JPH0322070Y2 - - Google Patents

Description

【考案の詳細な説明】 （産業上の利用分野） 本考案は自転車用フロントデイレーラーに関す
る。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a bicycle front derailleur.

（従来の技術） 一般に、此種フロントデイレーラーは、実公昭
57−39271号公報に記載されている通り、自転車
におけるフレームのシートチユーブに固定する固
定部材に一対のリンク部材を一対の枢支軸で連結
し、これらリンク部材に一対の枢支軸でチエンガ
イドをもつた可動部材を連結する一方、前記固定
部材に、前記リンク部材の揺動範囲を調整する一
対のアジヤストボルトを設けると共に、前記リン
ク部材の１つに前記アジヤストボルトと当接する
一対の当接部を設けて、一方のアジヤストボルト
と一方の当接部との当接により前記リンク部材の
揺動方向一方側への揺動範囲を規制し、また、他
方のアジヤストボルトと他方の当接部との当接に
より前記リンク部材の揺動方向他方側への揺動範
囲を規制する如く構成されている。(Prior art) Generally, this type of front derailleur is
As described in Publication No. 57-39271, a pair of link members are connected by a pair of pivot shafts to a fixed member fixed to the seat tube of a bicycle frame, and a chain guide is attached to these link members by a pair of pivot shafts. The fixed member is provided with a pair of adjustment bolts for adjusting the swing range of the link member, and one of the link members is provided with a pair of adjustment bolts that abut the adjustment bolt. A contact portion is provided, and the swing range of the link member in the swing direction is restricted by the contact between one adjusting bolt and the one contact portion, and the swing range of the link member to one side in the swing direction is restricted. The swinging range of the link member to the other side in the swinging direction is restricted by contact with the contacting portion of the link member.

（考案が解決しようとする問題点） 所が、以上の如く構成されたフロントデイレー
ラーにおける前記アジヤストボルトの先端部及び
当接部は、隠蔽されることなく外部に露出してい
るため、車輪の回転により跳ね飛ばされた泥土
が、前記アジヤストボルトと前記当接部との当接
部分に付着して泥詰りとなり、その結果、アジヤ
ストボルトによる調整が適正であつても、前記リ
ンク部材の揺動範囲が狂い、変速性が悪くなる問
題があつた。(Problem to be Solved by the Invention) However, in the front derailleur configured as described above, the tips and contact portions of the adjustment bolts are not hidden and are exposed to the outside, The mud thrown off by the rotation of the link member adheres to the contact portion between the adjusting bolt and the contact portion, resulting in mud clogging, and as a result, even if the adjusting bolt is properly adjusted, the link member There was a problem that the oscillation range was out of order and the shifting performance became poor.

本考案の目的は、特別の隠蔽部材を用いること
なく、前記アジヤストボルトと当接部との当接部
分を隠蔽できるようにするものである。 An object of the present invention is to make it possible to hide the contact portion between the adjustment bolt and the contact portion without using a special concealment member.

（問題点を解決するための手段） しかして、本考案は固定部材２に一対のリンク
部材５，６を一対の枢支軸３，４で連結し、これ
らリンク部材５，６に一対の枢支軸７，８でチエ
ンガイド９をもつた可動部材１０を連結すると共
に、前記固定部材２又は前記可動部材１０と、前
記リンク部材５又は６との一方に、前記リンク部
材５，６の揺動範囲を調整する一対のアジヤスト
ボルト１２，１３を設け、他方に、これらアジヤ
ストボルト１２，１３と当接する当接部１４，１
５を設けて成るフロントデイレーラーにおいて、
前記アジヤストボルト１２，１３を設ける一方の
部材における枢支軸周りに、前記リンク部材の揺
動中心線と同方向に延び、前記当接部１４，１５
を設ける他方の部材に対向する対向面に開口する
空洞５１を設けて、前記アジヤストボルト１２，
１３の先端部を前記空洞５１内に臨ませると共
に、前記当接部１４，１５を設ける他方の部材
に、前記空洞５１内に突入し、かつ、前記空洞５
１内で相対回転可能な受体２１を設け、この受体
２１に前記当接部１４，１５を設けたものであ
る。(Means for Solving the Problems) Accordingly, the present invention connects a pair of link members 5 and 6 to a fixed member 2 with a pair of pivot shafts 3 and 4, and connects a pair of link members 5 and 6 to a pair of pivot shafts 3 and 4. A movable member 10 having a chain guide 9 is connected by the support shafts 7 and 8, and a swinging member of the link members 5 and 6 is attached to one of the fixed member 2 or the movable member 10 and the link member 5 or 6. A pair of adjuster bolts 12 and 13 are provided to adjust the range of motion, and the other is provided with abutting portions 14 and 1 that come into contact with these adjuster bolts 12 and 13.
In the front derailleur provided with 5,
The abutting portions 14, 15 extend in the same direction as the swing center line of the link member around the pivot shaft of one of the members on which the adjusting bolts 12, 13 are provided.
The adjusting bolt 12,
13 facing into the cavity 51, the other member provided with the abutting parts 14 and 15 protrudes into the cavity 51, and the cavity 5
A receiving body 21 that is relatively rotatable within the receiving body 1 is provided, and the abutting portions 14 and 15 are provided on this receiving body 21.

