JPS5849902Y2 - handlebar stem - Google Patents
handlebar stemInfo
- Publication number
- JPS5849902Y2 JPS5849902Y2 JP1977165265U JP16526577U JPS5849902Y2 JP S5849902 Y2 JPS5849902 Y2 JP S5849902Y2 JP 1977165265 U JP1977165265 U JP 1977165265U JP 16526577 U JP16526577 U JP 16526577U JP S5849902 Y2 JPS5849902 Y2 JP S5849902Y2
- Authority
- JP
- Japan
- Prior art keywords
- length
- drop
- stem
- support
- bundle
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K21/00—Steering devices
- B62K21/12—Handlebars; Handlebar stems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
Description
【考案の詳細な説明】
本考案は、ステム本体の頂部に、該本体の半径方向外方
に延びる突出体を突設し、該突出体先端に、直杆部と曲
杆部とから成るドロップバンドルの前記直杆部を支持す
るバンドルバー支持部を設けて成心ドロップハンドル用
バントルバーステムの改良に関する。[Detailed Description of the Invention] The present invention includes a protruding body extending radially outward from the top of the stem body, and a drop consisting of a straight rod portion and a curved rod portion at the tip of the protruding body. The present invention relates to an improvement of a bundle bar stem for a centered drop handle by providing a bundle bar support part that supports the straight rod part of the bundle.
この種のバントルバーステムに釦いては、バンドルバー
支持部に設けた軸孔に・・ンドルバーを挿通して、該バ
ンドルバーの長さ方向中央部の直杆部分を前記軸孔内周
面で締付けて支持するようになっているから、支持部の
軸方向長さ、つ１す、軸孔の長さが短いと、十分な支持
強度が得られず、バンドルバーに作用するモーメントに
よって、バンドルバー周面と圧接する軸孔の端縁が摩耗
変形してキシミ音が発生することがある。For this type of bundle bar stem, the bundle bar is inserted into the shaft hole provided in the bundle bar support part, and the straight rod part at the center in the length direction of the bundle bar is aligned with the inner circumferential surface of the shaft hole. Since it is designed to be supported by tightening, if the axial length of the support part, the length of the shaft hole, and the length of the shaft hole are short, sufficient support strength will not be obtained, and the moment acting on the bundle bar will cause the bundle to The edge of the shaft hole that comes into pressure contact with the bar circumferential surface may be worn and deformed, causing a squeaking sound.
従って、強度面からは、支持部の軸方向長さを長く設定
することが望ましいのであるが、軸方向長さが長いと、
バンドルバーを軸孔に挿通する際、バンドルバーの曲杆
部分が軸孔を通過できず、・・ンドルバーの組付けが不
能になるといった問題が生じる。Therefore, from the viewpoint of strength, it is desirable to set the axial length of the support part to be long, but if the axial length is long,
When inserting the bundle bar into the shaft hole, a problem arises in that the curved rod portion of the bundle bar cannot pass through the shaft hole, making it impossible to assemble the bundle bar.
本考案は、このような問題を解決できる・・ンドルバー
ステムを提供するものであって、冒記のバントルバース
テムに釦いて前記支持部の軸方向長さを前記突出体の幅
方向長さより長くすると共に、この支持部における周方
向一部の軸方向長さを短かくして、該この支持部の軸方
向中間部で、前記短寸部分に対向する箇所に、所定長さ
をもった切込みを設ける一方、前記切込みの間隔をＸと
し、前記短寸部分の軸方向長さを１３とし、かつ、前記
支持部の内径をＲとし、前記ドロップ・・ンドルの曲杆
部にむける小径側の曲率半径をｒｌ、大径側の曲率半径
なｒ２としたとき、
となるごとくした点に特徴がある。The present invention provides a buntlebar stem that can solve such problems, and the axial length of the supporting part is made shorter than the widthwise length of the protruding body by pressing a button on the buntlebar stem described above. At the same time, the axial length of a part of the support part in the circumferential direction is shortened, and a cut having a predetermined length is made in the axially intermediate part of the support part at a location opposite to the short part. On the other hand, the interval between the cuts is X, the axial length of the short part is 13, the inner diameter of the support part is R, and the curvature of the small diameter side toward the curved rod part of the drop... When the radius is rl and the radius of curvature on the large diameter side is r2, the feature is as follows.
