US20230399076A1 - Rear derailleur - Google Patents
Rear derailleur Download PDFInfo
- Publication number
- US20230399076A1 US20230399076A1 US17/839,942 US202217839942A US2023399076A1 US 20230399076 A1 US20230399076 A1 US 20230399076A1 US 202217839942 A US202217839942 A US 202217839942A US 2023399076 A1 US2023399076 A1 US 2023399076A1
- Authority
- US
- United States
- Prior art keywords
- cap member
- resistance
- resistance mechanism
- rear derailleur
- cap
- 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.)
- Granted
Links
- 230000008261 resistance mechanism Effects 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/121—Rear derailleurs
- B62M9/124—Mechanisms for shifting laterally
- B62M9/1248—Mechanisms for shifting laterally characterised by the use of biasing means, e.g. springs; Arrangements thereof
-
- 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
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/121—Rear derailleurs
- B62M9/124—Mechanisms for shifting laterally
- B62M9/1242—Mechanisms for shifting laterally characterised by the linkage mechanisms
-
- 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
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/121—Rear derailleurs
- B62M9/126—Chain guides; Mounting thereof
Definitions
- the present invention relates to a rear derailleur.
- the transmission system of bicycle is designed to be capable of being shifted with many speeds to respond to various operation conditions and road surfaces.
- a conventional transmission system includes a chain, flywheel, derailleur and associated control devices.
- the deraille can be classified into front derailleur and rear derailleurs.
- the front derailleur is mounted to the sprocket, and the rear derailleur is mounted to the flywheel, such as that disclosed in TW 1580610.
- the pivot shaft and the external members are formed to be an integral unit, the control cam and the adjusting cam can be driven by the control lever to jointly clamp against the friction applying member, so that the friction applying member applies a frictional resistance to the external member, thereby making the pivot shaft not easy to rotate, which ensures that the chain guide is not easy to act arbitrarily.
- the friction applying member is prone to elasticity fatigue and deformation and fracture due to long-term use, and cannot effectively provide frictional resistance to the external member, resulting in reduced efficacy or even malfunction.
- the control lever is prone to arbitrary swing and fractures due to unexpected collisions. This is not conducive to the stability of the mechanism and the structural durability.
- the control lever is also prone to accumulation of dirt, and it is difficult to clean.
- the present invention is, therefore, arisen to obviate or at least mitigate the above-mentioned disadvantages.
- the main object of the present invention is to provide a rear derailleur which has good stability and reliability during use, has the advantages of convenient and intuitive operation, and is easy to clean and maintain.
- FIG. 1 is a stereogram of a preferable embodiment of the present invention
- FIG. 3 is a second breakdown drawing of a preferable embodiment of the present invention.
- FIG. 4 is a partial cross-sectional of FIG. 1 ;
- a rear derailleur of the present invention includes a base 1 , a linkage assembly 2 , a movable member 3 , a chain guide 4 , a biasing member 6 , a resistance mechanism 7 and a cap member 8 .
- the biasing member 6 is located between the movable member 3 and the chain guide 4 , one end of the biasing member 6 is positioned to the movable member 3 , and another end of the biasing member 6 is positioned to the chain guide 4 , so that the chain guide 4 is pre-biased and not freely rotatable.
- the resistance mechanism 7 is connected to the movable member 3 and provides additional resistance to the axle assembly 5 , which provides selectively different rotary resistances to the chain guide 4 . In this embodiment, the resistance mechanism 7 is disposed around the axle assembly 5 .
- the cap member 8 covers the resistance mechanism 7 and drives the resistance mechanism 7 , and the cap member 8 is rotatable relative to the movable member 3 .
- the cap member 8 is movable with the resistance mechanism 7 , and the rider can simply rotate the cap member 8 to drive the resistance mechanism 7 .
- the operation is quite convenient and intuitive, and the overall mechanism has the advantages of requiring less components and simple structure.
- two objects that collide with each other mostly move linearly, while the actuation of the cap member 8 requires rotation of the cap member 8 , so when an unexpected collision occurs, the cap member 8 is less likely to move easily, and it has better performance and stable reliability.