（作 用） 前記リンク部材５，６の固定部材２との連結
時、又は、前記可動部材１０のリンク部材５，６
との連結時、受体２１を空洞５１内に差込むこと
により、この空洞５１の開放口を、前記受体２１
を設けた部材の、前記アジヤストボルト１２，１
３を設けた部材との対向面によつて閉鎖し得るの
で、アジヤストボルト１２，１３と当接部１４，
１５との当接部分を隠蔽することができるのであ
る。(Function) When the link members 5 and 6 are connected to the fixed member 2, or when the link members 5 and 6 of the movable member 10 are connected,
By inserting the receptor 21 into the cavity 51, the opening of the cavity 51 is connected to the receptor 21.
The adjusting bolt 12, 1 of the member provided with
3, the adjustment bolts 12, 13 and the contact portion 14,
15 can be hidden.

（実施例） 図示したフロントデイレーラーは、自転車のシ
ートチユーブに締付バンド１を介して固定する固
定部材２と、該固定部材２に一対の枢支軸３，４
で連結する一対の第１及び第１リンク部材５，６
及びこれらリンク部材５，６の遊端部に一対の枢
支軸７，８で連結するチエンガイド９をもつた可
動部材１０とから成るリンク機構Ａを備え、前記
第２リンク部材６と可動部材１０との間にリター
ンばね１１を介装して前記チエンガイド９を多段
フロントギヤの小径ギヤ側に付勢する一方、前記
第１リンク部材５に、該第１リンク部材５及び前
記第２リンク部材６の揺動範囲を調整する一対の
アジヤストボルト１２，１３を設けると共に、前
記固定部材２に、前記アジヤストボルト１２，１
３と当接する一対の当接部１４，１５を前記第１
リンク部材５の揺動方向に所定間隔を置いて設
け、前記アジヤストボルト１２，１３の調節によ
り前記第１リンク部材５の揺動範囲、ひいては前
記チエンガイド９の揺動範囲を規制するようにし
ている。(Embodiment) The illustrated front derailleur includes a fixing member 2 that is fixed to the seat tube of a bicycle via a tightening band 1, and a pair of pivot shafts 3 and 4 attached to the fixing member 2.
a pair of first and first link members 5, 6 connected by
and a movable member 10 having a chain guide 9 connected to the free ends of the link members 5, 6 by a pair of pivot shafts 7, 8, the second link member 6 and the movable member A return spring 11 is interposed between the first link member 5 and the second link to bias the chain guide 9 toward the small diameter gear of the multi-stage front gear. A pair of adjusting bolts 12 and 13 are provided for adjusting the swing range of the member 6, and the adjusting bolts 12 and 13 are provided on the fixed member 2.
The pair of contact portions 14 and 15 that contact the first
They are provided at a predetermined interval in the swinging direction of the link member 5, and the swinging range of the first link member 5 and, by extension, the swinging range of the chain guide 9 is regulated by adjusting the adjusting bolts 12 and 13. ing.