本考案の実施例を図面に基づいて説明すると、１は、自
転車フレームのヘッドパイプ内に挿入された前ホークの
上部に挿入して、該ホークに固定する中空円筒状のステ
ム本体、２はステム本体１の頂部に、該本体１０半径方
向外方に向けて一体に突設された中空円筒状の突出体で
、該突出体の先端には、直杆部と曲杆部とから成るドロ
ップ・・ンドルＡを挿通するための軸孔３を有するノ・
ンドルバー支持部４が一体に設けられている。An embodiment of the present invention will be described based on the drawings. 1 is a hollow cylindrical stem body that is inserted into the upper part of a front fork inserted into the head pipe of a bicycle frame and fixed to the fork; 2 is a stem body; A hollow cylindrical protrusion is integrally provided on the top of the main body 1 and protrudes outward in the radial direction of the main body 10. At the tip of the protrusion, there is a drop consisting of a straight rod portion and a curved rod portion.・Has a shaft hole 3 for inserting the handle A.・
A handle bar support portion 4 is integrally provided.
この支持部４には、軸孔３の周方向一部を開放する切欠
５ととの切欠５の間隙を縮小することによって軸孔３内
周面でドロップバンドルＡの直杆部を締付は固定するた
めのボルト挿入孔６が設けられている。This support part 4 has a notch 5 that opens a part of the shaft hole 3 in the circumferential direction, and a straight rod part of the drop bundle A can be tightened on the inner peripheral surface of the shaft hole 3 by reducing the gap between the notch 5 and the notch 5. A bolt insertion hole 6 for fixing is provided.
７はボルト、８はナツト９は引上げ棒、１０は引上げウ
スである。7 is a bolt, 8 is a nut, 9 is a pulling rod, and 10 is a pulling screw.
前記突出体２から前記支持部４に移行する両者２．４の
連結部ａば、支持部４側に至る程、軸方向両側面間の距
離が大きくなるようなテーパー状に形成され、支持部４
の軸方向長さ１１は、突出体２０幅方向長さ１２より長
くすると共に、この支持部４の連結部ａ側にむける軸孔
３の長さ１３を、前記長さ１１よりも短かく、かつ、前
記突出体２０幅方向長さ１２よりも長い寸法とし、かつ
、この支持部４の軸方向中間部で、前記短寸部分に対向
する箇所に所定長さをもった切込み１１を設けるのであ
る。The connecting portion a between the protruding body 2 and the supporting portion 4 is formed in a tapered shape such that the distance between both sides in the axial direction increases as it approaches the supporting portion 4. 4
The axial length 11 of is longer than the widthwise length 12 of the protrusion 20, and the length 13 of the shaft hole 3 facing the connecting part a side of the support part 4 is shorter than the length 11, Moreover, the dimension is longer than the length 12 in the width direction of the protrusion 20, and a notch 11 having a predetermined length is provided at the axially intermediate portion of the support portion 4 at a location opposite to the short portion. be.
そして、前記切込み１１の長さ、即ち切込み１１０間隔
は、該切込み１１０間隔をＸとし、前記支持部４の内径
をＲとし、前記ドロップバンドルＡの曲杆部における小
径側の曲率半径をｒｌ、大径側の曲率半径をｒ２とした
とき、となるごとく構成するのである。The length of the notches 11, that is, the interval between the notches 110, is as follows: X is the interval between the notches 110, R is the inner diameter of the support portion 4, and rl is the radius of curvature on the small diameter side of the curved rod portion of the drop bundle A. When the radius of curvature on the large diameter side is r2, it is constructed as follows.
即ち、ドロップバンドルＡの曲杆部の中心点Ｏから、前
記短寸部分１３の中点ｏ１１での長さは、Ｏから、切込
み１１の間隔Ｘの中点ｏｚｌでの長側面と軸孔３の内周
面との間隔Ｈ１は、
また、前記曲杆部の外側面と軸孔３の内周面との間隔Ｈ
２は、
これにより、支持部４の内径Ｒは、
この式を展開することにより前記した間隔Ｘはの式を導
き出せるのである。That is, the length from the center point O of the curved rod part of the drop bundle A to the midpoint o11 of the short portion 13 is the length from O to the long side at the midpoint ozl of the interval X of the notch 11 and the shaft hole 3. The distance H1 between the inner circumferential surface of the curved rod portion and the inner circumferential surface of the shaft hole 3 is
2. Accordingly, by expanding this equation, the equation for the inner diameter R of the support portion 4 and the above-mentioned distance X can be derived.
