WO2000056596A1 - Tread crank drive mechanism for a bicycle - Google Patents
Tread crank drive mechanism for a bicycle Download PDFInfo
- Publication number
- WO2000056596A1 WO2000056596A1 PCT/AT2000/000018 AT0000018W WO0056596A1 WO 2000056596 A1 WO2000056596 A1 WO 2000056596A1 AT 0000018 W AT0000018 W AT 0000018W WO 0056596 A1 WO0056596 A1 WO 0056596A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pedal
- pedal crank
- spring
- sections
- cranks
- Prior art date
Links
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 invention relates to a pedal crank drive for a bicycle with two rotatably connected crankshafts via a crankshaft, each consisting of two mutually limited pivotable sections, of which the outer, with respect to a stretched position of the pedal crank sections opposite to the pedaling direction compared to the inner section is resiliently supported in the direction of pedaling.
- this pedal crank extension which is dependent on the leg force used, is limited to a comparatively small angle of rotation between the pedal crank sections before the bottom dead center position of the pedal crank drive when the support spring is adapted to the maximum leg force, while the shorter pedal crank radius becomes effective in the area of the remaining crank rotation, the movement sequence becomes effective for the Cyclists essentially determined by the shorter pedal crank radius.
- the pedal crank extension which occurs only in some areas when the crank is turned, supports the power transmission, so that the cyclist feels a relief compared to conventional pedal crank drives with undivided pedal cranks, especially when driving uphill.
- the pedal crank consists of two separate sections, the joint between the pedal crank sections being formed by a leaf spring (FR 2 756 249 A1).
- FR 878 241 A the extended position of a pedal crank consisting of two articulated sections is secured by an elastic stop in order to dampen the impact of the outer pedal crank section pressed resiliently into the extended position, if this pedal crank section is pivoted back into the extended position after swiveling out the effective pedal crank length from the extended position by the spring between the two pedal crank sections.
- the invention is therefore an object of the invention to design a pedal crank drive for a bicycle of the type described in such a way that the extension of the effective crank radius in the range of the rotation angle in front of the lower one Dead center position of the pedal crank drive can be advantageously used without fear of "kicking back" of the outer pedal crank sections during the passage through the bottom dead center position.
- the invention solves this problem in that a pre-tensioned, the support spring of the outer portion counteracting damping spring is provided between the inner and the outer portion of the pedal cranks.
- the damping spring increasingly relaxes with increasing load on the support spring when the outer section is pivoted relative to the inner pedal crank section, the support spring can only relax against the force of the damping spring when the pedal crank is relieved, so that with one a suitable adjustment of the spring forces to one another, a gradual return rotation of the outer pedal crank section into its starting position can be ensured with the advantageous effect that a cyclist perceives the crank rotation as being uniform without noticeable delays or accelerations.
- the most favorable damping torque can be set via the preload of the damping spring, depending on the preload of the support spring.
- the damping spring and the support spring consist of leaf springs provided between the two sections of the pedal cranks, because in this case weight can be saved in comparison with coil springs.
- the support spring designed as a leaf spring forms the articulated connection between the inner and the outer section of the pedal cranks in a manner known per se.
- This measure eliminates the need for a complex design of a swivel joint between the two pedal crank sections.
- a further design simplification results from the fact that the support spring is formed in one piece with the two sections of the pedal crank, so that the spring force of the pedal crank material can be used for the mutual, resilient support of the two pedal crank sections.
- the pedal crank material shows sufficient elastic behavior, as is readily the case when the pedal cranks are made of spring steel.
- the spring force can be specified by appropriate dimensioning of the connecting part between the two pedal crank sections.
- FIG. 1 to 4 show different embodiments of a pedal crank drive according to the invention for a bicycle in a schematic side view of a pedal crank.
- the pedal crank drive has two pedal cranks 1 and 2, which are rotatably connected to each other via a crankshaft 3.
- This crankshaft 3 is supported by means of a rotary bearing 4 in a bicycle frame (not shown for reasons of clarity) and carries at least one ring gear for the bicycle chain.
- the pedal cranks 1, 2 are divided into two sections 5 and 6, the outer section 6, which forms the bearing eye 7 for a pedal, being inclined counter to the pedaling direction 8 in relation to a stretched position with respect to the inner section 5.
- the articulated division of the pedal cranks 1, 2 into the two sections 5 and 6 is achieved by a hinge joint 9.
- a support spring 10 which is designed according to FIG. 1 as a helical spring 11 and is extended to a hinge joint 9 beyond the extension 12 of the inner pedaling belabiteses 5 supports.