- the cap member 8 is externally operable and covers the resistance mechanism 7 , and the first resistance is greater than the second resistance. That is, the chain guide 4 is harder to rotate when the cap member 8 is in the first position than when the cap member 8 is in the second position, and thus it is suitable for riding on bumpy roads, and can effectively suppress the occurrence of chain throwing; in contrast, the chain guide 4 is easier to rotate when the cap member 8 is in the second position than when the cap member 8 is in the first position, an thus it is suitable for users to disassemble the rear wheel, mount the chain, adjust the speed shift, and operate other assembly and adjustment matters.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
A rear derailleur is provided, including: a base, configured to be mounted to a bicycle; a linkage assembly, connected to the base; a movable member, rotatably connected to the linkage assembly; a chain guide, rotatably connected to the movable member by an axle assembly; a biasing member, located between the movable member and the chain guide, positioned to the movable member and the chain guide; a resistance mechanism, connected to the movable member; and a cap member, covering the resistance mechanism and driving the resistance mechanism, rotatably positionable in either of a first position and a second position, wherein when the cap member is positioned in the first position, the resistance mechanism provides a first resistance, and when the cap member is positioned in the second position, the resistance mechanism provides a second resistance which is different from the first resistance.
Description
- The present invention relates to a rear derailleur.
- The transmission system of bicycle is designed to be capable of being shifted with many speeds to respond to various operation conditions and road surfaces. A conventional transmission system includes a chain, flywheel, derailleur and associated control devices. The derailleurs can be classified into front derailleurs and rear derailleurs. The front derailleur is mounted to the sprocket, and the rear derailleur is mounted to the flywheel, such as that disclosed in TW 1580610.
- In TW 1580610, the pivot shaft and the external members are formed to be an integral unit, the control cam and the adjusting cam can be driven by the control lever to jointly clamp against the friction applying member, so that the friction applying member applies a frictional resistance to the external member, thereby making the pivot shaft not easy to rotate, which ensures that the chain guide is not easy to act arbitrarily.
- However, the friction applying member is prone to elasticity fatigue and deformation and fracture due to long-term use, and cannot effectively provide frictional resistance to the external member, resulting in reduced efficacy or even malfunction. Moreover, the control lever is prone to arbitrary swing and fractures due to unexpected collisions. This is not conducive to the stability of the mechanism and the structural durability. Furthermore, the control lever is also prone to accumulation of dirt, and it is difficult to clean.
- The present invention is, therefore, arisen to obviate or at least mitigate the above-mentioned disadvantages.
- The main object of the present invention is to provide a rear derailleur which has good stability and reliability during use, has the advantages of convenient and intuitive operation, and is easy to clean and maintain.
- To achieve the above and other objects, a rear derailleur is provided, including: a base, configured to be mounted to a bicycle; a linkage assembly, connected to the base; a movable member, rotatably connected to the linkage assembly; a chain guide, rotatably connected to the movable member by an axle assembly; a biasing member, located between the movable member and the chain guide, positioned to the movable member and the chain guide; a resistance mechanism, connected to the movable member; and a cap member, covering the resistance mechanism and driving the resistance mechanism, rotatably positionable in either of a first position and a second position, wherein when the cap member is positioned in the first position, the resistance mechanism provides a first resistance, and when the cap member is positioned in the second position, the resistance mechanism provides a second resistance which is different from the first resistance.
- The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
-
FIG. 1 is a stereogram of a preferable embodiment of the present invention; -
FIG. 2 is a first breakdown drawing of a preferable embodiment of the present invention; -
FIG. 3 is a second breakdown drawing of a preferable embodiment of the present invention; -
FIG. 4 is a partial cross-sectional ofFIG. 1 ; -
FIG. 5 is a drawing showing a pawl and a ratchet member engaged with each other according to a preferable embodiment of the present invention; -
FIG. 6 is a drawing showing the pawl and the ratchet member disengaged from each other according to a preferable embodiment of the present invention; and -
FIG. 7 is a drawing showing a cap member of a preferable embodiment of the present invention. - Please refer to
FIGS. 1 to 7 for a preferable embodiment of the present invention. A rear derailleur of the present invention includes a base 1, alinkage assembly 2, amovable member 3, achain guide 4, abiasing member 6, aresistance mechanism 7 and acap member 8. - The base 1 is configured to be mounted to a bicycle. The
linkage assembly 2 is connected to the base 1. Themovable member 3 is rotatably connected to thelinkage assembly 2, which allows the adjustment of themovable member 3 relative to the base 1. Thechain guide 4 is rotatably connected to themovable member 3 by anaxle assembly 5 so that thechain guide 4 is rotatable with theaxle assembly 5. - The
biasing member 6 is located between themovable member 3 and thechain guide 4, one end of thebiasing member 6 is positioned to themovable member 3, and another end of thebiasing member 6 is positioned to thechain guide 4, so that thechain guide 4 is pre-biased and not freely rotatable. Theresistance mechanism 7 is connected to themovable member 3 and provides additional resistance to theaxle assembly 5, which provides selectively different rotary resistances to thechain guide 4. In this embodiment, theresistance mechanism 7 is disposed around theaxle assembly 5. - The
