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Rear Derailleur Bracket

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Rear Derailleur Bracket Europaisches Patentamt J European Patent Office © Publication number: 0 609 834 A1 Office europeen des brevets EUROPEAN PATENT APPLICATION © Application number: 94101469.8 int. CIA B62M 9/12, B62K 19/30, B62K 25/02 @ Date of filing: 01.02.94 © Priority: 03.02.93 JP 2389/93 © Applicant: SHIMANO INC. 77, Oimatsucho 3 cho @ Date of publication of application: Sakai-shi 10.08.94 Bulletin 94/32 Osaka (JP) © Designated Contracting States: @ Inventor: Ando, Yoshiaki, c/o Shimano Inc. DE FR GB IT 77, Oimatsucho 3-cho Sakai-shi, Osaka (JP) © Representative: Grosse, Wolfgang, Dipl.-lng. et al Patentanwalte Herrmann-Trentepohl, Kirschner Grosse, Bockhorni & Partner Forstenrieder Allee 59 D-81476 Munchen (DE) (§v Rear derailleur bracket. © A rear derailleur bracket for connecting a rear FIG.5 derailleur to a bicycle frame, utilizing a coupling device formed on a derailleur mounting extension (14) of a rear fork end (51) of the bicycle frame. The rear derailleur bracket includes a bracket body (8), a first bolt bore (8a) provided adjacent one end of the bracket body for connecting the rear derailleur to the bracket body, a second bolt bore (8b) provided adjacent the other end of the bracket body for con- necting the bracket body to the coupling device of the bicycle frame, and a projection (8c) acting as a position setting device for contacting the derailleur mounting extension to place the rear derailleur in a 00 predetermined posture relative to the rear fork end 00 (51). The projection extends substantially vertically from a surface of the bracket body. o> o CO Rank Xerox (UK) Business Services (3. 10/3.09/3.3.4) 1 EP 0 609 834 A1 2 BACKGROUND OF THE INVENTION connecting the rear derailleur to the bracket body; second connecting means provided adjacent the FIELD OF THE INVENTION other end of the bracket body for connecting the bracket body to the coupling device of the bicycle The present invention relates to a rear derail- 5 frame; and position setting means for contacting leur bracket for connecting a rear derailleur to a the derailleur mounting extension to place the rear bicycle frame, utilizing a coupling portion formed derailleur in a predetermined posture relative to the on a derailleur mounting extension of a rear fork rear fork end. end of the bicycle frame. Where the derailleur has varied specifications io such as a varied shape and operating characteris- DESCRIPTION OF THE RELATED ART tics, the derailleur has a varied suitable assembled posture relative to the bicycle frame for performing Conventionally, where a bicycle has a frame an excellent shifting performance such as by an including a derailleur mounting extension of a rear efficient application to the chain of a chain re- fork end, a rear derailleur bracket is directly con- 75 locating force. Taking this aspect into account, the nected to a coupling portion, such as a cutout present invention provides a bracket which, when portion, formed on the derailleur mounting exten- connected to the derailleur mounting extension, sion. A rear derailleur is attached to the bicycle presents a suitable connecting position to the de- frame through the rear derailleur bracket. railleur to be assembled to the bicycle frame. Con- It was around 1952 when the first example of 20 sequently, the derailleur connected to this bracket bicycle frame structure appeared in which a rear may assume a suitable assembled posture with derailleur was attached directly to the derailleur ease. mounting extension of the rear fork end. From that Moreover, the bracket is attached to the bicy- time to this day, where the bicycle frame includes cle frame in a predetermined posture readily as- the derailleur mounting extension, the derailleur, 25 sured by action of the position setting means. regardless of its specifications, has been regarded Some rear derailleurs may have such configu- as being designed for direct connection to the rations that, when directly connected to the derail- derailleur mounting extension. This direct connec- leur mounting extension of the rear fork end, fail to tion of the rear derailleur has continued as an assume a suitable assembled posture, thereby ex- established practice. 