又、前記第１リンク部材５の基端部に、操作ワ
イヤと該ワイヤを案内するアウター筒とから成る
操作索における前記ワイヤを支持する支持部１６
ａをもつた支持腕１６を一体に設けて、前記ワイ
ヤの牽引操作により前記リンク機構Ａを変形させ
て、前記チエンガイド９を多段フロントギヤの軸
方向で、大径ギヤ側に往動させ、また、前記ワイ
ヤの弛緩操作により前記チエンガイドを、前記リ
ターンばね１１の復元力で小径ギヤ側に復動させ
るようにしている。。 Further, at the proximal end of the first link member 5, there is provided a support portion 16 for supporting the wire in the operating cable consisting of an operating wire and an outer tube for guiding the wire.
A support arm 16 having a diameter A is integrally provided, and the link mechanism A is deformed by pulling the wire to move the chain guide 9 forward in the axial direction of the multi-stage front gear toward the large diameter gear, Further, by loosening the wire, the chain guide is moved back toward the small diameter gear by the restoring force of the return spring 11. .

しかして、第１〜第５図に示した実施例では、
前記アジヤストボルト１２，１３を設ける第１リ
ンク部材５における基端部の枢支軸３周りに、前
記第１リンク部材５の揺動中心線と同方向に延
び、前記当接部１４，１５を設ける固定部材２に
対向する対向面５ａに開口する空洞５１を設け
て、前記アジヤストボルト１２，１３の先端部を
前記空洞５１内に臨ませると共に、前記当接部１
４，１５を設ける固定部材２に、前記空洞５１内
に突入し、かつ、前記空洞５１内で相対回転可能
な受体２１を設け、この受体２１に前記当接部１
４，１５を設けたのである。 However, in the embodiments shown in FIGS. 1 to 5,
The abutting portions 14, 15 extend in the same direction as the swing center line of the first link member 5 around the pivot shaft 3 at the proximal end of the first link member 5 on which the adjuster bolts 12, 13 are provided. A cavity 51 is provided that opens on the opposing surface 5a facing the fixing member 2 provided with the fixing member 2, so that the tips of the adjusting bolts 12 and 13 are faced into the cavity 51, and the abutment part 1
4 and 15 is provided with a receiver 21 that protrudes into the cavity 51 and is relatively rotatable within the cavity 51, and the receiver 21 is provided with the contact portion 1.
4,15 were established.

以上の構成において、前記空洞５１は、前記第
１リンク部材５の成形時、例えば第１図の如く断
面半円形に成形するのであつて、この空洞５１の
平担面部分に一対のねじ孔５２，５３を開口さ
せ、これらねじ孔５２，５３に螺合する前記アジ
ヤストボルト１２，１３の先端部を前記空洞５１
内に臨ませるのである。又、前記ねじ孔５２，５
３は、前記枢支軸３を中心として前記リンク部材
５の長さ方向に振分けている。 In the above configuration, when the first link member 5 is molded, the cavity 51 is formed to have a semicircular cross section as shown in FIG. , 53 are opened, and the tips of the adjusting bolts 12, 13 that are screwed into these screw holes 52, 53 are inserted into the cavity 51
Let it come within. Moreover, the screw holes 52, 5
3 is distributed in the length direction of the link member 5 with the pivot shaft 3 as the center.

又、前記空洞５１の開放口は、前記第１リンク
部材５を固定部材２に連結したとき、前記固定部
材２の表面２ａによつて閉鎖されるのであるが、
好ましくは、第２図の如くリング状のシール材１
７を設けて、前記空洞５１における開放口の閉鎖
性を高める如く成すのが好ましい。尚、前記シー
ル材１７は、合成樹脂から成り、その内周面に、
前記対向面５ａ及び表面２ａとの間で軽く挾持す
る複数個の舌片１７ａを設けている。 Further, the opening of the cavity 51 is closed by the surface 2a of the fixing member 2 when the first link member 5 is connected to the fixing member 2.
Preferably, a ring-shaped sealing material 1 as shown in FIG.
7 is preferably provided to improve the closure of the opening in the cavity 51. Note that the sealing material 17 is made of synthetic resin, and has the following on its inner circumferential surface:
A plurality of tongue pieces 17a are provided which are lightly held between the opposing surface 5a and the surface 2a.

又、前記受体２１及び当接部１４，１５は、前
記固定部材２の成形時、一体に成形するのであ
る。尚、前記受体２１は別に形成して、前記固定
部材２に固定してもよい。 Furthermore, the receiver 21 and the contact portions 14 and 15 are integrally molded when the fixing member 2 is molded. Note that the receiver 21 may be formed separately and fixed to the fixing member 2.

