings 3 by said blocking nuts 4 and by said brackets 13 carrying said lever arms 9 on said pins PN of said hub M of the bicycle.
Due to the different rotation centres, the distance between the end of said projections 7 carrying said pedals P and the fulcrum of said lever arms 9 tends to increase in the pushing phase on the pedals and to decrease during the climbing phase, thus determining a proportional sliding of said pushing arms 9 inside said cavities 8 of the pedal cranks' 2 projections. Now this sliding determines, in the pushing phase, a total prolongation of the lever arms which causes in turn an increase of the power applied by said arm to pedals P and a following increase of the moment transmitted to the wheels as well as a shortening of said lever arms in the climbing phase.
Furthermore, as shown in figures 4, 5, 6 and 7, the sliding of the lever arms 9 onto the brackets 13, through the slides 12 linked to said lever arms, corresponds to the sliding of said arms 9 inside the cavities of the projections 7, due to the rotation of said brackets 13 onto the pins PN of the hub M determined by the action of the pedal cranks 2.
The combination of above mentioned movements seems to be able to prevent mechanical blocks of the system, thus assuring the perfect alignment of the elements in reciprocal rotation, as well as to obtain a pedal stroke without discontinuity nor dead points and keeping a constant distance between the rotation centre of the pedal cranks 2 and the end of the projections 7 carrying the pedals P, in any moment of said rotation.

Claims

1. A device for prolonging the pedal cranks of a bicycle during the pushing phase, for realizing pedal strokes without discontinuity and dead points during rotation, characterized in: - a housing (1), realized on the frame (T) of a bicycle (B) in an eccentric position to a hub (M) of the bicycle, and that contains pedal cranks (2) and bearings (3) which will facilitate the movement of said pedal cranks, and which are kept in position by special blocking nuts (4);
- pedal cranks (2) provided with housings (5) for containing ball bearings (3), kept by a blocking bottom (6), and for projections (7) carrying pedals (P), said projections are provided with cavities (8) which allow the sliding of lever arms (9);
- lever arms (9), sliding inside the projections (7) of said pedal cranks (2) by means of ball bearings (10) inserted into grooved guides (11), linked to slides (12) in turn sliding on special brackets (13) by means of bearings (10') and guides (11'), said brackets (13) having the fulcrum in pins (PN) of the hub (M) of the bicycle (B), in a position orthogonal to said lever arms;
- a crown (C) shaped in such a way as to allow the working of said pedal cranks (2) and of said lever arms (9) without interfering with the drive of the gear group and with the transmission gear usually present on competition bicycles, so that the proportional sliding of said lever arms (9) inside said cavities (8) of the pedals' (2) projections (7) determines, in the pushing phase, a total prolongation of the lever arms which causes in turn an increase of the power applied to the pedals (P) and a following increase of the moment transmitted to the wheels as well as a shortening of said lever arms (9) in the climbing phase.
2. A device according to claim 1 , characterized in that the sliding of the lever arms (9) onto said brackets (13), through slides (12) linked to the said lever arms, corresponds to the sliding of said lever arms (9) inside the cavities of said projections (7), due to the rotation of said brackets onto said pins (PN) of the hub (M) determined by the action of said pedal cranks (2), so that the combination of said movements prevents mechanical blocks, thus assuring the perfect alignment of the elements in reciprocal rotation, obtains a pedal stroke without discontinuity nor dead points and keeps a constant distance between the rotation centre of the pedal cranks (2) and the end of said projections (7) carrying the pedals (P), in any moment of said rotation.
PCT/IT2001/000492 2001-05-15 2001-09-25 A device for prolonging the pedal cranks of a bicycle during the pushing phase WO2002092418A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2001A000256 2001-05-15
IT2001RM000256A ITRM20010256A1 (en) 2001-05-15 2001-05-15 EXTENSION DEVICE FOR CYCLING PEDALS IN THE PUSHING PHASE, FOR PEDALES WITHOUT DISCONTINUITY AND DEAD POINTS.

Publications (1)

Publication Number Publication Date
WO2002092418A1 true WO2002092418A1 (en) 2002-11-21

Family

ID=11455526

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2001/000492 WO2002092418A1 (en) 2001-05-15 2001-09-25 A device for prolonging the pedal cranks of a bicycle during the pushing phase

Country Status (2)

Country Link
IT (1) ITRM20010256A1 (en)
WO (1) WO2002092418A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005082702A1 (en) * 2004-02-26 2005-09-09 Bruno Peddis A bicycle frame with a rear fork and with a housing for a device for improving the efficiency of the push on the pedal
WO2006034052A1 (en) * 2004-09-17 2006-03-30 Schuft Charles F Pedal drive
IT201800001109A1 (en) * 2018-01-16 2019-07-16 Torino Politecnico Crank arm unit with extendable pedal holder insert and torque recovery

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093201A2 (en) * 1982-04-30 1983-11-09 Freder Stuckenbrok Driving means for bicycles and the like
GB2324988A (en) * 1997-05-07 1998-11-11 Lawrence Richard Geor Blackett Increasing crank leverage particularly for bicycle propulsion
WO2000043263A1 (en) 1999-01-22 2000-07-27 Bruno Peddis A device for the extension of the pedals of a bicycle during the pushing phase

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093201A2 (en) * 1982-04-30 1983-11-09 Freder Stuckenbrok Driving means for bicycles and the like
GB2324988A (en) * 1997-05-07 1998-11-11 Lawrence Richard Geor Blackett Increasing crank leverage particularly for bicycle propulsion
WO2000043263A1 (en) 1999-01-22 2000-07-27 Bruno Peddis A device for the extension of the pedals of a bicycle during the pushing phase

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005082702A1 (en) * 2004-02-26 2005-09-09 Bruno Peddis A bicycle frame with a rear fork and with a housing for a device for improving the efficiency of the push on the pedal
WO2006034052A1 (en) * 2004-09-17 2006-03-30 Schuft Charles F Pedal drive
IT201800001109A1 (en) * 2018-01-16 2019-07-16 Torino Politecnico Crank arm unit with extendable pedal holder insert and torque recovery

Also Published As

Publication number Publication date
ITRM20010256A1 (en) 2002-11-15
ITRM20010256A0 (en) 2001-05-15

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