- the helical spring 11 can also be arranged between the inner section and a shoulder 12 of the outer section 6 which is extended beyond the hinge joint 9, as is indicated by dash-dotted lines.
- the support spring 10 and the damping spring 13 according to the embodiment of FIG. 2 are not designed as coil springs, but as leaf springs 14 and 15, respectively.
- the rotary stop between the two sections 5 and 6 of the pedal cranks 1, 2 can be achieved by the leaf spring 15 acting as a damping spring 13, as shown in FIG. 2 by the broken line Extended position of this leaf spring 15 can be seen.
- the embodiment according to FIG. 3 goes one step further compared to the embodiment according to FIG. 2 in terms of the design simplification, because the formation of a hinge joint 9 is dispensed with and the leaf springs 14 and 15 the articulated connection of the sections 5, 6 of the pedal cranks 1, 2 take over.
- the design of the support spring 10 as a separate leaf spring 14 is dispensed with at all and the one-piece connection between the sections 5 and 6 is designed as a spring hinge, which however requires the use of a corresponding spring-elastic material conditionally for pedal cranks 1, 2. Because of the leaf spring 14 connected in one piece to the sections 5 and 6, only a separate damping spring 13 is required, which not only creates the simplest design conditions, but also brings about a corresponding weight reduction.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
- Transmission Devices (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000606469A JP2002540003A (en) | 1999-03-22 | 2000-01-25 | Automotive pedal crank drive |
EP00902472A EP1163147A1 (en) | 1999-03-22 | 2000-01-25 | Tread crank drive mechanism for a bicycle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA508/99 | 1999-03-22 | ||
AT50899A AT407371B (en) | 1999-03-22 | 1999-03-22 | CRANKSET FOR A BICYCLE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000056596A1 true WO2000056596A1 (en) | 2000-09-28 |
Family
ID=3492473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2000/000018 WO2000056596A1 (en) | 1999-03-22 | 2000-01-25 | Tread crank drive mechanism for a bicycle |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1163147A1 (en) |
JP (1) | JP2002540003A (en) |
AT (1) | AT407371B (en) |
TW (1) | TW467840B (en) |
WO (1) | WO2000056596A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022107488A (en) * | 2021-01-08 | 2022-07-21 | 浩一 榎田 | Bicycle driving device and method etc. for increasing lives of sprocket and chain |
CH719891A2 (en) * | 2022-07-13 | 2024-01-31 | Grieco Leonardo | Bicycle with modified pedaling system and transmission system. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR878241A (en) * | 1941-08-20 | 1943-01-14 | Improvements made to kinematic and engine assemblies | |
DE2509021A1 (en) * | 1975-03-01 | 1976-09-02 | Wilhelm Roewer | Tilting pedal crank arm for bicycles - has pivoting outer crank section so pedals flop forward when at top |
DE3425342A1 (en) * | 1984-03-24 | 1986-01-16 | Günther 7505 Ettlingen Zschernitz | Articulated tread crank for bicycle |
FR2756249A1 (en) * | 1996-11-25 | 1998-05-29 | Egs Effective Gear Systems | Cycle crank arrangement |
-
1999
- 1999-03-22 AT AT50899A patent/AT407371B/en not_active IP Right Cessation
-
2000
- 2000-01-25 WO PCT/AT2000/000018 patent/WO2000056596A1/en not_active Application Discontinuation
- 2000-01-25 JP JP2000606469A patent/JP2002540003A/en active Pending
- 2000-01-25 EP EP00902472A patent/EP1163147A1/en not_active Ceased
- 2000-02-02 TW TW89101791A patent/TW467840B/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR878241A (en) * | 1941-08-20 | 1943-01-14 | Improvements made to kinematic and engine assemblies | |
DE2509021A1 (en) * | 1975-03-01 | 1976-09-02 | Wilhelm Roewer | Tilting pedal crank arm for bicycles - has pivoting outer crank section so pedals flop forward when at top |
DE3425342A1 (en) * | 1984-03-24 | 1986-01-16 | Günther 7505 Ettlingen Zschernitz | Articulated tread crank for bicycle |
FR2756249A1 (en) * | 1996-11-25 | 1998-05-29 | Egs Effective Gear Systems | Cycle crank arrangement |
Also Published As
Publication number | Publication date |
---|---|
TW467840B (en) | 2001-12-11 |
ATA50899A (en) | 2000-07-15 |
JP2002540003A (en) | 2002-11-26 |
AT407371B (en) | 2001-02-26 |
EP1163147A1 (en) | 2001-12-19 |
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