上記の構成によれば、支持部４の軸方向長さ１１が長い
ため、支持強度が向上し、それでいて、ドロップバンド
ルＡの曲杆部分を挿入する際には、該曲杆部分にむける
曲り部の外面側が切込み１１内に逃げて軸孔３内周面に
相当する位置よりも外方に突出し、曲り部の内面側が軸
孔３内局面の延長上位置よりも外方に突出するため、ド
ロップバンドルＡの曲杆部分な軸孔３に挿入して通過さ
せることができる。According to the above configuration, since the axial length 11 of the support portion 4 is long, the support strength is improved, and when inserting the curved rod portion of the drop bundle A, the bent portion toward the curved rod portion is The outer surface side of the curve escapes into the notch 11 and protrudes outward beyond the position corresponding to the inner circumferential surface of the shaft hole 3, and the inner surface side of the curved portion protrudes outward beyond the position on the extension of the inner circumferential surface of the shaft hole 3, resulting in a drop. It can be inserted into and passed through the shaft hole 3 which is a curved rod portion of the bundle A.
伺、前記ナツト８は、第７図に示すように、円柱体Ｘを
、互いに平行で、かつ、前記円柱体Ｘの軸線に対して傾
斜した平面Ｙ１．Ｙ２により切断し、これら各平面Ｙｌ
、Ｙ２と円柱体Ｘ外周面とのなす鋭角側の角部な、互い
に平行で、かつ、前記軸線に対して垂直又は略垂直な平
面Ｚ１ｔＺ２により切断して得られるような形状を有す
るもので、前記ボルト７の内端側を螺合する雌ねじ８ａ
は、前者平面Ｙ１ 、Ｙ２に対して垂直な方向に穿孔さ
れている。As shown in FIG. 7, the nut 8 moves the cylindrical body X into a plane Y1. which is parallel to each other and inclined with respect to the axis of the cylindrical body X. cut by Y2, and each of these planes Yl
, Y2 and the outer circumferential surface of the cylindrical body Female thread 8a screwed into the inner end of the bolt 7
are perforated in a direction perpendicular to the former planes Y1 and Y2.
而して、上記ナツト８は、第３図で示したように、ドロ
ップバンドルＡ外面と突出体２の内面と当て付けた状態
に配置されボルト７の締付により該ナツトにてドロップ
バンドルを押付ける力が作用し強固に固定できるもので
ある。As shown in FIG. 3, the nut 8 is placed in contact with the outer surface of the drop bundle A and the inner surface of the protruding body 2, and when the bolt 7 is tightened, the nut pushes the drop bundle. It is something that can be firmly fixed by the force applied to it.
又以上の実施例では、突出体２と支持部４との連結部ａ
の軸方向長さを短寸として、この連結部ａに対向する箇
所に切込み１１を設けたが、前記連結部ａを短寸にする
以外、支持部４に釦ける周方向なら特に限定しない。Further, in the above embodiment, the connecting portion a between the protruding body 2 and the supporting portion 4
Although the notch 11 is provided at a location opposite to the connecting part a by making the axial length of the cutout short, there is no particular limitation in the circumferential direction in which the support part 4 is buttoned, except that the connecting part a is shortened.
また切込み１１として第２，３図に示したごとく支持４
の肉厚全体を欠如させる他、外周面を残して内周面のみ
切取るごとくしてもよい。In addition, as shown in FIGS. 2 and 3, the notch 11 is a support 4.
In addition to cutting off the entire wall thickness, it is also possible to cut only the inner peripheral surface while leaving the outer peripheral surface.
以上のように、本考案は、ステム本体頂部の突出体に設
けた・・ンドルバー支持部の軸方向長さを、前記突出体
の幅方向長さよりも長くすると共に、この支持部におけ
る周方向一部に短寸部分を設けて、前記支持部の軸方向
中間部で、短寸部分に対向する箇所に所定長さをもった
切込みを設ける一方、前記切込みの間隔をＸとし、前記
短寸部分の軸方向長さを１３とし、かつ、前記支持部の
内径をＲとし、前記ドロップノ・ンドルの曲杆部におけ
る小径側の曲率半径をｒｌ、大径側の曲率半径をｒｌと
したとき、
となるごとくしたから、支持部に形成されている軸孔に
対するドロップハンドル曲杆部分の挿通な支承なく行な
えるのであり、これによって、支持部の軸方向長さ、つ
１す、ドロップハンドルの直杆部分を挿通支持する軸長
の長さを十分に長く設定して、ドロップハンドルの支持
強度を向上し得るに至ったのである。As described above, the present invention makes the length in the axial direction of the dowel bar support part provided on the protrusion at the top of the stem body longer than the length in the width direction of the protrusion, and also makes the length in the circumferential direction of this support part longer. A short portion is provided in the support portion, and a cut having a predetermined length is provided at a location opposite to the short portion in the axially intermediate portion of the support portion, and an interval between the cuts is set as X, and the short portion is When the axial length of is 13, the inner diameter of the support part is R, the radius of curvature on the small diameter side of the curved rod part of the drop nodule is rl, and the radius of curvature on the large diameter side is rl, As a result, the drop handle curved rod part can be inserted into the shaft hole formed in the support part without having to be supported. By setting the shaft length through which the rod portion is inserted and supported to be sufficiently long, it has become possible to improve the support strength of the drop handle.