30 hibiting a poor shifting performance. However, by Certain types of rear derailleurs directly con- using the bracket according to the present inven- nected to the rear fork end heretofore are not well tion, such derailleurs may also assume a suitable suited to the bicycle frame configuration. This fails assembled posture to have an enhanced shifting to attain an optimal state of attachment, resulting in performance. a poor shifting performance. When the rear derail- 35 The position setting means allows the bracket leur is attached, its guide wheel is located relatively to be placed in the above predetermined posture far apart in a forward direction of the bicycle from with ease, which facilitates an assembling operation rear gears. To change the chain from one gear to from the point of view of bracket posture setting. another, the guide wheel moves to a lateral position To facilitate manufacture of this bracket, in a relatively remote from the gears. Such a shifting 40 preferred embodiment of the present invention, the operation of the rear derailleur does not achieve bracket body is formed of an approximately L- high efficiency in disengaging and engaging the shaped plate, with the first connecting means and chain. Thus, the rear derailleur has a reduced shift- the second connecting means being in form of ing operability. substantially circular bolt bores. The position set- 45 ting means, which determines a connecting posi- SUMMARY OF THE INVENTION tion of the second connecting means, i.e. a bolt bore, may advantageously be disposed adjacent An object of the present invention is to provide the second connecting means. a technique of attaching a rear derailleur to a Preferably, the position setting means is in bicycle frame having a derailleur mounting exten- 50 form of a projection extending substantially verti- sion defining a coupling portion in a way to assure cally from a surface of the plate forming the brack- excellent chain relocating characteristics and high et body. shifting efficiency, regardless of specifications of Other features and advantages of the invention the rear derailleur. will be apparent from the following description of The above object is fulfilled, according to the 55 the preferred embodiment taken in conjunction with present invention, by a rear derailleur bracket com- the accompanying drawings. prising a bracket body; first connecting means pro- vided adjacent one end of the bracket body for 2 3 EP 0 609 834 A1 4 BRIEF DESCRIPTION OF THE DRAWINGS tension to the chain 101 through the guide wheel 1 and tension wheel 2. The chain guide 3 is con- Fig. 1 is a side view of a rear derailleur at- nected to the support member 4 to be pivotable tached to a bicycle through a rear derailleur brack- about a second axis 92. Thus, the guide wheel 1 et according to the present invention. 5 and tension wheel 2 are pivotable relative to the Fig. 2 is a sectional view of the rear derailleur support member 4 about the second axis 92. A attached to the bicycle through the rear derailleur second tension spring 13 mounted in the support bracket according to the present invention. member 4 as shown in Fig. 2 biases the chain Fig. 3 is a front view of the rear derailleur guide 3 to pivot relative to the support member 4. bracket according to the present invention. io Thus, the guide wheel 1 and tension wheel 2 are Fig. 4 is a side view of the rear derailleur biased to pivot relative to the support member 4, to bracket seen from a direction of A-A in Fig. 3. apply a tension to the chain 101. With this con- Fig. 5 is an explanatory view showing a way in struction, when the guide wheel 1 moves sideways which the rear derailleur bracket is connected to a relative to the bicycle frame to change the chain bicycle frame. is from one gear to another, the support member 4 pivots vertically about the first axis 91, and a por- DETAILED DESCRIPTION OF THE PREFERRED tion of the chain guide 3 supporting the guide EMBODIMENT wheel 1 pivots vertically about the second axis 92. As a result, the guide wheel 1 moves sideways as Fig. 1 shows a rear shifting device of a bicycle 20 well as vertically to a close vicinity of the gears G1- for providing seven speeds. As shown, a bicycle G7 to shift the chain 101 efficiently. The chain 101 frame 50 includes a rear wheel hub having seven is maintained in a predetermined tension whichever rear gears G1-G7 of different diameters. A rear of the gears G1-G7 is engaged by the chain 101. derailleur 100 is attached to the bicycle frame 50 As shown in Fig. 3, the bracket 8 is in the form through a bracket 8. The rear derailleur 100 in- 25 of an approximately L-shaped plate in front view. cludes a chain guide 3 having a guide wheel 1 and The bracket 8 includes a first circular bolt bore 8a a tension wheel 2, a support member 4 for support- disposed adjacent one end thereof, and a second ing the chain guide 3, a bracket member 5, and a circular bolt bore 8b disposed adjacent the other pair of right and left pivot links 6 and 7 for intercon- end. As shown in Fig. 4, the bracket 8 further necting the support member 4 and bracket mem- 30 includes a stepped projection 8c formed on a sur- ber 5.
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