又、前記枢支軸３，４は、その基端を前記固定
部材２にカシメ加工により固定し、遊端部を連結
体１８で相互に連結している。 Further, the pivot shafts 3 and 4 have their base ends fixed to the fixing member 2 by caulking, and their free ends are interconnected by a connecting body 18.

尚、図中１９，２０，３０はゴム製のＯリング
である。 In addition, 19, 20, and 30 in the figure are rubber O-rings.

本考案は以上の如く構成するもので、第１リン
ク部材５を枢支軸３で固定部材２に連結すると
き、固定部材２に設けた受体２１を、前記第１リ
ンク部材５に設けた空洞５１内に差込むことによ
り、前記第１リンク部材５に設けたアジヤストボ
ルト１２，１３の先端部を、前記受体２１に設け
た当接部１４，１５に対向させることができるの
であり、又、前記空洞５１の開放口を、前記固定
受体２の表面２ａによつて閉鎖することができる
のである。従つて、前記アジヤストボルト１２，
１３と当接部１４，１５との当接部分を、特別の
隠蔽部材を設けなくとも隠蔽することができるの
である。 The present invention is constructed as described above, and when the first link member 5 is connected to the fixed member 2 by the pivot shaft 3, the receiver 21 provided on the fixed member 2 is provided on the first link member 5. By inserting them into the cavity 51, the tips of the adjusting bolts 12, 13 provided on the first link member 5 can be opposed to the contact portions 14, 15 provided on the receiver 21. Furthermore, the opening of the cavity 51 can be closed by the surface 2a of the fixed receiver 2. Therefore, the adjusting bolt 12,
The contact portion between the contact portion 13 and the contact portions 14 and 15 can be hidden without providing a special concealment member.

尚、以上説明した実施例では、第１リンク部材
５にアジヤストボルト１２，１３を設け、固定部
材２に当接部１４，１５を設けたが、その反対に
設けてもよい。又、前記第２リンク部材６と固定
部材２との一方に前記アジヤストボルト１２，１
３を設け、他方に前記当接部１４，１５を設けて
もよいし、又、前記可動部材１０と、前記リンク
部材５又は６との一方に前記アジヤストボルト１
２，１３を設け、他方に前記当接部１４，１５を
設けてもよいのである。 In the embodiment described above, the adjusting bolts 12, 13 are provided on the first link member 5, and the contact portions 14, 15 are provided on the fixed member 2, but they may be provided in the opposite manner. Further, the adjusting bolts 12, 1 are attached to one of the second link member 6 and the fixing member 2.
3, and the abutting parts 14, 15 may be provided on the other, or the adjusting bolt 1 may be provided on one of the movable member 10 and the link member 5 or 6.
2 and 13 may be provided, and the contact portions 14 and 15 may be provided on the other.

（考案の効果） 以上の如く本考案は、リンク部材５，６の揺動
範囲を調整する一対のアジヤストボルト１２，１
３を設ける一方の部材における枢支軸周りに、前
記リンク部材の揺動中心線と同方向に延び、当接
部１４，１５を設ける他方の部材に対向する対向
面に開口する空洞５１を設けて、前記アジヤスト
ボルト１２，１３の先端部を前記空洞５１内に臨
ませると共に、前記当接部１４，１５を設ける他
方の部材に、前記空洞５１内に突入し、かつ、前
記空洞５１内で相対回転可能な受体２１を設け、
この受体２１に前記当接部１４，１５を設けたか
ら、前記リンク部材５，６の固定部材２との連結
時、又は、可動部材１０の前記リンク部材５，６
との連結時、前記受体２１を空洞５１内に差込む
だけの非常に簡単な操作で、前記アジヤストボル
ト１２，１３の先端部を前記当接部１４，１５に
対向させることができて、しかも、前記空洞５１
の開放口を、前記受体２１を設けた部材によつて
閉鎖することができるので、前記アジヤストボル
ト１２，１３と当接部１４，１５との当接部分に
泥が詰るのを防ぐことができ、泥詰りによる変速
性の悪化をなくすることができるのである。(Effect of the invention) As described above, the invention provides a pair of adjuster bolts 12 and 1 for adjusting the swing range of the link members 5 and 6.
3, a cavity 51 is provided around the pivot axis in one of the members, which extends in the same direction as the center line of swing of the link member, and which opens on the opposing surface facing the other member, in which the abutting portions 14 and 15 are provided. Then, the tips of the adjusting bolts 12 and 13 are made to face the inside of the cavity 51, and the other member provided with the contact portions 14 and 15 is inserted into the cavity 51 and is inserted into the cavity 51. A receiver 21 that is relatively rotatable is provided,
Since the contact parts 14 and 15 are provided on the receiver 21, when the link members 5 and 6 are connected to the fixed member 2, or when the link members 5 and 6 of the movable member 10 are connected,
When connecting with, the tips of the adjusting bolts 12, 13 can be opposed to the contact parts 14, 15 by a very simple operation of just inserting the receiver 21 into the cavity 51. , and the cavity 51
Since the opening of the opening can be closed by the member provided with the receiver 21, it is possible to prevent mud from clogging the abutting portions between the adjusting bolts 12, 13 and the abutting portions 14, 15. This makes it possible to eliminate deterioration in shifting performance due to mud clogging.