cap member 8 covers theresistance mechanism 7 and drives theresistance mechanism 7, and thecap member 8 is rotatable relative to themovable member 3. In other words, thecap member 8 is movable with theresistance mechanism 7, and the rider can simply rotate thecap member 8 to drive theresistance mechanism 7. The operation is quite convenient and intuitive, and the overall mechanism has the advantages of requiring less components and simple structure. In addition, when colliding, two objects that collide with each other mostly move linearly, while the actuation of thecap member 8 requires rotation of thecap member 8, so when an unexpected collision occurs, thecap member 8 is less likely to move easily, and it has better performance and stable reliability. - Specifically, the
cap member 8 is rotatably positioned in a first position or second position. When thecap member 8 is positioned in the first position, theresistance mechanism 7 provides a first resistance, and when thecap member 8 is positioned in the second position, theresistance mechanism 7 provides a second resistance which is different from the first resistance. As a result, the ability of anti-rotation of thechain guide 4 is adjustable according to various requirements. - In this embodiment, the
cap member 8 is externally operable and covers theresistance mechanism 7, and the first resistance is greater than the second resistance. That is, thechain guide 4 is harder to rotate when thecap member 8 is in the first position than when thecap member 8 is in the second position, and thus it is suitable for riding on bumpy roads, and can effectively suppress the occurrence of chain throwing; in contrast, thechain guide 4 is easier to rotate when thecap member 8 is in the second position than when thecap member 8 is in the first position, an thus it is suitable for users to disassemble the rear wheel, mount the chain, adjust the speed shift, and operate other assembly and adjustment matters. - In this embodiment, the
resistance mechanism 7 includes aratchet member 71 and apawl 72, theratchet member 71 is rotatable with theaxle assembly 5, and thepawl 72 is movably disposed on themovable member 3. When thecap member 8 rotates from the second position toward the first position, thecap member 8 drives thepawl 72 to engage with theratchet member 71 so that theresistance mechanism 7 provides the first resistance to sufficiently prevent the reversing rotation and throwing of thechain guide 4 during riding on bumpy roads. When thecap member 8 rotates from the first position toward the second position (i.e., thecap member 8 is in the second position), thecap member 8 releases thepawl 72 so that thepawl 72 is disengageable from theratchet member 71, where thechain guide 4 is movable with theresistance mechanism 7. - Preferably, the rear derailleur further includes a driven
mechanism 9, and thecap member 8 is movable with theresistance mechanism 7 through the drivenmechanism 9. Specifically, the drivenmechanism 9 includes a pushingmember 91 and anelastic member 92, theelastic member 92 is elastically abutted between thecap member 8 and the pushingmember 91, and thecap member 8 is movable with the pushingmember 91. When thecap member 8 rotates from the second position toward the first position, thecap member 8 drives theelastic member 92 to move the pushingmember 91 to push thepawl 72 to engage with theratchet member 71. When thecap member 8 rotates from the first position toward the second position, theelastic member 92 is not compressed, theratchet member 71 can be released because thepawl 72 moves to disengage from theratchet member 71 due to the gravity or because theratchet member 71 is reversed to push thepawl 72 to retract the pushingmember 91. - In this embodiment, the pushing
member 91 is a sleeve, an end of theelastic member 92 is inserted in the pushingmember 91, and another end of theelastic member 92 is inserted in arecess 81 of thecap member 8, so that theelastic member 92 is well limited and prevented from falling out. - The
cap member 8 includes aseat 83 and acap body 84, theseat 83 is detachably mounted to themovable member 3, and theseat 83 includes anoperation space 831. Theresistance mechanism 7 is received in theoperation space 831, for blocking foreign matters (such as dust, small gravel, muddy, water or the like), thus ensuring that theresistance mechanism 7 can operate smoothly. Thecap body 84 is rotatably connected to and covers theseat 83 and theoperation space 831, thus sufficiently blocking foreign matters. Thecap body 84 is rotatably positionable in the first position or in the second position. Theelastic member 92 is elastically abutted between thecap body 84 and the pushingmember 91. - Preferably, one of the
seat 83 and thecap body 84 includes afirst positioning unit 82, and the other of theseat 83 and thecap body 84 includes asecond positioning unit 34 and athird positioning unit 35. When thecap member 8 is in the first position, thefirst positioning unit 82 and thesecond positioning unit 34 are engaged with each other so that thecap member 8 is positioned in the first position. Similarly, when thecap member 8 is in the second position, thefirst positioning unit 82 and thethird positioning unit 35 are engaged with each other so that thecap member 8 is positioned in the second position. - In this embodiment, the
cap member 8 includes thefirst positioning unit 82, theseat 83 includes thesecond positioning unit 34 and thethird positioning unit 35, thefirst positioning unit 82 is an elastic member, and thesecond positioning unit 34 and thethird positioning unit 35 are each a recess. - Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (10)
1. A rear derailleur, including:
a base, configured to be mounted to a bicycle;
a linkage assembly, connected to the base;
a movable member, rotatably connected to the linkage assembly;
a chain guide, rotatably connected to the movable member by an axle assembly;
a biasing member, located between the movable member and the chain guide, positioned to the movable member and the chain guide;
a resistance mechanism, connected to the movable member; and
a cap member, covering the resistance mechanism and driving the resistance mechanism, rotatably positionable in either of a first position and a second position, wherein when the cap member is positioned in the first position, the resistance mechanism provides a first resistance, and when the cap member is positioned in the second position, the resistance mechanism provides a second resistance which is different from the first resistance.