【図面の簡単な説明】
図面は本考案の実施態様を例示し、第１図は・・ンドル
バーステムの斜視図、第２図は要部の平面図、第３図は
第２図の■−■線断面図、第４図は第２図のＩＶ−ＩＶ
線断面図、第５図は第２図のＶＶ線断面図、第６図は第
２図のＶＩ−ＶＩ線断面図、第７図はナツトの形状を示
す側面図である。
１・・・・・・ステム本体、２・・・・・・突出体、４
・・・・・・支持部、ａ・・・・・・連結部、Ａ・・・
・・・ハンドルバー。[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings illustrate the embodiment of the present invention, in which Fig. 1 is a perspective view of the steering wheel stem, Fig. 2 is a plan view of the main parts, and Fig. 3 is the same as shown in Fig. 2. - ■ cross-sectional view, Figure 4 is IV-IV in Figure 2
5 is a sectional view taken along the line VV in FIG. 2, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 2, and FIG. 7 is a side view showing the shape of the nut. 1...Stem body, 2...Protrusion body, 4
...Supporting part, a...Connecting part, A...
...Handlebar.
Claims (1)
体を突設し、該突出体先端に、直杆部と曲杆部とから成
るドロツプノ・ンドルの前記直杆部を支持するバンドル
バー支持部を設けたドロップバンドル用バントルバース
テムにおいて、前記支持部の軸方向長さを前記突出体の
幅方向長さより長くすると共に、この支持部に釦ける周
方向一部の軸方向長さを短かくして、該この支持部の軸
方向中間部で、前記短寸部分に対向する箇所に、所定長
さをもった切込みを設ける一方、前記切込みの間隔なＸ
とし、前記短寸部分の軸方向長さを１３とし、かつ、前
記支持部の内径をＲとし、前記ドロップ・・ンドルの曲
杆部における小径側の曲率半径をｒｌ、大径側の曲率半
径をｒ２としたとき、となるごとくしたことを特徴とす
るバントルバーステム。A bundle bar having a protrusion projecting from the top of the stem body and extending outward in the radial direction of the stem body, and supporting the straight rod part of the drop-no-endle consisting of a straight rod part and a curved rod part at the tip of the protrusion body. In a bantle bar stem for a drop bundle provided with a support part, the axial length of the support part is longer than the width direction length of the protrusion, and the axial length of a part of the circumferential direction buttoned to this support part is made shorter. A notch having a predetermined length is provided in the axially intermediate portion of the support portion at a location opposite to the short portion, while the interval between the notches is
The axial length of the short portion is 13, the inner diameter of the support portion is R, the radius of curvature on the small diameter side of the curved rod portion of the drop handle is rl, and the radius of curvature on the large diameter side is A bantlebar stem characterized by the following when r2 is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977165265U JPS5849902Y2 (en) | 1977-12-08 | 1977-12-08 | handlebar stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977165265U JPS5849902Y2 (en) | 1977-12-08 | 1977-12-08 | handlebar stem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5489755U JPS5489755U (en) | 1979-06-25 |
| JPS5849902Y2 true JPS5849902Y2 (en) | 1983-11-14 |
Family
ID=29163499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977165265U Expired JPS5849902Y2 (en) | 1977-12-08 | 1977-12-08 | handlebar stem |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5849902Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5348292A (en) * | 1976-10-14 | 1978-05-01 | Sakae Ringiyou Kk | Method of manufacturing handle stem |
-
1977
- 1977-12-08 JP JP1977165265U patent/JPS5849902Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5348292A (en) * | 1976-10-14 | 1978-05-01 | Sakae Ringiyou Kk | Method of manufacturing handle stem |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5489755U (en) | 1979-06-25 |
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