しかも、特別の隠蔽部材が不要であるから、構
造を簡単にでき、それだけ泥詰りを防止できる割
りに加工及び組立性を良好にでき、コストを安く
できるのである。 Furthermore, since no special concealing member is required, the structure can be simplified, and while mud clogging can be prevented, processing and assembly can be improved, and costs can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案フロントデイレーラーの一実施
例を示す要部のみの拡大正面図、第２図は同じく
拡大平面図、第３図は全体の側面図、第４図は同
正面図、第５図は同平面図である。 ２……固定部材、３，４，７，８……枢支軸、
５，６……リンク部材、９……チエンガイド、１
０……可動部材、１２，１３……アジヤストボル
ト、１４，１５……当接部、２１……受体、５１
……空洞。 Fig. 1 is an enlarged front view of only the main parts showing one embodiment of the front derailleur of the present invention, Fig. 2 is an enlarged plan view, Fig. 3 is a side view of the whole, Fig. 4 is a front view of the same, and Fig. 4 is an enlarged front view of only the main parts. FIG. 5 is a plan view of the same. 2... Fixed member, 3, 4, 7, 8... Pivot shaft,
5, 6... Link member, 9... Chain guide, 1
0... Movable member, 12, 13... Adjustment bolt, 14, 15... Contact portion, 21... Receiver, 51
……cavity.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 固定部材２に一対のリンク部材５，６を一対の
枢支軸３，４で連結し、これらリンク部材５，６
に一対の枢支軸７，８でチエンガイド９をもつた
可動部材１０を連結すると共に、前記固定部材２
又は前記可動部材１０と、前記リンク部材５又は
６との一方に、前記リンク部材５，６の揺動範囲
を調整する一対のアジヤストボルト１２，１３を
設け、他方に、これらアジヤストボルト１２，１
３と当接する当接部１４，１５を設けて成るフロ
ントデイレーラーにおいて、前記アジヤストボル
ト１２，１３を設ける一方の部材における枢支軸
周りに、前記リンク部材の揺動中心線と同方向に
延び、前記当接部１４，１５を設ける他方の部材
に対向する対向面に開口する空洞５１を設けて、
前記アジヤストボルト１２，１３の先端部を前記
空洞５１内に臨ませると共に、前記当接部１４，
１５を設ける他方の部材に、前記空洞５１内に突
入し、かつ、前記空洞５１内で相対回転可能な受
体２１を設け、この受体２１に前記当接部１４，
１５を設けたことを特徴とする自転車用フロント
デイレーラー。 A pair of link members 5 and 6 are connected to the fixed member 2 by a pair of pivot shafts 3 and 4, and these link members 5 and 6
A movable member 10 having a chain guide 9 is connected to the fixed member 2 by a pair of pivot shafts 7 and 8.
Alternatively, one of the movable member 10 and the link member 5 or 6 is provided with a pair of adjusting bolts 12 and 13 for adjusting the swing range of the link members 5 and 6, and the adjusting bolt 12 is provided on the other side. ,1
3, the adjusting bolts 12, 13 are arranged around the pivot shaft of one of the members, in the same direction as the center line of swing of the link member. A cavity 51 is provided that extends and opens on the opposing surface facing the other member in which the abutting portions 14 and 15 are provided,
The tips of the adjusting bolts 12 and 13 are made to face into the cavity 51, and the contact portions 14,
15 is provided with a receiver 21 that protrudes into the cavity 51 and is relatively rotatable within the cavity 51, and the contact portion 14,
A bicycle front derailleur characterized by having 15 parts.