2. The rear derailleur of claim 1 , wherein the first resistance is greater than the second resistance.
3. The rear derailleur of claim 1 , wherein the chain guide is rotatable with the axle assembly.
4. The rear derailleur of claim 1 , wherein the resistance mechanism is disposed around the axle assembly.
5. The rear derailleur of claim 1 , wherein the cap member is rotatable relative to the movable member.
6. The rear derailleur of claim 1 , wherein when the cap member is in the second position, the chain guide is movable with the resistance mechanism.
7. The rear derailleur of claim 1 , wherein the cap member is externally operable and covers the resistance mechanism, and the chain guide is harder to rotate when the cap member is in the first position than when the cap member is in the second position.
8. The rear derailleur of claim 1 , wherein the cap member is externally operable and covers the resistance mechanism, and the chain guide is easier to rotate when the cap member is in the second position than when the cap member is in the first position.
9. The rear derailleur of claim 1 , wherein the resistance mechanism includes a ratchet member and a pawl, the ratchet member is rotatable with the axle assembly, the pawl is movably disposed on the movable member, when the cap member rotates from the second position toward the first position, the cap member drives the pawl to engage with the ratchet member, and when the cap member rotates from the first position toward the second position, the cap member releases the pawl so that the pawl is disengageable from the ratchet member.
10. The rear derailleur of claim 9 , wherein further including a driven mechanism, the driven mechanism includes a pushing member and an elastic member, and the elastic member is elastically abutted between the cap member and the pushing member; when the cap member rotates from the second position toward the first position, the cap member drives the pushing member to push the pawl to engage with the ratchet member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US17/839,942 US11834131B1 (en) | 2022-06-14 | 2022-06-14 | Rear derailleur |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US17/839,942 US11834131B1 (en) | 2022-06-14 | 2022-06-14 | Rear derailleur |
Publications (2)
Publication Number | Publication Date |
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US11834131B1 US11834131B1 (en) | 2023-12-05 |
US20230399076A1 true US20230399076A1 (en) | 2023-12-14 |
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US17/839,942 Active 2042-07-21 US11834131B1 (en) | 2022-06-14 | 2022-06-14 | Rear derailleur |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107434007A (en) * | 2016-05-25 | 2017-12-05 | 台湾微转股份有限公司 | The use pattern switching mechanism of bicycle chain puller |
EP3772453A1 (en) * | 2019-08-08 | 2021-02-10 | SRAM Deutschland GmbH | Bicycle derailleur, in particular with a spring-damper assembly |
US20220144380A1 (en) * | 2020-11-09 | 2022-05-12 | Rush Components Llc | Stabilizer |
US20220177076A1 (en) * | 2020-12-03 | 2022-06-09 | Campagnolo S.R.L. | Bicycle gearshift |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8852041B2 (en) | 2010-09-30 | 2014-10-07 | Shimano, Inc. | Bicycle derailleur with rotation resistance |
-
2022
- 2022-06-14 US US17/839,942 patent/US11834131B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107434007A (en) * | 2016-05-25 | 2017-12-05 | 台湾微转股份有限公司 | The use pattern switching mechanism of bicycle chain puller |
EP3772453A1 (en) * | 2019-08-08 | 2021-02-10 | SRAM Deutschland GmbH | Bicycle derailleur, in particular with a spring-damper assembly |
US20220144380A1 (en) * | 2020-11-09 | 2022-05-12 | Rush Components Llc | Stabilizer |
US20220177076A1 (en) * | 2020-12-03 | 2022-06-09 | Campagnolo S.R.L. | Bicycle gearshift |
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US11834131B1 (en) | 2023-12-05 |
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